Handheld Bone Planer With Angled Finger Rests and Chip Collection
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Solution Overview
Problem
Existing medical hand instruments for bone scraping in dentistry are ergonomically deficient, leading to user fatigue, reduced precision, and increased soft tissue injury due to suboptimal grip, angle, and blade design, with limitations in chip collection capacity and visibility.
Innovation Solution
A disposable bone planer with an ergonomic design featuring angled finger rests, a sharper spring-hardened steel blade, improved chip collection capacity, and enhanced visibility, allowing for precise and efficient bone scraping with reduced force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a straight rod handpiece is used, then the structure is simple, but user fatigue increases and precision decreases
Solution Approach 1:
The handpiece is designed with curved surfaces and ergonomic contours that follow the natural shape of the user's hand, replacing the straight rod design. The finger rests are arranged in a curved pattern around the handpiece body, creating an ergonomic grip that reduces fatigue while maintaining operational precision.
2Productivity
If the planer blade runs in a plane inclined relative to the longitudinal axis, then bone scraping is effective, but soft tissue injury increases
Solution Approach 1:
The blade plane angle is optimized to a specific range (30-60 degrees relative to the longitudinal axis) to balance scraping effectiveness with tissue safety. The cutting edge angle is precisely controlled at 15-30 degrees to achieve clean bone cuts while minimizing soft tissue damage. These parameter optimizations resolve the contradiction between productivity and harm reduction.
3Quantity of substance
If the chip chamber volume is small, then the instrument is compact, but collection capacity is limited
Solution Approach 1:
The chip chamber is nested within the handpiece body in a space-efficient configuration. The chamber is positioned to utilize the internal volume of the handpiece structure, allowing adequate collection capacity (sufficient for typical surgical procedures) while maintaining a compact external dimensions that fit comfortably in the user's hand.
4Productivity
If the working area is large, then bone removal is efficient, but incision size increases
Solution Approach 1:
The working area is concentrated in a localized region at the distal end of the handpiece, with the blade positioned to engage bone at a specific focal point. This localized working area enables efficient bone removal at the target site while requiring only a small incision, as the effective working dimension is minimized without sacrificing removal capability.
Data Source
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AI summary
The invention relates to a hand-held instrument (10) with a handpiece (20), with a planing bade (18; 60) arranged distally in relation to the handpiece, and with a chip chamber (30), of which the planing blade (18; 60) is designed for scraping bone in particular and is arranged such that chips scraped off by means of the planing blade pass into the chip chamber (30), and the planing blade (18; 60) extends in a plane inclined with respect to a longitudinal axis (22) of the handpiece (20). According to the invention, the handpiece (20) is designed as a grip with three finger rests (32, 34, 36) and with a proximal support rest (38), wherein the three finger rests (32, 34, 36) are inclined relative to one another such that the three finger rests (32, 34, 36), in a cross section through the handpiece (20), extend in pairs at an angle of less than 90° to each other.