Medical Hand Instrument Joint Driveshaft for Simultaneous Stroke and Rotation
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Solution Overview
Problem
Existing medical and dental hand instruments with simultaneous stroke and rotational movement mechanisms are complex and costly due to the need for multiple gears and components, which complicates production and assembly while occupying more internal space.
Innovation Solution
A simplified design featuring a single joint driveshaft with integrated rotary and stroke gears, where the drive-side elements of both gears are disposed on the driveshaft, allowing for simultaneous stroke and rotational movement of the tool-holding device without interrupting the motion, using a gearwheel and pin configuration that enables continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple separate gears and components are used for simultaneous stroke and rotational drive, then the functional capability is achieved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the drive-side elements of both the rotary gear and stroke gear onto a single driveshaft. This merging of previously separate components into one integrated driveshaft reduces the number of parts, simplifies assembly, and lowers production costs while maintaining the capability to generate both rotational and stroke movements simultaneously.
Solution Approach 2:
The single driveshaft serves multiple functions by carrying both the rotary gear drive-side element and the stroke gear drive-side element. This multi-functional design allows one component (the driveshaft) to perform the role of what would traditionally require separate shafts, thereby reducing overall device complexity without sacrificing functional capability.
2Ease of manufacture
If multiple separate gears and components are used for simultaneous stroke and rotational drive, then the functional capability is achieved, but production and assembly costs increase
Solution Approach 1:
By merging the drive-side elements of both gears onto a single driveshaft, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation directly improves ease of manufacture and assembly while reducing device complexity.
3Volume of moving object
If multiple separate gears and components are used for simultaneous stroke and rotational drive, then the functional capability is achieved, but the internal space required increases
Solution Approach 1:
The consolidation of both gear drive-side elements onto a single driveshaft reduces the spatial footprint required for the gear mechanism. This merging eliminates the need for separate shafts and their associated mounting structures, thereby reducing the internal space required within the hand instrument while maintaining the complex simultaneous stroke and rotational drive functionality.
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
This design reduces production and assembly costs, simplifies the internal structure, and allows for a more compact and efficient simultaneous stroke and rotational movement of the tool-holding device, enhancing operational smoothness and reducing noise.
Implementation Method 1
a rotary gear (3), which is designed to induce a rotational movement of the tool-holding device and a stroke gear (4), which is designed to induce a stroke movement of the tool-holding device
Data Source
AI summary
A hand instrument, comprising: a tool-holding device for fastening a treatment tool on the hand instrument, a driveshaft for transmitting a driving movement to the tool-holding device and a stroke gear which is designed to induce the tool-holding device in a stroke movement. According to a first embodiment the hand instrument further has a rotary gear which is designed to induce the tool-holding device to a rotational movement, wherein a drive-side element of the rotary gear and a drive-side element of the stroke gear are arranged jointly on the driveshaft. According to a second embodiment the drive-side element of the stroke gear is designed such, that in a complete revolution of the drive-side element of the stroke gear the tool-holding device runs through more than a double stroke. According to another embodiment the drive-side element of the stroke gear is disposed concentrically around an axis of rotation of the driveshaft.