Lisfranc Compression Device With Ratchet Retention
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Solution Overview
Problem
Existing Lisfranc reconstructive surgeries face challenges in firmly holding the Lisfranc joint complex in place under compression during the insertion of implants like Lisfranc screws, often relying on conventional surgical clamps or brackets which may not provide adequate stability and ease of use.
Innovation Solution
A Lisfranc reconstruction device with manually compressible operator grips and a mechanical linkage that transforms arcuate motion into relative translation of a barrel and jaw, equipped with a retention mechanism to maintain compression, allowing precise positioning and insertion of screws or other implements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surgical clamps or brackets are used to hold the Lisfranc joint complex in place, then the device can be applied to the joint, but it does not provide adequate stability and ease of use
Solution Approach 1:
The device is divided into separate functional components: first and second operator grips for manual operation, a barrel for positioning, and a jaw for compression. This segmentation allows each component to be optimized for its specific function while maintaining overall ease of use and reliability.
Solution Approach 2:
A mechanical linkage acts as an intermediary between the operator's manual compression of the grips and the compression force applied to the Lisfranc joint complex. This linkage transforms the operator's input motion into controlled axial translation of the barrel and jaw, providing both stability and ease of operation.
2Reliability
If conventional surgical clamps or brackets are used for compression, then the device can be applied to the joint, but it does not provide adequate stability
Solution Approach 1:
The device segments the compression mechanism into distinct components (grips, barrel, jaw) with specific functions, allowing for improved stability through specialized design while keeping the overall device manageable in complexity.
Solution Approach 2:
The device incorporates dynamic elements including movable grips that translate along arcuate paths and a mechanical linkage that converts this motion into controlled axial translation. This dynamic design provides stable compression while adapting to the surgical procedure's requirements.
3Manufacturing precision
If manual compression is applied to the Lisfranc joint complex, then the joint can be held in place, but precise positioning and controlled compression are difficult to achieve
Solution Approach 1:
The mechanical linkage serves as an intermediary that translates the operator's manual compression of the grips into precise, controlled axial translation of the barrel and jaw. This intermediary mechanism ensures positioning precision while maintaining ease of operation through simple manual compression.
Solution Approach 2:
The device transforms the operator's compression motion from a linear force application into controlled axial translation along a specific path. The arcuate motion of the grips is converted into linear axial translation of the compression members, enabling precise positioning in the surgical field.
4Stability of the object's composition
If a retention mechanism is added to maintain compression, then the relative position of barrel and jaw can be retained, but the device complexity increases
Solution Approach 1:
The retention mechanism is designed to automatically maintain compression once activated. The mechanical design allows the barrel and jaw to retain their relative position without continuous external force, providing self-service compression maintenance while adding minimal complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device enables secure and controlled compression of the Lisfranc joint complex, facilitating precise placement of implants and subsequent reconstruction by converting manual grip motion into axial translation, enhancing surgical precision and stability.
Implementation Method 1
The mechanical linkage is designed such that the arcuate motion of the grips is mechanically transformed into relative translation of the barrel and the jaw
Implementation Method 2
The device is equipped with a retention mechanism, such as a ratchet mechanism, that retains the relative position of the barrel and jaw relative to one another when the desired degree of compression has been reached
Data Source
AI summary
A Lisfranc reconstruction device includes a pair of operator grips mechanically linked to a first arm that includes a barrel and a second arm that includes a jaw whereby motion of the grips is mechanically transformed into relative translation of the barrel and the jaw for compression of a portion of a Lisfranc joint complex therebetween. The device includes a retention mechanism, such as a ratchet, to enable retention of the barrel and jaw when the desired position has been reached. The device may be provided in the form of a kit that includes a wire guide sleeve, a pilot wire, and a Lisfranc screw, in particular a cannulated Lisfranc screw that is sized to travel over the wire in a defined trajectory to facilitate proper screw placement. The device may be used for reconstruction of a traumatic injury to the Lisfranc joint complex.