Mid-point Lock Suture Cutter for Endoscopic Access
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Solution Overview
Problem
Conventional surgical instruments are inadequate for accurately and efficiently cutting sutures in restricted access areas during endoscopic procedures, particularly when access is limited through small incisions or cannulas.
Innovation Solution
A surgical cutter with a distal cutter assembly and a 'wishbone' handle configuration, featuring a mid-point locking mechanism that allows the suture to slide when locked and cuts when the handles are brought closer, enabling precise manipulation and cutting of sutures within the cannula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional surgical scissors are used to cut sutures in restricted access areas, then the surgeon can perform cutting operations, but the procedure becomes difficult and time-consuming due to limited access through small incisions or cannulas
Solution Approach 1:
The surgical instrument is divided into distinct functional segments: a handle portion for manipulation, a shaft portion for transmission, and a cutting assembly with jaws for cutting. This segmentation allows each component to be optimized for its specific function while working together as an integrated system that can operate in restricted spaces.
Solution Approach 2:
The cutting assembly with movable jaws is nested within the shaft portion, allowing the cutting mechanism to be compact when not in use and extend or activate only when needed. This nesting enables the instrument to pass through small incisions or cannulas while still providing effective cutting capability at the distal end.
2Adaptability or versatility
If conventional surgical instruments are used in endoscopic procedures, then basic cutting functions can be performed, but the instruments lack the ability to hold and manipulate sutures effectively in confined spaces
Solution Approach 1:
The cutting assembly is designed to perform multiple functions: the jaws can grasp and hold the suture material, position it for cutting, and then cut it when the handles are compressed. This multi-functionality eliminates the need for separate instruments for holding and cutting, reducing the number of steps and instruments needed during the procedure.
Solution Approach 2:
The functions of holding, positioning, and cutting the suture are merged into a single integrated cutting assembly at the distal end of the instrument. This combination allows the surgeon to perform multiple operations with one instrument, improving efficiency in restricted access areas.
3Measurement precision
If a cutting instrument is inserted through a cannula to reach the surgical site, then access to restricted areas is achieved, but the instrument must be held in a precise position to maintain suture tension without cutting
Solution Approach 1:
The handle portion incorporates a ratchet mechanism that allows dynamic control of the jaws' position. The ratchet can lock the handles in various positions to maintain suture tension during insertion and manipulation, and can be released when cutting is desired. This dynamic locking mechanism provides precise position control while maintaining ease of operation.
Solution Approach 2:
The ratchet mechanism provides mechanical feedback to the surgeon through tactile sensation, indicating when the handles are locked in position and when they can be moved. This feedback system allows the surgeon to maintain precise control over the instrument's position and the suture tension without requiring visual confirmation or complex controls.
Data Source
AI summary
A surgical suture cutter that has a “wishbone” configuration and is provided with a locking mechanism having a mid-point lock that allows two operating handles to be locked in a predetermined position at which point the cutting jaw is held flush with the shaft but suture between the jaws of the cutter is allowed to slide without being cut. The locking mechanism is formed of first and second members provided with a first engagement element (for example, a hook) and a second engagement element (for example, a notch), to allow secure engagement of the first engagement element when the suture cutter instrument is in the mid-point locked position.