Classification of Sterilization Methods in Gynaecology & Obstetrics

Classification Overview

STERILIZATION METHODS
│
├── FEMALE STERILIZATION
│   ├── A. Surgical (Tubal Occlusion/Destruction)
│   │   ├── 1. At Laparotomy
│   │   │   ├── Pomeroy / Modified Pomeroy
│   │   │   ├── Irving method
│   │   │   ├── Uchida method
│   │   │   ├── Madelenr technique (abandoned)
│   │   │   └── Partial salpingectomy (Parkland/separate sutures)
│   │   ├── 2. Minilaparotomy
│   │   │   ├── Postpartum (subumbilical)
│   │   │   └── Interval
│   │   └── 3. Laparoscopic
│   │       ├── Bipolar electrocoagulation
│   │       ├── Unipolar electrocoagulation (abandoned)
│   │       ├── Falope ring (Silastic band)
│   │       ├── Hulka-Clemens clip (spring clip)
│   │       ├── Filshie clip (titanium)
│   │       └── Salpingectomy (partial or total)
│   └── B. Transcervical / Hysteroscopic
│       └── Essure microinsert (now withdrawn from market)
│
└── MALE STERILIZATION
    └── Vasectomy

I. Female Sterilization — Surgical Methods at Laparotomy

1. Pomeroy / Modified Pomeroy Technique

• Simple, well-established technique
• Suitable at caesarean section (adds minimal operative time)
• Suitable postpartum minilaparotomy — tubes are enlarged and accessible through a 3–4 cm subumbilical incision
• Failure rates: 7.5 per 1,000 procedures at 10 years (postpartum partial salpingectomy, CREST study)

• Requires laparotomy or minilaparotomy
• Modest reversal success compared to clip methods (more tube destroyed)

2. Irving Method

• Extremely low failure rate — pregnancy "exceedingly rare"
• Effective when highest certainty is needed (e.g., at caesarean section)

• More complex surgical technique
• Essentially irreversible

3. Uchida Method

• Zero pregnancies in Uchida's personal series of >20,000 cases
• Very high efficacy

• Technically demanding
• Requires experience; rarely performed outside specialist centres

4. Madlener Technique (now abandoned)

II. Laparoscopic Methods

1. Bipolar Electrocoagulation

• Can be applied to any fallopian tube, including thickened tubes from prior salpingitis
• Highly effective when ≥3 sites coagulated: 3.2 per 1,000 at 5 years (CREST)
• Widely available equipment

• Risk of tuboperitoneal fistula → >50% of subsequent pregnancies are ectopic
• If <3 sites coagulated: failure rate jumps to 12.9 per 1,000 at 5 years
• 10-year cumulative failure: 24.8 per 1,000 (overall, CREST)
• Unipolar coagulation was abandoned due to risk of bowel burns

2. Falope Ring (Silastic Band / Yoon Ring)

• Mechanical, no electrical energy required
• Failure resulting from misapplication usually causes intrauterine (not ectopic) pregnancy
• 10-year failure: 17.7 per 1,000 (CREST)
• Potential for reversal (more tube preserved than coagulation)

• Cannot be applied if tube is thickened (e.g., from prior salpingitis) — risk of laceration
• More postoperative pain in first several hours (prevented by bathing tube with 0.5% bupivacaine pre-placement)
• If tube cannot be pulled into applicator, must switch to electrical coagulation

3. Hulka-Clemens Clip (Spring Clip)

• Minimal tissue destruction → best reversibility of all methods
• No electrical energy required

• Highest failure rate among laparoscopic methods: 36.5 per 1,000 at 10 years (CREST)
• Cannot be applied to thickened tubes
• Largely supplanted by Filshie clip in clinical practice

4. Filshie Clip (Titanium Clip)

• Lower failure rate than Hulka clip (has largely supplanted it)
• Preserves a reasonable tube length for potential reversal
• Used extensively in UK and Canada; introduced in the US in 1996

• Cannot be applied to thickened tubes
• Misapplication is the primary cause of failure; subsequent pregnancy tends to be intrauterine

5. Laparoscopic Salpingectomy (Partial or Total)

• Reduces risk of ovarian/fallopian tube cancer — most high-grade serous carcinomas arise in the distal fallopian tube; now recommended prophylactically when women undergo gynecologic surgery for benign indications
• No increased complication rate vs. occlusion methods (only ~6–10 min additional operative time)
• Eliminates ectopic pregnancy risk entirely
• Growing as the preferred technique for permanent sterilization

• Longer operative time
• Essentially irreversible
• Requires up to 3 ports

III. Transcervical / Hysteroscopic Sterilization

Essure Microinsert (withdrawn from market)

• No abdominal incision or general anaesthesia
• Office-based procedure
• Highly effective when confirmed occlusion achieved
• Highly effective permanent contraception

• Manufacturer removed the product from the market due to reports of adverse patient reactions (device migration, persistent pain, nickel hypersensitivity)
• Required 3-month HSG confirmation with interim contraception
• Should be considered essentially irreversible — reversal using tubouterine implantation has been reported; only 36% subsequently conceived naturally
• Hysteroscopic sterilization reversal is technically challenging

IV. Vasectomy (Male Sterilization)

• Safer, cheaper, and less invasive than female sterilization
• Highly effective, long-lasting
• No hormonal effects
• Short recovery time

• Psychological barriers (male acceptance)
• Reversal (vasovasostomy) possible but success rates decline with time
• Azoospermia not immediate — requires post-procedure semen analysis to confirm

V. Comparative Failure Rates (CREST Study — 10-Year Cumulative Probability per 1,000 Procedures)

VI. Key Points on Timing & Special Situations

VII. Noncontraceptive Benefits

• Tubal ligation → reduced ovarian cancer risk: Nurses' Health Study (n=29,340): HR 0.76 (95% CI 0.64–0.90) for overall ovarian cancer; significant reductions in high-grade serous, endometrioid, and clear-cell histotypes
• Bilateral salpingectomy: Additional cancer risk reduction now drives preference toward salpingectomy over simple occlusion

VIII. Causes of Sterilization Failure

1. Pre-existing pregnancy at time of surgery (pregnancy test mandatory on day of procedure)
2. Inadequate technique — insufficient coagulation sites, incomplete clip placement
3. Luteal phase pregnancy — conception just before surgery
4. Tuboperitoneal fistula (after bipolar coagulation) → ectopic pregnancy in >50% of subsequent failures
5. Adhesions obscuring tube identification
6. Misidentification of round ligament as tube