CN219148995U

CN219148995U - Percutaneous intervention type blood pump

Info

Publication number: CN219148995U
Application number: CN202222554411.8U
Authority: CN
Inventors: 余洪龙; 杨东; 解尧; 冯雪峰; 罗磊; 叶润峰; 李亚; 解启莲
Original assignee: Anhui Tongling Bionic Technology Co Ltd
Current assignee: Anhui Tongling Bionic Technology Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2023-06-09
Anticipated expiration: 2032-09-26

Abstract

The utility model provides a percutaneous interventional blood pump capable of reducing trauma to human tissues and cells, wherein the distal end of a cannula extends into a ventricle, the proximal end of the cannula extends to an artery, a blood suction hole is formed in the wall of the cannula in the ventricle, a blood discharge hole is formed in the wall of the cannula at the artery, a piston is arranged in a lumen of the cannula, the piston is driven by power to reciprocate in the lumen of the cannula, and blood in the ventricle is introduced into the lumen of the cannula from the blood suction hole and discharged to the artery from the blood discharge hole. The piston forms a certain negative pressure in the process of moving from the distal end to the proximal end, blood in the heart chamber is sucked into the lumen of the sleeve, and meanwhile, the piston can squeeze the blood in the proximal cavity of the piston and discharge the blood from the blood discharge hole to the artery, so that the blood in the heart chamber is pumped into the aorta. The blood pump has a simple structure, only needs to be provided with a puncture hole on the body, has small trauma to body tissues and can not damage blood cells.

Description

Percutaneous intervention type blood pump

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a percutaneous interventional blood pump.

Background

According to world health organization surveys, the incidence of cardiovascular disease has continued to increase in recent years, with the majority of cardiovascular disease outcomes being heart failure. The current methods for treating Heart failure include medical treatment and mechanical assistance, and due to limitations of medical treatment, the mechanical assistance has rapidly developed in recent years into clinically common intraarterial balloon counterpulsation (IABP), tanmem Heart, image systems and the like. Intra-arterial balloon counterpulsation (IABP) is the driving of intra-arterial blood flow through filling balloons from the intervention of a long balloon into the artery. There are great limitations in relying on ventricular function for cardiogenic shock and acute heart failure. The Tandem Heart system consists of an inflow tube penetrating into a left atrium through a femoral vein, an external central pump and an outflow tube penetrating into a ventricle through the femoral artery, and establishes a left atrium-to-femoral artery drainage channel, and has the defects of large wounds at two places, complex operation and need for atrial septum puncture. The im system consists of a catheter which is punctured into the heart chamber through the femoral artery, the front end of the catheter is provided with a cage-shaped blood inflow port, an outflow port is arranged on the ascending artery, an axial flow pump is arranged between the inflow port and the outflow port, and ventricular blood is drained to the artery, and the defect is that the flow rate depends on the rotation speed of the pump, and the red blood cells and the like can be damaged by a high-speed rotating blade.

Disclosure of Invention

The object of the present utility model is to provide a percutaneous interventional blood pump capable of reducing trauma to human tissue and cells.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the percutaneous interventional blood pump comprises a sleeve, wherein the distal end of the sleeve extends into a ventricle, the proximal end of the sleeve extends to an artery, a blood suction hole is formed in the wall of the sleeve in the ventricle, a blood discharge hole is formed in the wall of the sleeve in the artery, a piston is arranged in a tube cavity of the sleeve, and a power driving piston reciprocates in the tube cavity of the sleeve, so that blood in the ventricle is introduced into the tube cavity from the blood suction hole and discharged to the artery from the blood discharge hole.

The piston is in a circular ring shape, the outer wall of the piston is in sealing fit with the inner wall of the sleeve, a one-way valve clack is arranged in a middle through hole of the piston, and the conduction direction of the one-way valve clack is from a ventricular segment to an arterial segment.

The ventricular section sleeve is characterized in that a distal sealing film is arranged on the inner wall of the ventricular section sleeve, the distal sealing film covers the region where the blood suction hole is located, a plurality of through holes are formed in the distal sealing film, the through holes are arranged in a staggered mode with the blood suction hole, a proximal sealing film is also coated on the outer wall of the arterial section sleeve, the proximal sealing film covers the region where the blood discharge hole is located, a plurality of through holes are formed in the proximal sealing film, the through holes are arranged in a staggered mode with the blood discharge hole, when the piston sucks, the distal sealing film is separated from the inner wall of the sleeve, the proximal sealing film is separated from the outer wall of the sleeve, blood sequentially flows through the blood suction hole, the through holes in the distal sealing film, the blood discharge hole and the through holes in the proximal sealing film, and when the piston is stamped, the distal sealing film is attached to the inner wall of the sleeve and the proximal sealing film is attached to the outer wall of the sleeve.

The piston is circular or cylindrical with an outer diameter smaller than the sleeve.

The piston begins to stroke at ventricular end-diastole, at ventricular end-systole/early diastole.

The blood suction holes are uniformly and alternately arranged on the sleeve of the ventricular section along the circumferential direction, and the blood discharge holes are uniformly and alternately arranged on the sleeve of the arterial section along the circumferential direction.

The distal end of the sleeve is also fixed with a pigtail, and the proximal end of the sleeve is fixedly connected with the catheter.

The included angle between the ventricular section and the arterial section of the sleeve is 135-155 degrees.

The periphery of the blood suction hole of the sleeve is also covered with a filter screen which allows blood to pass through and blocks tissues from passing through.

In the above-mentioned solution, the piston forms a certain negative pressure during the movement from the distal end to the proximal end (i.e. the suction process), and sucks the blood in the ventricle into the lumen of the cannula, while the piston presses the blood in the proximal chamber of the piston and is discharged from the blood discharge hole to the artery, thus circulating and pumping the blood in the ventricle into the aorta. The blood pump has the advantages of simple structure, enhanced reliability, small trauma to body tissues and no damage to blood cells, and only needs to be provided with a puncture hole on the body.

Drawings

FIG. 1 is a schematic view of a blood pump in use;

FIG. 2 is a schematic diagram of the overall structure of the blood pump;

FIG. 3 is a cross-sectional view showing the mating of the piston and sleeve of example 1;

fig. 4 illustrates the sleeve and proximal seal membrane of example 2. Schematic mating of the distal sealing membrane.

Detailed Description

For ease of understanding, we first define the orientations referred to hereinafter: "proximal", "proximal" refers to the side proximal to the operator/physician and "distal" refers to the side distal to the operator/physician, i.e., the side proximal to the heart, as discussed in further detail below in connection with fig. 1-4.

The percutaneous interventional blood pump comprises a sleeve 10, wherein the distal end of the sleeve 10 extends into a ventricle, the proximal end of the sleeve 10 extends to an artery, a blood suction hole 11 is formed in the wall of the sleeve 10 in the ventricle, a blood discharge hole 12 is formed in the wall of the sleeve 10 in the artery, a piston 20 is arranged in the cavity of the sleeve 10, the sleeve 10 is made of a material with certain hardness and certain deformability, a power driving piston 20 reciprocates in the cavity of the sleeve 10, a driving device for providing power is preferably arranged outside the body, and the blood in the ventricle is introduced into the cavity of the sleeve 10 from the blood suction hole 11 and discharged to the artery from the blood discharge hole 12 according to the actual use condition and the production cost. The cannula 10 can be considered as a syringe in which the piston 20 creates a negative pressure during distal-to-proximal movement (i.e., aspiration) to draw blood from the chamber into the lumen of the cannula 10, while the proximal chamber of the piston 20 is reduced, the piston 20 compresses the blood in the proximal chamber of the piston 20 and is expelled from the blood evacuation port 12 toward the artery, and the blood in the chamber is pumped into the artery. Compared with the way of pumping blood by the impeller in the prior art, the utility model provides extra pumping energy for the ventricle through the reciprocating motion of the piston 20 so as to assist the pumping, thereby not forming shearing force on the blood and reducing the damage to various cells of the blood; meanwhile, the blood pump has a simple structure, the reliability is enhanced, and only a puncture hole is arranged on the body, so that the wound on the body tissue is small.

Example 1

As shown in fig. 3, the whole piston 20 is in a ring shape, the outer wall of the piston 20 is in sealing fit with the inner wall of the sleeve 10, a one-way valve clack 21 is arranged in a through hole in the middle of the piston 20, and the conduction direction of the one-way valve clack 21 is from a ventricular segment to an arterial segment. This prevents backflow of blood during the proximal to distal movement of the plunger 20 (i.e., the stamping process), and further improves the flow direction and efficiency of the blood pump.

Example 2

As shown in fig. 4, the inner wall of the ventricular section cannula 10 is provided with a distal sealing membrane 30, the distal sealing membrane 30 covers the region where the blood suction hole 11 is located, the "covering" means that the projection of the distal sealing membrane 30 on the cannula 10 is at least overlapped with the region where the blood suction hole 11 is located, preferably slightly larger than the region where the blood suction hole 11 is located, the distal sealing membrane 30 is provided with a plurality of through holes, the through holes are arranged in a staggered manner with respect to the blood suction hole 11, the outer wall of the arterial section cannula 10 is also covered with a proximal sealing membrane 40, the proximal sealing membrane 40 covers the region where the blood discharge hole 12 is located, the "covering" means that the projection of the proximal sealing membrane 40 on the cannula 10 is overlapped with at least the region where the blood discharge hole 12 is located, preferably slightly larger than the region where the blood discharge hole 12 is located, the proximal sealing membrane 40 is provided with a plurality of through holes, the through holes are arranged in a staggered manner with the blood discharge hole 12, the inside the chamber on the distal side of the piston 20 is subjected to negative pressure during the suction, the distal sealing membrane 30 is separated from the inner wall of the cannula 10, the chamber on the side of the piston 20 is separated from the inner wall of the cannula 10 by the proximal sealing membrane 20, the blood is subjected to the positive pressure of the blood flow through the proximal sealing membrane 40 is sequentially arranged on the inner wall of the blood discharge hole 12, and the blood is sequentially pumped through the proximal sealing membrane 40 and the blood chamber is separated from the inner wall of the chamber by the chamber is subjected to the positive pressure sealing membrane 40. When the piston 20 is stamped, the cavity at the far end side of the piston 20 is subjected to positive pressure, the far end sealing film 30 is attached to the inner wall of the sleeve 10, the cavity at the near end side of the piston 20 is subjected to negative pressure, the near end sealing film 40 is attached to the outer wall of the sleeve 10, and the through holes are arranged in a staggered mode with the blood suction hole 11 and the blood discharge hole 12, so that the blood suction hole 11 and the blood discharge hole 12 are respectively sealed by the far end sealing film 30 and the near end sealing film 40, internal blood of the sleeve 10 cannot be discharged, and the pumping efficiency of blood is further improved.

To ensure that blood can flow from the chamber on the distal side of the piston 20 into the chamber on the proximal side of the piston 20, the piston 20 is annular or cylindrical with an outer diameter smaller than the sleeve 10.

The piston 20 sucks at the end diastole of the ventricle and starts to punch at the end systole/early diastole of the ventricle, namely, an external driving device can perform suction and punching frequency adjustment according to the actual pulse frequency of a human body, so that the frequency is consistent with the diastole and contraction time of the heart, the external driving device needs to perform electrocardiographic gating, the rising branch R wave of the electrocardiogram triggers, namely, the rising period of the R wave starts to suck at the early systole of the ventricle, the T wave starts to suck at the early diastole of the ventricle, at the moment, the valve is closed and is discharged into the artery, the ventricular contraction process is simulated and synchronized, the ventricular pumping is assisted, and the ventricular preload is lightened.

In order to increase the flow rate of blood and to ensure uniformity of the drawn/discharged blood, the blood suction holes 11 are uniformly and intermittently provided in plurality on the sleeve 10 of the ventricular segment in the circumferential direction thereof, and the blood discharge holes 12 are uniformly and intermittently provided in plurality on the sleeve 10 of the arterial segment in the circumferential direction thereof.

Further, a pigtail 50 is also secured to the distal end of the cannula 10 for stabilizing the position of the blood pump in the heart, providing atraumatic support to the heart tissue, and the proximal end of the cannula 10 is fixedly connected to the catheter 60.

The included angle between the ventricular and arterial segments of the sleeve 10 is 135 deg. -155 deg.. According to the position relation between the heart and the aorta, the included angle between the ventricular segment and the arterial segment is determined, so that the sleeve 10 can be conveniently inserted into a blood vessel; of course, the different included angles are set according to different heart structures, and are not limited to the ranges and values listed in this embodiment.

In order to solve the above problem that some large pieces of human tissue are mixed in the blood and the inner cavity of the sleeve 10 is likely to be blocked if the human tissue enters the sleeve 10, a filter screen is further covered on the periphery of the blood suction hole 11 of the sleeve 10, and the filter screen allows the blood to pass and blocks the tissue from passing.

Claims

1. A percutaneous interventional blood pump comprising a cannula (10), characterized in that: the distal end of sleeve pipe (10) extends to the ventricle, the proximal end of sleeve pipe (10) extends to arterial department, offer blood suction hole (11) on sleeve pipe (10) pipe wall in the ventricle, offer blood discharge hole (12) on sleeve pipe (10) pipe wall in arterial department, be provided with piston (20) in the lumen of sleeve pipe (10), power drive piston (20) are in the intraductal reciprocating motion of sleeve pipe (10), introduce sleeve pipe (10) lumen with blood in the ventricle from blood suction hole (11) and discharge to the artery from blood discharge hole (12).

2. The percutaneous interventional blood pump of claim 1, wherein: the piston (20) is integrally annular, the outer wall of the piston (20) is in sealing fit with the inner wall of the sleeve (10), a one-way valve clack (21) is arranged in a middle through hole of the piston (20), and the conduction direction of the one-way valve clack (21) is from a ventricular segment to an arterial segment.

3. The percutaneous interventional blood pump of claim 1, wherein: be provided with distal end sealing membrane (30) on the inner wall of ventricular section sleeve pipe (10), distal end sealing membrane (30) cover blood suction hole (11) place region, a plurality of through-holes have been seted up on distal end sealing membrane (30), through-hole and blood suction hole (11) dislocation arrangement, also the cladding has proximal end sealing membrane (40) on the outer wall of arterial section sleeve pipe (10), proximal end sealing membrane (40) cover blood discharge hole (12) place region, a plurality of through-holes have been seted up on proximal end sealing membrane (40), through-hole and blood discharge hole (12) dislocation arrangement, when piston (20) are sucked, distal end sealing membrane (30) and sleeve pipe (10) inner wall separation, proximal end sealing membrane (40) and sleeve pipe (10) outer wall separation, blood flows through the through-hole on blood suction hole (11), distal end sealing membrane (30) in proper order, through-hole on blood discharge hole (12) and proximal end sealing membrane (40), when piston (20) punching press, distal end sealing membrane (30) laminating with sleeve pipe (10) inner wall, proximal end sealing membrane (40) laminating with sleeve pipe (10) outer wall.

4. A percutaneous interventional blood pump according to claim 3, wherein: the piston (20) is circular or cylindrical with an outer diameter smaller than the sleeve (10).

5. A percutaneous interventional blood pump according to claim 1 or 2 or 3, wherein: the piston (20) begins to stroke during end diastole and during end systole/very early diastole.

6. A percutaneous interventional blood pump according to claim 1 or 2 or 3, wherein: the blood suction holes (11) are uniformly and alternately arranged on the sleeve (10) of the ventricular segment along the circumferential direction, and the blood discharge holes (12) are uniformly and alternately arranged on the sleeve (10) of the arterial segment along the circumferential direction.

7. The percutaneous interventional blood pump of claim 1, wherein: the distal end of the sleeve (10) is also fixed with a pigtail (50), and the proximal end of the sleeve (10) is fixedly connected with the catheter (60).

8. The percutaneous interventional blood pump of claim 1 or 7, wherein: the included angle between the ventricular section and the arterial section of the sleeve (10) is 135-155 degrees.

9. The percutaneous interventional blood pump of claim 6, wherein: the periphery of the blood suction hole (11) of the sleeve (10) is also covered with a filter screen which allows blood to pass through and blocks tissues from passing through.