Medical device and treatment method
AssigneeTerumo Kabushiki Kaisha
InventorsKosuke Nishio, Tomonori Hatta
Life of this patent
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Abstract
A medical device and a treatment method are disclosed, which can improve safety by reducing damage to a biological tissue while an object inside a biological lumen can be cut. A medical device is disclosed for cutting an object inside a biological lumen includes a rotatable drive shaft, and a rotary structure that interlocks with a distal side of the drive shaft so as to be rotated by the drive shaft. The rotary structure has a cutting portion for cutting the object, and a non-cutting portion capable of smoothly coming into contact with a biological tissue. The non-cutting portion is located in a maximum outer diameter portion of the rotary structure.
Claims17
A medical device for cutting an object inside a biological lumen, the medical device comprising:
- a rotatable drive shaft;
- a rotary structure configured to interlock with a distal side of the drive shaft so as to be rotated by the drive shaft;
- the rotary structure having a cutting portion configured to cut the object, and a non-cutting portion capable of coming into contact with a biological tissue, and wherein the non-cutting portion is located in a maximum outer diameter portion of the rotary structure;
- the non-cutting portion including a first non-cutting portion and a second non-cutting portion, the first non-cutting portion being proximal to the second non-cutting portion and wherein an outer diameter of the first non-cutting portion is larger in a radial direction than an outer diameter of the second non-cutting portion and an outer diameter of a proximal portion of the cutting portion is larger in the radial direction than an outer diameter of a distal portion of the cutting portion;
- wherein the cutting portion of the rotary structure includes a tapered cutting portion disposed on a distal side of the first non-cutting portion, the tapered cutting portion tapering towards the second non-cutting portion of the rotary structure, the tapered cutting portion being interposed between the first non-cutting portion and the second non-cutting portion along an axial direction, and the tapered cutting portion is located inside a tangential line between the first non-cutting portion and the second non-cutting portion in a cross section along the axial direction;
- and
- a distal tapered portion disposed on a distal side of the second non-cutting portion, the distal tapered portion tapering in a conical shape towards a distal end of the rotary structure.
A treatment method for cutting an object inside a biological lumen with a medical device, the medical device including a rotatable drive shaft, a rotary structure that interlocks with a distal side of the drive shaft so as to be rotated by the drive shaft, and the rotary structure having a cutting portion for cutting the object, and a non-cutting portion capable of coming into contact with a biological tissue, and wherein the non-cutting portion is located in a maximum outer diameter portion of the rotary structure, the non-cutting portion having a first non-cutting portion and a second non-cutting portion, the first non-cutting portion being proximal to the second non-cutting portion and wherein an outer diameter of the first non-cutting portion is larger in a radial direction than an outer diameter of the second non-cutting portion and an outer diameter of a proximal portion of the cutting portion is larger in the radial direction than an outer diameter of a distal portion of the cutting portion, wherein the cutting portion of the rotary structure includes a tapered cutting portion disposed on a distal side of the first non-cutting portion, the tapered cutting portion tapering towards the second non-cutting portion of the rotary structure, and a distal tapered portion disposed on a distal side of the second non-cutting portion, the distal tapered portion tapering in a conical shape towards a distal end of the rotary structure, the tapered cutting portion being interposed between the first non-cutting portion and the second non-cutting portion along an axial direction, and the tapered cutting portion is located inside a tangential line between the first non-cutting portion and the second non-cutting portion in a cross section along the axial direction, the method comprising:
- inserting the rotary structure into the biological lumen;
- and
- causing the tapered cutting portion to cut the object inside the biological lumen while the rotary structure is rotated and the first non-cutting portion and the second non-cutting portion are brought into contact with the biological tissue.
A medical device for cutting an object inside a biological lumen, the medical device comprising:
- a rotatable drive shaft;
- a rotary structure configured to interlock with a distal side of the drive shaft so as to be rotated by the drive shaft;
- the rotary structure having a cutting portion configured to cut the object, and a non-cutting portion capable of coming into contact with a biological tissue, and wherein the non-cutting portion is located in a maximum outer diameter portion of the rotary structure;
- the non-cutting portion includes a first non-cutting portion and a second non-cutting portion, the first non-cutting portion being proximal to the second non-cutting portion and wherein an outer diameter of the first non-cutting portion is larger in a radial direction than an outer diameter of the second non-cutting portion and an outer diameter of a proximal portion of the cutting portion is larger in the radial direction than an outer diameter of a distal portion of the cutting portion;
- the cutting portion of the rotary structure includes a tapered cutting portion disposed on a distal side of the first non-cutting portion, the tapered cutting portion tapering towards the second non-cutting portion of the rotary structure, the tapered cutting portion being interposed between the first non-cutting portion and the second non-cutting portion along an axial direction, and the tapered cutting portion is located inside a tangential line between the first non-cutting portion and the second non-cutting portion in a cross section along the axial direction;
- and
- a distal tapered portion disposed on a distal side of the second non-cutting portion, the distal tapered portion tapering in a conical shape towards a distal end of the rotary structure, and a proximal tapered portion on a proximal side of the first non-cutting portion, the proximal tapered portion tapering towards a proximal side of the rotary structure.
Dependencies are inferred from the claim text.