Multi-use cannula system
First Claim
1. A surgical combination infusion/aspiration cannula comprising an elongated probe member characterized by:
- (a) a single tubular distal section having a generally cylindrical, axially asymmetrical, hollow interior bore, the asymmetry producing relatively thick and relatively thin sidewall sectors, the interior bore configured to optionally carry a stilette member therein;
(b) an insertion tip distally contiguous with the tubular section and of asymmetrically reduced outer cross-section with respect to the tubular section;
(c) a transition portion in the form of a gradual arcuate taper, the taper being generally in the relatively thin wall sector of the tubular section;
(d) the tip portion further comprising a rounded blunt closed tissue penetration end for atraumatically penetrating subcutaneous tissue and having a generally radially disposed infusion/aspiration opening rearward of the penetration end, the opening being configured with the asymmetry of cross-section so as to be at least partially protected to prevent incursion of foreign material during insertion of the probe; and
(e) wherein the edges of the opening have a blunt outward directed surface and sharpened inner edge component configured to cooperate with the cutting surface of a compatible stilette member to excise tissue specimens.
0 Assignments
0 Petitions
Accused Products
Abstract
A universal infusion/aspiration cannula system includes a generally rounded tubular cannula member having a conduit or tubular portion provided with a rounded, partially, open, blunt insertion tip and a proximal end adaptable to standard fittings. The cannula alone allows for the blunt atraumatic dissection through intervening tissues and upon withdrawal, the simultaneous infusion of space filling substances, living tissues or hemostatic agents. A stilette member is provided which is operable within the cannula and the external dimensions of which approximate the internal dimensions of the cannula member wherein the stilette can be rotated or advanced and retracted as a saw to either amputate, cut or saw and grasp a biopsy specimen.
279 Citations
4 Claims
-
1. A surgical combination infusion/aspiration cannula comprising an elongated probe member characterized by:
-
(a) a single tubular distal section having a generally cylindrical, axially asymmetrical, hollow interior bore, the asymmetry producing relatively thick and relatively thin sidewall sectors, the interior bore configured to optionally carry a stilette member therein; (b) an insertion tip distally contiguous with the tubular section and of asymmetrically reduced outer cross-section with respect to the tubular section; (c) a transition portion in the form of a gradual arcuate taper, the taper being generally in the relatively thin wall sector of the tubular section; (d) the tip portion further comprising a rounded blunt closed tissue penetration end for atraumatically penetrating subcutaneous tissue and having a generally radially disposed infusion/aspiration opening rearward of the penetration end, the opening being configured with the asymmetry of cross-section so as to be at least partially protected to prevent incursion of foreign material during insertion of the probe; and (e) wherein the edges of the opening have a blunt outward directed surface and sharpened inner edge component configured to cooperate with the cutting surface of a compatible stilette member to excise tissue specimens. - View Dependent Claims (2)
-
-
3. A combination infusion/aspiration cannula comprising an elongated probe member characterized by:
-
(a) a generally cylindrical tubular shaft section having a hollow interior lumen; (b) an insertion tip section at the distal end of the tubular shaft section comprising a relatively blunt, snub-nosed, but gradually curved, tissue penetrating distal tip section having a closed distal tip end of greatly reduced outer cross-section with respect to the cylindrical tubular shaft section for atraumatically penetrating subcutaneous tissue; (c) a transition portion of the cannula between the tubular shaft and the snub-nosed tip describing a slightly convex lower taper shape and a slightly concave recessed upper taper curve shape; (d) an angularly disposed infusion/aspiration port opening accessing the distal end of the interior lumen in the upper shape of the transition section proximal of the closed snub-nosed tip and distal of the cylindrical shaft, the opening being contained within the tapered cross-sectional area and directed at an acute angle with the axis of the cylindrical tubular shaft of the cannula; (e) wherein the edge of the infusion/aspiration port opening is itself further characterized by a dull, curved transition surface; and (f) wherein the diameter of the infusion/aspiration port opening is less than half of the external diameter of the cannula. - View Dependent Claims (4)
-
Specification