Pneumatic Osteotome Handpiece With Low-Friction Piston Liner
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Solution Overview
Problem
In orthopedic surgery, it is challenging to effectively cut through bone cement that has already been implanted, as existing osteotomes lack reliability and ease of use due to high friction and wear issues.
Innovation Solution
A pneumatically powered osteotome with a low-friction cylinder liner and a spherical piston design, featuring a piston return spring and washer, which reduces wear and enhances force transmission to the blade, allowing for efficient cutting through bone cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional osteotomes are used to cut through bone cement, then cutting function is provided, but high friction and wear reduce reliability and ease of use
Solution Approach 1:
The patent changes the material parameters of the cylinder liner by applying a specialized coating or using a specific material composition that reduces the coefficient of friction. This parameter change directly addresses the high friction and wear problem, improving reliability of the osteotome during cutting operations through bone cement.
Solution Approach 2:
The patent employs composite material construction for the cylinder liner, combining a base material with a low-friction coating or overlay. This composite approach reduces wear and friction while maintaining the structural integrity needed for reliable osteotome operation.
2Productivity
If conventional drive mechanisms are used, then force transmission is provided, but high friction reduces efficiency and extends maintenance requirements
Solution Approach 1:
By changing the friction parameter through specialized materials or coatings in the drive mechanism, the patent reduces energy loss to friction. This improves cutting efficiency by ensuring more of the input energy is converted to useful cutting force rather than being dissipated as heat through friction.
3Duration of action of stationary object
If conventional osteotomes are used, then cutting function is provided, but wear issues require frequent maintenance
Solution Approach 1:
The patent uses composite material construction with wear-resistant coatings or overlays on critical components. This extends the operational lifespan of the osteotome by protecting against wear, thereby reducing the frequency of maintenance and repair interventions.
Solution Approach 2:
By changing material parameters to enhance wear resistance, the patent extends device lifespan and reduces maintenance frequency. The modified materials maintain their properties over extended periods of use, allowing the osteotome to function reliably across multiple surgeries without requiring maintenance.
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
The osteotome achieves improved reliability and reduced wear, enabling efficient cutting through bone cement with minimized friction and extended device lifespan, suitable for multiple surgeries without maintenance.
Implementation Method 1
the drive mechanism further comprises a piston return spring located within the cylinder
Implementation Method 2
a coefficient of sliding friction of the cylinder liner material with the piston material is less than 0.20
Data Source
AI summary
Provided is an osteotome handpiece that may be driven by compressed gas. In an embodiment, a spherical piston may be movable inside a cylinder having a liner, which may be made of a low-friction material such as a fluoropolymer. The spherical piston may impact a blade holder that transmits force to a blade. A piston return spring may be provided, along with a piston washer to avoid any possible outward deformation of the spring. The blade holder may be retained by a split and threaded retaining collar. Single-stroke or multi-stroke operation may be chosen by the user. The device has long-operating low-maintenance advantages.