JPS644472B2 - - Google Patents

Description

[Detailed description of the invention]

[Object of the Invention] [Industrial Application Field] The present invention relates to an artificial heart drive device, and more particularly to an artificial heart drive device that drives the artificial heart by alternately applying positive pressure and negative pressure to the artificial heart using a fluid such as air. [Prior Art] From the viewpoint of safety, it is important for an artificial heart to be driven so as to provide blood with a pulsating flow that closely resembles the pulsation of a living heart. Various types of artificial hearts are known, such as diaphragm type, sack type, and piston type, and these are generally driven by receiving a predetermined pressure from a fluid such as air. In order to drive an artificial heart under the best conditions depending on the condition of the living body, a drive device that outputs accurate pressure according to the conditions at a predetermined timing is required. That is, a drive device that can accurately and quickly set the heart rate, positive pressure, negative pressure, duration or duty ratio for applying positive pressure and negative pressure to predetermined values to predetermined values is desirable. [Problems to be Solved by the Invention] In conventional artificial heart drive devices, mechanical pressure reducing valves and the like are used in the positive pressure system and the negative pressure system, respectively, as means for obtaining accurate pressure. However, the output pressure of a mechanical pressure reducing valve fluctuates depending on the magnitude of the load, that is, the flow rate. In artificial heart drive devices,
The output end of the positive pressure system and the output end of the negative pressure system are connected to each other, and negative pressure becomes a load on the positive pressure system, and positive pressure becomes a load on the negative pressure system, so for example, when adjusting the negative pressure, Accordingly, the load on the positive pressure system changes and the positive pressure also changes, and when the positive pressure is adjusted, the load on the negative pressure system changes and the negative pressure also changes, causing interference between the positive and negative pressure systems. For this reason, conventionally, when adjusting the pressure,
Even when adjusting one pressure, operate two pressure reducing valves at the same time while checking the two pressure displays, and be careful to update one pressure while maintaining the other pressure at the specified value. However, there was a problem in that it required skill and time to adjust the pressure. The condition of a patient using an artificial heart can change rapidly, so in such cases, it is more effective in preserving life if the artificial heart's driving pressure can be updated quickly to match the condition of the living body. . By the way, this type of artificial heart drive device has to be equipped with many devices such as a compressor, a vacuum pump, a tank (accumulator), a solenoid valve, and a control device, so that the device becomes quite large. Artificial hearts are used, for example, to assist the heart of a living body during surgery, but because there are many doctors and instruments around the operating table during surgery, a large artificial heart drive is required during surgery. The device cannot be placed near the operating table. However, it is necessary to be able to change the heart rate of the artificial heart at any time depending on the patient's physical condition. For this reason, conventionally, the artificial heart drive device has been placed at a location away from the operating table, and the operation of the artificial heart drive device has been performed by a dedicated operating physician under the instructions of the operating surgeon. However, in order to drive the artificial heart under optimal conditions, it is desirable for the surgeon to directly operate the artificial heart drive device. Since conventional artificial heart drive devices use mechanical pressure reducing valves, they are difficult to operate and remote control is not possible. An object of the present invention is to provide an artificial heart drive device that can quickly and accurately adjust positive pressure and negative pressure for driving an artificial heart without affecting each other. [Structure of the invention] [Means for solving the problem] In order to achieve the above object, the present invention includes the following:
As a means to obtain the required pressure, electromagnetic valves are provided in the positive pressure system and the negative pressure system, and the pressure is adjusted by controlling the opening and closing of these valves. This pressure adjustment is carried out by changing the ratio of the opening time and closing time of the solenoid valve so that the target pressure and the pressure detected by the pressure detection means are equal, or when the pressure changes beyond the target value. It is controlled to switch between open and close states. [Operation] According to this, the positive pressure system and the negative pressure system are each independently feedback-controlled, so even if the pressure of one system is changed or adjusted, the pressure of the other system is maintained the same as before the adjustment. Furthermore, by controlling the pressure with a solenoid valve, it becomes possible to electrically change all of the drive parameters of the artificial heart. In addition,
If a remote control device is provided, drive parameters can be remotely controlled from a location away from the drive device main body. Since the artificial heart drive device is quite large, it cannot be placed near the operating table during surgery, but if it can be controlled remotely, the doctor can constantly check the artificial heart drive conditions while monitoring the patient's condition. can be maintained in an optimal state suitable for the state of the living body. The remote control device has a switch means provided inside a case whose operation surface is covered with a flexible material. According to this, since the switch means is not exposed, it is possible to prevent blood, chemicals, etc. from entering the inside of the remote control device and cause poor contact, etc., and it is also possible to use the remote control device repeatedly by cleaning. Further, when the switch means is operated, a predetermined sound is emitted to notify that the switch is being operated. According to this, it is possible to prevent the switch from being operated by mistake. Furthermore, as a solenoid valve for pressure regulation, a fixed magnetic core and a movable magnetic core are arranged at the axis of the electric coil, and the movable magnetic core is movable in the direction along the axis relative to the fixed magnetic core. A solenoid control valve is used. This type of solenoid valve has good responsiveness and can perform highly accurate pressure control. Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of one type of artificial heart drive device implementing the present invention. This will be explained with reference to FIG. 1 is the main body of the artificial heart drive device, 1a
1 is an operation panel, 1b is a display panel, and 1c is a connection panel. The inside of the display panel 1b shows the positive pressure, negative pressure, and duty ratio of positive pressure and negative pressure for the right heart, the positive pressure, negative pressure, and duty ratio of positive pressure and negative pressure for the left heart, heart rate, and The pressure on the right and left side (yin/yang) is displayed. On the connection panel 1c,
Cable of the remote control unit (remote control means) REM that can be attached and detached with a connector, and tubes 2a and 2 that apply pressure to the right and left artificial hearts.
b is connected. The artificial heart drive device main body 1 is movably supported by four casters 3. FIG. 2a is a front view showing the remote operation unit REM, and FIG. 2b is an enlarged cross-sectional view taken along the line -- in FIG. 2a. This will be explained with reference to FIGS. 2a and 2b. The remote control unit REM is capable of remotely controlling all parameters of the main body of the artificial heart drive device, and has 14 control units S1 to S14.
have. The operating sections S1 to S4 are for increasing positive pressure, decreasing positive pressure, increasing negative pressure, and decreasing negative pressure, respectively on the left side, and the operating sections S5 to S8 are increasing positive pressure, decreasing positive pressure, increasing negative pressure, and decreasing negative pressure, respectively, on the right side. The operation parts S9 and S10 respectively increase the duration of positive pressure or negative pressure (or the duty of positive pressure and negative pressure) on the left side,
The operating sections S11 and S12 are for increasing and decreasing the duration of the positive pressure or negative pressure on the right side, and the operating sections S13 and S14 are for increasing and decreasing the heart rate, respectively. PL is a light emitting diode that indicates that the artificial heart drive device is powered on and that REM is connected to the main body, and SP is a speaker that outputs a sound to notify when the switch is pressed. remote operation board REM
The casing 4 is made of synthetic resin. Inside the casing 4, key switches SW9 with relatively short strokes are installed at positions corresponding to each operating section.
A printed circuit board 5 with SW 11 mounted thereon is fixed. A hole is made in the casing 4 at the position of each operation part, and a flexible film 6 is pasted to cover the surface of the hole to make the internal switches etc. waterproof. 7 and 8 are remote operation boards
This is a hole made to attract the REM to a predetermined position. FIG. 3 is a perspective view of the caster 3, FIG. 4a, FIG. 4b, FIG. 4c, and FIG. 4d are a front view, a left side view, a right side view, and a vertical sectional view of the casing 31 constituting the caster 3, respectively. FIG. 5 is a front view of the bolt 32 for fixing the caster 3;
6a and 6b are a front view and a left side view of the stand 33 that supports the caster 3, and FIG. 7 is a partially cutaway front view showing the connection between the artificial heart drive device main body 1 and the caster 3. Figure 3, 4a
4b, 4c, 4d, 5, 6a, 6b and 7. The casing 31 has three holes 31a and 31b.
and 31c are provided. One hole 31a is for connecting the caster body 3a and the casing 31, and the other hole 31b is for connecting the stand 33.
The other hole 31c is for inserting the bolt 32. As shown in FIG. 5, the bolt 32 has a tapered head to make it easier to grip and less likely to slip, and a thread is formed only in a portion near the head. The stand 33 is composed of a plate-shaped portion and a protrusion 34. The protrusion 34 is provided with a hole 34a that communicates with a hole in the casing 31. 33a is a hole for a bolt for fixing the stand 33 to the main body 1 of the artificial heart drive device. Normally, the artificial heart drive device main body 1 and the caster 3 are the seventh
As shown in the figure, they are connected to form a single body. That is, the protrusion 34 of the stand 33 fixed to the artificial heart drive device main body 1 is inserted into the hole 31b of the caster 3, the holes 31c and 34a are aligned, and the bolt 32 is inserted into the hole and fixed. 35 is a sterilized sealing vinyl, and 36 is a packing. What makes the casters removable in this way is
This is so that dirty casters can be replaced with sterilized casters. When transporting an artificial heart drive device into a clean room, operating room, etc.,
From the artificial heart drive device in the state shown in the figure, replace the caster at the entrance of a clean room, etc. as follows. First, the bolt 32 is unscrewed and removed, and since the engagement between the hole 31b and the protrusion 34 is relatively tight, the caster 3 is rotated relative to the protrusion 34 and removed. After removing the packing 36 and the sealing vinyl 35, a sterilized caster is inserted into the protrusion 34 and a sterilized bolt is attached. This will be explained with reference to FIGS. 8a, 8b, 8c, 8d and 8e. Figure 8a, 8th
Figure b, Figure 8c, Figure 8d, and Figure 8e are a perspective view and a cross-sectional view (cross section taken along line b-b in Figure 8c) of the tank unit 40 provided inside the artificial heart drive device body 1, respectively. , c- in Figure 8b.
They are a sectional view taken along line C, a partially enlarged sectional view showing the connection between the terminal and the tank, and a partially enlarged sectional view showing the connection between the pressure sensor 41 and the tank. This tank unit 40 has four tanks (accumulators), and one tank unit forms part of a positive pressure system and a negative pressure system for a pair of (left and right) artificial hearts. There is. Each of the four tanks has
Two electromagnetic valves 42, 43 and a pressure sensor 41 are provided. The solenoid valve 43 is of a general open/close control type, and the solenoid valve 42 is a solenoid controlled valve whose opening degree is controlled according to the energization level, as will be described later.
The solenoid valve 42 of each block (tank) has an input port 42a or an output port 42b connected to a hole 45a in a panel 44a, 44b, 44c or 44d, respectively.
45b, 45c, or 45d, and their other ports (output ports or input ports) are open to the space within each block.
The solenoid valve 43 of each block has one port 43a open to the space within each block, and the other port 43b inserted into holes 46a, 46b of panel 46 or holes 47a, 47b of panel 47 and fixed thereto. Each panel 44a, 44b, 44c, 44d
The holes 45a, 45b, 45c, 45d
Tubes 48a, 48b, 48 so as to communicate with
c, 48d are connected. Tubes 48a and 48d are each connected to a vacuum pump that is a negative pressure source, and tubes 48b and 48c are each connected to a compressor that is a positive pressure source. The holes 46a and 46b of the panel 46 communicate with each other, and a tube 49 is connected to the flow path.
Further, the holes 47a and 47b of the panel 47 communicate with each other, and the tube 50 is connected to the flow path. Tubes 49 and 50 are connected to the left and right artificial hearts, respectively. Panel 44a,
Four terminals 51 and a pressure sensor 41 are fixed to each of 44b, 44c and 44d. Terminal 51 and pressure sensor 41 are mounted as shown in Figures 8d and 8e. terminal 5
1 is composed of a rod-shaped conductor 51a and an insulating nipple 51b that holds it. Insulating nipple 51
b is made of Teflon. The panel 44 has a threaded tapered hole, and the insulating nipple 51b has a corresponding shape.
The conductor 51a and the insulating nipple 51b are also fixed with tapered screws. Since these tapered screws perform the sealing function, no special sealing member is required. Each terminal 51 has a solenoid valve 42 and 43.
The lead wire 54 from the solenoid is connected to the connector 52.
and 53. The pressure sensor 41 is fixed to the panel 44 with a tapered screw similar to the terminal 51. This will be explained with reference to FIGS. 9a, 9b, 9c and 9d. Figure 9a, Figure 9b, Figure 9
Figures c and 9d are a plan view, a right side view, a left side view, and an enlarged longitudinal sectional view, respectively, of the electromagnetic valve (electromagnetic control valve) 42 used in this embodiment. The first port 1 is connected to the valve housing 11 of the electromagnetic control valve 42.
2 and a second port 13 are formed. The inner space of the housing 11 is a valve seat 14, and the first port 1
2, a first internal chamber 15 and a second port 13 communicate with each other.
It is divided into a second interior chamber 16 that communicates with the interior. A magnetic coil case 18 is fixed to the valve housing 11 with a sealing material 17 interposed therebetween. case 18
A coil bobbin 20 with a coil 19 wound thereon is inserted, and this is attached to magnetic bases 21 and 22.
is supported. A fixed magnetic core 23 is fixed to the base 21 . The core 23 is hollow,
A non-magnetic guide rod 24 passes through it. A movable magnetic core 25 is fixed to the rod 24. One end of the rod 24 is pushed to the left by a coil spring 26. The other end of the rod 24 passes through a bearing 27 and a bellows 28, and a valve body 29 is fixed to that end. The inner space of the bellows 28 passes through the small holes 30 and 37 into the first inner chamber 15 (as shown) or the second inner chamber 16 (the rod 2
4 is driven to the right). When coil 19 is energized, core 23 - core 2
5-Base 22-Case 18-Base 21-Core 23 generates a circulating magnetic flux, and the core 25 and core 23
The rod 24 moves to the right to the point where this suction force and the repulsive force of the coil spring 26 are balanced, and the valve body 29 moves toward the valve seat 1.
From 4, move away by a distance according to the suction force. The end surface 23a of the core 23 is mountain-shaped, and the end surface 23a of the core 25 is
5a has a concave shape that receives the central cavity, and the inner surfaces 23b of the chevron-shaped protrusions at both ends are tapered. Due to the existence of this taper, the energization level and the amount of movement of the rod 24 (the gear gap between 23a and 25a) are in a proportional relationship over a wide range. Furthermore, this type of solenoid valve has a movable part that has good responsiveness and can perform opening/closing control at high speed. FIG. 10 shows an outline of the configuration of the artificial heart drive device shown in FIG. 1 together with the artificial heart. This will be explained with reference to FIG. 60R and 60L are artificial hearts, which are connected to an artificial heart drive device through tubes 2a and 2b. Tubes 2a and 2b are each connected to an output end of tank unit 40. 61R and 61L are compressors,
62R and 62L are vacuum pumps. The solenoids of the four solenoid valves 42 and the pressure sensor 41 are connected to the control device CON1, and the four solenoid valves 43 are connected to the control device CON2. Arithmetic units CPU1 and CPU2 are connected to the control units CON1 and CON2, respectively. Operation terminals for instructing changes in positive pressure, negative pressure, heart rate, and duty are connected to the input ports of the computing devices CPU1 and CPU2. The operating end is
It consists of a main body operating board SWU provided on the operating panel 1a of the artificial heart drive main body 1 and a remote operating board REM for remote control. The main unit operation board SWU and the remote operation board REM are connected in parallel as described later. A predetermined signal from the sound generator SGU is supplied to the remote operation board REM. Sound generator SGU is arithmetic unit CPU1
and controlled by CPU2. The display device DSU is
It consists of a 7-segment light emitting diode display for numerical display, etc., and is connected to the control device CON1 and
It is dynamically driven by the digit drive signal and segment drive signal from CON2. FIG. 11 shows the configuration of one of the arithmetic units CPU1 and CPU2 shown in FIG. 10. This microcomputer unit uses Hitachi's single board microcomputer unit H62SC01. The H62SC01 uses a 6802 series microprocessor and is equipped with I/O ports, timers, RAM, ROM, etc. The RAM used in this embodiment is CMOS type HM6116. FIG. 12 is a circuit diagram showing the circuit configuration of the remote operation unit REM. SW1 to SW14 are key switches provided corresponding to the operation parts S1 to S14 shown in FIG. 2a, respectively; SP is a speaker;
PL is a light emitting diode. Figures 13a and 13b are control device CON
1 is a circuit diagram showing the configuration of a circuit included in FIG. Integrated circuit (IC) used in control device CON1
The list is shown in Table 1.

[Table] First, explanation will be given with reference to FIG. 13a. Connector J1 is connected to output port P3 of arithmetic unit CPU1, and in order to perform dynamic display, display data from CPU1 is inputted separately into two BCD signals: display digit data and display numerical data. The display data output by the CPU 1 includes positive pressure and negative pressure data for each left and right system. Integrated circuit Z1 decodes the BCD signal of display digit data and applies it to transistors Tr1 to Tr6 and inverter Z14. Transistors Tr1 to Tr6
is connected to the anode (digit electrode) of the light emitting diode display. Integrated circuits Z2 to Z5 each convert the BCD signal of displayed numerical data into a 7-segment signal, and the 7-segment signal is sent to drivers Z6 to Z.
9 to each cathode (segment electrode) of the light emitting diode display. The key switch contact of the main unit operation board SWU and the key switch contact of the remote operation board REM are connected to connector J2.
are connected in parallel in the vicinity of the integrated circuit Z1
2 and Z13. Integrated circuit Z1
2 and Z13 have a circuit for removing chattering of the mechanical contacts, and the signal from which the chattering has been removed is sent to the integrated circuit Z10 via the inverter Z11.
to be applied. The integrated circuit Z10 outputs binary codes corresponding to the pressed key switches to the microcomputer CPU1 in a predetermined priority order.
SSR1 to SSR4 are solid state relays, which are controlled on/off by the output port of the microcomputer CPU1 via the buffer Z15. Solid state relay SSR1~SSR
4 is connected to each electromagnetic valve 42 via a connector J4. This will be explained with reference to FIG. 13b. Z16 is Deitel's 16 channel 12 bit A/D converter.
HDAS-16MC. Z16 terminal BIT1~
BIT12 is the signal output terminal, and BIT1 to BIT4
BIT9 to BIT12 are connected to each other. A 12-bit signal is applied to the input port of the microcomputer CPU1 in two parts of 8 bits each. Switching between BIT1~4 and BIT5~12 is done by CPU1.
This is done by controlling the EN1, EN2 and EN3 terminals of Z16. Terminals A1, A2, A4 and A
8 is for selecting an input channel. The HDAS-16 has 16 channels of input ports, but in this embodiment, 8 channels are connected to the connector J5, and 4 channels receive the signals from each pressure sensor 41, that is, the right positive pressure signal. RPP, right negative pressure signal RNP,
Input the left positive pressure signal LPP and left negative pressure signal LNP. FIG. 14 is a circuit diagram showing the circuit configuration of the control device CON2, and FIG. 15 is a block diagram showing the circuit configuration of the sound generating device SGU. Figures 14 and 15
This will be explained with reference to the figures. A list of integrated circuits used in the control device CON2 and the sound generator VSU is shown in Table 2 below.

【table】

[Table] The control device CON2 has a similar configuration to the above-mentioned control device CON1, but since the control device CON2 does not detect pressure, it is not provided with an A/D converter. Connectors J6 and J7 are connected to ports P3 and P2 of arithmetic unit CPU2, respectively. Connector J10 is connected to a solenoid of electromagnetic valve 43. Integrated circuits Z30 and Z3
1 is connected to the main unit operation board via connector J8.
Each key switch contact point is connected to instruct the SWU and the remote control board REM to increase or decrease the heart rate, and increase or decrease the ratio of the period of applying positive pressure to the period of applying negative pressure on the left and right sides. sound generator
The SGU is mainly composed of three integrated circuits Z36 to Z38. These integrated circuits Z36-Z3
8 produces a signal at the output terminal OUT with a frequency corresponding to the state of each of the six input ports. Connector J
11, a signal "OPEN/CLOSE" indicating whether a key has been operated or not, and a signal "UP/DOWN" indicating whether the operated key is instructing to raise or lower the key.
are input from CPU1 and CPU2, respectively. Reset input terminal of integrated circuits Z36 to Z38
A high level H is applied to RES when no key is pressed, and Z36 to Z38 are reset. When a low level L is applied to the reset input terminal RES, the output terminal of Z36 has the following logic level depending on the logic level of the output terminal of the OR gate OR1.
A 3.2KHz or 1.6KHz pulse signal appears. Z
37 always outputs a 2 Hz pulse signal when the RES terminal is L, and applies that signal to the input port of Z38. When the output end of Z37 is H, Z38 outputs the 3.2KHz or 1.6KHz pulse signal from Z36 as it is to the output end, and when the output end of Z37 is L, it halves the pulse signal from Z36.
Outputs the frequency-divided signal to the output terminal. Therefore,
For example, if you press the left pressure increase operation section S1 on the remote operation board REM, the UP/
The DOWN signal becomes H, the close/open signal from CPU1 becomes H, a 3.2KHz pulse signal appears at the output end of Z36, and the frequency changes to 3.2KHz or 1.6KHz at the output end of Z38 every 0.5 seconds. , a pulse signal appears. Further, when the left pressure reduction operation part S2 is pressed, a 1.6KHz pulse signal appears at the output end of Z36, and a pulse signal whose frequency changes to 1.6KHz or 0.8KHz every 0.5 seconds appears at the output end of Z38. This signal is the remote control board
Applied to the REM speaker. FIGS. 16a, 16b, and 16c show the general operation flow of the arithmetic unit CPU1, and each
It is a flowchart of a main program, an interrupt processing program, and a tank pressure input subroutine. Figure 10, Figure 13a, Figure 13b, Figure 16
With reference to Figures a, 16b and 16c
The operation of CPU1 will be explained. First, to explain the outline, the arithmetic unit CPU1 reads key inputs on the main body operation board SWU or remote operation board REM,
Reading of each tank pressure (pressure sensor 41), constant pressure control of each tank pressure (duty control of solenoid valve 42), changing pressure parameters according to key input,
Outputs display data and instructs sound generation. When the power is turned on, initial values are set for each parameter and interrupts are enabled. In this example, the initial values are RPP, RNP, LPP and LNP
respectively +30, -30, +100 and -50 [mmHg]
The upper and lower limits of each pressure are 0/+150, -100/0, 0/+300 and -150/0, respectively.
It is set at 0 [mmHg]. Interrupts are generated periodically every 4ms by a timer in the CPU1. When an interrupt occurs, the microprocessor executes the interrupt handling routine shown in FIG. 16b. In the interrupt processing routine, first select the A/D converter Z16, change the input channels to CH0, CH1, CH3, and CH4 in order to calculate the pressure RPP,
A/D converting RNP, LPP and LNP in order,
Read the converted digital data. Furthermore, "1" or "0" is output to a predetermined port of P3 to control the solid state relays SSR1 to SSR4 and turn the four solenoid valves 42 on or off.
This on/off switching is done according to the duty parameter set in the memory of CPU1.
This is done by switching from on to off once every n2 interrupts, and switching from off to on once every n2 interrupts. Therefore, by changing the parameters, the duty ratio between the on time and off time of the solenoid valve 42 is changed. This duty ratio is
The pressure of the tank is maintained at a predetermined pressure by controlling according to the comparison result between the detected pressure of each tank and the target pressure. In the tank pressure input subroutine, the pressure data of each tank read from the A/D converter Z16 is averaged and the data is converted into 4-digit decimal data for display. The reason for averaging the pressure data is to remove short-term minute fluctuations in pressure due to opening and closing of valves. When a key is input, it is determined which key was pressed, and the parameter associated with that key is increased (or decreased) little by little. It also determines whether the pressed key instructs up or down, applies an open/close signal and an UP/DOWN signal to the connector J11, and generates a predetermined sound from the speaker of the remote operation board REM. Note that the mnemonic code RTI shown in FIG. 16b indicates a return instruction (return from interrupt), and RTS indicates a return instruction (return from subroutine). FIG. 17 is a flowchart showing the general operation of the arithmetic unit CPU2. The operation will be explained with reference to FIG. When the power is turned on, the microprocessor first sets each I/O port to its initial state, and calculates the heart rate, the ratio of the time for applying positive and negative pressure to the left and right sides (duty, or the duration of positive pressure and negative pressure). time) parameters to their initial values.
In this example, the initial values of each parameter are the heart rate of 100 rpm, the duty of the left artificial heart to 45% (duration 270 ms), and the duty of the right artificial heart to 55% (duration 330 ms). There is. In interrupt processing, the logic level of a predetermined output port is changed from "1" to "0" at a certain timing according to a predetermined parameter (heart rate).
Or update from "0" to "1", control solid state relays SSR5 to SSR8, and solenoid valve 43
Open and close. It also outputs display data (digit data and segment data). When a key is input, the key operation is continued while determining which key was pressed and checking whether the value of the parameter associated with that key exceeds the upper or lower limit. Increment or decrement while Arithmetic processing is performed on various parameters related to that parameter. This process is
Jump to each subroutine. The subroutine group includes a subroutine that calculates the duration of one beat related to heart rate, a subroutine that calculates the duration of the left artificial heart, a subroutine that calculates the duration of the right artificial heart, a subroutine that calculates the duty of the left artificial heart, It consists of a subroutine that calculates the duty of the right artificial heart, a subroutine that performs division, a subroutine that performs multiplication, etc. When this calculation is completed, each updated parameter is recorded in the display memory, and after a predetermined period of time, the process returns to the interrupt wait process. When the next interrupt occurs, the updated data will be displayed. In the above embodiment, the solenoid valve 42 is always energized to open and close, and the duty of the opening time and the closing time is changed to control the pressure. 42 may be energized. In addition, in the example, the remote operation board
Although a sound of a predetermined frequency is generated from the REM's speaker, it is also possible to output the parameter corresponding to the pressed key as a sound. In that case, a circuit configuration as shown in FIG. 18 may be used, for example. In Figure 18, Z39, Z4
0 and Z41 are Texas Instruments TMS1000, TMS5100 and TMS5100, respectively.
It is TMS6100. TMS1000 is a microprocessor, TMS5100 is a speech synthesis chip, and TMS6100 is a
It is a 128Kbit mask ROM. Connector J11
is connected to the arithmetic units CPU1 and CPU2, and outputs a predetermined sound generation command from each arithmetic unit CPU1 and CPU2 to the microprocessor Z36.
Remote operation board REM outputs audio signals
supply to the spacer. [Effect] As described above, according to the present invention, the driving pressure to be applied to the artificial heart is generated using the solenoid valve, the pressure detection means, and the pressure storage tank, so the driving pressure actually applied to the artificial heart pump is The target pressure set by the operator for each pressure and negative pressure is maintained accurately at all times, and the operator does not need to monitor pressure fluctuations or correct the set pressure, and only needs to set the target pressure once. By simply adjusting the pressure, the pressure can be adjusted so as to obtain a pump operation that best matches the pulsation rhythm of the living body and the amount of blood delivered that the living body requires. Moreover, even when adjusting the pressure, there is no interference in pressure changes between the positive pressure system and the negative pressure system, so the operator can adjust the pressure of the positive pressure system and negative pressure system completely independently. Even if conditions change, the driving pressure can be immediately updated to the value required by the living body at that time, making it easy to adjust pressure to follow changes in the living body, and achieving remarkable effects in preserving life. .

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of an artificial heart drive device showing one embodiment, and Fig. 2a is a remote control unit.
A front view of the REM, Figure 2b is an enlarged sectional view taken along the - line in Figure 2a, Figure 3 is a perspective view of the caster, and Figure 4 is a perspective view of the caster.
Figures a, 4b, 4c and 4d are front views of the casing constituting the caster, respectively;
A left side view, a right side view, and a vertical sectional view; FIG. 5 is a front view of bolts that fix the caster; FIGS. 6a and 6b are a front view and left side view of the stand that supports the caster; FIG. 7 8a, 8b, 8c, and 8 are partially cutaway front views showing the connection between the artificial heart drive device main body and the caster;
Figure d and Figure 8e are a perspective view, a cross-sectional view, and a cross-sectional view, respectively, showing the tank unit in the artificial heart drive device.
A sectional view taken along the line CC in Fig. 8b, a partially enlarged sectional view showing the connection between the terminal and the tank, and a partially enlarged sectional view showing the connection between the pressure sensor and the tank, Fig. 9a,
9b, 9c, and 9d are a plan view, a right side view, a left side view, and an enlarged vertical sectional view of the electromagnetic valve 42, respectively, and FIG. 10 is an outline of the configuration of the artificial heart drive device shown in FIG. 1. 11 is a block diagram showing the configuration of the arithmetic unit CPUs 1 and 2 shown in FIG. 10, FIG. 12 is a circuit diagram showing the configuration of the remote operation unit, and FIGS. 13a and 13b.
The figure is a circuit diagram showing the circuit configuration of the control device CON1 shown in FIG. 10, FIG. 14 is a circuit diagram showing the circuit configuration of the control device CON2 shown in FIG. Block diagram shown,
16a, 16b, and 16c are flowcharts of a main routine, an interrupt processing routine, and a subroutine showing the operation flow of the arithmetic unit CPU1, and FIG. 17 is a flowchart of the arithmetic unit CPU2.
FIG. 18 is a block diagram of a sound generating device according to another embodiment of the present invention. 1: Artificial heart drive device main body, 2a, 2b: tube, 3: caster, 4: casing, 5: printed circuit board, 6: film, 7, 8: hole, 11:
Valve housing, 12, 13: Port, 14: Valve seat, 15, 16: Inner chamber, 17: Seal material, 18:
Coil case, 19: Coil, 20: Bobbin, 2
1, 22: Magnetic base, 23: Fixed magnetic core, 24: Guide rod, 25: Movable magnetic core, 26: Coil spring, 27: Bearing, 2
8: bellows, 29: valve body, 30, 37: small hole,
31: Casing, 32: Bolt, 33: Stand, 34: Protrusion, 35: Sealing vinyl, 3
6: Gasket, 40: Tank unit (positive, negative pressure accumulation tank), 41: Pressure sensor (positive, negative pressure detection means), 42: Solenoid valve (positive, negative pressure adjustment solenoid valve), 4
3: Solenoid valve (positive/negative pressure switching solenoid valve), 44, 46,
47: Panel, 45: Hole, 48, 49, 50: Tube, 51: Terminal, 52, 53: Connector, 6
1R, 61L: Compressor (positive pressure generation means),
62R, 62L: Vacuum pump (negative pressure generation means),
CPU1, CPU2: Arithmetic unit (control means), S1~
S8: Operation unit (pressure setting means), S9 to S14:
Operation unit (positive/negative pressure switching timing setting means).

Claims (1)

[Claims] 1 Positive pressure generating means; Positive pressure accumulating tank; Positive pressure regulating solenoid valve whose input end is connected to the output end of the positive pressure generating means and whose output end is open into the positive pressure accumulating tank; Input end A positive pressure switching solenoid valve that is opened into the positive pressure accumulator tank; Positive pressure detection means provided between the positive pressure regulating solenoid valve and the positive pressure switching solenoid valve; Negative pressure generating means; Negative pressure accumulating tank; Input end A negative pressure adjustment solenoid valve whose output end is connected to the output end of the negative pressure generating means and whose output end is opened into the negative pressure accumulation tank; Negative pressure switching solenoid valve whose input end is opened into the negative pressure accumulation tank; Negative pressure adjustment negative pressure detection means provided between the solenoid valve and the negative pressure switching solenoid valve; a tube connecting the output end of the positive pressure switching solenoid valve and the output end of the negative pressure switching solenoid valve to the driving fluid chamber of the artificial heart pump; Pressure setting means; Positive and negative pressure switching timing setting means; and A positive pressure adjustment solenoid valve and a negative pressure adjustment solenoid valve, respectively, so that the detected pressure of the positive pressure detection means and the negative pressure detection means and the pressure set by the pressure setting means are equalized. An artificial heart drive device comprising: control means for controlling opening and closing of a positive pressure switching solenoid valve and a negative pressure switching solenoid valve at timings set by the positive and negative pressure switching timing setting means; 2. A positive pressure regulating solenoid valve and a negative pressure regulating solenoid valve are arranged with a fixed magnetic core and a movable magnetic core at the axis of the electric coil, and the movable magnetic core is arranged in a direction along the axis with respect to the fixed magnetic core. The artificial heart drive device according to claim 1, wherein the artificial heart drive device is an electromagnetic control valve that is movable. 3. The electromagnetic control valve has a fixed magnetic core and a movable magnetic core whose mutually opposing surfaces are shaped like a mountain in their longitudinal section, and the other is a concave shape that receives the central protrusion. The artificial heart drive device according to claim 2, wherein the inner surface of the protrusions at both ends or the outer surface of the concave protrusions at both ends are tapered. 4. The artificial body according to claim 1, wherein the control means is connected to an operation board having at least a switch means for setting a control target pressure, and a linear flexible connection means. Heart drive device. 5. The connecting means is an electrical conductor cable;
An artificial heart drive device according to claim 4.