Catheter including drive assembly for rotating and reciprocating tissue-removing element

Patent metadata

Field	Value
Publication number	US-9962180-B2
Application number	US-201615139459-A
Country	US
Kind code	B2
Filing date	Apr 27, 2016
Priority date	Apr 27, 2016
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A tissue-removing catheter includes a drive assembly operatively connected to a drive shaft to impart rotation and reciprocation to the drive shaft and thereby rotate and reciprocate a tissue-removing element of the catheter. The drive assembly includes a prime mover configured to generate a rotational drive force and a reciprocating rotor operatively connected to the prime mover to receive the rotational drive force. The rotor is also operatively connected to the drive shaft to impart rotation and reciprocation to the drive shaft. The drive assembly can include a stator configured to constrain rotation and reciprocation of the reciprocating rotor relative to an axis of the rotor. The rotor can define a race that extends around the rotor axis, and the stator can define one or more bearing projections that track through the race as the prime mover rotates the rotor about the rotor axis to drive reciprocation of the rotor.

First claim

What is claimed is:

1. A tissue-removing catheter configured for insertion into a body lumen of a subject, the catheter comprising:
a drive shaft having opposite proximal and distal end portions, and a longitudinal axis extending between the proximal and distal end portions thereof;
a tissue-removing element operatively connected to the distal end portion of the drive shaft such that rotation of the drive shaft imparts rotation of the tissue-removing element; and
a drive assembly operatively connected to the proximal end portion of the drive shaft, the drive assembly comprising:
a prime mover configured to generate a rotational drive force; and
a reciprocating rotor operatively connected to the prime mover to receive the rotational drive force, the reciprocating rotor configured to simultaneously rotate about a rotor axis and reciprocate along the rotor axis in response to the rotational drive force, the reciprocating rotor being operatively connected to the proximal end portion of the drive shaft to impart rotation to the drive shaft about the longitudinal axis and reciprocation of the drive shaft along the longitudinal axis as the rotor rotates and reciprocates relative to the rotor axis;

wherein the drive assembly further comprises a stator comprising a bearing projection configured to constrain rotation and reciprocation of the reciprocating rotor relative to the rotor axis.

2. A tissue-removing catheter as set forth in claim 1 , wherein the rotor defines a race extending around the rotor axis, wherein the bearing projection is received in the race.

3. A tissue-removing catheter as set forth in claim 2 , wherein the bearing projection is slidable along the race to allow rotation of the reciprocating rotor relative to the stator.

4. A tissue-removing catheter as set forth in claim 3 , wherein the race is configured to allow tracking of the bearing projection therein to impart reciprocation of the rotor along the rotor axis as the rotor rotates relative to the stator.

5. A tissue-removing catheter as set forth in claim 2 , wherein the race defines an axially sinuous path as the race extends only one revolution around the rotor axis.

6. A tissue-removing catheter as set forth in claim 5 , wherein the race includes first and second distal apexes, the first and second distal apexes being diametrically spaced apart from one another about the rotor axis.

7. A tissue-removing catheter as set forth in claim 6 , wherein the bearing projection comprises a first and second bearing projection, the first and second bearing projections being diametrically spaced apart from one another about the rotor axis.

8. A tissue-removing catheter as set forth in claim 6 , wherein the race further includes third and fourth distal apexes, the third and fourth distal apexes being diametrically spaced apart from one another about the drive axis, the third and fourth distal apexes being circumferentially spaced apart from the first and second distal apexes about the rotor axis.

9. A tissue-removing catheter as set forth in claim 5 wherein the race includes at least three distal apexes that are equally circumferentially spaced about the rotor axis and the stator includes at least three bearing projections that are equally circumferentially spaced about the rotor axis.

10. A tissue-removing catheter as set forth in claim 1 , wherein the stator comprises a stator housing in which the rotor is received.

11. A tissue-removing catheter as set forth in claim 10 , wherein the bearing projection extends radially inward from a wall of the stator housing.

12. A tissue-removing catheter as set forth in claim 11 , wherein the bearing projection comprises a bearing pin secured to the stator housing.

13. A tissue-removing catheter as set forth in claim 10 , wherein the stator housing defines a distal end wall and an opening extending axially through the distal end wall in communication with the cavity, a portion of the rotor extending into the opening.

14. A tissue-removing catheter as set forth in claim 10 , wherein the stator housing and the rotor are shaped and arranged to allow reciprocation of the rotor in the housing.

15. A tissue-removing catheter as set forth in claim 1 , wherein the prime mover comprises an output shaft operatively connected to the rotor to transmit the rotational drive force to the rotor.

16. A tissue-removing catheter as set forth in claim 15 , wherein the prime mover comprises an electric motor.

17. A tissue-removing catheter as set forth in claim 15 , wherein the rotor is driven directly by the drive shaft.

18. A tissue-removing catheter as set forth in claim 17 , wherein the rotor and output shaft are configured to permit reciprocation of the rotor along the rotor axis with respect to the output shaft.

19. A tissue-removing catheter as set forth in claim 15 , wherein the output shaft of the prime mover is offset from the rotor axis, the drive assembly further comprising a transmission mechanism for conveying the rotational drive force from the output shaft to the rotor.

20. A tissue-removing catheter as set forth in claim 1 , wherein the catheter is cannulated to define a guidewire passage configured to receive a guidewire.

21. A tissue-removing catheter configured for insertion into a body lumen of a subject, the catheter comprising:
a drive shaft having opposite proximal and distal end portions, and a longitudinal axis extending between the proximal and distal end portions thereof;
a tissue-removing element operatively connected to the distal end portion of the drive shaft such that rotation of the drive shaft imparts rotation of the tissue-removing element; and
a drive assembly operatively connected to the proximal end portion of the drive shaft, the drive assembly comprising:
a prime mover configured to generate a rotational drive force; and
a reciprocating rotor operatively connected to the prime mover to receive the rotational drive force, the reciprocating rotor configured to simultaneously rotate about a rotor axis and reciprocate along the rotor axis in response to the rotational drive force, the reciprocating rotor being operatively connected to the proximal end portion of the drive shaft to impart rotation to the drive shaft about the longitudinal axis and reciprocation of the drive shaft along the longitudinal axis as the rotor rotates and reciprocates relative to the rotor axis;

wherein the prime mover comprises an output shaft operatively connected to the rotor to transmit the rotational drive force to the rotor; and
wherein the output shaft of the prime mover is offset from the rotor axis, the drive assembly further comprising a transmission mechanism for conveying the rotational drive force from the output shaft to the rotor.

22. A tissue-removing catheter as set forth in claim 21 , wherein the rotor defines a race extending a single revolution around the rotor axis and the drive assembly further comprises a stator including a portion that operatively engages the race to constrain rotation and reciprocation of the reciprocating rotor relative to the rotor axis.

23. A tissue-removing catheter as set forth in claim 22 , wherein the race defines an axially sinuous path as the race extends only one revolution around the rotor axis.

24. A tissue-removing catheter as set forth in claim 23 , wherein the race includes first and second distal apexes that are diametrically spaced apart from one another about the rotor axis and said port

Assignees

• Covidien Lp

Inventors

• Steele Bradley

Classifications

• A61B17/320758 Primary

  with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002) · CPC title

• A61B17/320783

  through side-hole, e.g. sliding or rotating cutter inside catheter · CPC title

• A61B2017/320028

  with reciprocating movements · CPC title

• A61B17/32002 Primary

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B2017/320791

  with cutter extending outside the cutting window · CPC title