The study is to evaluate a device for male reproductive sterilization and determine if this device is successful at blocking the sperm.

Ninety subjects from two centers in the United Stated will be followed closely for 24 months.

If you are someone interested in a vasectomy, you may be eligible to participate in this clinical study.

This feasibility study is intended to collect pertinent clinical information on the use of the Shepherd Medical Intra Vas Device (IVD) necessary to support the design of a future pivotal study. The IVD is intended to occlude the vas deferens and thus accomplish male reproductive sterilization and to offer an additional method to vasectomy.

Inclusion Criteria:

1. Subject desires to undergo a vasectomy.
2. Freely consents to participate in the Study a
3. Agrees to provide a semen sample at regularized periods for at least 30 months.
4. Willing to use a redundant method of contraception until successful occlusion is confirmed.
5. Agrees to provide follow-up information.
6. Willing and able to understand and agree to follow all aspects of the procedures and Study requirements.
7. At least 18 years of age.

Exclusion Criteria:

1. Has a condition permanently or temporarily making participation in the Study inadvisable.
2. Has a condition permanently or temporarily making a vasectomy inadvisable.
3. Has had a previous successful/unsuccessful vasectomy.
4. Has had an allergic reaction to silicone and/or ethylene.