Details about "Intestinal staplers" - principle, diagram or images, description of all parts, technique of application, indications, complications and other necessary details

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Intestinal Staplers - Complete Surgical Reference

Historical Background

The surgical stapler for bowel surgery was created in 1908 by Hungarian surgeon Humer Hultl and instrument designer Victor Fischer. Soviet surgeons refined the technology in the 1950s, developing the first circular anastomotic stapler and first reusable devices. US surgeon Mark Ravitch brought this technology from Russia and, with colleague Felicien Steichen, developed the modern instruments in use today. Commercial production in the US followed in the 1960s-70s with interchangeable and disposable cartridges.

Basic Principle

All intestinal staplers operate on the same fundamental mechanism:

A two-piece system (two jaws or a detachable anvil) clamps the tissue between them
One jaw carries a reloadable staple cartridge; the opposing jaw (anvil) shapes the staple
On firing, an I-beam or sliding driver mechanism pushes rows of staples through the tissue
The staple legs pass through the tissue and bend against the anvil, deforming into a "B" shape - this is the key to hemostatic closure while still allowing tissue perfusion

The "B" shape is critical: it is neither too tight (which would cause ischemia/necrosis) nor too loose (which would cause bleeding or leak). Staple formation pressure is measured in microns.

"B" Shape of a Properly Formed Surgical Staple:

B-shape of properly formed surgical staples

Figure: The "B" configuration allows hemostasis while preserving tissue viability. (Fischer's Mastery of Surgery)

Types of Intestinal Staplers

The three main categories used in intestinal surgery are:

1. Linear Cutting Stapler (GIA - Gastrointestinal Anastomosis)

Principle: Fires two or more rows of staggered staples on each side of a central cutting blade simultaneously - divides AND seals tissue in one motion.

Parts:

Part	Description
Handle	Ergonomic grip; houses the firing mechanism
Shaft	Connects handle to the jaws
I-beam/Driver	The firing mechanism; advances forward pushing staple drivers upward and carrying the blade
Staple cartridge (lower jaw)	Loaded with 2-3 rows of staples in staggered configuration; color-coded by height
Anvil (upper jaw)	Fixed opposing jaw; contains the forming pockets that shape staples into "B"
Knife/blade	Central blade housed within the cartridge that cuts between staple rows
Safety mechanism	Prevents accidental firing
Articulating head	Present in laparoscopic versions; allows angulation for positioning

Staple cartridge color-coding:

White (2.5 mm open height, closed ~1 mm): vascular tissue, mesentery
Blue (3.8 mm): standard for small bowel and colon
Green (4.8 mm): thick tissue (stomach, thickened bowel)

Common sizes: 60, 75, 80 mm jaw lengths. Laparoscopic versions: Endo-GIA (Covidien/Medtronic), Echelon (Ethicon).

2. Linear Non-Cutting Stapler (TA - Thoracoabdominal / Proximate TL)

Principle: Fires rows of staples but has NO cutting blade - staples tissue closed without dividing it. Division is accomplished separately (manually with a scalpel or scissors).

Parts: Similar to GIA but lacks the central cutting mechanism. Has a pin at the distal end that must be engaged prior to firing to prevent tissue from being pushed out. The handle is often at a 90-degree angle to the shaft for better deep pelvic access.

Sizes: 30-90 mm staple lines available, with matching staple height cartridges.

3. Circular (EEA - End-to-End Anastomosis) Stapler

This is a two-piece detachable system specifically designed for end-to-end luminal anastomosis with simultaneous resection of an inner ring of tissue.

Circular stapler device - full instrument and head detail

Figure: A - EEA circular stapler (curved shaft, handle, anvil at tip). B - Close-up of the stapler head showing the circular double rows of staples arranged around the central cutting ring. (Fischer's Mastery of Surgery)

Parts of the EEA:

Part	Description
Handle	Housing for the firing and approximation mechanism
Shaft	May be straight or curved (for transanal insertion)
Staple head/cartridge	Circular arrangement of 2 rows of staples on the body of the device
Anvil	Detachable mushroom-shaped disc with a central spike; sutured into the proximal bowel with a purse-string suture
Center rod/pin	Telescoping pin that connects body to anvil; extends when turning the knob to "open" position
Approximation knob	Turning knob that advances or retracts the pin to mate with/separate from the anvil
Tissue gap indicator	Green/red indicator shows whether tissue compression is in the correct range
Firing trigger/handle squeeze	Deploys the staples and the circular knife simultaneously
Circular knife	Cuts the tissue inner to the double staple rings, creating the anastomotic lumen

Available diameters: 21, 25, 28, 29, 31, 33 mm (note: the resultant inner lumen is up to 10 mm smaller than the device diameter due to the staple ring width)

4. Curved Cutting Stapler (Contour Stapler, Ethicon)

A specialized TA-style device with a slightly curved/bent cartridge to allow better access in the deep pelvis. It fires staples AND cuts in one motion (like GIA), but is shaped for pelvic applications. Has a distal end pin to prevent tissue slippage on firing.

Diagrams and Images

Enterotomy on the antimesenteric side (preparation for side-to-side anastomosis):

Figure 4.1: Enterotomy created on the antimesenteric side, exposing the mesenteric fat between the two bowel limbs. (Hinman's Atlas of Urologic Surgery / Steichen, Stapling Techniques)

GIA stapler being fired across tissue:

Figure 4.2: The opposing limbs of a GIA stapler placed within the bowel lumens, closed and fired along the antimesenteric border. (Hinman's Atlas / Steichen)

TA stapler closing the common enterotomy below Allis clamps:

Figure 4.3: A TA stapler or additional GIA load used to close the common enterotomy. (Hinman's Atlas / Steichen)

EEA pin advanced through the rectal stump (colorectal anastomosis):

EEA pin through rectal stump with anvil in colon

Figure 4.4: EEA stapler inserted transanally into the rectal stump; pin advanced to "open" position; anvil (already purse-string secured in proximal colon) connected to the pin. (Hinman's Atlas / Steichen)

EEA firing sequence - complete colorectal anastomosis (A-E):

EEA complete colorectal anastomosis steps A-E

Figure: A - Anvil sutured with purse-string into proximal colon; rectal stump with TA staple line below. B - EEA device introduced transanally, arrow shows direction. C - Pin extended and mated with anvil, approximating both ends. D - Instrument fired (staples + cut in cross-section). E - Final intact colorectal anastomosis. (Fischer's Mastery of Surgery, adapted from ASCRS Manual)

EEA stapler mated and closed in the pelvis:

EEA mechanism closed in pelvis (A and B views)

Figure 4.5 (A, B): Mechanism closed by turning the knob; cross-sectional view shows both ends of bowel approximated. (Hinman's Atlas / Steichen)

Techniques of Application

A. Side-to-Side (Functional End-to-End) Anastomosis - GIA Stapler

Used for ileocolic, small bowel-to-bowel, or entero-enteric anastomoses.

Resect the bowel segment using GIA stapler to divide proximal and distal margins
Create an enterotomy on the two stapled ends - either by cutting a corner of the staple line, or making a small stab on the antimesenteric side ~1 cm from the staple line
Insert one jaw of the GIA stapler into each lumen; align the two bowel limbs along the antimesenteric border
Confirm no mesentery is trapped in the jaws
Close the jaws and fire - the driver is pushed to the end of its track and back to deploy staples and divide tissue
Open and remove the stapler; inspect the internal staple line for hemostasis
Place a crotch stitch at the apex of the common channel to reduce tension at this high-stress point
Approximate the open enterotomy with Allis clamps, offsetting the two staple lines (avoids a single thick suture line)
Close the common enterotomy with a second GIA load or a TA stapler fired below the clamps
Optionally reinforce with interrupted Lembert sutures; close mesentery per preference

B. End-to-End (Double-Staple) Colorectal Anastomosis - EEA Stapler

Used for low anterior resection, coloanal, or ileoanal anastomoses.

Resect the bowel; fire a TA stapler across the rectum (distal margin)
Open the proximal colon end; place the EEA anvil into it and secure with a full-thickness purse-string suture (hand-sewn or using a purse-string device)
Insert the EEA handle/body transanally through the rectum and advance to the top of the rectal stump
Turn the knob to "open" position - the center pin telescopes out through or beside the TA staple line of the rectal stump
Mate the pin to the anvil shaft
Turn the knob to "closed" position - this draws the two ends of bowel together; confirm the tissue indicator is in the green (optimal compression) zone
Ensure no other bowel loops or tissue are caught in the mechanism
Fire the instrument - this simultaneously deploys two circular rows of staples and cuts an inner ring of tissue
Withdraw the device; inspect the two "donuts" (circular tissue specimens) which should both be complete - incomplete donuts indicate a defective anastomosis
Leak test: rigid or flexible sigmoidoscopy with air/saline insufflation to confirm airtight seal
Consider diverting loop ileostomy if: positive leak test, prior radiation, malnutrition, steroid use, very low pelvic anastomosis, or technically difficult case

C. Bowel Resection and Closure (TA Stapler)

Place the TA stapler across the bowel at the desired resection point, ensuring the pin at the distal end is engaged
Fire the stapler to close the bowel
Divide the bowel manually (scalpel) just beyond the staple line
The staple line is typically 30-90 mm in length; multiple applications may be needed for larger structures

Indications

Procedure	Stapler Type Used
Right hemicolectomy with ileocolic anastomosis	GIA (side-to-side) + TA or GIA (closure)
Low anterior resection (LAR)	TA (rectal transection) + EEA (colorectal anastomosis)
Ileal pouch-anal anastomosis (IPAA / J-pouch)	GIA (pouch formation) + 25 mm EEA (anastomosis)
Total colectomy with ileorectal anastomosis	GIA / EEA
Hartmann's reversal	EEA
Small bowel resection / anastomosis	GIA (side-to-side)
STEP procedure (serial transverse enteroplasty)	Linear GIA applied from alternating directions
Gastric sleeve / bypass (bariatric)	GIA (stomach division/anastomosis)
Esophagojejunostomy	25 mm EEA
Recto-sigmoid resection	EEA (25-29 mm)
Meckel's diverticulum excision	GIA across the base
Whipple / hepatobiliary resection	GIA for parenchymal and vascular transection

A key advantage over hand-sewn anastomosis: stapled ileocolic anastomosis after right hemicolectomy has been shown to have a significantly lower leak rate compared to hand-sewn technique. (Goulder 2012, cited in Hinman's Atlas)

Complications

Anastomotic Leak

The most feared complication. Causes include:

Inadequate blood supply to the anastomosis
Tension on the anastomosis
Incomplete donuts after EEA firing (defective staple line)
Misfired or partially fired stapler
Wrong tissue thickness for cartridge height selected
Infection, malnutrition, immunosuppression, radiation

Prevention: ensure good blood supply, no tension, check donuts, perform intraoperative leak test, consider diverting stoma in high-risk cases.

Staple Line Bleeding

Can be intraluminal (causing GI bleeding) or extraluminal (intra-abdominal hematoma)
Risk increases if wrong staple height used for tissue thickness (too small = incomplete closure; too large = inadequate compression)
Treatment: oversewing, clips, fibrin glue application to the staple line

Anastomotic Stricture

Circular stapler anastomoses are prone to stricture, especially with smaller diameter devices
Related to ischemia, excessive fibrosis, or oversewing
The resultant inner lumen of an EEA anastomosis is already up to 10 mm smaller than device diameter

Misfire / Device Malfunction

Failure to deploy all staples (incomplete staple line)
Knife failure (staples fired but tissue not cut)
Cartridge fired without tissue (inadvertent firing)
Incomplete donut retrieval

Tissue Inclusion Errors

Mesentery caught in the staple line (GIA) - compromises bowel viability
Adjacent bowel loops caught in EEA closure mechanism
Vaginal wall or ureter incorporated (rare but serious)

Bowel Obstruction

Early: due to hematoma, edema at anastomosis
Late: anastomotic stricture, adhesions around the staple line

Staple Line Reinforcement (SLR)

Several adjuncts exist to reduce bleeding and leak rates:

Absorbable synthetic buttress (glycolide or trimethylene carbonate copolymer matrices)
Biologic buttress (porcine small intestinal submucosa)
Oversewing the staple line with absorbable sutures
Fibrin glue / tissue sealants

Note: Evidence on SLR is mixed - some data shows reduced bleeding but no clear benefit (and possibly increased leak rates) when used routinely. Most commonly employed in sleeve gastrectomy. (Fischer's Mastery of Surgery)

Key Technical Pearls

Always select the appropriate staple height for the tissue thickness - this is one of the most common sources of error
For the GIA: offset the staple lines when closing the common enterotomy to avoid a bulk junction point
For the EEA: both donuts must be complete; an incomplete donut mandates direct inspection and reinforcement sutures
Always perform an intraoperative leak test (air/saline via flexible or rigid scope) for distal colorectal anastomoses
Laparoscopic/robotic versions (Endo-GIA, Echelon, articulating models) use identical principles but are fired through trocars; articulation assists with deep pelvic or complex angle applications
Powered staplers are now available and may improve consistency of the firing mechanism
Never reuse a single-use cartridge; ensure the safety mechanism is off before firing

Comparison: Stapled vs. Hand-Sewn Anastomosis

Feature	Stapled	Hand-Sewn
Speed	Faster	Slower
Consistency	More uniform	Operator-dependent
Ileocolic leak rate	Lower (RCT data)	Higher
Colorectal (LAR)	Equivalent outcomes	Technically harder deep in pelvis
Anastomotic stricture	Higher (EEA)	Lower
Cost	Higher (disposable cartridges)	Lower
Deep pelvic anastomosis	Excellent (EEA)	Very difficult

Sources:

Hinman's Atlas of Urologic Surgery, Chapter: Intestinal Division and Anastomosis (pp. 55-58) - Cone MM, Geiger TM
Sabiston Textbook of Surgery (21st ed.), Chapter: Surgical Staplers
Fischer's Mastery of Surgery (8th ed.), Chapters: Surgical Staplers; Stapler Buttress Materials; Gastrointestinal Leak

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ls -la /home/daytona/workspace/ 2>/dev/null || echo "workspace does not exist"

Running Command

mkdir -p /home/daytona/workspace/intestinal-staplers && echo "Directory created"

Writing File

~/intestinal-staplers/generate_pdf.py

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import subprocess
import base64
import os
from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.units import cm, mm
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY
from reportlab.platypus import (
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)
from reportlab.platypus.flowables import HRFlowable
from reportlab.lib.colors import HexColor
from io import BytesIO

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        "Intestinal division and anastomosis was transformed by surgical stapling devices over the past 100 years. "
        "The first surgical stapler for bowel surgery was created in <b>1908</b> by Hungarian surgeon Humer Hultl and "
        "instrument designer Victor Fischer. After modifications in the 1920s, Soviet surgeons refined the technology "
        "in the 1940s-50s, developing the first circular anastomotic stapler and first reusable devices. "
        "US surgeon Mark Ravitch brought the technology from Russia, and with colleague Felicien Steichen developed "
        "the modern instruments in clinical use today. Commercial production in the US followed in the 1960s-70s "
        "with interchangeable and disposable cartridges of various staple heights.", body))
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        "The stapled anastomosis is best known for its ability to significantly decrease operative time and its "
        "consistent reproducible results. For elective intestinal surgery, a stapled anastomosis shows equivalent "
        "or superior outcomes compared to hand-sewn technique. Stapled ileocolic anastomosis after right "
        "hemicolectomy has a significantly <b>lower leak rate</b> than hand-sutured anastomosis (Goulder 2012).", body))

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        "All intestinal staplers share the same fundamental mechanism:", body))
    steps = [
        "A <b>two-piece system</b> (two jaws or a detachable anvil) clamps the tissue between them under controlled compression.",
        "One jaw carries a <b>reloadable staple cartridge</b>; the opposing jaw (anvil) has forming pockets that shape the staple legs.",
        "On firing, an <b>I-beam/driver mechanism</b> pushes rows of staples through the tissue; the legs pass through and bend against the anvil pockets.",
        "Each staple deforms into a <b>\"B\" shape</b> — the hallmark of correct formation. This allows hemostatic closure while preserving tissue perfusion (neither over-compressed causing ischemia, nor under-compressed causing bleeding).",
        "Staple formation pressure is critical; manufacturing tolerances on cartridges and anvils are measured in <b>microns</b>.",
        "Staplers with a cutting blade simultaneously <b>divide AND seal</b> tissue in one motion.",
    ]
    for s in steps:
        story.append(Paragraph(f"<bullet>&bull;</bullet> {s}", bullet))

    story.append(Spacer(1, 0.3*cm))
    story.append(Paragraph(
        '<b>The "B" Shape of a Properly Formed Staple</b>', h3))
    story.append(Paragraph(
        'The staple leg is pushed through tissue and bends against the anvil forming pocket to produce a '
        '"B" profile. This shape compresses but does not strangulate tissue, maintaining microvascular integrity '
        'at the anastomotic edge.', body))

    # B-shape image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/1a5fcaae75945af0452bdbe30cf700f898b990dc0d155505092e531cb8cdc0ea.png",
        5,
        'Figure 1. "B" shape of a properly formed surgical staple. (Fischer\'s Mastery of Surgery, 8th ed.)'
    ))

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 3: TYPES OF STAPLERS
    # ══════════════════════════════════════════════════════════════════════════
    story.append(Spacer(1, 0.3*cm))
    story.append(Paragraph("3. Types of Intestinal Staplers", h1))
    story.append(section_rule())

    # Overview comparison table
    story.append(Paragraph("3.1  Overview Comparison", h2))
    overview_data = [
        ["Stapler Type", "Also Known As", "Cuts?", "Staple Rows", "Primary Use"],
        ["Linear Cutting", "GIA (Gastrointestinal Anastomosis)\nEndo-GIA / Echelon (laparoscopic)",
         "Yes", "2x2 or 2x3 rows\n(each side of blade)", "Bowel division, side-to-side anastomosis"],
        ["Linear Non-Cutting", "TA (ThoracoAbdominal)\nProximate TL",
         "No", "2 rows", "Close bowel without dividing; pelvic transection"],
        ["Circular Cutting", "EEA (End-to-End Anastomosis)\nCDH/ILS",
         "Yes", "2 circular rows", "End-to-end luminal anastomosis (colorectal, esophageal)"],
        ["Curved Cutting", "Contour Stapler (Ethicon)",
         "Yes", "Multiple rows", "Deep pelvic resection; combines TA access with cutting"],
    ]
    ov_col = [W*0.2, W*0.28, W*0.08, W*0.2, W*0.24]
    ov_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(overview_data)],
        colWidths=ov_col, repeatRows=1)
    ov_table.setStyle(std_table_style())
    story.append(ov_table)
    story.append(Spacer(1, 0.4*cm))

    # ── 3.2 GIA ─────────────────────────────────────────────────────────────
    story.append(Paragraph("3.2  Linear Cutting Stapler (GIA)", h2))
    story.append(Paragraph(
        "The GIA is the most commonly used intestinal stapling device. It fires two pairs of staggered staple rows "
        "on each side of a central cutting blade, simultaneously dividing and sealing tissue in a single motion. "
        "Common brands: <b>GIA</b> (Covidien/Medtronic), <b>Proximate Linear Cutter</b> (Ethicon). "
        "Laparoscopic versions: <b>Endo-GIA</b> (Medtronic), <b>Echelon</b> (Ethicon).", body))

    story.append(Paragraph("<b>Parts of the GIA Stapler:</b>", h3))
    gia_parts = [
        ["Part", "Description"],
        ["Handle", "Ergonomic grip housing the firing mechanism; may be powered in newer models"],
        ["Shaft", "Connects handle to jaws; articulating in laparoscopic versions for angulation"],
        ["I-beam / Driver", "The firing mechanism; advances forward pushing staple drivers upward and carrying the blade through the full jaw length"],
        ["Staple Cartridge\n(lower jaw)", "Contains 2-3 staggered rows of titanium staples; color-coded by staple height (White/Blue/Green); single-use, reloadable"],
        ["Anvil (upper jaw)", "Fixed opposing jaw with forming pockets (recesses) that shape the staple legs into the 'B' configuration"],
        ["Knife / Blade", "Central cutting blade housed within the cartridge channel; cuts between the two sets of staple rows simultaneously with staple firing"],
        ["Safety lock", "Prevents accidental premature firing; must be disengaged before firing"],
        ["Jaw closure knob/lever", "Closes and locks the jaws onto tissue before firing; ensures uniform tissue compression"],
        ["Articulating head\n(laparoscopic)", "Allows the jaw assembly to angle for optimal tissue alignment through a trocar"],
    ]
    gia_col = [W*0.28, W*0.72]
    gia_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(gia_parts)],
        colWidths=gia_col, repeatRows=1)
    gia_table.setStyle(std_table_style())
    story.append(gia_table)
    story.append(Spacer(1, 0.3*cm))

    story.append(Paragraph("<b>Staple Cartridge Color-Coding (GIA / Linear staplers):</b>", h3))
    cc_data = [
        ["Color", "Open Staple Height", "Closed Height", "Tissue Application"],
        ["White", "2.5 mm", "~1 mm", "Vascular tissue, mesentery, thin structures"],
        ["Blue", "3.8 mm", "~1.5 mm", "Standard: small bowel, colon, normal tissue"],
        ["Green", "4.8 mm", "~2 mm", "Thick tissue: stomach, thickened/oedematous bowel"],
        ["Purple/Black\n(tri-staple)", "Varies", "Variable", "Specialty thick-tissue applications (bariatric)"],
    ]
    cc_col = [W*0.12, W*0.2, W*0.18, W*0.5]
    cc_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13, backColor=(
                                            HexColor("#f0f0f0") if (r>0 and cell=="White") else
                                            HexColor("#dbe9f8") if (r>0 and cell=="Blue") else
                                            HexColor("#c8e6c9") if (r>0 and cell=="Green") else
                                            colors.white
                                          ))) for cell in row]
         for r, row in enumerate(cc_data)],
        colWidths=cc_col, repeatRows=1)
    cc_table.setStyle(std_table_style())
    story.append(cc_table)
    story.append(Spacer(1, 0.3*cm))

    # GIA application figure
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/46664fddf6b35723c4b4f01f821bafc59a6cfbc7aa96d1a7f517a4bf02ac453c.png",
        7,
        "Figure 2. GIA stapler jaws placed within bowel lumens and fired along the antimesenteric border "
        "to create a side-to-side anastomosis. (Hinman's Atlas / Steichen, Stapling Techniques)"
    ))

    # ── 3.3 TA ──────────────────────────────────────────────────────────────
    story.append(Spacer(1, 0.2*cm))
    story.append(Paragraph("3.3  Linear Non-Cutting Stapler (TA / Proximate TL)", h2))
    story.append(Paragraph(
        "The TA stapler fires rows of staples without a cutting blade. Division is accomplished separately "
        "(scalpel or scissors after firing). The handle is typically set at a <b>90-degree angle</b> to the shaft "
        "for deep pelvic access. A <b>distal pin</b> must be engaged before firing to prevent tissue from "
        "being pushed out during staple deployment. Available staple line lengths: 30-90 mm.", body))

    # ── 3.4 EEA ─────────────────────────────────────────────────────────────
    story.append(Paragraph("3.4  Circular Cutting Stapler (EEA)", h2))
    story.append(Paragraph(
        "The EEA is a two-piece detachable system for <b>end-to-end luminal anastomosis</b> with simultaneous "
        "circular tissue resection. It is inserted through the rectum (transanally) for colorectal anastomoses. "
        "Available diameters: <b>21, 25, 28, 29, 31, 33 mm</b> (note: the resultant inner anastomotic lumen "
        "is up to 10 mm smaller than device diameter).", body))

    story.append(Paragraph("<b>Parts of the EEA Stapler:</b>", h3))
    eea_parts = [
        ["Part", "Description"],
        ["Handle", "Housing for the firing trigger and approximation mechanism; ergonomic grip"],
        ["Shaft", "Straight or curved (for transanal insertion); connects handle to staple head"],
        ["Staple head /\nCartridge body", "Carries 2 circular rows of titanium staples arranged concentrically around the central cutting ring"],
        ["Anvil", "Detachable mushroom-shaped disc; has a central spike/post that mates with the pin; sutured into proximal bowel with a full-thickness purse-string suture"],
        ["Center rod / Pin", "Telescoping pin that connects the stapler body to the anvil; advances by turning the knob to 'open' position; retracts to close"],
        ["Approximation knob", "Rotary knob at the handle end; turning brings the two bowel ends together ('closes'); opposite direction separates them"],
        ["Tissue gap indicator", "Green/amber/red marker on shaft; confirms adequate tissue compression is achieved before firing (prevents under- or over-compression)"],
        ["Firing trigger /\nHandle squeeze", "Fires the device; simultaneously deploys both circular staple rows AND the circular knife in one motion"],
        ["Circular knife", "Cuts the tissue inner to the double staple rings, creating the anastomotic lumen; the cut tissue pieces ('donuts') remain on the device after removal"],
    ]
    eea_col = [W*0.28, W*0.72]
    eea_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(eea_parts)],
        colWidths=eea_col, repeatRows=1)
    eea_table.setStyle(std_table_style())
    story.append(eea_table)
    story.append(Spacer(1, 0.3*cm))

    # EEA image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/9816924805485e229f07ae4e432b8368020d45158e8c6f31ec3148d1799389b5.png",
        10,
        "Figure 3. Circular (EEA) stapler. A: Full device showing curved shaft, handle and anvil head. "
        "B: Close-up of the stapler head showing the two concentric circular staple rows and central cutting ring. "
        "(Fischer's Mastery of Surgery, 8th ed.)"
    ))

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 4: TECHNIQUE OF APPLICATION
    # ══════════════════════════════════════════════════════════════════════════
    story.append(PageBreak())
    story.append(Paragraph("4. Technique of Application", h1))
    story.append(section_rule())

    # 4.1 Side-to-side
    story.append(Paragraph("4.1  Side-to-Side (Functional End-to-End) Anastomosis — GIA Stapler", h2))
    story.append(Paragraph(
        "Most commonly used for ileocolic, small bowel-to-bowel, or entero-enteric anastomoses "
        "during right hemicolectomy, small bowel resection, and colonic resections.", body))

    sts_steps = [
        ["Step", "Action", "Key Points"],
        ["1", "Bowel resection", "Use GIA stapler to divide the proximal and distal bowel margins; this closes and divides both ends simultaneously"],
        ["2", "Create enterotomies", "Cut a corner off each stapled end OR make a small stab on the antimesenteric side ~1 cm from the staple line (Fig. 4.1)"],
        ["3", "Position GIA limbs", "Insert one jaw of the GIA stapler into each bowel lumen; align the two limbs along the antimesenteric border"],
        ["4", "Confirm no mesentery", "Before closing, verify no mesenteric fat is trapped between the jaws — mesentery in the staple line risks ischemia"],
        ["5", "Close and fire", "Close the jaws firmly; push the driver to the end of its track and back — deploys all staples and divides tissue"],
        ["6", "Inspect staple line", "Open and remove stapler; directly inspect internal anastomotic staple line for active bleeding; oversew any bleeders"],
        ["7", "Crotch stitch", "Place a figure-of-eight or interrupted suture at the apex of the common channel — this 'crotch stitch' reduces tension at the highest-stress point"],
        ["8", "Close enterotomy", "Approximate the open ends with Allis clamps, OFFSETTING the two staple lines; fire another GIA load or a TA stapler below the clamps"],
        ["9", "Reinforce (optional)", "The staple line can be reinforced with interrupted Lembert sutures; close mesentery per surgeon preference"],
    ]
    sts_col = [W*0.06, W*0.22, W*0.72]
    sts_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(sts_steps)],
        colWidths=sts_col, repeatRows=1)
    sts_table.setStyle(std_table_style())
    story.append(sts_table)
    story.append(Spacer(1, 0.3*cm))

    # Enterotomy image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/509e9e5a440954e0c92ee0d63e24ca630c48f4342dcfa103ca2012ccd00a1dbf.png",
        6,
        "Figure 4. Enterotomy on the antimesenteric side — created between the mesenteric border (yellow fat) "
        "and the two bowel limbs to allow GIA jaw insertion. (Hinman's Atlas / Steichen, Stapling Techniques)"
    ))

    # Common enterotomy closure image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/21574b9563e6dd9d9c32ad6893695376a294922169cf4033bc31ded91ca0e992.png",
        7,
        "Figure 5. TA stapler (or second GIA load) closing the common enterotomy below Allis clamps "
        "with offset staple lines. (Hinman's Atlas / Steichen)"
    ))

    # 4.2 EEA colorectal
    story.append(Spacer(1, 0.3*cm))
    story.append(Paragraph("4.2  End-to-End (Double-Staple) Colorectal Anastomosis — EEA Stapler", h2))
    story.append(Paragraph(
        "Used for low anterior resection (LAR), sigmoidectomy, ileal pouch-anal anastomosis (IPAA), "
        "and Hartmann's reversal. The double-staple technique involves a TA-stapled rectal stump "
        "and an EEA-created end-to-end anastomosis.", body))

    eea_steps = [
        ["Step", "Action", "Key Points"],
        ["1", "Bowel resection", "Resect the affected bowel; fire a TA stapler across the rectum for the distal margin — creates the rectal stump"],
        ["2", "Prepare anvil", "Open the proximal colon end; place the EEA anvil into it; secure with a full-thickness purse-string suture (hand-sewn or purse-string device)"],
        ["3", "Insert EEA body", "Insert the EEA handle/body transanally through the rectum; advance to the top of the rectal stump"],
        ["4", "Extend pin", "Turn the knob to 'open' position — the center pin telescopes out; it should exit directly through or just beside the TA staple line of the distal stump (Fig. 4.4)"],
        ["5", "Mate anvil to pin", "Connect the anvil shaft spike to the center pin of the stapler body"],
        ["6", "Approximate & check", "Turn the knob to 'closed' — draws both ends of bowel together; confirm the tissue gap indicator is in the GREEN (optimal compression) zone; ensure NO adjacent bowel/organs are trapped"],
        ["7", "Fire", "Fire the instrument — simultaneously deploys two circular rows of staples AND the circular knife; creates the anastomosis"],
        ["8", "Check donuts", "Withdraw the device; inspect both circular 'donuts' of tissue — BOTH must be COMPLETE rings; an incomplete donut = defective anastomosis requiring repair or revision"],
        ["9", "Leak test", "Perform rigid or flexible sigmoidoscopy with air/saline insufflation — confirms anastomosis is airtight before closure"],
        ["10", "Diverting stoma?", "Consider loop ileostomy if: positive leak test, prior pelvic radiation, malnutrition, steroid use, technically difficult anatomy, or very low pelvic anastomosis"],
    ]
    eea_s_col = [W*0.06, W*0.22, W*0.72]
    eea_s_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(eea_steps)],
        colWidths=eea_s_col, repeatRows=1)
    eea_s_table.setStyle(std_table_style())
    story.append(eea_s_table)
    story.append(Spacer(1, 0.3*cm))

    # EEA sequence image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/21737096409961b35aa58bf32bc874c2dc383c91d106f43430ddb57dec9600f7.png",
        W/cm,
        "Figure 6. EEA colorectal anastomosis sequence. A: Anvil sutured with purse-string into proximal colon; "
        "stapled rectal stump below. B: EEA device introduced transanally. C: Pin extended and mated with anvil. "
        "D: Cross-section at moment of firing — staples and cut shown. E: Final intact colorectal anastomosis. "
        "(Fischer's Mastery of Surgery, adapted from ASCRS Manual of Colon and Rectal Surgery)"
    ))

    # EEA detail image
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/d943981fc44af2406bff8cca757b866e668a5f52769815aa96e4d4c8f8e94428.png",
        12,
        "Figure 7. EEA pin advanced through the rectal stump in the pelvic cavity. The pin connects to the anvil "
        "already secured with purse-string in the proximal colon (right side). (Hinman's Atlas / Steichen)"
    ))

    # EEA closed mechanism
    story.extend(make_img(
        "https://cdn.orris.care/cdss_images/08338bf6c32c1ce3e8dd48b07c5555962cd30802d93e706c849999712894fc78.png",
        9,
        "Figure 8 (A, B). EEA mechanism closed by turning the knob — the two bowel ends are approximated "
        "ready for firing. Pelvic anatomy shown with bladder (blue oval) above. (Hinman's Atlas / Steichen)"
    ))

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 5: INDICATIONS
    # ══════════════════════════════════════════════════════════════════════════
    story.append(PageBreak())
    story.append(Paragraph("5. Indications", h1))
    story.append(section_rule())

    ind_data = [
        ["Procedure", "Stapler Used", "Key Details"],
        ["Right hemicolectomy\nwith ileocolic anastomosis",
         "GIA (anastomosis)\n+ TA or GIA (enterotomy closure)",
         "Lower anastomotic leak rate vs. hand-sewn (Goulder 2012)"],
        ["Left hemicolectomy /\nSigmoidectomy",
         "GIA or TA (bowel division)\n+ EEA 28-29 mm",
         "EEA for anastomosis; TA for distal margin closure"],
        ["Low anterior resection (LAR)",
         "TA (rectal transection)\n+ EEA 28-33 mm",
         "EEA fired transanally; requires intraoperative leak test"],
        ["Ultra-low anterior resection",
         "TA + EEA 25-28 mm",
         "High technical difficulty; diverting ileostomy often required"],
        ["Ileal pouch-anal anastomosis\n(IPAA / J-pouch)",
         "GIA (J-pouch construction)\n+ EEA 25 mm",
         "25 mm EEA for ileoanal anastomosis; protective loop ileostomy standard"],
        ["Hartmann's reversal",
         "EEA (colorectal re-anastomosis)",
         "Transanal EEA to rejoin sigmoid to rectal stump"],
        ["Small bowel resection",
         "GIA (side-to-side)\n+ GIA or TA (closure)",
         "Functional end-to-end; widely used for ileocolic and jejunoileal anastomoses"],
        ["STEP procedure\n(Serial Transverse Enteroplasty)",
         "Linear GIA",
         "Applied from alternating directions along the mesenteric border to lengthen bowel in short gut syndrome"],
        ["Gastrectomy /\nGastric bypass (Roux-en-Y)",
         "GIA (gastric division, anastomosis)\nEEA for esophagojejunostomy",
         "Green cartridge for thick gastric tissue; linear stapler for Billroth II reconstruction"],
        ["Sleeve gastrectomy",
         "GIA (green/blue cartridges)",
         "Multiple sequential firings along greater curvature; staple line reinforcement often used"],
        ["Esophagojejunostomy",
         "EEA 25-28 mm",
         "EEA fired via gastrotomy or transoral; high leak risk — careful technique essential"],
        ["Whipple / HPB surgery",
         "GIA (pancreatic/hepatic\nparenchymal transection)",
         "White cartridge for vessels/ducts; staple line reinforcement with biologic material"],
        ["Meckel's diverticulum excision",
         "GIA across the base",
         "Linear fire across diverticular base; avoids narrowing the ileal lumen"],
        ["Colostomy / ileostomy creation\nand closure",
         "GIA or TA",
         "TA for bowel closure; GIA for re-anastomosis during reversal"],
    ]
    ind_col = [W*0.30, W*0.28, W*0.42]
    ind_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(ind_data)],
        colWidths=ind_col, repeatRows=1)
    ind_table.setStyle(std_table_style())
    story.append(ind_table)

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 6: COMPLICATIONS
    # ══════════════════════════════════════════════════════════════════════════
    story.append(PageBreak())
    story.append(Paragraph("6. Complications", h1))
    story.append(section_rule())

    comp_data = [
        ["Complication", "Mechanism / Cause", "Prevention / Management"],
        ["Anastomotic leak\n(most feared)", 
         "Inadequate blood supply; tension; incomplete donuts (EEA); wrong staple height; misfired device; infection, malnutrition, radiation, steroids",
         "Ensure tension-free, well-vascularised anastomosis; check donuts; perform leak test; diverting stoma in high-risk cases; re-exploration if clinical leak develops"],
        ["Staple line bleeding\n(intraluminal or extraluminal)",
         "Wrong staple height (too small = incomplete closure); inadequate tissue compression; staple misfire; missed vessel in cartridge",
         "Correct cartridge selection; oversew bleeding points intraoperatively; fibrin glue; clips to extraluminal bleeding; endoscopy and haemostasis for intraluminal post-op bleeding"],
        ["Anastomotic stricture",
         "Ischaemia; excessive fibrosis; oversewing; inherent lumen reduction with EEA (up to 10 mm smaller than device diameter)",
         "Appropriate device diameter selection; avoid ischaemia; endoscopic balloon dilation for symptomatic stricture post-operatively"],
        ["Device misfire /\nmalfunction",
         "Incomplete staple deployment; knife failure (staples fired but tissue not cut); cartridge fired without tissue; cartridge reuse",
         "Check safety mechanism; correct jaw closure; single-use cartridges only; inspect the cartridge before and after firing; have backup cartridges available"],
        ["Tissue inclusion errors",
         "Mesentery caught in GIA jaws (risks ischaemia); adjacent bowel in EEA closure; ureter or vaginal wall incorporated",
         "Visual confirmation before closing jaws; sweep mesentery clear; ensure correct anatomy identification especially in EEA pelvic use"],
        ["Bowel obstruction",
         "Early: haematoma/oedema at anastomosis; Late: anastomotic stricture, adhesions around staple line",
         "Adequate haemostasis; correct staple height; follow up with endoscopy if obstruction suspected post-operatively"],
        ["Incomplete donuts\n(EEA specific)",
         "Defective purse-string placement; anvil not fully seated; excessive tissue thickness; partial misfire",
         "Both donuts must be inspected after every EEA firing; incomplete donut = reinspect anastomosis and add reinforcement sutures; consider revision"],
        ["Missed ischaemia /\ntension",
         "Over-reliance on stapler without verifying blood supply or tension",
         "Confirm pink bowel edges, visible mesenteric pulsations, and no tension after firing; re-resect if doubtful"],
        ["Wound infection /\nport-site seeding",
         "Contamination during anastomosis; bowel contents spillage; inadvertent firing",
         "Bowel preparation; prophylactic antibiotics; careful technique; specimen bag use laparoscopically"],
    ]
    comp_col = [W*0.22, W*0.36, W*0.42]
    comp_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(comp_data)],
        colWidths=comp_col, repeatRows=1)
    comp_table.setStyle(std_table_style())
    story.append(comp_table)
    story.append(Spacer(1, 0.5*cm))

    # ── Staple line reinforcement box
    story.append(Paragraph("6.1  Staple Line Reinforcement (SLR)", h2))
    story.append(Paragraph(
        "Several adjuncts exist to reduce bleeding and leak rates. They are applied to the stapler cartridge "
        "before firing or to the staple line after firing:", body))
    slr_data = [
        ["Reinforcement Type", "Material", "Evidence"],
        ["Absorbable synthetic buttress", "Glycolide or trimethylene carbonate copolymer matrix; sold by stapler manufacturers (Seamguard, etc.)", "Reduces post-op bleeding; mixed data on leak prevention; possibly increased leak in some series"],
        ["Biologic buttress", "Porcine small intestinal submucosa (SIS); bovine pericardium", "Theoretical benefit; widely used in bariatric surgery"],
        ["Oversewing", "Running or interrupted absorbable sutures over the staple line", "Common in colorectal and bariatric surgery; adds time but provides reinforcement layer"],
        ["Fibrin glue / tissue sealant", "Topical fibrin-based sealants applied to staple line", "Adjunct only; not a substitute for correct technique"],
    ]
    slr_col = [W*0.22, W*0.42, W*0.36]
    slr_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(slr_data)],
        colWidths=slr_col, repeatRows=1)
    slr_table.setStyle(std_table_style())
    story.append(slr_table)

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 7: STAPLED vs HAND-SEWN
    # ══════════════════════════════════════════════════════════════════════════
    story.append(PageBreak())
    story.append(Paragraph("7. Stapled vs. Hand-Sewn Anastomosis", h1))
    story.append(section_rule())

    comp2_data = [
        ["Feature", "Stapled", "Hand-Sewn"],
        ["Operative speed", "Faster (significant time savings)", "Slower"],
        ["Consistency", "More uniform; less operator-dependent", "Highly operator-dependent"],
        ["Ileocolic leak rate", "Lower (RCT data: Goulder 2012)", "Higher"],
        ["Colorectal anastomosis", "Equivalent outcomes; preferred for low pelvic access", "Very difficult deep in pelvis"],
        ["Anastomotic stricture", "Higher incidence (especially EEA)", "Lower incidence"],
        ["Deep pelvic access", "Excellent with EEA transanal technique", "Extremely difficult / near impossible"],
        ["Cost", "Higher (disposable cartridges)", "Lower (sutures only)"],
        ["Esophageal anastomosis", "EEA preferred for ease and consistency", "Alternative; higher technical demand"],
        ["Emergency / ischaemia", "Stapler may still be used but judgment critical", "Preferred when tissue quality uncertain"],
        ["Learning curve", "Shorter for standard procedures", "Longer; requires suturing proficiency"],
    ]
    comp2_col = [W*0.28, W*0.36, W*0.36]
    comp2_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(comp2_data)],
        colWidths=comp2_col, repeatRows=1)
    comp2_table.setStyle(std_table_style())
    story.append(comp2_table)

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 8: TECHNICAL PEARLS
    # ══════════════════════════════════════════════════════════════════════════
    story.append(Spacer(1, 0.4*cm))
    story.append(Paragraph("8. Technical Pearls &amp; Key Points", h1))
    story.append(section_rule())

    pearls = [
        "<b>Cartridge selection is the most common source of error</b> — always match staple height to tissue thickness; incorrect height leads to either ischaemia (too small) or inadequate haemostasis/leakage (too large).",
        "<b>Offset the staple lines</b> when closing the common enterotomy (side-to-side anastomosis) — prevents a bulky single-point junction.",
        "<b>Both donuts must be complete</b> after every EEA firing — an incomplete donut is a mandatory indication to inspect and reinforce the anastomosis.",
        "<b>Always perform a leak test</b> for distal colorectal anastomoses — air/saline via flexible or rigid sigmoidoscopy; a positive test must be addressed before closure.",
        "<b>No mesentery in the GIA jaws</b> — mesentery incorporation leads to ischaemia of the anastomosis.",
        "<b>Bowel orientation for EEA</b> — ensure the proximal bowel does NOT rotate during approximation (knob closure); rotation creates a twisted anastomosis.",
        "<b>Powered staplers</b> (motorised handle) are now available and may improve firing consistency across variable tissue thicknesses.",
        "<b>Laparoscopic/robotic versions</b> (Endo-GIA, Echelon, robotic linear stapler) use identical principles but are delivered through trocars; articulation assists with deep pelvic or complex-angle applications.",
        "<b>Single-use cartridges only</b> — never reuse a cartridge; ensure the safety mechanism is disengaged before firing.",
        "<b>Diverting stoma</b> decision is individualised — mandatory if leak test is positive and cannot be repaired; strongly consider in radiated pelvis, malnutrition, immunosuppression, or technical difficulty.",
        "<b>Inspect the cartridge</b> after removal — confirms all staples were deployed; missing staples in the used cartridge indicate a misfire.",
    ]
    for p in pearls:
        story.append(Paragraph(f"<bullet>&bull;</bullet> {p}", bullet))
    story.append(Spacer(1, 0.3*cm))

    # ══════════════════════════════════════════════════════════════════════════
    # SECTION 9: NEW TECHNOLOGY
    # ══════════════════════════════════════════════════════════════════════════
    story.append(Paragraph("9. New Technology &amp; Developments", h1))
    story.append(section_rule())
    story.append(Paragraph(
        "The number of new stapling devices entering the market continues to increase. All adhere to the "
        "same \"B\"-shape staple principle but incorporate innovations for specific clinical needs:", body))
    new_tech = [
        ["Innovation", "Description"],
        ["Powered / motorised handles", "Consistent firing speed regardless of surgeon hand strength; reduces variation in staple formation across tissue types"],
        ["Articulating laparoscopic heads", "Multi-directional articulation allows optimal tissue angle in deep pelvis or difficult laparoscopic anatomy; available in Endo-GIA, Echelon Flex"],
        ["Robotic linear staplers", "Integrated into robotic platforms (da Vinci, Hugo); allows precise angulation and controlled firing under direct vision"],
        ["Tri-staple technology", "Three rows of variable-height staples in one cartridge (e.g. Medtronic Tri-Staple); adapts to tissue thickness variations across a single firing"],
        ["Curved cutting staplers", "Contour stapler (Ethicon) — curve/bend in cartridge for better deep pelvic access; fires and cuts simultaneously"],
        ["Buttress-integrated cartridges", "Synthetic absorb absorbable matrix pre-loaded on cartridge; reduces need for separate reinforcement material application"],
        ["Smart staplers", "Sensors providing real-time feedback on tissue thickness and optimal staple height; audible/visual indicators (e.g. Ethicon ECHELON with gripping surface technology)"],
    ]
    nt_col = [W*0.28, W*0.72]
    nt_table = Table(
        [[Paragraph(cell, ParagraphStyle('tc', fontName='Helvetica-Bold' if r==0 else 'Helvetica',
                                          fontSize=9.5 if r>0 else 10,
                                          textColor=WHITE if r==0 else DARK_GRAY,
                                          leading=13)) for cell in row]
         for r, row in enumerate(new_tech)],
        colWidths=nt_col, repeatRows=1)
    nt_table.setStyle(std_table_style())
    story.append(nt_table)

    # ══════════════════════════════════════════════════════════════════════════
    # REFERENCES
    # ══════════════════════════════════════════════════════════════════════════
    story.append(Spacer(1, 0.5*cm))
    story.append(Paragraph("References &amp; Sources", h1))
    story.append(section_rule())
    refs = [
        "Cone MM, Geiger TM. <i>Intestinal Division and Anastomosis — Stapling Techniques.</i> In: <b>Hinman's Atlas of Urologic Surgery</b>, 4th ed. Elsevier, 2017. pp. 55-58.",
        "Sabiston DC. <i>Surgical Staplers.</i> In: <b>Sabiston Textbook of Surgery: The Biological Basis of Modern Surgical Practice</b>, 21st ed. Elsevier, 2022.",
        "Oberkofer CE, Nocito A. <i>Surgical Staplers.</i> In: <b>Fischer's Mastery of Surgery</b>, 8th ed. Lippincott Williams & Wilkins, 2023. Chapter 16.",
        "Steichen FM. <i>Stapling Techniques: General Surgery</i>, 3rd ed. U.S. Surgical Corporation, 1988.",
        "Goulder F. Bowel anastomoses: the theory, the practice and the evidence base. <i>World J Gastrointest Surg.</i> 2012;4(9):208-213.",
        "Hunt SR, Silviera ML. <i>Anastomotic construction.</i> In: Steele SR et al., eds. <b>The ASCRS Manual of Colon and Rectal Surgery</b>, 3rd ed. Springer, 2019:119-133.",
        "Beart RW, Kelly KA. Randomized prospective evaluation of the EEA stapler for colorectal anastomoses. <i>Am J Surg.</i> 1981;141:143-147.",
    ]
    for ref in refs:
        story.append(Paragraph(f"<bullet>&bull;</bullet> {ref}", source_style))

    # ── Build ────────────────────────────────────────────────────────────────
    doc.build(story,
              onFirstPage=on_first_page,
              onLaterPages=on_page)
    print(f"PDF saved to: {OUTPUT_PATH}")

if __name__ == "__main__":
    build()

Running Command

cd /home/daytona/workspace/intestinal-staplers && python generate_pdf.py 2>&1

Running Command

ls -lh /home/daytona/workspace/intestinal-staplers/Intestinal_Staplers.pdf

The PDF was generated successfully at 6.1 MB with all content and images embedded. Here is your download link:

Intestinal Staplers

PDF Document · PDF

What's inside the PDF (9 sections, ~15 pages):

Section	Content
Cover page	Professional dark-blue title cover
1. Introduction	History from 1908 to modern era
2. Basic Principle	"B" shape mechanism with image
3. Types of Staplers	GIA, TA, EEA, Curved — with full parts tables and color-coding table
4. Technique	Step-by-step tables for side-to-side & EEA colorectal anastomosis + 6 surgical diagrams
5. Indications	14-row table covering all GI procedures
6. Complications	9-complication table with mechanisms and management + SLR sub-table
7. Stapled vs. Hand-sewn	Direct comparison table
8. Technical Pearls	11 key operative tips
9. New Technology	7 modern innovations table + full references

All pages include a header bar with page number and a footer with source citations.

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