Device for cutting and aspirating tissue

• US 9,956,115 B2
• Filed: 01/20/2014
• Issued: 05/01/2018
• Est. Priority Date: 02/04/2013
• Status: Active Grant

• Current Assignee: Geuder AG (Geuder Group)
• Original Assignee: Geuder AG (Geuder Group)
• Inventors: Rieger, Frank, Draheim, Rene, Frauenfeld, Dieter, Geuder, Volker
• Primary Examiner(s): SZPIRA, JULIE ANN
• Application Number:
  US14/759,350
• Publication Number:
  US 20150335485A1
• Time in Patent Office: 1,562 Days
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/320028 with reciprocating movements
• CPC Class Codes: A61F 9/007 Methods or devices for eye surgery
• CPC Class Codes: A61F 9/00763 with rotating or reciprocating cutting elements, e.g. concentric cutting needles atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016

Abstract

The present invention relates to a device for cutting and aspirating tissue from the human or animal body, in particular for use in vitrectomy, epiretinal membrane peeling, etc., with an outer tube (1), and with an inner tube (2) which is movable to and fro and concentrically in the outer tube (1) with slight play, wherein the outer tube (1) is closed at the free end and has, near the free end, at least one lateral opening (3) with at least one inner cutting edge (5), wherein the inner tube (2) is open at the free end and there has an outer cutting edge (4), and wherein the cutting edges cooperate in a cutting action during the movement of the inner tube (2) relative to the outer tube (1), advantageously characterized by a shaping measure in or on the outer tube (1) and/or in or on the inner tube (2), whereby the inner tube (2), at least in the area of the lateral opening (3), runs in the outer tube (1) with at least slight pretensioning.

Claims

1. A device for cutting and aspirating tissue from the human or animal body, said device having a longitudinal axis and comprising:

an outer tube (1); and

an inner tube (2) arranged concentrically inside the outer tube (1), with little play, in a manner allowing sliding back and forth,

wherein;

the outer tube (1) is closed on the free end thereof, and has at least one lateral opening (8), the same having at least one inner cutting edge (5) close to the free end,

the inner tube (2) is open on the free end thereof, and has an outer cutting edge (4),

the cutting edges (4, 5) work together by cutting when the inner tube (2) slides with respect to the outer tube (1), with a shaping measure performed at least one of in or on the inner tube (2),

the inner tube (2) runs in the outer tube (1) with at least a small amount of pre-tensioning, at least in the region of the lateral opening (3),

the inner tube (2) is at least one of bent or is given a bending with respect to the longitudinal axis in such a manner that the cutting edges pass by each other under at least a small amount of pre-tensioning when the inner tube (2) glides back and forth in the outer tube (1), and

the inner tube (2) has two bendings (10, 11) each oriented in a different direction, such that an outer wall of the inner tube (2) and an inner wall of the outer tube (1) are oriented at least nearly parallel relative to one other and the longitudinal axis, at least in a frontal region of the device adjacent the free ends of the inner and outer tubes (1, 2).

2. A device according to claim 1, wherein a measure performed on the outer tube (1), whereby the inner tube (2) runs in the outer tube (1) with at least a small amount of pre-tensioning, at least in the region of the lateral opening (3).

3. A device according to claim 1, wherein the outer tube (1) has a second lateral opening (8), near to the first lateral opening (8), with one or two inner cutting edges (5).

4. A device according to claim 1, wherein:

the lateral opening (6) of the inner tube (2) is positioned near to the free, open end of the inner tube (2), and

the lateral opening (6) is provided with one or two outer cutting edges (4, 7).

5. A device according to claim 4, wherein a strut which is small/thin is constructed between the open end and the lateral opening (6) of the inner tube (2).

6. A device according to claim 4, wherein the lateral opening (6) of the inner tube (2) has at least the same flow cross-section as the open end of the inner tube (2).

7. A device according to claim 4, wherein the lateral opening (6) of the inner tube (2) has at least the same flow cross-section as the at least one lateral opening (8) in the outer tube (1).

8. A device according to claim 1, wherein, as the shaping measure, the inner wall of the outer tube (1) is elevated inward, approximately opposite the lateral opening (8), thereby producing a guide region.

9. A device according to claim 1, wherein, as the shaping measure, the outer wall of the inner tube (2) is elevated outward, preferably in a region opposite the lateral opening (6), thereby producing a guide region.

10. A device according to claim 8, wherein the guide region results from, in the case of the outer tube (1), a deformation oriented inward from the outside, and/or, in the case of the inner tube (2), from a deformation oriented outward from the inside.

11. A device according to claim 8, wherein the guide region is constructed as, in the case of the outer tube (1), an addition of material to the inside thereof, and/or, in the case of the inner tube (2), as an addition of material to the outside thereof.

12. A device according to claim 1, wherein, as the shaping measure, the outer tube (1) is bent and/or given a bending with respect to the longitudinal axis, before the opening (8), in such a manner that the cutting edges pass by each other under at least a small amount of pre-tensioning when the inner tube (2) slides back and forth in the outer tube (1).

13. A device according to claim 1, wherein the bending (10) which is remote from the free end is 1°

to 2°

, and the bending (11) closer than the bending (10) to the free end is 2°

to 5°

.

14. A device according to claim 1, wherein the bending (10) which is remote from the free end is 1 mm to 2 mm before the free end, and the bending (11) closer than the bending (10) to the free end is in the region of the lateral opening (6) of the inner tube (2).

15. A device according to claim 1, wherein the bending (11) closer than the bending (10) to the free end is 0.1 mm to 0.5 mm before the free end.

16. A device according to claim 1, wherein the device is configured for use at least one of in vitrectomies or for retinal peeling.

17. A device according to claim 1, wherein:

the different directions in which each of the two bendings (10, 11) is oriented are opposing directions; and

the inner wall of the outer tube (1) and the outer wall of the inner tube (2) diverge relative to one another between the two bendings (10, 11).

18. A device according to claim 1, wherein the inner wall of the outer tube (1) and the outer wall of the inner tube (2) are not parallel relative to one another between the two bendings (10, 11).