Collet for an endoscopic needle knife
AssigneeCook Medical Technologies LLC
InventorJohn Crowder Sigmon, JR.
Life of this patent
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Abstract
An endoscopic needle knife may include a collet coupled to a distal end of a tubular member of the needle knife. A cutting wire may be disposed within a cutting wire lumen of the tubular member and a central lumen of the collet. An inner surface of the collet body may create a frictional force between the cutting wire and the inner surface so that the cutting wire is resistant to longitudinal movement relative to the tubular member caused by external forces. The frictional force may also be less than a longitudinal force exerted on the cutting wire by a handle assembly or other control mechanism that is used to longitudinally move the cutting wire within the tubular member and the collet.
Claims21
An endoscopic needle knife configured to perform an electrosurgical procedure at a treatment site within a patient, the endoscopic needle knife comprising:
- a cutting wire configured to conduct an electrical current to perform the electrosurgical procedure;
- an elongate tubular member;
- a cutting wire lumen longitudinally extending through the tubular member and configured to receive the cutting wire;
- and
- a collet coupled to a distal end of the tubular member, the collet comprising:
- a collet body;
- and
- a central lumen longitudinally extending through the collet body and configured to receive the cutting wire,
- wherein the collet body comprises an inner surface defined by the central lumen, and
- wherein the inner surface of the collet body exerts an inward force on the cutting wire when the cutting wire is disposed within the central lumen of the collet.
A collet coupled to a catheter of an endoscopic needle knife, the collet comprising:
- a collet body comprising a proximal portion configured to be coupled to a distal end of a tubular member of the endoscopic needle knife;
- and
- a central lumen longitudinally extending through the collet body, the central lumen sized to have a cutting wire of the endoscopic needle knife movably disposed therein,
- wherein the collet body comprises an inner surface defined by the central lumen, the inner surface creating a frictional force with the cutting wire when the proximal portion is coupled to the distal end of the tubular member, the frictional force preventing longitudinal movement of the cutting wire caused by one or more external forces during operation of the endoscopic needle knife.
A medical system comprising an endoscopic needle knife and a power source electrically coupled to the endoscopic needle knife to deliver electrical current to the endoscopic needle knife for performance of an electrosurgical procedure, the endoscopic needle knife comprising:
- an elongate tubular member;
- a cutting wire lumen longitudinally extending through the tubular member;
- a collet coupled to a distal end of the tubular member, the collet comprising:
- a collet body;
- and
- a central lumen longitudinally extending through the collet body,
- wherein the collet body comprises an inner surface defined by the central lumen;
- a cutting wire that receives the electrical current from the power source to perform the electrosurgical procedure, the cutting wire disposed within the cutting wire lumen and the central lumen of the collet;
- and
- a handle assembly comprising a control mechanism operatively coupled with the cutting wire to longitudinally move the cutting wire relative to the tubular member,
- wherein the inner surface of the collet body exerts an inward force on the cutting wire to create a frictional force between the cutting wire and the inner surface,
- wherein the frictional force is greater than longitudinal external forces exerted on the cutting wire during operation of the endoscopic needle knife, and less than a longitudinal force exerted on the cutting wire by the control mechanism.
A medical device comprising:
- an elongate tubular member;
- an inner member lumen longitudinally extending through the tubular member;
- an elongate inner member longitudinally extending and movably disposed in the inner member lumen;
- a collet coupled to a distal end of the tubular member, the collet comprising:
- a collet body;
- and
- a central lumen longitudinally extending through the collet body and configured to receive the elongate inner member,
- wherein the collet body comprises an inner surface defined by the central lumen, and
- wherein the inner surface of the collet body exerts an inward force on the elongate inner member when the elongate inner member is disposed within the central lumen of the collet.
Dependencies are inferred from the claim text.