Stylet and catheter assembly
AssigneeTerumo Kabushiki Kaisha
InventorMasakazu Miyata
Life of this patent
Estimating the term…
Abstract
A stylet for axially stretching a catheter ensures flexibility in the distal side and a desired degree of stiffness in the proximal side to enable preferable insertion of a catheter assembly along a guidewire while preventing a kink or breakage. The stylet 50 includes a hollow outer layer tube 51 extending in an axial direction and a hollow inner layer tube 52 disposed in the inner periphery of the outer layer tube. The inner layer tube is formed from a material stiffer than that of the outer layer tube. In the inner layer tube, a distal portion has the inner periphery provided with a tapered diameter portion 52B having a diameter reduced toward the proximal side in the axial direction.
Claims12
A stylet configured to be insertable into a catheter including a lumen that allows passage of blood, the stylet comprising:
- a hollow outer layer tube extending in an axial direction between a distal end and a proximal end and having an inner periphery;
- and
- a hollow inner layer tube disposed in the inner periphery of the outer layer tube along an axial portion of the outer layer tube at the proximal end, and formed from a material stiffer than a material of the outer layer tube;
- the inner layer tube including a distal portion having a reduced thickness wherein an inner periphery of the inner layer tube is provided with a tapered diameter portion having an inner diameter which is gradually reduced from a distal tip toward a proximal side of the inner layer tube in the axial direction.
A catheter assembly comprising:
- a catheter including a lumen that allows passage of blood;
- and
- a stylet insertable into the lumen comprising:
- a hollow outer layer tube extending in an axial direction between a distal end and a proximal end and having an inner periphery;
- and
- a hollow inner layer tube disposed in the inner periphery of the outer layer tube along an axial portion of the outer layer tube at the proximal end, and formed from a material stiffer than a material of the outer layer tube;
- the inner layer tube including a distal portion having a reduced thickness wherein an inner periphery of the inner layer tube is provided with a tapered diameter portion having an inner diameter which is gradually reduced from a distal tip toward a proximal side of the inner layer tube in the axial direction.
A catheter assembly comprising:
- a catheter including a lumen that allows passage of blood;
- and
- a stylet insertable into the lumen for stretching the catheter, comprising:
- a hollow outer layer tube extending in an axial direction between a distal end and a proximal end and having an inner periphery, wherein the outer layer tube has a recess that is recessed radially outward within an axial portion of the outer layer tube at the proximal end;
- and
- a hollow inner layer tube disposed in the recess;
- wherein the inner layer tube is formed from a material which is stiffer than a material of which the outer layer tube is formed;
- whereby the stylet has a distal end which is relatively flexible compared to a proximal end of the stylet.
Dependencies are inferred from the claim text.