Rotational atherectomy device with exchangeable drive shaft and meshing gears

Patent metadata

Field	Value
Publication number	US-9439674-B2
Application number	US-201414340353-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Jul 25, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

An atherectomy device with an exchangeable drive shaft is disclosed, having a drive shaft gear at a distal end of the exchangeable drive shaft for meshing engagement with a prime mover gear on the output shaft of the prime mover. The exchangeable drive shaft is inserted into an opening at the distal end of the handle housing and moved axially in a proximal direction. Surface features on at least the prime mover housing and the engageable drive shaft help to align the drive shaft gear with the prime mover gear for meshing engagement.

First claim

What is claimed is:

1. A device, comprising:
a handle, comprising:
a proximal section;
a distal section comprising a channel extending proximally from an opening in a distal end of the handle; and
an elongated hollow intermediate section between the proximal and the distal sections, the intermediate section comprising:
an opening between an interior thereof and the channel in the distal section; and
a slot;

a prime mover carriage comprising a prime mover, the prime mover carriage disposed within the interior of the intermediate section;
a prime mover gear fixedly attached to a shaft of the prime mover;
a control knob having at least a portion thereof extending through the slot and operationally coupled to the prime mover carriage such that a longitudinal displacement of the control knob induces a longitudinal displacement of the prime mover carriage, the control knob comprising:
an unlocked state for permitting the longitudinal displacement of the control knob; and
a locked state for inhibiting the longitudinal displacement of the control knob;

an exchangeable drive shaft cartridge, comprising:
a proximal section and a distal section;
a drive shaft comprising a proximal end and a distal end, the drive shaft extending through an opening in the distal section of the drive shaft cartridge; and
a gear engagement assembly comprising a drive shaft gear fixedly attached to the proximal end of the drive shaft;

one or more connectors for removably connecting the distal section of the handle and the distal section of the drive shaft cartridge to one another, wherein each of the one or more connectors comprises complementary first and second sections, wherein
the first section is integrally formed with the distal section of handle; and
the second section is integrally formed with the distal section of the drive shaft cartridge;

at least one alignment element configured for aligning at least the prime mover gear and the drive shaft gear with one another when the gear engagement assembly is extended into the interior of the intermediate section and positioned proximate the prime mover; and
at least one biasing element configured for removably meshing the prime mover gear and the drive shaft gear when the prime mover gear and the drive shaft gear are aligned with one another such that a rotational movement of one of the prime mover and the drive shaft induces a rotational movement in the other.

2. The device of claim 1 , wherein the one or more connectors are selected from the group consisting of snap-fit connectors, tongue and groove connectors, rails, rotatable connectors, bayonet mounts and ribs.

3. The device of claim 1 , wherein the opening in the distal end of the handle is configured for passage therethrough of the gear engagement assembly and the drive shaft extending distally from the drive shaft gear.

4. The device of claim 1 , wherein the at least one biasing element is selected from the group consisting of a leaf spring, a coil spring and a ramp.

5. The device of claim 1 , wherein the at least one biasing element displaces at least the prime mover gear towards the drive shaft gear.

6. The device of claim 1 , wherein the at least one biasing element displaces at least the drive shaft gear towards the prime mover gear.

7. The device of claim 1 , wherein the proximal section of the handle comprises one of a guide wire clamp and a guide wire brake mechanism.

8. The device of claim 1 , wherein the interior of the intermediate section of the handle is configured for:
longitudinal displacement of the prime mover carriage disposed therewithin;
longitudinal displacement of the gear engagement assembly; and
longitudinal displacement of the drive shaft.

9. The device of claim 1 , wherein the longitudinal displacement of the prime mover carriage induces a longitudinal displacement of the gear engagement assembly and of the drive shaft extending from the gear engagement assembly when the distal section of the handle and the distal section of the drive shaft cartridge are removably connected.

10. The device of claim 1 , wherein at least a portion of the drive shaft is telescoping.

11. The device of claim 10 , comprising a locking mechanism for inhibiting the drive shaft from telescoping when the handle and the drive shaft cartridge are disconnected from one another.

12. The device of claim 10 , wherein the drive shaft cartridge comprises:
a nosecone in the distal section thereof; and
an output gear hypotube;
wherein, at least a portion of the nosecone and at least a portion of the hypotube are configured for being removably coupled with one another.

13. The device of claim 12 , comprising one or more locking mechanism configured for inhibiting the drive shaft from telescoping while the handle and the drive shaft cartridge are not connected with one another.

14. The device of claim 13 , wherein the one or more locking mechanisms are disabled while the handle and the drive shaft cartridge are connected with one another.

15. The device of claim 1 , wherein the prime mover is selected from the group consisting of a turbine and an electric motor.

16. The device of claim 1 , comprising one or more sensors for monitoring a rotational speed of at least one of the prime mover shaft and the drive shaft.

17. The device of claim 1 , wherein the at least one alignment element is selected from the group consisting of ramps, ribs, rails, channels, and tongue-and-groove.

18. The device of claim 1 , comprising:
a lumen having the drive shaft disposed therewithin;
a fluid infusion port in fluid communication with the lumen; and
a fluid reservoir in fluid communication with the fluid infusion port;
wherein, the fluid infusion port is configured for delivering fluid from the fluid reservoir to the lumen.

19. The device of claim 1 , wherein the distal end of the drive shaft is configured for insertion into a vasculature.

20. The device of claim 19 , comprising an abrasive element proximate the distal end of the drive shaft.

21. The device of claim 1 , wherein
the prime mover carriage is positioned distally within the intermediate section of the handle;
the gear engagement assembly is inserted through the opening in the distal end of the handle and advanced towards the prime mover carriage until the prime mover gear and the drive shaft gear are removably meshed; and
the distal section of the handle and the distal section of the drive shaft cartridge are removably connected.

22. The device of claim 21 , comprising at least one disconnect mechanism for disconnecting the removably connected distal sections of the handle and the drive shaft cartridge.

23. The device of claim 22 , wherein
the gear engagement assembly is extracted from the handle by un-meshing the prime mover gear and the drive shaft gear and pulling the gear engagement assembly out through the opening in the distal end of the handle; and
a different drive shaft cartridge is removably connected with the handle.

24. The device of claim 1 , wherein the distal section of the drive shaft cartridge comprises a nosecone having the opening through which the drive shaft extends.

25. The device of claim 1 , wherein at least one of the gear engagement assembly, the prime mover carriage and the interior of the intermediate section of the handle includes the at least one alignment element.

Assignees

• Cardivascular Systems

Inventors

• Rydberg Nicholas W
• Narveson Christopher M
• Smith Gregory H

Classifications

• A61B2017/00473

  Distal part, e.g. tip or head (A61B2017/00464 takes precedence) · CPC title

• A61B90/98

  using electromagnetic means, e.g. transponders · CPC title

• A61B2017/0046

  with a releasable handle; with handle and operating part separable · CPC title

• A61B2017/00477

  Coupling (A61B2017/0046 takes precedence) · CPC title

• Y10T29/4984

  Retaining clearance for motion between assembled parts · CPC title