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Laser-assisted intracytoplasmic sperm injection in human oocytes
Ali Eroglu1, Ravit T Nahum, Keith Isaacson
1Vincent Memorial Obstetrics and Gynecology Service, Massachusetts General Hospital and Harvard Medical School, and Surgical Services, Massachusetts General Hospital, Harvard Medical School and Shriners Burns Hospital, Boston, Massachusetts, USA.
The Journal of Reproductive Medicine
|April 6, 2002
Summary
A 1,480-nm diode laser effectively immobilizes sperm and creates openings in the zona pellucida for intracytoplasmic sperm injection (ICSI). This laser technology shows promise for improving ICSI procedures and related assisted reproductive technologies.
Area of Science:
- Reproductive biology
- Laser technology in medicine
- Assisted reproductive technology
Background:
- Intracytoplasmic sperm injection (ICSI) is a key technique in assisted reproduction.
- Conventional ICSI methods involve mechanical manipulation that can potentially harm oocytes.
- Novel non-contact laser technologies offer potential advantages for delicate micromanipulation procedures.
Purpose of the Study:
- To evaluate the efficacy and safety of a non-contact 1,480-nm diode laser for intracytoplasmic sperm injection (ICSI) in human oocytes.
- To explore the laser's utility in sperm immobilization and zona pellucida (ZP) penetration.
- To assess the impact of the laser procedure on oocyte viability and early developmental markers.
Main Methods:
- Human oocytes, previously subjected to conventional in vitro fertilization (IVF) without success, were utilized.
- A 1,480-nm diode laser was employed for non-contact sperm immobilization and creating a micro-hole in the ZP.
- Oocytes underwent ICSI through the laser-created opening, followed by assessment of pronuclear formation, cleavage, and cytoskeletal integrity.
Main Results:
- The laser facilitated rapid sperm immobilization and ZP microdrilling, simplifying microinjection.
- Out of 78 injected oocytes, 68% survived the procedure.
- 25% of surviving oocytes developed two pronuclei within 18 hours, with some progressing to the eight-cell stage.
- Cytoskeletal analysis of simulated procedures showed no significant abnormalities.
Conclusions:
- The 1,480-nm diode laser is a viable tool for sperm immobilization and ZP manipulation during ICSI.
- This technology can enhance ICSI efficiency and potentially benefit related procedures like preimplantation genetic diagnosis (PGD) and assisted hatching.
- The non-contact nature of the laser may reduce mechanical stress on oocytes, improving outcomes in assisted reproduction.