Modular Hip Prosthesis Percutaneous Assembly
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Solution Overview
Problem
Current methods for hip or shoulder prosthesis placement are aggressive and pose significant risks to patients, with challenges in minimally invasive removal of the femoral/humeral head and implantation of a suitable prosthesis.
Innovation Solution
A new hip or shoulder prosthesis system comprising modular components assembled within the body, along with specialized instruments like a cannulated extractor, Kirschner wire centering device, head component insertion device, metaphyseal component insertion device, and diaphyseal nail insertion device, allowing for percutaneous placement through minimal incisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional prosthesis placement methods are used, then the prosthesis can be securely implanted, but the surgery becomes very aggressive with significant risks to the patient
Solution Approach 1:
The prosthesis is divided into modular components (head component, metaphyseal component, diaphyseal nail) that can be inserted and assembled separately through minimal incisions, avoiding the need for large open surgeries while ensuring secure implantation through precise modular assembly
2Ease of manufacture
If the femoral head is removed using traditional methods, then the prosthesis can be implanted, but the removal process causes significant tissue injury
Solution Approach 1:
The femoral head is extracted through a minimal incision using a specialized extraction device that allows removal of the head with minimal soft tissue disruption, enabling subsequent prosthesis implantation while significantly reducing tissue injury compared to traditional open methods
3Object-affected harmful factors
If modular prosthesis components are assembled in situ, then the surgery becomes less aggressive, but the device complexity increases
Solution Approach 1:
The prosthesis is segmented into modular components that simplify the surgical approach by allowing insertion through small incisions, while the components are designed with complementary features (threaded connections, tapered fits) that enable reliable assembly without requiring complex surgical techniques
Solution Approach 2:
Multiple functional elements (head replacement, metaphyseal support, diaphyseal fixation) are merged into an integrated modular prosthesis system that can be assembled in situ, reducing surgical aggression while maintaining structural integrity through combined component design
Data Source
AI summary
A hip/shoulder prosthesis includes: a head component; a metaphyseal component; a diaphyseal nail, and a locking device. The head component includes: a front face and rear face; with a bore, and first and second shaped recesses in the rear face. The metaphyseal component includes: a central transverse aperture at an angle to the metaphyseal component's axis; a first end configured for threaded engagement within the bore of the head component; and a longitudinal hole that begins at the second end, transects the transverse aperture and reaches the first end, to receive the locking device. The diaphyseal nail is inserted in the femoral or humeral canal, and includes: fastening apertures that receive corresponding screws for fastening the diaphyseal nail to the femur or humerus; a portion configured to be received within, and engage, the transverse aperture of the metaphyseal component, and a transverse hole configured to receive the locking device.