FLUSH CUT BIOPSY NEEDLE ASSEMBLY AND METHOD OF USE

• US 20150201917A1
• Filed: 01/16/2015
• Published: 07/23/2015
• Est. Priority Date: 01/17/2014
• Status: Active Application

• Current Assignee: Merit Medical Systems, Inc.
• Original Assignee: Merit Medical Systems, Inc.
• Inventors: Snow, Jeremy W.
• Granted Patent: US 10,568,611 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 10/0266 means for severing sample
• CPC Class Codes: A61B 2010/0208 Biopsy devices with actuators, e.g. with triggered spring mechanisms

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.

Claims

1. A biopsy needle assembly configured for use with a tissue biopsy device, the biopsy needle assembly comprising:

an 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 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.

2. The biopsy needle assembly of claim 1, 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.

3. The biopsy needle assembly of claim 2, wherein the cutting member further comprises a spiral cut disposed proximal of the one or more sectioning elements, wherein the spiral cut is configured to longitudinally compress in response to relative displacement of the outer tubular member in relation to the cutting member.

4. The biopsy needle assembly of claim 3, wherein the compression of the spiral cut is configured to rotate the one or more sectioning elements around the central axis of the cutting member.

5. The biopsy needle assembly of claim 2, wherein the 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 outer tubular member in relation to the cutting member.

6. The biopsy needle assembly of claim 5, wherein an inside surface of the distal end portion of the 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 outer tubular member.

7. The biopsy needle assembly of claim 2, wherein a portion of at least one of the sectioning elements is elastically deformable inward toward the central axis of the cutting member.

8. 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 outer tubular member.

9. 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 outer tubular member.

10. 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.

11. 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 a tissue sample;

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 a distal end portion of the second elongate member; and

an actuator configured to actuate at least the second elongate member and the third elongate member such that the tissue sample is severed.

12. The device of claim 11, wherein a distal end portion of the third elongate member is configured to contract toward a central axis of the third elongate member to sever the second portion of the tissue sample.

13. The device of claim 12, wherein the distal end portion of the second elongate member is configured to deflect the contraction of the distal end portion of the third elongate member.

14. The device of claim 11, wherein the third elongate member is further configured to extract the severed tissue sample from the body tissue.

15. A method of obtaining a tissue sample, comprising:

advancing a stylet into a body tissue;

displacing an outer tubular member with respect to the stylet such that a distal end portion of the outer tubular member severs a first portion of a tissue sample; and

displacing a cutting member with respect to the 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 outer tubular member.

16. The method of claim 15, further comprising:

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.

17. The method of claim 16, further comprising displacing the distal end portion of the outer tubular member distally relative to the distal end portion of the stylet such that the distal end portion of the outer tubular member is disposed a predetermined distance into the body tissue.

18. The method of claim 17, further comprising displacing a distal end portion of the cutting member to a position at or adjacent the distal end portion of the outer tubular member.

19. The method of claim 17, further comprising engaging a distal end portion of the cutting member with the distal end portion of the outer tubular member such that the distal end portion of the cutting member is configured to sever the second portion of the tissue sample.

20. The method of claim 15, wherein severing the second portion of the tissue sample comprises displacing at least a portion of the distal end portion of the cutting member toward a central axis of the cutting member.

21. The method of claim 15, further comprising retracting each of the stylet, the outer tubular member, and the cutting member from the body tissue such that the tissue sample is extracted from the body tissue, wherein relative positions of each of the stylet, the outer tubular member, and the cutting member are substantially maintained upon the retraction.