Biostimulator transport system having swaged torque shaft

Patent metadata

Field	Value
Publication number	US-2021138252-A1
Application number	US-202016859706-A
Country	US
Kind code	A1
Filing date	Apr 27, 2020
Priority date	Nov 8, 2019
Publication date	May 13, 2021
Grant date	—

Abstract

A biostimulator transport system, such as a biostimulator delivery system, having a swaged torque shaft, is described. The torque shaft includes an outer cable coaxially arranged with an inner coil. The inner coil has a single wire coil extending around a central axis in a first helical direction, and the outer cable has several outer strands that extend around the central axis in a second helical direction that is different than the first helical direction. The outer cable can be swaged to form a close fit to the inner coil. The close fit of the swaged coaxial torque shaft structure can track to a target site through tortuous vessels and efficiently transfer torque from a handle to a docking cap of the biostimulator transport system to drive a biostimulator into the target site. Other embodiments are also described and claimed.

First claim

What is claimed is:

1 . A torque shaft assembly, comprising:
an inner coil including a wire coil extending about a central axis in a first helical direction over a coil length between a proximal coil end and a distal coil end; and an outer cable including a plurality of outer strands extending helically around the inner coil in a second helical direction from the proximal coil end to the distal coil end, wherein the outer cable is swaged.

2 . The torque shaft assembly of claim 1 , wherein the plurality of outer strands form one or more of a friction fit or a slip fit with the wire coil.

3 . The torque shaft assembly of claim 1 , wherein the outer cable is swaged over an entirety of the coil length.

4 . The torque shaft assembly of claim 1 , wherein the outer cable is swaged over only a portion of the coil length.

5 . The torque shaft assembly of claim 1 , wherein the plurality of outer strands have a pre-swaged cross-sectional profile that is different than a post-swaged cross-sectional profile.

6 . The torque shaft assembly of claim 1 , wherein one or more of the wire coil or the plurality of outer strands have a rectangular cross-sectional profile.

7 . The torque shaft assembly of claim 1 , wherein the first helical direction is opposite to the second helical direction.

8 . The torque shaft assembly of claim 1 , wherein the plurality of outer strands are in contact with each other such that the outer cable is tubular.

9 . The torque shaft assembly of claim 1 , wherein the wire coil has a plurality of turns in contact with each other such that the inner coil is a stacked coil tube.

10 . The torque shaft assembly of claim 1 , wherein a weld joins the inner coil to the outer cable at the proximal coil end or the distal coil end.

11 . A biostimulator transport system, comprising:
a handle; a docking cap having a docking cavity to receive an attachment feature of a biostimulator; and a torque shaft having a proximal shaft end coupled to the handle and a distal shaft end coupled to the docking cap, wherein the torque shaft includes an inner coil including a wire coil extending about a central axis in a first helical direction, and an outer cable including a plurality of outer strands extending helically around the inner coil in a second helical direction, and wherein the outer cable is swaged.

12 . The biostimulator transport system of claim 11 further comprising a hypotube connecting the proximal shaft end to the handle.

13 . The biostimulator transport system of claim 12 , wherein the handle includes a proximal handle portion that is rotationally moveable relative to a distal handle portion, and wherein the proximal handle portion is coupled to the hypotube.

14 . The biostimulator transport system of claim 13 , wherein the outer cable is swaged over an entirety of a coil length of the inner coil such that the plurality of outer strands form one or more of a friction fit or a slip fit with the wire coil.

15 . The biostimulator transport system of claim 13 , wherein the first helical direction is opposite to the second helical direction.

16 . The biostimulator transport system of claim 13 , wherein the plurality of outer strands are in contact with each other such that the outer cable is tubular.

17 . The biostimulator transport system of claim 13 , wherein the wire coil has a plurality of turns in contact with each other such that the inner coil is a stacked coil tube.

18 . A method of manufacturing a torque shaft assembly, comprising:
loading an outer cable over an inner coil to form a torque shaft having a proximal shaft end and a distal shaft end, wherein the inner coil includes a wire coil extending about a central axis in a first helical direction, and wherein the outer cable includes a plurality of outer strands extending helically around the inner coil in a second helical direction; and swaging the outer cable.

19 . The method of claim 18 further comprising attaching the proximal shaft end to a hypotube.

20 . The method of claim 19 further comprising mounting a docking cap on the distal shaft end, wherein the docking cap has a docking cavity to receive an attachment feature of a biostimulator.

21 . A torque shaft assembly, comprising:
an inner coil including a wire coil extending about a central axis in a first helical direction over a coil length between a proximal coil end and a distal coil end; an outer cable including a plurality of outer strands extending helically around the inner coil in a second helical direction from the proximal coil end to the distal coil end; and an outer sleeve containing the inner coil and the outer cable.

22 . The torque shaft assembly of claim 21 , wherein the outer sleeve is a tubular component having an inner diameter equal to an outer diameter of the outer cable.

23 . The torque shaft assembly of claim 22 , wherein the outer sleeve is attached to the outer cable at a proximal sleeve end and a distal sleeve end.

24 . The torque shaft assembly of claim 21 , wherein the outer cable is swaged.

25 . The torque shaft assembly of claim 24 , wherein the plurality of outer strands have a pre-swaged cross-sectional profile that is different than a post-swaged cross-sectional profile.

26 . The torque shaft assembly of claim 21 , wherein one or more of the wire coil or the plurality of outer strands have a rectangular cross-sectional profile.

27 . The torque shaft assembly of claim 21 , wherein the first helical direction is opposite to the second helical direction.

Assignees

• Pacesetter Inc

Inventors

• Eby Thomas B
• Callol Joe
• Kabe Arundhati
• Coyle Daniel

Classifications

• A61N1/3756 Primary

  Casings with electrodes thereon, e.g. leadless stimulators · CPC title

• A61N2001/0578

  having means for removal or extraction · CPC title

• A61N1/362

  Heart stimulators (heart defibrillators A61N1/39) · CPC title

• A61N1/37518

  Anchoring of the implants, e.g. fixation · CPC title

• F16C2316/10

  in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances · CPC title