Clinical experience with an alloplastic spermatocele

Area of Science:

• Reproductive Medicine
• Biomaterials Science

Background:

• Aplasia or stenosis of the vas deferens presents a significant challenge in male infertility.
• Existing treatments for such conditions have limitations, necessitating innovative approaches.

Observation:

• A cup-shaped silicone-dacron prosthesis was developed and tested as a sperm reservoir.
• In animal models (rats and bulls), this prosthesis facilitated sperm storage and subsequent successful pregnancies.
• In human patients with vas deferens abnormalities, the prosthesis was implanted epididymally, allowing percutaneous sperm aspiration.

Findings:

• Spermatozoa aspirated from the reservoir in cows, stored cryogenically, resulted in a 50% pregnancy rate.
• In human patients, up to 105 million spermatozoa were retrieved per aspiration up to 7 months post-implantation.
• Sperm quality and quantity varied, decreasing with longer postoperative delays, with positive sperm counts averaging 2 months.

Implications:

• This alloplastic reservoir offers a potential solution for sperm retrieval in cases of obstructive azoospermia.
• Early and frequent aspirations may maximize sperm yield for timed insemination or cryopreservation.
• Further research is needed to improve sperm quality and optimize pregnancy rates in human applications.