Negative-Pressure Piston Engine for Constant-Frequency Surgical Drive
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Solution Overview
Problem
Existing medical devices used in septic revisions face challenges with weight and cost due to electric motors, and compressed air systems pose contamination risks, leading to inefficient and costly operations.
Innovation Solution
A negative pressure-driven engine with a piston-cylinder system and valve system, featuring a control system with a second piston-cylinder system to maintain consistent operation and minimize costs, utilizing plastic materials for lightweight and cost-effective construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electric motor is used to operate the medical device, then the device can be operated reliably, but the weight of the medical device increases significantly
Solution Approach 1:
The patent replaces the electric motor (electromechanical system) with a pneumatic engine driven by negative pressure. The engine comprises a piston-cylinder arrangement where negative pressure alternately applied to different sides of the piston generates reciprocating motion, which is then converted to rotary motion via a crank mechanism. This substitution eliminates the need for heavy electric motors while maintaining operational reliability through the pneumatic drive system.
Solution Approach 2:
The patent employs a pneumatic engine that utilizes negative pressure (vacuum) as the driving force. The engine includes a piston divided into two chambers, where negative pressure is alternately applied to each chamber to create reciprocating piston motion. This pneumatic mechanism replaces the electric motor and significantly reduces device weight while providing sufficient power for bone cutting operations.
2Adaptability or versatility
If an electric motor is used, then the device can be operated, but the acquisition costs and operating costs increase
Solution Approach 1:
The patent enables the medical device to be constructed as a single-use disposable unit by eliminating the expensive electric motor and its associated power supply systems. The pneumatic engine, being simpler in construction and lower in cost, allows the entire medical device to be economically disposed of after one use, eliminating sterilization costs and enabling single-use operation.
Solution Approach 2:
The patent extracts and removes the expensive electric motor component from the medical device system. By replacing it with a simpler pneumatic engine that uses readily available negative pressure from the operating room vacuum system, the patent eliminates the need for batteries, power supplies, and complex electrical systems, thereby significantly reducing both acquisition and operating costs.
3Ease of operation
If compressed air is used to operate the engine, then the engine can be operated, but contamination risks increase
Solution Approach 1:
The patent inverts the conventional approach of using positive pressure (compressed air) by utilizing negative pressure (vacuum) to drive the engine. Since the operating room vacuum system already provides sterile negative pressure for surgical suction, this inversion allows the engine to be powered by a readily available, sterile gas source without introducing contamination risks associated with external compressed air systems.
4Device complexity
If the working piston deflection controls the valve switching, then the system is simple, but insufficient deflection leads to jamming risks
Solution Approach 1:
The patent introduces a separate control piston as an intermediary mechanism that independently controls the valve switching. The control piston is actuated by negative pressure applied to its chambers and, through a connecting rod, operates the valve element. This decouples the valve control from the working piston deflection, ensuring reliable switching regardless of the working piston's stroke length or workload conditions, thereby eliminating jamming risks.
Solution Approach 2:
The patent segments the engine into two independent piston systems: the working piston that performs the cutting function and the control piston that manages valve switching. This segmentation allows each piston to operate independently with optimized stroke lengths and pressures, ensuring that valve switching is not dependent on the working piston's deflection and preventing jamming even under varying workload conditions.
5Device complexity
If the working piston deflection controls the valve switching, then the system is simple, but the working frequency varies with workload
Solution Approach 1:
The control piston acts as an intermediary that decouples valve switching frequency from working piston deflection. The control piston can be actuated at a consistent frequency by regulated negative pressure application, ensuring stable working frequency regardless of workload variations. This intermediary mechanism allows the valve switching to proceed at a predetermined rhythm independent of the working piston's operational demands.
Solution Approach 2:
The patent introduces dynamic control through the control piston system that can independently adjust its operation. The control piston's motion is regulated by the application of negative pressure to its chambers, allowing the system to maintain consistent switching frequency under varying workload conditions. This dynamic control mechanism ensures stable productivity regardless of the working piston's deflection characteristics.
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 engine operates reliably and safely under varying workloads with constant frequency, reducing costs and enabling single-use medical devices, while avoiding contamination risks associated with compressed air systems.
Implementation Method 1
a negative pressure source (500), wherein the control system is connected to the valve system in a gas conducting manner, wherein the first control cylinder portion (471) or the second control cylinder portion (472) can be connected to the negative pressure source (500)
Data Source
AI summary
One aspect relates to an engine including a working system, having a first piston-cylinder system, comprising a working piston and a working cylinder. The working piston divides the working cylinder into a first working cylinder portion and a second working cylinder portion, a valve system, having a first valve connection and a valve element. The valve system and the working system are connected in a gas conducting manner, the first valve connection can be connected to a negative pressure source, and the valve element is movably arranged in the valve system such that, in a first valve position, the valve element connects the first valve connection to the first working cylinder portion, and, in a second valve position, connects the first valve connection to the second working cylinder portion in a gas conducting manner.