Syringe Pump Occlusion Relief via Reverse Motor Rotation
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Solution Overview
Problem
Syringe pumps face challenges in safely delivering drugs as tube occlusions can lead to abrupt drug flow when straightened, posing safety risks during drug administration.
Innovation Solution
Incorporating a pressure sensor and control unit in the syringe pump to detect occlusions and initiate counterclockwise motor rotation when occlusion pressure exceeds a threshold, with predetermined conditions for stopping this rotation to prevent sudden drug flow, including pressure thresholds and rotation steps, ensuring safe drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tube occlusion is detected and the motor is stopped, then the safety of drug delivery is improved, but the drug delivery is interrupted
Solution Approach 1:
The system performs preliminary action by rotating the motor in the reverse direction when occlusion is detected, creating negative pressure to evacuate drug from the tube before stopping delivery. This prevents abrupt drug flow when the tube is later straightened, ensuring safety before resuming normal operation.
Solution Approach 2:
The system converts the harmful effect of tube occlusion into a beneficial safety mechanism. When occlusion is detected, the reverse motor rotation creates negative pressure that actively evacuates drug from the tube, transforming the occlusion event into an opportunity to prevent potential abrupt drug flow and ensure patient safety.
2Reliability
If the motor rotates counterclockwise to relieve occlusion, then the tube occlusion is mitigated, but the drug may be abruptly pushed into the patient
Solution Approach 1:
The system applies the opposite action by rotating the motor in the reverse direction instead of the normal forward direction. This reverse rotation creates negative pressure to evacuate drug from the tube, preventing the harmful effect of abrupt drug flow that would occur if the tube were straightened while drug was being pushed forward.
Solution Approach 2:
The system performs preliminary anti-action by rotating the motor in reverse when occlusion is detected, creating negative pressure to counteract the potential harmful effect. This preliminary reverse action evacuates drug from the tube before the tube can be straightened, preventing abrupt drug flow to the patient.
3Measurement precision
If the pressure sensor detects occlusion and triggers motor reversal, then the occlusion state is detected, but the system complexity increases
Solution Approach 1:
The system uses feedback from the pressure sensor to detect tube occlusion and automatically triggers the motor to rotate in reverse. This closed-loop feedback mechanism provides accurate occlusion detection and automatically initiates the safety response, managing system complexity through automated control rather than manual intervention.
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 solution effectively discontinues drug delivery while preventing abrupt flow when occlusions are relieved, enhancing operational safety by using a step motor and notification units for confirmation.
Implementation Method 1
a pressure sensor that detects pressure while pressing the syringe plunger, in order to detect that the tube is in an occluded state
Data Source
Figure 1
Figure 2
Figure 3(A)~3(C)
AI summary
[Problem] Provided is a syringe pump which can discontinue delivery of a drug while preventing the drug from abruptly flowing inside a tube if an occlusion state of the tube is cancelled by straightening bending or twisting of the tube, and thus, the safety of an operation of delivering a drug can be enhanced. [Means for Resolution] A syringe pump 1 includes a drive motor 133; a syringe plunger pressuring member 10 that grasps a syringe plunger 202 of a syringe 200 and presses the syringe plunger 202 in accordance with a clockwise rotation operation of the drive motor 133 so as to deliver a drug inside the syringe 200 to a patient P; a pressure sensor 900 that detects pressure while pressing the syringe plunger 202, in order to detect that a tube 203 is in an occlusion state; and a control unit 100 that performs a counterclockwise rotation operation of the drive motor 133 when pressure detected by the pressure sensor 900 exceeds a predetermined occlusion judgment standard value LC, and stops the counterclockwise rotation operation of the drive motor 133 if any one of the predetermined conditions is fulfilled.