JPH0349710Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is an improvement on a roller pump used as a heart-lung machine or an auxiliary circulation pump to produce an arterial waveform similar to that of a living body. It concerns pumps.

“Conventional technology” Conventionally, roller pumps that generate pulsatile blood flow
As shown in FIG. 4, there is a tube 2, a part of which is curved along the inner surface of a horseshoe-shaped raceway 1, through which blood flows, and the curved portion of the tube 2 is controlled by rollers 3a, 3a at both ends. It is equipped with a rotating roller 3 that handles and sends out the blood in the tube 2. In this pump, the number of rotations of the rotating roller 3 is set and fixed in advance so as to obtain the required amount of blood, and the rotating roller 3 is continuously rotated by a rotary machine. A pulsatile flow is obtained by performing the operation intermittently.

"Problems to be Solved by the Invention" By the way, the above conventional blood circuit for extracorporeal circulation has the following problems, and it is desired to solve them.

That is, as mentioned above, one beat is made up of multiple rotations of the rotating roller, so the fifth
As shown in the figure, the problem is that the generated pulse pressure waveform has a sawtooth shape and cannot be close to that of a living body, and the discharge is caused by multiple consecutive rotations of a rotating roller with two rollers. Since one pulse is generated by overlapping the flow rates, the problem is that the rise is slow and sufficient pulse pressure is not obtained.

This invention was made in view of the above circumstances, and its purpose is to provide a pulsatile flow pump that can easily obtain an arterial pressure waveform close to that of a living body.

``Means for solving the problem'' The pulsatile flow pump of this invention has two or three rotating rollers, and all or part of the blood tube is composed of a soft tube with a rubber hardness of 70° or less. At the same time, a channel opening/closing device is provided on the outlet side of this flexible tube, and an opening/closing command is provided to instruct the channel opening/closing device to open/close the channel based on the output signal of an electrocardiographic device such as an electrocardiograph or a pacemaker. The device is characterized by being equipped with a device.

"Operation" According to the above configuration, the rotating roller rotates continuously, and the plurality of rollers treat the soft tube in a closed state, and accordingly, a predetermined flow rate of blood is discharged from the tube on the raceway. When the channel opening/closing device is driven by an opening/closing command device based on an electrocardiographic device and the channel is blocked on the outlet side of the tube, a pressure is generated inside the tube between the pressure-closing part by the roller and the channel opening/closing device. The handling of the rollers causes blood to be pumped in continuously, increasing blood pressure within the tube. In this case, since the tube is composed of a soft tube with a hardness of 70° or less, the internal pressure is kept almost constant even if the inflow volume into the pressure-closing tube varies somewhat. Thereafter, when the flow path opening/closing device is driven by the opening/closing command device based on the electrocardiogram device and the flow path is opened, the blood whose pressure has increased in the tube is rapidly pumped into the blood circulation system, thereby lowering the pulsatile arterial pressure. It is formed. In this configuration, the capacity stored in the flexible tube between the flow path opening/closing device and the end of the raceway corresponds approximately to the one-stroke output flow, and the raceway and rotating roller are connected while the outlet side of the tube is closed. The pressure generated in the tube, which is continuously kept under pressure and supplied with blood, forms the pulsatile arterial pressure.

In this way, one pulsation is formed when blood is continuously stored in the soft tube and the amount of blood that reaches a predetermined pressure is discharged, so the pulsation pressure waveform of the pulsation that occurs is is smooth and not serrated. Further, since the pulsating pressure is generated by keeping the outlet side of the tube closed for a predetermined period of time while the tube is being handled by the rotating roller, sufficient pulsating pressure can be obtained. In addition, in this pulsatile flow pump, the opening and closing of the flow path is controlled based on the output signals of electrocardiographic devices such as electrocardiographs and pacemakers, so the pulsatile blood flow that is suitable for the living body is controlled. can be supplied at the optimal time.

This invention will be explained in more detail below using examples.

"Embodiment 1" FIG. 1 shows an embodiment of this invention, and in the figure, reference numeral 10 indicates a raceway.
The raceway 10 is a horseshoe-shaped member having an arcuate inner peripheral surface, and a soft tube 11 is disposed along this inner peripheral surface.

This soft tube 11 is made of a rubber-like material with a rubber hardness of 70° or less, and can withstand relatively high internal pressure through deformation, and even if the amount of inflow into the tube changes, the internal pressure has become almost constant. This soft tube 11
Two rollers 12a, 12a of a rotary roller 12 having the same structure as the conventional rotary roller are brought into contact with the tube 11 so as to close it. Further, at a position a predetermined distance away from the raceway 10 on the exit side of the soft tube 11, there is a channel opening/closing device 13 consisting of a push rod 13a and an occluder 13c opposed to the push rod 13a and moved up and down by a solenoid 13b. is provided, and this soft tube 1
One flow path can be opened and closed as desired.

An opening/closing command device 14 is electrically connected to the channel opening/closing device 13.
Electrocardiographic devices such as electrocardiographs and heart rate pacemakers 1
5 is also electrically connected. The opening/closing command device 14 is configured to detect the output signal of the electrocardiographic device 15, and based on this signal, send a signal to the solenoid 13b of the channel opening/closing device 13 at appropriate intervals to open and close the channel. ing.

In the figure, the reference numeral 16 is a pressure sensor that measures and displays the internal pressure of the soft tube 11 between the raceway 10 and the flow path opening/closing device 13, and the reference numeral 17 is a pressure sensor that measures and displays the internal pressure of the soft tube 11 between the raceway 10 and the flow path opening/closing device 13. The pressure sensor 18 measures and displays the internal pressure, and the reference numeral 18 indicates an electromagnetic flowmeter that measures and displays the flow rate of blood flowing from the channel opening/closing device 13 into the blood channel between living bodies. These pressure gauges 16, 17 and flow meter 18 are used to monitor the blood pressure and flow rate supplied to the living body so that they are within safe and appropriate ranges.

According to the above configuration, first, a closing signal is sent from the opening/closing command device 14 to the solenoid 13 in synchronization with the heartbeat of the living body.
b, and when the flow path is closed, the roller 12
a, 12a are continuously rotating and blood is continuously flowing out, so blood is forced into the soft tube 11 between the channel opening/closing device 13 and the raceway 10, and the internal volume and internal pressure increase. do. The flow path is opened after a predetermined time has elapsed based on the heartbeat of the living body. Then, a predetermined amount of blood at a predetermined pressure in the soft tube 11 is pulsatilely delivered to the blood circulation system of the living body. After this, the roller 12 continues to rotate, blood continues to flow, and then,
By repeating the above steps based on the heartbeat of the living body, an arterial pressure waveform very similar to that of the living body can be generated in the blood circulation system.

FIG. 2 shows the pressure waveform and flow rate waveform obtained when operating the pulsating flow pump having the above configuration in comparison with the waveform of the conventional pulsating flow pump. Figure a on the left is the waveform of a conventional pump,
Figure b on the right is the waveform of the pulsatile flow pump of the present invention. In addition, in the figure, the A curve is the pressure waveform in the soft tube 11 between the channel opening/closing device 13 and the raceway 10 measured by the pressure sensor 16, and the B curve is the pressure waveform from the channel opening/closing device 13 measured by the pressure sensor 17. The pressure waveform in the blood flow path between living bodies, the C curve is the flow path waveform measured by the electromagnetic flow meter 18, the D curve is the average flow waveform, and the E curve is the differential amount of the pressure waveform shown by the B curve, that is, It is a curve showing the amount of pressure change per second of pulsatile flow. As is clear from this figure 2, compared to the waveform of the conventional pump shown in figure a on the left, which is a continuous waveform consisting of small sawtooth waves,
The waveform of the pulsatile flow pump of the present invention is smooth and very close to the arterial pressure waveform of a living body.

"Embodiment 2" FIG. 3 shows a second embodiment of this invention, and parts common to those in FIG. 1 are given the same reference numerals to simplify the explanation. The pulsatile flow pump of this embodiment is characterized by the structure of the tube 20 through which blood flows. This tube 20 has a branched portion 20a whose tip is closed on the exit side of the raceway 10, and this branched portion 20a is made of a rubber-like material having a rubber hardness of 70° or less.

According to this configuration, blood that is press-fitted into the tube 20 between the flow path opening and closing device 13 and the raceway 10 after the flow path is closed by the flow path opening and closing device 13 flows into the branch portion 20a made of a soft tube. stored,
The blood stored in this branch portion 20a flows out toward the living body when the flow path is opened, forming a pulsatile flow. Other configurations and operations are similar to those of the pulsatile flow pump of the first embodiment. The advantage of this embodiment is that only a portion of the tube can be made of a soft tube, thereby reducing material costs.

In each of the above embodiments, a commercially available rotary roller with two rollers was used, but a commercially available rotary roller with three rollers may also be used.

"Effects of the invention" As explained above, the pulsatile flow pump of this invention has two or three control rollers, and all or part of the blood tube has a rubber hardness.
Consists of a soft tube with a diameter of 70° or less,
A channel opening/closing device is provided on the outlet side of the flexible tube, and an opening/closing command device is further provided to instruct the channel opening/closing device to open/close the channel based on the output signal of an electrocardiographic device such as an electrocardiograph or a pacemaker. It is characterized by:

Therefore, according to the pulsatile flow pump of the present invention,
Since one beat is formed by the continuous accumulation of blood in the soft tube and the ejection of blood that has reached a predetermined pressure, the pulse pressure waveform of the generated beat is smooth and smooth. Not tooth-like. Further, since the pulsating pressure is generated by keeping the outlet side of the tube closed for a predetermined period of time while the tube is being handled by the rotating roller, sufficient pulsating pressure can be obtained. In addition, in this pulsatile flow pump, the opening and closing of the flow path is controlled based on the output signals of electrocardiographic devices such as electrocardiographs and pacemakers, so the pulsatile blood flow that is suitable for the living body is controlled. can be supplied at the optimal time.

[Brief explanation of the drawing]

Figure 1 shows the first embodiment of this invention.
Schematic diagram of the pulsatile flow pump according to this invention, Part 2
The figure is a graph showing the pressure waveform and flow rate waveform obtained by the pulsatile flow pump of the first embodiment and the waveform of a conventional pulsatile flow pump, and Fig. 3 shows the second embodiment of this invention. Fig. 4 is a schematic diagram of the pulsatile flow pump of this invention, Figure 4 is a schematic diagram of a conventional pulsatile flow pump, and Figure 5 is a graph showing the arterial pressure waveform generated by the conventional pulsatile flow pump. be. 10... Raceway, 11... Soft tube, 12... Rotating arm, 12a... Rotating roller, 13... Channel opening/closing mechanism, 13a... Push rod, 13b... Solenoid, 13c... Occluder, 14... Opening/closing command device, 15... Electrocardiographic equipment, 20... Tube, 20a... Branch portion (soft tube).

Claims (1)

[Scope of Claim for Utility Model Registration] A pulsatile flow pump that supplies pulsatile blood flow to a living body by handling a tube through which blood circulates in a closed state with a horseshoe-shaped raceway and a rotating roller, which rotates as described above. The number of rollers is two or three, and all or part of the blood tube is composed of a soft tube with a rubber hardness of 70° or less,
A channel opening/closing device is provided on the outlet side of the flexible tube, and commands are given to the channel opening/closing device to open and close the channel based on an output signal from an electrocardiographic device such as an electrocardiograph or a cardiac pacemaker. A pulsating flow pump characterized by being equipped with an opening/closing command device.