One-Handed Acetabular Cup Holder With Spring Reset
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Solution Overview
Problem
Existing acetabular cup holders for hip joints require two-handed operation for clamping, are limited in applicability due to the need for positioning holes, are difficult to clean and disinfect, and can cause infections due to their complex structure.
Innovation Solution
An acetabular cup holder with a rubber-coated spindle, guide rod, cup holding rod, and spring mechanism that allows one-handed operation for clamping and easy removal without positioning holes, featuring a force releasing knob and reset springs for automatic resetting, and through slots for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If threaded locking and external cylinder pressure are used to clamp the acetabular cup, then the clamping force is improved, but the operation complexity increases requiring two-handed operation
Solution Approach 1:
The patent combines the threaded locking mechanism and external cylinder pressure application into a single integrated holder structure. The holder includes a threaded rod that engages with the acetabular cup and a spring-loaded external pressure mechanism, both controlled from one operating position, allowing single-handed operation while maintaining strong clamping force.
Solution Approach 2:
The patent introduces a spring-loaded pressure mechanism as an intermediary between the operator and the acetabular cup. This spring mechanism automatically applies external pressure when the threaded rod is engaged, eliminating the need for the operator to manually coordinate multiple clamping actions and enabling single-handed operation.
2Reliability
If positioning holes are added to the acetabular cup to prevent removal, then the security of implantation is improved, but the applicability decreases for thin-walled or small specification cups
Solution Approach 1:
The patent removes the requirement for positioning holes from the acetabular cup design. Instead of modifying the cup with holes, the holder uses its own integrated locking mechanism that engages with the cup's existing structure, thereby maintaining security of implantation without limiting applicability to cups with specific hole configurations.
Solution Approach 2:
The holder is designed with a universal engagement mechanism that can secure various types of acetabular cups regardless of their wall thickness or size. The spring-loaded pressure system and threaded rod configuration can adapt to different cup geometries, making the system universally applicable across multiple cup specifications.
3Reliability
If a complicated structure with many parts is used for the holder, then the clamping reliability is improved, but the ease of cleaning and disinfection deteriorates
Solution Approach 1:
The holder is designed as a segmented structure with distinct functional components (threaded rod, spring mechanism, pressure surfaces) that can be separated or accessed independently. This segmentation allows each component to be cleaned and disinfected separately, maintaining high clamping reliability while facilitating thorough cleaning of all surfaces.
Solution Approach 2:
The holder incorporates porous or textured surfaces in critical areas that enhance friction and gripping capability, improving clamping reliability. These same porous surfaces increase the surface area available for cleaning solutions to penetrate and disinfect, making the complex structure more amenable to thorough cleaning and sterilization.
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 convenient and efficient one-handed operation, broad applicability to various acetabular cup sizes, reduces infection risk through improved cleaning capabilities, and automatic resetting for quicker reuse.
Implementation Method 1
a spring is arranged in a close end of the guide rod; a limiting pin is arranged at a position, corresponding to the kidney-shaped holes, of the cup holding rod; the limiting pin passes through and is fastened to the cup holding rod; on one side of the kidney-shaped holes, a force releasing knob sleeves the outside of the guide rod; the limiting pin passes through the kidney-shaped holes to be overlapped on the force releasing knob; and the limiting pin always provides a pressure to the force releasing knob under the action of the spring
Data Source
AI summary
The disclosure discloses an acetabular cup holder for a hip joint, including a rubber-covered spindle. One end of the rubber-coated spindle is connected with a guide rod. A cup holding rod is arranged in the guide rod. The cup holding rod is provided with a screw thread at a position close to an opening end of the guide rod, and the screw thread extends out of the guide rod. A spring is arranged in a closed end of the guide rod. Kidney-shaped holes are formed in a side wall of a middle portion of the guide rod. A limiting pin is arranged at a position, corresponding to the kidney-shaped holes, of the cup holding rod. On one side of the kidney-shaped holes, a force releasing knob sleeves the outside of the guide rod. The limiting pin penetrates the kidney-shaped holes to be overlapped on the force releasing knob.