Abstract: An extracorporeal blood circulation system including a line for withdrawing the venous blood from the patient, an artificial lung provided on the line, a reservoir for the blood withdrawn, a blood supply line for sending out the blood from the reservoir to the artery of the patient, and a blood supply pump provided on the blood supply line and serving as an artificial heart. The amount of blood to be supplied is automatically controlled to maintain the arterial pressure of the patient in a suitable required range. The blood supply pump is stopped when the arterial pressure of the patient measured is above a predetermined upper limit value, while the pump is driven when the arterial pressure has lowered to a level below a lower limit value. The amount of blood to be withdrawn is also controlled automatically to keep the central venous pressure of the patient approximately constant. The blood withdrawing line has a blood withdrawing pump.

Abstract: A catheter for intravascular occlusion of vascular connections and other defects provided with a tubular element and carrying at its very end a position-balloon behind which is provided the occlusion-balloon; the latter is detachable from the catheter and the position-balloon is either attached to the catheter or to the occlusion balloon to be detached therewith.

Abstract: A medical-electronic body fluid accounting system for use in surgical procedures and in post-operative and non-surgical care to afford a running account of the fluid intake to a patient and fluid outtake therefrom. The system is provided with a microcomputer to which is applied digital data derived from a plurality of fluid input source channels and fluid output source channels which together represent the prevailing fluid input and output sources associated with the patient. Included in the input source channels are those monitoring the flow of fluids being fed intraveneously into the patient, each such input channel having a sensor which generates a signal representing the volume of a particular fluid, such as a saline solution, being infused into the patient, this signal being converted into a corresponding digital value.

Abstract: An improved occulsion detection apparatus and method for use in a pumping apparatus wherein a motor control sequencer provides signals adapted to rotate the shaft of a motor and a pump mechanism through a pumping cycle. The motor is advantageouly initially operated at a first higher torque to insure proper starting of the pumping cycle and is subsequently operated at a second lower torque through the remainder of the pumping cycle, the motor stalling if an occlusion within a fluid delivery system causes the back pressure within the delivery system to exceed the torque capabilities of the motor. An occulsion detector times the pumping cycle and if the cycle exceeds a first predetermined time period, an occulsion alarm is generated. The occlusion detector may further cause the motor control sequencer to increase motor torque to attempt to complete the pumping cycle or may de-energize the motor after a second predetermined period to prevent damage to the pumping apparatus.

Abstract: Microbubbles are formed in a liquid, e.g., blood in order to alter the transmission characteristics thereof to electromagnetic and sonic waves transmitted therethrough, by dissolving therein a solid particulate material, preferably as a suspension in a carrier liquid in which the particulate material is at least temporarily stable, the particles of which are substantially free of microbubbles and have a plurality of gas-filled voids communicating with the surface of the particles and providing nuclei for microbubble formation and the ratio of the mass of the particles to the volume of gas in the voids is sufficient to render the liquid in which the particulate material is dissolved supersaturated with respect to the gas in the voids in the area of the liquid surrounding the microbubbles when they are formed.

Abstract: A hemostasis valve comprising a body having a central passage, a seal having a central aperature therein, the seal being mounted in the central passage, and a diaphragm having a wall member with a slit therein, the diaphragm being mounted in the central passage, the diaphragm wall member having an inner bottom diaphragm surface, and an outer bottom diaphragm surface, the slit extending from the inner bottom diaphragm surface to the outer bottom diaphragm surface, the wall member having a diaphragm chamber therewithin.

Abstract: The open end of a catheter is inserted in the blood vessel of a patient. The catheter is connected by hollow tubing to a physiologic pressure transducer. The tube is filled with an intermediate pressure-transmitting fluid such as a physiologic saline solution. An infusion device between the patient and the transducer constantly flushes the system with a slow flow of fluid. Blood pressure variations are transmitted through the fluid to the transducer, which converts the pressure to electronic information and transmits the information to a monitor for display. Between the infusion device and the transducer is a variable restrictor which damps the pressure waves in the fluid. This restrictor is used to tune the system to eliminate resonant waves, which distort the monitoring reading. In one form, the variable restrictor includes a valve having an orifice, the effective size of which is reduced or enlarged by compressing and releasing a deformable, flexible ring.

Abstract: A method for determining the speed of leukocytes in retinal capillaries comprises the steps of simulating, by means of a minicomputer system which includes a visual display, the motion of entoptically seen leukocytes in retinal capillaries; observing entoptically the motion of actual leukocytes in the retinal capillaries of the subject's own eye; and comparing the appearances and motions of the visual display and the actual leukocytes. Apparatus for performing such a method comprises a minicomputer, a graphic display, and a display--processor interface.

Abstract: An exemplary embodiment includes a television pickup installation, image storage circuitry, a difference stage for the subtraction of two chronologically successively obtained image data signals through difference formation and a monitor. An address computer is connected with the output of the difference stage and has outputs connected to the address inputs of the image storage circuitry. The computer alters in a step-wise fashion the allocation of the image point data to be compared in the difference stage (13) until a minimum of the difference formed during the subtraction of two images results.

Abstract: A multi-mode scanner head employing split (semicircular transducers) is described. In some modes such as simultaneous B-scan and M-scan each transducer moves independent of the other. For continuous Doppler mode the transducers move together. The relatively small, hand-held scanner head is particularly useful for cardiac examinations.

Abstract: Ultrasonic echo signals are successively sampled and converted to digital echo data which are written into a first digital memory column by column and then read out row by row into a first buffer memory. The digital echo data which are derived in response to beams successively transmitted in a predetermined direction are written into columns of a second digital memory and read out of the memory in rows into a second buffer memory. The data stored in the first and second buffer memories are read out for digital-to-analog conversion and selectively applied within a television "frame" interval to control electron beam intensity of a single cathode ray tube so as to present tomographic and cardiographic images in different display areas of the tube.

Abstract: A massaging apparatus comprises a pair of massaging wheels obliquely and eccentrically attached to a main shaft, a shifting mechanism for shifting the massaging wheels and main shaft in the direction of the length of a chair back rest or a bed, and a spacing changing mechanism for changing the spacing between the massaging wheels. The apparatus is designed to detect the position of the pair of massaging wheels and the spacing therebetween. It further comprises position selecting switches associated with the neck, shoulders, back and waist of the human body. When any one of these position selecting switches is operated, the shifting mechanism and the spacing changing mechanism as well as the rotative direction of the main shaft are automatically controlled in accordance with the detected shifted position and spacing of the massaging wheels.

Abstract: Ultrasound imaging systems such as those utilized in breast scanning and diagnosis require not only periodic maintenance but also evaluation of the resolution and depth of field capability so as to provide maximum information to the clinician utilizing the system. The resolution measuring device preferred incorporates helically contorted filaments physically arranged to intersect at a point thereby forming a known gradient of divergence. Measurement of the translational distance from the intersection point to the point of resolution of imaged lines will, with knowledge of the gradient, permit facile determination of the separation distance which corresponds to the resolution of the ultrasound imaging system.

Abstract: Body cavity fluids, such as ascitic fluid and pleural fluid, are concentrated and filtered to remove bacteria and cancer cells, and the filtered concentrate is returned to the patient intravenously. The concentration and filtration are performed batch-wise, with the concentration being done before the filtration. The apparatus for concentrating and filtering includes a first container for holding the body fluid, a second container for holding the final filtered concentrate, a filter, a concentrator, a pump and two branched tubes connected to the filter and the concentrator which tubes can be selectively closed for concentrating and filtering the body fluid. The fluid outlet of the first container is designed to help prevent precipitated fibrin from passing out of the container and blocking the concentrator or filter membranes.

Abstract: As disclosed herein, a new and improved method and apparatus provides for the ensonification of at least a portion of a body part with acoustic energy pulses; detects the polarity and amplitude of the resultant echo pulse; and displays the detected data in a color television format to result in an improvement in resolution in indicia of tissue character. This improvement is accomplished by a process which simultaneously detects both the amplitude or strength of the echo pulse and the polarity sense of the echo pulse at the peak amplitude for each echo pulse. The improvement utilizes a general property of acoustical pulses to detect polarity and amplitude of the echo pulse. The amplitude and polarity measures of the echo pulse are used to produce intensity (luminance) and color (chrominance) throughout the body part for each individual picture element (pixel) forming the picture.

Abstract: An improved apparatus and method for analyzing the chemical and structural composition of a specimen including whole-body specimens which may include, for example, living mammals, utilizing nuclear magnetic resonance (NMR) techniques. A magnetic field space necessary to obtain an NMR signal characteristic of the chemical structure of the specimen is focused to provide a resonance domain of selectable size, which may then be moved in a pattern with respect to the specimen to scan the specimen.

Abstract: The invention herein consists of apparatus and a method of monitoring livestock for artificial insemination purposes. A transmitter is fastened to the female animal to generate a signal which is received at a distant point and recorded for interpretation of the phase of the animal's fertility cycle. The transmitter includes time delay circuitry which causes the transmitter to pause for a predetermined time before signal generation. Switch means when closed activates the transmitting means and cut-off means within the transmitter terminates its activities after signal generation to conserve energy.In the preferred embodiment of the invention a magnetic switch is employed and a time delay circuit in the transmitter allows approximately 15 seconds to elapse before signal generation. The receiving unit of the preferred embodiment includes a standard receiver and a microprocessor.

Abstract: An apparatus and method for injecting a substance, such as a radiopharmaceutical, into the bloodstream of a subject. The apparatus comprises an injection means, such as a servo controlled syringe, a means for measuring the concentration of that substance in the subject's bloodstream, and means for controlling the injection in response to the measurement so that the concentration of the substance follows a predetermined function of time. The apparatus of the subject invention functions to inject a substance into a subject's bloodstream at a rate controlled by an error signal proportional to the difference between the concentration of the substance in the subject's bloodstream and the predetermined function.

Abstract: In the preferred and illustrated embodiments, an interactive exercise device is disclosed. One embodiment utilizes an exercise bicycle wherein wheel speed and force are monitored. An electromagnetic brake is adjusted by a control apparatus to relate the measured force to the required force. The electromagnetic brake controls the drag to implement a selected exercise program. The program paces the user through a specified load for a specified interval. The work load can be varied in any manner to achieve a desired exercise program. The interactive apparatus utilizes a video monitor to display an exercise program or race for the user. The race or exercise program is recorded on a video cassette. On playback, the cassette provides video for the monitor to be viewed by the user. The audio track is conveniently used to record instructions which are converted into a drive current for the brake, thereby modifying the drag and required velocity of the user.

Abstract: An ultrasound imaging apparatus is described. The hand-held device includes a first oscillating transducer for providing a B-scan display and an offset second transducer which is manually positioned for providing Doppler data. The transducer pulses are interlaced and Doppler transmissions are inhibited to permit B-scan transmissions. However, circuits provide a continuous signal representing a Doppler signal when the Doppler transmissions are inhibited.