Intra Cytoplasmic Sperm Injection

Intra Cytoplasmic Sperm Injection (ICSI)

Before a man’s sperm can fertilize a woman’s egg, the head of the sperm must attach to the outside of the egg.  Once attached, the sperm pushes through the outer layer to the inside of the egg (cytoplasm), where fertilization takes place. Sometimes the sperm cannot penetrate the outer layer, for a variety of reasons. The egg’s outer layer may be thick or hard to penetrate or the sperm may be unable to swim. In these cases, a procedure called intracytoplasmic sperm injection (ICSI) can be done along with in vitro fertilization (IVF) to help fertilize the egg. During ICSI, a single sperm is injected directly into the cytoplasm the egg.

Intracytoplasmic sperm injection(ICSI). In ICSI, a single healthy sperm is injected directly into each mature egg. ICSI is often used when semen quality or number is a problem or if fertilization attempts during prior IVF cycles failed. In the ICSI process, a tiny needle, called a micropipette, is used to inject a single sperm into the center of the egg. With either traditional IVF or ICSI, once fertilization occurs, the fertilized egg (now called an embryo) grows in a laboratory for 1 to 5 days before it is transferred to the woman’s uterus (womb).

CSI helps to overcome fertility problems, such as:

  1. The male partner produces too few sperm to do artificial insemination (intrauterine insemination [IUI]) or IVF.
  2. The sperm may not move in a normal fashion.
  3. The sperm may have trouble attaching to the egg.
  4. A blockage in the male reproductive tract may keep sperm from getting out.
  5. Eggs have not fertilized by traditional IVF, regardless of the condition of the sperm.
  6. In vitro matured eggs are being used.
  7. Previously frozen eggs are being used.

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