Hip Joint Prosthetic Positioning Shaft Alignment
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Solution Overview
Problem
Current hip joint replacement surgeries are challenging due to the difficulty in accurately placing prosthetic components, leading to potential errors and prolonged recovery times, especially in the hip joint where limited reach and visibility complicate the correct alignment and fixation of artificial surfaces.
Innovation Solution
The development of an implantable medical device with a positioning shaft and holes in the artificial hip joint surfaces allows for precise alignment and fixation using a positioning shaft inserted into the femoral and pelvic bones, enabling accurate placement and stabilization of artificial caput femur and acetabulum surfaces within the hip joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional hip joint replacement surgery is performed without a positioning shaft, then the surgery can be completed with standard procedures, but the placement precision of prosthetic components is poor and errors are frequent
Solution Approach 1:
The positioning shaft serves as an intermediary tool between the surgeon and the prosthetic components. It is inserted into the hip joint and used to guide and align the artificial caput femur and acetabulum surfaces during implantation, ensuring precise placement while simplifying the overall surgical process through standardized positioning procedures
2Ease of operation
If the hip joint capsule is penetrated to access the joint, then access to the joint is achieved, but the healing ability and functionality of the joint are compromised
Solution Approach 1:
The surgical approach is segmented into two parts: accessing the joint through the capsule for positioning the shaft, and then implanting the prosthetic components. This allows controlled access while preserving the capsule's integrity as much as possible, facilitating better healing compared to complete capsule disruption
3Manufacturing precision
If multiple manual positioning attempts are made without a positioning shaft, then the prosthesis can be placed, but the process is time-consuming and error-prone
Solution Approach 1:
The positioning shaft is preliminarily inserted into the hip joint and positioned in the correct alignment before the prosthetic components are implanted. This preliminary positioning action serves as a guide for subsequent implantation, ensuring accurate alignment in a single attempt rather than requiring multiple adjustments during surgery
4Ease of operation
If limited visibility inside the hip joint is accepted, then the surgery can proceed with standard exposure, but the correct placement of prosthesis becomes difficult and time-consuming
Solution Approach 1:
The positioning shaft acts as a physical intermediary that provides tactile and visual reference points for correct prosthesis placement. Even with limited visual exposure, the shaft's position and orientation can be palpated and used as a reliable guide, ensuring accurate placement without requiring enhanced visibility or more extensive surgical exposure
Data Source
AI summary
An implantable medical device for implantation in a hip joint of a human patient is provided. The medical device comprises: at least one artificial hip joint surface adapted to replace at least the surface of at least one of the caput femur and acetabulum. At least one artificial hip joint surface comprises: a positioning hole with at least one opening in said at least one artificial hip joint surface. The hole is adapted to be placed and dimensioned such that the medical device is adapted to be fitted using a positioning shaft and at least partly surround the shaft, for positioning the at least one artificial hip joint surface in a desired position in the hip joint. The hole is adapted to be fitted using the positioning shaft, when the shaft is stabilized and placed in at least one of the femoral bone and the pelvic bone for positioning said medical device inside the hip joint.