Arthroscopic Cutter Jaw Torque Amplification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current arthroscopic surgical procedures lack efficient tools for rapid removal of soft tissue, relying on rotational cutting surfaces that are inadequate for this purpose.
Innovation Solution
A motor-driven arthroscopic cutter with an openable-closable jaw structure, enhanced by a gear mechanism that amplifies torque and allows for selective opening and closing of jaws, enabling effective cutting and removal of soft tissue, and optionally incorporating a mechanism for aspiration of resected tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotational cutting surfaces (shavers and burrs) are used for tissue removal, then the device can remove hard tissue, but the speed and efficiency of soft tissue removal is insufficient
Solution Approach 1:
The patent replaces the traditional rotational mechanical cutting system with a reciprocating jaw mechanism that uses sharp cutting edges. This substitution transforms the cutting action from rotational abrasion to linear shearing motion, enabling rapid soft tissue removal while maintaining cutting effectiveness through the sharp edges that cleanly sever tissue fibers.
Solution Approach 2:
The invention changes the motion parameter from continuous rotation to reciprocating linear motion. The jaw assembly moves back and forth in a reciprocating manner, creating high-speed cutting action that is particularly effective for soft tissue. This parameter change allows the cutting edges to engage and sever tissue rapidly during the forward stroke while retracting during the return stroke.
2Force
If a motor drive directly actuates the jaw structure, then the system is simpler, but the closing force and torque are insufficient for effective tissue resection
Solution Approach 1:
The patent introduces a gear mechanism as an intermediary between the motor drive and the jaw structure. This gear mechanism serves as a torque amplifier, converting the motor's rotational output into high-force linear motion that actuates the jaw assembly. The gear intermediary enables the system to generate sufficient closing force for effective tissue resection while maintaining a relatively simple overall structure.
3Productivity
If the jaw structure operates without torque amplification, then the device is simpler, but the ability to resect tissue effectively is reduced
Solution Approach 1:
The gear mechanism acts as a necessary intermediary to bridge the gap between motor output and the high forces required for tissue resection. Without this torque amplification intermediary, the motor would be unable to generate sufficient closing force on the jaw assembly to effectively cut through tissue, particularly denser or more resistant tissue types.
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 solution enables rapid and effective cutting and removal of soft tissue with increased torque and control, improving surgical efficiency in procedures like meniscectomy by allowing for precise tissue resection and aspiration, thereby enhancing surgical precision and speed.
Implementation Method 1
The hub structure may also include a gear mechanism configured to amplify an output torque of the motor drive to increase a closing force of the jaw structure
Implementation Method 2
The passageway is typically configured for connection to a negative pressure source which can provide for continuous or periodic aspiration or suction of resected tissue from the operative site
Data Source
AI summary
Arthroscopic cutters are used for resecting tissues, such as meniscal tissues, in meniscectomies or other arthroscopic procedures. The arthroscopic cutters have a shaft assembly with openable-closeable jaws at a working end of the shaft. A handpiece having a motor drive may be detachably coupled to a hub on a hub end of the handpiece. When the shaft is coupled to the handpiece, the motor drive will couple to the jaw structure to open and close the jaw structure to cut meniscal and other tissues.