Medical device for providing access
The invention provides, in one embodiment, a multifunctional, multi-piece medical device and related method for providing access to an internal body cavity, such as for use with a vacuum lift shell. The device can include a cannula and a cannula extension. The device provides a conduit between the external environment and operative field inside the patient's body during medical procedures, including diagnostic, therapeutic and surgical procedures. The invention allows entry and exit of air or gas to help create and maintain the operative field. The invention can be used to provide an open and unobstructed working path, and allows the operative space to be maintained at ambient conditions of pressure and temperature.
1. An assembly comprising:
a vacuum device having a perimeter portion sized and shaped to be positioned against a portion of a patient's body and shell portion disposed inward of the perimeter portion, the shell portion having a generally convex outer surface and a generally concave inner surface, the vacuum device operable for providing an operative space within a patient; and
a multicomponent device for providing access through the shell portion from a point external of the vacuum device to a point within the patient; the multicomponent device comprising detachable first and second members, the first member for providing a first portion of an access passageway, and the second member for providing a second portion of an access passageway, the first member comprising a proximal end, a pointed distal end, and an attachment portion positioned between the proximal and distal ends, the attachment portion comprising a means for attaching to a proximal end of the second member.
2. The assembly of claim 1 wherein the first member has an open distal tip at the distal end.
3. The assembly of claim 1 wherein the first member has a closed distal tip at the distal end.
4. The assembly of claim 1 wherein at the distal end has a pointed tip selected from the group consisting of bifurcated and non-bifurcated tips.
5. The assembly of claim 1 wherein the first member comprises a relatively rigid body portion and a relatively flexible distal end portion.
6. The assembly of claim 1 further comprising a cap releasably attachable to the proximal end of at least one of the first member and the second member.
7. The assembly of claim 1 further comprising a cap releasably attachable to the proximal end of both the first member and the second member.
8. The assembly of claim 1 wherein the first member comprises a tip at the distal end adapted to pierce a perforable membrane.
9. The assembly of claim 1 wherein the first member comprises at least one opening through a wall of the first member, the at least one opening spaced proximally of the distal end of the first member.
10. The assembly of claim 1 wherein the first member comprises a plurality of openings through the wall of the first member.
11. The assembly of claim 1 wherein the second member comprises a beveled distal end.
12. The assembly of claim 1 wherein the second member comprises at least one opening through a wall of the second member, the at least one opening spaced proximally of the distal end of the second member.
13. The assembly of claim 1 comprising a sleeve positionable along an outside surface of the first member.
14. The assembly of claim 1 wherein at least one of the first and second members comprises a generally transparent wall.
15. The assembly of claim 1 wherein at least one of the first and second members comprises a non-circular cross section.