Differential Pressure Motor With Single-Hose Valve Switching
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Solution Overview
Problem
Current differential pressure motors used in medical lavage and debridement systems are complex, costly, and require extensive cleaning and sterilization, posing risks of infection and environmental contamination, while existing solutions lack sufficient power and reliability for effective tissue debridement and tool operation.
Innovation Solution
A simplified differential pressure motor design featuring two working pistons connected by a rod, with a valve piston that alternates pressure impacts to create a periodic linear movement, driven by ambient air pressure or underpressure, eliminating the need for batteries and complex gear units, and suitable for single-use disposable medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If compressed air-driven motors with dual hose systems are used, then the motor can operate without batteries, but the system complexity increases due to requiring separate supply and discharge hoses for unsterile air
Solution Approach 1:
The patent combines the air supply and discharge functions into a single coaxial hose system. The working piston alternately connects the hollow space to the atmosphere (air intake) and to the discharge opening (air exhaust) through valve control, eliminating the need for separate supply and discharge hoses. This merging of functions reduces system complexity while maintaining battery-free operation.
Solution Approach 2:
The single hose system serves multiple functions: it acts as both the air supply channel and the air discharge channel at different time intervals. The valve mechanism enables the hose to switch between supplying atmospheric air to the hollow space and discharging used air to the environment, making the system more versatile and less complex.
2Reliability
If electric motors with rechargeable batteries are used, then the drive system provides reliable power, but the device requires extensive cleaning and sterilization procedures that pose infection risks
Solution Approach 1:
The patent describes a medical device with an integrated motor that is designed for single-use disposal. The entire device, including the housing, working piston, valve, and tool, can be discarded after one use, eliminating the need for cleaning and sterilization procedures. This disposable approach removes infection risks associated with reprocessing while maintaining reliable battery-free power supply.
3Power
If complex differential pressure motors with multiple components are used, then the motor can provide sufficient power for tissue debridement, but the manufacturing cost and structural complexity increase
Solution Approach 1:
The motor is divided into functional segments: a hollow space for pressure differential, a working piston for linear movement, and a valve for air flow control. This segmentation allows each component to perform its specific function efficiently while keeping the overall structure simple and manufacturable.
Solution Approach 2:
The motor operates through periodic cycles of air intake and exhaust controlled by the valve. The working piston moves back and forth in regular intervals, converting periodic pressure differentials into continuous linear motion. This periodic action provides sufficient power for tissue debridement while maintaining a simple cyclic operational mechanism.
4Device complexity
If a single hose system is used for air supply and discharge, then the system complexity is reduced, but the control of alternate pressure impacts on working pistons becomes more challenging
Solution Approach 1:
The valve mechanism automatically controls the air flow direction based on the position and movement of the working piston. As the piston moves, it naturally triggers the valve to switch between connecting the hollow space to the atmosphere and to the discharge opening. This self-regulating mechanism simplifies pressure control without requiring external intervention or complex control systems.
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 motor provides reliable, low-cost, and hygienic operation for medical tools like saws, rasps, and brushes, reducing infection risks and environmental impact by being disposable and sterilizable, while achieving sufficient power for effective tissue debridement without extensive cleaning or battery reliance.
Implementation Method 1
an alternate impact of a first pressure and a second pressure on the working surfaces of the working pistons is controllable... such that a periodic movement of the working pistons and the rod is created
Implementation Method 2
the valve piston is able to be driven through thrusts of the working pistons against the valve piston
Data Source
AI summary
A differential pressure motor comprising two working pistons and a rod that move in a hollow space. Walls defining the hollow space have five openings. A valve piston moves between and against the working pistons and can be driven by the working pistons. The valve piston with the five openings forms a valve with which an alternate impact of a first pressure and a second pressure on the working pistons is controllable when the pressures are applied to three of the five openings such that the working pistons periodically move which drives a periodic movement of the valve piston. Also disclosed are a surgical drive system with, a medical lavage system for the debridement of soft tissue and/or bone tissue having, and a medical device for brushing, rasping or sawing soft tissue and/or bone tissue with such a differential pressure motor, and a method for operating a differential pressure motor.