Surgical Table Segment Mechanism for Hip Extension
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Solution Overview
Problem
Current surgical tables for direct anterior hip surgery are cumbersome, expensive, and require additional personnel, with risks of contamination and femoral fractures due to the need for external traction and mechanical elevators.
Innovation Solution
A surgical table with a folding platform mechanism using a motor and rotary threaded worm gear for controlled hip extension and a femoral elevator plate with a sliding motorized wedge for safe elevation of the femoral bone, eliminating the need for traction hooks and reducing the risk of fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialty designed tables such as the Hannah table are used, then hip extension and femoral elevation are achieved, but the table becomes cumbersome, expensive, and requires large storage space
Solution Approach 1:
The surgical table is divided into a proximal segment for the torso-pelvic region and a distal segment for the lower extremities, with the junction at the hip joint level. This segmentation allows independent positioning of each segment to achieve hip extension without requiring a completely specialized table design.
Solution Approach 2:
The surgical table is designed to perform multiple functions: it provides hip extension through segmental positioning, supports the patient's body, and accommodates standard surgical equipment. This multi-functionality eliminates the need for completely specialized tables while maintaining surgical capabilities.
2Reliability
If the operated leg is lowered down to provide hip joint extension, then exposure of the proximal femur is improved, but the foot becomes very close to the floor increasing contamination risk
Solution Approach 1:
Instead of lowering the leg vertically to achieve hip extension, the table elevates the proximal segment (torso-pelvic region) in a different dimensional approach. This maintains the foot at a safe height from the floor while achieving the necessary hip extension for surgical exposure.
3Reliability
If retractors and bone hooks are used to elevate the femur, then the proximal end of the femur can be raised for reaming, but excessive traction may cause femoral fracture
Solution Approach 1:
The invention eliminates the need for traction hooks and suspension devices by integrating the elevation function directly into the table structure. The proximal segment elevation mechanism raises the femur without requiring external traction devices that could cause fracture.
Solution Approach 2:
The table's proximal segment acts as an intermediary mechanism between the patient's body and the surgical field. By elevating this segment, the system indirectly raises the femur to the appropriate position for reaming without applying direct traction forces that could cause fracture.
4Reliability
If elaborate femoral bone mechanical elevators such as the Wixson Anterior suspension Hook System are attached to the table, then femoral elevation is achieved, but the devices become cumbersome and may get in the way of the operating surgeon
Solution Approach 1:
The femoral elevation function is merged with the table's proximal segment positioning mechanism. This integration eliminates the need for separate, cumbersome elevation devices that could obstruct the surgeon's access to the surgical field.
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
Facilitates minimally invasive anterior surgical approaches with improved exposure and reduced risk of complications, allowing for safer and more efficient hip replacement procedures without the need for external traction or cumbersome devices.
Implementation Method 1
The lifting mechanism of the torso pelvic platform comprises motor and rotary threaded worm gear
Implementation Method 2
a femoral elevator plate which is moved upward proximally using a sliding motorized wedge
Data Source
AI summary
Surgical table for providing hyperextension of the hip joint during direct anterior approach without need for lowering the distal end of the operating table. The attachment will allow external rotation as well as adduction for better exposure of the proximal end of the femur. It further allow for motorized traction of the lower extremity controlled by the operating surgeon. The inventive device conveniently incorporates a femoral elevator mechanism that will raise the proximal end of the femoral bone for better visualization through the surgical wound and easier reaming of the femoral canal.