Grasping tool
AssigneeColoplast A/S
InventorsKaspar Matthison-Hansen, Thomas Bachgaard Jensen, Jakob Boennelykke Kristensen
Life of this patent
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Abstract
A grasping tool (20) for removing a stent from the body of a patient. The grasping tool has a grasping head (38) forming two jaws connected to each other and configured to be shifted between an open state and a closed state. Each jaw includes three portions having different thicknesses. The grasping tool is configured to obtain sufficient holding force between the jaws while requiring reduced operating force of the tool. A method for removing a stent from a patient is also disclosed.
Claims22
A grasping tool for removing a stent from a patient, the grasping tool comprising:
- a handle housing forming a proximal portion of the grasping tool;
- a sheath having a first proximal end and a first distal end, with the sheath having an internal surface and an external surface, with the external surface sized for insertion into a urethra and defining an outermost surface of a distal end portion of the grasping tool;
- a motion transfer member movable within the sheath and having a second proximal end and a second distal end, the second proximal end connected to a tool operating member provided on the handle housing and the second distal end connected to a grasping head;
- wherein the grasping head comprises a first jaw and a second jaw, where the first jaw and the second jaw are configured to be shifted between a closed state and an open state by actuating the tool operating member;
- wherein each of the first jaw and the second jaw comprises a connecting portion having a first thickness, an intermediate portion having a second thickness and a gripping portion having a third thickness, where the gripping portion of the first jaw and the gripping portion of the second jaw each terminate at a tooth prong adapted to grasp a ureteral stent,
- wherein an internal surface of each intermediate portion, evaluated to extend an entire length from the tooth prong along the internal surface to the connecting portion, is planar on each of the first jaw and the second jaw,
- wherein an external surface of each intermediate portion has a tapered portion tapering from a thinner region of the second thickness of each intermediate portion to a thicker region of the third thickness of each gripping portion, with the first jaw and the second jaw connected to each other at the connecting portion;
- a connecting tube connected between the grasping head and the motion transfer member, where the connecting tube is movable within the sheath;
- and
- wherein a stop is located inside of the sheath to limit axial movement of the connecting tube in a proximal direction and to control retraction of the grasping head into the sheath.
A ureteral stent grasper having a sheath that insertable into a urethra, the ureteral stent grasper comprising:
- a grasping head comprising movable jaws including a first jaw connected to a second jaw, with the grasping head movable into the sheath in a distal direction to close the movable jaws and the grasping head movable out of the sheath in a proximal direction to open the movable jaws;
- wherein each of the first jaw and the second jaw comprises a connecting portion having a first thickness, an intermediate portion having a second thickness and a gripping portion having a third thickness, where the gripping portion of the first jaw and the gripping portion of the second jaw each terminate at a tooth prong;
- wherein an internal surface of each intermediate portion, evaluated to extend an entire length from the tooth prong along the internal surface to the connecting portion, is planar on each of the first jaw and the second jaw;
- wherein an external surface of each intermediate portion has a tapered zone tapering from a thinner region of the second thickness of each intermediate portion to a thicker region of the third thickness of each gripping portion;
- wherein the tapered zone is adapted to provide a ramp for sliding engagement with the sheath to reduce a retraction force for the grasping head when moving into the sheath.
Dependencies are inferred from the claim text.