Retractor Handle Jaw Locking Mechanism for Blade Anti-Rotation
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Solution Overview
Problem
Contemporary retractor systems face challenges in preventing the retractor shaft and blade from rotating during transfer and after connection to the frame, which can interfere with surgical procedures due to limited surface area for engagement and potential misalignment.
Innovation Solution
A handle with movable opposed jaws that can be locked to fix the retractor blade in place, allowing or preventing rotation based on user preference, using a combination of recesses and protrusions to securely engage the blade and maintain its position with minimal user effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the retractor shaft has a low profile with minimal extension above the retractor frame, then clearance and space for the surgical procedure is improved, but the surface area available for the handle and frame to engage the shaft is reduced, making it difficult to prevent rotation
Solution Approach 1:
The solution moves the engagement interface from a vertical dimension (shaft extension height) to a radial dimension (disc-shaped member circumference). The disc-shaped member on the shaft provides a large circumferential surface area for engagement by the handle jaws and frame clamps, eliminating the need for vertical shaft extension while maintaining anti-rotation capability through multi-point engagement around the disc's circumference.
2Adaptability or versatility
If the handle allows the retractor blade to rotate relative to it, then user preference for adjustability is satisfied, but the blade may rotate during positioning and transfer, interfering with surgical procedures
Solution Approach 1:
The handle incorporates a lockable mechanism that allows the blade to transition between two states: unlocked for rotation/adjustment and locked for fixed positioning. The movable opposed jaws can be positioned to engage or disengage from the disc-shaped member, enabling the blade to rotate when needed and remain fixed when required, thus providing both adaptability and operational control.
3Reliability
If the handle jaws are designed to firmly grip the retractor shaft to prevent rotation, then reliability of blade positioning is improved, but the complexity of the handle mechanism increases
Solution Approach 1:
The anti-rotation function is separated from the holding function. The disc-shaped member on the shaft provides a dedicated engagement interface that simplifies the handle jaws' design - they only need to grip the disc's circumference rather than complex shaft features. This segmentation allows reliable positioning through simple radial engagement while maintaining handle mechanism simplicity.
Data Source
AI summary
A retractor system includes one or more blades, a handle, and a frame. The handle includes first and second arms with jaw portions and recesses configured to removably retain a blade. Both arms include rotatable connections and handles, where the rotatable connections are between jaw portions and handles. The rotatable connections are connected together such that the arms are rotatable with respect to one another. In one embodiment, the recesses are partial disc shapes opposed to one another, such that when the jaw portions are in a closed position, a disc-shaped space is present between the jaw portions in the closed position. The blade includes a corresponding disc-shape protrusion that may be retained in the recesses, and in some embodiments may include one or more notches to mate with a protrusion in a recess that prevents blade rotation while in the handle.