Medical tubing and extrusion die for producing the same
AssigneeTerumo Kabushiki Kaisha
InventorsTakashi Kaneko, Hideki Tsukamoto, Shinichiro Matsuura, Shuji Akaiwa
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Abstract
A thin-walled medical tubing comprising an elongated hollow tubular body which is open at both ends and extends continuously therebetween has a filler-containing resin layer in which the filler is oriented in a substantially circumferential direction with respect to the hollow tubular body. The tubing has excellent maneuverability, including pushability, ability to transmit torque, trackability and kink resistance, enabling it to be used as a sheath or catheter.
Claims9
A medical tubing comprising an elongated hollow tubular body which is open at both ends and extends continuously therebetween, wherein the hollow tubular body has a filler-containing resin layer in which the filler is oriented in a substantially circumferential direction with respect to the hollow tubular body.
An introducer sheath comprising:
- a sheath portion which is an elongated hollow tubular body having a distal end and a proximal end and which has a lumen, and
- a hub which is a housing having a central cavity and which is disposed at the proximal end of the sheath portion so that the central cavity communicates with the sheath lumen;
- wherein the sheath portion has a filler-containing resin layer, which filler is oriented within the resin layer in a substantially circumferential direction with respect to the hollow tubular body.
An extrusion die for producing medical tubing, which die comprises:
- a die body having at least two resin inlets, a flow-combining section located at an extrusion downstream end of the die body and, at the interior thereof, branched channels that communicate independently between each resin inlet and the flow-combining section and meet at the flow-combining section;
- a mandrel which is a cylindrical body situated at the interior of and passing through the die body, has a downstream end in the extrusion direction that extends beyond the flow-combining section, and has a cylindrical outer peripheral surface that contacts the resin passing through the die;
- and
- a female die member which is disposed coaxially with the mandrel at the downstream end of the die body in the extrusion direction and has an inner peripheral surface;
- wherein the outer peripheral surface of the mandrel adjoins the inner peripheral surface of the female die member across an intervening gap of annular cross-section, wherein the gap communicates with the flow-combining section and forms a resin flow channel within the female die member, and wherein the mandrel or the female die member or both are axially rotatable relative to the direction of extrusion.
Dependencies are inferred from the claim text.