Abstract
We studied stress relaxation of the infusion tube with a pressure sensor using FEA method. The stress distribution in the tube, the contact pressure on the wall of the pressure sensor, the decay of the reaction force on the wall of the pressure sensor were determined, respectively. Due to the stress relaxation of the infusion tube, the reaction force generated by the tube deformation was decreased by over 75% as compared with the original reaction force in the first several seconds after the infusion tube was set into the pressure sensor.
Highlights
An infusion pump is a medical device for delivering fluids into a patient’s body in a controlled manner
Stress relaxation is the decrease in stress in response to the same amount of strain generated in the structure
After 10,000 seconds, the reaction force is decreased by more than 75% as compared with the stress intense at the start
Summary
An infusion pump is a medical device for delivering fluids into a patient’s body in a controlled manner. A "down pressure" sensor will detect when the patient's vein is blocked, or the line to the patient is kinked. This may be configurable for subcutaneous or venous applications. The alarm will not be activated if the pressure caused by an occlusion does not reach the preset threshold. In this case, the pump cannot function normally, and it will display erroneous values of the infusion rate and accumulated volume. The pump cannot function normally, and it will display erroneous values of the infusion rate and accumulated volume These incorrect readouts could lead to catastrophic tissue or organ injuries in the patient. Maintaining catheter patency and minimizing occlusions is important for enhancing patient safety and improve therapeutic outcomes
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