Cannula Fixation Clamp with Rotational Isolation
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Solution Overview
Problem
Conventional cannula fixation sleeves fail to maintain a secure seal and stable positioning of cannulas during surgical procedures, particularly under rotational movements, which can lead to leakage and tissue trauma due to the transfer of rotational forces to sutures, compromising the seal and stability.
Innovation Solution
A cannula fixation device with a rotatable clamp mechanism that securely fixes the cannula axially while allowing rotational movement, preventing the transfer of rotational forces to the sutures and maintaining a seal with the body wall, and is designed for easy cleaning and potential reuse with biomedical-grade materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fixation sleeve is sutured to the body wall to hold the cannula, then the cannula is secured in position, but rotational forces are transferred to the sutures causing tissue trauma and compromising the seal
Solution Approach 1:
The fixation device is divided into functionally independent components: a fixation sleeve that remains stationary and is sutured to the body wall, and a cannula holder that rotates independently within the sleeve. This segmentation allows the sleeve to provide stable sealing while the holder absorbs rotational movements, preventing force transfer to the sutures and eliminating tissue trauma.
Solution Approach 2:
The cannula holder acts as an intermediary element between the cannula and the fixation sleeve. It receives and isolates rotational forces generated during surgery, preventing these forces from being transmitted to the sutures securing the sleeve. This mediator component protects the seal stability while allowing necessary rotational movement of the cannula.
2Stability of the object's composition
If the fixation sleeve is locked to prevent cannula movement, then axial stability is achieved, but rotational movement is restricted causing operational limitations
Solution Approach 1:
The cannula holder is designed with dynamic characteristics that allow it to rotate freely within the fixation sleeve while maintaining axial positioning. This dynamic design enables the cannula to achieve necessary rotational freedom for surgical operations while the holder's engagement with the sleeve maintains stable axial position, resolving the contradiction between stability and operability.
3Manufacturing precision
If a complex locking mechanism is used to secure the cannula, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The fixation function is segmented between the fixation sleeve and the cannula holder, with each component having a simple, specialized design. The sleeve provides stable mounting with minimal complexity, while the holder provides precise positioning through its engagement mechanism. This segmentation allows accurate cannula positioning without requiring an overly complex overall device structure.
Data Source
AI summary
A cannula fixation device for insertion at a surgical incision includes a sleeve having a passage configured to receive a cannula, and a clamp configured to rotatably couple the cannula to the sleeve and to maintain an axial position of the cannula relative to the sleeve.