Electromechanical Pump Controller for Stable Negative Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing negative-pressure therapy systems lack efficient control mechanisms for maintaining optimal pressure levels during treatment, leading to suboptimal wound healing outcomes.
Innovation Solution
A therapy system incorporating a controller, actuator unit, and pump unit with sensors to monitor and adjust negative pressure dynamically, using a DC motor and bellows mechanism to maintain target pressure through controlled expansion and contraction, and a programmable circuit board for precise pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a reciprocating vacuum pump is used to generate negative pressure, then the pump can create sufficient suction force for wound therapy, but the pump cannot maintain constant pressure and requires complex control mechanisms
Solution Approach 1:
The patent implements a feedback control system where a pressure sensor continuously monitors the negative pressure level, and a microprocessor adjusts the pump operation based on the difference between actual and target pressure. This closed-loop feedback enables the reciprocating pump to maintain constant pressure despite its inherent inability to hold pressure statically, resolving the contradiction between generating sufficient suction force and maintaining constant pressure control.
Solution Approach 2:
The patent replaces purely mechanical pressure control mechanisms with an electronic control system. Instead of using mechanical valves or dampers that are difficult to control precisely, the system uses a microprocessor to control the pump's on/off timing and duration, substituting mechanical complexity with electronic precision for pressure regulation.
2Ease of operation
If a manually operated pump is used for negative pressure wound therapy, then the device can be portable and cost-effective, but the pump cannot maintain optimal pressure levels consistently
Solution Approach 1:
The patent implements self-service automation where the pump system automatically regulates its own operation. The pressure sensor continuously monitors the pressure level, and the microprocessor autonomously adjusts the pump cycling based on the pressure differential, eliminating the need for manual operation while maintaining optimal pressure consistency. This transforms the manually operated device into an autonomous system that self-regulates pressure without requiring user intervention.
Solution Approach 2:
The feedback control mechanism automatically adjusts pump operation based on real-time pressure measurements. The microprocessor compares actual pressure with the target pressure level and modulates pump cycling accordingly, ensuring consistent optimal pressure maintenance without manual control, thus improving reliability while preserving portability.
3Measurement precision
If continuous monitoring of pressure is implemented, then optimal wound healing can be achieved, but the system requires additional sensors and control circuitry
Solution Approach 1:
The patent uses a single pressure sensor in a feedback loop to achieve continuous accurate pressure monitoring. The microprocessor processes the sensor signal and automatically adjusts pump operation based on the pressure differential, eliminating the need for multiple sensors or complex control circuitry. This feedback approach achieves high measurement precision while minimizing system complexity by using one sensor to control the entire pressure regulation process.
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
Enhances wound healing by maintaining consistent negative pressure, promoting tissue growth and fluid removal, thereby improving treatment efficacy.
Implementation Method 1
A source of negative pressure may be beneficial in treating a wound or other tissue defect. The negative pressure may be applied through a dressing placed over the wound or other tissue defect
Implementation Method 2
fluid movement through the dressing is driven by a pressure gradient between the wound site and the negative pressure source
Implementation Method 3
A pump unit configured to compress the bellows to a compressed state, thereby generating a source of negative pressure
Implementation Method 4
A controller configured to: monitor a pressure level of the negative pressure source; and adjust operation of the pump unit based on the monitored pressure level
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus for negative-pressure treatment may include an enclosure having a variable volume compressible to a minimum volume, a port and an actuation surface. The apparatus may include a first one-way valve configured to allow fluid ingress to the enclosure, a second one-way valve configured to allow fluid egress from the enclosure, and an actuator configured to apply a compressive force to the actuation surface. The apparatus may further comprise a motor coupled to the actuator to apply and remove the compression force and having an operating parameter indicative of the variable volume. The apparatus may further comprise a controller coupled to the motor and configured to turn on the motor to engage the actuator to alternately apply and remove the compressive force until the enclosure is compressed to the minimum volume and turn off the motor in response to the operating parameter indicating that the chamber is compressed to the minimum volume.