Medical device

Patent metadata

Field	Value
Publication number	US-2016354108-A1
Application number	US-201615171839-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 2, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A medical device for incising a substance inside a biological lumen. The medical device includes a tubular drive shaft that is rotatable, an intermediate portion connected to the drive shaft, at least one strut interlocked with the drive shaft, a tubular linear motion shaft inside of the drive shaft, and a tubular interlock portion. The strut is rotatable with the drive shaft and is expandable radially outward in response to outward expansion of the intermediate portion. The linear motion shaft is movable relative to the drive shaft in the axial direction to cause the strut to expand radially outward. The tubular interlock portion interlocks the drive shaft and the linear motion shaft while maintaining liquid-tight properties. The tubular interlock portion is stretchable in the axial direction.

First claim

What is claimed is:

1 . A medical device for incising a substance inside a biological lumen, the medical device comprising:
a tubular drive shaft that is rotatable about a rotary axis, the drive shaft possessing a distal portion, a proximal portion, and extending in an axial direction; an intermediate portion connected to the distal portion of the drive shaft, the intermediate portion being expandable radially outward; at least one strut interlocked with a distal portion of the drive shaft, the at least one strut being rotatable with the drive shaft, extending along the rotary axis and being expandable radially outward in response to radial outward expansion of the intermediate portion; a tubular linear motion shaft inside the drive shaft, the linear motion shaft being movable relative to the drive shaft in the axial direction to cause the strut to expand radially outward, the linear motion shaft being rotatable together with the drive shaft, the linear motion shaft possessing a proximal portion; and a tubular interlock portion that interlocks the proximal portion of the drive shaft and the proximal portion of the linear motion shaft while maintaining liquid-tight properties and is stretchable in the axial direction.

2 . The medical device according to claim 1 ,
wherein the drive shaft comprises a gear portion receiving a rotary drive force to rotate the drive shaft, and the interlock portion is proximal to the gear portion of the drive shaft receiving the rotary drive force.

3 . The medical device according to claim 1 , wherein the interlock portion includes a plurality of members.

4 . The medical device according to claim 1 ,
wherein the interlock portion is configured to absorb torsion due to misalignment occurring between the proximal portion of the drive shaft and the proximal portion of the linear motion shaft about the rotary axis.

5 . The medical device according to claim 1 ,
wherein the interlock portion is a tubular body possessing a distal end and a proximal end, and the interlock portion tapers in the axial direction from the distal end to the proximal end of the interlock portion.

6 . The medical device according to claim 1 , further comprising:
an inner tube inside of the linear motion shaft, the inner tube being configured not to restrain rotation of the drive shaft and the linear motion shaft.

7 . A medical device comprising:
a drive shaft configured to rotate about a rotary axis, the drive shaft being tubular and possessing a distal end, a proximal end, and extending in an axial direction; a linear motion shaft inside the drive shaft, the linear motion shaft being movable relative to the drive shaft in the axial direction, the linear motion shaft being rotatable together with the drive shaft, the linear motion shaft being tubular and possessing a distal end; a tubular tip connected to the distal end of the linear motion shaft; a support section possessing a distal end and a proximal end, the proximal end of the support section being connected to the distal end of the drive shaft, the distal end of the support section being connected to the linear motion shaft; at least one strut comprising a blade configured to incise a stenosed site of a living body, the at least one strut having a proximal end connected to the distal portion of the drive shaft and a distal end, the distal end of the at least one strut being a free end, the at least one strut being rotatable with the drive shaft, and the at least one strut extending along the rotary axis; the support section being configured to expand radially outward when the linear motion shaft moves proximally relative to the drive shaft in the axial direction, the support section contacting the at least one strut to expand the at least one strut radially outward; and the tubular tip being configured to contact the free end of the at least one strut to expand the at least one strut radially outward.

8 . The medical device according to claim 7 , further comprising:
a tubular interlock portion possessing a distal end and a proximal end, the distal end of the tubular interlock portion being connected to the proximal end of the drive shaft and the proximal end of the tubular interlock portion being connected to the linear motion shaft; and an annular recess being between the drive shaft and the linear motion shaft, wherein the tubular interlock portion prevents fluid flow in the annular recess proximally of the proximal end of the tubular interlock portion.

9 . The medical device according to claim 8 , wherein
the drive shaft possesses an outer peripheral surface; the linear motion shaft possesses an outer peripheral surface; and the tubular interlock portion is connected to the outer peripheral surface of the drive shaft and the outer peripheral surface of the linear motion shaft.

10 . The medical device according to claim 7 , wherein
the at least one strut comprises a plurality of struts, the struts each possessing a radially inner surface; the support section comprising a plurality of wire members, the wire members each possessing a radially outer surface; and the radially outer surface of the wire members contacts the radially inner surface of the struts when the linear motion shaft moves proximally relative to the drive shaft in the axial direction to expand the support section radially outward.

11 . The medical device according to claim 10 , wherein
the support section possesses a support section maximum outer diameter; the struts possess a strut maximum outer diameter; and the strut maximum outer diameter is greater than the support section maximum outer diameter before the tubular tip contacts the free end of the at least one strut.

12 . The medical device according to claim 11 , wherein the support section maximum outer diameter is greater than the strut maximum outer diameter after the tubular tip contacts the free end of the at least one strut to expand the at least one strut radially outward.

13 . The medical device according to claim 10 , wherein the wire members extend beyond gaps between the plurality of struts when the tubular tip contacts the free end of the at least one strut.

14 . The medical device according to claim 8 , wherein the tubular interlock portion comprises a flexible material and a rigid material, the rigid material being less flexible than the flexible material.

15 . The medical device according to claim 7 , wherein
the at least one strut comprises an open portion and a straight portion, the blade being an inner edge of the open portion, and the at least one strut being wider at the open portion than at the straight portion.

16 . The medical device according to claim 7 , wherein
the at least one strut comprises a first strut and a second strut, the first strut comprising a plurality of blades, the second strut comprising a plurality of blades, and the blades of the first strut being a different number than the blades of the second strut.

17 . A method comprising:
inserting a medical device into a biological lumen of a living body, the medical device comprising a drive shaft that is rotatable, a strut connected to the drive shaft, a linear motion shaft inside the drive shaft, and a tubular interlock portion that interlocks a proximal portion of the drive shaft and a proximal portion of the linear motion shaft in a liquid-tight manner; expanding the strut radially outward by moving the linear motion shaft in an axial direction relative to the drive shaft so that the strut is an expanded state; rotating the drive

Assignees

• Terumo Corp

Inventors

• Nakano Taiga
• Kobayashi Junichi
• Hatta tomonori

Classifications

• A61B2017/00017

  Electrical control of surgical instruments · CPC title

• A61B2017/2212

  having a closed distal end, e.g. a loop · CPC title

• A61B2017/00867

  shape memory effect · CPC title

• A61B17/320725

  with radially expandable cutting or abrading elements (A61B17/32075 takes precedence) · CPC title

• A61B2017/00398

  using powered actuators, e.g. stepper motors, solenoids · CPC title