CN214912654U - Bionic blood pump - Google Patents

Abstract

The utility model discloses a bionic blood pump, which comprises a pipeline for blood circulation and a driving device for providing power for blood flow, wherein the pipeline is formed by a pump sac with a sac-shaped structure, the pump sac comprises a tube sac and sealing plates positioned at two ends of the tube sac, the whole tube sac is twisted in a twist shape, a plurality of elastic memory alloys which are uniformly distributed are arranged in the wall of the tube sac, a blood inlet port and a bleeding port are respectively arranged on the two sealing plates, and the blood inlet port and the bleeding port are respectively provided with a one-way valve; the driving device is connected to the sealing plates and drives the tube bag to compress and/or twist through the sealing plates, the tube bag is compressed along the length direction of the tube bag, and the twisting of the tube bag is driven by the two sealing plates to rotate in opposite directions. Bionic blood pump structure unique, make blood and pump shaft separation, can effectively avoid the blood pump to get or the rotatory destruction to the blood cell when going into, also can avoid conventional blood pump to destroy to the extrusion of blood cell simultaneously.

Description

Bionic blood pump

Technical Field

The utility model belongs to the technical field of medical equipment, concretely relates to bionical formula blood pump.

Background

In the extracorporeal circulation, venous blood needs to be drained to the outside of the body by an artificial device, and the blood is pumped back to the human body after oxygenation, temperature regulation and other operations. Therefore, the pumping and pumping of blood is assisted by a power device, and the existing power device mostly adopts a centrifugal pump, a rolling pressure pump or an axial flow pump to provide blood power. For a centrifugal pump and an axial flow pump, in order to ensure the pumping flow of blood and the like, the diameter of a pump body is generally small, the rotating speed of an impeller is large, the blood is in direct contact with a spiral impeller in the pump, and the power is provided for the blood through the high-speed rotation of the impeller, but the blood pump has a large physiological problem that blood cells in the blood are easily damaged to cause hemolysis under the long-time rotation of the impeller due to the direct contact of the blood and blades, and the long-time operation of the impeller generates heat to possibly cause the physiological denaturation of the blood; in the case of a roller pump, although such a pump does not directly contact blood, the hemodynamic forces from the roller compress the blood delivery conduit, which also damages blood cells. In the actual operation process, after each extracorporeal circulation is finished, the infusion pipeline at the position of the rolling pump is often stained red, and even more, the urine of a patient turns red.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses a bionic blood pump, this device structure is unique, makes blood and pump shaft separation, can effectively avoid the blood pump to get or the pump when going into to the rotatory destruction of blood cell, also can avoid conventional blood pump to destroy the extrusion of blood cell simultaneously.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a bionic blood pump comprises a pipeline for blood circulation and a driving device for providing power for blood flow, wherein the pipeline is formed by a pump sac with a sac-shaped structure, the pump sac comprises a tube sac and sealing plates positioned at two ends of the tube sac, the whole tube sac is twisted in a twist shape, a plurality of elastic memory alloys which are uniformly distributed are arranged in the wall of the tube sac, a blood inlet port and a bleeding port are respectively arranged on the two sealing plates, and one-way valves are respectively arranged at the blood inlet port and the bleeding port; the driving device is connected to the sealing plates and drives the tube bag to compress and/or twist through the sealing plates, the tube bag is compressed along the length direction of the tube bag, and the twisting of the tube bag is driven by the two sealing plates to rotate in opposite directions.

As the utility model relates to a bionic blood pump's further improvement: the pipe bag wall is flexible material, and the medial surface of bag wall has the bar arch, and the bellied non-connection face of bar is mutual overlap joint between cambered surface and two adjacent bar archs, and elastic memory alloy wears to locate in the bar arch.

As the utility model relates to a bionic blood pump's further improvement: the driving device comprises a servo motor which is controlled by a circuit to rotate in the forward direction and the reverse direction, a motor output shaft of the servo motor penetrates through the two sealing plates, threads which are matched with each other are arranged on the motor output shaft and the sealing plates, and the rotating directions of the threads on the two sealing plates are opposite; and a sealing sleeve is arranged between the threads of the two sealing plates, and the output shaft of the motor penetrates through the sealing sleeve.

As the utility model relates to a bionic blood pump's further improvement: and the two sealing plates are provided with threads, and the rotating directions of the two threads on the two sealing plates are opposite.

As the utility model relates to a bionic blood pump's further improvement: one of the sealing plates is fixedly connected with the driving device, and the other sealing plate is in threaded connection with the output shaft of the motor.

As the utility model relates to a bionic blood pump's further improvement: the pitch of the thread on the output shaft of the motor is the same as the distance between the two sealing plates.

As the utility model relates to a bionic blood pump's further improvement: the driving device is a hydraulic mechanism arranged on one sealing plate, a piston rod of the hydraulic mechanism is fixedly connected with the other sealing plate, and the blood inlet port and the blood outlet port are respectively positioned at the central positions of the sealing plates.

As the utility model relates to a bionic blood pump's further improvement: a plurality of pump blood vessels which can be wound with each other are arranged in the tube sac, wherein each pump blood vessel can be twisted spirally along the axis of the pump blood vessel, the pump blood vessels are wound with each other to form a blood vessel cluster, and the blood vessel cluster can be twisted spirally along the axis of the blood vessel cluster; the sealing plate is of a hollow structure, a conical shunt is arranged in a cavity of the sealing plate and fixed on the lower bottom surface of the cavity of the sealing plate, and through holes are formed in the lower bottom surface of the cavity to be respectively butted with the pump blood vessels.

As the utility model relates to a bionic blood pump's further improvement: the pipeline and the driving device are both wrapped by an outer bag, and the blood transfusion pipe is arranged at the blood inlet port and the blood outlet port and extends to the outside of the outer bag.

Advantageous effects

Compared with the prior art, bionical formula blood pump have following beneficial effect:

firstly, the bionic blood pump of the utility model has a unique structure, simulates the human heart to shrink through the compression and torsion of the tube sac, changes the volume of the inner cavity of the tube sac through the bionic action, further realizes the pumping out of the blood in the tube sac, and the continuous pumping pressure of the blood is realized after the bionic blood pump is repeatedly pumped out; the working principle of the impeller is different from that of a centrifugal pump or an axial flow pump, and the spiral blades are not arranged in the working cavity, so that blood cells can be effectively prevented from being damaged under the high-speed movement of the blades; compared with a roller pump, the blood pump of the device does not rely on the extrusion of blood to provide power when in work, thereby effectively avoiding the extrusion damage of the power device of the blood pump to blood cells.

Second, bionical formula blood pump, the torsional compression process of piping bag is according to piping bag self support body structure motion, its in the course of the work promptly, great fold can not appear in the piping bag inner wall, blood can not appear blood cell by friction/extrusion and broken phenomenon equally by the compression pump in-process, has effectively solved the destruction of current blood pump to blood cell.

Thirdly, the bionic blood pump of the utility model can realize the volume change of the tubular sac by changing the diameter of the middle part of the cavity only through the twisting of the tubular sac, and the inner wall of the tubular sac at the moment is provided with a plurality of strip-shaped bulges on the arc-shaped side surfaces which are mutually lapped, so that the oppression on blood between the adjacent strip-shaped bulges can be reduced as much as possible in the rotating process; the change of the cavity volume of the tube sac can be realized by the torsion and the compression of the tube sac, and the change of the cavity of the tube sac at the moment replaces partial torsion by the compression in the length direction, thereby reducing the torsion amount and further reducing the oppression of the inner wall of the tube sac on the blood pressure.

Fourth, bionical formula blood pump to multichannel formula structure is equipped with the closing plate that has the shunt, makes the piping bag have higher pump pressure under the condition of the same change, in order to guarantee this device to the pump pressure effect of blood, the shunt makes each pump blood vessel reposition of redundant personnel even, prevents to shunt inequality, pump pressure unstability.

Fifth, the drive device of the bionic blood pump of the present invention can be driven by a hydraulic rod or a servo motor capable of rotating in two directions according to different usage scenarios, and simultaneously, different working modes of the tubular sac are satisfied; the distance between the thread pitch of the screw thread on the output shaft of the motor and the two sealing plates is set, so that the tube sac can rotate 180 degrees and just complete the compression of the tube sac, the state ensures the compression amount (single pumping amount) of the tube sac and only rotates half a circle at one end of the tube sac, and the compression of the torsion of the tube sac on blood cells can be effectively reduced.

Drawings

FIG. 1 is a schematic structural view of a biomimetic blood pump described in example 1;

FIG. 2 is a schematic structural view of the biomimetic blood pump described in embodiment 4;

FIG. 3 is a schematic structural view of the biomimetic blood pump described in embodiment 5;

FIG. 4 is a partial schematic cross-sectional view of the tube balloon in example 1;

FIG. 5 is a partial schematic cross-sectional view of the tube balloon in example 2;

FIG. 6 is a schematic view showing a structure of a longitudinal section of a sealing plate in embodiment 6;

the labels in the figure are: 1. the blood transfusion device comprises a driving device, 101, a motor output shaft, 102, a piston rod, 2, a tube bag, 201, elastic memory alloy, 202, a strip-shaped protrusion, 3, a sealing plate, 301, a blood inlet port, 302, a conical flow divider, 303, a through hole, 304 and a bleeding port.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and specific embodiments, which are provided in the present embodiment on the premise of the technical solution of the present invention.

Example 1

The bionic blood pump comprises a pipeline for blood circulation and a driving device 1 for providing power for blood flowing, wherein the pipeline is formed by a pump sac of a sac-shaped structure, the pump sac comprises a tube sac 2 and sealing plates 3 positioned at two ends of the tube sac 2, the tube sac 2 is integrally twisted in a twist shape, a plurality of elastic memory alloys 201 which are uniformly distributed are arranged in the wall of the tube sac 2, specifically, the wall of the tube sac 2 in the embodiment is made of flexible materials, medical silica gel can be used, the elastic memory alloys 201 serve as supporting pieces in the length direction of the tube sac 2, elastic support is provided in the diameter direction of the tube sac 2 in the twisting process, the inner walls of the tube sac 2 are prevented from being mutually attached in the twisting process, and the situation that blood cells are pressed is caused. The initial state of the capsule 2 in this embodiment may be a standard cylinder, or it may be a spindle shape in the initial state of the capsule 2, i.e. there is a partial twist in the initial state. In the working process of the device, the volume of the tube sac 2 is reduced by twisting the tube sac, and then the blood is pumped out of the cavity of the tube sac 2.

The two sealing plates 3 are respectively provided with a blood inlet port 301 and a blood outlet port 304, and the blood inlet port 301 and the blood outlet port 304 are both provided with a one-way valve, in the embodiment, the one-way valve at the blood inlet port 301 is opened inwards, and the one-way valve at the blood outlet port 304 is opened outwards, so that even in the compression or torsion process of the tube bag 2, blood flows in one way, namely, the pumping-in and pumping-out of the blood are realized.

The driving device 1 is connected to the sealing plate 3 and drives the tube bag 2 to compress and/or twist through the sealing plate 3, the tube bag 2 is compressed to move along the length direction of the tube bag, and the twisting of the tube bag 2 is that the two sealing plates 3 rotate in opposite directions. Specifically, the driving device 1 in this embodiment includes a servo motor whose forward and reverse rotation is controlled by a circuit, a motor output shaft 101 of the servo motor penetrates through two sealing plates 3, and the motor output shaft 101 and the sealing plates 3 are provided with threads that are used in cooperation with each other, and the threads on the two sealing plates 3 have opposite rotation directions. In this embodiment, the pitch of the thread on the output shaft 101 of the motor is the same as the distance between the two sealing plates 3 on the capsule 2. The distance between the motor output shaft 101 and the two sealing plates 3 is set, so that the tube sac 2 is rotated by 180 degrees and the compression of the tube sac 2 is completed, the state ensures the single pumping amount of the tube sac 2, and one end of the tube sac 2 is only rotated by half, thereby avoiding the excessive twisting turns of the tube sac 2 and the tight fit between the inner walls of the tube sac 2, and further frequently rubbing blood cells in the twisting process, thereby effectively reducing the compression of the tube sac 2 on the blood cells. Meanwhile, in the tube sac 2 in the embodiment, a soft corrugated tube is arranged between the threaded holes for penetrating through the motor output shaft 101 on the two sealing plates 3, namely, the soft corrugated tube is arranged to divide the inner cavity of the tube sac 2, so that the tube sac 2 is a circular column, the motor output shaft 101 is separated from blood, friction between the motor output shaft 101 and the sealing plates 3 and further damage blood cells caused by rotation of the motor output shaft 101 are avoided, and meanwhile, the sealing performance of the blood pump is ensured.

In the working state of the bionic blood pump in this embodiment, the motor output shaft 101 rotates to drive the two sealing plates 3 to rotate in opposite directions and move relatively on the motor output shaft 101, that is, the tube sac 2 is driven by the driving motor to rotate and compress itself, in this state, the one-way valve at the blood inlet port 301 is closed, and the one-way valve at the bleeding port 304 is opened, so that blood in the tube sac 2 can be pressed out; when the motor moves reversely, the two sealing plates 3 rotate in opposite directions and move in opposite directions, the one-way valve at the blood inlet port 301 is opened, the one-way valve at the blood outlet port 304 is closed, and blood in the human body can be pumped into the system.

Example 2

2 inner walls of capsule in this embodiment are provided with the bar arch 202, and the non-connection face of bar arch 202 is mutual overlap joint between cambered surface and two adjacent bar archs 202, and elastic memory alloy 201 wears to locate in the bar arch 202, makes capsule 2 in rotatory in-process through the cambered surface design, reduces the oppression to blood between the adjacent bar arch 202 as far as possible.

Example 3

The specific structure of the biomimetic blood pump described in this embodiment is substantially the same as the specific structure of the biomimetic blood pump described in embodiment 1, and the difference is that: the distance between two sealing plates 3 at the two ends of the tube bag 2 is N times of the thread pitch on the motor output shaft 101, the tube bag 2 in the device can be gathered at a single movement and the number of twisting turns can be increased through the structural design, and the single pumping quantity of the device can be increased.

Example 4

The specific structure of the biomimetic blood pump described in this embodiment is substantially the same as the specific structure of the biomimetic blood pump described in embodiment 1, and the difference is that: two sealing plates 3 at two ends of the tube bag 2, wherein one sealing plate 3 is fixedly connected with the driving device 1, and the other sealing plate 3 is in threaded connection with the motor output shaft 101.

Example 5

The specific structure of the biomimetic blood pump described in this embodiment is substantially the same as the specific structure of the biomimetic blood pump described in embodiment 1, and the difference is that: the driving device 1 is a hydraulic mechanism mounted on one sealing plate 3, a piston rod 102 of the hydraulic mechanism is fixedly connected with the other sealing plate 3, and the blood inlet port 301 and the blood outlet port 304 are respectively located at the central positions of the sealing plates 3. The tube bag 2 is compressed through the expansion and contraction of the hydraulic rod, the elastic memory alloy 201 in the tube bag 2 in the embodiment is obliquely arranged relative to the length direction of the tube bag 2, namely, in the compression process of the tube bag 2, the elastic memory alloy 201 tube bag 2 is forced to rotate along the self oblique angle under the pressure of the vertical direction, and then the tube bag 2 is synchronously twisted.

Example 6

The specific structure of the biomimetic blood pump described in this embodiment is substantially the same as the specific structure of the biomimetic blood pump described in embodiment 4, and the difference is that: a plurality of pump blood vessels which can be wound with each other are arranged in the tube sac 2, wherein each pump blood vessel can be twisted spirally along the axis of the pump blood vessel, the pump blood vessels are wound with each other to form a blood vessel cluster, and the blood vessel cluster can be twisted spirally along the axis of the blood vessel cluster; the sealing plate 3 is of a hollow structure, a conical shunt 302 is arranged in a cavity of the sealing plate, the conical shunt 302 is fixed on the lower bottom surface of the cavity of the sealing plate 3, and through holes 303 are formed in the lower bottom surface of the cavity to be respectively connected with pump blood vessels in an abutting mode. The structure of the pump blood vessel in the embodiment is the structure of the capsule body 2 of the tube capsule in the embodiment 3, and the blood pumped into the blood pump is divided by arranging a plurality of pump blood vessels, so that firstly, the blood pressure is divided, and overlarge pressure in the twisting process of the single-cavity type pump capsule is avoided; and secondly, the multiple pump blood vessels are arranged, the diameter of the multiple pump blood vessels is smaller than that of the single-cavity type pump bag, and blood in the multiple pump blood vessels is easily pumped up in the twisting process.

Example 7

The specific structure of the bionic blood pump in this embodiment is substantially the same as that of the bionic blood pump in the above embodiments, and the difference is as follows: the pipeline and the driving device 1 are both wrapped by an outer bag, and blood conveying pipes are arranged at the blood inlet port 301 and the blood outlet port 304 and extend to the outside of the outer bag. The blood pump in the embodiment is more suitable for being externally arranged, the blood pump can be integrated into a whole through an external power supply or an internal power supply, and the device can be directly placed in a blood vessel to dredge blood at the front end and the rear end of a blood vessel incision as an internal blood pump, so that the device is suitable for an extracorporeal circulation system and can be used as a simple and convenient blood vessel bridging device in blood vessel operations such as blood vessel stripping.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.

Claims (9)

1. The utility model provides a bionic blood pump, includes the pipeline that supplies blood circulation and drive arrangement (1) for blood flow provides power, its characterized in that: the tube is formed by a pump bag with a bag-shaped structure, the pump bag comprises a tube bag (2) and sealing plates (3) positioned at two ends of the tube bag (2), wherein the tube bag (2) is twisted in a twist shape as a whole, a plurality of elastic memory alloys (201) are uniformly distributed in the wall of the tube bag (2), a blood inlet port (301) and a bleeding port (304) are respectively arranged on the two sealing plates (3), and one-way valves are respectively arranged at the blood inlet port (301) and the bleeding port (304); the driving device (1) is connected to the sealing plates (3) and drives the tube bag (2) to compress and/or twist through the sealing plates (3), the tube bag (2) is compressed along the length direction of the tube bag, and the twisting of the tube bag (2) is driven by the two sealing plates (3) to rotate in opposite directions.

2. A biomimetic blood pump as recited in claim 1, wherein: the capsule wall of the tube capsule (2) is made of flexible materials, the inner side face of the capsule wall is provided with strip-shaped protrusions (202), the non-connecting face of each strip-shaped protrusion (202) is an arc face, two adjacent strip-shaped protrusions (202) are mutually overlapped, and the elastic memory alloy (201) penetrates through the strip-shaped protrusions (202).

3. A biomimetic blood pump as recited in claim 2, wherein: the driving device (1) comprises a servo motor which is controlled by a circuit to rotate in the forward direction and the reverse direction, a motor output shaft (101) of the servo motor penetrates through the two sealing plates (3), threads which are matched with each other are arranged on the motor output shaft (101) and the sealing plates (3), and the rotating directions of the threads on the two sealing plates (3) are opposite; and a sealing sleeve is arranged between the threads of the two sealing plates (3), and a motor output shaft (101) penetrates through the sealing sleeve.

4. A biomimetic blood pump as recited in claim 3, wherein: and the two sealing plates (3) are provided with threads, and the rotating directions of the two threads on the two sealing plates (3) are opposite.

5. A biomimetic blood pump as recited in claim 3, wherein: one sealing plate (3) is fixedly connected with the driving device (1), and the other sealing plate (3) is in threaded connection with the motor output shaft (101).

6. A biomimetic blood pump as claimed in claim 4 or 5, wherein: the pitch of the thread on the motor output shaft (101) is the same as the distance between the two sealing plates (3).

7. The bionic blood pump according to claim 3, characterized in that the driving device (1) is a hydraulic mechanism mounted on one of the sealing plates (3), the piston rod (102) of the hydraulic mechanism is fixedly connected with the other sealing plate (3), and the blood inlet port (301) and the blood outlet port (304) are respectively positioned at the center of the sealing plate (3).

8. A biomimetic blood pump as recited in claim 7, wherein: a plurality of pump blood vessels which can be wound with each other are arranged in the tube sac (2), wherein each pump blood vessel can be twisted spirally along the axis of the pump blood vessel, the pump blood vessels are wound with each other to form a blood vessel cluster, and the blood vessel cluster can be twisted spirally along the axis of the blood vessel cluster; the sealing plate (3) is of a hollow structure, a conical shunt (302) is arranged in a cavity of the sealing plate, the conical shunt (302) is fixed on the lower bottom surface of the cavity of the sealing plate (3), and through holes (303) are formed in the lower bottom surface of the cavity to be respectively connected with the pump blood vessels in an abutting mode.

9. A biomimetic blood pump as recited in claim 1, wherein: the pipeline and the driving device (1) are both wrapped by an outer bag, and blood conveying vessels are arranged at the blood inlet port (301) and the blood outlet port (304) and extend to the outside of the outer bag.

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