JP7419933B2 - Balloon pumping drive device - Google Patents

Description

The present invention relates to a balloon pumping drive device, and more particularly to a medical balloon pumping drive device suitable for driving a circulatory system function assisting device using an auxiliary circulation method.

Medical balloon pumping drive devices, such as intra-aortic balloon pumping (hereinafter referred to as IABP) devices, are functional auxiliary devices that temporarily compensate for the decline or failure of the heart's pumping function in the treatment of circulatory system diseases. used for driving.

As a conventional balloon pumping drive device, for example, as shown in FIG. 11, a diaphragm 204 is installed between a gas pressure chamber 202 communicating with a balloon 201 and an air pressure chamber 203 into which positive pressure or negative pressure can be introduced. The compressor 206 generates positive pressure and negative pressure for pumping and driving the balloon 201 through the transmission partition means 205 and the pressure transmission partition means 205, and stores the pressure in the positive pressure tank 207 and the negative pressure tank 208. A device is known that includes a pressure applying means 210 that alternately applies pressure and negative pressure to the air pressure chamber 203 by switching electromagnetic valves 209A and 209B (for example, see Patent Document 1).

In addition, the central part of the diaphragm is fixed to a plate and the plate is moved by a ball screw mechanism to pump the balloon (for example, see Patent Document 2), and the gas pressure chamber communicating with the balloon is driven by bellows. It is also known that the balloon is pumped by moving the closed end of the bellows using a ball screw mechanism to expand and contract the bellows (see, for example, Patent Document 1, paragraph 0057 and FIG. 3). .

Japanese Patent Application Publication No. 9-173442 Japanese Patent Application Publication No. 3-280969

However, in the former conventional balloon pumping drive device in which positive pressure and negative pressure are generated using the compressor 206 and the positive pressure and negative pressure are switched by electromagnetic valves 209A and 209B, the positive pressure side is placed on the pressure applying means 210 side. Since it is necessary to provide tanks 207 and 208 on the negative pressure side, a compressor 206, electromagnetic valves 209A and 209B, etc., there is a problem that the device configuration becomes complicated.

In addition, in the conventional latter balloon pumping drive device that uses a motion conversion mechanism such as a ball screw mechanism that converts rotation to linear motion, due to the structure of the motion conversion mechanism, it is possible to obtain a large thrust force that drives the bellows to extend and contract. However, there was a problem in that it was not easy to cause the bellows to make a steep movement, and it was not possible to sufficiently meet the demand for high response.

On the other hand, it is possible to obtain high responsiveness that allows steep movements by configuring the pressure applying means using an electromagnetic linear motor, etc., but in that case, if a motion conversion mechanism is used The problem was that it was difficult to obtain sufficient thrust.

The present invention was made to solve the conventional unresolved problems as described above, and an object thereof is to provide a simple balloon pumping drive device having sufficient thrust and high responsiveness.

In order to achieve the above object, the balloon pumping drive device of the present invention includes a variable volume pressure vessel which forms a gas pressure chamber connected to the balloon and in which at least a part of the movable part can be displaced relative to the remaining fixed part. , a pumping drive mechanism that applies positive pressure and negative pressure to the gas in the gas pressure chamber via the movable part, the pumping drive mechanism sandwiching the pressure vessel. A plurality of linear actuators each having one output shaft and the other output shaft facing each other so as to be able to approach and separate from each other, and transmitting a driving operation force corresponding to the displacement of the one output shaft and the other output shaft to the movable part to increase the gas pressure. It is characterized by having a pressure transmission element that generates the positive pressure and negative pressure in the room.

With this configuration, in the present invention, depending on the displacement of one output shaft and the other output shaft of the actuator disposed on both sides of the pressure vessel, the drive operating force in the direction of approaching and separating the two output shafts is alternately transmitted via the pressure transmission element. This is transmitted to the movable part of the pressure vessel, and positive pressure and negative pressure are alternately generated within the gas pressure chamber. Therefore, the drive operation force for balloon pumping can be obtained based on the reciprocating thrust from one and the other output shaft of the actuator and the relative displacement of both output shafts, and sufficient thrust and high response for balloon pumping can be obtained. This is a simple balloon pumping drive device having a simple configuration.

In the present invention, it is preferable that the pressure transmission element is configured to cause the movable part to receive fluid pressure corresponding to the displacement of the one output shaft and the other output shaft as the driving operation force. In this way, the movable part of the pressure vessel can be constructed of a flexible or elastically deformable membrane, and the required driving force can be quickly and accurately transmitted to the movable part.

In the present invention, the pressure transmission element is interposed between the pressure vessel and the one and the other output shafts, and defines at least one operating pressure chamber containing the fluid. one end of the one and the other bellows is respectively coupled to the fixed part of the pressure vessel and closed by the pressure vessel, while the other end of the one and the other bellows is It may be configured such that each of the output shafts is closed and movably supported by the one and the other output shafts. In that case, the operating pressure chamber and the gas pressure chamber can be integrated by integrating the movable part with the bellows, or the gas pressure chamber and the operating pressure chamber can be installed inside and outside the diaphragm-like movable part, respectively. It is also possible to define.

In the present invention, the fixed part of the pressure vessel supports the movable part so as to be able to reciprocate, and the movable part of the pressure vessel supports the pressure of the fluid according to the displacement of the one and the other output shafts. It is also possible to have a configuration having a pressure receiving surface that receives pressure. That is, by configuring the movable part with a piston, a diaphragm, or the like, it is possible to form a variable volume gas pressure chamber within the pressure vessel.

In the present invention, the fixed part of the pressure vessel has an annular plate-shaped part at least on the gas pressure chamber side, and the movable part of the pressure vessel has both sides of the annular plate-shaped part of the fixed part. It is also possible to have one and the other diaphragm supported on each side. In this way, the volume of the gas pressure chamber on the secondary side communicating with the balloon can be suppressed as necessary and sufficient depending on the inner diameter and thickness of the annular plate-shaped portion, while the positive pressure and negative pressure in the operating pressure chamber on the primary side can be suppressed. It is possible to quickly and accurately transmit the pressure to the gas pressure chamber, and to continue applying sufficient positive pressure or negative pressure over the required contraction time and expansion time corresponding to heart beats, etc.

In the present invention, the plurality of linear actuators of the pumping drive mechanism are driven in accordance with a predetermined input signal so that the one and the other output shafts are driven in mutually opposite directions on the same axis, and the two output shafts approach and separate from each other. The structure may include a pumping control section that applies positive pressure and negative pressure to the gas in the gas pressure chamber via the movable section. In this case, the timing of expansion and deflation of the balloon can be accurately controlled in accordance with a predetermined input signal corresponding to an electrocardiogram waveform, an arterial pressure waveform, or the like.

The present invention further includes a position sensor that detects the position of at least one of the movable portion and the output shaft, and the pumping control unit detects the position of the plurality of positions based on the position detected by the position sensor. The linear actuator can be configured to perform feedback control. In this case, the operation of the balloon can be controlled while reducing vibrations.

Note that it is also conceivable that the fixed part of the pressure vessel is formed in a cylindrical shape, and the movable part of the pressure vessel is formed in a piston shape.

According to the present invention, it is possible to provide a simple balloon pumping drive device having sufficient thrust and high responsiveness for balloon pumping.

1 is an overall schematic view of a balloon pumping drive device and an intra-aortic balloon pumping catheter pumped and driven by the device according to a first embodiment of the present invention. 1 is a schematic configuration diagram of main parts of a balloon pumping drive device according to a first embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the pumping drive mechanism in the balloon pumping drive device according to the first embodiment of the present invention. (a) An explanatory diagram of the operation of a pair of opposing movable parts of the pumping drive mechanism in the balloon pumping drive device according to the first embodiment of the present invention, (b) is a reciprocating diagram of the movable plate in the pair of movable parts of the pumping drive mechanism It is a chart showing a change in movable position over time according to displacement. FIG. 4(b) is a chart showing a change over time in the movable position corresponding to the reciprocating displacement of the movable plates of the pair of movable parts in the balloon pumping drive device according to the first embodiment of the present invention. This figure shows deformation modes with different reciprocating displacement patterns. It is a flowchart which shows the procedure of the movement direction switching control of the output shaft for pumping drive in the balloon pumping drive device according to the first embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a working gas control system of a balloon pumping drive device according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of main parts of a balloon pumping drive device according to a second embodiment of the present invention. FIG. 7 is a schematic configuration diagram of main parts of a balloon pumping drive device according to a third embodiment of the present invention. FIG. 7 is a schematic configuration diagram of main parts of a balloon pumping drive device according to a fourth embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a conventional balloon pumping drive device.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
1 to 7 show the configuration of a balloon pumping drive device according to a first embodiment of the present invention, and the present invention is used for balloon pumping of an intra-aortic balloon pumping catheter (IABP (intra-aortic balloon pumping)). This example shows a case where

First, its configuration will be explained.

As shown in FIGS. 1 and 2, the balloon pumping drive device 10 of this embodiment forms a gas pressure chamber 11 connected to a balloon 1 of a predetermined volume of an intra-aortic balloon pumping catheter 2 (only the main part is shown). and a pumping drive mechanism 13 that can alternately apply a positive pressure higher than the external atmospheric pressure and a negative pressure lower than the external atmospheric pressure to the gas in the gas pressure chamber 11, for example, helium gas. ing.

As shown in FIG. 2, the pressure vessel 12 includes, for example, an annular fixed part 21 having at least an annular plate shape at the inner periphery, one movable part 22A and the other movable part 22A connected to both surfaces of the fixed part 21, 22B, and at least a part of each movable part 22A or 22B (hereinafter also simply referred to as movable part 22) is a variable-volume, sealable part that is displaced relative to the fixed part 21 on the remaining part side. It is a container. A communication hole 21 a is formed in the fixing part 21 to communicate with the inside of the balloon 1 .

The pumping drive mechanism 13 includes one and the other linear actuators 30A and 30B, which are arranged to be axially opposed to each other on the central axis C with the pressure vessel 12 in between, and each linear actuator 30A or 30B (hereinafter simply referred to as The linear actuator 30 is coupled to the pressure vessel 12 by coupling means (only one abutting portion is shown) 16A and 16B.

Moreover, one and the other linear actuators 30A and 30B have respective output shafts 31 that can approach and separate from each other on the central axis C with the pressure vessel 12 in between, and each linear actuator 30 has Positive pressure and negative pressure can be applied to the helium gas in the gas pressure chamber 11 of the pressure vessel 12 via the corresponding movable parts 22.

Specifically, each of the movable parts 22 includes a disc-shaped movable plate 23 having an outer diameter close to the inner diameter of the fixed part 21 of the pressure vessel 12, and a movable plate 23 having both ends connected to the movable plate 23 and the inner peripheral part of the fixed part 21. The bellows 24 are airtightly connected to each other in the vicinity.

The bellows 24 of the one and the other movable parts 22A, 22B are interposed between the fixed part 21 of the pressure vessel 12 and the output shafts 31 of the one and the other linear actuators 30A, 30B so as to be expandable and contractible. Both bellows 24 are connected to the fixed part 21 of the pressure vessel 12 at one end on the pressure vessel 12 side, and are closed by the movable plate 23 at the other end side of the bellows 24 at one end or the other via the movable plate 23. It is movably supported by an output shaft 31 of. This defines a gas pressure chamber 11 whose volume can be changed by expansion and contraction of both bellows 24.

This gas pressure chamber 11 accommodates helium gas (compressible fluid) and changes its volume through expansion and contraction, thereby changing the gas pressure and gas amount within the balloon 1. It has one operating pressure chamber.

Furthermore, the balloon pumping drive device 10 of this embodiment is provided with two position sensors 25A and 25B corresponding to the movable plates 23 (hereinafter also referred to as movable plates 23A and 23B) of the two movable parts 22A and 22B. It is being The position sensor 25A detects the axial position (displacement) of the movable plate 23A. The position sensor 25B detects the axial position (displacement) of the movable plate 23B. As will be explained in detail later, the position sensor 25A is used to feedback control the operation of the linear actuator 30A (details will be described later) based on the position of the movable plate 23A, and the position sensor 25B is used to control the operation of the linear actuator 30A based on the position of the movable plate 23A. is used to feedback control the operation of the linear actuator 30B based on the position of the linear actuator 30B.

One and the other linear actuators 30A, 30B have a disc-shaped movable plate 23 integrally coupled or integrally formed with the tip 31a of each output shaft 31, so that the linear actuators 30A and 30B respond to relative displacement of both output shafts 31. A pressure transmission element capable of transmitting the drive operating force to the corresponding movable part 22 and generating positive pressure and negative pressure in the gas pressure chamber 11 is integrally attached to the tip 31a of each output shaft 31. The structure is as follows.

As a result, the tips 31a (pressure transmission elements) of the output shafts 31 of the linear actuators 30A and 30B apply a drive operation force to each movable part 22 of the pressure vessel 12 in accordance with the relative displacement of the respective output shafts 31. It is meant to be transmitted .

As shown in FIGS. 2 and 3, each linear actuator 30 includes the aforementioned output shaft 31, a case 32 that accommodates the output shaft 31 so as to be able to reciprocate in the axial direction, and a case 32 located on the axial center side of the output shaft 31. A driving coil section 33 having an inner core 36 integrally attached and extending in the radial direction of the output shaft 31 and coils 37A and 37B wound around both ends of the inner core 36 and the output shaft 31 are reciprocated in the direction of displacement. A return leaf spring 38 that biases the output shaft 31 to a predetermined position in the axial direction, a bearing 39 that guides the output shaft 31 so as to be reciprocally displaceable in the axial direction, and a bearing 39 that is fixed in parallel to both ends of the substantially rectangular shape of the inner core 36 and is fixed to the output shaft A plurality of pairs of permanent magnets 41 and 42 each having a strip-shaped magnetic pole surface are provided inside and outside the shaft 31 in the radial direction.

Here, the inner core 36 has a bobbin shape that allows the output shaft 31 to pass through the central portion in the longitudinal direction and around which coils 37A and 37B can be wound respectively at both end sides in the longitudinal direction, and has a plurality of laminated magnetic plates. It has become a thing.

The case 32 also has a substantially U-shape that sandwiches the drive coil portion 33 from both sides in the radial direction of the output shaft 31, and a pair of outer cores 45 that face each other so that both ends are close to the inner core 36; One cover case 46 integrally holds the outer core 45 from the rear end side of the output shaft 31 and the other cover supports the return leaf spring 38. It has a case 47 and an end cover 48 that covers the back side of the return leaf spring 38.

Each outer core 45 is made by laminating a plurality of approximately U-shaped magnetic plates, and has a predetermined gap between one and the other permanent magnets 41 and 42 corresponding to the inner back side of the approximately U-shape. It has protrusions 45a that are adjacent to each other with a distance between them.

Further, one of the plurality of pairs of permanent magnets 41 and 42 has an N pole on the radially inner side of the output shaft 31 and an S pole on the radially outer side of the output shaft 31, respectively. The other permanent magnet 42 of the plurality of pairs of permanent magnets 41 and 42 has an N pole on the radially outer side of the output shaft 31 and an S pole on the radially inner side of the output shaft 31, respectively. There is. Both of the permanent magnets 41 and 42 may be made by bonding a pair of magnetic pole plates.

Note that in FIGS. 2 and 3, the output shaft 31 is shown thick for convenience of illustration, but each linear actuator 30 specifically has a configuration as described in, for example, Japanese Patent Application Laid-Open No. 2013-121275. The inner core 36 side is lightweight.

In such a linear actuator 30, when the coils 37A and 37B are not energized, the output shaft 31 is set at a neutral position, which is a predetermined position in the axial direction, by the return leaf spring 38, as shown in FIG. 3(a), for example. At the same time, the output shaft 31 can come to rest with respect to the case 32 due to the detent force in a state where the magnetic forces of the plurality of pairs of permanent magnets 41 and 42 are balanced at the neutral position.

When each coil 37A, 37B is energized in a predetermined direction, the magnetic flux generated by the excitation of the coils 37A, 37B causes the magnetic flux to move in the same direction as the magnetization direction of one of the plurality of permanent magnets 41, 42. The magnetic force increases, and the output shaft 31 and the drive coil section 33 move toward the tip 31a of the output shaft 31, as shown in FIG. 3(b), for example.

When the direction of energization to each coil 37A, 37B is switched, the magnetic flux due to the excitation of the coils 37A, 37B is reversed, and the direction of magnetization is the same as that of the other permanent magnet 42 or 41 among the plurality of permanent magnets 41, 42. The magnetic force increases, and the output shaft 31 and the drive coil portion 33 move toward the rear end of the output shaft 31, as shown in FIG. 3(c), for example.

The coils 37A, 37B of the drive coil unit 33 are synchronously driven by a pumping control unit 50, which is a control means, so that the output shafts 31 of one and the other linear actuators 30A, 30B are displaced in opposite directions in synchronization with each other. It looks like this.

As shown in FIG. 2, the pumping control unit 50 operates the plurality of linear actuators 30A based on input signals such as the blood pressure fluctuation signal Pvs from the blood pressure fluctuation measuring device 71 and the electrocardiographic waveform signal Pts from the electrocardiographic measuring device 72. , 30B, and drive one and the other output shafts 31 in mutually opposite directions on the same axis, and as the two output shafts 31 approach and separate, the gas pressure chamber 11 It is now possible to apply positive and negative pressure to the helium gas inside.

The pumping control unit 50 is also provided with a storage unit 50a in which a predetermined control program and set value information are stored in advance, and the pumping control unit 50 controls electrocardiographic waveforms and arterial pressure waveforms according to the control program. A predetermined signal change is detected as a trigger (for example, an electrocardiogram trigger), a target drive pressure that fluctuates at a cycle corresponding to the detection cycle of the trigger is sequentially calculated, and a change in the gas pressure chamber 11 corresponding to the change in the target drive pressure is performed. One and the other linear actuators 30A and 30B are operated to cause a pressure change, that is, a displacement of the movable plates 23 (hereinafter also referred to as movable plates 23A and 23B) of the movable parts 22A and 22B. .

Then, the pumping control unit 50 applies positive pressure and negative pressure to the helium gas in the gas pressure chamber 11 at a predetermined timing and time by operating the one and other linear actuators 30A and 30B, thereby causing cardiac expansion. Balloon 1 is inflated at the same time as the aortic valve closes at the beginning of the diastolic period to produce a diastolic augmentation effect (increase in coronary artery blood flow and maintain mean aortic pressure), and the timing when the end-diastolic arterial pressure reaches its lowest value. By deflating the balloon 1, it is possible to achieve a systolic unloading effect (reducing cardiac workload and suppressing myocardial oxygen consumption by lowering blood pressure at end-diastole and systole).

The pumping control unit 50 also controls the operation of the linear actuator 30A based on the position of the movable plate 23A detected by the position sensor 25A, and controls the operation of the linear actuator 30A based on the position of the movable plate 23B detected by the position sensor 25B. The operation of the actuator 30B is controlled. FIG. 4 is a diagram for explaining the operation of the linear actuators 30A and 30B, in which (a) is a schematic diagram showing each pumping drive mechanism 13, and (b) is a schematic diagram showing each output shaft 31. It is a graph which shows the position of a pair of movable plates 23A and 23B which are reciprocated by the operation|movement of. As shown in FIG. 4(a), the center Cn of the gas pressure chamber 11 in the axial direction is defined as the origin, the right side from the center Cn is defined as the +X direction, and the left side from the center Cn is defined as the -X direction.

In the pumping drive mechanism 13, positive pressure and negative pressure are applied to the helium gas in the gas pressure chamber 11 by reciprocating the movable plates 23A and 23B in the axial direction by the output shafts 31 of the linear actuators 30A and 30B. At this time, vibration occurs due to the reaction force accompanying the reciprocating movement of the movable plates 23A, 23B and the output shaft 31. Therefore, as shown in FIG. 4(b), the moving amount of the movable plate 23A and the moving amount of the movable plate 23B are equal and the moving directions are opposite, that is, the time of the moving speed of the movable plates 23A and 23B is The linear actuators 30A and 30B are feedback-controlled in accordance with the period of the target drive pressure described above so that the amount of change is the same and the direction of displacement is opposite. The resultant vector of reaction forces associated with movement is canceled out, making it possible to reduce vibration. In FIG. 4(b), a case is shown in which feedback control is performed by periodically varying the moving amount A2 of the movable plate 23A and the moving amount B2 of the movable plate 23B while keeping them equal, but as shown in FIG. The amount of movement may be changed at any time according to a control signal from the control unit 50 or the like.

In addition, in the balloon pumping drive device 10 of this embodiment, the center Cn of the gas pressure chamber 11 is used as the reference position of the movable plates 23A, 23B, and the position information of the movable plates 23A, 23B from the center Cn and the above-mentioned trigger input cycle are used. By controlling the linear actuators 30A and 30B based on this, the pressure inside the gas pressure chamber 11 can be controlled while reducing vibration. Specifically, the mutually opposite displacements (+X, -X) of the movable plates 23A and 23B from the center Cn of the gas pressure chamber 11 shown in FIG. 4(a) are changed as shown in FIG. 4(b). Assuming that the movable positions are A and B, and the distances from the center Cn to the minimum positions Amin and Bmin are the respective position offset amounts A1 and B1, in addition to the fact that the position offset amounts A1 and B1 are equal, the movement amount A2 of the movable plate 23A is By performing feedback control to synchronize the linear actuators 30A and 30B so that the moving amount B2 of the movable plate 23B is the same and the moving direction is opposite, the movable plate 23A is , 23B and the output shaft 31 to reduce vibrations, while controlling pressure fluctuations in the gas pressure chamber 11 based on the movable positions A and B of the movable plates 23A and 23B. Accordingly, the operation of the balloon 1 can be controlled.

Next, a procedure for controlling switching of the drive directions of the linear actuators 30A and 30B executed by the pumping control unit 50 will be described based on the flowchart shown in FIG. 6. Since the control performed on the linear actuators 30A and 30B is almost the same, only the control on the linear actuator 30A will be explained here, but the same driving direction will be applied to the linear actuator 30B based on the movable position B. Switching control is executed. First, the movable position A of the linear actuator 30A (the position of the movable plate 23A) is detected by the position sensor 25A (step S11), and the movable position A is specified based on the detected position. Next, it is determined whether the moving direction of the output shaft 31 of the linear actuator 30A is the -X direction or the +X direction (step S12). If the moving direction of the output shaft 31 is the +X direction (YES in step S12), it is determined whether the movable position A matches the minimum position Amin (step S13). If the movable position A matches the minimum position Amin (YES in step S13), the linear actuator 30A is controlled to switch the moving direction of the output shaft 31 from the +X direction to the -X direction (step S14). If the position of the movable plate 23A does not match the minimum position Amin (NO in step S13), the linear actuator 30A is controlled to maintain the moving direction of the output shaft 31 in the +X direction (step S15).

If the moving direction of the output shaft 31 is in the -X direction in step S12 (NO in step S12), it is determined whether the movable position A matches the maximum position Amax (step S16). If the movable position A matches the maximum position Amax (YES in step S16), the linear actuator 30A is controlled to switch the moving direction of the output shaft 31 from the -X direction to the +X direction (step S17). If the position of the movable plate 23A does not match the maximum position Amax (NO in step S16), the linear actuator 30A is controlled to maintain the moving direction of the output shaft 31 in the -X direction (step S18).

By performing output control as shown in steps S11 to S18 for each of the linear actuators 30A and 30B, as shown in FIGS. 4(b) and 5, movable positions A and B are controlled by gas pressure The absolute value with the center Cn of the chamber 11 as the reference position corresponds to the equivalent output shaft displacement. For example, the linear actuators 30A, 30B output according to the deviation between the target values of the movable positions A, B corresponding to the aforementioned target driving pressure and the detected values of the movable positions A, B fed back from the position sensors 25A, 25B. By controlling the axial displacement, it is possible to control the pressure within the gas pressure chamber 11 while reducing vibrations, thereby controlling the operation of the balloon 1.

As shown in FIG. 7, a gas pressure chamber 11 communicating with the inside of the balloon 1 has a predetermined pressure supplied from a gas supply source 51 to a gas tank 54 via a relief valve 52 with a pilot and a first electromagnetic switching valve 53. Helium gas is supplied according to the opening and closing of the second electromagnetic switching valve 55.

Further, a secondary piping system that communicates with the gas pressure chamber 11 via the balloon 1 houses a thermoelectric element, such as a Peltier element 56, that cools and condenses moisture that seeps in, and also removes the moisture from the gas pressure chamber 11. A purge valve 57 is connected which opens when necessary to discharge water.

Furthermore, a pressure sensor 58 that detects the pressure inside the gas pressure chamber 11 is attached to the pressure vessel 12, and also prevents leakage (leakage for exhaust gas recovery) into the secondary piping system via an impurity removal filter (not shown) or the like. An exhaust valve 59 is connected to generate the exhaust gas. When the pressure inside the balloon 1 exceeds a predetermined pressure, the exhaust valve 59 is opened to reduce the required amount of pressure due to leakage.

The first electromagnetic switching valve 53 and the second electromagnetic switching valve 55 that control the supply of helium gas into the gas pressure chamber 11 operate based on pressure information from the pressure sensor 61 that detects the pressure inside the gas tank 54. The opening/closing is controlled by 60.

The replenishment control unit 60 operates the first electromagnetic switching valve 53, the second electromagnetic switching valve 55, and the exhaust valve 59 based on pressure information from the pressure sensors 58 and 61 according to a replenishment control program stored in a built-in storage means. By controlling the opening and closing, it is possible to perform the initial filling of helium gas in the secondary piping system and the replacement of helium gas after a predetermined period of time.

In this way, in this embodiment, the gas pressure chamber 11 connected to the balloon 1 is formed, and at least a part of the movable part 22 is a variable volume pressure vessel 12 that can be relatively displaced with respect to the remaining fixed part 21. , and a pumping drive mechanism 13 that applies positive pressure and negative pressure to helium gas in the gas pressure chamber 11 via a movable part 22. The pumping drive mechanism 13 includes a plurality of linear actuators 30A and 30B each having one and the other output shafts 31 which are arranged opposite to each other so as to be able to approach and separate from each other across the pressure vessel 12, and one and the other output shafts 31. The movable plate 23 includes a tip portion 31a and a movable plate 23 as a pressure transmitting element that transmits a driving operation force corresponding to the displacement of the movable portion 22 to the movable portion 22 to generate positive pressure and negative pressure within the gas pressure chamber 11.

Further, the tip end 31a of the output shaft 31 and the movable plate 23 integrated therewith serve as a pressure transmission element capable of transmitting a drive operation force corresponding to the displacement of one and the other output shafts 31 to the movable part 22. The pressure transmission element is interposed between the pressure vessel 12 and one and the other output shafts 31, and has the same operating pressure as in the gas pressure chamber 11 containing a predetermined fluid, for example, helium gas. It has one and the other bellows 24 defining a chamber. One end of each bellows 24 is connected to the fixed part 21 of the pressure vessel 12 and closed by the pressure vessel, while the other end of both bellows 24 is closed and movable by one and the other output shafts 31. is supported by

Furthermore, in this embodiment, the fixed part 21 of the pressure vessel 12 has a movable part 22 that supports the movable plate 23 reciprocally through the bellows 24, and the movable part 22 has one output and the other output. The movable plate 23 has a pressure receiving surface 23a that receives the pressure of helium gas (fluid) in the gas pressure chamber 11 according to the displacement of the shaft 31.

Next, the effect will be explained.

In the balloon pumping drive device of this embodiment configured as described above, the pressure transmission element is Via the tip portion 31a and the movable plate 23, the drive operating forces of both output shafts 31 in the approaching and separating directions are alternately transmitted to the movable portion 22 of the pressure vessel 12, and positive pressure and negative pressure are alternately generated in the gas pressure chamber 11. occurs in Therefore, the drive operation force for balloon pumping based on the reciprocating thrust from the output shafts 31 of the linear actuators 30A, 30B and the relative displacement of both output shafts 31 can be quickly and accurately obtained, and sufficient power for balloon pumping can be obtained. The device has thrust and high responsiveness.

Further, in this embodiment, one and the other bellows 24 are interposed between the pressure vessel 12 and the one and the other output shafts 31, and at least one operating pressure chamber containing operating fluid is provided. Since it is formed integrally with the gas pressure chamber 11, the configuration is extremely simple.

Further, in this embodiment, one end of the one and the other bellows 24 is respectively coupled to the fixing part 21 of the pressure vessel 12 and closed by the pressure vessel 12, while the other end of the one and the other bellows 24 is While being closed, it is movably supported by one and the other output shafts 31, and the movable portion 22 is integrated with the bellows 24. Therefore, various operations for quickly and accurately changing the volume and pressure of the gas pressure chamber 11 are possible.

In addition, in this embodiment, the pumping control unit 50 controls the plurality of linear actuators 30A and 30B of the pumping drive mechanism 13, drives one and the other output shafts 31 in mutually opposite directions on the same axis, and both output shafts 31 are driven in mutually opposite directions on the same axis. By applying a positive pressure and a negative pressure to the helium gas in the gas pressure chamber 11 by moving the shaft 31 toward and away from the shaft 31, the balloon 1 can be expanded and expanded in accordance with a predetermined input signal corresponding to an electrocardiogram waveform, an arterial pressure waveform, etc. The contraction timing can be accurately controlled.

Furthermore, in this embodiment, position sensors 25A and 25B are provided to detect the axial positions of the movable parts 22A and 22B, and the pumping control unit 50 causes the pumping control unit 50 to follow the target drive pressure change based on the aforementioned trigger input signal. By configuring the plurality of linear actuators 30A and 30B to be feedback-controlled based on the positions detected by the position sensors 25A and 25B, the operation of the balloon 1 can be controlled while reducing vibrations.

(Second embodiment)
FIG. 8 shows a main part configuration of a balloon pumping drive device according to a second embodiment of the present invention. Note that the configurations of the gas supply system, replenishment control system, etc. in each of the following embodiments are similar to those of the first embodiment, so the differences between each embodiment and the first embodiment will be mainly explained below. do.

As shown in FIG. 8, the balloon pumping drive device 80 of this embodiment includes a pressure vessel 82 forming a gas pressure chamber 81 connected to a balloon 1 of a predetermined volume, and a gas in the gas pressure chamber 81, such as helium gas. A pumping drive mechanism 13 is provided which can alternately apply a positive pressure higher than the external atmospheric pressure and a negative pressure lower than the external atmospheric pressure to the external atmospheric pressure.

As shown in the figure, in the second embodiment, the movable part is not integrated with the bellows 24 to integrate the operation pressure chamber and the gas pressure chamber 11 as in the first embodiment, but a diaphragm-shaped movable part is used. A gas pressure chamber and an operating fluid pressure chamber are separately defined inside and outside the chamber.

That is, the pressure vessel 82 first includes an annular fixing part 91 whose inner periphery is in the shape of an annular plate, and one and the other diaphragms 92A each made of an elastic membrane material coupled to both surfaces of the fixing part 91. , 92B (movable part) define a substantially disk-shaped gas pressure chamber 81 having a predetermined volume corresponding to the inner diameter and thickness of the fixed part 91 when the pumping drive mechanism 13 is inactive. There is.

Further, on both sides of the fixed part 91, operating movable parts 96A and 96B (pressure transmission elements) similar to the one and the other movable parts 22A and 22B of the first embodiment are attached. A pair of variable volume operation pressure chambers 83A, 83B are formed on both sides of the gas pressure chamber 81 by the diaphragms 92A, 92B and one and the other movable operation parts 96A, 96B (hereinafter also simply referred to as the operation movable parts 96). is defined.

The other configurations are the same as those in the first embodiment.

In this embodiment as well, similarly to the first embodiment, it is possible to provide a simple balloon pumping drive device having a sufficient thrust force and high responsiveness for balloon pumping.

In addition, in this embodiment, the operation movable parts 96A and 96B are configured to cause the diaphragms 92A and 92B to receive the pressure of the fluid corresponding to the displacement of one and the other output shafts 31 as driving operation force. While the movable part of the container 82 is configured with diaphragms 92A and 92B, which are flexible or elastically deformable membrane bodies, the required driving force from the pumping drive mechanism 13 can be quickly and accurately transmitted to the movable part. Become.

Furthermore, the volume of the gas pressure chamber 81 can be kept small, and the volume of the gas pressure chamber 81 can be easily changed due to the shape of the fixing part 91 to which the diaphragms 92A and 92B are attached, making gas filling and replacement easier. can be achieved.

In addition, in this embodiment, the fixed part 91 of the pressure vessel 82 supports the diaphragms 92A and 92B, which are movable parts, so as to be able to reciprocate, and each diaphragm 92A or 92B can control the displacement of one and the other output shaft 31. It has a movable pressure receiving surface 92e that receives fluid pressure according to the pressure. Therefore, each diaphragm 92A, 92B can be deformed according to the pressure difference between the operating pressure in the operating pressure chambers 83A, 83B and the internal pressure of the gas pressure chamber 81. As a result, the volume of the gas pressure chamber 81 on the secondary side communicating with the balloon 1 is suppressed as necessary and sufficient according to the inner diameter and plate thickness of the fixed part 91 (annular plate-shaped part) of the pressure vessel 82, while the volume of the gas pressure chamber 81 on the primary side The positive pressure and negative pressure in the operation pressure chambers 83A and 83B for drive operation are quickly and accurately transmitted to the gas pressure chamber 81, and the necessary contraction and expansion times corresponding to heart beats, etc. Sufficient positive pressure or negative pressure can be continuously applied.

(Third embodiment)
FIG. 9 shows the main part configuration of a balloon pumping drive device according to a third embodiment of the present invention.

As shown in FIG. 9, the balloon pumping drive device 110 of this embodiment includes a variable volume pressure vessel 112 that forms a gas pressure chamber 111 connected to a balloon 1 of a predetermined volume, and a A pumping drive mechanism 13 that can alternately apply positive pressure and negative pressure is provided.

As shown in the figure, in the third embodiment, a pressure vessel 112 includes an annular plate-shaped fixing part 121 and a cylinder 122 integrated therewith, which are slidably accommodated in the cylinder 122 and face each other. It is composed of a pair of pistons 123A and 123B.

Further, the pair of pistons 123A and 123B may have a flat fixed pressure receiving surface 123e like the piston 123B shown in the lower half of FIG. A diaphragm 123d may be attached to the opening edge of a concave piston head main body 123h like the piston 123A, so that the diaphragm 123d can be deformed in response to a change in the internal pressure of the gas pressure chamber 111 above a certain level.

In the former case, the piston 123B serves as the movable part according to the present invention, and in the latter case, the piston 123A and its diaphragm 123d serve as the movable part.

In this embodiment as well, similarly to the first embodiment, it is possible to provide a simple balloon pumping drive device having a sufficient thrust force and high responsiveness for balloon pumping.

Further, in this embodiment, the fixed part 121 of the pressure vessel 112 is formed in a cylindrical shape, and the movable part of the pressure vessel 112 is composed of pistons 123A and 123B, so that the responsiveness of the operating pressure can be improved. I can do it.

(Fourth embodiment)
FIG. 10 shows the main part configuration of a balloon pumping drive device according to a fourth embodiment of the present invention.

As shown in FIG. 10, the balloon pumping drive device 130 of this embodiment includes a variable volume pressure vessel 132 forming a gas pressure chamber 131 connected to a balloon 1 of a predetermined volume, and a A pumping drive mechanism 13 that can alternately apply positive pressure and negative pressure is provided.

As shown in the figure, in the present embodiment, the pressure vessel 132 includes a fixing part 141 having an annular plate shape and an annular plate-shaped inner circumferential part, and a plurality of fixing parts connected to both sides of the fixing part 141. One and the other diaphragms 142A and 142B (movable parts) made of an elastic membrane material generate a substantially disc-shaped gas pressure of a predetermined volume corresponding to the inner diameter and thickness of the fixed part 141 when the pumping drive mechanism 13 is inactive. A chamber 131 is defined.

Furthermore, movable parts 146A and 146B (pressure transmission elements) for operation of one and the other are attached to both sides of the fixed part 141, and diaphragms 142A and 142B (movable part) of one and the other are connected to each other. A pair of variable volume operation pressure chambers 133A, 133B are defined on both sides of the gas pressure chamber 131 by the operation movable parts 146A, 146B.

Here, the operating movable parts 146A, 146B are constituted by a cylinder 147 that is integrated with the fixed part 141, and a pair of pistons 143A, 143B that are slidably housed in the cylinder 147 and face each other.

In this embodiment as well, similarly to the first embodiment, it is possible to provide a simple balloon pumping drive device having a sufficient thrust force and high responsiveness for balloon pumping.

Further, in this embodiment, the fixed part 141 and the cylinder 147 of the pressure vessel 132 are formed in a cylindrical shape, and the movable part of the pressure vessel 132 is composed of the diaphragms 142A and 142B. , can be deformed according to the pressure difference between the operating pressure in the pair of operating pressure chambers 133A and 133B and the internal pressure of the gas pressure chamber 131. As a result, the volume of the gas pressure chamber 131 on the secondary side communicating with the balloon 1 is suppressed as necessary and sufficient according to the inner diameter and plate thickness of the fixed part 141 (annular plate-shaped part) of the pressure vessel 132, while the volume of the gas pressure chamber 131 on the primary side The positive pressure and negative pressure in the operating pressure chambers 133A and 133B for drive operation are quickly and accurately transmitted to the gas pressure chamber 131, and the pressure is maintained over the required contraction and expansion times corresponding to heart beats, etc. Sufficient positive pressure or negative pressure can be continuously applied.

Note that the configuration of the linear actuator is not limited to the specific configurations exemplified in each of the above-described embodiments. For example, it is conceivable to move the output shaft in a linear manner using a combination of a motion conversion mechanism (for example, a rack and pinion) and a rotary actuator. That is, the linear actuator referred to herein may be one in which the output shaft makes reciprocating linear motion in the axial direction. However, it is preferable to use one that is suitable for miniaturization.

Furthermore, in each of the above-described embodiments, the two position sensors 25A and 25B detect the positions of the movable plates 23A and 23B of the two movable parts 22A and 22B. A device for detecting the position may be provided, and the linear actuators 30A and 30B may be feedback-controlled based on the detected position.

Furthermore, in each of the above-described embodiments, two permanent magnets each having a pair of strip-shaped magnetic pole surfaces are arranged on both end surfaces of the inner core 36 in each drive coil section 33 of the pair of linear actuators 30A, 30B. However, the magnetic pole surfaces that are adjacent to each other in the reciprocating direction are not two, N and S poles, but three pole surfaces of N, S, and N poles, or three pole surfaces of S, N, and S poles. More magnetic pole surfaces may be arranged in parallel in the reciprocating direction.

Further, in each of the above-described embodiments, the pair of linear actuators 30A and 30B are configured as so-called moving coil type linear actuators, but they may be configured with other types of linear actuators, for example, so-called A moving magnet type linear actuator or a so-called moving iron core type linear actuator can be used.

It goes without saying that the presence or absence, shape, number of arrangement, etc. of the return leaf spring 38, bearing 39, etc. are arbitrary. Furthermore, it goes without saying that a hollow rubber-like elastic body in the form of a cylinder or a sphere can be used instead of the bellows.

As explained above, the present invention can provide a simple balloon pumping drive device having sufficient thrust and high responsiveness for balloon pumping, and can improve the cardiovascular system by using an auxiliary circulation method. It is useful for all medical balloon pump drive devices suitable for driving functional auxiliary devices.

1 Balloon 10, 80, 110, 130 Balloon pumping drive device 11, 81, 111, 131 Gas pressure chamber 12, 82, 112, 132 Pressure vessel 13 Pumping drive mechanism 21, 91, 121, 141 Fixed part 22, 22A, 22B Movable part 23 Movable plate 23a, 92e, 123e Pressure receiving surface 24 Bellows 25A, 25B Position sensor 30, 30A, 30B Linear actuator 31 Output shaft 31a Tip part (pressure transmission element)
33 Drive coil section 36 Inner core 37A, 37B Coil 41, 42 Permanent magnet 45 Outer core 45a Projection section 50 Pumping control section 51 Gas supply source 53 First electromagnetic switching valve 55 Second electromagnetic switching valve 56 Peltier element (thermoelectric element)
58, 61 Pressure sensor 60 Replenishment control unit 71 Blood pressure fluctuation measuring device 72 Electrocardiogram measuring device 83A, 83B, 133A, 133B Operation pressure chamber 92A, 92B, 123d, 142A, 142B Diaphragm 96, 96A, 96B, 146A, 146B For operation Movable parts 122, 147 Cylinder 123A, 123B, 143A, 143B Piston Ms1, Ms2 Drive control signal Pvs Blood pressure fluctuation signal Pts Electrocardiographic waveform signal

Claims (6)

a variable volume pressure vessel that forms a gas pressure chamber connected to the balloon and in which at least a part of the movable part is movable relative to the remaining fixed part;
A balloon pumping drive device comprising: a pumping drive mechanism that applies positive pressure and negative pressure to helium gas in the gas pressure chamber via the movable part,
The pumping drive mechanism includes a plurality of linear actuators having one and the other output shafts that are arranged opposite to each other so as to be able to approach and separate from each other with the pressure vessel in between, and the pumping drive mechanism has a plurality of linear actuators that have one and the other output shafts that are arranged opposite to each other so as to be able to approach and separate from each other, and the pumping drive mechanism has a plurality of linear actuators that are arranged to face each other so as to be able to approach and separate from each other with the pressure vessel in between. A balloon pumping drive device, characterized in that the drive operation force is transmitted to the movable part to generate the positive pressure and negative pressure in the gas pressure chamber. The balloon according to claim 1 , wherein the pumping drive mechanism includes a pressure transmission element that causes the movable part to receive fluid pressure according to the displacement of the one output shaft and the other output shaft as the drive operation force. Pumping drive. One and the other bellows are interposed between the pressure vessel and the one and the other output shafts and define at least one operating pressure chamber as the gas pressure chamber containing the helium gas . has,
One ends of the one and the other bellows are respectively coupled to the fixing part of the pressure vessel and closed by the pressure vessel, while other ends of the one and the other bellows are respectively closed and the one and the other bellows are closed. The balloon pumping drive device according to claim 1 , wherein the balloon pumping drive device is movably supported by an output shaft. The fixed part of the pressure vessel has an annular plate-shaped part at least on the gas pressure chamber side, and the movable part of the pressure vessel is supported on both sides of the annular plate-shaped part of the fixed part. 2. The balloon pumping drive device of claim 1, further comprising one diaphragm and one diaphragm. In accordance with a predetermined input signal, the plurality of linear actuators of the pumping drive mechanism drive the one and the other output shafts on the same axis in mutually opposite directions, and as the two output shafts approach and separate from each other, the pressure inside the gas pressure chamber increases. The balloon pumping drive device according to any one of claims 1 to 4 , further comprising a pumping control section that applies positive pressure and negative pressure to the helium gas via the movable section. further comprising a position sensor that detects the position of at least one of the movable part and the output shaft,
The balloon pumping drive device according to claim 5 , wherein the pumping control section performs feedback control of the plurality of linear actuators based on the position detected by the position sensor.