Design of occlusion pressure testing system for infusion pump

Peng Zhang,Chuan-Yi Yu,Shu-Yi Wang,Min-Yan Zhang

doi:10.4236/jbise.2009.26062

Peng Zhang, Chuan-Yi Yu + Show 2 more

Open Access

https://doi.org/10.4236/jbise.2009.26062

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Abstract

Reliability of medical devices such as infusion pumps is extremely important because these devices are being used in patients who are in critical condition. Occlusion pressure, as an important parameter of infusion pumps, should be detected when an occlusion occurred. How-ever, infusion pumps’ occlusion pressure could not be tested and the performance of these pumps is not known to us. In order to test the occlusion pressure of infusion pump, a testing system has been put forward according to standards of IEC 60601-2-24:1998/ GB 9706.27- 2005. The system is comprised of sensor, acquisition card, three-way tap and so on; this system is controlled by a PC. At the same time, sampling rate could be changed if necessary and test time could be recorded. And then the characteristics of this system were studied, such as linear, effects of pump rates and different pumps. The system remained linear in a given environment. The higher is the pump rate, the faster is the time to reach occlusion condi-tion. The testing system has been proved to be effective in testing the occlusion pressure of infusion pumps and the accuracy error of pressure is content the demand of ±1% of range.

Highlights

Infusion pumps have been widely used in clinical practice, such as in intravenous infusion therapy to infuse fluids, medication or nutrients into patient’s circulatory system and can produce quite high but controlled pressure so as to inject controlled amount of fluids, pressure values are different regarding to different pumps.Nowadays, most infusion pumps have an occlusion pressure preset threshold, once the pressure of tubing, connecting to patients, exceeds the preset limit, the alarm of occurring occlusion will be active
We have found that, if fluid speed is low in syringe pumps, in the curve of timepressure, there exists and smooth phase liking a part of round and pressure values should be the in this phase
The different occlusion pressures between infusions pumps could be seen from the test results

Summary

Introduction

Infusion pumps have been widely used in clinical practice, such as in intravenous infusion therapy to infuse fluids, medication or nutrients into patient’s circulatory system and can produce quite high but controlled pressure so as to inject controlled amount of fluids, pressure values are different regarding to different pumps.Nowadays, most infusion pumps have an occlusion pressure preset threshold, once the pressure of tubing, connecting to patients, exceeds the preset limit, the alarm of occurring occlusion will be active. When an occlusion occurs along the delivery path, medication will not be delivered to patient but the pressure does not reach the preset pressure and the alarm will not be active. In this case, the pump can continue to operate normally, but it can display erroneous values about the infusion rate and accumulated volume. The pump can continue to operate normally, but it can display erroneous values about the infusion rate and accumulated volume This incorrect record for the patient could lead to an improper analysis, which will cause injury to patient. Infusion pumps must be periodically tested to determine whether they are functioning properly [3,4]

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