公开(公告)号：US5052401A

公开(公告)日：1991-10-01

申请号：US327047

申请日：1989-03-22

申请人： Gary W. Sherwin

发明人： Gary W. Sherwin

IPC分类号： A61B3/02 ,  A61B5/0484 ,  A61B5/0496

CPC分类号： A61B3/0325 ,  A61B3/02 ,  A61B5/0484 ,  A61B5/0496

摘要： An automated visual testing system is disclosed which presents an alternating steady state visual stimulus to a patient through an optical system that modifies the stimulus image. As the image changes, the patient produces evoked potentials that change. The evoked potentials are detected by a product detector which produces the amplitude of the evoked potentials. The product detector includes filters which isolate the patient's evoked potentials, a modulator which detects the response using the stimulus source frequency and a demodulator that determines the amplitude of the response. The product detector detects the level of the steady state evoked potential signals even in the presence of substantial background noise and extraneous electroencephalograhic signals. These detectors can be used to monitor the evoked potential produced by visual, aural or somatic steady state stimuli. The components described above can be used to produce a system that can determine to which of several different displays an observer is paying attention by providing images that blink at different frequencies and product detectors for each of the stimulus frequencies. The product detector producing the highest output indicates the display upon which the observer is focused.

摘要翻译： 公开了一种自动视觉测试系统，其通过修改刺激图像的光学系统向患者呈现交替的稳态视觉刺激。 随着图像的变化，患者产生变化的诱发电位。 诱发电位由产生检测器的产生检测电位的振幅。 产品检测器包括隔离患者诱发电位的滤波器，使用刺激源频率检测响应的调制器和确定响应振幅的解调器。 即使在存在大量背景噪声和外部脑电信号的情况下，产品检测器也能检测稳态诱发电位信号的电平。 这些检测器可用于监测由视觉，听觉或体细胞稳态刺激产生的诱发电位。 上述组件可以用于产生一种系统，该系统可以通过提供在不同频率闪烁的图像和针对每个刺激频率的产品检测器来确定观察者注意的几个不同显示中的哪一个。 产生最高输出的产品检测器指示观察者聚焦的显示。

公开(公告)号：US4631466A

公开(公告)日：1986-12-23

申请号：US727156

申请日：1985-04-25

申请人： Gary W. Sherwin

发明人： Gary W. Sherwin

IPC分类号： H02P8/14 ,  A61B3/103 ,  G02B26/04 ,  H02P8/00

CPC分类号： G02B26/04 ,  A61B3/103

摘要： A phase locked loop stepper motor controlled light chopper for providing a specific pattern reversal rate. The stepper motor controlled light chopper includes a phase comparator for comparing the phase of a reference signal to the phase of a comparison signal; a RC low pass filter for filtering the output of the phase comparator; a voltage controlled oscillator having a frequency varying in response to the output of the RC filter. The chopper also includes a binary counter for generating count signals responsive to the frequency of the voltage controlled oscillator; a divide by 10 circuit counting one of the outputs of the binary counter and providing the comparison signal. The light chopper also includes a memory circuit for storing an eight state four bit gray code for driving a four phase stepper motor as a chopper wheel in a specified pattern mounted on a drive shaft.

摘要翻译： 一种锁相环步进电机控制的光斩波器，用于提供特定的模式反转速率。 步进电动机控制的光斩波器包括：相位比较器，用于将参考信号的相位与比较信号的相位进行比较; 用于对相位比较器的输出进行滤波的RC低通滤波器; 具有响应于RC滤波器的输出而变化的频率的压控振荡器。 斩波器还包括用于产生响应于压控振荡器的频率的计数信号的二进制计数器; 对二进制计数器的输出之一进行10个电路的除法并提供比较信号。 光斩波器还包括存储电路，用于存储用于以安装在驱动轴上的指定图案中驱动作为斩波轮的四相步进电动机的八状态四位灰度代码。

公开(公告)号：US4883063A

公开(公告)日：1989-11-28

申请号：US338374

申请日：1989-04-13

申请人： Thomas E. Bernard ,  Gary W. Sherwin ,  William L. Kenney, Jr. ,  Debra A. Lewis

发明人： Thomas E. Bernard ,  Gary W. Sherwin ,  William L. Kenney, Jr. ,  Debra A. Lewis

IPC分类号： A61B5/0205 ,  A61B5/024

CPC分类号： A61B5/6831 ,  A61B5/02055 ,  A61B5/02438 ,  A61B5/7405

摘要： A personal monitor (10, 100, 200) for work and heat stress has a heart beat sensor (12) producing output electrical signals indicating a user's heart beats. A memory (127) stores heart beat information corresponding to the heart beat signals produced over predetermined time intervals. A microprocess (126) is connected to receive the heart beat information from the memory (127). The microprocessor (126) analyzes the heart beat information incrementally over the predetermined time intervals under program control to obtain a physiological demand during the predetermined time intervals and compares the obtained physiological demand against a stored physiological demand limit. Light emitting diodes (208) and a sound producing diaphragm (186) provide indications to the user when the stored physiological demand limit has been exceeded. The microprocessor (126) controls operation of the LEDs (208) and the diaphragm (186).

摘要翻译： 用于工作和热应激的个人监视器（10,100,200）具有心跳传感器（12），产生指示用户心跳的输出电信号。 存储器（127）存储与预定时间间隔产生的心跳信号相对应的心跳信息。 连接微处理器（126）以从存储器（127）接收心跳信息。 微处理器（126）在程序控制下在预定时间间隔上递增地分析心跳信息，以在预定时间间隔内获得生理需求，并将获得的生理需求与存储的生理需求限制进行比较。 发光二极管（208）和声音产生光圈（186）在超过存储的生理需求极限时向用户提供指示。 微处理器（126）控制LED（208）和隔膜（186）的操作。

公开(公告)号：US4697598A

公开(公告)日：1987-10-06

申请号：US727032

申请日：1985-04-25

申请人： Thomas E. Bernard ,  Emile M Roth ,  Edwin R. Mohan ,  Gary W. Sherwin ,  John M. Zomp

发明人： Thomas E. Bernard ,  Emile M Roth ,  Edwin R. Mohan ,  Gary W. Sherwin ,  John M. Zomp

IPC分类号： A61B3/028 ,  A61B3/10 ,  A61B3/103 ,  A61B5/04 ,  A61B5/0408 ,  A61B5/0476 ,  A61B5/0484

CPC分类号： A61B5/6814 ,  A61B3/103 ,  A61B5/04085 ,  A61B5/0476 ,  A61B5/0484 ,  A61B2562/222

摘要： An evoked potential autorefractometry system includes a computer driving an alternating checkerboard mirror stimulus to project a stimulus pattern directly to a patient through a continuously variable focus lens controlled by the computer and which maintains a constant image size on the patient's retina. The evoked potentials produced by the patient are amplified, asychronously filtered both in an analog and digital fashion to allow peak to peak detection of the evoked potentials to determine amplitude. The digital filter includes a 255 point running sum. The peak to peak amplitudes are asychronously digitally filtered using a 16 point running sum to produce an amplitude measure of the evoked potentials. The lens is swept rapidly from one extreme of focus to the other extreme in relatively large steps to determine the area in which the peak amplitude occurs. The lens is then subsequently swept in smaller and smaller range sweeps using smaller and smaller steps around the peak amplitude until the peak in the amplitude is pinpointed within a desired diopter at which point the lens position is printed out on the printer as the patient's prescription.

摘要翻译： 诱发电位自动折射测量系统包括驱动交替棋盘反射镜激励的计算机，以通过由计算机控制的连续可变焦距透镜将刺激图案直接投射到患者，并且在患者的视网膜上维持恒定的图像尺寸。 由患者产生的诱发电位被放大，以模拟和数字方式同步滤波，以允许峰值到峰值检测诱发电位以确定振幅。 数字滤波器包括255点运行总和。 峰峰值幅度使用16点运行和进行异步数字滤波，以产生诱发电位的幅度测量。 在相对大的步骤中，透镜从焦点的一个极端到另一个极端快速扫描，以确定出现峰值振幅的区域。 然后随后使用围绕峰值幅度的较小和较小的步长扫描镜头，直到在所需屈光度内精确确定振幅中的峰值，此时透镜位置将按照患者的处方方式打印在打印机上。

公开(公告)号：US4632120A

公开(公告)日：1986-12-30

申请号：US727033

申请日：1985-04-25

申请人： Gary W. Sherwin ,  Edwin R. Mohan

发明人： Gary W. Sherwin ,  Edwin R. Mohan

IPC分类号： A61B5/0408 ,  A61B5/0478 ,  A61B5/0492 ,  A61B5/04

CPC分类号： A61B5/0478

摘要： A self-preparing subkeratinous probe for electroencephalographic measurement includes a spring body which applies a penetrating force to a plow which parts hair and scrapes through a dead keratinous layer of skin to a bloodrich epidermis layer while the probe is being positioned on the head without causing bleeding. The plow includes tabs which form a gap for parting the hair and scraping the skin. The probe also includes an electrolyte tube which can be used to apply electrolyte solution to the skin and plow after it is positioned.

摘要翻译： 用于脑电图测量的自我准备的子角蛋白探针包括弹簧体，其将穿透力施加到犁，其将毛发部分并通过死皮肤角质层刮擦到富血表皮层，同时探针位于头部而不引起出血 。 犁包括形成用于分开头发和刮擦皮肤的间隙的突片。 探针还包括电解质管，其可用于将电解质溶液施用于皮肤并在其定位后进行犁。