JPH0611311B2 - Auxiliary ratio setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a medical device for alternately supplying positive pressure and negative pressure to drive a medical device such as an artificial heart or an intra-aortic balloon pump. The present invention relates to an auxiliary ratio setting device that is connected to a drive device and adjusts the auxiliary ratio.

(Prior Art) These auxiliary ratio setting devices include, for example, those described in US Pat. No. 4,016,871. This relates to a drive device for an intra-aortic balloon pump, which includes a device for alternately supplying positive pressure and negative pressure, and a balloon drive chamber is arranged between the supply device and the balloon pump. This balloon driving chamber is for converting the air pressure pulse created by the supply device into a helium gas pressure pulse, and while driving the balloon pump with helium gas which is a safe drive medium for the living body, Adjust the amount of helium gas ejected to the pump.

The balloon driving chamber is configured such that the inside thereof is divided by a silicon diaphragm so that air and helium gas are not mixed. Further, a chamber is further provided by the diaphragm between the silicon diaphragm and the outer case. A stroke volume setting syringe is connected to this chamber, and the stroke amount of the silicon diaphragm can be adjusted by adjusting the amount of water in the chamber by this syringe. The auxiliary ratio is set by adjusting the stroke amount.

(Problems to be Solved by the Invention) However, in this auxiliary ratio setting device, the stroke amount is adjusted by increasing or decreasing the volume on the secondary side in the balloon driving chamber to set the auxiliary ratio. While the device is operating, the primary side of the balloon driving chamber is supplied with the pneumatic pulse generated by the supply device. Therefore, the pressure on the secondary side also fluctuates according to the pressure fluctuation on the primary side. For this reason, the pressure applied to the syringe fluctuates every moment, making it very difficult to adjust the stroke amount. For this reason, normally, the pressure supply device is stopped, the pressure is not applied to the primary side of the balloon driving chamber, and then the stroke amount is adjusted by the syringe.

Therefore, the technical problem of the present invention is to make it possible to easily set the auxiliary ratio even when the pressure on the primary side of the chamber is fluctuating.

[Structure of Invention]

(Means for Solving the Problems) In order to solve the above technical problems, the technical means used in the present invention are, as an auxiliary ratio setting device, a positive pressure supplying means 11 for supplying a positive pressure and a negative pressure supplying means. Negative pressure supply means 1
2. Gas pressure by being connected to the output terminals of the positive pressure supply means 11 and the negative pressure supply means 12 and switching the supply pressure from the positive pressure supply means 11 and the negative pressure supply means 12 according to the pulsation rhythm of the living body. Switching means 13, 1 for generating pulses
4, which is connected to a medical pump driving device 10 and a medical pump driving device 30 for driving a medical pump for assisting blood circulation by using the gas pressure pulse, and the medical pump driving device 10 is provided. An on-off valve 21 for connecting and disconnecting between the medical pump 30 and the medical pump 30; a timing setting means 24 for previously setting the shut-off timing of the on-off valve 21 by a switch, and the opening and closing. The on-off valve 21 is connected to the valve 21 and the timing setting means 24, and when the on-off valve 13 of the medical pump drive device 10 is in an open state and starts to supply a positive pressure.
And the driving time T of the medical pump device 10 immediately before after the medical pump driving device 10 starts to supply a positive pressure.
The set time Ts obtained by multiplying m by the auxiliary ratio k is calculated, and the ejection time Tn of the opening / closing valve 13 of the medical pump drive device 10 is T
When n ≧ Ts, the on-off valve 21 is shut off, and when the on-off valve 13 of the medical pump drive device 10 is in the shut-off negative pressure supply state, the on-off valve 2 is synchronized.
The auxiliary ratio setting device is provided with a control device for opening 1.

(Operation) According to the technical means, the positive pressure is supplied to the medical pump only after the medical pump drive device starts to supply the positive pressure until the timing set by the timing setting means. If the setting timing of the timing setting means is changed, the time during which the positive pressure is supplied to the medical pump changes. If the setting timing is late, the flow rate supplied to the medical pump increases, and if the setting timing is early, the flow rate supplied to the medical pump decreases. In this way, since the flow rate of the gas supplied to the medical pump can be changed, the assist ratio of the medical pump to the living heart can be changed.

(Examples) Examples of the present invention will be described below with reference to the drawings. The auxiliary ratio setting device of the present invention is used by being connected to a medical device driving device that generates a gas pressure pulse. Here, the medical device drive device may be one that has been commonly used in the past, and is disclosed in, for example, JP-A-58-1034.
No. 66, Japanese Patent Laid-Open No. 58-169460 and the like can be used for the medical device driving device. Here, an outline of this medical device drive apparatus will be shown and the relationship with the embodiment of the present invention will be described.

Briefly described, the medical device drive apparatus 10 includes a positive pressure supply means 11 for supplying a positive pressure and a negative pressure supply means 12 for supplying a negative pressure, and open / close valves 13 and 14 are connected to each. . Then, the electronic control means 15 alternately switches the on-off valves 13 and 14 at a predetermined timing to generate a gas pressure pulse. The on-off valves 13, 14 and the electronic control means 15 constitute a switching means for generating a gas pressure pulse. Next, the auxiliary ratio setting device 20 of the present invention will be described. The auxiliary ratio setting device 20 includes an opening / closing valve 21, and an input end of the opening / closing valve 21 is connected to an output end of the opening / closing valve 13 which is a gas pressure pulse output end of the medical device driving apparatus 10. The output end of the opening / closing valve 21 is connected to the medical device 30 driven by the gas pressure pulse. The auxiliary ratio setting device 20 further includes an electronic control device 22. The electronic control unit 22 is composed of a microcomputer. The opening / closing valve 21 is opened / closed via a power transistor 23 by a signal from the electronic control unit 22. The electronic control unit 22 includes the medical device driving apparatus 1
The timing at which the switching means of 0 generates the gas pressure pulse is input as a signal from the electronic control means 15, and the blood pressure signal from the blood pressure detection device 26 that detects the blood pressure of the living body is input. An external switch group 24 is connected to the electronic control unit 22 to set various conditions described later. A display device 25 for displaying these signals is connected to the electronic control device 22.

With the above configuration, the auxiliary ratio setting device 20 of the present invention,
The pressure pulse ejected from the medical device driving apparatus 10 is changed by controlling the opening / closing of the opening / closing valve 21 to control the auxiliary ratio.

There are various methods for controlling the opening / closing control timing of the opening / closing valve 21, which will be described below.

The auxiliary ratio k of the medical device 30 is set in advance by the external switch group 24, and the blood pressure value of the living body is controlled based on this auxiliary ratio. The control timing of this mode is shown in FIG. First, the auxiliary ratio k (0 ≦ k ≦ 1) is set by the external switch group 24. Next, the ejection time of the preceding medical device drive device 10, that is, the on-off valve 1
The time Tm during which 3 is open is measured. Here, the ejection time of the medical device driving apparatus 10 immediately before may be an average value of the previous few beats. Then, the ejection time Tm is multiplied by the auxiliary ratio k to calculate the set time Ts (Ts = Tm
Xk). When the opening / closing valve 13 of the medical device drive device 10 is opened to start ejection of positive pressure, the opening / closing valve 21 is opened and the ejection time Tn is measured to set the ejection time Tn. When the time is Ts or more, Tn ≧ Ts, and the opening / closing valve 21 is closed to interrupt the ejection of the positive pressure. The timing at which the on-off valve 21 is opened next is in synchronization with the signal that supplies the negative pressure by closing the on-off valve 13 of the medical device drive device 10 and closing the on-off valve 14 in the same manner as. As mentioned above, the second mode is
There is no need to input the blood pressure signal of the living body. Further, in this mode, the opening and closing of the on-off valve 21 is controlled by the set time obtained by multiplying the control time of the medical device drive by the auxiliary ratio, so this set time follows the control of the medical device drive itself. Can be set. Medical equipment drive
Generally, since the control is performed according to various states of the living body, even in this mode, the assist ratio can be automatically controlled according to the state of the living body.

As described above, according to this mode, the upper limit value and the lower limit value of the ejection pressure are set, and the blood pressure value of the living body is automatically controlled so as to fall within this range.

〔effect〕

As described above, according to the present invention, the assist rate of the medical pump to the living heart can be set by setting the timing. Since there are no obstructive factors in the timing setting, it is possible to easily change the assist ratio even when the medical pump drive device is moving. Therefore, it is easy to change the auxiliary ratio according to the state of the living body.
Also, the supplement ratio can be changed quickly.

Further, in a device having a balloon driving chamber as described in the aforementioned U.S. Pat. No. 4,016,861,
To control the movement of the membrane that separates the primary and secondary sides, 1
A pressure difference occurs between the secondary side chamber and the secondary side chamber, and the membrane is burdened. However, even if a chamber for separating the fluid is installed between the auxiliary ratio setting device and the medical pump drive device of the present invention, the auxiliary ratio can be easily set, and if the on-off valve is shut off, the chamber ratio of 2 can be achieved. Since the secondary side is sealed and the membrane moves so that the pressures on the primary side and the secondary side are equalized, no burden is imposed on the membrane, and if the membrane is less ruptured, it is also effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing an operation mode of the present invention. 10 ... Medical device drive device (medical pump drive device), 11 ... Positive pressure supply means, 12 ... Negative pressure supply means, 13, 14 ... On-off valve (switching means), 15 ... Electronic control means (Switching means), 20 ... auxiliary ratio setting device (auxiliary ratio setting device), 21 ... open / close valve (open / close valve), 22 ... electronic control device (control device, time calculating device, time measuring device, comparing device) , 23 ... power transistor (open / close valve control means), 24 ... external switch group (timing setting means, switches), 25 ... display device, 26 ... blood pressure detection device, 30 ... medical equipment (medical pump) ).

Claims (1)

[Claims] 1. A positive pressure supply means 11 for supplying a positive pressure, a negative pressure supply means 12 for supplying a negative pressure, and a positive pressure supply means connected to the output ends of the positive pressure supply means 11 and the negative pressure supply means 12. 11 and switching means 13, 14 for switching the supply pressure from the negative pressure supply means 12 according to the pulsation rhythm of the living body to generate a gas pressure pulse, and circulating the blood by using the gas pressure pulse. Medical pump drive device 10 and medical pump 30 for driving an auxiliary medical pump
An on-off valve 21 which is connected to the medical pump drive device 10 and connects and disconnects the medical pump drive device 10 and the medical pump 30; Timing setting means 2 for setting
4; and when the on-off valve 21 connected to the on-off valve 21 and the timing setting means 24 and the on-off valve 13 of the medical pump drive device 10 is in an open state and starts to supply positive pressure, the on-off valve 21 is communicated. After the medical pump drive device 10 starts to supply positive pressure, the set time Ts obtained by multiplying the ejection time Tm of the medical pump drive device 10 immediately before by the auxiliary ratio k is calculated, and the medical pump When the ejection time Tn of the on-off valve 13 of the drive device 10 becomes Tn ≧ Ts, the on-off valve 21 is shut off, and the on-off valve 13 of the medical pump drive device 10 is shut off to the negative pressure supply state. A supplementary ratio setting device comprising: a control device that opens the on-off valve 21 in synchronization with the opening.