Trocar
First Claim
1. A trocar comprising:
- a cannula having a lumen extending axially throughout its length and having a distal end and a proximal end;
a generally U-shaped flange affixed to the proximal end of said cannula and aligned generally parallel to and radially offset from the longitudinal axis of said cannula;
said U-shaped flange including a first mating surface, and the confronting surfaces of the interior of said U-shaped flange forming a portion of a V-bed;
a rod having a closed distal end and a proximal end and adapted for slidable insertion into said cannula lumen, said rod having a length greater than said cannula;
a generally planar flange attached to the proximal end of said rod;
said rod flange including a second mating surface adapted to mate with said first mating surface and including a projection extending from said second mating surface having surfaces forming a second portion of said V-bed and cooperating with said first portion of said V-bed to form an interfitting V-bed for restraining relative rotation between said rod and said cannula and for restraining said rod from receding into said cannula as said trocar is advanced through body tissue during insertion.
3 Assignments
0 Petitions
Accused Products
Abstract
A trocar apparatus and method for introducing a drainage catheter into a drainage area of the body. The trocar includes a hollow cannula and a rod. The rod has a closed distal end and is longer than the cannula so that it can slide into the cannula and, when fully inserted, project a predetermined distance past the distal end of the cannula. The proximal ends of the cannula and the rod have respective supports which will contact one another to limit the forward motion of the rod into the cannula and an interfitting device cooperatively disposed on the supports to permit the user to hold the rod and the cannula in fixed relationship during insertion of the trocar. A catheter holder is placed on the cannula support. The projecting end of the rod is inserted into a drainage opening in the distal tip of the catheter, and a proximal portion of the catheter is held in the catheter holder, so that prior to insertion the catheter is aligned generally along the outside of the cannula. The flexible tip of the rod aligns itself generally along the axis of the catheter, so that during insertion the catheter presents a small cross-section to the tissue through which it is advancing. After the catheter is advanced to its desired position in the body, the rod is withdrawn into the cannula to free the distal tip of the catheter, the proximal portion of the catheter is released from the catheter holder, and then the cannula and the rod are removed from the body leaving the catheter in place.
54 Citations
11 Claims
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1. A trocar comprising:
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a cannula having a lumen extending axially throughout its length and having a distal end and a proximal end; a generally U-shaped flange affixed to the proximal end of said cannula and aligned generally parallel to and radially offset from the longitudinal axis of said cannula; said U-shaped flange including a first mating surface, and the confronting surfaces of the interior of said U-shaped flange forming a portion of a V-bed; a rod having a closed distal end and a proximal end and adapted for slidable insertion into said cannula lumen, said rod having a length greater than said cannula; a generally planar flange attached to the proximal end of said rod; said rod flange including a second mating surface adapted to mate with said first mating surface and including a projection extending from said second mating surface having surfaces forming a second portion of said V-bed and cooperating with said first portion of said V-bed to form an interfitting V-bed for restraining relative rotation between said rod and said cannula and for restraining said rod from receding into said cannula as said trocar is advanced through body tissue during insertion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification