CN218833391U

CN218833391U - Auxiliary blood pumping catheter and blood pumping system

Info

Publication number: CN218833391U
Application number: CN202221888377.1U
Authority: CN
Inventors: 时勇; 林伟林; 李智鹏; 黎桂锋
Original assignee: Zhuhai Jindao Medical Technology Co ltd
Current assignee: Zhuhai Jindao Medical Technology Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-04-11
Anticipated expiration: 2032-07-21

Abstract

The utility model provides an auxiliary blood pumping conduit and a blood pumping system, wherein the auxiliary blood pumping conduit comprises an operation conduit, a driving conduit and a base part, and the operation conduit is provided with an accommodating channel; the driving catheter is telescopically inserted into the accommodating channel, the front end of the driving catheter protrudes out of the accommodating channel, the driving catheter is provided with a hollow channel, the front end of the driving catheter is provided with an inlet telescopic part, a blood pumping cavity telescopic part and an outlet telescopic part, the inlet telescopic part is provided with an inlet, the outlet telescopic part is provided with an outlet, a balloon is arranged in the blood pumping cavity telescopic part, the inside of the balloon is communicated with the hollow channel, the balloon can be repeatedly inflated and deflated, a blood pumping cavity is formed between the inner wall of the blood pumping cavity telescopic part and the outer wall of the balloon, and two ends of the blood pumping cavity are respectively communicated with the inlet and the outlet; the base part is arranged at the front end of the outlet expansion part; the blood pumping system comprises a driving device and an auxiliary blood pumping catheter, wherein the driving device can control the balloon to be repeatedly inflated and deflated. The utility model discloses can avoid causing the shearing, prevent thrombosis to blood.

Description

Auxiliary blood pumping catheter and blood pumping system

Technical Field

The utility model relates to the field of medical equipment, specifically relate to supplementary pump blood pipe and pump blood system.

Background

Heart failure is the terminal stage of the development of cardiovascular disease, characterized by the inability of the heart to pump enough blood and nutrients to meet the metabolic demands of the body. Heart failure has a lethality comparable to that of malignant tumors and has become a serious health problem worldwide. The current methods for treating heart failure mainly include drug therapy, cardiac resynchronization therapy, artificial hearts and heart transplantation. In recent years, with the increasing of cardiovascular diseases, artificial hearts have attracted much attention because they have a function of assisting patients with heart failure to pump blood from a normal heart, and thus can be used for long-term heart assistance or temporary transition when patients wait for heart transplantation.

The artificial heart is also called a heart pump, and is a mechanical device for assisting the heart to realize the whole body blood circulation. The basic principle is to replace the blood pumping function of the heart partially or completely by a bionic or mechanical method. Current heart pumps can be classified into extracorporeal, implantable, and interventional types, depending on the usage scenario. The operation of the in vitro type and the implanted type heart pump is complex, and the heart of the patient is greatly damaged. The interventional heart pump can be used for implanting a miniaturized heart pump in the aorta of a patient through a peripheral vascular interventional operation, thereby providing rapid and nondestructive circulatory assistance when the heart pump of the patient fails. The effect is more obvious for protecting the heart in the operation of high-risk coronary intervention operation and patients with cardiogenic shock caused by acute myocardial infarction. However, the current interventional heart pump mainly adopts an axial rotating blood pump to suck blood, which inevitably causes shearing to the blood and easily causes thrombosis.

SUMMERY OF THE UTILITY MODEL

The first purpose of the utility model is to provide an avoid causing the shearing, prevent the auxiliary pump blood pipe of thrombus formation to blood.

A second object of the present invention is to provide a blood pumping system comprising the above-mentioned auxiliary blood pumping conduit.

In order to achieve the first objective, the utility model provides an auxiliary pump blood conduit, which comprises an operation conduit, a driving conduit and a base part, wherein the operation conduit is provided with an accommodating channel along the axial direction thereof; the driving catheter is telescopically inserted into the accommodating channel, the front end of the driving catheter protrudes out of the front end of the accommodating channel, the driving catheter is provided with a hollow channel along the self axial direction, the outer side of the front end of the driving catheter is sequentially provided with an inlet telescopic part, a blood pumping cavity telescopic part and an outlet telescopic part along the self axial direction, the inlet telescopic part, the blood pumping cavity telescopic part and the outlet telescopic part can be retracted into the accommodating channel, the inlet telescopic part is provided with an inlet, the outlet telescopic part is provided with an outlet, a balloon is arranged in the blood pumping cavity telescopic part, the inner part of the balloon is communicated with the hollow channel, the balloon can be repeatedly inflated and deflated, a blood pumping cavity is formed between the inner wall of the blood pumping cavity telescopic part and the outer wall of the balloon, and two ends of the blood pumping cavity are respectively communicated with the inlet and the outlet; the base part is arranged at the front end of the outlet expansion part and can retract into the accommodating channel.

According to the scheme, the inlet and the outlet are respectively arranged at the two ends of the blood pumping cavity, so that when the saccule is shrunk, blood enters the blood pumping cavity from the inlet; when the saccule is inflated, the volume of the blood pumping cavity is squeezed, so that blood flows out of the outlet; the utility model discloses utilize inflating of sacculus and dwindle and order about the blood flow, realize the pump blood function, and can not cut blood, can avoid the formation of thrombus.

The blood pumping cavity telescopic part comprises a skeleton barrel and a sealing film, the skeleton barrel is made of shape memory materials, the skeleton is of a hollow cylindrical structure, the sealing film is wrapped on the outer circumferential wall of the skeleton barrel, and the sealing film can stretch and contract along with the skeleton barrel.

In a further proposal, a first membrane for preventing the blood from flowing backwards is arranged at the inlet of the framework cylinder, and a second membrane for preventing the blood from flowing backwards is arranged at the outlet of the framework cylinder.

By the scheme, the first membrane and the second membrane are arranged, so that the function of the one-way valve is formed at the inlet and the outlet, the blood flowing towards the inlet when the saccule is inflated is prevented, and the blood flowing towards the inside of the blood pumping cavity of the aorta when the saccule is deflated is prevented.

Still further, the balloon is arranged between the first membrane and the second membrane, and the rear end of the balloon is spaced from the second membrane by a preset distance.

According to the scheme, the preset distance is set, so that a space for containing blood is formed between the second membrane and the balloon, the volume of the space is gradually reduced along with the inflation of the balloon, the blood in the space can only flow towards the outlet direction, and the blood can be promoted to flow to the aorta from the outlet by each inflation.

The blood pump cavity expansion part comprises a plurality of first elastic support strips, the first elastic support strips are arranged along the circumferential direction of the driving guide pipe and connected to the driving guide pipe or the front end of the blood pump cavity expansion part, the interval between every two adjacent first elastic support strips is variable, and the inlet is arranged between every two adjacent first elastic support strips.

According to the scheme, when the inlet telescopic part is retracted into the accommodating channel, the inlet is closed when the plurality of first elastic supporting strips are tightly attached, and blood cannot enter the inlet at the moment; when the inlet expansion part extends out of the accommodating channel, the plurality of first elastic supporting strips automatically disperse, the inlet is opened, and blood can enter from the inlet.

The further scheme is that the outlet telescopic part comprises a plurality of second elastic support strips, the second elastic support strips are arranged along the circumferential direction of the driving guide pipe and connected to the driving guide pipe or the rear end of the pump blood cavity telescopic part, the interval between every two adjacent second elastic support strips is variable, and the outlet is arranged between every two adjacent second elastic support strips.

According to the scheme, when the outlet expansion part is retracted into the accommodating channel, the outlet is closed when the plurality of second elastic supporting strips are tightly attached, and blood cannot enter the outlet; when the outlet expansion part extends out of the accommodating channel, the plurality of second elastic supporting strips automatically disperse, the outlet is opened, and blood can enter from the outlet.

The further scheme is that the base part is made of shape memory materials, the base part is arranged to be an arc-shaped strip, the free end of the arc-shaped strip is close to the arc-shaped end of the connecting end of the arc-shaped strip, or a plurality of forking strips are arranged in the look of the front end of the base part, the fixed ends of the forking strips are connected together, and the free ends of the forking strips extend outwards.

According to the scheme, the base part is made of the shape memory material, so that the base part can be retracted into the accommodating channel and can automatically recover to the original shape after extending out of the accommodating channel, and heart tissues are prevented from being damaged; the arrangement of the arc-shaped strip and the bifurcating strip is used for preventing heart tissue from being damaged.

The front end of the driving conduit is connected with a base part, the driving conduit and the base part are arranged in a sealing way, or the base part is of a solid structure; the area of the driving catheter, which is positioned inside the balloon, is provided with a perforation, and the driving catheter is communicated with the inside of the balloon through the perforation.

In order to realize the second purpose, the utility model provides a pair of blood pumping system, including drive arrangement and foretell supplementary pump blood pipe, drive arrangement and the inside intercommunication of drive pipe, drive arrangement can control the sacculus and inflate repeatedly and reduce.

The further proposal is that the driving device can repeatedly inflate and exhaust the saccule, or the driving device can repeatedly supply and exhaust liquid to the saccule.

Drawings

Fig. 1 is a structural diagram of the auxiliary blood-pumping catheter according to the first embodiment of the present invention when the balloon is contracted.

Fig. 2 is a structural diagram of the balloon of the first embodiment of the auxiliary blood-pumping catheter of the present invention when it is inflated.

Fig. 3 is a view showing the configuration of the first embodiment of the auxiliary blood pumping catheter of the present invention in which the inlet expansion part is retracted into the receiving passage.

Fig. 4 is a structural view of the first embodiment of the auxiliary blood pumping catheter of the present invention, showing the inlet expansion part extending out of the receiving passage.

Fig. 5 is a structural diagram of a second embodiment of the auxiliary blood pumping catheter of the present invention.

Fig. 6 is a block diagram of an embodiment of the blood pumping system of the present invention.

The present invention will be further described with reference to the accompanying drawings and examples.

Detailed Description

First embodiment of auxiliary pump blood conduit:

referring to fig. 1 to 4, the auxiliary blood pumping catheter 10 provided in this embodiment includes an operation catheter 1, a driving catheter 2 and a base member 3, the operation catheter 1 is axially and communicatively provided with an accommodating channel 11 along itself, the driving catheter 2 is telescopically inserted into the accommodating channel 11, two ends of the driving catheter 2 respectively protrude two ends of the accommodating channel 11, and the base member 3 is disposed at a front end of the driving catheter 2.

The driving conduit 2 is provided with a hollow channel along the axial direction thereof, and the rear end of the hollow channel is communicated with an external driving device. An inlet expansion part 22, a blood pumping chamber expansion part 23a and an outlet expansion part 24 are arranged in sequence from front to back outside the front end of the drive catheter 2, the inlet expansion part 22 is provided with an inlet 221, and the outlet expansion part 24 is provided with an outlet. The inlet bellows 22, the blood pumping chamber bellows 23a and the outlet bellows 24 are each capable of retracting into and protruding out of the receiving channel 11. The balloon 25 is arranged in the blood pumping cavity expansion part 23a, the inside of the balloon 25 is communicated with the hollow channel, the driving device 20 supplies air or injects liquid to the balloon 25 through the hollow channel, so that the balloon 25 can be repeatedly inflated and deflated in the blood pumping cavity 26, and the contraction and expansion frequency of the balloon 25 is matched with the beating frequency of the heart to simulate the beating of heart blood. A blood pumping cavity 26 is formed between the inner wall of the blood pumping cavity expansion part 23a and the outer wall of the balloon 25, both ends of the blood pumping cavity 26 are respectively communicated with the inlet 221 and the outlet, and blood in the left ventricle enters from the inlet 221 and flows from the outlet to the aorta.

The blood pumping chamber expansion part 23a comprises a skeleton cylinder and a sealing film, the skeleton cylinder is made of a shape memory material, specifically, the skeleton cylinder can be made of a nickel-titanium wire through processes of weaving, heat treatment setting and the like, or the skeleton cylinder can be made of a nickel-titanium wire through processes of cutting, heat treatment setting, polishing and the like. The framework is of a hollow cylindrical structure, the diameters of two ends of the framework are equal, the sealing membrane wraps the outer peripheral wall of the framework barrel, and the sealing membrane can extend or contract along with the framework barrel. The sealing membrane may be made of PTFE, PET, silicone, TPU or a biological tissue membrane.

In order to prevent the blood from flowing reversely, the first membrane is arranged at the inlet 221 of the framework cylinder, one side of the first membrane is fixedly connected with the framework, the other side of the first membrane is adjacent to the framework, and the first membrane can only turn over towards the middle of the blood pumping cavity 26. The framework cylinder is provided with a second membrane for preventing blood from flowing reversely at an outlet, one side of the second membrane is fixedly connected with the framework, the other side of the second membrane is adjacent to the framework, and the second membrane can only turn over back to the middle of the blood pumping cavity 26. The first diaphragm and the second diaphragm are arranged to act as one-way valves, and can prevent blood from flowing reversely.

The sacculus 25 sets up between first diaphragm and the second diaphragm, and the interval preset distance between the rear end of sacculus 25 and the second diaphragm for form the space that holds blood between second diaphragm and the sacculus 25 tip, in the inflation process of sacculus 25, the volume in space dwindles gradually, forces the blood in the space to flow to the export direction, with the pressure that slows down blood along pumping blood cavity 26 radial flow, guarantees the volume of the blood that flows out from the export at every turn.

The base part 3 is arranged at the front end of the outlet expansion part 24, and the base part 3 can be retracted into the accommodating channel 11, so that the present embodiment can be conveniently extended into the heart chamber along the aorta 302. Base part 3 adopts shape memory material to make, and base part 3 establishes to the arc strip, and the link of arc strip is connected with drive pipe 2, and the free end of arc strip is close to its link arc. In order to prevent blood from entering the drive catheter 2, the drive catheter and the base member are sealed or the base member is solid, for example, the curved strip of the present embodiment is solid. In other embodiments, the base member may be provided with other configurations, for example, the front end of the base member is provided with a plurality of bifurcating bars, respective fixed ends of the plurality of bifurcating bars are connected together, and respective free ends of the plurality of bifurcating bars are free to extend outward. The base part can stretch out and retract into the accommodating channel, and can automatically stretch out to the original state after stretching out of the accommodating channel.

The driving catheter 2 is provided with a plurality of perforations 27 in the area inside the balloon 25, the perforations 27 are arranged along the axial direction of the driving catheter 2, and the driving catheter 2 is communicated with the inside of the balloon 25 through the perforations 27.

The inlet telescoping section 22 includes a plurality of first elastic support bars 222, and the plurality of first elastic support bars 222 are arranged in a circumferential array along the drive duct 2. One end of the first elastic supporting strip 222 is connected to the front end of the framework cylinder or the driving conduit 2, and the other end of the first elastic supporting strip 222 extends outward in a spreading manner, so that the framework cylinder can be contracted to drive the plurality of first elastic supporting strips 222 to be folded, as shown in fig. 1 and 2. In other embodiments, both ends of the first elastic support bar 222 are connected to the driving duct 2, as shown in fig. 3 and 4, the inlet expansion part 22 is formed in a structure having small ends and a large middle part, and the middle part of the first elastic support bar 222 is connected to the inside of the frame tube.

The interval between two adjacent first elastic support bars 222 is variable, and the inlet 221 is disposed between two adjacent first elastic support bars 222.

The outlet telescoping section 24 comprises a plurality of second resilient support strips arranged in a circumferential array along the drive conduit 2. One end of the second elastic supporting strip is connected to the driving conduit 2, the other end of the second elastic supporting strip is connected to the rear end of the framework cylinder, and the plurality of second elastic supporting strips can drive the framework cylinder to shrink together when being folded, as shown in fig. 1 and 2. In other embodiments, both ends of the second elastic supporting strip are connected to the driving duct 2, as shown in fig. 3 and 4, the outlet expansion part forms a structure with small ends and a large middle part, and the middle part of the second elastic supporting strip is connected to the inner side of the framework cylinder.

The interval between two adjacent second elastic support bars is variable, and the outlet is arranged between the two adjacent second elastic support bars.

Second embodiment of auxiliary pump blood conduit:

referring to fig. 5, the structure of the blood pumping chamber expansion part 23b of the present embodiment is changed based on the structure of the first embodiment of the auxiliary blood pumping catheter. Specifically, a funnel portion 232 is provided at the front end of the frame tube, and the diameter of the funnel portion 232 gradually narrows toward the inlet expansion portion 22. The funnel part 232 can reduce the space at the front end of the blood pumping cavity, so that blood entering the blood pumping cavity is gathered at the middle end and the rear end of the blood pumping cavity more, when the balloon 25 is inflated, the blood can be promoted to flow to the outlet of the outlet expansion part 24, and the pressure on the first diaphragm can be reduced.

Blood pumping system embodiment:

referring to fig. 6 in combination with fig. 1 and 2, the blood pumping system includes a driving device 20 and the blood pumping balloon catheter 10 of the above embodiment, the driving device 20 is communicated with the driving catheter 2, and the driving device 20 can control the balloon 25 to be repeatedly inflated and deflated. Specifically, the method comprises the following steps: the drive device 20 can repeatedly inflate and deflate the balloon 25, or the drive device 20 can repeatedly supply and evacuate fluid to the balloon 25.

The auxiliary blood pumping catheter 10 is placed in the left ventricle 301 along the aorta 302, after the auxiliary blood pumping catheter 10 is moved to the right position, before blood pumping, the control base component 3, the inlet expansion part 22, the blood pumping cavity expansion part 23a/23b and the outlet expansion part 24 protrude out of the front end of the operation catheter 1, at the moment, the base component 3 is abutted to the apex of the heart, the inlet expansion part 22 is located in the left ventricle 301, the blood pumping cavity expansion part 23a/23b penetrates through the aortic valve 303, the outer peripheral wall of the blood pumping cavity expansion part 23a/23b is attached to the aortic valve 303, and the outlet expansion part 24 is located in the aorta 302. When the heart 30 is in diastole, blood flows from the left atrium to the left ventricle 301, the driving device 20 controls the balloon 25 to contract, and at this time, the blood in the left ventricle 301 enters the blood pumping cavity 26 from the inlet 221 of the inlet expansion part 22; when heart 30 contracts, drive mechanism 20 controls inflation of balloon 25, causing blood in pumping chamber 26 to flow from the outlet to aorta 302.

In summary, the utility model has the advantages that the inlet and the outlet are respectively arranged at the two ends of the blood pumping cavity, and when the saccule shrinks, blood enters the blood pumping cavity from the inlet; when the saccule is inflated, the volume of the blood pumping cavity is squeezed, so that the blood flows out from the outlet; the utility model discloses utilize inflating of sacculus and dwindle and order about the blood flow, realize the pump blood function, and can not cut blood, can avoid the formation of thrombus.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, and are not intended to limit the scope of the present invention, as those skilled in the art will appreciate that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications, equivalents, and improvements as fall within the true spirit and scope of the invention.

Claims

1. An auxiliary pump blood conduit, comprising:

the operation conduit is provided with an accommodating channel along the axial direction of the operation conduit in a communication manner;

the driving catheter is telescopically inserted into the accommodating channel, the front end of the driving catheter protrudes out of the front end of the accommodating channel, the driving catheter is provided with a hollow channel along the self axial direction, the outer side of the front end of the driving catheter is sequentially provided with an inlet telescopic part, a blood pumping cavity telescopic part and an outlet telescopic part along the self axial direction, the inlet telescopic part, the blood pumping cavity telescopic part and the outlet telescopic part can be retracted into the accommodating channel, the inlet telescopic part is provided with an inlet, the outlet telescopic part is provided with an outlet, a balloon is arranged in the blood pumping cavity telescopic part, the interior of the balloon is communicated with the hollow channel, the balloon can be repeatedly inflated and deflated, a blood pumping cavity is formed between the inner wall of the blood pumping cavity telescopic part and the outer wall of the balloon, and two ends of the blood pumping cavity are respectively communicated with the inlet and the outlet;

and the base part is arranged at the front end of the outlet expansion part and can retract into the accommodating channel.

2. The auxiliary pump blood conduit of claim 1, wherein:

the blood pumping cavity telescopic part comprises a skeleton barrel and a sealing membrane, the skeleton barrel is made of a shape memory material, the skeleton is of a hollow cylindrical structure, the sealing membrane is wrapped on the outer peripheral wall of the skeleton barrel, and the sealing membrane can extend and contract along with the skeleton barrel.

3. The auxiliary pump blood conduit of claim 2, wherein:

the framework cylinder is provided with a first membrane for preventing blood from flowing backwards at the inlet, and the framework cylinder is provided with a second membrane for preventing blood from flowing backwards at the outlet.

4. The auxiliary pump blood conduit of claim 3, wherein:

the sacculus is arranged between the first diaphragm and the second diaphragm, and the rear end of the sacculus and the second diaphragm are separated by a preset distance.

5. The auxiliary pump blood conduit of claim 1, wherein:

the flexible portion of entry includes a plurality of first elastic support strips, and is a plurality of first elastic support strip is followed the circumference of drive pipe is arranged and is arranged, first elastic support strip is connected on the drive pipe or connect the front end of the flexible portion in pump blood chamber, adjacent two interval between the first elastic support strip is variable, the entry sets up adjacent two between the first elastic support strip.

6. The auxiliary pump blood conduit of claim 1, wherein:

the flexible portion of export includes a plurality of second elastic support strips, and is a plurality of the second elastic support strip is followed the circumference of drive pipe is arranged and is arranged, the second elastic support strip is connected on the drive pipe or connect the rear end of the flexible portion in pump blood chamber, and the interval between two adjacent second elastic support strips is variable, the export setting is adjacent two between the second elastic support strip.

7. The auxiliary pump blood conduit of claim 1, wherein:

the base part adopts shape memory material to make, the base part is established to the arc strip, the free end of arc strip is close to its link arc, perhaps, there are a plurality of branches strip in the base part's front end look, and is a plurality of the stiff end separately of branch strip links together, and is a plurality of the free end separately of branch strip outwards extends.

8. The auxiliary pump blood conduit of claim 1, wherein:

the front end of the driving conduit is connected with the base part, and the driving conduit and the base part are plugged, or the base part is of a solid structure;

the area of the driving catheter, which is positioned in the balloon, is provided with a perforation, and the driving catheter is communicated with the inside of the balloon through the perforation.

9. A blood pumping system, characterized by: the auxiliary blood pumping catheter comprises a driving device and the auxiliary blood pumping catheter of any one of the claims 1 to 8, wherein the driving device is communicated with the interior of the driving catheter, and the driving device can control the balloon to be repeatedly inflated and deflated.

10. The blood pumping system of claim 9, wherein:

the driving device can repeatedly inflate and deflate the balloon, or the driving device can repeatedly supply liquid and pump liquid to the balloon.