Prosthetic Adaptor Resilient Bush Axial Locking
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Solution Overview
Problem
Existing prosthetic adapters for osseointegration require replacement of breaking devices under excessive torque, leading to inconvenience for users, especially when specialists are not readily available.
Innovation Solution
A prosthetic adapter with a resilient bush and locking ring mechanism that compresses axially to expand radially, providing frictional forces to prevent rotation under normal conditions and allowing rotation when excessive torque is applied, without breaking components, allowing users to realign the parts without professional assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breaking device is used to allow rotation under excessive torque, then the adaptor can protect against damage, but the breaking device must be replaced by a specialist causing user inconvenience
Solution Approach 1:
The resilient bush allows the user to manually compress it axially to expand it radially, enabling self-service realignment of the male and female parts without requiring a specialist. The breaking device in prior art required specialist replacement, but this invention empowers the user to perform the realignment themselves by simply compressing the resilient bush.
Solution Approach 2:
The resilient bush changes its radial dimension in response to axial compression. When compressed axially, it expands radially to lock the parts; when released, it contracts to allow realignment. This parameter change enables the user to switch between locked and unlocked states without specialist intervention.
2Ease of operation
If a breaking device is used to disengage under excessive torque, then rotational locking can be released, but components break causing damage and requiring specialist repair
Solution Approach 1:
Instead of allowing components to break under excessive torque, the resilient bush deforms elastically to absorb the excessive torque. The permanent deformation of the resilient bush serves as a warning that excessive torque has been applied, but no critical components are damaged. This converts the harmful breaking mechanism into a beneficial elastic deformation mechanism.
Solution Approach 2:
The resilient bush acts as a cushion that absorbs excessive torque before it can cause damage to critical components. By being pre-installed in the adaptor, it provides beforehand protection against the harmful effects of excessive torque, preventing component breakage while still allowing rotation release.
3Reliability
If axial locking means are used to secure the adaptor, then sufficient axial locking is guaranteed, but the locking mechanism becomes more complex
Solution Approach 1:
The invention combines the axial locking and rotational locking functions into a single resilient bush component. The same resilient bush that provides axial locking through its frictional engagement also provides rotational locking when compressed axially to expand radially. This merging reduces the number of separate locking mechanisms and simplifies the overall device complexity.
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
Enables continuous use of the prosthetic adapter by preventing component damage from excessive torque, allowing users to realign the parts without needing a specialist, and providing damping of oscillations between the male and female parts.
Implementation Method 1
the female part further comprises an at least partially resilient bush arranged in the cavity and being configured to expand in a radial direction when the bush is compressed in an axial direction
Implementation Method 2
any rotation between the male part and female part is subjected to frictional forces that increase with the pushing force exerted by the resilient bush onto the male part
Implementation Method 3
the locking ring is configured to compress the bush in the axial direction such that the bush expands in the radial direction to thereby lock a rotation of the male part relative to the female part
Implementation Method 4
An additional beneficial effect is related to the damping of oscillations between the male part and the female part by the resilient bush
Data Source
AI summary
The present invention relates to an adaptor for mounting a prosthesis to a prosthetic pin that protrudes from a user's body. The adaptor comprises a male part coupled to a prosthetic pin, a female part coupled to the prosthesis and to the male part, and a locking ring for locking a rotation of the male part relative to the female part. According to the invention, the female part further comprises an at least partially resilient bush arranged in the female part that is configured to expand in a radial direction when the bush is compressed in an axial direction to lock a rotation of the male part relative to the female part.