Dual Action Aspiration Biopsy Needle

• US 20050090765A1
• Filed: 01/12/2005
• Published: 04/28/2005
• Est. Priority Date: 08/09/2001
• Status: Abandoned Application

• Current Assignee: Medical Device Technologies, Inc. (Angiotech Pharmaceuticals Incorporated)
• Original Assignee: Biopsy Sciences LLC
• Inventors: Fisher, John S.
• Application Number:
  US10/905,599
• Publication Number:
  US 20050090765A1
• Time in Patent Office: Days
• US Class Current: 600/570
• CPC Class Codes: A61B 10/0266 means for severing sample
• CPC Class Codes: A61B 10/0275 with sample notch, e.g. on the side of inner stylet
• CPC Class Codes: A61B 10/0283 with vacuum aspiration, e.g. caused by retractable plunger or by connected syringe A61B10/025, A61B10/0266 take precedence
• CPC Class Codes: A61B 10/04 Endoscopic instruments

Abstract

A dual action biopsy needle scrapes tissue of cellular thickness from a lesion during proximal-to-distal travel of the needle along its longitudinal axis of symmetry. A first sharp edge, formed by a beveled distal end of the needle, scrapes tissue during proximal-to-distal travel of the needle. A transversely disposed slot formed in the needle near the first sharp edge provides a second sharp edge. A bottom of the slot is proximal to the opening of the slot. The second sharp edge also scrapes tissue during proximal-to-distal travel of the needle. The second sharp edge is coincident with an exterior surface of the needle. A vacuum pulls the scraped cellular material into the lumen of the needle.

Claims

1. An aspiration biopsy needle, comprising:

a needle of elongate, hollow construction having a proximal end and a beveled distal end;

said needle having a uniform diameter along an extent of said needle;

said beveled distal end being open and therefore forming a first sharp edge adapted to scrape cellular material when said needle is inserted into tissue, said needle being displaced from a proximal to a distal position during insertion;

a slot formed in said needle near said beveled distal end;

said slot being transversely disposed relative to a longitudinal axis of said needle;

said slot also being angled relative to a transverse axis of said needle such that a bottom of said slot is positioned proximal to an opening of said slot;

said opening of said slot being in open communication with an exterior surface of said needle;

said slot including a second sharp edge adapted to scrape tissue of cellular size when said needle is displaced from a proximal position to a distal position;

said second sharp edge being flush with said external surface of said needle;

means for communicating a vacuum to said proximal end of said needle so that cellular material removed by said first sharp edge and said second sharp edge during proximal-to-distal travel of said needle is pulled into a lumen of said needle; and

said needle being configured to deposit said cellular material from said lumen onto a slide to be stained and subjected to microscopic inspection in the absence of any need to mechanically slice said cellular material.

2. The needle of claim 1, wherein said slot has a circumferential extent of about one half the circumference of said needle.

3. The needle of claim 1, wherein a material to which cellular material clings is applied to said first and second sharp edges.

4. An aspiration biopsy needle, comprising:

a needle of elongate, hollow construction having a proximal end and a beveled distal end;

said needle having a uniform diameter along an extent of said needle;

said beveled distal end being open and therefore forming a first sharp edge adapted to scrape cellular material when said needle is inserted into tissue, said needle being displaced from a proximal to a distal position during insertion;

a slot formed in said needle near said beveled distal end;

said slot being transversely disposed relative to a longitudinal axis of said needle;

said slot also being angled relative to a transverse axis of said needle such that a bottom of said slot is positioned proximal to an opening of said slot;

said opening of said slot being in open communication with an exterior surface of said needle;

said slot including a second sharp edge adapted to scrape tissue of cellular size when said needle is displaced from a proximal position to a distal position;

said second sharp edge being elevated relative to said external surface of said needle;

means for communicating a vacuum to said proximal end of said needle so that cellular material removed by said first sharp edge and said elevated second sharp edge during proximal-to-distal travel of said needle is pulled into a lumen of said needle; and

said needle being configured to deposit said cellular material from said lumen onto a slide to be stained and subjected to microscopic inspection in the absence of any need to mechanically slice said cellular material.

5. The needle of claim 4, wherein said slot has a circumferential extent of about one half the circumference of said needle.

6. The needle of claim 4, wherein a material to which cellular material clings is applied to said first and second sharp edges.

7. An aspiration biopsy needle, comprising:

a needle of elongate, hollow construction having a proximal end and a beveled distal end;

said needle having a uniform diameter along an extent of said needle;

said beveled distal end being open and therefore forming a first sharp edge adapted to scrape cellular material when said needle is inserted into tissue, said needle being displaced from a proximal to a distal position during insertion;

a slot formed in said needle near said beveled distal end;

said slot being transversely disposed relative to a longitudinal axis of said needle;

said slot also being angled relative to a transverse axis of said needle such that a bottom of said slot is positioned proximal to an opening of said slot;

said opening of said slot being in open communication with an exterior surface of said needle;

said slot including a second sharp edge adapted to scrape tissue of cellular size when said needle is displaced from a proximal position to a distal position;

said second sharp edge being recessed relative to said external surface of said needle;

means for communicating a vacuum to said proximal end of said needle so that cellular material removed by said first sharp edge and said recessed second sharp edge during proximal-to-distal travel of said needle is pulled into a lumen of said needle; and

said needle being configured to deposit said cellular material from said lumen onto a slide to be stained and subjected to microscopic inspection in the absence of any need to mechanically slice said cellular material.

8. The needle of claim 7, wherein said slot has a circumferential extent of about one half the circumference of said needle.

9. The needle of claim 7, wherein a material to which cellular material clings is applied to said first and second sharp edges.