Surgical Leg Positioning Unit for Stable Knee Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for applying torsional forces to the knee joint during surgery are inconsistent, unstable, and require manual application by a second person, limiting precision and stability.
Innovation Solution
A surgical leg positioning unit that attaches to the operating table, allowing for precise and stable torque application to the knee joint through adjustable components, including a soleplate, resistive post, and support frame, enabling independent control of varus/valgus stresses and flexion/extension without penetrating the surgical drape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual application of torsional forces by a second person is used, then the knee joint can be stressed, but the application is inconsistent, unstable, and requires additional personnel
Solution Approach 1:
The surgical table is modified to provide self-service torque application capabilities through integrated foot stirrups and thigh rests that can be independently positioned. The system eliminates the need for a second person to manually apply forces by providing mechanical support structures that automatically maintain stable positioning and apply consistent torsional stress to the knee joint during surgery.
Solution Approach 2:
The patent introduces mechanical intermediaries (foot stirrups and thigh rests) between the surgeon and the patient's leg. These intermediaries provide stable, reproducible positioning and force application, replacing the inconsistent manual application by a second person with precise mechanical structures that can be independently adjusted and maintained.
2Measurement precision
If manual torque application is used, then knee stress can be applied, but precision and stability are limited
Solution Approach 1:
The foot stirrups and thigh rests are designed with independent adjustability along the longitudinal axis of the table, allowing dynamic positioning to match different patient anatomies and surgical requirements. This dynamic adjustment capability enables precise control of torque application while maintaining ease of operation through straightforward mechanical positioning mechanisms.
3Productivity
If a second person applies forces manually, then knee manipulation is possible, but surgical efficiency is reduced
Solution Approach 1:
The modified surgical table provides self-service functionality by incorporating adjustable foot stirrups and thigh rests that automatically maintain proper positioning and apply stable torsional forces. This eliminates the need for a second person to assist with manual force application, allowing the primary surgeon to perform all surgical tasks independently and improving overall surgical efficiency.
Data Source
AI summary
The present invention provides a fixture that may be releasably attached to the operating table to apply two countervailing forces to the leg on opposite sides of the knee. These forces permit the application of a precise and stable torque to the knee joint. In one embodiment, the fixture may be repositioned and fixed with respect to the operating table through the surgical drape without penetration of the surgical drape.