Multi-seal trocar system
View Patent ↗A multi-seal trocar system includes a plurality of co-axial sealing elements adapted for forming a seal with either a large or small instrument. Small and large sealing elements are disposed in an in-line arrangement such that a-single port is provided for instrument insertion. A zero seal is disposed distally of the sealing elements to seal a working channel of the system and to prevent backflow when no instruments are inserted. The small sealing element is configured such that insertion of a large instrument automatically moves the small sealing element out of its path, thereby avoiding contact with the large instrument.
1. A trocar system comprising:
a housing comprising a proximal portion and a distal portion;
a cap assembly comprising:
a cap coupled to the proximal portion of the housing and having an orifice therethrough,
a plurality of protectors in a rest state extending proximally away from the orifice and outside of and away from the cap and the housing, and
a small-sized seal element coupled to the protectors;
a guide assembly disposed at least in part within the housing, distal to the cap assembly, the guide assembly comprising:
a tube, and
a large-sized seal disposed at a distal portion of the tube, substantially coaxial with the small-sized seal element; and
a zero seal element disposed at least in part within the housing, substantially coaxial with the large-sized seal element and the small-sized seal element, the zero seal element comprising a distal end disposed adjacent to the distal portion of the housing, and distal to the small-sized seal element and the large-sized seal element.
2. The system of claim 1 , wherein at least one of the protectors comprises a proximal bump, positioned, dimensioned, and configured to contact and to shield the large instrument from contacting the small-sized seal element.
3. The system of claim 1 , wherein the small-sized seal element comprises a radially stretchable septum.
4. The system of claim 1 , wherein the small-sized seal element is comprises a first material and the large-sized seal comprises a second material, wherein the first material is more flexible than the second material.
5. The system of claim 4 , wherein the second material is more puncture-resistant than the first material.
6. The system of claim 1 , wherein the zero seal element comprises a duckbill-type seal.
7. The system of claim 1 , wherein the zero seal element comprises a plenum in which at least a portion of the guide assembly is disposed.
8. The system of claim 1 , further comprising a cannula formed integrally with the housing and extending distally therefrom.
9. The system of claim 1 wherein the tube is an elongate tube having a height greater than a width of the tube, a proximal end of the tube connected to the cap adjacent to the plurality of protectors.
10. The system of claim 1 wherein the small-sized seal element is a monolithic elastomeric septum saucer with a distally extending outer portion curving into a proximally extending central portion.
11. The system of claim 1 wherein the small-sized seal element in a rest state extends proximally away from the large-sized seal element and towards the plurality of protectors with a distal end of the small-sized seal element extending proximally towards a distal end of the plurality of protectors.
12. The system of claim 1 wherein the cap has a raised portion exteriorly surrounding the orifice through the cap and the plurality of protectors being attached to the raised portion of the cap peripherally around the orifice.
13. The system of claim 1 wherein the small-sized seal element in a rest state extends proximally towards the plurality of protectors with a proximally extending central portion of the small-sized seal element contacting distally extending portions of the plurality of protectors.
14. The system of claim 13 wherein the small-sized seal element comprises a curvilinear outer portion extending distally towards the large-sized seal element and curving up into the proximally extending central portion of the small-sized seal element.