公开(公告)号：US5410297A

公开(公告)日：1995-04-25

申请号：US2929

申请日：1993-01-11

申请人： Peter Joseph ,  Peter Scharpf ,  Eric T. Heinze

发明人： Peter Joseph ,  Peter Scharpf ,  Eric T. Heinze

IPC分类号： A61B5/11 ,  G08B21/22 ,  G08B21/00

CPC分类号： A61B5/6892 ,  A61B5/1115 ,  G08B21/22 ,  A61B2562/0214

摘要： A capacitive sensor pad includes a foam plastic pad and heavy aluminum foil plates located to the opposite side thereof. The plates are adhesively bonded to the inner surfaces of an outer cover. The capacitor of the pad is connected in circuit with an oscillator and produces a frequency-related output. A ripple counter establishes a frequency-related output proportional to the capacitance. A microprocessor reads the counter output and a plurality of samples are averaged to establish a reference base and the true weight affect of the patient on the sensing pad. Other factors which might effect the signal are readily attended to by programmed compensation. Each subsequent sample is averaged and compared with the reference base. If within a permitted range, the latest and current signal is averaged with the reference base and establishes a new base, and continuously tracks changes in the sensing system. A selected change in a selected time delay system by requiring a series of alarm states or immediately if advance warning is desired, actuates an alert or alarm system, which requires positive resetting to terminate the alarm system. The system is positively reset to return to normal position monitoring. The system may be set to automatically reset the alarm system after an alarm condition is established and then removed by the continuous tracking of the patient movement.

摘要翻译： 电容传感器垫包括位于其相对侧的泡沫塑料垫和重铝箔板。 板被粘合到外盖的内表面上。 焊盘的电容器与振荡器连接在一起，产生频率相关的输出。 纹波计数器建立与电容成比例的频率相关输出。 微处理器读取计数器输出并且平均多个样本以建立参考基准和患者在感测垫上的真实重量影响。 可能会影响信号的其他因素通过程序化补偿容易受到关注。 将每个后续样品平均并与参考基准进行比较。 如果在允许的范围内，最新和当前的信号与参考基准平均，并建立一个新的基地，并连续跟踪传感系统的变化。 选择的延时系统通过要求一系列报警状态或立即如果需要提前警告而选择的时间延迟系统进行选择的更改，则启动警报或报警系统，这需要正向复位以终止报警系统。 系统正确复位，恢复正常位置监控。 可以设置系统在报警条件建立后自动复位报警系统，然后通过对病人运动的连续跟踪消除。