A piston-type ventricular assist device

Abstract

The present invention relates to the field of medical device technology, specifically a piston-type ventricular assist device. The present invention solves the problems of existing ventricular assist devices that are prone to hemolysis, have poor working stability, and cause a large economic burden on patients. A piston-type ventricular assist device comprises a circular cup-shaped shell; the inner cavity of the circular cup-shaped shell is provided with a circular turntable; the side wall of the circular cup-shaped shell is provided with a connecting hole A; the connecting hole A is sealed and docked with a circular tubular graphite sleeve; the inner cavity of the circular tubular graphite sleeve is coaxially provided with a cylindrical piston, a circular tubular elastic membrane sleeve, and a reset spring B; the front end face of the cylindrical piston contacts the side of the circular turntable; the side wall of the circular cup-shaped plug is provided with a liquid extraction hole and a liquid delivery hole arranged side by side; the outer end orifice edge of the liquid extraction hole is extended with a liquid extraction convex tube; the outer end orifice edge of the liquid delivery hole is extended with a liquid delivery convex tube. The present invention is suitable for ventricular assistance.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a piston-type ventricular assist device. Background Art

[0002] A ventricular assist device is a mechanical device that replaces or assists the heart in supplying blood to the aorta. It is used for patients with heart failure or awaiting a heart transplant. Currently, ventricular assist devices are mainly divided into two categories: one is an axial flow interventional pump, and the other is an external magnetic levitation ventricular assist pump. Both types of ventricular assist devices use high-speed rotating impellers to pump blood. The problem caused by this is that during the pumping process, the high-speed rotating impeller will cause shear damage to the blood, which can easily lead to hemolysis. In addition, the external magnetic levitation ventricular assist pump is limited by magnetic levitation technology. On the one hand, it is easily affected by external motion and electromagnetic interference. On the other hand, the cost is high. Therefore, on the one hand, its working stability is poor, and on the other hand, it imposes a heavy economic burden on patients. Based on this, it is necessary to invent a piston-type ventricular assist device to solve the problems of existing ventricular assist devices that are prone to hemolysis, have poor working stability, and impose a heavy economic burden on patients. Summary of the Invention

[0003] In order to solve the problems of existing ventricular assist devices that are prone to hemolysis, have poor working stability, and cause a heavy economic burden on patients, the present invention provides a piston-type ventricular assist device.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] A piston-type ventricular assist device includes a round cup-shaped housing;

[0006] The cup mouth of the circular cup-shaped shell is sealed with a circular cup-shaped end cover; a center hole is respectively opened in the center of the end wall of the circular cup-shaped shell and the center of the end wall of the circular cup-shaped end cover, and a convex ring is respectively extended from the outer end opening edge of the two center holes; a circular turntable is provided in the inner cavity of the circular cup-shaped shell; a rotating shaft is respectively extended from the edge of the two end surfaces of the circular turntable; the center lines of the two rotating shafts coincide with each other, and the center lines of the two rotating shafts are parallel to the center line of the circular turntable; a bearing is fixedly assembled on the side of each of the two rotating shafts, and the outer side surfaces of the outer rings of the two bearings are respectively connected to the two convex rings. The inner side surface of the circular turntable is fixedly fitted; an L-shaped oil delivery channel is opened between the end surface of the first rotating shaft and the side surface of the circular turntable, and the radial opening of the L-shaped oil delivery channel is a conical structure; a truncated cone-shaped elastic block and a return spring A are coaxially arranged in the radial section of the L-shaped oil delivery channel; the truncated cone-shaped elastic block can movably block the radial opening of the L-shaped oil delivery channel; the thin end surface of the truncated cone-shaped elastic block is a spherical surface, and the thin end surface of the truncated cone-shaped elastic block exceeds the radial opening of the L-shaped oil delivery channel; the two ends of the return spring A are respectively fixed to the thick end surface of the truncated cone-shaped elastic block and the hole wall of the L-shaped oil delivery channel;

[0007] A connecting hole A is formed through the side wall of the circular cup-shaped shell, and a groove is formed in the wall of the connecting hole A; a pressure sensor A is fixedly embedded in the groove, and the sensitive surface of the pressure sensor A exceeds the wall of the connecting hole A; a circular tubular graphite sleeve is sealed and docked with the connecting hole A, and the inner side of the circular tubular graphite sleeve exceeds the sensitive surface of the pressure sensor A; a circular cup-shaped plug is sealed and docked at the tail end of the circular tubular graphite sleeve, and the inner side of the circular cup-shaped plug exceeds the inner side of the circular tubular graphite sleeve; the inner cavity of the circular tubular graphite sleeve is coaxial with the inner surface of the circular tubular graphite sleeve. A cylindrical piston, a tubular elastic membrane sleeve, and a return spring B are provided; the front end face of the cylindrical piston contacts the side face of the circular turntable; the two end faces of the tubular elastic membrane sleeve are respectively sealed and fixed to the rear end face of the cylindrical piston and the edge of the cup mouth of the circular cup-shaped plug; the circular cup-shaped plug, the cylindrical piston, and the tubular elastic membrane sleeve together enclose a transfer chamber; the return spring B is located on the outside of the tubular elastic membrane sleeve, and the two ends of the return spring B are respectively fixed to the rear end face of the cylindrical piston and the edge of the cup mouth of the circular cup-shaped plug;

[0008] The side wall of the round cup-shaped plug is provided with a liquid extraction hole and a liquid delivery hole arranged side by side; a liquid extraction convex tube is extended from the edge of the outer end of the liquid extraction hole; a liquid delivery convex tube is extended from the edge of the outer end of the liquid delivery hole; the tail end of the liquid extraction convex tube is sealed and connected with a liquid extraction connecting tube; the tail end of the liquid delivery convex tube is sealed and connected with a liquid delivery connecting tube; the inner cavity of the liquid extraction connecting tube is equipped with a liquid extraction one-way valve; the inner cavity of the liquid delivery connecting tube is equipped with a liquid delivery one-way valve; the inner cavity of the liquid delivery connecting tube is equipped with a pressure Sensor B and flow sensor; the tail end of the liquid extraction connecting tube is sealed and connected to the liquid extraction catheter; the tail end of the liquid delivery connecting tube is sealed and connected to the liquid delivery catheter; the tail end of the liquid extraction catheter is provided with an end wall, and the tail side wall of the liquid extraction catheter is penetrated with a plurality of liquid extraction openings; the tail end of the liquid delivery catheter is provided with an end wall, and the tail side wall of the liquid delivery catheter is penetrated with a plurality of liquid delivery openings; the head side wall of the liquid extraction catheter is penetrated with a connecting hole B, and the connecting hole B is sealed and connected to the sheath tube.

[0009] During operation, the operating physician inserts a guidewire into the sheath and uses it to connect the various drainage ports on the drainage catheter to the patient's left ventricle and the various delivery ports on the delivery catheter to the patient's aorta. The axial opening of the L-shaped oil channel is connected to the lubricating oil source via a rotary joint. The second rotating shaft is connected to the output shaft of the drive motor via a coupling. The output terminals of pressure sensor A, pressure sensor B, and the flow sensor, as well as the control terminal of the drive motor, are all connected to a controller. An alarm is also connected to the controller.

[0010] The specific working process is as follows: The output shaft of the drive motor drives the two rotating shafts and the circular turntable through a coupling, and the circular turntable rotates eccentrically. During this eccentric rotation, the circular turntable and return spring B alternately push the cylindrical piston, causing it to reciprocate along the tubular graphite sleeve, thereby pumping blood from the left ventricle to the aorta. The specific pumping process is as follows: When the cylindrical piston moves away from the circular cup-shaped plug, the tubular elastic membrane sleeve stretches with the cylindrical piston (the volume of the transfer chamber increases), the withdrawal check valve opens (the delivery check valve closes), and the blood in the left ventricle flows into the transfer chamber through the withdrawal catheter, the withdrawal connecting tube, and the withdrawal convex tube. When the cylindrical piston moves toward the cup-shaped plug, the tubular elastic membrane sleeve contracts along with the cylindrical piston (the volume of the transfer chamber becomes smaller), the liquid delivery one-way valve opens (the liquid extraction one-way valve closes), and the blood in the transfer chamber flows into the aorta through the liquid delivery convex tube, the liquid delivery connecting tube, and the liquid delivery catheter in sequence.

[0011] During the above process, lubricating oil from the lubricating oil source flows into the L-shaped oil channel through the rotary joint. The truncated cone-shaped elastic block and return spring A rotate with the circular turntable. When the thin end surface of the truncated cone-shaped elastic block is not in contact with the front end surface of the cylindrical piston, the truncated cone-shaped elastic block, under the thrust of return spring A, blocks the radial opening of the L-shaped oil channel, preventing the lubricating oil in the L-shaped oil channel from flowing out. When the thin end surface of the truncated cone-shaped elastic block rotates until it contacts the front end surface of the cylindrical piston, the truncated cone-shaped elastic block is pressed back into the radial opening of the L-shaped oil channel by the cylindrical piston, forming a gap between the truncated cone-shaped elastic block and the radial opening of the L-shaped oil channel. This allows the lubricating oil in the L-shaped oil channel to flow out through the gap, thereby achieving lubrication between the circular turntable and the cylindrical piston, and between the circular turntable and the round cup-shaped housing. Because graphite inherently lubricates, oil-free lubrication is achieved between the cylindrical piston and the tubular graphite sleeve. The controller uses pressure sensor A to monitor the tubular graphite sleeve in real time for excessive wear. The specific monitoring process is as follows: As the cylindrical piston reciprocates along the tubular graphite sleeve, it wears the sleeve, causing the sleeve's inner diameter to increase. If the output of pressure sensor A does not exceed a preset value, it indicates that the sensing surface of pressure sensor A is not in contact with the side of the cylindrical piston, thus indicating that the inner surface of the tubular graphite sleeve extends beyond the sensing surface of pressure sensor A. The controller then determines that the sleeve has not experienced excessive wear. If the output of pressure sensor A exceeds a preset value, it indicates that the sensing surface of pressure sensor A is in contact with the side of the cylindrical piston, thus indicating that the inner surface of the tubular graphite sleeve is flush with the sensing surface of pressure sensor A. The controller then determines that the sleeve has experienced excessive wear and issues an alarm to alert the operator to replace the sleeve and clean any graphite debris within the device. The pressure sensor B measures the blood pressure in the liquid delivery connecting tube in real time and sends the measurement results to the controller in real time. When the blood pressure in the liquid delivery connecting tube deviates from the preset normal value, the controller adjusts the speed of the drive motor in real time according to the measurement results, so that the blood pressure in the liquid delivery connecting tube returns to the normal value, thereby ensuring the patient's life safety. The flow sensor measures the blood flow in the liquid delivery connecting tube in real time and sends the measurement results to the controller in real time. When the blood flow in the liquid delivery connecting tube deviates from the preset normal value, the controller adjusts the speed of the drive motor in real time according to the measurement results, so that the blood flow in the liquid delivery connecting tube returns to the normal value, thereby ensuring the patient's life safety.

[0012] Based on the above process, the piston-type VAD described in the present invention, based on a novel structure, offers the following advantages compared to existing VADs: First, instead of relying on a high-speed rotating impeller to pump blood, the present invention utilizes the eccentric rotation of a circular turntable and the reciprocating motion of a cylindrical piston to pump blood, effectively avoiding shear damage to the blood and, consequently, hemolysis. Second, compared to external magnetic levitation VADs, the present invention is not limited by magnetic levitation technology. This means it is not susceptible to external motion and electromagnetic interference, and its manufacturing cost is significantly reduced, thereby effectively improving operational stability and reducing the financial burden on patients.

[0013] The present invention has a reasonable structure and ingenious design, and effectively solves the problems of existing ventricular assist devices that easily cause hemolysis, have poor working stability, and cause a heavy economic burden on patients, and is suitable for ventricular assist. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a first structural schematic diagram of the present invention.

[0015] Figure 2 yes Figure 1 Schematic diagram of the structure from another angle.

[0016] Figure 3 This is a schematic diagram of the first structure of the liquid extraction catheter and the liquid delivery catheter in the present invention.

[0017] Figure 4 It is a second structural schematic diagram of the present invention.

[0018] Figure 5 yes Figure 4 Schematic diagram of the structure from another angle.

[0019] Figure 6 This is a second structural schematic diagram of the liquid extraction catheter and the liquid delivery catheter in the present invention.

[0020] Figure 7 This is a partial structural diagram of the present invention Figure 1 .

[0021] Figure 8 yes Figure 7 Working status reference diagram.

[0022] Figure 9 yes Figure 7 Schematic diagram of part of the structure.

[0023] Figure 10 yes Figure 9 Schematic diagram of part of the structure.

[0024] Figure 11 yes Figure 10Schematic diagram of part of the structure.

[0025] Figure 12 This is a partial structural diagram of the present invention Figure 2 .

[0026] Figure 13 yes Figure 12 Schematic diagram of part of the structure.

[0027] Figure 14 It is a schematic cross-sectional structure diagram of the circular turntable, two rotating shafts, truncated cone-shaped elastic block, and return spring A in the present invention.

[0028] Figure 15 It is a structural schematic diagram of the round cup-shaped shell, the round tubular graphite sleeve, the round cup-shaped plug, the liquid extraction convex tube, and the liquid delivery convex tube in the present invention.

[0029] Figure 16 yes Figure 15 Exploded diagram of the structure.

[0030] Figure 17 It is a structural schematic diagram of the round cup-shaped housing, the pressure sensor A, and the round tubular graphite sleeve in the present invention.

[0031] Figure 18 yes Figure 17 A partial enlarged view of point A in the middle.

[0032] Figure 19 It is a structural schematic diagram of the liquid extraction connecting pipe, the liquid delivery connecting pipe, the liquid extraction one-way valve, the liquid delivery one-way valve, the liquid extraction medical connector, and the liquid delivery medical connector in the present invention.

[0033] Figure 20 yes Figure 19 Exploded diagram of the structure.

[0034] Figure 21 It is a structural diagram of the liquid extraction connecting tube, the liquid delivery connecting tube, the pressure sensor B, the liquid extraction medical connector, and the liquid delivery medical connector in the present invention.

[0035] Figure 22 It is a structural schematic diagram of the liquid extraction connecting tube, the liquid delivery connecting tube, the flow sensor, the liquid extraction medical connector, and the liquid delivery medical connector in the present invention.

[0036] In the figure: 1-cup-shaped housing, 2-cup-shaped end cover, 3-convex ring, 4-circular turntable, 5-rotating shaft, 6-bearing, 7-L-shaped oil delivery channel, 8-truncated cone-shaped elastic block, 9-reset spring A, 10-pressure sensor A, 11-cylindrical graphite sleeve, 12-cup-shaped plug, 13-cylindrical piston, 14-cylindrical elastic membrane sleeve, 15-reset spring B, 16.1-liquid extraction convex tube, 16.2-liquid delivery convex tube, 17.1-Liquid extraction connecting tube, 17.2-Liquid delivery connecting tube, 18.1-Liquid extraction check valve, 18.2-Liquid delivery check valve, 19-Pressure sensor B, 20-Flow sensor, 21.1-Liquid extraction catheter, 21.2-Liquid delivery catheter, 22.1-Liquid extraction port, 22.2-Liquid delivery port, 23-Sheath, 24-Bearing cover, 25-Keyway, 26.1-Liquid extraction medical connector, 26.2-Liquid delivery medical connector. DETAILED DESCRIPTION Example 1

[0037] A piston-type ventricular assist device comprises a round cup-shaped housing 1;

[0038] The cup mouth of the circular cup-shaped shell 1 is sealed with a circular cup-shaped end cover 2; a center hole is respectively opened through the center of the end wall of the circular cup-shaped shell 1 and the center of the end wall of the circular cup-shaped end cover 2, and a convex ring 3 is respectively extended from the outer end opening edge of the two center holes; a circular turntable 4 is provided in the inner cavity of the circular cup-shaped shell 1; a rotating shaft 5 is respectively extended from the edge of the two end surfaces of the circular turntable 4; the center lines of the two rotating shafts 5 coincide with each other, and the center lines of the two rotating shafts 5 are parallel to the center line of the circular turntable 4; a bearing 6 is fixedly assembled on the side of each of the two rotating shafts 5, and the outer side surfaces of the outer rings of the two bearings 6 are respectively aligned with the two convex rings 3 is fixedly fitted with the inner surface of the circular turntable 4; an L-shaped oil delivery channel 7 is opened between the end surface of the first rotating shaft 5 and the side surface of the circular turntable 4, and the radial opening of the L-shaped oil delivery channel 7 is a conical structure; a truncated cone-shaped elastic block 8 and a return spring A9 are coaxially arranged in the radial section of the L-shaped oil delivery channel 7; the truncated cone-shaped elastic block 8 can movably block the radial opening of the L-shaped oil delivery channel 7; the thin end surface of the truncated cone-shaped elastic block 8 is a spherical surface, and the thin end surface of the truncated cone-shaped elastic block 8 exceeds the radial opening of the L-shaped oil delivery channel 7; the two ends of the return spring A9 are respectively fixed to the thick end surface of the truncated cone-shaped elastic block 8 and the hole wall of the L-shaped oil delivery channel 7;

[0039] A connecting hole A is formed through the side wall of the circular cup-shaped shell 1, and a groove is formed in the wall of the connecting hole A; a pressure sensor A10 is fixedly embedded in the groove, and the sensitive surface of the pressure sensor A10 exceeds the wall of the connecting hole A; a circular tubular graphite sleeve 11 is sealed and docked with the connecting hole A, and the inner side of the circular tubular graphite sleeve 11 exceeds the sensitive surface of the pressure sensor A10; a circular cup-shaped plug 12 is sealed and docked at the tail end of the circular tubular graphite sleeve 11, and the inner side of the circular cup-shaped plug 12 exceeds the inner side of the circular tubular graphite sleeve 11; a cylindrical shaped piston 13, tubular elastic membrane sleeve 14, and return spring B15; the front end surface of the cylindrical piston 13 contacts the side surface of the circular turntable 4; the two end surfaces of the tubular elastic membrane sleeve 14 are respectively sealed and fixed with the rear end surface of the cylindrical piston 13 and the edge of the cup mouth of the circular cup-shaped plug 12; the circular cup-shaped plug 12, the cylindrical piston 13, and the tubular elastic membrane sleeve 14 together enclose a transfer chamber; the return spring B15 is located on the outside of the tubular elastic membrane sleeve 14, and the two ends of the return spring B15 are respectively fixed with the rear end surface of the cylindrical piston 13 and the edge of the cup mouth of the circular cup-shaped plug 12;

[0040] The side wall of the round cup-shaped plug 12 is provided with a liquid extraction hole and a liquid delivery hole arranged side by side; a liquid extraction convex tube 16.1 is extended from the outer edge of the liquid extraction hole; a liquid delivery convex tube 16.2 is extended from the outer edge of the liquid delivery hole; the tail end of the liquid extraction convex tube 16.1 is sealed with a liquid extraction connecting tube 17.1; the tail end of the liquid delivery convex tube 16.2 is sealed with a liquid delivery connecting tube 17.2; the inner cavity of the liquid extraction connecting tube 17.1 is installed with a liquid extraction check valve 18.1; the inner cavity of the liquid delivery connecting tube 17.2 is installed with a liquid delivery check valve 18.2; the inner cavity of the liquid delivery connecting tube 17.2 is installed with a pressure sensor Device B19 and flow sensor 20; the tail end of the liquid extraction connecting tube 17.1 is sealed and connected to the liquid extraction conduit 21.1; the tail end of the liquid delivery connecting tube 17.2 is sealed and connected to the liquid delivery conduit 21.2; the tail end of the liquid extraction conduit 21.1 is provided with an end wall, and the tail side wall of the liquid extraction conduit 21.1 is penetrated by a plurality of liquid extraction openings 22.1; the tail end of the liquid delivery conduit 21.2 is provided with an end wall, and the tail side wall of the liquid delivery conduit 21.2 is penetrated by a plurality of liquid delivery openings 22.2; the head side wall of the liquid extraction conduit 21.1 is penetrated by a connecting hole B, and the connecting hole B is sealed and connected to the sheath tube 23.

[0041] A bearing cover 24 is coaxially fixed to the end faces of the two protruding rings 3 .

[0042] Both rotating shafts 5 are stepped shafts; a keyway 25 is provided on the side of the second rotating shaft 5 .

[0043] The pressure sensor A10, the pressure sensor B19, and the flow sensor 20 are all wireless sensors.

[0044] The circular tubular elastic membrane sleeve 14, the liquid extraction conduit 21.1, the liquid delivery conduit 21.2, and the sheath 23 are all made of polymer materials; the wall thickness of the circular tubular elastic membrane sleeve 14 is 0.1 mm; the wall thickness of the liquid extraction conduit 21.1 and the wall thickness of the liquid delivery conduit 21.2 are both 0.05 mm; the two end faces of the circular tubular elastic membrane sleeve 14 are sealed and fixed to the tail end face of the cylindrical piston 13 and the cup edge of the circular cup-shaped plug 12 by hot melting.

[0045] The polymer material is silica gel, polyethylene or thermoplastic polyurethane elastomer.

[0046] The outer side surface of the tail end of the liquid extraction connecting tube 17.1 and the outer side surface of the head end of the liquid extraction catheter 21.1 are each fixedly equipped with a liquid extraction medical connector 26.1, and the two liquid extraction medical connectors 26.1 are sealed and connected; the outer side surface of the tail end of the liquid delivery connecting tube 17.2 and the outer side surface of the head end of the liquid delivery catheter 21.2 are each fixedly equipped with a liquid delivery medical connector 26.2, and the two liquid delivery medical connectors 26.2 are sealed and connected.

[0047] The liquid extraction check valve 18.1 and the liquid delivery check valve 18.2 are both spring-loaded check valves.

[0048] like Figures 1 to 3 As shown, in this embodiment, the liquid delivery conduit 21.2 includes a thin tube section, a transition tube section, and a thick tube section from beginning to end; the liquid extraction conduit 21.1 is sealed and passes through the side wall and tail end wall of the transition tube section of the liquid delivery conduit 21.2; the first and tail sections of the liquid extraction conduit 21.1 are both located outside the liquid delivery conduit 21.2; the remaining section of the liquid extraction conduit 21.1 is located inside the liquid delivery conduit 21.2; the outer diameter of the liquid extraction conduit 21.1 is equal to the outer diameter of the thin tube section of the liquid delivery conduit 21.2; the number of the liquid extraction ports 22.1 is three, and the three liquid extraction ports 22.1 are arranged equidistantly along the circumferential direction; the number of the liquid delivery ports 22.2 is four, and the four liquid delivery ports 22.2 are arranged equidistantly along the circumferential direction.

[0049] In a specific implementation, the outer diameter of the liquid extraction conduit 21.1 and the outer diameter of the thin tube section of the liquid delivery conduit 21.2 are both 1.8 mm; the outer diameter of the thick tube section of the liquid delivery conduit 21.2 is 3 mm. Example 2

[0050] A piston-type ventricular assist device comprises a round cup-shaped housing 1;

[0051] The cup mouth of the circular cup-shaped shell 1 is sealed with a circular cup-shaped end cover 2; a center hole is respectively opened through the center of the end wall of the circular cup-shaped shell 1 and the center of the end wall of the circular cup-shaped end cover 2, and a convex ring 3 is respectively extended from the outer end opening edge of the two center holes; a circular turntable 4 is provided in the inner cavity of the circular cup-shaped shell 1; a rotating shaft 5 is respectively extended from the edge of the two end surfaces of the circular turntable 4; the center lines of the two rotating shafts 5 coincide with each other, and the center lines of the two rotating shafts 5 are parallel to the center line of the circular turntable 4; a bearing 6 is fixedly assembled on the side of each of the two rotating shafts 5, and the outer side surfaces of the outer rings of the two bearings 6 are respectively aligned with the two convex rings 3 is fixedly fitted with the inner surface of the circular turntable 4; an L-shaped oil delivery channel 7 is opened between the end surface of the first rotating shaft 5 and the side surface of the circular turntable 4, and the radial opening of the L-shaped oil delivery channel 7 is a conical structure; a truncated cone-shaped elastic block 8 and a return spring A9 are coaxially arranged in the radial section of the L-shaped oil delivery channel 7; the truncated cone-shaped elastic block 8 can movably block the radial opening of the L-shaped oil delivery channel 7; the thin end surface of the truncated cone-shaped elastic block 8 is a spherical surface, and the thin end surface of the truncated cone-shaped elastic block 8 exceeds the radial opening of the L-shaped oil delivery channel 7; the two ends of the return spring A9 are respectively fixed to the thick end surface of the truncated cone-shaped elastic block 8 and the hole wall of the L-shaped oil delivery channel 7;

[0052] A connecting hole A is formed through the side wall of the circular cup-shaped shell 1, and a groove is formed in the wall of the connecting hole A; a pressure sensor A10 is fixedly embedded in the groove, and the sensitive surface of the pressure sensor A10 exceeds the wall of the connecting hole A; a circular tubular graphite sleeve 11 is sealed and docked with the connecting hole A, and the inner side of the circular tubular graphite sleeve 11 exceeds the sensitive surface of the pressure sensor A10; a circular cup-shaped plug 12 is sealed and docked at the tail end of the circular tubular graphite sleeve 11, and the inner side of the circular cup-shaped plug 12 exceeds the inner side of the circular tubular graphite sleeve 11; a cylindrical shaped piston 13, tubular elastic membrane sleeve 14, and return spring B15; the front end surface of the cylindrical piston 13 contacts the side surface of the circular turntable 4; the two end surfaces of the tubular elastic membrane sleeve 14 are respectively sealed and fixed with the rear end surface of the cylindrical piston 13 and the edge of the cup mouth of the circular cup-shaped plug 12; the circular cup-shaped plug 12, the cylindrical piston 13, and the tubular elastic membrane sleeve 14 together enclose a transfer chamber; the return spring B15 is located on the outside of the tubular elastic membrane sleeve 14, and the two ends of the return spring B15 are respectively fixed with the rear end surface of the cylindrical piston 13 and the edge of the cup mouth of the circular cup-shaped plug 12;

[0053] The side wall of the round cup-shaped plug 12 is provided with a liquid extraction hole and a liquid delivery hole arranged side by side; a liquid extraction convex tube 16.1 is extended from the outer edge of the liquid extraction hole; a liquid delivery convex tube 16.2 is extended from the outer edge of the liquid delivery hole; the tail end of the liquid extraction convex tube 16.1 is sealed with a liquid extraction connecting tube 17.1; the tail end of the liquid delivery convex tube 16.2 is sealed with a liquid delivery connecting tube 17.2; the inner cavity of the liquid extraction connecting tube 17.1 is installed with a liquid extraction check valve 18.1; the inner cavity of the liquid delivery connecting tube 17.2 is installed with a liquid delivery check valve 18.2; the inner cavity of the liquid delivery connecting tube 17.2 is installed with a pressure sensor Device B19 and flow sensor 20; the tail end of the liquid extraction connecting tube 17.1 is sealed and connected to the liquid extraction conduit 21.1; the tail end of the liquid delivery connecting tube 17.2 is sealed and connected to the liquid delivery conduit 21.2; the tail end of the liquid extraction conduit 21.1 is provided with an end wall, and the tail side wall of the liquid extraction conduit 21.1 is penetrated by a plurality of liquid extraction openings 22.1; the tail end of the liquid delivery conduit 21.2 is provided with an end wall, and the tail side wall of the liquid delivery conduit 21.2 is penetrated by a plurality of liquid delivery openings 22.2; the head side wall of the liquid extraction conduit 21.1 is penetrated by a connecting hole B, and the connecting hole B is sealed and connected to the sheath tube 23.

[0054] A bearing cover 24 is coaxially fixed to the end faces of the two protruding rings 3 .

[0055] Both rotating shafts 5 are stepped shafts; a keyway 25 is provided on the side of the second rotating shaft 5 .

[0056] The pressure sensor A10, the pressure sensor B19, and the flow sensor 20 are all wireless sensors.

[0057] The circular tubular elastic membrane sleeve 14, the liquid extraction conduit 21.1, the liquid delivery conduit 21.2, and the sheath 23 are all made of polymer materials; the wall thickness of the circular tubular elastic membrane sleeve 14 is 0.1 mm; the wall thickness of the liquid extraction conduit 21.1 and the wall thickness of the liquid delivery conduit 21.2 are both 0.05 mm; the two end faces of the circular tubular elastic membrane sleeve 14 are sealed and fixed to the tail end face of the cylindrical piston 13 and the cup edge of the circular cup-shaped plug 12 by hot melting.

[0058] The polymer material is silica gel, polyethylene or thermoplastic polyurethane elastomer.

[0059] The outer side surface of the tail end of the liquid extraction connecting tube 17.1 and the outer side surface of the head end of the liquid extraction catheter 21.1 are each fixedly equipped with a liquid extraction medical connector 26.1, and the two liquid extraction medical connectors 26.1 are sealed and connected; the outer side surface of the tail end of the liquid delivery connecting tube 17.2 and the outer side surface of the head end of the liquid delivery catheter 21.2 are each fixedly equipped with a liquid delivery medical connector 26.2, and the two liquid delivery medical connectors 26.2 are sealed and connected.

[0060] The liquid extraction check valve 18.1 and the liquid delivery check valve 18.2 are both spring-loaded check valves.

[0061] like Figures 4 to 6 As shown, in this embodiment, the liquid extraction conduit 21.1 and the liquid delivery conduit 21.2 are fixed side by side; the length of the liquid extraction conduit 21.1 is greater than the length of the liquid delivery conduit 21.2; the outer diameter of the liquid extraction conduit 21.1 is equal to the outer diameter of the liquid delivery conduit 21.2; the number of the liquid extraction ports 22.1 is three, and the three liquid extraction ports 22.1 are arranged equidistantly along the circumferential direction; the number of the liquid delivery ports 22.2 is three, and the three liquid delivery ports 22.2 are arranged equidistantly along the circumferential direction.

[0062] In a specific implementation, the outer diameter of the liquid extraction conduit 21.1 and the outer diameter of the liquid delivery conduit 21.2 are both 1.5 mm.

[0063] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A piston-type ventricular assist device, characterized in that: It comprises a round cup-shaped shell (1); The cup mouth of the circular cup-shaped shell (1) is sealed with a circular cup-shaped end cover (2); a central hole is respectively opened through the center of the end wall of the circular cup-shaped shell (1) and the center of the end wall of the circular cup-shaped end cover (2), and a convex ring (3) is respectively extended from the outer end opening edge of the two central holes; a circular turntable (4) is provided in the inner cavity of the circular cup-shaped shell (1); a rotating shaft (5) is respectively extended from the edge of the two end surfaces of the circular turntable (4); the center lines of the two rotating shafts (5) coincide with each other, and the center lines of the two rotating shafts (5) are parallel to the center line of the circular turntable (4); a bearing (6) is fixedly assembled on the side of each of the two rotating shafts (5), and the outer side surfaces of the outer rings of the two bearings (6) are respectively aligned with the two convex rings ( 3) is fixedly matched with the inner side surface of the circular turntable (4); an L-shaped oil delivery channel (7) is opened between the end surface of the first rotating shaft (5) and the side surface of the circular turntable (4), and the radial opening of the L-shaped oil delivery channel (7) is a conical structure; a truncated cone-shaped elastic block (8) and a return spring A (9) are coaxially arranged in the radial section of the L-shaped oil delivery channel (7); the truncated cone-shaped elastic block (8) can be movably blocked in the radial opening of the L-shaped oil delivery channel (7); the thin end surface of the truncated cone-shaped elastic block (8) is a spherical surface, and the thin end surface of the truncated cone-shaped elastic block (8) exceeds the radial opening of the L-shaped oil delivery channel (7); the two ends of the return spring A (9) are respectively fixed to the thick end surface of the truncated cone-shaped elastic block (8) and the hole wall of the L-shaped oil delivery channel (7); A connecting hole A is formed through the side wall of the circular cup-shaped shell (1), and a groove is formed in the hole wall of the connecting hole A; a pressure sensor A (10) is fixedly embedded in the groove, and the sensitive surface of the pressure sensor A (10) exceeds the hole wall of the connecting hole A; a circular tubular graphite sleeve (11) is sealed and docked with the connecting hole A, and the inner side surface of the circular tubular graphite sleeve (11) exceeds the sensitive surface of the pressure sensor A (10); a circular cup-shaped plug (12) is sealed and docked at the tail end of the circular tubular graphite sleeve (11), and the inner side surface of the circular cup-shaped plug (12) exceeds the inner side surface of the circular tubular graphite sleeve (11); a cylindrical piston (11) is coaxially arranged in the inner cavity of the circular tubular graphite sleeve (11) 3), a tubular elastic membrane sleeve (14), and a return spring B (15); the front end surface of the cylindrical piston (13) contacts the side surface of the circular turntable (4); the two end surfaces of the tubular elastic membrane sleeve (14) are respectively sealed and fixed with the rear end surface of the cylindrical piston (13) and the edge of the cup mouth of the circular cup-shaped plug (12); the circular cup-shaped plug (12), the cylindrical piston (13), and the tubular elastic membrane sleeve (14) are jointly enclosed to form a transfer chamber; the return spring B (15) is located outside the tubular elastic membrane sleeve (14), and the two ends of the return spring B (15) are respectively fixed with the rear end surface of the cylindrical piston (13) and the edge of the cup mouth of the circular cup-shaped plug (12); The side wall of the round cup-shaped plug (12) is provided with a liquid extraction hole and a liquid delivery hole arranged side by side; a liquid extraction convex tube (16.1) is extended from the edge of the outer end opening of the liquid extraction hole; a liquid delivery convex tube (16.2) is extended from the edge of the outer end opening of the liquid delivery hole; the tail end opening of the liquid extraction convex tube (16.1) is sealed and connected to a liquid extraction connecting tube (17.1); the tail end opening of the liquid delivery convex tube (16.2) is sealed and connected to a liquid delivery connecting tube (17.2); the inner cavity of the liquid extraction connecting tube (17.1) is installed with a liquid extraction check valve (18.1); the inner cavity of the liquid delivery connecting tube (17.2) is installed with a liquid delivery check valve (18.2); the inner cavity of the liquid delivery connecting tube (17.2) is installed with a pressure sensor B (19) and a flow sensor (20); the tail end of the liquid extraction connecting tube (17.1) is sealed and connected to a liquid extraction conduit (21.1); the tail end of the liquid delivery connecting tube (17.2) is sealed and connected to a liquid delivery conduit (21.2); the tail end of the liquid extraction conduit (21.1) is provided with an end wall, and the tail side wall of the liquid extraction conduit (21.1) is provided with a plurality of liquid extraction openings (22.1); the tail end of the liquid delivery conduit (21.2) is provided with an end wall, and the tail side wall of the liquid delivery conduit (21.2) is provided with a plurality of liquid delivery openings (22.2); the head side wall of the liquid extraction conduit (21.1) is provided with a connecting hole B, and the connecting hole B is sealed and connected to a sheath tube (23).

2. The piston-type ventricular assist device according to claim 1, characterized in that: A bearing cover (24) is coaxially fixed to the end faces of the two convex rings (3).

3. The piston-type ventricular assist device according to claim 1, characterized in that: Both rotating shafts (5) are stepped shafts; a keyway (25) is provided on the side surface of the second rotating shaft (5).

4. The piston-type ventricular assist device according to claim 1, characterized in that: The pressure sensor A (10), the pressure sensor B (19), and the flow sensor (20) are all wireless sensors.

5. The piston-type ventricular assist device according to claim 1, characterized in that: The circular tubular elastic membrane sleeve (14), the liquid extraction catheter (21.1), the liquid delivery catheter (21.2), and the sheath (23) are all made of polymer materials; the wall thickness of the circular tubular elastic membrane sleeve (14) is 0.1 mm; the wall thickness of the liquid extraction catheter (21.1) and the wall thickness of the liquid delivery catheter (21.2) are both 0.05 mm; the two end faces of the circular tubular elastic membrane sleeve (14) are sealed and fixed to the tail end face of the cylindrical piston (13) and the cup edge of the round cup-shaped plug (12) by hot melting.

6. The piston-type ventricular assist device according to claim 5, characterized in that: The polymer material is silica gel, polyethylene or thermoplastic polyurethane elastomer.

7. The piston-type ventricular assist device according to claim 1, characterized in that: The outer side surface of the tail end of the liquid extraction connecting tube (17.1) and the outer side surface of the head end of the liquid extraction catheter (21.1) are each fixedly assembled with a liquid extraction medical connector (26.1), and the two liquid extraction medical connectors (26.1) are sealed and butted together; the outer side surface of the tail end of the liquid delivery connecting tube (17.2) and the outer side surface of the head end of the liquid delivery catheter (21.2) are each fixedly assembled with a liquid delivery medical connector (26.2), and the two liquid delivery medical connectors (26.2) are sealed and butted together.

8. The piston-type ventricular assist device according to claim 1, characterized in that: The liquid extraction check valve (18.1) and the liquid delivery check valve (18.2) are both spring-loaded check valves.

9. The piston-type ventricular assist device according to any one of claims 1 to 8, characterized in that: The liquid delivery conduit (21.2) comprises a thin tube section, a transition tube section, and a thick tube section from beginning to end; the liquid extraction conduit (21.1) seals and penetrates the side wall and tail end wall of the transition tube section of the liquid delivery conduit (21.2); the first section and the tail section of the liquid extraction conduit (21.1) are both located outside the liquid delivery conduit (21.2); the remaining section of the liquid extraction conduit (21.1) is located inside the liquid delivery conduit (21.2); the outer diameter of the liquid extraction conduit (21.1) is equal to the outer diameter of the thin tube section of the liquid delivery conduit (21.2); the number of the liquid extraction ports (22.1) is three, and the three liquid extraction ports (22.1) are arranged equidistantly along the circumferential direction; the number of the liquid delivery ports (22.2) is four, and the four liquid delivery ports (22.2) are arranged equidistantly along the circumferential direction.

10. The piston-type ventricular assist device according to any one of claims 1 to 8, characterized in that: The liquid extraction conduit (21.1) and the liquid delivery conduit (21.2) are fixed side by side; the length of the liquid extraction conduit (21.1) is greater than the length of the liquid delivery conduit (21.2); the outer diameter of the liquid extraction conduit (21.1) is equal to the outer diameter of the liquid delivery conduit (21.2); the number of the liquid extraction openings (22.1) is three, and the three liquid extraction openings (22.1) are arranged at equal distances along the circumference; the number of the liquid delivery openings (22.2) is three, and the three liquid delivery openings (22.2) are arranged at equal distances along the circumference.

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