CN216456525U - Supporting device for blood pump and auxiliary blood circulation system - Google Patents

Abstract

The utility model provides a supporting device for a blood pump and an auxiliary blood circulation system, wherein the supporting device for the blood pump comprises: a stent comprising a helical structure helically shaped around a base wire according to a helix, the stent being radially expandable for anchoring at a predetermined location in a blood vessel; the blood pump comprises a shell, a rotating shaft and an impeller, wherein the far end of the shell is connected with the near end of the support, the impeller is arranged at the far end of the rotating shaft, the rotating shaft and the impeller are contained in the shell, and the rotating shaft rotates to drive the impeller to rotate. According to the configuration, the blood pump can be fixed in the blood vessel by arranging the stent with the spiral structure with the radial expansion characteristic, compared with the prior art that the stent is contacted with the inner wall of the blood vessel through the gasket, the stent has a larger contact area with the wall of the blood vessel after being radially expanded, so that the blood pump and the blood vessel are better in fixing effect, the blood pump can be fixed in the blood vessel more stably through the stent, and the axial movement and the radial deflection of the blood pump in the blood vessel are avoided.

Description

Supporting device for blood pump and auxiliary blood circulation system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a supporting device for a blood pump and an auxiliary blood circulation system.

Background

The heart disease is the first killer of human beings, various heart diseases are finally manifested as heart failure, which is mainly manifested in that the heart loses the function of pumping blood or has weaker function of pumping blood, at present, no simple and efficient method for treating the heart failure at the late stage is available, only two surgical treatment methods of heart transplantation and artificial heart are most effective, and the heart transplantation is severely restricted by donor sources and becomes a symbolic technology, so that the artificial heart becomes the last hope of saving lives of most of heart failure patients. The artificial heart is called a "blood pump" for short, and includes a fully artificial heart and an auxiliary artificial heart (or called a "ventricular assist device"), and several products of auxiliary blood pumps have been clinically approved in the world at present, and are widely applied in the clinic.

At present most blood pumps are implanted into the body of a patient to work, for an implantable blood pump, the blood pump can normally work after the blood pump is usually fixed at a specified position of a blood vessel wall by arranging a corresponding fixing part, and if the fixing effect of the fixing part on the position of the blood pump is not ideal, secondary injury can be caused to the patient. In the prior art, adopt a bracing piece to be fixed in the assigned position of vascular wall with the blood pump usually, specifically, the near-end and the blood pump connection of bracing piece, the distal end of bracing piece is provided with the gasket, and the gasket is direct and the contact of blood vessel inner wall, and the purpose of bracing piece with blood pump position fixing is realized to the contact of accessible gasket and blood vessel inner wall like this. However, in the prior art, the contact area between the gasket and the blood vessel wall is relatively small, and the gasket is easy to move in the blood vessel along the axial direction of the support rod and deflect in the blood vessel along the radial direction of the support rod, so that the blood pump moves axially and deflects radially in the blood vessel, the blood pump deviates from the specified position of the blood vessel wall, and the fixing effect of the blood pump is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a supporting device for a blood pump and an auxiliary blood circulation system, and aims to solve the problems that the blood pump is easy to move axially and deflect radially in a fixing mode of the blood pump in a blood vessel wall in the prior art, and the fixing effect of the blood pump is not ideal.

To solve the above technical problems, according to one aspect of the present invention, there is provided a support device for a blood pump, comprising:

a stent comprising a helical structure helically shaped around a base wire according to a helix, the stent being radially expandable for anchoring at a predetermined location in a blood vessel;

the blood pump comprises a shell, a rotating shaft and an impeller, wherein the far end of the shell is connected with the near end of the support, the impeller is arranged at the far end of the rotating shaft, the rotating shaft and the impeller are contained in the shell, and the rotating shaft rotates to drive the impeller to rotate.

Optionally, the pitch of the distal portion of the stent is less than the pitch of the proximal portion of the stent.

Optionally, when the stent is restricted from radial expansion by a sheath, a projection of the housing on a reference plane along the direction of the baseline is a first projection, a projection of the stent on the reference plane along the direction of the baseline is a second projection, and the first projection is within a range of the second projection.

Optionally, after the stent is radially expanded, the cross-sectional area of the stent decreases in the direction from the distal end to the proximal end.

Optionally, the support device for the blood pump includes a flexible transmission shaft, the flexible transmission shaft is parallel to the base line, and the flexible transmission shaft is fixedly connected with the blood pump.

Optionally, the distal end of the helical wire is fixed to the formed helical structure, or the distal end of the helical wire is provided with an elastic member.

Optionally, the proximal end of the helical wire is integrally formed with the housing.

Optionally, the housing is provided with a window penetrating through the side wall; the impeller is located at a fenestration of the housing.

According to another aspect of the present invention, there is also provided an auxiliary blood circulation system comprising:

a support device for a blood pump as described above;

a delivery device for detachably connecting with the supporting device for the blood pump and for carrying the supporting device for the blood pump to intervene in a blood vessel.

Optionally, the delivery device comprises a sheath for receiving the support means for the blood pump and limiting radial expansion of the stent.

In summary, in the supporting device for a blood pump and the auxiliary blood circulation system provided by the present invention, the supporting device for a blood pump includes: a stent comprising a helical structure helically shaped around a base wire according to a helix, the stent being radially expandable for anchoring at a predetermined location in a blood vessel; the blood pump comprises a shell, a rotating shaft and an impeller, wherein the far end of the shell is connected with the near end of the support, the impeller is arranged at the far end of the rotating shaft, the rotating shaft and the impeller are contained in the shell, and the rotating shaft rotates to drive the impeller to rotate. According to the configuration, the blood pump can be fixed in the blood vessel by arranging the stent with the spiral structure with the radial expansion characteristic, compared with the prior art that the stent is contacted with the inner wall of the blood vessel through the gasket, the stent has a larger contact area with the wall of the blood vessel after being radially expanded, so that the blood pump and the blood vessel are better in fixing effect, the blood pump can be fixed in the blood vessel more stably through the stent, the axial movement and the radial deflection of the blood pump in the blood vessel are avoided, and the blood pump is ensured to be coaxially arranged with the blood vessel under the action of the stent.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the utility model and do not constitute any limitation to the scope of the utility model. Wherein:

FIG. 1 is a schematic view of a support device for a blood pump in a blood vessel according to an embodiment of the present invention;

FIG. 2 is an exploded view of a blood pump according to an embodiment of the present invention;

fig. 3 is a schematic view of a support device for a blood pump in a sheath according to an embodiment of the present invention.

In the drawings:

10-a scaffold;

20-blood pump; 21-a housing; 210-windowing; 22-an impeller; 23-a rotating shaft;

30-a blood vessel;

40-sheath tube;

50-a flexible drive shaft;

h-baseline.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, which include not only the end points, but also the terms "mounted", "connected" and "connected" should be understood broadly, e.g., as a fixed connection, as a detachable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The utility model provides a supporting device for a blood pump and an auxiliary blood circulation system, and aims to solve the problems that the fixing mode of the blood pump in a blood vessel wall in the prior art easily causes axial movement and radial deflection of the blood pump, and the fixing effect of the blood pump is not ideal.

The supporting device for a blood pump according to the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1, fig. 1 is a schematic view of a support device for a blood pump in a blood vessel according to an embodiment of the present invention, and the present embodiment provides a support device for a blood pump, which includes: a stent 10 and a blood pump 20, the stent 10 comprising a helical structure helically wound around a base line H according to a helical line, the stent 10 being radially expandable for anchoring at a predetermined position of a blood vessel 30, the stent 10 extending in a helical direction thereof and being substantially tubular, the stent 10 being radially expanded to abut against an inner wall of the blood vessel 30 and to be fixed to the inner wall of the blood vessel 30 under the action of a radially expanding force; further, referring to fig. 2, fig. 2 is an exploded view of a blood pump according to an embodiment of the present invention, the blood pump 20 is used for sucking blood, the structure of the blood pump 20 may specifically include a housing 21, a rotating shaft 23 and an impeller 22, a distal end of the housing 21 is connected to a proximal end of the support 10, the impeller 22 is disposed at a distal end of the rotating shaft 23, the rotating shaft 23 and the impeller 22 are accommodated in the housing 21, and the rotating shaft 23 rotates (the rotating shaft 23 rotates around its central axis) to drive the impeller 22 to rotate. It is understood that radial expansion of the stent 10 refers to the stent 10 expanding radially outward on itself so that the cross-sectional area of the stent 10 increases, and further understood that the stent 10 expands toward the direction perpendicular to and away from the baseline H, and in contrast, the stent 10 may also have the property of radially contracting, and that radial contraction of the stent 10 refers to the stent 10 contracting radially inward on itself so that the cross-sectional area of the stent 10 decreases, and further understood that the stent 10 contracts toward the direction perpendicular to and close to the baseline H. The stent 10 is attached to the vessel wall after being radially expanded, has a large attachment area, and is firmly fixed with the vessel 30 under the action of the radial expansion force, so that the blood pump 20 can be fixed in the vessel 30 through the stent 10, the blood pump 20 is prevented from axially moving and radially deflecting in the vessel 30, and the blood pump 20 assists the heart of the patient to stably do work. It should be noted that the baseline H is only used for supplementary explanation, and does not limit the present invention in any way.

Specifically, with continued reference to fig. 2, the blood pump of the present embodiment extends substantially along the direction of the baseline H, and accordingly, it can be seen that the housing 21 is substantially cylindrical along the baseline H, the axial direction of the housing 21 is substantially parallel to the axial direction of the blood vessel 30, and the central axis of the rotating shaft 23 is substantially coincident with the central axis of the housing 21, and may further coincide with the baseline H. Referring to fig. 2, the distal end of the casing 21 further has at least one opening 210 penetrating the sidewall, the planar shape of the opening 210 is not limited, and after the impeller 22 is accommodated in the casing 21 along with the rotating shaft 23, the impeller 22 is disposed at the opening 210. Referring to fig. 1, the blood flow direction in this embodiment may be specifically set to be a direction from the distal end to the proximal end, and actually, the rotation shaft 23 rotates to drive the impeller 22 to rotate so as to generate power in the blood flow direction, so as to suck blood from the ventricle and flow out from the fenestration 210 of the housing 21 (specifically referring to the direction shown in fig. 1), so that the impeller 22 can help the heart to do work to treat the heart failure. A motor connected to the rotating shaft 23 is generally provided to rotate the rotating shaft 23, that is, the motor transmits torque to the impeller 22 through the rotating shaft 23. It should be noted that the motor may be disposed outside the patient, or may be disposed inside the patient, which is not limited in the present invention.

In this embodiment, the material of the support 10 with a spiral structure may be a metal elastic member or a polymer elastic member. The material of the housing 21 may preferably be the same as the material of the spiral structure, so that the proximal end of the stent 10 and the distal end of the housing 21 are integrally formed, and the integral structure is more stable, so that the stent 10 and the blood pump 20 are not easily separated, and of course, in other embodiments, the stent 10 and the housing 21 may be formed separately, and then the proximal end of the stent 10 and the distal end of the housing 21 are connected, including but not limited to, process connection, welding, bonding, and the like.

In addition, the utility model also provides an auxiliary blood circulation system, which comprises the supporting device for the blood pump and a conveying appliance detachably connected with the supporting device for the blood pump, wherein the conveying appliance can carry the supporting device for the blood pump to intervene in a blood vessel 30 and can also control the radial expansion or radial contraction of the stent 10. In particular, the delivery device is connected to a support device for a blood pump and drives the support device for the blood pump to implant into the blood vessel 30, whereupon the stent 10 is released, controlling the stent 10 to transition from a radially contracted state to a radially expanded state, so as to be anchored against the inner wall of the blood vessel 30. After anchoring the stent 10 against the blood vessel 30, the blood pump 20 is released further into the blood vessel 30, and finally the delivery device is separated from the support device for the blood pump and removed from the patient. Alternatively, if the stent 10 is not in good abutment with the vessel 30 after being radially expanded, or if the stent 10 is not yet in abutment with the vessel 30 at a predetermined position, the operator may control the stent 10 to be shifted from the radially expanded state to the radially contracted state, and then release the stent 10 again under the control of the delivery device. If the implantation effect of the supporting device for the blood pump is not ideal, the supporting device for the blood pump can be withdrawn from the body of the patient through the conveying appliance.

Further, referring to fig. 3, fig. 3 is a schematic view of a sheath tube of a support device for a blood pump according to an embodiment of the present invention, and the delivery device includes a sheath tube 40, wherein the sheath tube 40 is used for accommodating the support device for the blood pump and limiting the radial expansion of the stent 10. Specifically, the support device for the blood pump is housed in the sheath 40 (including but not limited to the stent 10 and the blood pump 20 both housed in the sheath 40), and as the sheath 40 is implanted in the patient and inserted into the blood vessel 30, the stent 10 is restricted from radial expansion by the sheath 40, i.e., the stent 10 is housed in the sheath 40 in a radially contracted state. The physician controls the detachment of the stent 10 from the sheath 40 and the release thereof to a predetermined location in the blood vessel 30 by manipulating the relevant components of the delivery instrument, thereby disengaging the blood pump 20 from the sheath 40, and correspondingly, controls the sequential withdrawal of the blood pump 20 and the stent 10 into the sheath 40 by manipulating the relevant components of the delivery instrument.

Preferably, the pitch of the distal portion of the stent 10 is smaller than the pitch of the proximal portion of the stent 10. It will be understood that the pitch here refers to the distance between two adjacent helices in the extreme direction of the helically structured stent 10. As configured above, the pitch of the distal portion of the stent 10 is small, so that the density of the spiral line of the distal portion of the stent 10 is large, which is beneficial for the stent 10 to be in close contact with the tube wall of the blood vessel 30, and provides effective inner wall support, and the pitch of the proximal portion of the stent 10 is large, so that the density of the spiral line of the proximal portion of the stent 10 is small, which can provide an effective space between the blood pump 20 (which can be specifically the shell 21) and the tube wall of the blood vessel 30, and is also beneficial for being recovered into the sheath tube 40 after the operation.

Preferably, the free end of the helical line (the free end refers to the distal end of the helical line, i.e. the upper end of the helical line in fig. 3) of the stent 10 of the helical structure of the present embodiment is subjected to a fixing process or a smoothing process, for example, the free end of the helical line is fixed (e.g. welded) on the helical structure which has been formed, for example, the free end of the helical line is configured into a smooth curved surface shape, for example, an elastic member (preferably a spherical elastic member) may be configured at the free end of the helical line, and the material of the elastic member may be, for example, silicone rubber. As above, the free end of the helical line can be prevented from having a sharp-pointed structure, which is beneficial to reduce the damage of the free end of the helical line to the wall of the blood vessel 30 during the radial expansion of the stent 10.

Further, the support device for the blood pump comprises a flexible transmission shaft 50, the axis of the flexible transmission shaft 50 is parallel to the base line H, preferably the central axis of the flexible transmission shaft 50 is coincident with the base line H, the flexible transmission shaft 50 is fixedly connected with the blood pump 20, so that the position of the blood pump 20 and the stent 10 in the blood vessel 30 can be adjusted by pulling the flexible transmission shaft 50.

Preferably, when the stent 10 is constrained by a sheath 40 to expand radially, i.e. when the stent 10 is accommodated in the sheath 40 in a radially contracted configuration, a projection of the housing 21 on a reference plane along the direction of the baseline H is a first projection, and a projection of the stent 10 on the reference plane along the direction of the baseline H is a second projection, and the first projection is within the range of the second projection. It is understood that the reference plane is used herein for supplementary explanation only, and the reference plane is perpendicular to the baseline H. As can be further appreciated from the above, the cross-sectional area of the housing 21 is less than the cross-sectional area of the stent 10 when the stent 10 and blood pump 20 are positioned within the sheath 40, or the periphery of the housing 21 is within the periphery of the stent 10. With the above configuration, when the stent 10 and the blood pump 20 are recovered in the sheath 40, since the first projection is within the range of the second projection, a gap can be ensured between the housing 21 and the tube wall of the sheath 40, which is beneficial to reducing the frictional resistance between the stent 10 and the blood pump 20 and the sheath 40 during the delivery or recovery process, and is convenient for the surgical operation.

Preferably, after the stent 10 is radially expanded, the cross-sectional area of the stent 10 decreases from the distal end to the proximal end in sequence, so that the cross-sectional area of the proximal portion of the stent 10 is smaller than that of the distal portion of the stent 10, the distal portion of the stent 10 is ensured to be anchored and attached to the wall of the blood vessel 30, and a gap is formed between the proximal portion of the stent 10 and the wall of the blood vessel 30, so that the stent 10 is prevented from being completely attached to the wall of the blood vessel 30 after being radially expanded, and the position of the stent 10 is prevented from being adversely affected by subsequent adjustment.

In summary, in the supporting device for a blood pump and the auxiliary blood circulation system provided by the present invention, the supporting device for a blood pump includes: a stent comprising a helical structure helically shaped around a base wire according to a helix, the stent being radially expandable for anchoring at a predetermined location in a blood vessel; the blood pump comprises a shell, a rotating shaft and an impeller, wherein the far end of the shell is connected with the near end of the support, the impeller is arranged at the far end of the rotating shaft, the rotating shaft and the impeller are contained in the shell, and the rotating shaft rotates to drive the impeller to rotate. According to the configuration, the blood pump can be fixed in the blood vessel by arranging the stent with the spiral structure with the radial expansion characteristic, compared with the prior art that the stent is contacted with the inner wall of the blood vessel through the gasket, the stent has a larger contact area with the wall of the blood vessel after being radially expanded, so that the blood pump and the blood vessel are better in fixing effect, the blood pump can be fixed in the blood vessel more stably through the stent, the axial movement and the radial deflection of the blood pump in the blood vessel are avoided, and the blood pump is ensured to be coaxially arranged with the blood vessel under the action of the stent.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art according to the above disclosure are within the scope of the present invention.

Claims (10)

1. A support device for a blood pump, comprising:

a stent comprising a helical structure helically shaped around a base wire according to a helix, the stent being radially expandable for anchoring at a predetermined location in a blood vessel;

the blood pump comprises a shell, a rotating shaft and an impeller, wherein the far end of the shell is connected with the near end of the support, the impeller is arranged at the far end of the rotating shaft, the rotating shaft and the impeller are contained in the shell, and the rotating shaft rotates to drive the impeller to rotate.

2. A support device for a blood pump as claimed in claim 1, wherein the pitch of the distal portion of the stent is less than the pitch of the proximal portion of the stent.

3. The support device for a blood pump of claim 1, wherein when said stent is constrained from radial expansion by a sheath, a projection of said housing onto a reference plane in the direction of said base line is a first projection, and a projection of said stent onto said reference plane in the direction of said base line is a second projection, said first projection being within said second projection.

4. A support device for a blood pump as claimed in claim 1, wherein the cross-sectional area of the stent decreases sequentially from the distal end to the proximal end upon radial expansion of the stent.

5. The support device for a blood pump of claim 1, comprising a flexible drive shaft parallel to the base line, the flexible drive shaft being fixedly connected to the blood pump.

6. The support device for a blood pump of claim 1, wherein the distal end of the spiral is fixed to the formed spiral structure or the distal end of the spiral is provided with a flexible structure-an elastic member.

7. A support device for a blood pump as claimed in claim 1, wherein the proximal end of the helical wire is integrally formed with the housing.

8. A support device for a blood pump as claimed in claim 1, wherein the housing is provided with a fenestration through the side wall; the impeller is located at a fenestration of the housing.

9. An assisted blood circulation system, comprising:

a support device for a blood pump as claimed in any one of claims 1 to 8;

a delivery device for detachably connecting with the supporting device for the blood pump and for carrying the supporting device for the blood pump to intervene in a blood vessel.

10. The auxiliary blood circulation system according to claim 9, wherein the delivery device comprises a sheath for receiving the support means for the blood pump and limiting radial expansion of the stent.

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