Cannula with distal end valve
First Claim
1. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, wherein said tubular body is substantially longer than said valve and said tubular body length is such that said distal end of said penetrating member protrudes from said valve when said penetrating member hub abuts said proximal end of said tubular body, and wherein said valve is normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body.
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Accused Products
Abstract
A cannula for introducing medical instruments into an anatomical cavity includes an elongate tubular body defining a lumen and a valve protruding distally from the tubular body for preventing fluid flow through the lumen when medical instruments are withdrawn from the anatomical cavity into the tubular body. The valves are preferably configured as one-way valves such that external forces and pressures exerted on the valves from outside the cannula will not cause the valves to open. The valves can form rounded or blunt distal ends when closed or can be configured in a manner to penetrate anatomical tissue when closed. Furthermore, spring members can be embedded in the valves to provide reinforcement and to bias the valves to a closed condition.
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Citations
28 Claims
- 1. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, wherein said tubular body is substantially longer than said valve and said tubular body length is such that said distal end of said penetrating member protrudes from said valve when said penetrating member hub abuts said proximal end of said tubular body, and wherein said valve is normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body.
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10. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal and mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, said tubular body having a length permitting said distal end of said penetrating member to protrude from said valve when said penetrating a member hub abuts said proximal end of said tubular body, said valve being normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body;
wherein said valve defines a substantially smooth convex surface when preventing fluid flow through said lumen. - View Dependent Claims (11, 12, 13)
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14. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, said tubular body having a length permitting said distal end of said penetrating member to protrude from said valve when said penetrating member hub abuts said proximal end of said tubular body, said valve being normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body;
wherein said valve includes a flap pivotally mounted at a distal end of said tubular member and biased to a closed position against said distal end of said tubular member. - View Dependent Claims (15)
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16. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, said tubular body having a length permitting said distal end of said penetrating member to protrude from said valve when said penetrating member hub abuts said proximal end of said tubular body, said valve being normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body;
wherein said valve is made of an elastic material reinforced by spring members.
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17. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, said tubular body having a length permitting said distal end of said penetrating member to protrude from said valve when said penetrating member hub abuts said proximal end of said tubular body, said valve being normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body;
wherein said tubular body and said valve are formed separately and further comprising means for detachably coupling said valve with said tubular body.
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18. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a valve protruding distally from said distal end of said tubular body, said tubular body having a length permitting said distal end of said penetrating member to protrude from said valve when said penetrating member hub abuts said proximal end of said tubular body, said valve being normally biased to a closed state preventing fluid flow through said lumen when said penetrating member is withdrawn from said cannula and no medical instruments are inserted into the anatomical cavity through said tubular body;
and further comprising a membrane disposed around said tubular member and means for expanding said membrane.
- 19. In combination, a cannula for establishing a passage through an anatomical cavity wall to permit insertion of medical instruments into the anatomical cavity and a penetrating member disposed in said cannula and having a proximal end mounted by a hub and a sharp distal end for penetrating anatomical tissue, said cannula comprising an elongate tubular body defining a lumen and having a proximal end for placement outside the anatomical cavity and a distal end for placement within the anatomical cavity, and a seal protruding distally from said distal end of said tubular body, wherein said tubular body is substantially longer than said seal and said tubular body length is such that said distal end of said penetrating member protrudes from said seal when said penetrating member hub abuts said proximal end of said tubular body, and wherein said seal engage said penetrating member and medical instruments inserted through said cannula after said penetrating member is withdrawn to prevent fluid flow through said lumen when the penetrating member and medical instruments are inserted into the anatomical cavity through said cannula.
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24. A method of forming a portal in the wall of an anatomical cavity comprising the steps of
fitting a penetrating member within a cannula so that a sharp tip of the penetrating member protrudes distally from a distal end of the cannula; -
using the sharp tip of the penetrating member to create an opening in the anatomical cavity wall; advancing the penetrating member and the cannula through the opening created in the anatomical cavity wall; moving at least one of the penetrating member and the cannula relative to one another such that the sharp tip of the penetrating member is proximally spaced from the distal end of the cannula; and closing a valve disposed at the distal end of the cannula. - View Dependent Claims (25, 26, 27, 28)
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Specification