CORE BIOPSY ARRANGEMENT

• US 20110105949A1
• Filed: 06/23/2009
• Published: 05/05/2011
• Est. Priority Date: 06/25/2008
• Status: Active Grant

• Current Assignee: NeoDynamics AB
• Original Assignee: NeoDynamics AB
• Inventors: Wiksell, Hans
• Granted Patent: US 9,216,011 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 10/0283 with vacuum aspiration, e.g. caused by retractable plunger or by connected syringe A61B10/025, A61B10/0266 take precedence
• CPC Class Codes: A61B 2010/0208 Biopsy devices with actuators, e.g. with triggered spring mechanisms
• CPC Class Codes: A61B 2018/00196 reciprocating lengthwise
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension

Abstract

A core biopsy arrangement for taking a tissue sample from a human or animal tissue, preferably from a tumour or a suspected tumour, includes a needle holder member provided with a tissue sampling needle, a longitudinal movement element adapted to apply a longitudinal movement to the needle, wherein the movement of the needle is a reciprocating movement having a stroke length L, wherein the forward movement is faster than the retracting movement, and wherein the reciprocating movement is initiated when the distal end of the needle is subjected to a force in the longitudinal direction.

Claims

1. Core biopsy arrangement for taking a tissue sample from a human or animal tissue, preferably from a tumour or a suspected tumour, comprising a needle holder member provided with a tissue sampling needle, a longitudinal movement means adapted to apply a longitudinal movement to the needle, characterized in that the movement of the needle is a reciprocating movement having a stroke length L, wherein the forward movement is faster than the retracting movement, and wherein the reciprocating movement is initiated when the distal end of the needle is subjected to a force in the longitudinal direction.

2. Core biopsy arrangement according to claim 1, wherein the stroke length L of the needle is variable.

3. Core biopsy arrangement according to claim 1, wherein the stroke length L is preferably linearly dependent of the force in the longitudinal and proximal direction of the needle such that when a lower force is applied the stroke length L is minimal (close to zero) and when a higher force is applied the stroke length L is maximal.

4. Core biopsy arrangement according to claim 1, wherein the arrangement comprises a cylinder provided with a plunger adapted to move back and forth in said cylinder in dependence of applied air pressure pulses, said plunger is provided with a plunger rod adapted to cooperate with the proximal end of the needle when a force in the longitudinal and proximal direction is applied to said needle.

5. Core biopsy arrangement according to claim 1, wherein the forward movement is an iterative movement and the retracting movement is then substantially zero.

6. Core biopsy arrangement according to claim 5, wherein the needle is gradually and stepwise expelled from the needle holder member during the iterative forward movement.

7. Core biopsy arrangement according to claim 1, wherein the movement is defined by a saw tooth movement, wherein the faster forward movement of the needle is discontinued instantaneously and followed by the slower retracting movement, wherein the velocities of the needle during the respective movements are essentially constant.

8. Core biopsy arrangement according to claim 1, wherein the velocity gradually increases during the forward movement and during the retracting movement, respectively.

9. Core biopsy arrangement according to claim 1, wherein the arrangement further comprises control means adapted to control the longitudinal movement.

10. Core biopsy arrangement according to claim 1, wherein the movement is applied when the needle is penetrating the tissue.

11. Core biopsy arrangement according to claim 1, wherein the movement is activated automatically.

12. Core biopsy arrangement according to claim 1, wherein the movement is activated manually.

13. Core biopsy arrangement according to claim 1, wherein the needle is a coarse needle, preferably having a diameter of 1.2-3.2 mm.

14. Core biopsy arrangement according to claim 1, wherein the length of the forward movement is 2-5 mm, preferably 3-4 mm.

15. Core biopsy arrangement according to claim 1, wherein the mean velocity of the forward movement is in the range of 8-80 m/s, preferably approximately 30 m/s.

16. Core biopsy arrangement according to claim 1, wherein the arrangement further comprises a suction means adapted to remove a tissue sample from the distal end of the needle through a canal inside the needle by providing a suction force that enables transportation of the tissue sample, via a canal, towards the suction means.

17. Core biopsy arrangement according to claim 16, wherein a rod is provided in said canal that is adapted to be removed upon tissue sampling.

18. Core biopsy arrangement according to claim 1, wherein the movement is described by a Fourier series:

19. Core biopsy arrangement according to claim 1, wherein at least three terms of the Fourier series are used.