Tissue core biopsy cannula
First Claim
1. A tissue core biopsy cannula, comprising:
- a member having a wall and a distal end,wherein the wall defines an opening at the distal end for receiving tissue, andwherein a first half of the distal end of the wall lies in a first plane and a second half of the distal end of the wall lies in a second plane at an acute angle to the first plane.
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Accused Products
Abstract
A tissue core biopsy cannula of the present invention includes a distal end which is ground in two planes which intersect each other at a first angle along a line which intersects the longitudinal axis of the cannula at a second angle. This produces a cardioid shaped opening in the distal end of the cannula. The entire edge of the sidewall is thereby inclined inward toward the distal opening and two distal cutting edges are provided. According to the presently preferred embodiment, the first angle at which the two planes intersect is approximately 60° and the second angle at which the intersection of the two planes intersects the longitudinal axis of the cannula is approximately 20°. In order to aid in removal of the biopsy sample from the target tissue site, the cannula according to the invention is provided with side fenestration holes and/or a split end which aids in grasping the tissue so that it can be pulled away from the target tissue site. The cannula according to the invention may be used with a solid stylet or a notched stylet and may be provided as part of a manual or automatic biopsy tool. A preferred stylet for use with the cannula has a distal end which is also ground in two planes like the distal end of the cannula.
138 Citations
15 Claims
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1. A tissue core biopsy cannula, comprising:
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a member having a wall and a distal end, wherein the wall defines an opening at the distal end for receiving tissue, and wherein a first half of the distal end of the wall lies in a first plane and a second half of the distal end of the wall lies in a second plane at an acute angle to the first plane. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A tissue core biopsy cannula, comprising:
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a member having a wall and a distal end, wherein the wall defines an opening at the distal end for receiving tissue, and wherein the distal end of the wall lies in more than one plane, a first portion of the distal end of the wall lies in a first plane and a second portion of the distal end of the wall lies in a second plane, and the first and second planes intersect along a line, the line forming an angle with a longitudinal axis of the member. - View Dependent Claims (8, 9)
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10. A tissue core biopsy cannula, comprising:
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a member having a wall and a distal end, wherein the wall defines an opening at the distal end for receiving tissue, and wherein the distal end of the wall lies in more than one plane, and the opening has a cardioid shape.
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11. A tissue core biopsy cannula, comprising:
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a member having a wall and a distal end, wherein the wall defines an opening at the distal end for receiving tissue, and wherein the distal end of the wall lies in more than one plane, and the member defines at least one side opening in the wall for securing a tissue sample inside the distal end of the member. - View Dependent Claims (12, 13)
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14. A tissue core biopsy cannula, comprising:
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a substantially cylindrical tube having a wall and a distal end, wherein the wall defines an opening at the distal end for receiving tissue and includes a cutting edge for severing tissue, and wherein the distal end of the wall includes a first portion lying in a first plane and a second portion lying in a second plane, and the tube defines a lumen having a longitudinal axis, the first and second planes intersecting along a line that forms an acute angle with the longitudinal axis. - View Dependent Claims (15)
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Specification