Ophthalmic cutting instruments having integrated aspiration pump

Patent metadata

Field	Value
Publication number	US-11241335-B2
Application number	US-202016778755-A
Country	US
Kind code	B2
Filing date	Jan 31, 2020
Priority date	Feb 1, 2019
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A device for extracting lens material from an eye including a distal, disposable portion releasably coupleable to a proximal, reusable portion. The disposable portion includes a cutting tube having a distal cutting tip and an inner lumen having an open distal end. The disposable portion includes an aspiration pump fluidly coupled to the inner lumen of the cutting tube and a cutting tube drive mechanism configured to oscillate the cutting tube. The reusable portion includes an aspiration pump motor configured to drive the aspiration pump and a coupler for releasably operatively coupling the pump motor to the aspiration pump. Related devices, systems, and methods are disclosed.

First claim

What is claimed is:

1. A device for extracting lens material from an eye, the device comprising:
a distal, disposable portion releasably coupleable to a proximal, reusable portion, the distal, disposable portion comprising:
a cutting tube comprising a distal cutting tip and an inner lumen, the cutting tube sized and configured to extend through an anterior chamber of the eye and to a capsular bag;
an aspiration pump housed within the disposable portion and fluidly coupled to the inner lumen of the cutting tube, wherein the aspiration pump is a linear peristaltic pump comprising a central camshaft extending longitudinally through a symmetrical double chamber pumping manifold, the central camshaft having a rotational axis that is coaxially aligned with a longitudinal axis of the distal, disposable portion; and
a cutting tube drive mechanism configured to oscillate the cutting tube,

wherein, in use, the device is configured to aspirate lens material from the capsular bag into the inner lumen; and
the proximal, reusable portion configured to remain outside of the eye, the proximal, reusable portion comprising:
an aspiration pump motor configured to drive the aspiration pump; and
a coupler for releasably operatively coupling the pump motor to the aspiration pump.

2. The device of claim 1 , wherein the aspiration pump motor rotates the central camshaft.

3. The device of claim 1 , wherein the linear peristaltic pump further comprises two tubes extending through the pumping manifold, each of the two tubes comprising a longitudinal axis that is positioned parallel with the rotational axis of the central camshaft.

4. The device of claim 3 , a first tube of the two tubes is positioned on one side of the camshaft and a second tube of the two tubes is positioned on a second, opposite side of the camshaft.

5. The device of claim 4 , wherein the linear peristaltic pump further comprises a proximal flow path and a distal flow path.

6. The device of claim 5 , wherein the proximal flow path splits into two flow paths connected on a proximal end with the two tubes within the pumping manifold.

7. The device of claim 5 , wherein the two tubes combine distal to the pumping manifold into the distal flow path.

8. The device of claim 5 , wherein the camshaft further comprises a plurality of lobed cams that work in time to drive a plurality of cam followers towards and away from the two tubes to create sequential, progressive compression of the two tubes to push a fluid volume toward the distal flow path.

9. The device of claim 8 , wherein motion of the plurality of cam followers is in a plane perpendicular to the rotational axis of the camshaft and to the longitudinal axis of the two tubes.

10. The device of claim 9 , wherein the plurality of cam followers sequentially compress the two tubes in a wave-like fashion.

11. The device of claim 9 , wherein the plurality of cam followers apply no force in a direction of the longitudinal axis of the two tube and generate little to no friction on the two tubes.

12. The device of claim 1 , further comprising an external vacuum source operatively releasably coupleable to at least one of the proximal, reusable portion and the distal, disposable portion, wherein the external vacuum source is configured to provide continuous vacuum pressure within the inner lumen.

13. The device of claim 12 , wherein the continuous vacuum pressure creates less suction force than the vacuum pressure generated by the aspiration pump of the distal, disposable portion.

14. The device of claim 1 , wherein the cutting tube drive mechanism causes oscillatory motion of the cutting tube via a mechanical hinge.

15. The device of claim 1 , wherein the cutting tube drive mechanism incorporates less than 2 nodal inflection points between a point of application of a drive force and the distal cutting tip of the cutting tube.

16. The device of claim 1 , wherein the cutting tube drive mechanism comprises a base, a rocker, and a pivot pin, the rocker being movably coupled to the base by the pivot pin and configured to rotate relative to the base around a rotational axis of the pivot pin.

17. The device of claim 16 , wherein the cutting tube extends through a center of the rocker and wherein the pivot pin is substantially aligned along the longitudinal axis of the cutting tube creating a fulcrum for the rocker.

18. The device of claim 16 , wherein the drive mechanism further comprises a piezoelectric stack and a spring stack, the piezoelectric stack and the spring stack being positioned on opposite sides of the cutting tube.

19. The device of claim 18 , wherein the spring stack creates an upward force against a first end of the rocker urging a second, opposite end of the rocker downward against the piezoelectric stack.

20. The device of claim 19 , wherein the piezoelectric stack expands under varying voltage rotating the rocker about the rotational axis of the pivot pin causing the cutting tube to move in at least one direction.

21. The device of claim 20 , wherein retraction of the piezoelectric stack allows the upward force of the spring stack against the first end of the rocker to urge the second, opposite end of the rocker downward maintaining contact with the retracting piezoelectric stack.

22. The device of claim 16 , wherein the drive mechanism further comprises a motor-driven cam and a cam follower coupled to the rocker.

23. The device of claim 16 , wherein the drive mechanism further comprises a motor and a motor shaft, the motor shaft having an offset weight configured to cause motion of the rocker as the motor shaft spins.

24. The device of claim 16 , wherein the rocker is a straight rocker and the pivot axis of the pivot pin is aligned with a plane of the rocker, the plane extending perpendicular to the longitudinal axis of the cutting tube.

25. The device of claim 16 , wherein the rocker is an offset rocker and the pivot axis of the pivot pin is positioned proximal to a plane of the rocker, the plane extending perpendicular to the longitudinal axis of the cutting tube.

26. The device of claim 1 , wherein the cutting tube drive mechanism creates a drive force applied to generate longitudinal oscillatory motion and/or torsional oscillatory motion.

27. The device of claim 26 , wherein the oscillatory motion is in an ultrasonic frequency range.

28. The device of claim 26 , wherein the oscillatory motion is in a frequency range that is less than ultrasonic.

29. The device of claim 26 , wherein a frequency of oscillation of the distal cutting tip is between about 0.5 Hz to 5000 Hz.

30. The device of claim 1 , wherein the cutting tube incorporates a non-circular cross-sectional geometry along at least a portion of its length.

31. The device of claim 30 , wherein the non-circular cross-sectional geometry comprises oval, elliptical, lentoid, tear-drop, or diamond.

32. The device of claim 1 , wherein the cutting tube incorporates at least a first tapered profile extending laterally from a central axis of the cutting tube.

33. The device of claim 1 , wherein the cutting tube has an asymmetric cross-section forming a single tapered profile extending from one side of the cutting tube and a circular profile on an opposite side of the cutting tube.

34. The device

Assignees

• Zeiss Carl Meditec Inc

Inventors

• Carter Brett
• Chamness Scott
• Clauson Luke W
• Lewis Nicholas G
• Newell Matthew
• Raye Michael
• Rector Thomas M
• Schaller Michael P

Classifications

• A61F9/00736 Primary

  Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments (A61F9/008 takes precedence) · CPC title

• A61F9/00745

  using mechanical vibrations, e.g. ultrasonic · CPC title

• A61B2217/007

  with irrigation system · CPC title

• A61B2017/00402

  Piezo electric actuators · CPC title

• A61F9/00763 Primary

  with rotating or reciprocating cutting elements, e.g. concentric cutting needles (atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016) · CPC title