Flush cut biopsy needle assembly and method of use

Patent metadata

Field	Value
Publication number	US-10568611-B2
Application number	US-201514598457-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 17, 2014
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

A biopsy needle assembly configured for use with a tissue biopsy device is disclosed. The biopsy needle assembly may be configured to be advanced to a predetermined tissue sample, sever the tissue sample, and extract the tissue sample from a body tissue of a patient. The biopsy needle assembly may be further configured to minimize or eliminate the length of dead space at or adjacent a position of the tissue sample extraction.

First claim

The invention claimed is:

1. A biopsy needle assembly configured for use with a tissue biopsy device, the biopsy needle assembly comprising:
a linear outer tubular member comprising a distal end portion configured to sever a first portion of a tissue sample; and
a cutting member slidably disposed within the linear outer tubular member, wherein the cutting member comprises a distal end portion, and wherein the distal end portion of the cutting member is configured to displace inward to sever a second portion of the tissue sample; and
an actuator configured to displace the cutting member relative to the linear outer tubular member,
wherein the distal end portion of the cutting member further comprises one or more sectioning elements, and wherein displacement of a portion of at least one of the sectioning elements toward a central axis of the cutting member is configured to sever the second portion of the tissue sample,
wherein the cutting member further comprises a spiral cut disposed proximal of the one or more sectioning elements, wherein the spiral cut is a single continuous smooth spiral cut, wherein the spiral cut is configured to longitudinally compress during actuation of the actuator of the biopsy needle assembly, and
wherein the spiral cut is configured to rotate the one or more sectioning elements around the central axis of the cutting member relative to a proximal end portion of the cutting member an amount between one degree and 15 degrees when the spiral cut is compressed from an uncompressed state to a compressed state.

2. The biopsy needle assembly of claim 1 , wherein the linear outer tubular member is configured to displace the portion of the at least one of the sectioning elements toward the central axis of the cutting member in response to relative displacement of the linear outer tubular member in relation to the cutting member caused by the actuation of the actuator of the biopsy needle assembly.

3. The biopsy needle assembly of claim 2 , wherein an inside surface of the distal end portion of the linear outer tubular member comprises one or more inwardly projecting protrusions, and wherein the one or more protrusions are configured to displace the portion of the at least one of the sectioning elements inward toward the central axis of the cutting member when the cutting member is displaced distally relative to the linear outer tubular member caused by the actuation of the actuator of the biopsy needle assembly.

4. The biopsy needle assembly of claim 1 , wherein the portion of the at least one of the sectioning elements is elastically deformable inward toward the central axis of the cutting member.

5. The biopsy needle assembly of claim 1 , wherein the cutting member is configured to sever the second portion of the tissue sample at or adjacent a distal-most point of the distal end portion of the linear outer tubular member.

6. The biopsy needle assembly of claim 1 wherein the cutting member is configured to sever the second portion of the tissue sample at a position less than 3 mm from a distal-most point of the distal end portion of the linear outer tubular member.

7. The biopsy needle assembly of claim 1 , further comprising a stylet disposed within the cutting member, wherein the stylet comprises a distal end portion configured to facilitate advancement of the biopsy needle assembly through a body tissue.

8. The biopsy needle assembly of claim 1 , wherein the spiral cut is configured to compress evenly laterally.

9. The biopsy needle assembly of claim 1 , wherein the spiral cut is configured to compress evenly longitudinally.

10. The biopsy needle assembly of claim 1 , wherein the linear outer tubular member extends from a proximal end to a distal end of a longitudinal axis.

11. The biopsy needle assembly of claim 1 , wherein the one or more sectioning elements comprise a serrated lateral surface.

12. A tissue biopsy device configured to obtain a tissue sample, comprising:
a first elongate member configured to be advanced into a body tissue;
a second elongate member movably disposed around the first elongate member and configured to sever a first portion of the tissue sample, wherein the second elongate member extends from a proximal terminal end to a distal terminal end along a longitudinal axis;
a third elongate member movably disposed within the second elongate member and configured to sever a second portion of the tissue sample at or adjacent a distal-most point of the distal terminal end of the second elongate member;
wherein the third elongate member further comprises a spiral cut, wherein the spiral cut is configured to longitudinally compress during actuation of the tissue biopsy device; and
wherein the third elongate member is configured such that axial movement of a proximal terminal end of the third elongate member causes the spiral cut to compress, and
wherein upon compression from an uncompressed state to a compressed state a distal terminal end of the third elongate member is configured to rotate around a central axis of the third elongate member an amount between one degree and 15 degrees with respect to the proximal terminal end of the third elongate member; and
an actuator configured to actuate at least the biopsy device to displace the second elongate member relative to the third elongate member such that at least the second portion of the tissue sample is severed.

13. The device of claim 12 , wherein a distal end portion of the third elongate member is configured to contract toward the central axis of the third elongate member to sever the second portion of the tissue sample.

14. The device of claim 13 , wherein a distal end portion of the second elongate member is configured to deflect the contraction of the distal end portion of the third elongate member.

15. The device of claim 12 , wherein the third elongate member is further configured to extract at least a portion of the second portion of the tissue sample from the body tissue.

16. A method of obtaining a tissue sample, comprising:
advancing a stylet into a body tissue;
displacing a linear outer tubular member with respect to the stylet such that a distal end portion of the linear outer tubular member severs a first portion of the tissue sample; and
displacing a cutting member with respect to the linear outer tubular member such that the cutting member severs a second portion of the tissue sample at or adjacent a distal-most point of the distal end portion of the linear outer tubular member,
wherein the cutting member further comprises a spiral cut, wherein the spiral cut is configured to longitudinally compress during the displacement of the cutting member,
wherein axial movement of a proximal terminal end of the cutting member causes the spiral cut to compress, and
wherein upon compression from an uncompressed state to a compressed state a distal terminal end of the cutting member rotates between one degree and 15 degrees with respect to the proximal terminal end of the cutting member, and
wherein the tissue sample comprises the first portion of the tissue sample and the second portion of the tissue sample.

17. The method of claim 16 , wherein the advancing the stylet into the body tissue further comprises:
determining the tissue sample to obtain; and
disposing a distal end portion of the stylet to a position at or adjacent a proximal end portion of the tissue sample.

18. The method of claim 16 , wherein the displacing the linear outer tubular member with respect to the stylet further comprises displacing the distal end portion of the linear

Assignees

• Merit Medical Systems Inc

Inventors

• Snow Jeremy W

Classifications

• A61B2010/0208

  Biopsy devices with actuators, e.g. with triggered spring mechanisms · CPC title

• A61B10/0266 Primary

  means for severing sample · CPC title