Peristaltic Pump Blockage Detection Using Tube Displacement
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Solution Overview
Problem
Existing peristaltic pumps in hemodialysis systems face issues with blockage detection, as they require a separate pressure detecting unit, increasing manufacturing costs and causing blood stagnation, especially during blood removal and return processes.
Innovation Solution
A peristaltic pump with a mounting concave section and peristalsis section that includes displacement detecting means to identify blockages in the liquid flow route without the need for a new separate member, using a rotor and blockage detecting means to analyze the output waveform for amplitude and cycle changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate pressure detecting unit is connected to the liquid flow route to detect blockages, then blockage detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the pressure detection function with the existing peristaltic pump structure by using the peristaltically-actuated tube itself as the sensing element. The displacement detecting means is integrated into the pump body to detect tube displacement, eliminating the need for a separate pressure detecting unit connected to the liquid flow route.
Solution Approach 2:
The peristaltically-actuated tube serves dual purposes: it both transports the liquid and acts as the sensing element for pressure/blockage detection. The tube's own displacement in response to pressure changes provides the detection signal, allowing the system to self-diagnose blockages without external sensing components.
2Measurement precision
If a separate pressure detecting unit is connected to the liquid flow route, then blockage detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the pressure detection function with the existing peristaltic pump structure by using the peristaltically-actuated tube itself as the sensing element. The displacement detecting means is integrated into the pump body to detect tube displacement, eliminating the need for a separate pressure detecting unit connected to the liquid flow route.
Solution Approach 2:
The peristaltically-actuated tube serves dual purposes: it both transports the liquid and acts as the sensing element for pressure/blockage detection. The tube's own displacement in response to pressure changes provides the detection signal, allowing the system to self-diagnose blockages without external sensing components.
3Measurement precision
If a separate pressure detecting unit is connected to the liquid flow route, then blockage detection capability is improved, but blood stagnation occurs
Solution Approach 1:
The peristaltically-actuated tube serves dual purposes: it both transports the liquid and acts as the sensing element for pressure/blockage detection. The tube's own displacement in response to pressure changes provides the detection signal, allowing the system to self-diagnose blockages without external sensing components.
Solution Approach 2:
The patent extracts the detection function from a separate physical component and embeds it into the existing tube-pump interaction mechanism. By detecting tube displacement during normal peristalsis, the system obtains pressure information without introducing additional components that could create stagnation points in the liquid flow route.
4Device complexity
If displacement detecting means is integrated into the peristaltic pump to detect tube displacement, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The displacement detecting means provides real-time feedback on tube displacement during the peristalsis cycle. The control unit analyzes this feedback signal to determine if blockages are present, maintaining measurement precision through continuous monitoring and signal processing of the tube's mechanical response to pressure changes.
Solution Approach 2:
The patent replaces complex mechanical pressure sensing mechanisms with a simpler displacement detection system. By measuring the tube's displacement during normal peristalsis and analyzing the signal characteristics, the system achieves blockage detection without requiring sophisticated mechanical pressure sensors.
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
This solution allows for accurate and efficient detection of blockages in the liquid flow route, reducing manufacturing costs and preventing blood stagnation, while enabling the detection of both negative and positive pressures during blood removal and return processes.
Implementation Method 1
a peristalsis section which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction such that a liquid therein is flowable
Data Source
Figure 1
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AI summary
[Object] To provide a peristaltic pump in which blockage of a liquid flow route can be detected without connecting a new separate member to the liquid flow route. [Solution] A peristaltic pump includes a mounting concave section 8a on which a peristaltically-actuated tube 1a connected to an arterial blood circuit 1 is mountable; a roller 10 which compresses the peristaltically-actuated tube 1a mounted on the mounting concave section 8a in a radial direction and causes the peristaltically-actuated tube 1a to be peristaltically actuated in a longitudinal direction such that a liquid therein is flowable in the arterial blood circuit 1; a load sensor 18 that is able to detect displacement of the peristaltically-actuated tube 1a mounted on the mounting concave section 8a in the radial direction; and blockage detecting means 19 that is able to detect a blockage of the arterial blood circuit 1 based on the displacement detected by the load sensor 18.