Torque Transmission Mechanism With Rated Slip for Pacemaker Implantation
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Solution Overview
Problem
Conventional leadless pacemaker implantation processes are prone to failure due to extended surgical time, risk of damage to cardiac tissue, and unsatisfactory torque-limiting structure detachment, leading to potential retraction and unscrewing issues during implantation.
Innovation Solution
A torque transmission mechanism comprising a torque transmission member, torque receiver, and limiting member, which limits torque transfer to prevent excessive rotation and ensures reliable anchoring of the pacemaker, eliminating the need for on-site assembly and reducing tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a torque-limiting structure is added to the leadless pacemaker or delivery device, then cardiac tissue perforation is prevented, but the device complexity increases and surgical time is extended
Solution Approach 1:
The torque transmission member is nested within the torque receiver, with the limiting member positioned between them. This nested configuration allows the torque-limiting structure to be integrated within the existing delivery device components rather than adding external structures, thereby preventing cardiac tissue perforation while minimizing increases in device complexity
Solution Approach 2:
The limiting member is pre-configured with engagement features (teeth, grooves, or friction surfaces) that automatically engage with the torque transmission member when torque is applied. This preliminary configuration ensures that torque limiting action occurs automatically at the designed rated value without requiring additional control mechanisms, thus preventing tissue perforation while avoiding excessive device complexity
2Ease of operation
If the torque transmission member and torque receiver are separated after implantation, then the torque-limiting structure can be retracted, but the leadless pacemaker may be pulled off or unscrewed causing tissue damage
Solution Approach 1:
The limiting member is designed with engagement features (teeth, grooves, or friction surfaces) that create a mechanical interlock with the torque transmission member. This preliminary anti-action prevents the torque transmission member from rotating independently relative to the torque receiver, thereby preventing the leadless pacemaker from being pulled off or unscrewed when the torque-limiting structure is retracted, while still allowing controlled separation after successful implantation
3Object-affected harmful factors
If the torque transmission member rotates around the torque receiver when torque exceeds rated value, then torque is limited to safe levels, but unsynchronized rotation may cause detachment and surgical failure
Solution Approach 1:
The engagement features between the limiting member and torque transmission member provide mechanical feedback that automatically regulates torque transmission. When torque reaches the rated value, the engagement features allow controlled relative rotation, preventing excessive torque transmission to the leadless pacemaker and ensuring reliable implantation by maintaining synchronized rotation within safe limits
Data Source
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AI summary
The present invention provides a torque transmission mechanism, a method of assembly thereof and a delivery device for an implantable medical device. The torque transmission mechanism includes a torque transmission member, a torque receiver and a limiting member. The torque transmission member is sleeved over an outer circumference of the torque receiver along an axis thereof and configured to receive a torque from an inner sheath and transfer it to the torque receiver. If a torque on the torque transmission member does not exceed a rated value, a torque on the torque receiver is equal to the torque on the torque transmission member, and the torque transmission member drives the torque receiver to rotate in synchronization therewith. If the torque on the torque transmission member exceeds the rated value, the torque transmission member rotates around the torque receiver so that the torque on the torque receiver does not exceed the rated value. The limiting member is configured to limit a position of the torque transmission member relative to the torque receiver on the axis of the torque receiver. With this arrangement, it can be ensured that the torque transmission member can only transfer a torque not exceeding the rated value to the torque receiver.