Reciprocating Surgical Instrument with Suction and RF Ablation
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Solution Overview
Problem
Current surgical instruments with rotational cutting surfaces, such as shavers and burrs, face challenges in providing precise control and creating flat surfaces, especially in confined spaces, due to moment forces and the risk of grabbing adjacent soft tissues.
Innovation Solution
Development of reciprocating surgical rasping systems with flat cutting surfaces and suction capabilities, converting rotational motion into reciprocating motion for enhanced control and efficient tissue removal, and integration of RF ablation for soft tissue management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotational cutting surfaces (shavers and burrs) are used, then tissue removal capability is achieved, but control precision and ability to create flat surfaces deteriorate due to moment forces
Solution Approach 1:
The patent inverts the conventional rotary cutting motion by implementing a reciprocating linear motion mechanism. The cutting element moves back and forth in a straight line rather than rotating, which eliminates the moment forces that cause control difficulties and enables precise flat surface creation while maintaining effective tissue removal capability
Solution Approach 2:
The patent employs periodic reciprocating motion where the cutting element alternates between forward and backward movements. This periodic linear action provides consistent cutting performance while allowing the surgeon to maintain precise control and create flat surfaces, resolving the contradiction between productivity and manufacturing precision
2Productivity
If rotational cutting surfaces are used, then tissue removal is achieved, but safety deteriorates due to risk of grabbing adjacent soft tissues
Solution Approach 1:
By inverting the rotational motion to linear reciprocating motion, the cutting element moves in a controlled straight line that does not rotate. This eliminates the grabbing effect on adjacent soft tissues while maintaining the ability to effectively remove target tissue, thus resolving the safety contradiction
3Manufacturing precision
If reciprocating motion is implemented, then control precision improves, but device complexity increases due to motion conversion mechanism
Solution Approach 1:
The patent utilizes the dynamic properties of the reciprocating mechanism, where the cutting element's linear back-and-forth motion is generated through a motion conversion system. This dynamic approach achieves superior control precision for creating flat surfaces while the mechanism's design optimizes the complexity-performance trade-off
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 reciprocating motion provides better axial direction control, reduces injury to surrounding tissues, and allows for efficient debris removal, while the integrated RF ablation capability simplifies procedures by handling both hard and soft tissues with fewer instruments.
Implementation Method 1
an opening to a suction path may be located between the jaws
Implementation Method 2
integration of RF ablation for soft tissue management
Data Source
AI summary
A surgical instrument system functional in multiple orthopedic applications, including but not limited to shoulder, knee, hip, wrist, ankle, spinal, or other joint procedures. The system comprises a cutting head which includes jaw members which may be urged between open and closed positions to providing a biting or chewing action for removal of targeted tissues. The instrument system is configured to be driven by an attached hub that translates a rotational movement into a reciprocating motion to open and close the jaw members. Suction for removal of bone fragments or other tissues is provided through a suction opening.