COAXIAL INCISIONAL FULL-CORE BIOPSY NEEDLE

• US 20130131548A1
• Filed: 01/18/2013
• Published: 05/23/2013
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Inventors: McGhie, Thomas W., Hardert, Michael W.
• Granted Patent: US 9,101,347 B2
• Time in Patent Office: Days
• US Class Current: 600/567
• CPC Class Codes: A61B 10/0233 Pointed or sharp biopsy instruments
• 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 17/0218 for minimally invasive surgery A61B17/0281, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/0482 Needle or suture guides guides for drills, pins or wire A61B17/17; for puncturing needles A61B17/3403
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means

Abstract

Among other things, there are disclosed embodiments of full-core biopsy needles having an outer needle component and a middle cannula through a lumen in the outer component, through which a mandrel may be placed. The outer component includes an internal boss that reduces its internal diameter, and the cannula includes fingers that extend distally. When the needle is inserted for biopsy, tissue enters the outer component and cannula. Moving the cannula forward causes the fingers to engage a surface of the internal boss, resulting in the fingers curving into the tissue. The fingers pinch the tissue while reducing or eliminating compression of the sample to provide an easier removal of the tissue from adjacent tissue, as well as providing a block or backstop keeping the tissue within the needle. Gaps are provided between the fingers to further reduce damage to the tissue sample.

Claims

1. A full-core biopsy needle, comprising:

an outer tubular component having a body portion, a tip portion and a lumen through said body and tip portions, said tip portion having a conical tapered outer surface extending entirely around the longitudinal axis of the component, said component having a portion joining said body portion and said tip portion that is rounded externally and forms a boss within said lumen, said lumen having a first diameter proximal of said boss and a second smaller diameter distal of said boss, said lumen with said second smaller diameter extending through said tip; and

a middle cannula having a body portion and a tip portion, said tip portion having a plurality of fingers, at least a first and second of said fingers being separated by a gap, said middle cannula being within said lumen of said component, wherein said component and said cannula have a first relative position with said fingers proximal of said boss, and said cannula adapted to be moved distally with respect to said component into a second relative position, said second relative position being the limit of possible distal movement of said cannula with respect to said component and being a position in which at least said first and second fingers are deflected inward by said boss, wherein in said second relative position at least a portion of said first and second fingers point toward each other but do not close the entirety of said gap.

2. The needle of claim 1, further comprising an internal mandrel extending through said middle cannula and being slidable with respect to said cannula and said component between a first limit in which a tip portion of said mandrel extends from said tip of said component and a second limit in which the tip portion of said mandrel is proximal of said fingers of said cannula by a predetermined distance prior to movement of said fingers with respect to said outer component.

3. The needle of claim 1, wherein said boss and said rounded external part are substantially radially aligned.

4. The needle of claim 1, wherein said fingers each have a respective external surface that is parallel to the longitudinal axis of said cannula in said second relative position.

5. The needle of claim 1, wherein said first and second fingers have respective edges that together form a continuous substantially part-elliptical path.

6. The needle of claim 1, wherein said first and second fingers have distal linear or curvilinear edges.

7. The needle of claim 1, wherein said boss includes a surface that is substantially perpendicular to the longitudinal axis of said outer component.

8. The needle of claim 1, wherein said boss includes a surface that angled at approximately 45 degrees to the longitudinal axis of said outer component.

9. The needle of claim 1, wherein said gap is substantially elliptical and said first and second fingers each have respective distal ends and proximal portions, a vertex of the substantially elliptical gap being between said fingers in said proximal portions, and when said outer component and said cannula are in said second relative position a portion of said gap adjacent said vertex remains open.

10. The needle of claim 1, wherein in said second relative position said first and second fingers contact each other and a portion of said gap is open between them.

11. The needle of claim 10, wherein said first and second fingers have respective distal ends, and said first and second fingers contact each other at or adjacent to said distal ends.

12. The needle of claim 1, wherein said first and second fingers are smaller than at least one gap between them.

13. A full-core biopsy needle, comprising:

an outer tubular component having a body portion, a transition portion, and a tip portion, said body portion having a substantially constant inner and outer diameter, said transition portion curving inward from said body portion inner and outer diameter and forming an external rounded surface and an internal boss, said tip portion having a constant inner diameter that is smaller than said body portion inner diameter and an outer surface that tapers so that said tip has a first thickness adjacent to the transition portion and a distal edge, said outer component having a lumen through said body portion, said transition portion and said tip portion; and

a cannula within said lumen of said outer component and having a proximal portion and a distal portion, said proximal portion having substantially constant inner and outer diameters, said distal portion having at least a first and second finger separated by a substantially elliptical gap,

wherein said component and said cannula have a first relative position with said fingers proximal of said boss, and said cannula and said component being adapted to be moved with respect to each other into a second relative position, said second relative position being the limit of possible distal location of said cannula with respect to said component and being a position in which at least said first and second fingers are deflected inward by said boss, wherein in said second relative position at least a portion of said first and second fingers point toward each other but do not close the entirety of said gap.

14. The needle of claim 13, wherein in said second relative position said fingers do not contact each other.

15. The needle of claim 13, wherein said cannula has at least four fingers equidistantly spaced around said cannula.

16. The needle of claim 13, wherein said boss is substantially perpendicular to the longitudinal axis of said outer component, and said boss forces said fingers in a direction substantially perpendicular to the longitudinal axis.

17. The needle of claim 16, wherein said inner diameter of said outer component is surrounded by a wall, and said wall curves into said boss.

18. The needle of claim 13, wherein said fingers each have a distal end, and wherein force is applied by said boss on said fingers initially solely at said distal end.

19. The needle of claim 13, wherein said inward deflection of said fingers does not compress tissue within said fingers around the whole diameter of such tissue.

20. The needle of claim 19, wherein said fingers each have a distal end edge, and substantially all compression on tissue within said fingers is exerted by said distal end edges.