JPH0459912B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a pulsatile flow pump that produces an arterial waveform similar to that of a living body by improving a roller pump used as a heart-lung machine or an auxiliary circulation pump. It concerns pumps.

[Conventional technology] Conventionally, roller pumps that generate pulsatile blood flow are
As shown in FIG. 7, a tube 2, a part of which is curved along the inner surface of a horseshoe-shaped raceway 1, through which blood flows, a roller 3a having curved portions of the tube 2 at both ends, The tube 2 is equipped with a rotating roller 3 which is handled by the tube 3a and sends out the blood in the tube 2. In this pump, the number of revolutions of the rotary roller 3 is set and fixed in advance so as to obtain the required blood flow, and the rotary roller 3 is continuously rotated by a rotary machine. A pulsatile flow is obtained by performing the operation intermittently.

By the way, the above conventional pulsating flow pump has the following problems.

That is, as mentioned above, one beat is made up of multiple rotations of the rotating roller, so the eighth
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.

In contrast, prior to the present invention, the present inventor provided a pulsatile flow pump that can easily obtain an arterial pressure waveform close to that of a living body (Japanese Patent Application No. 61-288363
No. 62-7742). These earlier applications will be explained below.

9, 10, 11, and 12 are for explaining Japanese Patent Application No. 61-288363, and in FIG. 9, numeral 10 indicates a raceway. This raceway 10 is 120° ~
It is a horseshoe-shaped member having an arcuate inner circumferential surface of up to 160°, and a soft tube 11 is disposed along this inner circumferential surface.

This soft tube 11 is made of a rubber-like material with a rubber hardness of 70 degrees or less, and can withstand relatively high internal pressure through deformation, and the internal pressure remains almost constant even if the pressing force changes. It's starting to happen. This soft tube 11 has a rotating roller 12 attached to one end of a rotating arm 12.
a is in contact with this tube 11 so as to close it. Further, on the outlet side of the soft tube 11, there is a push rod 13a, and an occluder 13c opposite thereto that is moved up and down by a solenoid 13b.
A channel opening/closing mechanism 13 is provided, and the channel of the flexible tube 11 can be opened and closed as desired.

The protruding distance of the rotating roller 12a from the rotating arm 12 can be adjusted using a knob 12b. Reflection plates 14 and 15 are mounted on the rotary arm 12 at different height positions. One reflecting plate 14 is connected to the rotating arm 1
The other reflecting plate 15 is mounted at a position offset by an angle θ ₁ counterclockwise from the rotating roller 12a with the rotation axis of the second reflecting plate 15 as the center, and the other reflecting plate 15 is also mounted at a position offset clockwise by an angle θ ₂ from the rotating roller 12a.
It is installed at a different position.

On the other hand, a sensor 16 that emits light and detects the reflected light is provided near the entrance of the raceway 10, and a sensor 17 having the same structure is similarly provided near the exit of the raceway 10. There is.
The sensor 16 is attached at a height corresponding to the reflecting plate 14, and the sensor 17 is attached at a position corresponding to the reflecting plate 15. In addition to sensors that detect reflected light, such as the sensors 16 and 17, any sensor that has a function of detecting approach can be used in the same manner. When the sensor 16 senses the reflected light, it sends a signal to the solenoid 13b of the channel opening/closing mechanism 13 to open the channel, and when the sensor 17 senses the reflected light, it sends a signal to the solenoid 13b of the channel opening/closing mechanism 13 to open the channel. It is configured to send a signal to the No. 13 solenoid 13b to close the flow path.

In addition, in the said structure, the reflection plates 14 and 15 and the sensors 16 and 17 constitute the opening/closing command means 18.

According to the above configuration, first, before the rotating roller 12 a is applied to the raceway 10 , the soft tube 11 is in a closed state by the channel opening/closing mechanism 13 . In this closed state, the rotating roller 12a rides on the raceway 10 and starts handling the soft tube 11. As the rotating roller 12a rotates, the internal pressure of the tube 11 increases. When the rotating roller 12a rotates by a predetermined angle θ ₁ in this manner, the reflecting plate 14 on the rotating arm 12 is positioned in front of the sensor 16 near the entrance of the raceway 10 and illuminates the sensor 16 with reflected light. The sensor 16 that senses the reflected light sends a signal to the solenoid 13b of the channel opening/closing mechanism 13 to open the channel of the tube 11. the result,
A predetermined amount of blood at a predetermined pressure within the tube 11 is pulsatically pumped out to the blood circulation system. Subsequently, the rotating roller 12a rotates, and the reflecting plate 15 on the rotating arm 12 is connected to the sensor 1 near the exit of the raceway 10.
When reflected light is applied to the sensor 17, the sensor 17 sends a signal to the solenoid 13b of the channel opening/closing mechanism 13 to close the channel of the tube 11. Since this closing timing is set just before the rotating roller 12a comes off the raceway 10, the blood sent into the tube 11 will not flow backwards due to the closure of this flow path. Further, the rotating roller 12a rotates and the raceway 1
No pressure (positive pressure or negative pressure) remains in the tube 11 until the tube 11 reaches 0. In this way, as shown in FIG. 10, an arterial pressure waveform very similar to that of a living body can be generated in the blood circulation system.
Note that the waveform shown in FIG. 10 is when θ ₁ is 50°. Furthermore, in this configuration, if θ ₁ is made larger, for example, 80°, the rise of the generated arterial pressure waveform can be made even faster, as shown in FIG. This is because, as mentioned above, the 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 when the pressing force changes, the internal pressure This is because it is configured to be approximately constant. In this illustrated example, the peak pulse pressure was about 150 mmHg both when θ ₁ was 50° and when θ 1 was 80°.

FIG. 12 shows another configuration example in Japanese Patent Application No. 61-288363, in which parts common to those in FIG. 9 are given the same reference numerals to simplify the explanation. Reference numeral 20 in the figure indicates a rotating arm having a rotating roller 20a at one end thereof, and a cam (opening/closing command means) 2 coaxially and integrally disposed at the center of this rotating arm 20.
1 is attached. A push rod 22a is attached to the right side of the cam 21 in a horizontally movable manner, and is normally biased leftward by a biasing member (not shown). An occluder 22b is attached to the right side of the push rod 22a via a soft tube 11 so that its position in the horizontal direction can be adjusted. The shape of the cam 21 and its fixed position with respect to the rotary arm 20 are as shown by _the dashed line in the figure. The contact is released (the flow path of the tube 11 is opened), and as shown by the dotted line in the figure, the cam 21 and the push rod 22a come into contact with each other just before the rotating roller 20a comes off the raceway 10, and the push rod 22a It is configured to be moved to the right (the flow path of the tube 11 is closed). In addition, in the above configuration, the push rod 22a and the occluder 22
b constitutes a channel opening/closing mechanism 22.

If cams 21 of various shapes are prepared and configured to be detachably attached to the rotating arm 20, the angle θ ₁ can be set variously, and the arterial artery to be generated can be set in various ways. The rise of the pressure waveform can be set appropriately.

Figures 13 and 14 show the earlier application filed in 1983.
7742 describes a pulsatile flow pump. In FIG. 13, numeral 30 indicates a raceway. This raceway 30 is a horseshoe-shaped member having an arcuate inner peripheral surface, and a soft tube 31 is disposed along this inner peripheral surface.

This soft tube 31 is made of a rubber-like material with a rubber hardness of 70 degrees or less, so that it 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 31
There are two rollers 32a, 32 of the rotating roller 32.
a is in contact with this tube 31 so as to close it. Further, at a position a predetermined distance away from the raceway 30 on the exit side of the soft tube 31, there is a push rod 33a, and an occluder 3 opposite thereto that is moved up and down by a solenoid 33b.
A channel opening/closing device 33 consisting of a flexible tube 3c is provided, and the channel of the flexible tube 31 can be opened and closed as desired.

An opening/closing command device 34 is electrically connected to the channel opening/closing device 33.
Electrocardiographic devices such as electrocardiographs and heart rate pacemakers 3
5 is also electrically connected. The opening/closing command device 34 is configured to detect the output signal of the electrocardiographic device 35 and send a signal to the solenoid 33b of the channel opening/closing mechanism 33 at appropriate intervals based on this signal to open/close the channel. ing.

In the figure, the reference numeral 36 is a pressure sensor that measures and displays the internal pressure of the soft tube 31 between the raceway 30 and the flow path opening/closing device 33, and the reference numeral 37 is a pressure sensor that measures and displays the internal pressure of the soft tube 31 between the raceway 30 and the flow path opening/closing device 33. Reference numeral 38 indicates a pressure sensor that measures and displays internal pressure, and an electromagnetic flowmeter that measures and displays the flow rate of blood flowing from the channel opening/closing device 33 into the blood channel between living bodies. These pressure sensitive meters 36, 37 and flow meter 38 are for monitoring the blood pressure and flow rate supplied to the living body to ensure 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 34 to the solenoid 33 in synchronization with the heartbeat of the living body.
When the flow path is closed, the roller 32
a, 32a are continuously rotating, and blood is continuously flowing out, so blood is forced into the soft tube 31 between the channel opening/closing device 33 and the raceway 30, 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 31 is pulsatilely delivered to the blood circulation system of the living body. After this, the roller 32 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. 14 shows the pressure waveform and flow rate waveform obtained when operating the pulsatile flow pump having the above configuration in comparison with the waveform of the conventional pulsatile flow pump. The figure a on the left is the waveform of the conventional pulsatile flow pump, and the figure b on the right is the waveform of the pulsatile flow pump of the prior application. In addition, in the figure, the A curve is the pressure waveform in the soft tube 31 between the channel opening/closing device 33 and the raceway 30 measured by the pressure sensor 36, and the B curve is the pressure waveform from the channel opening/closing device 33 measured by the pressure sensor 37. The pressure waveform in the blood flow path between living bodies, the C curve, is the electromagnetic flowmeter 3.
The flow rate waveform measured in step 8, the D curve is the average flow rate waveform,
The E curve is a differential value of the pressure waveform shown by the B curve, that is, a curve showing the amount of pressure change per second of the pulsatile flow. As is clear from FIG. 14, the waveform of the conventional pulsatile flow pump shown in FIG. The waveform of the flow pump is smooth and very close to the arterial pressure waveform of a living body.

[Problems to be Solved by the Invention] As described above, the pulsatile flow pump provided prior to the present application has the excellent advantage of being able to easily obtain an arterial pressure waveform close to that of a living body. The present inventor has come to know that there are the following two problems to be solved in order to make this pulsatile flow pump more useful.

As is well known, the extracorporeal circulation circuit essential in the field of cardiac surgery consists of a blood pump and an artificial lung, and one of these blood pumps already uses the pulsatile flow pump. has been done.

However, the other oxygenator that makes up the extracorporeal circulation circuit currently on the market is not a pulsatile flow pump;
All are designed for continuous flow pumps and only require a blood flow rate of 6/min. The requirements for the connecting pipe used at the outlet of such a commercially available oxygenator are as follows:
The desired intra-arterial flow velocity is to be at least 9 mm/min, which cannot be met if the flow rate of the connected pulsatile flow pump is less than 6/min.

Therefore, in using the pulsatile flow pump of the earlier application, two roller pumps have been used so far, and the oxygenator currently provided so that these can be connected is used. The reality is that various structural improvements have been made to some parts of the building. With such a structure, it is difficult to control two pumps at the same time, and consideration must be given to safely returning blood to the patient.

The above is the first problem to be solved. continue,
The second issue will be explained.

Perfusion by pulsatile flow is considered to be physiologically the most suitable means of assisting the heart and ventricles. For purposes such as ventricular assist, the simplicity of a single roller pulsatile flow pump and the economic contribution of a single roller pulsatile flow pump in costly heart valve prosthesis are of great interest. Patients require mechanical ventricular support in the form of a pulsatile flow pump, which often requires support on both sides of the heart, ie, both the left and right ventricles. Here, assisting the right ventricle means assisting the blood supply to the lungs in a living body, and the first problem, blood supply to the artificial lung, refers to the relationship between the artificial lung and the living lung. There are only differences. In such cases, two pumps are used, but usually the right ventricle and left ventricle require separate outflow ports, and it is necessary to synchronize each with different flow rates. These are difficult to control. This is the second problem to be solved.

[Means for solving the problem] In response to the first problem, in the present invention,
A solution is sought by coaxially integrating the one-roller type pulsating flow pump of the prior application into a conventional blood pump (roller pump) having two or three rollers (first invention). In this case, each discharge flow rate can be changed by adjusting the length of each rotary arm and the length (diameter dimension) of the corresponding raceway. It is also adjusted depending on the diameter of each tube.

Furthermore, the second problem is solved in the present invention by coaxially integrating the two one-roller type pulsating flow pumps of the earlier application (second invention). In this case, each discharge flow rate can be changed by adjusting the length of each rotary arm and the length (diameter dimension) of the corresponding raceway. However, the raceway opening angles are the same. Moreover, each flow path opening/closing mechanism is configured to be controlled separately.

[Function] According to the first invention, the conventional roller pump (blood pump) can sufficiently supply the flow rate required for the connected artificial lung,
Furthermore, by using a one-roller type pulsatile flow pump that is driven in synchronization with this roller pump, it is possible to provide the patient with perfusion in a physiologically effective pulsatile flow state. As a result, even when an extracorporeal circulation circuit is constructed by combining it with a commercially available artificial lung, it is possible to achieve the purpose without making any special and unreasonable connections.

Further, according to the second invention, the one-roller pulsatile flow pump capable of supplying pulsatile flow effective for cardiac support can be synchronized by being integrated, and the flow rates of each can be easily adjusted. This makes it possible to provide a pulsatile flow pump that is very effective when both ventricles of the heart have to be assisted.

Examples of the present invention will be described below.

Embodiment 1 FIGS. 1 and 2 show an embodiment of the first invention of the present application, and this pulsatile flow pump is a conventional two-roller blood pump 40 and a one-roller pulsatile flow pump 41. It is characterized by an integrated structure with the shaft 42 being the same. 1 roller type pulsatile flow pump 41
is provided on the top of the two-roller blood pump 40.

As shown in the figure, the two-roller pump 40 includes a tube 44, a part of which is curved along the inner surface of a horseshoe-shaped raceway 43, through which blood flows, and a curved portion of the tube 44, which is rotated. Rollers 45b, 45 provided at both ends of arm 45a
The tube 44 is equipped with a rotating roller 45 that is handled by the tube 44 to send out the blood in the tube 44. The rotating roller 45 includes rollers 45b, 45b.
Adjust the protrusion distance from the rotating arm 45a by adjusting the knob 45.
c, 45c.

On the other hand, the pulsating flow pump 41 has a raceway 46 having a larger diameter than the raceway 43. A soft tube 47 is arranged along the inner peripheral surface of this raceway 46. This soft tube 47 has the same rubber hardness as above.
It is made of a rubber-like material with an angle of 70° or less, and as a result, it can withstand relatively high internal pressure through deformation, and the internal pressure remains approximately constant even if the pressing force changes. A rotating roller 48b attached to one end of a rotating arm 48a is in contact with the soft tube 47 so as to close the tube 47. In addition, this soft tube 4
A channel opening/closing mechanism 49 consisting of a push rod 49a and an occluder 49c opposed to this which is moved up and down by a solenoid 49b is provided on the outlet side of the flexible tube 49 so that the channel of the soft tube 49 can be opened and closed at will. It's getting old.

The protruding distance of the rotating roller 48b from the rotating arm 48a can be adjusted using a knob 48c. As shown in FIG. 2, reflecting plates 50 and 51 are attached to the lower part of the rotating shaft 42 at different height positions. The roles and functions of these reflectors 50 and 51 are the same as those of the prior application (FIG. 9).

According to the above configuration, the conventional two-roller pump 4
0, it is possible to sufficiently supply the flow rate required for the oxygenator connected to the blood pump,
Moreover, the roller pump 40 is driven synchronously with the roller pump 40.
The roller-type pulsatile flow pump 41 makes it possible to provide a physiologically effective pulsatile flow state of perfusion to the patient. As a result, even when an extracorporeal circulation circuit is constructed by combining it with a commercially available artificial lung, it is possible to achieve the purpose without making any special and unreasonable connections.

Embodiment 2 FIGS. 3 and 4 show a first embodiment of the second invention of the present application, and this pulsatile flow pump has the following features:
Two earlier patented one-roller pulsating flow pumps 50 and 51
It is characterized by an integrated structure with the shaft 52 being the same. One roller type pulsatile flow pump 51 is
It is provided above the other one-roller type blood pump 50.

One of the pulsatile flow pumps 50 has a raceway 53 whose length can be adjusted on its outlet side, and a soft tube 54 is arranged along the inner peripheral surface of the raceway 53. It is set up. This soft tube 54 is made of a rubber-like material with a rubber hardness of 70 degrees or less, as described above, and can withstand relatively high internal pressure through deformation, and even when the pressing force changes, the internal pressure remains constant. It has become almost constant. A rotating roller 55b attached to one end of a rotating arm 55a is attached to this soft tube 54.
are in contact with each other so as to block them. In addition, a push rod 56a is provided on the outlet side of the soft tube 54.
A channel opening/closing mechanism 56 is provided, which is composed of an occluder 56c that is moved up and down by a solenoid 56b, and can open and close the channel of the soft tube 54 as desired.

The protruding distance of the rotating roller 55b from the rotating arm 55a can be adjusted using a knob 55c.

The other pulsating flow pump 51 has a raceway 57 that is similar to the raceway 53 of the pulsating flow pump 50.
It has the same structure as the pulsating flow pump 50, except that the diameter is larger and the rotating arm 58a is longer than the rotating arm 55a of the pulsating flow pump 50. There is. That is, the raceway 57 is configured to be adjustable in length on its exit side, and a push rod 6 is provided on the exit side of the soft tube 59.
A channel opening/closing mechanism 60 is provided, which includes an occluder 60c and an occluder 60c opposed to the occluder 60c, which is moved up and down by a solenoid 60b, so that the channel of the flexible tube 59 can be opened and closed as desired. Note that the distance that the rotating roller 58b projects from the rotating arm 58a can be adjusted using a knob 58c.

Further, as shown in FIG. 4, at the bottom of the rotating shaft 52, there are reflector plates 61, each having a different height position.
62 and reflecting plates 63 and 64 are attached. These reflectors 61, 62 and reflector 6
The roles and functions of Nos. 3 and 64 are the same as those of the previous application (No. 9).

Embodiment 3 FIGS. 5 and 6 show a second embodiment of the second invention of the present application, and this pulsatile flow pump has the following features:
It is characterized by a structure in which the one-roller type pulsating flow pump of the earlier application shown in FIG. 12 is integrated with the shaft 70 being the same. a lower pulsatile flow pump 71;
The main differences from the upper pulsating flow pump 72 are that, as in the previous embodiment, the diameters of the raceways 73 and 74 are different, and the diameters of the respective rotary arms 75a and 76a are different.
The length dimensions of the two are different. In addition, as a structure for integrating these pulsating flow pumps 71 and 72 vertically and coaxially, cams 77 and 78 of the same shape and size are fixed at the upper and lower positions of the shaft 70, as shown in FIG. , Opposed to these cams 77 and 78, and to the right in these figures, are rotating rollers 79a at both ends of a U-shaped push member 79 that is movable in the horizontal direction.
79a is in contact with it. The push member 79
is normally biased to the left in the figure by a biasing member (not shown). At the upper and lower right positions of the push member 79, there are soft tubes 80 and 81, respectively.
There are installed occluders 82a and 83a which are driven by solenoids 82 and 83, respectively. The tip portions of the occluders 82a and 83a are configured to be horizontally adjustable.

In the above configuration, the push member 79 and the occluders 82a and 83a constitute a channel opening/closing mechanism 84.

Further, as shown in the figure, at the bottom of the rotating shaft 70, there are reflecting plates 85 and 86 at different height positions.
and reflective plates 87 and 88 are attached.
These reflective plates 85, 86 and 87, 8
The roles and functions of 8 are the same as those of the prior application (FIG. 9).

According to the configurations of the second and third embodiments, the one-roller pulsatile flow pumps 50, 51, 71, and 72, which can supply pulsatile flow effective for cardiac support, can be synchronized by being integrated. , the respective flow rates are easily adjustable, making it possible to provide a pulsatile flow pump that is very effective when both ventricles of the heart have to be assisted.

[Effects of the Invention] In the pulsatile flow pump of the first invention of the present application, all or part of the tube through which blood circulates is composed of a soft tube with a rubber hardness of 70° or less, and the outlet side of the soft tube A channel opening/closing device is provided to intermittently close the tube, and the tube is connected by a horseshoe-shaped raceway and a single rotating roller attached to an arm rotatably provided inside the raceway. A pulsatile flow pump that supplies pulsatile blood flow to the artery of a living body by discharging it in a compressed and closed state, and other tubes that allow blood to flow inside and have a rubber hardness of 70° or less, in whole or in part. The other horseshoe-shaped raceway is provided coaxially with the other horseshoe-shaped raceway, and a plurality of rotating rollers are attached to another arm rotatably provided inside the other raceway. A roller pump that sucks blood from the right atrium of the living body and supplies continuous blood flow to the pulsatile flow pump via the artificial lung by separating the tube in a compressed and closed state is provided so as to be rotatable together with each of the above. The feature is that the length of the raceway and each arm can be adjusted.

Further, in the pulsatile flow pump of the second invention of the present application, all or part of the tube through which blood circulates is constituted by a soft tube with a rubber hardness of 70° or less, and the tube is provided on the outlet side of the soft tube. A channel opening/closing device is provided that intermittently closes the tube, and the tube is pressed closed by a horseshoe-shaped raceway and a single rotating roller attached to an arm rotatably provided inside the raceway. A pulsatile flow pump that sucks blood from the right atrium of the living body and supplies the blood flow from the living body to the pulsatile lungs by separating The present invention is characterized in that it is provided so as to be integrally rotatable with another pulsatile flow pump that sucks the blood and supplies pulsatile blood flow to the artery of the living body, and the length of each raceway and each arm is adjustable. It is something.

According to the first invention, the conventional roller pump (blood pump) can sufficiently supply the flow rate required for the connected oxygenator,
Furthermore, by using a one-roller type pulsatile flow pump that is driven in synchronization with this roller pump, it is possible to provide the patient with perfusion in a physiologically effective pulsatile flow state. As a result, even when an extracorporeal circulation circuit is constructed by combining it with a commercially available artificial lung, it is possible to achieve the purpose without making any special and unreasonable connections.

Further, according to the second invention, the one-roller pulsatile flow pump capable of supplying pulsatile flow effective for cardiac support can be synchronized by being integrated, and the flow rates of each can be easily adjusted. This makes it possible to provide a pulsatile flow pump that is very effective when both ventricles of the heart have to be assisted.

[Brief explanation of the drawing]

1 and 2 are for explaining an embodiment of the first invention of the present invention, FIG. 1 is a plan configuration diagram of a pulsatile flow pump according to the present invention, and FIG. 2 is a plan view of the same pump. The side configuration diagram, FIGS. 3 and 4 are for explaining the first embodiment of the second invention of the present invention, and FIG. 3 is a plan configuration diagram of the pulsatile flow pump according to the present invention. , FIG. 4 is a side configuration diagram of the same pump, and FIGS. 5 and 6 are the second aspect of the second invention of the present invention.
Fig. 5 is a plan view of the pulsatile flow pump according to the present invention, Fig. 6 is a side view of the same pump, and Fig. 7 is a diagram of the conventional pulsatile flow pump. A schematic configuration diagram, FIG. 8 is a graph showing an arterial pressure waveform generated by a conventional pulsatile flow pump, FIG. 9 is a plan configuration diagram showing an example of a pulsatile flow pump filed prior to this application, and FIG. 10 is a graph showing the arterial pressure waveform generated with the pulsatile flow pump of the earlier application under the condition of opening angle θ ₁ = 50°, and Fig. 11 shows the arterial pressure waveform generated with the same pump under the condition of opening angle θ ₁ = 80°. FIG. 12 is a schematic diagram of another example of the prior application, and FIG. 13 is a plan view of an example of the pulsatile flow pump according to another invention filed prior to the present application. The configuration diagram and FIG. 14 are graphs showing pressure waveforms and flow rate waveforms obtained by the same pulsatile flow pump and waveforms with a conventional pulsatile flow pump. 40...2 roller type blood pump, 41,50,
51, 71, 72...1 roller type pulsatile flow pump,
42, 52, 70...axis, 43, 46, 53, 5
7, 73, 74... Raceway, 44, 47,
54, 59...Tube, 45a, 48a, 55
a, 58a, 75a...rotating arm, 45b, 4
8b, 55b...Roller, 49, 56, 60, 8
4... Channel opening/closing mechanism.

Claims (1)

[Scope of Claims] 1. All or part of the tube through which blood flows is composed of a soft tube with a rubber hardness of 70° or less, and a flow path that intermittently closes the tube on the outlet side of the soft tube. An opening/closing device is provided, and the tube is opened in a compressed state by a horseshoe-shaped raceway and a single rotating roller attached to an arm rotatably provided inside the raceway, thereby removing pulsating blood. A pulsatile flow pump that supplies blood to the artery of the living body, and another tube that allows blood to flow inside and has a rubber hardness of 70° or less, in whole or in part, is provided coaxially with the horseshoe raceway. By separating the other tube in a compressed state using another horseshoe-shaped raceway and a plurality of rotating rollers attached to another arm rotatably provided inside this other raceway, the living body is A roller pump that sucks blood from the right atrium of the patient and supplies continuous blood flow to the pulsatile flow pump via an artificial lung is provided so as to be rotatable together, and the length of each raceway and each arm can be adjusted. A pulsatile flow pump characterized by: 2 All or part of the tube through which blood circulates is composed of a soft tube with a rubber hardness of 70° or less, and a flow path opening/closing device is provided on the outlet side of this soft tube to intermittently close the tube, and this Blood is aspirated from the right atrium of the living body by separating the tube in a compressed state using a horseshoe-shaped raceway and a single rotating roller attached to an arm rotatably provided inside the raceway. a pulsatile flow pump that supplies pulsatile blood flow to the entire lungs; and a pulsatile flow pump that has a similar configuration to this pulsatile flow pump, which sucks blood from the left atrium of the living body and sends the pulsatile blood flow to the living body's arteries. A pulsating flow pump, characterized in that the pump is rotatable together with another pulsating flow pump, and the lengths of each raceway and each arm are adjustable.