CN219110631U

CN219110631U - Protective cover for ventricular assist device and catheter pump

Info

Publication number: CN219110631U
Application number: CN202223360317.5U
Authority: CN
Inventors: 黄霖; 郭扬
Original assignee: Shanghai Xinhengrui Medical Technology Co ltd
Current assignee: Shanghai Xinhengrui Medical Technology Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-06-02
Anticipated expiration: 2032-12-13

Abstract

The utility model provides a ventricular assist device and a protective cover for a catheter pump. The ventricular assist device comprises a catheter pump, a sensor and a protective cover, wherein a sensor sensitive element of the sensor is arranged outside the catheter pump and is positioned around a blood outflow port of the catheter pump, the protective cover comprises a supporting part and a shielding part, one side of the supporting part is connected with the shielding part, the shielding part extends along a direction away from the supporting part, and the shielding part is not contacted with the outer surface of the catheter pump only by fixing the supporting part on the outer surface of the catheter pump, and extends along a direction towards the sensor and covers the sensor sensitive element. By the arrangement, the risk of damage to the sensor can be reduced through the protective cover in the process of inserting the catheter pump into a human body, and the protective cover is simple in structure, can reduce the influence on the diameter of the catheter pump, is convenient to process and manufacture, and is more convenient to install.

Description

Protective cover for ventricular assist device and catheter pump

Technical Field

The utility model relates to the field of medical equipment, in particular to a protective cover for a ventricular assist device and a catheter pump.

Background

Implantable Ventricular Assist Devices (VADs) can significantly improve survival and quality of life in end-stage heart failure patients as a transitional support or permanent replacement therapy prior to heart transplantation. The catheter pump, which is one of ventricular assist devices, has a function of assisting in transporting oxygenated blood in the left ventricle into the aorta to complete blood circulation. The catheter pump enters the left ventricle through percutaneous intervention and retrograde through femoral artery, the front end of the catheter pump is provided with a cage-shaped blood inflow port, the catheter pump is provided with a blood outflow port at the ascending aortic section, a built-in miniature axial flow pump is arranged between the blood inflow port and the blood outflow port, the miniature axial flow pump is connected with an external controller through an internal lead, so that oxygenated blood is pumped from the left ventricle, and the oxygenated blood is directly pumped into the ascending aorta through the miniature axial flow pump, thereby establishing a left ventricle-ascending aortic drainage way.

For monitoring the blood outflow pressure, a sensor is usually provided in the vicinity of the blood outflow opening, which sensor is mostly adhered to the pump housing surface of the catheter pump by means of glue. However, during insertion of the catheter pump into the left ventricle, the tortuous insertion path may inevitably scratch the sensor, causing physical damage. In addition, most of sensors for monitoring pressure are thin film sensors, and in the measuring process, the pressure directly acts on the sensor sensing element to enable the sensor sensing element to generate displacement, and blood outflow pressure is obtained according to the displacement of the sensor sensing element. Likewise, during insertion of the catheter pump into the left ventricle, the sensor-sensitive element is also susceptible to erosion and scoring by shear forces, affecting the performance of the sensor.

For this reason, a protective structure is typically provided for the sensor on the pump housing to reduce the risk of the sensor being damaged during insertion of the catheter pump into the human body. However, the present protection structure is too complex, and the protection structure is composed of a plurality of structural members (the structural members with shielding function and the structural members with supporting function in the protection structure are separated independently and cannot be integrally formed). In addition, the guard structure is excessively complicated, and when the guard structure is attached to the outer surface of the pump housing, the diameter of the catheter pump becomes large, and the process is also more complicated, increasing the manufacturing cost. Therefore, to minimize the diameter of the catheter pump, the guard should be as small as possible. In addition, improper restriction and protection of the sensor can also easily cause stagnation after blood flows out of the catheter pump, increasing thrombus risk.

Disclosure of Invention

The utility model relates to a protective cover for a ventricular assist device and a catheter pump, which can reduce the risk of damage to a sensor during the insertion of the catheter pump into a human body and simplify the protective structure.

In order to achieve the above object, the present utility model provides a protective cover for a catheter pump, the protective cover comprising a support portion and a shielding portion, one side of the support portion being connected to the shielding portion, the shielding portion extending in a direction away from the support portion; the support portion is configured at least in part for attachment to an outer surface of the catheter pump and such that the shield portion is not in contact with the outer surface of the catheter pump and such that the shield portion extends in a direction toward a sensor on the catheter pump and covers a sensor sensing element.

Optionally, the support portion is configured to be fixed to an outer surface of the catheter pump at both ends in a circumferential direction thereof.

Optionally, the support portion is provided with a notch at the other side facing away from the shielding portion.

Optionally, the support is configured to be welded and/or glued to the outer surface of the catheter pump.

Optionally, the width of the shielding part along the circumferential direction of the catheter pump is smaller than the width of the supporting part along the circumferential direction of the catheter pump.

Optionally, the protection cover is of an integrally-formed structure, and/or the protection cover is of an axisymmetric structure.

In order to achieve the above object, the present utility model also provides a ventricular assist device comprising a catheter pump, a sensor, and a shield for use with any of the catheter pumps; the sensor sensitive element of the sensor is arranged outside the catheter pump and is positioned around the blood outflow port of the catheter pump; the support part is fixed on the outer surface of the catheter pump at the distal end side of the blood outflow port; the shield is not in contact with the outer surface of the catheter pump and extends in a direction toward the sensor and covers the sensor sensing element.

Optionally, the blood outflow port is disposed on a pump casing of the catheter pump, and a blood hole is further disposed on the pump casing, and the blood hole is disposed around the blood outflow port and covered by the shielding portion.

Optionally, an end of the shielding portion away from the supporting portion is erected on the sensor.

Optionally, a first limit groove is formed in the outer surface of the pump shell of the catheter pump, the sensor head of the sensor is embedded in the first limit groove, and/or a second limit groove is formed in the outer surface of the motor shell of the catheter pump, and the sensor transmission line of the sensor is embedded in the second limit groove.

The utility model provides a protective cover for a catheter pump, which comprises: the shielding part is connected with one side of the supporting part and extends along a direction away from the supporting part; the support portion is configured at least in part for attachment to an outer surface of the catheter pump and such that the shield portion is not in contact with the outer surface of the catheter pump and such that the shield portion extends in a direction toward a sensor on the catheter pump and covers a sensor sensing element.

By the arrangement, in the process of inserting the catheter pump into a human body, the sensor sensitive element on the catheter pump can be protected through the protective cover, so that the sensor sensitive element is prevented from being scratched, damaged by shearing force and the like, and the risk of damage to the sensor is reduced. Besides, the structure of the protective cover is simplified, the influence on the diameter of the catheter pump can be reduced, the processing and the manufacturing are convenient, and the installation is more convenient.

Because the ventricular assist device provided by the utility model and the protective cover provided by the utility model belong to the same utility model conception, the ventricular assist device provided by the utility model has all the advantages of the protective cover provided by the utility model, and the beneficial effects of the ventricular assist device provided by the utility model are not repeated here. Further, the pump shell is provided with the blood hole, so that blood flowing out of the blood hole can wash the blood outside the catheter pump, the risk of blood stagnation is reduced, the risk of thrombosis is further reduced, and the performance of the sensor can be ensured.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present utility model and do not constitute any limitation on the scope of the present utility model. Wherein:

fig. 1 is a schematic diagram of an overall structure of a ventricular assist device according to an embodiment of the present utility model;

FIG. 2 is a side view of a ventricular assist device according to an embodiment of the present utility model with sensors mounted around a blood outflow port;

FIG. 3 is an enlarged schematic view of a ventricular assist device according to an embodiment of the present utility model, in which a sensor is installed around a blood outlet;

fig. 4 is a schematic structural diagram of a protective cover according to an embodiment of the present utility model.

In the accompanying drawings:

100-catheter pump; 102-pigtail; 104-blood inflow cage; 106-suction tube; 108-a pump shell; 1081-blood outflow port; 1082-struts; 1083-a first limit groove; 1084-blood well; 110-motor housing; 1101-second limiting groove; 112-a proximal catheter; 200-a sensor; 202-a sensor sensing element; 204-a sensor head; 206-sensor transmission lines; 300-protecting cover; 3021-a support; 3022-shielding; 3023-one end of the support; 3024-opening.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As used herein, "distal" refers to the end of the catheter pump that is proximal to the heart after insertion into the human body; the "proximal end" is the end opposite the "distal end". As used herein, "circumferential" refers to a direction about the central axis of the catheter pump, and "axial" refers to a direction along the central axis of the catheter pump; "radial" refers to a direction along the diameter of the catheter pump.

The heart of the utility model is to provide a protective cover for a ventricular assist device and a catheter pump, so as to solve the problem that the structure is too complex when a sensor is protected in the prior art, and further solve the problem that thrombus is easy to cause when the sensor is limited or protected in the prior art.

The following description refers to the accompanying drawings, and the following embodiments and features of the embodiments may be mutually complementary or combined without conflict.

As shown in fig. 1-4, embodiments of the present application provide a ventricular assist device that includes, but is not limited to, delivering oxygenated blood in the left ventricle into the aorta. The ventricular assist device specifically includes a catheter pump 100, a sensor 200, and a shield 300.

The sensor 200 is typically a thin film sensor and includes a sensor sensing element 202, the sensor sensing element 202 being configured to displace (e.g., deflect) in response to a change in pressure applied to the sensor sensing element 202, the sensor sensing element 202 being disposed at a distal end face of the sensor 200. The sensor 200 ultimately obtains the pressure of blood flowing out of the catheter pump 100 based on the displacement produced by the sensor sensing element 202. Sensor sensing element 202 is disposed outside catheter pump 100 and around blood outflow port 1081 of catheter pump 100. Sensor sensing element 202 primarily monitors blood outflow pressure at blood outflow port 1081.

The protective cover 300 is applied to the catheter pump 100, and is used for protecting the sensor 200, particularly protecting the sensor sensing element 202, avoiding the sensor sensing element 202 from being damaged during the process of inserting the catheter pump 100 into a human body, and ensuring that the sensor 200 can work normally.

As shown in fig. 1, catheter pump 100 may include a pigtail 102, a blood inflow cage 104, a suction tube 106, a pump housing 108, a motor housing 110, and a proximal catheter 112, which are disposed in order from distal to proximal along its own axis. It is to be understood that the configuration of catheter pump 100 herein is merely illustrative and not limiting of the configuration of catheter pump 100 of the present application.

Catheter pump 100 also includes a motor disposed within motor housing 110 and an impeller disposed within pump housing 108. The motor is used as a power source for the rotation of the impeller to drive the impeller to rotate.

The main function of the pigtail 102 is to position the catheter pump 100 such that the curl or bend of the distal-most end of the pigtail 102 can be placed against the ventricle wall to prevent the catheter pump 100 from sloshing.

The blood inflow cage 104 serves as a blood inflow port of the catheter pump 100.

The pump housing 108 is provided with a blood outlet 1081, and the blood pressurized by the impeller can flow out of the catheter pump 100 through the blood outlet 1081. Blood outflow ports 1081 are generally uniformly disposed circumferentially about catheter pump 100, struts 1082 are disposed between blood outflow ports 1081, blood outflow ports 1081 are separated by struts 1082, and sensor 200 may be mounted to one of struts 1082 to monitor blood outflow pressure in the vicinity of blood outflow ports 1081.

The proximal catheter 112 is typically 9F in size, and may incorporate wires such as sensor wires 206, motor wires, and other wires, and may incorporate irrigation tubing and other fittings. Further, a nitinol reinforcement wire is integrated within the proximal catheter 112, and is used to increase the stiffness of the proximal catheter 112 to enhance the pushing performance of the proximal catheter 112.

In practical use, after the ventricular assist device is placed in the body, blood at a target location enters the catheter pump 100 from the blood inflow cage 104, flows through the suction tube 106, performs work through the pressurization of the impeller, and finally flows out of the blood outflow port 1081 of the pump housing 108.

As shown in fig. 2 and 3, sensor head 204 of sensor 200 is secured to post 1082 of pump housing 108, and sensor sensing element 202 is disposed on sensor head 204. Since the present application is not directed to improvements to sensor 200, one skilled in the art can appreciate the structure of sensor 200 and its manner of operation with reference to the prior art. It will be appreciated that sensor head 204 is an electrical component that converts the displacement of sensor sensitive element 202 into an optical or electrical signal output.

There is no particular requirement in the present application for the particular type of sensor 200, which may be an electrical sensor or an optical sensor. Optical sensors typically employ fiber optic sensors. In this embodiment, an optical fiber sensor is schematically described.

As shown in fig. 3, sensor 200 includes a sensor sensing element 202, a sensor head 204, and a sensor transmission line 206 connected in sequence. The sensor sensing element 202 is disposed at an end (e.g., distal end) of the sensor head 204 facing away from the sensor transmission line 206. The end of the sensor head 204 facing away from the sensor sensitive element 202 is connected to a sensor transmission line 206. A portion of the sensor transmission line 206 is disposed outside of the catheter pump 100, and another portion extends into the interior of the catheter pump 100 and extends proximally of the catheter pump 100, connectable to an extracorporeal pressure monitoring device. Specifically, a portion of the sensor transmission line 206 extends axially of the catheter pump 100 on the outer surface of the motor housing 110 and the outer surface of the pump housing 108 after passing through the proximal catheter 112 and another portion of the sensor transmission line extends out of the motor housing 110. Sensor transmission line 206 is used to transmit a signal (e.g., an electrical or optical signal) corresponding to the displacement of sensor sensing element 202, and ultimately to obtain the pressure of blood exiting blood outflow port 1081 based on the signal corresponding to the displacement of sensor sensing element 202.

With continued reference to FIG. 3, a first limit groove 1083 is provided on the outer surface of the pump housing 108, and the sensor head 204 is embedded in the first limit groove 1083, thereby limiting the sensor head 204. The first limit groove 1083 is specifically disposed on one of the posts 1082. Alternatively, the first limit groove 1083 is eliminated and the sensor head 204 is adhesively secured to the post 1082 with glue.

As shown in fig. 3, a second limiting groove 1101 is formed on the outer surface of the motor casing 110, and the sensor transmission line 206 is embedded in the second limiting groove 1101, so as to achieve the purpose of limiting the sensor transmission line 206. Alternatively, the second limiting recess 1101 is eliminated, and the portion of the sensor transmission line 206 exposed to the outside of the catheter pump 100 is adhesively secured, again with glue.

In view of the fact that the outer diameter of the sensor head 204 is greater than the outer diameter of the sensor transmission line 206, the groove width of the first limit groove 1083 is correspondingly greater than the groove width of the second limit groove 1101, and the groove depth of the first limit groove 1083 should also be greater than the groove depth of the second limit groove 1101. The groove width refers to a width along the circumferential direction of the catheter pump 100.

As shown in fig. 2 to 4, the protective cover 300 provided in this embodiment may be a sheet-shaped protective cover. The shield 300 is a unitary or one-piece structure, as opposed to prior art shield structures that are comprised of a plurality of structural members. Therefore, the shield 300 has a simple structure, occupies a small volume when being mounted on the outer surface of the pump housing 108, reduces the influence on the diameter of the catheter pump 100, is beneficial to the interventional therapy of the catheter pump 100 in the human body, and is convenient to process and manufacture and easy to install. In particular, catheter pump 100 is implanted in a human body, the size of catheter pump 100 is limited to a small extent, and therefore, the more structural members of shield 300, the more difficult it is to manufacture.

Specifically, as shown in fig. 3 and 4, the shield 300 includes a support portion 3021 and a shielding portion 3022. One side of the support portion 3021 is connected to the shielding portion 3022, and the shielding portion 3022 extends in a direction away from the support portion 3021. The main function of the support portion 3021 is to support the stationary shield 300 and to raise the shield portion 3022 above the outer surface of the pump housing 108 so that the shield portion 3022 is not in contact with the outer surface of the catheter pump 100. The shield 3022 does not prevent blood from flowing out of the catheter pump 100 when it is not in contact with the outer surface of the pump housing 108.

The assembly of the protective cover 300 is as follows: at the distal end side of sensor head 204, that is, the distal end side of blood outflow port 1081, at least part of the structure of support 3021 is fixed to the outer surface of pump housing 108, and shield 3022 is made to be out of contact with the outer surface of pump housing 108, and shield 3022 is made to extend in the direction toward sensor 200 and cover sensor sensing element 202. So set up, in the catheterization pump 100 inserts human in-process, accessible protection casing 300 protects the sensor sensing element 202 on the catheterization pump 100, avoids sensor sensing element 202 to receive injuries such as scratch and shear force to reduce the risk of sensor 200 damage.

Further, the shield 3022 extends above the sensor head 204 to further cover a portion of the sensor head 204. Further, the end of the shielding portion 3022 away from the supporting portion 3021 is erected on the sensor 200, such as on the sensor head 204, that is, the end of the shielding portion 3022 away from the supporting portion 3021 is overlapped on the sensor 200 or the sensor head 204, so as to improve the support of the protection cover 300.

The support 3021 may be partially fixed to the outer surface of the pump casing 108, or may be entirely fixed to the outer surface of the pump casing 108.

As shown in fig. 4, the supporting portion 3021 may be disposed in an arc shape, so that the outer surface of the protecting cover 300 is a smooth arc surface to reduce the damage to the blood vessel wall during the insertion process, and the supporting portion 3021 is in an arc shape, so as to reduce the risk of thrombus formation due to the groove or the slit on the outer surface of the protecting cover 300. Further, both ends 3023 of the support portion 3021 in the circumferential direction thereof are fixed to the outer surface of the pump housing 108, such as by welding or glue bonding to the outer surface of the pump housing 108. The two ends 3023 of the support 3021, like the two sheet-like support feet, may be attached to the outer surface of the pump housing 108, and in so doing, may be smaller in radial dimension. It will be appreciated that the circumference of the support 3021 corresponds to the circumference of the catheter pump 100.

When both ends 3023 of the support portion 3021 are fixed to the outer surface of the pump housing 108, a gap may be formed between the arc-shaped portion between the both ends 3023 and the outer surface of the pump housing 108 such that the arc-shaped portion arches in a direction away from the pump housing 108. Further, the support portion 3021 is provided with a notch 3024 at the other side facing away from the shielding portion 3022, and the notch 3024 may be filled with glue, and the support portion 3021 is further fixed by glue. The shape of the notch 3024 is not limited. In other embodiments, the gap 3024 may not be filled with glue.

In practice, the support 3021 is welded to the outer surface of the pump housing 108 alone, or glued to the outer surface of the pump housing 108 simultaneously with welding. The welding between the support 3021 and the pump housing 108, and the filling of glue at the opening 3024 all help to secure the shield 300 stably on the outer surface of the pump housing 108.

The width of the shielding portion 3022 along the circumferential direction of the catheter pump 100 is preferably smaller than the width of the supporting portion 3021 along the circumferential direction of the catheter pump 100, so that the shield 300 has a substantially T-shaped structure, and in this case, the shield 300 has a smaller size and a lighter weight.

The shield 300 is made of a biocompatible material, and the specific material is not limited. The protective cover 300 is preferably a stainless steel sheet, and has the advantages of good strength, easy processing and low cost. The protective cover 300 can be integrally formed, or can be formed by splicing structures which are independently formed. The support portion 3021 may be formed by splicing itself, or the support portion 3021 and the shielding portion 3022 may be formed by splicing together. In this embodiment, the protection cover 300 is an integrally formed structure, so that additional assembly operations can be omitted, thereby simplifying the installation process. The shield 300 may be axially symmetrical or non-axially symmetrical, preferably axially symmetrical, for ease of manufacture.

Whereas blood exiting blood outflow port 1081 is likely to stagnate due to blockage of grooves, slits, or structures, thereby increasing the risk of thrombosis. To further solve this problem, as shown in fig. 3, the present application provides a blood hole 1084 in the pump housing 108, and the blood hole 1084 is provided around the blood outflow port 1081 and covered with the shield 3022. The blood hole 1084 may release blood within the catheter pump 100 to promote blood flow outside the catheter pump 100, preventing stagnation of blood flowing out of the blood outflow port 1081 from creating a thrombus. The blood flowing out of the blood hole 1084 can wash the sensor sensing element 202, prevent the blood from accumulating or coagulating on the surface of the sensor sensing element 202, avoid affecting the use of the sensor 200, and wash other parts easy to retain blood, such as the corners, gaps and limit grooves of the protective cover 300, avoid blood stagnation, and reduce the risk of thrombus formation. The shield 3022 may cover a portion of the blood port 1084 or may cover the blood port 1084 entirely. In this embodiment, the width of the shielding portion 3022 in the circumferential direction is larger than the diameter of the blood hole 1084 so as to completely shield the blood hole 1084. Preferably, the blood aperture 1084 is disposed adjacent the sensor sensing element 202.

In conclusion, after the protective cover provided by the utility model is adopted, the damage risk of the sensor is reduced, the structure of the protective cover is simplified, the influence on the diameter of the catheter pump is reduced, the processing and the manufacturing are convenient, and the installation is more convenient. Further, the pump shell is provided with the blood hole, so that blood flowing out of the blood hole can wash out blood outside the catheter pump, the risk of blood stagnation is reduced, the risk of thrombosis is further reduced, and meanwhile, the sensor sensitive element can be washed out, so that the performance of the sensor is ensured.

It should be noted that, in the present description, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, the description is relatively simple because of corresponding to the method disclosed in the embodiment, and the relevant points refer to the description of the method section.

It should be further noted that although the present utility model has been disclosed in the preferred embodiments, the above embodiments are not intended to limit the present utility model. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

It should be further understood that the terms "first," "second," and the like in this specification are used solely to distinguish one from another component, element, step, or the like in the specification and do not necessarily denote a logical or sequential relationship between the individual components, elements, steps, or the like, unless otherwise indicated.

It should also be understood that the terminology described herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present utility model. It must be noted that, as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, reference to "a step" or "an apparatus" means a reference to one or more steps or apparatuses, and may include sub-steps as well as sub-apparatuses. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood as having the definition of a logical "or" rather than a logical "exclusive or" unless the context clearly indicates the contrary. Furthermore, implementation of the methods and/or apparatus in embodiments of the utility model may include performing selected tasks manually, automatically, or in combination.

Claims

1. A protective cover for a catheter pump, which is characterized by comprising a supporting part and a shielding part, wherein one side of the supporting part is connected with the shielding part, and the shielding part extends along a direction away from the supporting part; the support portion is configured at least in part for attachment to an outer surface of the catheter pump and such that the shield portion is not in contact with the outer surface of the catheter pump and such that the shield portion extends in a direction toward a sensor on the catheter pump and covers a sensor sensing element.

2. A shield for use with a catheter pump as claimed in claim 1, wherein the support is configured at both ends in its own circumferential direction for securing to an outer surface of the catheter pump.

3. A shield for use with a catheter pump according to claim 1 or 2, wherein the support portion is provided with a gap on the other side facing away from the shield portion.

4. A shield for use with a catheter pump according to claim 1 or 2, wherein the support portion is configured to be welded and/or glued to the outer surface of the catheter pump.

5. A shield for use with a catheter pump according to claim 1 or claim 2, wherein the width of the shield portion in the circumferential direction of the catheter pump is less than the width of the support portion in the circumferential direction of the catheter pump.

6. A shield for use with a catheter pump according to claim 1 or 2, wherein the shield is of unitary machined construction and/or the shield is of axisymmetrical construction.

7. A ventricular assist device comprising a catheter pump, a sensor, and a shield for use with the catheter pump of any one of claims 1-6; the sensor sensitive element of the sensor is arranged outside the catheter pump and is positioned around the blood outflow port of the catheter pump; the support part is fixed on the outer surface of the catheter pump at the distal end side of the blood outflow port; the shield is not in contact with the outer surface of the catheter pump and extends in a direction toward the sensor and covers the sensor sensing element.

8. The ventricular assist device of claim 7, wherein the blood outflow port is provided on a pump housing of the catheter pump, and a blood hole is further provided on the pump housing, the blood hole being provided around the blood outflow port and covered by the shielding portion.

9. A ventricular assist device according to claim 7 or 8, wherein an end of the shielding portion remote from the support portion is mounted on the sensor.

10. The ventricular assist device of claim 7 or 8, wherein a first limit groove is provided on an outer surface of a pump housing of the catheter pump, a sensor head of the sensor is embedded in the first limit groove, and/or a second limit groove is provided on an outer surface of a motor housing of the catheter pump, and a sensor transmission line of the sensor is embedded in the second limit groove.