公开(公告)号：US3584618A

公开(公告)日：1971-06-15

申请号：US3584618D

申请日：1969-03-17

Applicant: BECKMAN INSTRUMENTS INC

Inventor： REINHARD CLYDE J ,  JUSTUS GORDON R ,  KEARNS KENNETH L

IPC: A61B5/08 ,  A61B5/05

CPC classification number: A61B5/0809 ,  A61B5/7405 ,  C10M2201/062 ,  C10M2205/024 ,  C10M2205/026

Abstract: An alarm circuit for a respiration monitoring system which, in response to electrical signals indicative of the occurrence of a breath, determines whether the time interval between successive breaths exceeds a first preset time interval. When this occurs, a warning indicator is activated and the circuit begins monitoring the respiration rate. If the rate during a second preset time interval is less than a first preset rate, a low rate indicator is activated and the circuit determines whether the respiration rate during the second time interval and a third preset time interval is less than a second preset rate which is greater than the first preset rate. If the rate exceeds the second preset rate, the warning and low rate indicators are deactivated. If the rate is less than the second preset rate, an apnea indicator is activated.

公开(公告)号：US3656065A

公开(公告)日：1972-04-11

申请号：US3656065D

申请日：1970-06-12

Applicant: BECKMAN INSTRUMENTS INC

Inventor： REINHARD CLYDE J ,  MILLER DONALD D

IPC: H03F3/393 ,  H03F3/38

CPC classification number: H03F3/393

Abstract: A floating differential input amplifier is connected through a first field-effect transistor gate to an input winding of a signal transformer. An oscillator is connected to a primary winding of a power isolation transformer which transformer has one secondary winding connected to a rectifier circuit which in turn is connected to supply bias power to the differential amplifier. Another secondary winding of the power isolation transformer is connected to operate the first field-effect transistor gate. The output winding of the signal transformer is connected through a second field-effect transistor gate in series with a coupling capacitor to the input of a potentiometric operational amplifier. The potentiometric operational amplifier is connected to a filter amplifier and an overload detection circuit. An integrating amplifier is connected between the output of the filter amplifier and the input of the potentiometric operational amplifier to provide DC base line correction. The overload detection circuit is connected to operate a field-effect transistor switch connected to the input of the potentiometric operational amplifier and through which the input coupling capacitor can be rapidly charged. A common-mode driver amplifier has one input connected through a resistance network to the inputs of the floating differential amplifier and the other input connected to the common ground of the output circuitry. The output of the common mode driver is connected to an electrostatic cable shield surrounding the input leads connected to the differential amplifier inputs.

Abstract translation: 浮动差分输入放大器通过第一场效应晶体管栅极连接到信号变压器的输入绕组。 振荡器连接到电力隔离变压器的初级绕组，该变压器具有连接到整流电路的一个次级绕组，该整流电路又连接到差分放大器的电源偏置电源。 电源隔离变压器的另一个次级绕组被连接以操作第一场效应晶体管栅极。 信号变压器的输出绕组通过与耦合电容器串联的第二场效应晶体管栅极连接到电位计运算放大器的输入端。 电位计运算放大器连接到滤波放大器和过载检测电路。 一个积分放大器连接在滤波放大器的输出端和电位运算放大器的输入端之间，以提供直流基线校正。 过载检测电路被连接以操作连接到电位计运算放大器的输入的场效应晶体管开关，并且输入耦合电容可以通过该电容快速充电。 共模驱动放大器通过电阻网络将一个输入端连接到浮动差分放大器的输入端，另一个输入端连接到输出电路的公共地。 共模驱动器的输出连接到围​​绕连接到差分放大器输入的输入引线的静电电缆屏蔽。