Surgical instrument for removing an implanted object
Inventors
Grace, Kenneth P. • HOO, Bruce A.
Assignees
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Publication Number
US-11925334-B2
Publication Date
2024-03-12
Expiration Date
Abstract
Methods and devices for separating an implanted object, such as a pacemaker lead, from tissue surrounding such object in a patient's vasculature system. Specifically, the tissue separating device includes a handle, an elongate sheath and a circular cutting blade that may extend from the distal end of the sheath upon actuating the handle. The elongate sheath, particularly its distal end, includes a non-uniform wall thickness having one or more thicker portions in the outer sheath, particularly the outer cam member, and/or one or more thicker portions in an inner member disposed radially inward of the blade.
Core Innovation
The invention relates to a device for removing an implanted object from a body vessel. The device includes a handle and a trigger movably coupled to the handle, and an elongated sheath extending from the handle with a lumen configured to receive the implanted object. The elongated sheath has a proximal portion and a distal portion, with a tubular outer member attached to the distal portion.
A tubular outer member has at least one portion with a non-uniform circumferential wall thickness that is thicker at a distal end of the tubular outer member than at a proximal end. A tubular inner member is located within the tubular outer member, with the tubular inner member having a distal end that comprises a cutting surface. The device coordinates cutting and advancement such that the distal end of the tubular inner member can extend distally beyond the tubular outer member.
An actuator is disposed within the handle and includes a linear slide coupled to the trigger. Upon movement of the trigger relative to the handle, the tubular inner member rotates and the distal end moves axially and extends distally beyond the tubular outer member. The non-uniform wall thickness of the tubular outer member supports orienting the distal thicker portion relative to the inserted implanted object to manage proximity between the implanted object and the cutting surface during operation.
Claims Coverage
The independent claim provides two main inventive features: a handle and trigger-actuated mechanism that rotates an inner tubular cutting member and axially extends its distal cutting end beyond an outer tubular member, and a tubular outer member with a non-uniform circumferential wall thickness that is thicker at its distal end. Dependent claim themes include segmented and circumferentially positioned thickness relationships, structural refinements to the actuator and linear slide, and coordination features involving a pin and a cam slot.
Handle and trigger coupled actuator for inner tubular rotation and distal extension
A device for removing an implanted object from a body vessel comprises a handle, a trigger movably coupled to the handle, an elongated sheath with a lumen configured to receive the implanted object, a tubular outer member attached to a distal portion of the elongated sheath, a tubular inner member located within the tubular outer member with a distal end comprising a cutting surface, and an actuator disposed within the handle comprising a linear slide coupled to the trigger, such that upon movement of the trigger relative to the handle, the tubular inner member rotates and the distal end of the tubular inner member moves axially and extends distally beyond the tubular outer member.
Outer tubular member with non-uniform circumferential wall thickness thicker distally
The device further comprises a tubular outer member attached to the distal portion of the elongated sheath, wherein at least one portion of the tubular outer member has a non-uniform circumferential wall thickness that is thicker at a distal end of the tubular outer member than at a proximal end of the tubular outer member.
Segmented non-uniform wall thickness relationship
The non-uniform circumferential wall thickness comprises a first segment and a second segment, wherein the first segment has a thickness greater than the second segment.
Circumferential positioning of thicker and thinner segments
The first segment is disposed opposite the second segment along a cross section of a circumference of the tubular outer member.
Linear slide structure with rolling ring bearing and unthreaded shaft
The device includes a linear slide that comprises a rolling ring bearing and an unthreaded shaft, wherein the unthreaded shaft is coupled to the tubular inner member.
Pin and cam slot for coordinated actuation
The exterior surface of the tubular inner member comprises a cam slot for receipt of and cooperation with the pin upon actuation of the trigger.
Across the independent claim coverage and its dependent refinements, the main inventive features are the handle and trigger actuated linear-slide mechanism that rotates and axially advances a tubular inner member with a distal cutting surface, together with non-uniform circumferential wall thickness in the tubular outer member that is thicker distally. Additional refinement themes specify segmented and circumferentially opposed thickness relationships, structural details of the linear slide, and coordination of actuation using a pin and a cam slot on the tubular inner member.
Stated Advantages
Documented Applications
No documented applications found
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