Exchangeable core biopsy needle

Patent metadata

Field	Value
Publication number	US-2016199047-A1
Application number	US-201514595392-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present disclosure generally relates to a biopsy needle configured to maximize tissue sampling yield and collect a cohesive unit of sampled tissue. The biopsy needle includes an elongate tubular body comprising a lumen extending therethrough from a proximal open end to a distal open end of the body. The distal end includes first and second tip portions extending therefrom and formed on opposing sides of the needle body. The first tip portion generally extends further from the distal end than the second tip portion, resembling a staggered configuration, resulting in an increased surface area of multiple cutting edges formed between the first and second tip portions on either side of the needle body. Additionally, each of the first and second tip portions defines a penetrating point configured to pierce the tissue to be sampled and further direct sampled tissue towards the lumen of the body to be excised by the cutting edges upon contact therewith.

First claim

What is claimed is:

1 . A biopsy needle comprising:
an elongate tubular body having a longitudinal axis and comprising a lumen extending therethrough from an open proximal end to an open distal end of the body, the distal end comprising a first tip portion extending from the distal end and having a first length and a second tip portion extending from the distal end and having a second length that is less than the first length of the first tip portion.

2 . The biopsy needle of claim 1 , wherein the first and second tip portions are on opposing sides of the body.

3 . The biopsy needle of claim 2 , wherein the first and second tip portions are spaced apart in the range of 175 to 180 degrees along a circumference of the body.

4 . The biopsy needle of claim 1 , wherein the first tip portion is formed from a first set of distinct angular bevel grinds oblique to the longitudinal axis of the body and the second tip portion is formed from a second set of distinct angular bevel grinds oblique to the longitudinal axis of the body.

5 . The biopsy needle of claim 4 , wherein the first set of angular bevel grinds comprises a first bevel grind on one side of the body and a second bevel grind on an opposing side of the body, the first and second bevel grinds converge with one another to define a first forward cutting edge of a penetrating tip of the first tip portion.

6 . The biopsy needle of claim 5 , wherein the first forward cutting edge is substantially perpendicular to the longitudinal axis of the body.

7 . The biopsy needle of claim 5 , wherein the first and second bevel grinds define first and second angles, respectively, relative to an outer surface of the body.

8 . The biopsy needle of claim 7 , wherein the first and second angles are in the range of 5 to 25 degrees.

9 . The biopsy needle of claim 8 , wherein the first and second angles are the same.

10 . The biopsy needle of claim 5 , wherein the first set of angular bevel grinds comprises a back-cut bevel grind defining a substantially planar surface adjacent to the penetrating tip and defining a back-cut angle relative to an outer surface of the body and oblique to the outer surface of the body and the first and second bevel grinds.

11 . The biopsy needle of claim 11 , wherein the back-cut angle is 30 degrees.

12 . The biopsy needle of claim 4 , wherein the second set of angular bevel grinds comprises a third bevel grind on one side of the body and a fourth bevel grind on an opposing side of the body, the third and fourth bevel grinds converge with one another to define a second forward cutting edge of a penetrating tip of the second tip portion.

13 . The biopsy needle of claim 12 , wherein the second forward cutting edge defines an oblique angle relative to the outer surface of the body, wherein the angle is in the range of 10 to 45 degrees.

14 . The biopsy needle of claim 12 , wherein the third and fourth bevel grinds define third and fourth angles, respectively, relative to an outer surface of the body.

15 . The biopsy needle of claim 14 , wherein the third and fourth angles are in the range of 15 to 60 degrees.

16 . The biopsy needle of claim 14 , wherein the third and fourth angles are the same.

17 . The biopsy needle of claim 4 , wherein the first set of bevel grinds comprises a first bevel grind converging with a second bevel grind to form a penetrating tip of the first tip portion and the second set of bevel grinds comprises a third bevel grind converging with a fourth bevel grind to form a penetrating tip of the second tip portion, wherein the first and third bevel grinds are one half of the body and intersect one another along a first intersection line and the second and fourth bevel grinds are on the other half of the body and intersect one another along a second intersection line.

18 . The biopsy needle of claim 17 , wherein the distal end further comprises:
a first cutting edge extending from the first intersection line to the penetrating tip of the first tip portion; a second cutting edge extending from the first intersection line to the penetrating tip of the second tip portion; a third cutting edge extending from the second intersection line to the penetrating tip of the first tip portion; and a fourth cutting edge extending from the second intersection line to the penetrating tip of the second tip portion; wherein each of the cutting edges is configured to excise tissue upon contact therewith.

19 . The biopsy needle of claim 1 , further comprising a section of the body adjacent to the distal end having enhanced echogenicity or acoustic reflection.

20 . The biopsy needle of claim 1 , further comprising a collet surrounding a portion of the body and having a diameter sufficient to prevent the body from entirely passing through a distal end of a sheath of a biopsy device.

Assignees

• Covidien Lp

Inventors

• Mcweeney John O
• Campbell Eugene
• Gumustop Bora

Classifications

• A61B10/0266 Primary

  means for severing sample · CPC title

• A61B8/0841

  for locating instruments · CPC title

• A61B10/0233

  Pointed or sharp biopsy instruments · CPC title