A valve assembly adapted for introduction of surgical instruments into a patient's body includes a valve body formed of a flexibly resilient material which defines an aperture for reception of the instrument. The aperture is configured and dimensioned such that insertion of the instrument into the aperture...http://www.google.es/patents/US5360417?utm_source=gb-gplus-sharePatente US5360417 - Valve assembly for introducing instruments into body cavities
Valve assembly for introducing instruments into body cavities
