Pelvic Stabilization Device with Rotating Angle Indicator
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Solution Overview
Problem
During total hip arthroplasty (THA) in a lateral position, the anteroposterior inclination of the pelvis varies, leading to unclear target reference surfaces and insufficient cup placement accuracy due to pelvic movement during surgery.
Innovation Solution
A body position fixing apparatus with a fixing device and an angle indicator that includes pressing surfaces and a rotation mechanism to stabilize the patient's pelvis and accurately align the cup placement with anatomical planes, improving the precision of cup placement by stabilizing the patient's position and providing a reference for the correct angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If treatment is performed in lateral position, then operative field visibility and leg mobility are improved, but pelvic stability and cup placement accuracy deteriorate
Solution Approach 1:
The fixing device is attached to the patient's body before the THA procedure begins, establishing a stable reference frame in advance. The pressing surfaces are positioned against anatomical landmarks (anterior superior iliac spines and pubic symphysis) to pre-stabilize the pelvis, preventing movement during subsequent surgical steps and ensuring accurate cup placement.
Solution Approach 2:
The fixing device acts as an intermediary between the patient's body and the surgical procedure. By introducing this intermediate stabilization system with pressing surfaces and reference planes, the device mediates the conflict between lateral positioning benefits and pelvic stability requirements, enabling both good surgical access and accurate cup placement.
2Ease of operation
If patient is positioned in lateral position, then surgical access is improved, but pelvic movement increases causing unclear reference surfaces
Solution Approach 1:
The fixing device is attached to the patient's body before the THA procedure begins, establishing a stable reference frame in advance. The pressing surfaces are positioned against anatomical landmarks (anterior superior iliac spines and pubic symphysis) to pre-stabilize the pelvis, preventing movement during subsequent surgical steps and ensuring accurate cup placement.
Solution Approach 2:
The fixing device acts as an intermediary between the patient's body and the surgical procedure. By introducing this intermediate stabilization system with pressing surfaces and reference planes, the device mediates the conflict between lateral positioning benefits and pelvic stability requirements, enabling both good surgical access and accurate cup placement.
Data Source
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AI summary
A body position fixing apparatus includes: a first pressing tool including a first pressing surface to be pressed against one of a pair of anterior superior iliac spines of the human body, that is closer to the placement surface; a second pressing tool including a second pressing surface to be pressed against another one of the pair of anterior superior iliac spines, that is more distant from the placement surface; a third pressing tool including a third pressing surface to be pressed against a pubic symphysis of the human body; a fourth pressing tool including a fourth pressing surface that faces the first pressing surface, the second pressing surface, and the third pressing surface, and that is to be pressed against a back of a lumbar region of the human body; an indicating rod; and a rotation mechanism that supports the indicating rod to make the indicating rod rotatable at a discretionary angle relative to each of the placement surface and a fixed reference plane including the first pressing surface, the second pressing surface, and the third pressing surface.