Exchangeable core biopsy needle

Patent metadata

Field	Value
Publication number	US-10159470-B2
Application number	US-201514802039-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 30, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

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 radially opposing one another. The first tip portion has a length greater than the second tip portion, thereby resulting in an increased surface area of a curvilinear cutting edge extending from the first tip portion to the second tip portion. Additionally, each of the first and second tip portions defines a point configured to pierce the tissue to be sampled and further direct tissue towards the lumen of the body to be excised by the cutting edge upon contact therewith.

First claim

What is claimed is:

1. A biopsy needle comprising:
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 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, such that the first tip portion is configured to contact and engage tissue to be sampled prior to the second tip portion,
wherein the first tip portion of the needle is formed from a first set of angular bevel grinds comprising first and second angular bevel grinds oblique to the longitudinal axis of the body,
wherein the second tip portion of the needle is formed from a second set of angular bevel grinds comprising third and fourth angular bevel grinds oblique to the longitudinal axis of the body,
wherein the first and third angular bevel grinds form first and second distinct curved cutting edges on a first side of the body, and
wherein the second and fourth angular bevel grinds form third and fourth distinct curved cutting edges on a second side of the body opposite the first side.

2. The biopsy needle of claim 1 , wherein the first and second tip portions radially oppose one another.

3. The biopsy needle of claim 1 , wherein the first set of angular bevel grinds comprises first and second angles oblique to the longitudinal axis of the body and a first back-cut angle relative to an outer surface of the body, the first back-cut angle for providing a smooth needle passage during needle insertion and withdrawal through an outer sheath during a biopsy procedure.

4. The biopsy needle of claim 3 , wherein the first and second angles are in the range of 5 to 15 degrees.

5. The biopsy needle of claim 3 , wherein the first back-cut angle is in the range of 15 to 70 degrees.

6. The biopsy needle of claim 3 , wherein the first and second angles are the same.

7. The biopsy needle of claim 1 , wherein the second set of angular bevel grinds comprises third and fourth angles oblique to the longitudinal axis of the body.

8. The biopsy needle of claim 7 , wherein the second set of angular bevel grinds further comprises a second back-cut angle relative to an outer surface of the body, the second back-cut angle for providing a smooth needle passage during needle insertion and withdrawal through an outer sheath during a biopsy procedure.

9. The biopsy needle of claim 7 , wherein the third and fourth angles are in the range of 20 to 30 degrees.

10. The biopsy needle of claim 7 , wherein the third and fourth angles are the same.

11. The biopsy needle of claim 7 , wherein the first and second angles of the first set of angular bevel grinds are less than the third and fourth angles of the second set of angular bevel grinds.

12. The biopsy needle of claim 1 , wherein the distal end further comprises at least one curvilinear cutting edge extending from the first tip portion to the second tip portion, the cutting edge configured to excise tissue upon contact therewith.

13. The biopsy needle of claim 1 , wherein the lumen is configured to communicate a vacuum from the proximal end to the distal end of the body to provide a suction force to the tissue to be sampled.

14. The biopsy needle of claim 1 , wherein each of the first and second tip portions defines a point configured to pierce the tissue to be sampled and further direct tissue towards the lumen of the body.

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

16. 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.

17. The biopsy needle of claim 1 , wherein the body has an outer diameter in the range of 10-gauge to 30-gauge.

18. The biopsy needle of claim 1 , wherein the needle is comprised of a material selected from the group consisting of nitinol, cobalt chrome, stainless steel, a metal alloy, and combinations thereof.

Assignees

• Covidien Lp

Inventors

• Mcweeney John O
• Tully Stephen
• Campbell Eugene
• Gumustop Bora
• Tinkham Brian

Classifications

• A61B10/0266 Primary

  means for severing sample · CPC title

• A61B10/0233

  Pointed or sharp biopsy instruments · CPC title

• A61B2010/0225

  for taking multiple samples · CPC title

• A61B10/04

  Endoscopic instruments, e.g. catheter-type instruments · CPC title

• A61B10/0283

  with vacuum aspiration, e.g. caused by retractable plunger or by connected syringe (A61B10/025, A61B10/0266 take precedence) · CPC title