Mukherjee Biswarup, George Boby, Sivaprakasam Mohanasankar
Annu Int Conf IEEE Eng Med Biol Soc. 2013;2013:4734-7. doi: 10.1109/EMBC.2013.6610605.
Injection of fluids in the body using needle syringes is a standard clinical practice. The rate of injection can have various pathological effects on the body such as the pain perceived or in case of anesthesia, the amount of akinesia attained. Hence, a training system with a modified syringe employing a simple measurement scheme where a trainee can observe and practice the rate of injection prior to administering on actual human subjects, can be of great value towards reduction of complications in real life situations. In this paper, we develop a system for measurement of syringe injection rate with two Hall-effect sensors. Ring magnets attached to the body of the syringe along with the dual Hall-effect sensor configuration help in determining the position of the piston with respect to the syringe body. The two Hall-sensors are arranged in a differential configuration such that a linear relationship is obtained between the volume of liquid in the syringe (in ml) and the Hall-effect sensor output voltages. A prototype developed validated the measurement scheme. The rate of injection was displayed in real-time with a LabVIEW based Virtual Instrument. The error was within acceptable limits illustrating its efficacy for practical training purposes.
使用针筒注射器向体内注射液体是一种标准的临床操作。注射速度会对身体产生各种病理影响，比如感觉到的疼痛，或者在麻醉情况下，达到的运动不能量。因此，一种采用改良注射器的训练系统，该系统采用简单的测量方案，使受训者能够在对实际人体进行注射之前观察和练习注射速度，对于减少现实生活中的并发症可能具有很大价值。在本文中，我们开发了一种使用两个霍尔效应传感器测量注射器注射速度的系统。附着在注射器主体上的环形磁铁以及双霍尔效应传感器配置有助于确定活塞相对于注射器主体的位置。两个霍尔传感器采用差分配置，以便在注射器中的液体体积（以毫升为单位）与霍尔效应传感器输出电压之间获得线性关系。开发的原型验证了该测量方案。使用基于LabVIEW的虚拟仪器实时显示注射速度。误差在可接受范围内，说明了其用于实际训练目的的有效性。
