Ventricular assist device

Abstract

The invention provides a ventricular assist device. The ventricular assist device comprises a pump body and a sensing assembly. The pump body comprises a pump shell and an inlet pipe, and the pump shell is provided with a containing cavity. The inlet pipe is connected with the pump shell and provided with a liquid inlet channel communicated with the containing cavity. The inlet pipe comprises an inner pipe defining a liquid inlet and outlet channel and an outer pipe surrounding the inner pipe, and a pressure measuring hole communicated with the liquid inlet channel is formed in the side wall of the inner pipe; the sensing assembly comprises a sensor, the sensor is arranged between the inner tube and the outer tube, the sensor comprises a sensing part, and the sensing part and the pressure measuring hole are correspondingly arranged, so that the sensor can sense the blood pressure in the liquid inlet channel. According to the ventricular auxiliary device, the sensing part of the sensor corresponds to the pressure measuring hole in the inner tube, so that the sensor can sense the blood pressure in the liquid inlet channel, and the blood flow can be adjusted according to the blood pressure subsequently. The sensor is arranged between the inner tube and the outer tube, so that the sensor can be prevented from influencing implantation of the ventricular auxiliary device.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a ventricular assist device. Background Art

[0002] A ventricular assist device is a device used to assist patients with severe ventricular insufficiency or heart failure to provide a certain amount of blood flow and blood pressure. During the operation of a ventricular assist device, it is usually necessary to measure the current pumping blood pressure through a sensor to determine whether the ventricular assist device provides an appropriate amount of blood flow.

[0003] However, the installation of traditional ventricular assist device sensors will affect the implantation of the ventricular assist device and needs to be improved. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide a ventricular assist device that can conveniently measure the pressure of pumped blood. The embodiment of the present application achieves the above purpose through the following technical solutions.

[0005] The present application provides a ventricular assist device, comprising a pump body and a sensor assembly, wherein the pump body comprises a pump casing and an inlet tube, wherein the pump casing is provided with a receiving chamber; the inlet tube is connected to the pump casing and has a liquid inlet channel connected with the receiving chamber; the inlet tube comprises an inner tube defining the liquid inlet channel and an outer tube surrounding the inner tube, wherein the side wall of the inner tube is provided with a pressure measuring hole connected with the liquid inlet channel; the sensor assembly comprises a sensor, wherein the sensor is arranged between the inner tube and the outer tube, wherein the sensor comprises a sensing part, wherein the sensing part is arranged corresponding to the pressure measuring hole, so that the sensor can sense the blood pressure in the liquid inlet channel.

[0006] In one embodiment, the sensor assembly further includes a diaphragm, which is disposed on a side of the sensing portion adjacent to the liquid inlet channel; an installation groove is provided on the inner wall surface of the inner tube, the pressure measuring hole passes through the bottom of the installation groove, and the diaphragm is installed in the installation groove.

[0007] In one embodiment, the liquid inlet channel includes a liquid inlet section and a liquid flow section that are connected to each other. The liquid inlet section is away from the receiving chamber relative to the liquid flow section, and the inner diameter of the liquid inlet section gradually decreases along the direction from the liquid inlet section to the liquid flow section, and the inner diameter of the liquid flow section remains unchanged, and the pressure measuring hole is arranged in the liquid flow section.

[0008] In one embodiment, the liquid inlet channel also includes a liquid outlet section, which is arranged on the side of the liquid flow section away from the liquid inlet section, the liquid outlet section is connected to the receiving cavity, and the pressure measuring hole is arranged on the side of the liquid flow section away from the liquid outlet section.

[0009] In one embodiment, the ventricular assist device also includes an impeller, a drive motor and a controller, wherein the impeller is rotatably disposed in the receiving chamber; the drive motor is connected to the pump housing, and the drive motor can drive the impeller to rotate; the controller is electrically connected to the drive motor and the sensor to control the drive motor to adjust the speed of the impeller according to the blood pressure.

[0010] In one embodiment, the sensing assembly also includes a cable connecting the sensor and the controller; the driving motor includes a driving shell connected to the pump shell, the driving shell is provided with a driving cavity separated from the accommodating cavity, and a first wire hole connected to the driving cavity, the controller is arranged in the driving cavity; the cable is passed through the first wire hole.

[0011] In one embodiment, the sensing assembly also includes a cable connecting the sensor and the controller; the pump housing is provided with a liquid inlet connecting the receiving chamber and the liquid inlet channel; the pump housing has a pump top surface facing the inlet pipe, and the pump top surface is provided with an outer convex ring surrounding the periphery of the liquid inlet, the outer convex ring is connected to the outer tube, and the outer convex ring is provided with a second wire hole for the cable to pass through.

[0012] In one embodiment, the pump housing also has a pump side surface connected to the pump top surface; the pump top surface is provided with a wire accommodating groove, one end of the wire accommodating groove is adjacent to the second wire hole, and the other end of the wire accommodating groove extends radially to close to the pump side surface, and at least part of the cable is accommodated in the wire accommodating groove; and / or, the outer peripheral surface of the outer convex ring is provided with an expansion groove, and the expansion groove surrounds the outer periphery of the second wire hole.

[0013] In one embodiment, the inner tube of the inlet pipe includes a tube body and a mounting member; wherein, an assembly opening is opened on the side wall of the tube body; the mounting member is in the shape of a cover plate and is covered on the assembly opening to enclose the liquid inlet channel together with the tube body; the pressure measuring hole is arranged on the mounting member.

[0014] In one embodiment, the mounting member has an inner plate surface facing the liquid inlet channel, and the inner plate surface smoothly transitions with the inner wall surface of the tube body; and / or,

[0015] The mounting member has an outer plate surface facing away from the liquid inlet channel, and the outer plate surface smoothly transitions with the outer wall surface of the tube body.

[0016] In one embodiment, an inner plate surface of the mounting member facing the liquid inlet channel is provided with a mounting groove, and the sensor assembly further includes a diaphragm provided between the sensing portion and the liquid inlet channel, and the diaphragm is installed in the mounting groove.

[0017] In one embodiment, the ventricular assist device further comprises at least one of the following features:

[0018] The pressure measuring hole passes through the bottom surface of the installation groove, and the diaphragm covers the pressure measuring hole;

[0019] The diaphragm has a smooth transition with the inner wall surface of the tube body;

[0020] The material of the diaphragm is titanium or silicon dioxide.

[0021] In one embodiment, the pump housing is provided with a liquid inlet connecting the accommodating chamber and the liquid inlet channel; the pump housing has a pump top surface facing the inlet pipe, and the pump top surface is provided with an inner convex ring surrounding the periphery of the liquid inlet; the inner tube includes a tube body and a mounting member arranged along the axial direction, the mounting member is cylindrical and connected between the tube body and the inner convex ring, and the pressure measuring hole is arranged on the mounting member.

[0022] In one embodiment, the inner circumferential surface of the mounting member is farther away from the central axis of the inlet pipe relative to the inner wall surface of the tube body and the inner wall surface of the inner convex ring, so that the inner circumferential surface of the mounting member is radially recessed outward relative to the inner wall surface of the tube body or the inner wall surface of the inner convex ring to form a mounting groove; the sensor assembly also includes a diaphragm, which is installed in the mounting groove, and the diaphragm has a smooth transition with the inner wall surface of the tube body.

[0023] In one embodiment, a mounting boss is convexly provided on the outer wall surface of the inner tube, the pressure measuring hole passes through the mounting boss, a mounting plane is provided on the side of the mounting boss facing away from the liquid inlet channel, the sensor also includes a substrate, the sensing part is mounted on the substrate, and the substrate is attached to the mounting plane.

[0024] In one embodiment, the outer wall surface of the inner tube includes a cutting plane and a circumferential surface connected to the cutting plane and extending in the circumferential direction; the mounting boss is arranged on the circumferential surface; and the mounting plane of the mounting boss is coplanar with the cutting plane.

[0025] Compared with the prior art, the ventricular assist device provided by the present application has a corresponding arrangement of the sensing part of the sensor and the pressure measuring hole on the inner tube, so that the blood in the liquid inlet channel can contact the sensing part of the sensor through the pressure measuring hole, so that the sensor can sense the blood pressure in the liquid inlet channel, which is convenient for adjusting the blood flow according to the blood pressure, thereby facilitating the ventricular assist device to provide appropriate blood flow to meet the patient's blood flow needs at different times. By arranging the sensor between the inner tube and the outer tube, the sensor can be prevented from being exposed to the outside of the inlet tube, thereby avoiding affecting the implantation of the ventricular assist device; in addition, the sensor is arranged between the inner tube and the outer tube, which can also reduce the impact of external factors on the sensor and extend the service life of the sensor.

[0026] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the ventricular assist device provided in the first embodiment of the present application.

[0029] Figure 2 yes Figure 1 A top view of a ventricular assist device is shown.

[0030] Figure 3 yes Figure 2 A cross-sectional view of the ventricular assist device along direction AA is shown.

[0031] Figure 4 yes Figure 1 An exploded view of the sensing assembly and pump housing (excluding the secondary housing) of a ventricular assist device is shown.

[0032] Figure 5 yes Figure 4 The sensor assembly and pump housing (excluding the second housing) are shown as an exploded view from another perspective.

[0033] Figure 6 yes Figure 4 A schematic structural diagram of the sensor assembly and pump housing (excluding the outer tube and the second housing) is shown.

[0034] Figure 7 yes Figure 4 A front view of the assembly of the sensing assembly and pump housing (excluding the secondary housing) of a ventricular assist device is shown.

[0035] Figure 8 yes Figure 7 The sensor assembly and pump casing assembly shown is a cross-sectional view along direction BB.

[0036] Fig. 9 yes Figure 8 The cross-sectional view of the sensor assembly and pump housing shown is a partial enlargement of the position P1.

[0037] Fig.10 yes Figure 8 The cross-sectional view of the sensor assembly and pump housing (after removing the diaphragm) is shown as an enlarged view of the part at P1.

[0038] Fig.11 yes Figure 7 The sensor assembly and the pump housing (excluding the second housing) are shown as an assembly view from another perspective.

[0039] Fig.12 yes Figure 1 An assembly diagram of a mounting and diaphragm for a ventricular assist device is shown.

[0040] Fig.13 yes Fig.12 Exploded view of mounting and diaphragm shown.

[0041] Fig.14 yes Figure 7 The pump casing is shown in cross-sectional view along CC direction.

[0042] Fig.15 It is a longitudinal cross-sectional view of the ventricular assist device provided in the second embodiment of the present application.

[0043] Fig.16 yes Fig.15 An exploded view of the sensing assembly and pump housing (excluding the secondary housing) of a ventricular assist device is shown.

[0044] Fig.17 yes Fig.16 The sensor assembly and pump housing (excluding the second housing) are shown as an exploded view from another perspective.

[0045] Fig.18 yes Fig.15 A front view of the assembly of the sensing assembly and pump housing (excluding the secondary housing) of a ventricular assist device is shown.

[0046] Fig.19 yes Fig.18 The sensor assembly and pump casing assembly shown is a cross-sectional view along the DD direction.

[0047] The above drawings include the following reference numerals:

[0048] 1. ventricular assist device; 10. pump body; 100. pump housing; 101. pump top surface; 102. pump side surface; 110. receiving chamber; 130. inlet pipe; 132. liquid inlet channel; 1321. liquid inlet section; 1323. liquid flow section; 1325. liquid outlet section; 134. inner tube; 1342. mounting boss; 1343. outer wall surface of inner tube; 1344. mounting plane; 1345. cutting plane; 1346. circumferential surface; 136. outer tube; 1361. inner wall surface of outer tube; 137. tube body; 1372. first annular step; 1373. inner wall surface of tube body; 139. mounting member; 1391. inner circumferential surface of mounting member; 1392. second annular step; 1393. outer circumferential surface of mounting member; 13 96, mounting groove; 1397, groove bottom surface; 1398, pressure measuring hole; 140, receiving shell; 142, first shell; 1421, first wire-containing groove; 144, second shell; 150, outer convex ring; 151, second wire hole; 153, second wire-containing groove; 155, outer peripheral surface of outer convex ring; 160, inner convex ring; 161, inner wall surface of inner convex ring; 170, outlet pipe; 180, containing cavity; 120, liquid inlet; 190, impeller; 11, driving motor; 112, driving shell; 1121, driving cavity; 1122, first wire hole; 12, sensor assembly; 121, diaphragm; 124, sensor; 1241, sensing part; 126, cable; 128, substrate; 14, controller; 15, magnetic ring DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0050] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0055] The inventor of the present application found that patients require different blood flow at different times. For example, in the early stage of implantation of a ventricular assist device, the ventricular assist device needs to provide a larger blood flow; and as the heart function gradually recovers, the required blood flow will decrease. In order to provide a suitable blood flow, it is necessary to detect the pumped blood pressure or blood flow. However, it is difficult to measure the blood pressure or blood flow of a traditional ventricular assist device, and the installation of a traditional ventricular assist device sensor will affect the implantation of the ventricular assist device.

[0056] In order to improve at least some of the above problems, the present application proposes a ventricular assist device, in which the sensing part of the sensor is arranged corresponding to the pressure measuring hole on the inner tube, so that the blood in the liquid inlet channel can contact the sensing part of the sensor through the pressure measuring hole, so that the sensor can sense the blood pressure in the liquid inlet channel, which is convenient for the subsequent adjustment of the blood flow according to the blood pressure, thereby facilitating the ventricular assist device to provide appropriate blood flow to meet the patient's blood flow needs at different times. By arranging the sensor between the inner tube and the outer tube, it is possible to avoid the sensor being exposed to the outside of the inlet tube, thereby avoiding affecting the implantation of the ventricular assist device; in addition, the sensor is arranged between the inner tube and the outer tube, which can also reduce the impact of external factors on the sensor and extend the service life of the sensor. The ventricular assist device provided by the present application is described in detail below in conjunction with the specific implementation methods and the drawings in the specification.

[0057] First embodiment

[0058] See also Figures 1 to 5 The present embodiment provides a ventricular assist device 1, comprising a pump body 10 and a sensor assembly 12, wherein the pump body 10 comprises a pump casing 100 and an inlet tube 130, wherein the pump casing 100 is provided with a receiving chamber 110; the inlet tube 130 comprises an inner tube 134 defining an inlet and outlet liquid channel 132 and an outer tube 136 surrounding the inner tube 134, wherein a side wall of the inner tube 134 is provided with a pressure measuring hole 1398 communicating with the inlet liquid channel 132; the sensor assembly 12 comprises a sensor 124, wherein the sensor 124 is arranged between the inner tube 134 and the outer tube 136, wherein the sensor 124 comprises a sensing portion 1241, wherein the sensing portion 1241 is arranged corresponding to the pressure measuring hole 1398, so that the sensor 124 can sense the blood pressure in the inlet liquid channel 132. Among them, the corresponding arrangement of the sensing part 1241 and the pressure measuring hole 1398 means that the entire sensing part 1241 is exposed in the pressure measuring hole 1398, and the sensing part 1241 will not be blocked by the side wall of the inner tube 134, so that the sensing part 1241 can accurately sense the blood pressure.

[0059] The ventricular assist device 1 provided by the present application is provided with a corresponding arrangement of the sensing portion 1241 of the sensor 124 and the pressure measuring hole 1398 on the inner tube 134, so that the blood in the liquid inlet channel 132 can contact the sensing portion 1241 of the sensor 124 through the pressure measuring hole 1398, so that the sensor 124 can sense the blood pressure in the liquid inlet channel 132, which is convenient for adjusting the blood flow according to the blood pressure, thereby facilitating the ventricular assist device 1 to provide a suitable blood flow to meet the patient's blood flow requirements at different times. By arranging the sensor 124 between the inner tube 134 and the outer tube 136, the sensor 124 can be prevented from being exposed to the outside of the inlet tube 130, thereby avoiding affecting the implantation of the ventricular assist device 1; in addition, the sensor 124 is arranged between the inner tube 134 and the outer tube 136, which can also reduce the influence of external factors (such as external force, water vapor, dust, etc.) on the sensor, thereby extending the service life of the sensor 124.

[0060] Specifically, the ventricular assist device 1 is an implantable blood pump, which is suitable for being installed on the outer wall of the heart. The inlet tube 130 of the ventricular assist device 1 can pass through the outer wall of the heart and extend into the heart, so that the tube mouth 131 of the inlet tube 130 is in the heart. The implantable blood pump has a large blood pumping flow rate and a longer service life.

[0061] See also Figure 3 The pump body 10 further includes an outlet pipe 170 connected to the receiving chamber 110, and an impeller 190 rotatably disposed in the receiving chamber 110. The outlet pipe 170 is used for the outflow of liquid. The outlet pipe 170 can be connected to an artificial blood vessel (not shown), and the artificial blood vessel is connected to the aorta or the pulmonary artery, so that the liquid can flow from the outlet pipe 170 to the aorta or the pulmonary artery through the artificial blood vessel. The receiving chamber 110 is roughly in the shape of a volute, and the impeller 190 can be suspended in the receiving chamber 110, and the rotation of the impeller 190 can transport the liquid entering the inlet pipe 130 to the outlet pipe 170. In this embodiment, the impeller 190 is a centrifugal impeller. Through the centrifugal action of the impeller 190, the blood close to the blades of the impeller 190 can be centrifugally thrown out to provide sufficient blood flow.

[0062] See also Figure 3 and Figure 5The liquid inlet channel 132 includes a liquid inlet section 1321 and a liquid flow section 1323 which are connected to each other. The liquid inlet section 1321 is farther away from the receiving chamber 110 than the liquid flow section 1323, that is, the liquid inlet section 1321 is closer to the tube mouth 131 than the liquid flow section 1323, and the pressure measuring hole 1398 is arranged in the liquid flow section 1323. Along the direction from the liquid inlet section 1321 to the liquid flow section 1323, the inner diameter of the liquid inlet section 1321 gradually decreases, so that the liquid inlet section 1321 is roughly in the shape of a trumpet with a wide outside and a narrow inside, wherein the outer side refers to the side close to the tube mouth 131, and the inner side refers to the side away from the tube mouth 131, so that blood can smoothly flow from the tube mouth 131 into the liquid inlet section 1321. In this embodiment, along the direction from the liquid inlet section 1321 to the liquid flow section 1323, the inner diameter of the liquid flow section 1323 remains unchanged, so that the liquid flow section 1323 is roughly in the shape of a cylinder.

[0063] In this embodiment, the liquid inlet channel 132 further includes a liquid outlet section 1325, which is disposed on a side of the liquid flow section 1323 away from the liquid inlet section 1321, and the liquid outlet section 1325 is in communication with the receiving chamber 110. As an example, when the liquid enters the liquid inlet channel 132 from the pipe mouth 131 of the inlet pipe 130, it will sequentially pass through the liquid inlet section 1321, the liquid flow section 1323 and the liquid outlet section 1325, and then flow to the receiving chamber 110, and finally flow out from the outlet pipe 170 under the centrifugal action of the impeller 190, and then can flow to the aorta or the pulmonary artery through the artificial blood vessel.

[0064] The inner tube 134 surrounds the liquid inlet channel 132; the outer tube 136 is sleeved and connected to the inner tube 134, specifically, the end of the outer tube 136 away from the receiving chamber 110 can be fixedly connected to the end of the inner tube 134 away from the receiving chamber 110, wherein the fixing method can be welding or bonding. A receiving chamber 180 is also formed between the outer tube 136 and the inner tube 134, and the receiving chamber 180 can be used to accommodate part of the sensor assembly 12.

[0065] See also Figures 4 to 6 The inner tube 134 includes a tube body 137 and a mounting member 139 arranged along the axial direction, wherein the axial direction refers to the extension direction of the central axis L of the inner tube 134. The tube body 137 and the mounting member 139 cooperate to form a liquid inlet channel 132, wherein a portion of the tube body 137 can form a liquid inlet section 1321 of the liquid inlet channel 132, and the mounting member 139 and another portion of the tube body 137 can form a liquid flow section 1323 of the liquid inlet channel 132.

[0066] In the present embodiment, the radial direction refers to the linear direction of the diameter or radius of the inner tube 134 , or a direction perpendicular to the extending direction of the central axis L. The circumferential direction refers to the circumferential direction around the central axis L of the inner tube 134 .

[0067] In this embodiment, the mounting member 139 is cylindrical. The mounting member 139 is connected to the side of the tube body 137 close to the receiving cavity 110, that is, the mounting member 139 is connected to the side of the tube body 137 away from the nozzle 131. The mounting member 139 and the tube body 137 can be connected by welding or bonding. Specifically, a first annular step 1372 is provided on the side of the tube body 137 away from the nozzle 131, and the first annular step 1372 faces the liquid inlet channel 132. A second annular step 1392 is provided on the side of the mounting member 139 close to the nozzle 131, and the second annular step 1392 faces away from the liquid inlet channel 132. The first annular step 1372 and the second annular step 1392 are adapted to each other, which can reduce the gap at the connection between the tube body 137 and the mounting member 139, and compared with the contact between planes, the contact area between the tube body 137 and the mounting member 139 can be increased, and the connection strength between the two can be increased.

[0068] See also Figures 7 to 10 , the inner circumferential surface 1391 of the mounting member 139 is recessed in the inner wall of the tube body 137 to form a mounting groove 1396 that is connected to the liquid inlet channel 132. In this embodiment, the mounting groove 1396 is cylindrical to match the shape of the mounting member 139, that is, the mounting groove 1396 is provided on the entire inner wall of the mounting member 139. In other embodiments, the mounting groove 1396 may also be in an arc shape, that is, the mounting groove 1396 may also be provided on a portion of the inner wall of the mounting member 139.

[0069] See also Figures 11 to 14 The outer wall surface of the inner tube 134 is provided with a mounting boss 1342, specifically, the outer peripheral surface 1393 of the mounting member 139 is provided with a mounting boss 1342, and the mounting boss 1342 can be used to install the sensor assembly 12. The pressure measuring hole 1398 passes through the mounting boss 1342. In this embodiment, the mounting boss 1342 is generally annular; in other embodiments, the mounting boss 1342 can also be rectangular, elliptical or other shapes, as long as the sensor assembly 12 can be installed.

[0070] A mounting plane 1344 is provided on one side of the mounting boss 1342 away from the liquid inlet channel 132 . The mounting plane 1344 is parallel to the central axis of the inlet pipe 130 and can be used to mount the sensor assembly 12 . The central axis of the inlet pipe 130 is the central axis L of the inner pipe 134 .

[0071] The pressure measuring hole 1398 is provided on the mounting member 139. Specifically, the pressure measuring hole 1398 passes through the mounting boss 1342 and the mounting groove 1396 ( Fig.10 ) of the groove bottom surface 1397 so that the sensing part 1241 can extend into the pressure measuring hole 1398.

[0072] The outer wall surface 1343 of the inner tube 134 includes a tangent plane 1345 and an annular surface 1346 connected to the tangent plane 1345 and extending in the circumferential direction, that is, the tangent plane 1345 and the annular surface 1346 form a closed circumferential surface, wherein the cross section of the annular surface 1436 is in the shape of an arc, the center angle of the arc is between 270° and 360°, so that the arc has an opening; the cross section of the tangent plane 1345 is a straight line, and the straight line closes the opening of the arc. The mounting boss 1342 is arranged on the annular surface 1346; and the mounting plane 1344 of the mounting boss 1342 and the tangent plane 1345 are coplanar. The radial distance between the cutting plane 1345 and the inner wall surface 1361 of the outer tube 136 is made larger than the radial distance between the annular surface 1346 and the inner wall surface 1361 of the outer tube 136. The radial distance between the cutting plane 1345 and the inner wall surface 1361 of the outer tube 136 is defined as L1, and the radial distance between the annular surface 1346 and the inner wall surface 1361 of the outer tube 136 is defined as L2, wherein L1>L2, thereby obtaining a larger space in the accommodating cavity 180 to accommodate the sensor 124 and facilitate the routing of the sensor 124, thereby facilitating the installation of the sensor 124.

[0073] Please continue reading Fig. 9 and Fig.10 In this embodiment, the sensing part 1241 can be aligned with the pressure measuring hole 1398, the pressure measuring hole 1398 is roughly a circular hole, and the sensing part 1241 is roughly a flat cylindrical shape. The alignment of the sensing part 1241 and the pressure measuring hole 1398 means that the central axis of the sensing part 1241 and the central axis of the pressure measuring hole 1398 are roughly coincident, for example, the central axes of the two can coincide or the distance between the central axes of the two is less than 0.2mm. Among them, the central axis of the sensing part 1241 and the central axis of the pressure measuring hole 1398 both extend along the radial direction of the inner tube 134. In one embodiment, the central axis of the sensing part 1241 can also be staggered with the central axis of the pressure measuring hole 1398; for example, the distance between the central axes of the two is greater than 0.2mm. In another embodiment, the sensing portion 1241 is roughly in the shape of a flat cylinder, and the pressure measuring hole 1398 can also be elliptical, rectangular or other shapes, so as to meet the purpose that the position of the sensing portion 1241 corresponds to the position of the pressure measuring hole 1398, and at least a portion of the sensing portion 1241 extends into the pressure measuring hole 1398.

[0074] The sensor assembly 12 further includes a diaphragm 121, which is disposed on one side of the sensing portion 1241 adjacent to the liquid inlet channel 132. Specifically, the diaphragm 121 is disposed between the sensing portion 1241 and the liquid inlet channel 132, so that the sensing portion 1241 of the sensor 124 can sense the blood pressure exerted on the diaphragm 121 to obtain the blood pressure in the liquid inlet channel 132. The pressure measuring hole 1398 penetrates the bottom of the mounting groove 1396. The diaphragm 121 is mounted on the mounting groove 1396 on the mounting member 139 and shields the pressure measuring hole 1398, so that the diaphragm 121 can directly contact the blood flowing in the liquid inlet channel 132. When the blood flows through the liquid inlet channel 132, it will contact the diaphragm 121 disposed on the channel wall of the liquid inlet channel 132, which will generate blood pressure on the diaphragm 121, and prevent the blood in the liquid inlet channel 132 from entering the pressure measuring hole 1398 and causing blood accumulation and thrombosis.

[0075] In this embodiment, the diaphragm 121 is adapted to be installed in the installation groove 1396, that is, the thickness of the diaphragm 121 can be equal to the depth of the installation groove 1396, and the diaphragm 121 and the inner wall surface 1373 of the tube body 137 have a smooth transition, so that the diaphragm 121 will not protrude from the inner wall surface 1373 of the tube body 137, nor will it be sunken in the inner wall surface 1373 of the tube body 137, which can avoid the appearance of grooves or protrusions at the junction of the diaphragm 121 and the tube body 137, thereby preventing the blood in the liquid inlet channel 132 from entering the groove or being stopped by the protrusion, thereby avoiding blood aggregation or retention caused by thrombosis. In the actual production process, the junction of the diaphragm 121 and the tube body 137 can be polished to make the diaphragm 121 and the inner wall surface 1373 of the tube body 137 have a smooth transition.

[0076] In order to transmit the blood pressure to the sensing part 1241, the diaphragm 121 needs to be deformed under the action of the blood pressure, so that the diaphragm 121 needs to have good elasticity and good strength. In this embodiment, the material of the diaphragm 121 is titanium or silicon dioxide. Titanium or silicon dioxide has good biocompatibility on the basis of good elasticity, so that the diaphragm 121 can efficiently transmit the blood pressure to the sensor 124, and also minimize the damage of the material of the diaphragm 121 to the blood. Titanium or silicon dioxide also has high strength, so that the diaphragm 121 has a long service life.

[0077] Since the inner diameter of the liquid flow section 1323 remains unchanged along the direction from the liquid inlet section 1321 to the liquid flow section 1323, the pressure measuring hole 1398 is arranged in the liquid flow section 1323, and the pressure measuring hole 1398 passes through the bottom of the installation groove 1396, that is, the installation groove 1396 is also arranged in the liquid flow section 1323, so that the diaphragm 121 installed in the installation groove 1396 is also installed in the liquid flow section 1323, so that the diaphragm 121 is cylindrical or arc-shaped. Compared with the liquid inlet section 1321 arranged in a bell-mouth shape (the diaphragm 121 needs to be correspondingly arranged in a bell-mouth shape), the shape and size of the diaphragm 121 are better controlled, which is conducive to setting the diaphragm 121 and the inner wall surface 1373 of the tube body 137 to have a smooth transition.

[0078] In this embodiment, the pressure measuring hole 1398 is arranged on the side of the liquid flow section 1323 away from the liquid outlet section 1325, so that the pressure measuring hole 1398 is closer to the tube mouth 131 of the inlet tube 130, and the sensing part 1241 of the sensor 124 can contact the blood in the liquid inlet channel 132 earlier, reducing the pressure loss of blood during the transportation process and improving the accuracy of the measurement results of the sensor 124.

[0079] It should be noted that a soft material (not shown) is also provided between the diaphragm 121 and the sensing part 1241. The soft material can be used for pressure conduction. The soft material can be filled between the diaphragm 121 and the sensing part 1241 and contact both. The blood pressure is conducted to the sensing part 1241 of the sensor 124 through the soft material, so that the sensing part 1241 can sense the blood pressure. Through the conduction effect of the soft material, the deformation of the diaphragm 121 can be more accurately transmitted to the sensing part 1241 of the sensor 124, thereby increasing the accuracy of the detection of the sensing part 1241. In this embodiment, the soft material can be silicone.

[0080] In this embodiment, at least a portion of the sensing portion 1241 extends into the pressure measuring hole 1398 and is spaced from the diaphragm 121, so that the distance between the sensing portion 1241 and the diaphragm 121 is shortened without affecting the deformation of the diaphragm 121, further improving the accuracy of the blood pressure sensed by the sensing portion 1241. In other embodiments, the sensing portion 1241 may also be located outside the pressure measuring hole 1398, and the pressure is transmitted between the diaphragm 121 and the sensing portion 1241 through a soft material.

[0081] Please continue reading Figures 3 to 5The pump housing 100 has a pump top surface 101 facing the inlet pipe 130, and a pump side surface 102 connected to the pump top surface 101. The pump housing 100 is also provided with a liquid inlet 120 connecting the receiving chamber 110 and the liquid inlet channel 132. Specifically, the blood in the liquid inlet channel 132 enters the receiving chamber 110 through the liquid inlet 120. The pump housing 100 also includes a receiving shell 140 and an outer convex ring 150. The outer convex ring 150 is generally in the shape of an annular wall. The outer convex ring 150 is convexly arranged on the side of the receiving shell 140 away from the receiving chamber 110, that is, the outer convex ring 150 is arranged on the pump top surface 101 and surrounds the periphery of the liquid inlet 120. The receiving chamber 110 and the liquid inlet 120 are both arranged on the receiving shell 140. The inlet pipe 130 is connected to a side of the outer convex ring 150 that is away from the receiving shell 140 . Specifically, the outer tube 136 of the inlet pipe 130 is connected to the outer convex ring 150 , and the connection method may be welding or bonding.

[0082] The receiving shell 140 includes a first shell 142 and a second shell 144 connected to each other, and the first shell 142 and the second shell 144 cooperate to form a receiving chamber 110, wherein the first shell 142 is provided with an outer convex ring 150, and the second shell 144 is arranged on the side of the first shell 142 away from the inlet pipe 130. The first shell 142 and the second shell 144 can be connected by welding. The receiving shell 140 is set as the first shell 142 and the second shell 144, so that the impeller 190 is easily assembled in the receiving chamber 110. Specifically, after the impeller 190 is assembled in one of the first shell 142 and the second shell 144, the first shell 142 and the second shell 144 are fixedly connected, and the installation of the impeller 190 can be completed.

[0083] The pump housing 100 further includes an inner convex ring 160, which is generally in the shape of an annular wall. The inner convex ring 160 is convexly arranged on the receiving housing 140, and the inner convex ring 160 is arranged on the pump top surface 101 and surrounds the periphery of the liquid inlet 120, and the inner convex ring 160 can form a liquid outlet section 1325 of the liquid inlet channel 132. The outer convex ring 150 surrounds the inner convex ring 160, and a magnetic ring 15 can be arranged between the outer convex ring 150 and the inner convex ring 160. The magnetic ring 15 can cooperate with the magnet in the impeller 190 to provide a force for the impeller 190 to suspend in the receiving chamber 110. The inner convex ring 160 is connected to the inlet pipe 130, and specifically, the inner convex ring 160 is connected to the mounting member 139 of the inlet pipe 130, that is, the mounting member 139 is connected between the pipe body 137 and the inner convex ring 160. The connection method between the inner convex ring 160 and the mounting member 139 can be the same as the connection method between the tube body 137 and the mounting member 139, that is, the cooperation is achieved through two annular steps, thereby increasing the contact area between the inner convex ring 160 and the mounting member 139, thereby increasing the connection strength between the inner convex ring 160 and the mounting member 139.

[0084] The inner circumferential surface 1391 of the mounting member 139 is farther away from the central axis of the inlet pipe 130 relative to the inner wall surface 1373 of the tube body 137 and the inner wall surface 161 of the inner convex ring 160, so that the inner circumferential surface 1391 of the mounting member 139 is radially recessed outward relative to the inner wall surface 1373 of the tube body 137 or the inner wall surface 161 of the inner convex ring 160 to form a mounting groove 1396, wherein the depth of the recess is equal to the thickness of the diaphragm 121, so that the diaphragm 121 can smoothly transition with the inner wall surface 1373 of the tube body 137 after being installed in the mounting groove 1396.

[0085] The ventricular assist device 1 also includes a drive motor 11 and a controller 14. The drive motor 11 is connected to the pump housing 100, and the drive motor 11 can drive the impeller 190 to rotate, so that the blood in the ventricle or atrium can enter the receiving chamber 110 from the inlet tube 130, and then flow out from the outlet tube 170 after the centrifugal action of the impeller 190, and flow to the aorta or pulmonary artery through the artificial blood vessel. The controller 14 is electrically connected to the drive motor 11 and the sensor 124 to control the drive motor 11 to adjust the speed of the impeller 190 according to the blood pressure. The adjustment of the speed of the impeller 190 will affect the size of the blood flow, thereby facilitating the ventricular assist device 1 to provide a suitable blood flow to meet the patient's demand for blood flow at different times.

[0086] The controller 14 is electrically connected to the drive motor 11 and the sensor 124, so that the controller 14 can control the drive motor 11 to adjust the speed of the impeller 190 according to the blood pressure. For example, when it is detected that the blood pressure is too high, the controller 14 can reduce the current or voltage of the drive motor 11 to reduce the speed of the impeller 190, thereby reducing the blood flow to adapt to the less blood flow required in the later stage of implantation of the ventricular assist device 1; on the contrary, when it is detected that the blood pressure is too low, the controller 14 can increase the current or voltage of the drive motor 11 to increase the speed of the impeller 190, thereby increasing the blood flow to adapt to the larger blood flow required in the early stage of implantation of the ventricular assist device 1.

[0087] The driving motor 11 includes a driving shell 112 connected to the pump housing 100, specifically, the driving shell 112 is connected to the second shell 144. The driving shell 112 is provided with a driving cavity 1121 spaced apart from the receiving cavity 110, and the driving cavity 1121 is used to install structures such as the motor stator and the controller 14. The second shell 144 can seal the driving cavity 1121 to minimize the impact of external factors such as water vapor and dust on the motor stator and extend the service life of the motor stator. The controller 14 is arranged in the driving cavity 1121, which can reduce the impact of external factors on the controller 14 and extend the service life of the controller 14. The controller 14 is arranged in the driving cavity 1121, which also improves the integration of the ventricular assist device 1, avoids the controller 14 being arranged outside the body, and causes the cable connected to the controller 14 to increase the diameter of the percutaneous cable passing through the skin tissue, thereby avoiding the patient's skin tissue opening being too large, and reducing the patient's pain.

[0088] Please continue reading Figures 3 to 5 The sensor assembly 12 can measure the blood pressure in the liquid inlet channel 132, so as to obtain the blood flow according to different blood pressures, thereby meeting the patient's needs for blood flow at different times.

[0089] The sensor 124 is a pressure sensor. The sensor 124 is disposed between the inner tube 134 and the outer tube 136, that is, the sensor 124 is disposed in the accommodating chamber 180, so that the sensor 124 can be isolated from the blood in the liquid inlet channel 132 and the external environment, thereby minimizing the impact of external factors on the service life of the sensor 124 and extending the service life of the sensor 124.

[0090] The sensor assembly 12 also includes a cable 126, which is connected between the sensor 124 and the controller 14. The drive housing 112 is also provided with a first wire hole 1122 connected to the drive cavity 1121. The cable 126 is passed through the first wire hole 1122. One end of the cable 126 is connected to the sensor 124, and the other end is connected to the controller 14. In this way, the sensor 124 between the outer tube 136 and the inner tube 134 is electrically connected to the controller 14 in the drive cavity 1121 through the cable 126, so that the controller 14 can receive the blood pressure in the liquid inlet channel 132 sensed by the sensor 124. It should be noted that in order to prevent blood from entering the drive cavity 1121 through the first wire hole 1122 and causing damage to the drive motor 11, the first wire hole 1122 can be blocked by materials such as silicone or glue, and the cable 126 can be further fixed while sealing the first wire hole 1122.

[0091] In this embodiment, the pump top surface 101 is provided with a wire groove 1421, specifically, the surface of the first housing 142 facing the outer convex ring 150 is provided with a wire groove 1421. One end of the wire groove 1421 is adjacent to the outer convex ring 150, and the other end of the wire groove 1421 extends radially to the pump side 102. At least part of the cable 126 is accommodated in the wire groove 1421, which can reduce the exposure of the cable 126 and make the overall appearance of the ventricular assist device 1 more concise. It should be noted that the wire groove 1421 can also accommodate silica gel or glue, etc. The silica gel or glue can fill the wire groove 1421 and shield and fix the cable 126, reduce the shaking of the cable 126, and thus reduce the probability of the cable 126 being separated from the sensor 124 due to the pulling of external force.

[0092] See also Figure 5 and Fig.12 , the sensor 124 also includes a substrate 1242, the substrate 1242 is in the shape of a flat plate, the sensing part 1241 is mounted on the substrate 1242, and is electrically connected to the substrate 1242. The substrate 1242 is attached to the mounting plane 1344, so that the mounting plane 1344 of the substrate 1242 and the mounting boss 1342 is in planar contact, which increases the contact area between the substrate 1242 and the mounting boss 1342, thereby increasing the connection strength between the two. In this embodiment, the substrate 1242 and the mounting boss 1342 can be connected by welding. In other embodiments, the substrate 1242 and the mounting boss 1342 can be connected by bonding.

[0093] See also Fig.11 The outer convex ring 150 is provided with a second wire hole 151 for the cable 126 to pass through, and the second wire hole 151 is adjacent to one end of the wire receiving groove 1421. Specifically, the cable 126 can pass through the second wire hole 151 from the receiving chamber 180 and extend to the outside of the ventricular assist device 1, and at least partially be received in the wire receiving groove 1421, and then pass through the first wire hole 1122 until it is connected with the controller 14 in the driving chamber 1121. In this embodiment, the outer peripheral surface 155 of the outer convex ring 150 is provided with an expansion groove 153. It should be noted that the expansion groove 153 can accommodate silica gel or glue, etc. The silica gel or glue can fill the expansion groove 153 and cover and fix the cable 126, reduce the shaking of the cable 126, and further reduce the probability of the cable 126 being separated from the sensor 124 due to the pulling of external force. The provision of the expansion groove 153 can also increase the threading space, so that the cable 126 can pass through the second wire hole 151 smoothly. In order to prevent blood from entering the accommodating cavity 180 through the second wire hole 151 and causing blood retention, the second wire hole 151 can be sealed with materials such as silicone or glue, and the cable 126 can be further fixed while sealing the second wire hole 151.

[0094] In summary, the ventricular assist device 1 provided in this embodiment is configured such that the sensor 124 is disposed at the inlet pipe 130 of the pump housing 100, the diaphragm 121 is disposed in the liquid inlet channel 132 of the inlet pipe 130, and the sensing portion 1241 is disposed at the side of the diaphragm 121 away from the liquid inlet channel 132, so that the sensing portion 1241 of the sensor 124 can sense the blood pressure exerted on the diaphragm 121 to obtain the blood pressure in the liquid inlet channel 132. The controller 14 controls the driving motor 11 to adjust the speed of the impeller 190 according to the blood pressure sensed by the sensor 124. The adjustment of the speed of the impeller 190 will affect the size of the blood flow, thereby facilitating the ventricular assist device 1 to provide a suitable blood flow to meet the patient's blood flow requirements at different times.

[0095] Second embodiment

[0096] See also Figures 15 to 17 The present embodiment provides a ventricular assist device 2, comprising a pump body 20, a drive motor 21, a sensor assembly 22 and a controller 24. The pump body 20 comprises a pump housing 200 and an impeller 290. The pump housing 200 is provided with a receiving chamber 210 and an inlet pipe 230. The inlet pipe 230 has a liquid inlet channel 232 communicating with the receiving chamber 210. The impeller 290 is rotatably disposed in the receiving chamber 210. The drive motor 21 is connected to the pump housing 200, and the drive motor 21 can drive the impeller 290 to rotate. The sensing component 22 includes a diaphragm 221 and a sensor 224, the diaphragm 221 is arranged in the liquid inlet channel 232; the sensor 224 is arranged in the inlet pipe 230, and the sensor 224 includes a sensing part 2241, and the sensing part 2241 is arranged on the side of the diaphragm 221 away from the liquid inlet channel 232 to sense the blood pressure exerted on the diaphragm 221; the controller 24 is electrically connected to the drive motor 21 and the sensor 224 to control the drive motor 21 to adjust the rotation speed of the impeller 290 according to the blood pressure.

[0097] The inlet tube 230 includes an inner tube 234 and an outer tube 236, wherein the inner tube 234 includes a tube body 237 and a mounting member 239 disposed on the tube body 237, and the inner tube 234 encloses a liquid inlet channel 232. Different from the ventricular assist device 1 of the first embodiment, the tube body 237 of the inlet tube 230 of the ventricular assist device 2 provided in this embodiment is longer. The side wall of the tube body 237 is provided with an assembly port 2371, which is in communication with the liquid inlet channel 232, and the mounting member 239 is in the shape of a cover plate and is covered on the assembly port 2371 to enclose the liquid inlet channel 232 with the tube body 237. The mounting member 239 has an inner plate surface 2391 facing the liquid inlet channel 232, and the inner plate surface 2391 smoothly transitions with the inner wall surface 2373 of the tube body 237, that is, the side wall of the mounting member 239 will not protrude from the inner wall surface 2373 of the tube body 237, nor will it be sunken in the inner wall surface 2373 of the tube body 237, which can avoid the appearance of grooves or protrusions at the junction of the mounting member 239 and the tube body 237, thereby preventing the blood in the liquid inlet channel 232 from entering the grooves or being stopped by the protrusions, thereby avoiding blood aggregation or retention caused by thrombosis. In the actual production process, the junction of the mounting member 239 and the tube body 237 can be polished to make the mounting member 239 and the inner wall surface 2373 of the tube body 237 smoothly transition.

[0098] In this embodiment, the mounting member 239 has an outer plate surface 2392 facing away from the liquid inlet channel 232, and the outer plate surface 2392 and the outer wall surface 2374 of the tube body 237 have a smooth transition, so that no protrusion appears at the joint between the mounting member 239 and the tube body 237, which is conducive to the fixed connection between the mounting member 239 and the tube body 237. As an example, before the mounting member 239 and the tube body 237 are fixed (such as welding), the mounting member 239 and the tube body 237 are first docked, and when the outer plate surface 2392 of the mounting member 239 and the outer wall surface 2374 of the tube body 237 have a smooth transition, it means that the mounting member 239 and the tube body 237 have been docked in place, and the mounting member 239 and the tube body 237 can be welded at this time.

[0099] See also Figures 16 to 19The outer tube 236 is sleeved and connected to the inner tube 234. Specifically, the end of the outer tube 236 away from the receiving chamber 210 can be fixedly connected to the end of the inner tube 234 away from the receiving chamber 210, and the fixing method can be welding or bonding. A receiving chamber 280 is also formed between the outer tube 236 and the inner tube 234, and the receiving chamber 280 can be used to accommodate part of the sensor assembly 22. The pump housing 200 also includes an outer convex ring 250 and an inner convex ring 260. The outer convex ring 250 and the inner convex ring 260 are both roughly in the shape of an annular wall. The outer convex ring 250 surrounds the inner convex ring 260. The outer convex ring 250 is connected to the outer tube 236, and the inner convex ring 260 is connected to the inner tube 234. Specifically, the inner convex ring 160 is connected to the tube body 237 of the inner tube 230. The outer convex ring 250 and the outer tube 236 , as well as the inner convex ring 260 and the tube body 237 , can be connected by welding or bonding.

[0100] In this embodiment, the assembly opening 2371 is also connected to the accommodating cavity 280, that is, the assembly opening 2371 is a through hole provided on the side wall of the mounting member 239. In other embodiments, the assembly opening 2371 is not connected to the accommodating cavity 280, that is, the assembly opening 2371 is a blind hole provided on the side wall of the mounting member 239, which can meet the installation purpose of the mounting member 239, and can be specifically set according to actual conditions.

[0101] The inner plate surface 2391 of the mounting member 239 facing the liquid inlet channel 232 is provided with a mounting groove 2396, and the diaphragm 221 is installed in the mounting groove 2396, and the diaphragm 221 and the inner wall surface 2373 of the tube body 237 have a smooth transition, and the diaphragm 221 also has a smooth transition with the side wall of the mounting member 239, that is, the diaphragm 221, the inner wall surface 2373 of the tube body 237 and the side wall of the mounting member 239 have a smooth transition to avoid blood clots caused by blood aggregation or retention. In this embodiment, the mounting groove 2396 is provided on a part of the side wall of the mounting member 239. In other embodiments, the mounting groove 2396 can also be provided on the entire side wall of the mounting member 239.

[0102] The mounting member 239 is also provided with a pressure measuring hole 2398, which passes through the bottom surface of the mounting groove 2396. The diaphragm 221 shields the pressure measuring hole 2398 to prevent the blood in the liquid inlet channel 232 from entering the pressure measuring hole 2398 and causing blood accumulation and thrombosis.

[0103] In summary, the ventricular assist device 2 provided in this embodiment is configured such that the sensor 224 is disposed at the inlet pipe 230 of the pump housing 200, the diaphragm 221 is disposed in the liquid inlet channel 232 of the inlet pipe 230, and the sensing portion 2241 is disposed at the side of the diaphragm 221 away from the liquid inlet channel 232, so that the sensing portion 2241 of the sensor 224 can sense the blood pressure exerted on the diaphragm 221 to obtain the blood pressure in the liquid inlet channel 232. The controller 24 controls the driving motor 21 to adjust the speed of the impeller 290 according to the blood pressure sensed by the sensor 224. The adjustment of the speed of the impeller 290 will affect the size of the blood flow, thereby facilitating the ventricular assist device 2 to provide an appropriate blood flow to meet the patient's blood flow requirements at different times.

[0104] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A ventricular assist device, characterized in that: include: A pump body, the pump body comprising a pump casing and an inlet pipe, the pump casing being provided with a receiving chamber; the inlet pipe being connected to the pump casing and having a liquid inlet passage communicating with the receiving chamber; the inlet pipe comprising an inner tube defining the liquid inlet passage and an outer tube surrounding the inner tube, the side wall of the inner tube being provided with a pressure measuring hole communicating with the liquid inlet passage; as well as The sensor assembly includes a sensor, the sensor is arranged between the inner tube and the outer tube, and the sensor includes a sensing part, the sensing part is arranged corresponding to the pressure measuring hole so that the sensor can sense the blood pressure in the liquid inlet channel.

2. The ventricular assist device according to claim 1, characterized in that: The sensor assembly also includes a diaphragm, which is arranged on a side of the sensing part adjacent to the liquid inlet channel; the inner wall surface of the inner tube is provided with a mounting groove, the pressure measuring hole passes through the bottom of the mounting groove, and the diaphragm is installed in the mounting groove.

3. The ventricular assist device according to claim 1, wherein: The liquid inlet channel includes a liquid inlet section and a liquid flow section that are connected to each other. The liquid inlet section is away from the receiving chamber relative to the liquid flow section, and the inner diameter of the liquid inlet section gradually decreases along the direction from the liquid inlet section to the liquid flow section, while the inner diameter of the liquid flow section remains unchanged. The pressure measuring hole is arranged in the liquid flow section.

4. The ventricular assist device according to claim 3, characterized in that: The liquid inlet channel also includes a liquid outlet section, which is arranged on a side of the liquid flow section away from the liquid inlet section, the liquid outlet section is connected to the receiving cavity, and the pressure measuring hole is arranged on a side of the liquid flow section away from the liquid outlet section.

5. The ventricular assist device according to claim 1, wherein: The ventricular assist device further comprises an impeller, a drive motor and a controller, wherein the impeller is rotatably disposed in the receiving cavity; the drive motor is connected to the pump housing, and the drive motor can drive the impeller to rotate; The controller is electrically connected to the driving motor and the sensor to control the driving motor to adjust the rotation speed of the impeller according to the blood pressure.

6. The ventricular assist device according to claim 5, characterized in that: The sensing assembly further includes a cable connecting the sensor and the controller; the driving motor includes a driving shell connected to the pump shell, the driving shell is provided with a driving cavity spaced from the receiving cavity, and a first wire hole communicating with the driving cavity; the controller is arranged in the driving cavity; The cable is passed through the first cable hole.

7. The ventricular assist device according to claim 5, characterized in that: The sensing assembly also includes a cable connecting the sensor and the controller; the pump housing is provided with a liquid inlet connecting the accommodating chamber and the liquid inlet channel; the pump housing has a pump top surface facing the inlet pipe, and the pump top surface is provided with an outer convex ring surrounding the periphery of the liquid inlet, the outer convex ring is connected to the outer tube, and the outer convex ring is provided with a second wire hole for the cable to pass through.

8. The ventricular assist device according to claim 7, characterized in that: The pump housing also has a pump side surface connected to the pump top surface; the pump top surface is provided with a wire accommodating groove, one end of the wire accommodating groove is adjacent to the second wire hole, and the other end of the wire accommodating groove extends radially to the pump side surface, and at least part of the cable is accommodated in the wire accommodating groove; and / or, the outer peripheral surface of the outer convex ring is provided with an expansion groove, and the expansion groove surrounds the outer periphery of the second wire hole.

9. The ventricular assist device according to any one of claims 1 to 8, characterized in that: The inner tube of the inlet pipe includes a tube body and a mounting member; wherein, an assembly opening is opened on the side wall of the tube body; the mounting member is in the shape of a cover plate and is covered on the assembly opening to enclose the liquid inlet channel with the tube body; the pressure measuring hole is arranged on the mounting member.

10. The ventricular assist device according to claim 9, characterized in that: The mounting member has an inner plate surface facing the liquid inlet channel, and the inner plate surface smoothly transitions with the inner wall surface of the tube body; and / or, The mounting member has an outer plate surface facing away from the liquid inlet channel, and the outer plate surface smoothly transitions with the outer wall surface of the tube body.

11. The ventricular assist device according to claim 9, characterized in that: An inner plate surface of the mounting member facing the liquid inlet channel is provided with a mounting groove, and the sensor assembly further comprises a diaphragm arranged between the sensing portion and the liquid inlet channel, and the diaphragm is installed in the mounting groove.

12. The ventricular assist device according to claim 11, characterized in that: The ventricular assist device further comprises at least one of the following features: The pressure measuring hole passes through the bottom surface of the installation groove, and the diaphragm covers the pressure measuring hole; The diaphragm has a smooth transition with the inner wall surface of the tube body; The material of the diaphragm is titanium or silicon dioxide.

13. The ventricular assist device according to any one of claims 1 to 8, characterized in that: The pump housing is provided with a liquid inlet connecting the accommodating cavity and the liquid inlet channel; the pump housing has a pump top surface facing the inlet pipe, and the pump top surface is provided with an inner convex ring surrounding the periphery of the liquid inlet; the inner tube includes a tube body and a mounting member arranged along the axial direction, the mounting member is cylindrical and connected between the tube body and the inner convex ring, and the pressure measuring hole is arranged on the mounting member.

14. The ventricular assist device according to claim 13, characterized in that: The inner circumferential surface of the mounting piece is farther away from the central axis of the inlet pipe relative to the inner wall surface of the tube body and the inner wall surface of the inner convex ring, so that the inner circumferential surface of the mounting piece is radially recessed outward relative to the inner wall surface of the tube body or the inner wall surface of the inner convex ring to form a mounting groove; the sensor assembly also includes a diaphragm, which is installed in the mounting groove, and the diaphragm has a smooth transition with the inner wall surface of the tube body.

15. The ventricular assist device according to any one of claims 1 to 8, characterized in that: The outer wall surface of the inner tube is convexly provided with a mounting boss, the pressure measuring hole passes through the mounting boss, a mounting plane is provided on the side of the mounting boss away from the liquid inlet channel, the sensor also includes a substrate, the sensing part is mounted on the substrate, and the substrate is attached to the mounting plane.

16. The ventricular assist device according to claim 15, characterized in that: The outer wall surface of the inner tube includes a cutting plane and a circumferential surface connected to the cutting plane and extending in the circumferential direction; the mounting boss is arranged on the circumferential surface, and the mounting plane of the mounting boss is coplanar with the cutting plane.

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