Hemostasis Clip Assembly With Cam-Driven Rotating Jaws
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Solution Overview
Problem
Existing endoscopic hemostatic clips face challenges in providing effective tissue grasping, secure locking, and efficient deployment mechanisms, which can lead to increased trauma, re-bleeding, and prolonged recovery times in surgical procedures.
Innovation Solution
A novel hemostatic clip assembly with a proximal delivery catheter and distal clip assembly featuring a jaw assembly with orthogonal first pin, cam slots, and a jaw adapter yoke, allowing for linear and rotational motion to transition jaw members between open, closed, and locked configurations, facilitated by a spring release mechanism for controlled deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing endoscopic hemostatic clips are used, then the procedure can be performed, but tissue grasping effectiveness is insufficient and re-bleeding occurs
Solution Approach 1:
The jaw members are designed to rotate about the first pin between open, closed, and locked configurations, transitioning from a static clip design to a dynamic one that can actively grasp and secure tissue. This rotational movement allows the jaws to adapt to tissue contours and apply controlled closing force, improving grasping effectiveness and preventing re-bleeding.
Solution Approach 2:
The clip assembly is divided into separate functional components: the jaw assembly with rotating jaws, the delivery catheter, and the locking mechanism. This segmentation allows each component to be optimized independently - the jaws for tissue grasping, the delivery system for minimally invasive access, and the locking mechanism for secure fixation - thereby improving overall reliability while reducing re-bleeding.
2Reliability
If existing hemostatic clip mechanisms are used, then deployment is possible, but the locking mechanism is insufficient
Solution Approach 1:
The locking mechanism utilizes the existing first pin and cam slot geometry to automatically lock the jaw members in place when rotated to the closed configuration. The cam slot's shaped profile causes the second pin to engage with locking features on the jaw members, creating a self-locking mechanism that secures the tissue grasp without requiring additional active locking components, thereby maintaining reliability while controlling complexity.
Solution Approach 2:
The cam slots are designed with curved profiles that guide the second pin through a specific rotational path. This curvature transforms the linear motion of the delivery catheter into rotational motion of the jaw members about the first pin, enabling the locking action through geometric design rather than complex mechanical linkages, thus achieving secure locking with controlled device complexity.
3Length of moving object
If traditional clip delivery systems are used, then deployment can be achieved, but the deployed clip body length is excessive
Solution Approach 1:
The jaw members rotate about the first pin during deployment, allowing the clip body to collapse or fold to a shorter length after tissue grasping. This dynamic configuration change enables the clip to be delivered through a catheter and then compacted to a shorter deployed length, reducing the length parameter while the manufacturing complexity is managed through the straightforward rotational hinge design.
4Ease of operation
If existing delivery catheters are used, then linear motion transmission is possible, but torsion transmission to the distal clip assembly is insufficient
Solution Approach 1:
The cam slots are positioned and oriented to convert linear motion of the delivery catheter along its longitudinal axis into rotational motion of the jaw members about the first pin. The curved geometry of the cam slots acts as a mechanical transformer, enabling torsion transmission to the distal clip assembly through the existing linear delivery mechanism without requiring complex additional components, thus improving ease of operation while controlling device complexity.
Data Source
AI summary
A device for applying a hemostatic clip assembly includes a proximal delivery catheter having a handle assembly and an elongated catheter body defining a longitudinal axis extending distally from the handle assembly, and a distal clip assembly removably connected to a distal end of the catheter body. The distal clip assembly includes a distal clip housing, a jaw assembly and a jaw adapter yoke. The jaw assembly has a pair of jaw members fixed to the distal clip housing by a first pin oriented orthogonally relative to the longitudinal axis. The jaw adapter yoke is operatively connected to the jaw members. The proximal delivery catheter is configured to transmit linear motion along and torsion about the longitudinal axis to at least a portion of the distal clip assembly. At least one of the jaw members is configured to rotate about the first pin between an open and a closed configuration.