Ventricular assist pump cannula and ventricular assist device

Abstract

The application discloses a kind of ventricular auxiliary pumping blood cannula, it is related to medical instrument field, tail is used to be connected with the aorta outside heart, and connect pumping blood power source, head is used to be inserted into left ventricle;When the pumping capacity of patient's heart is insufficient, start pumping blood power source, can left ventricular blood be pumped into, and then flow through cannula body, blood outlet into the aorta outside heart, again flow to the whole body in succession.The pigtail flexible protrusion of original cannula head is removed in the application, and pressure detection device is used instead of artificial experience, the pressure sensed by cannula can be quantified, and the lateral partial pressure and axial partial pressure of cannula head are accurately displayed in real time, avoid the blood inlet and the inner wall of heart to be combined in pumping process, it is favorable to improve auxiliary pumping effect, while it can avoid thrombus formation in auxiliary pumping process.The application also discloses a kind of ventricular auxiliary device, comprising pumping blood power source and the above-mentioned ventricular auxiliary pumping blood cannula.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a cannula for ventricular assist pump blood and a ventricular assist device. BACKGROUND

[0002] Heart failure, referred to as "heart failure" for short, is a syndrome mainly caused by circulatory dysfunction due to diastolic and / or systolic dysfunction of myocardium, which is insufficient to maintain tissue metabolic needs under the condition of appropriate venous return. For heart failure patients, the commonly used treatment scheme is surgical intervention, but this treatment scheme has high risk, large trauma to patients and high medical cost. The emergence of interventional artificial heart technology breaks this dilemma.

[0003] Interventional artificial heart technology, also known as "pVAD technology", is to place a small blood pump into the heart through percutaneous intervention, and to realize partial or complete replacement of heart pumping function by the action of the blood pump to drain blood into the arterial system, thereby maintaining the function of blood circulation in the human body. The pVAD product, i.e. the interventional ventricular assist device, has high reliability requirements and is one of the most difficult medical devices in product safety and effectiveness system evaluation in medical device registration. The current pVAD product is safe and easy to operate, and is not easy to cause complications such as embolism and bleeding that adversely affect the downstream organs, which is an advanced minimally invasive ventricular assist technology that can be applied to cardiogenic shock, high-risk PCI surgery protection, heart failure and other indications, and helps to improve the survival rate of related patients.

[0004] When the pVAD product is used, the cannula head is inserted into the left ventricle, and the cannula head should not be pressed on the inner wall of the ventricle. The existing cannula is provided with a flexible protrusion wound in a pigtail shape at the cannula head, i.e. the front end of the cannula liquid inlet. The flexible protrusion can support on the inner wall of the ventricle during the process of pumping blood in the left ventricle, so as to separate the cannula head from the inner wall of the ventricle. During this process, the cannula head is roughly judged to be in contact with the endocardium by relying on the doctor's sense of touch, experience, or three-dimensional measurement system, which has poor reliability and easily increases the risk of surgery. In addition, due to the long time of the flexible protrusion immersed in the flowing blood during the blood pumping process, blood clots (thrombus) are easily formed at the flexible protrusion, which further increases the risk of surgery.

[0005] Therefore, it is necessary to propose a new type of pVAD product, which can accurately quantify the pressure sensed by the cannula head, so as to solve the problem that the existing action force between the cannula head and the inner wall of the ventricle is roughly judged by relying on the doctor's sense of touch, experience, or three-dimensional measurement system, which has poor reliability and easily increases the risk of surgery. SUMMARY

[0006] The application aims to provide a ventricular assist pump blood cannula and a ventricular assist device to solve the problem that the force between the head of the existing cannula and the inner wall of the ventricle is determined by the doctor's feeling and experience or a three-dimensional measurement system, which is rough and unreliable, and easily increases the risk of surgery.

[0007] To achieve the above-mentioned purpose, the application provides the following solutions.

[0008] The application provides a ventricular assist pump blood cannula, comprising:

[0009] A cannula body, a blood inlet is arranged at the head of the cannula body, a blood outlet is arranged at the tail of the cannula body, the head of the cannula body is used for inserting into the left ventricle of the heart, the tail of the cannula body is used for accessing the external aorta of the heart, and the cannula body is used for being connected with a blood pumping power source to guide the blood in the left ventricle of the heart into the external aorta of the heart;

[0010] A pressure detection device, which is arranged at the head of the cannula body and located at the side of the blood inlet away from the tail of the cannula body, and is used for detecting the pressure borne by the head of the cannula body.

[0011] Optionally, the cannula body comprises:

[0012] A blood flow hose;

[0013] A head tubular joint, a first end of the head tubular joint is in communication with the head of the blood flow hose, a guide head is arranged at the second end of the head tubular joint, and the blood inlet is arranged on the side wall of the head tubular joint between the first end and the second end; and the pressure detection device is arranged on the guide head;

[0014] A tail tubular joint, a first end of the tail tubular joint is in communication with the tail of the blood flow hose, the second end of the tail tubular joint is used for connecting the blood pumping power source, and the blood outlet is arranged on the side wall of the tail tubular joint between the first end and the second end.

[0015] Optionally, the blood flow hose comprises an elastic hose and a hose skeleton, the hose skeleton is embedded in the pipe wall of the elastic hose; wherein the hose skeleton comprises a plurality of metal rings arranged along the axial direction of the elastic hose, or the hose skeleton is spirally wound by a metal sheet.

[0016] Optionally, the material of the elastic hose is a soft biocompatible material such as TPU or TPE. The metal ring is a stainless steel ring, a nickel-titanium alloy ring or a platinum-iridium alloy ring.

[0017] Optionally, the tail tubular joint and the blood flow hose are connected by heat flow glue curing.

[0018] Optionally, the blood flow hose is bent at a position 1 / 3 of the length of the head part, so that the head part and the tail part of the blood flow hose are arranged at an angle of 35-55 degrees.

[0019] Optionally, the guide head is a circular blunt head, a flow guide cone is arranged in the head part tubular joint, the flow guide cone is connected with the circular blunt head, and the tip of the flow guide cone is arranged towards the blood flow hose.

[0020] Optionally, the pressure detection device comprises a developing ring and a pressure sensor, the developing ring is sleeved on the guide head, and the pressure sensor is arranged on the guide head.

[0021] The application further provides a ventricular assist device, which comprises a blood pumping power source and the ventricular assist pumping cannula as described above, and the blood pumping power source is arranged at the second end of the tail part tubular joint.

[0022] Optionally, the blood pumping power source comprises:

[0023] A impeller, the impeller is arranged in the tail part tubular joint, the impeller comprises an impeller shaft arranged coaxially with the tail part tubular joint and a plurality of blades arranged at the outer periphery of the impeller shaft;

[0024] An electric machine, the output end of the electric machine is connected with the impeller shaft, and the second end of the tail part tubular joint and the impeller shaft are both sealedly connected with the shell of the electric machine.

[0025] Optionally, the impeller shaft is a conical impeller shaft, the large end of the conical impeller shaft is arranged towards the electric machine, and the small end of the conical impeller shaft is arranged towards the blood flow hose.

[0026] Optionally, one end of each of the blades near the small end of the conical impeller shaft is spirally deflected, and the blades at the outer periphery of the impeller shaft are uniformly distributed along the circumference of the impeller shaft.

[0027] The application has the following technical effects relative to the prior art:

[0028] The invented ventricular auxiliary pumping cannula has novel and reasonable structure, the tail part is used for connecting with the external aorta of the heart and connecting the pumping power source, and the head part is used for inserting into the left ventricle; when the pumping capacity of the heart of the patient is insufficient, the pumping power source is started to pump the blood in the left ventricle through the blood inlet, and then the blood flows through the cannula body, the blood outlet and the external aorta of the heart, and then flows to the whole body. The head part of the cannula body cannot press on the endocardium of the left ventricle during pumping, and the position of the cannula body in the heart and the abutting condition of the head part of the cannula on the endocardium can be judged by the pressure detection device. The pig-tail flexible protrusion of the head part of the original cannula is removed, the pressure detection device is used to replace the artificial experience, the pressure sensed by the cannula can be quantified, and the lateral partial pressure and the axial partial pressure of the head part of the cannula can be displayed in real time and accurately, so that the blood inlet is not abutted on the inner wall of the heart during pumping, and the auxiliary pumping effect is improved. Meanwhile, the pig-tail flexible protrusion of the head part of the cannula is removed, so that the thrombus is not formed during the auxiliary pumping.

[0029] The invented ventricular auxiliary device comprises the pumping power source and the above-mentioned ventricular auxiliary pumping cannula, and the position of the cannula body in the heart and the abutting condition of the head part of the cannula on the endocardium can be judged by the pressure detection device. The pig-tail flexible protrusion of the head part of the original cannula is removed, the pressure detection device is used to replace the artificial experience, the pressure sensed by the cannula can be quantified, and the lateral partial pressure and the axial partial pressure of the head part of the cannula can be displayed in real time and accurately, so that the blood inlet is not abutted on the inner wall of the heart during pumping, and the auxiliary pumping effect is improved. Meanwhile, the pig-tail flexible protrusion of the head part of the cannula is removed, so that the thrombus is not formed during the auxiliary pumping. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0031] Figure 1 The structure schematic diagram of the ventricular auxiliary pumping cannula disclosed by the embodiments of the present application;

[0032] Figure 2 The structure schematic diagram of the ventricular auxiliary device disclosed by the embodiments of the present application; Figure 1 The structure enlarged view of the position A in the figure;

[0033] Figure 3 The structure enlarged view of the position B in the figure; Figure 1 The structure enlarged view of the position B in the figure;

[0034] Figure 4 The structure schematic diagram of the ventricular auxiliary device disclosed by the embodiments of the present application;

[0035] Figure 5 Assembling diagram of the pump blood power source and the ventricular assist pump blood cannula disclosed by the embodiment of the present application;

[0036] Figure 6 Structural diagram of the pump blood power source in the ventricular assist device disclosed by the embodiment of the present application;

[0037] Figure 7 Structural diagram of the impeller in the pump blood power source disclosed by the embodiment of the present application.

[0038] In the drawings, the reference signs are as follows:

[0039] 100, ventricular assist pump blood cannula; 101, cannula body; 102, blood flow hose; 103, head tubular joint; 104, guide head; 105, blood inlet; 106, tail tubular joint; 107, blood outlet; 108, elastic hose; 109, metal ring; 110, flow guide cone; 111, developing ring; 112, pressure sensor;

[0040] 200, ventricular assist device; 201, pump blood power source; 202, impeller; 203, motor; 204, impeller shaft; 205, blade. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0042] One of the purposes of the present application is to provide a ventricular assist pump blood cannula, so as to mainly solve the problem that the force between the head of the existing cannula and the inner wall of the ventricle is completely judged by the doctor's hand feeling, experience, or three-dimensional mapping system, the reliability is poor, and the surgical risk is easily increased.

[0043] Another purpose of the present application is to provide a ventricular assist device, so as to mainly solve the problem that the force between the head of the existing cannula and the inner wall of the ventricle is completely judged by the doctor's hand feeling, experience, or three-dimensional mapping system, the reliability is poor, and the surgical risk is easily increased.

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0045] Embodiment one

[0046] As Figures 1-3As shown, the embodiment provides a cannula 100 for ventricular assist pumping, which comprises a cannula body 101 and a pressure detection device, a head of the cannula body 101 is provided with an inlet 105, a tail of the cannula body 101 is provided with an outlet 107, the head of the cannula body 101 is used for insertion into the left ventricle of the heart, the tail of the cannula body 101 is used for access to the aorta outside the heart, the cannula body 101 is used for connection with a blood pumping power source 201 to guide the blood in the left ventricle of the heart into the aorta outside the heart, so as to realize ventricular assist pumping. The pressure detection device is arranged at the head of the cannula body 101 and located on the side of the inlet 105 away from the tail of the cannula body 101, and is used for detecting the pressure on the head of the cannula body 101.

[0047] In the embodiment, the cannula body 101 specifically comprises a blood passing hose 102, a head tubular joint 103 and a tail tubular joint 106, an axial first end of the head tubular joint 103 is in communication with the head (i.e. the liquid inlet end) of the blood passing hose 102, an axial second end of the head tubular joint 103 is provided with a guide head 104, the head tubular joint 103 is provided with the inlet 105 on the side wall between the axial first end and the axial second end thereof, and the aforementioned pressure detection device is arranged on the guide head 104, specifically on the outside of the guide head 104. An axial first end of the tail tubular joint 106 is in communication with the tail (i.e. the liquid outlet end) of the blood passing hose 102, an axial second end of the tail tubular joint 106 is used for connection with the blood pumping power source 201, and the tail tubular joint 106 is provided with the outlet 107 on the side wall between the axial first end and the axial second end thereof. As a whole, the aforementioned inlet 105 and outlet 107 are both provided on the side wall of the cannula body 101.

[0048] In the embodiment, the blood passing hose 102 comprises an elastic hose 108 and a hose skeleton, the hose skeleton is embedded in the pipe wall of the elastic hose 108, i.e. the inside and outside of the hose skeleton are both covered by the hose structure. The aforementioned hose skeleton can adopt the following two forms:

[0049] The first form: the hose skeleton comprises a plurality of metal rings 109 arranged along the axial direction of the elastic hose 108. In this structure, the material of the elastic hose 108 is preferably TPU (thermoplastic polyurethane elastomer rubber) or TPE (thermoplastic elastomer material) or other soft biocompatible materials. The metal ring 109 is preferably a stainless steel ring, a nickel-titanium alloy ring or a platinum-iridium alloy ring. The elastic hose 108 and the metal ring 109 are combined by refolw, heat shrinkage and laminar flow, so that the shaft of the blood passing hose 102 is flexible and easy to control, and the positioning and stability of the head of the cannula body 101 are increased.

[0050] The second form: the soft tube skeleton is spirally wound by metal sheet, similar to spring structure. In this form, the material of the elastic soft tube 108 is preferably TPU (thermoplastic polyurethane elastomer rubber) or TPE (thermoplastic elastomer material) and other soft biocompatible materials. The metal sheet is preferably stainless steel, nickel-titanium alloy or platinum-iridium alloy. The elastic soft tube 108 and the spiral soft tube skeleton are combined by refolw, hot shrinkage layer flow mode, so that the shaft of the blood passing soft tube 102 is flexible and easy to control, and the stability of the head of the cannula body 101 is increased.

[0051] In this embodiment, the tail tubular joint 106 and the blood passing soft tube 102 are connected together in the form of heat flow glue curing. When curing, a curing ring is formed to smooth the connection between the tail tubular joint 106 and the blood passing soft tube 102. Similarly, the head tubular joint 103 and the blood passing soft tube 102 can also be connected together in the form of heat flow glue curing, and a curing ring is formed at the connection.

[0052] In this embodiment, the blood passing soft tube 102 is bent at a distance of 1 / 3 of its length from the head, so that the head (i.e. the liquid inlet end) and the tail (i.e. the liquid outlet end) of the blood passing soft tube 102 are arranged at an angle α, as shown in Figure 1 The angle α is the angle between the 1 / 3 length segment of the head of the blood passing soft tube 102 and the 2 / 3 length segment of the tail, and the angle α is preferably 35°-55°. The blood passing soft tube 102 is bent at 45°±10° at a distance of 1 / 3 of its length, in order to simulate the shape of the connection of the blood vessel to the heart, and to avoid adverse reactions such as damage to the blood vessel wall and the endocardium due to cannula rigidity. As a preferred solution, the angle α can be 35°, 45° or 55°. In the above example, the length of the blood passing soft tube 102 (excluding the axial length of the head tubular joint 103 and the tail tubular joint 106) is taken as the reference, and the bending is at a distance of 1 / 3 of the length from the head to the tail. In actual operation, if the length of the cannula body 101 (which is the sum of the axial lengths of the head tubular joint 103, the blood passing soft tube 102 and the tail tubular joint 106) is taken as the reference, the above bending at a distance of 1 / 3 of the axial length from the head to the tail is still applicable.

[0053] In this embodiment, the guide head 104 is a circular blunt head, which can avoid damaging internal organs when the cannula body 101 is inserted into the left atrium. The head tubular joint 103 is provided with a flow guide cone 110 coaxially arranged in the head tubular joint 103. The large end of the flow guide cone 110 is connected with the above-mentioned circular blunt head, and the tip, i.e. the small end, is arranged towards the blood carrying hose 102. The outer wall of the head tubular joint 103 is uniformly provided with a plurality of blood inlet ports 105, such as three, along the circumference. The blood flow introduced by the blood inlet port 105 first contacts the outer wall of the flow guide cone 110, and then flows to the blood carrying hose 102 under the guidance of the tip of the flow guide cone 110. In order to improve the flow guiding effect and avoid the inhaled blood impacting the side wall of the flow guide cone 110, the side wall of the flow guide cone 110 can be arranged in a circular arc shape, i.e. the side wall of the flow guide cone 110 gradually changes from the large end to the small end of the flow guide cone 110 in a circular arc shape. The blood flow can be guided while buffering the blood flow rate, thereby reducing the discomfort of the patient's heart during ventricular assist pumping.

[0054] In this embodiment, the pressure detection device adopts a combination of a developing ring 111 and a pressure sensor 112. The developing ring 111 is sleeved on the outside of the guide head 104, and the pressure sensor 112 is arranged on the guide head 104.

[0055] The use principle of the above-mentioned ventricular assist pumping cannula 100 in this embodiment will be described in detail as follows:

[0056] In use, the tail tubular joint 106 of the ventricular assist pumping cannula 100 is connected with the external aorta of the heart and connected with the blood pumping power source, and the head tubular joint 103 is inserted into the left ventricle. When the pumping capacity of the patient's heart is insufficient, the blood in the left ventricle can be pumped into the blood carrying hose 102 through the blood inlet port 105 of the head tubular joint 103, and then into the external aorta of the heart through the blood outlet port 107 of the tail tubular joint 106, and then to the whole body. The guide head 104 of the cannula body 101 serves as the front end of the whole cannula, which cannot be pressed on the endocardium of the left ventricle during pumping. The position of the cannula body 101 in the heart and the abutting condition of the guide head 104 on the endocardium of the heart can be judged by the developing ring 111 and the pressure sensor 112. The present technical solution removes the original pig-tail flexible protrusion on the cannula, and uses the developing ring 111 and the pressure sensor 112 to replace the artificial experience. The pressure sensed by the cannula can be quantified, and the lateral and axial partial pressures of the cannula head can be displayed in real time and accurately, so as to avoid the adhesion of the blood inlet port to the inner wall of the heart during the pumping process. At the same time, the pig-tail flexible protrusion is removed from the head of the cannula in the present technical solution, which can avoid the formation of thrombus during the auxiliary pumping process.

[0057] Embodiment two

[0058] The embodiment provides a ventricular assist device 200, which comprises a blood pumping power source 201 and the ventricular assist pump blood cannula 100 disclosed in the first embodiment, and the blood pumping power source 201 is arranged in the second end of the tail tubular joint 106 of the ventricular assist pump blood cannula 100. The blood pumping power source is preferably a vane blood pump, which specifically comprises an impeller 202 and a motor 203. The impeller 202 is arranged in the tail tubular joint 106, and the impeller 202 comprises an impeller shaft 204 coaxially arranged with the tail tubular joint 106 and a plurality of blades 205 arranged on the outer periphery of the impeller shaft 204. The output end of the motor 203 is connected with the impeller shaft 204, and the second end of the tail tubular joint 106 and the impeller shaft 204 are both sealingly connected with the shell of the motor 203, so as to ensure the sealing property of the electrical components and prevent human tissue liquid (blood, water, etc.) from entering the electrical components, thereby accelerating corrosion and reducing the service life.

[0059] In the embodiment, as shown in Figure 6 and Figure 7 , the aforementioned impeller shaft 204 is preferably a conical impeller shaft, and the large end of the conical impeller shaft is arranged towards the motor 203, and the small end of the conical impeller shaft is arranged towards the blood walking hose 102. The front end of the impeller shaft 204 is small and sharp, and the rear end is large and thick, so as to be gradually dilated, which can ensure that the front end draws blood without damaging blood cells, and the rear end can draw blood with a large flow rate. As a preferred solution, the side wall of the impeller shaft 204 is circularly arc-shaped from the sharp end to the thick end.

[0060] Further, in the embodiment, as shown in Figure 7 , one end of each blade 205 close to the small end of the conical impeller shaft is spirally deflected. The blades 205 on the outer periphery of the impeller shaft 204 are uniformly distributed along the circumferential direction of the impeller shaft 204, and as a preferred solution, three blades 205 can be uniformly arranged along the circumferential direction of the impeller shaft 204.

[0061] In this embodiment, the motor 203 is a conventional motor, and its structure includes a motor shell, a motor coil, a magnet, a motor rotating shaft, a printed circuit board (PCB), a circuit board support, a bearing, and the like. The large end of the impeller shaft 204 is connected to the motor rotating shaft. The motor shell is preferably a cylindrical shell, and its one axial end can be connected to the tail end of the tail tubular joint 106 through a shell top connector. In order to achieve sealing, a sealing ring can be arranged between the shell top connector and the tail tubular joint 106. The other axial end of the motor shell is connected to a power supply and a signal line in use, for controlling the opening and closing of the motor and controlling the insertion tube head to collect pressure information. As a preferred solution, the developing ring 111 and the pressure sensor 112 in the pressure detection device can adopt a wired control mode or a wireless control mode. When both the developing ring 111 and the pressure sensor 112 adopt the wired control mode, both of them are electrically connected to components such as a power supply and a controller through a signal line. As a preferred solution, the signal line connected to the developing ring 111 and the pressure sensor 112 is arranged to pass through the blood delivery hose 102 and can be fixed to the inner wall of the blood delivery hose 102 through a related wire harness fixing structure. Correspondingly, the inside of the impeller shaft 204 can also be hollowed out to form a wire passing space that is in communication with the blood delivery hose 102. The signal line connected to the developing ring 111 and the pressure sensor 112 passes through the inside of the blood delivery hose 102, the inside of the impeller shaft 204, and the inside of the motor shell in sequence, and finally passes out of the tail end of the motor shell. This design arranges the signal line, the power supply line, and the like in the ventricular assist device 200, which not only ensures the neatness of the overall device, but also facilitates the implantation of the ventricular assist device 200 into the body.

[0062] The use principle of the ventricular assist device 200 in this embodiment will be described below.

[0063] The tail tubular joint 106 is connected to the external aorta of the heart, and the blood in the left ventricle flows into the blood delivery hose 102 through the head tubular joint 103. When the blood pumping capacity of the patient's heart is insufficient, the motor 203 is started, the impeller 202 rotates, and the blood in the left ventricle enters through the blood inlet 105 of the head tubular joint 103, then flows through the blood delivery hose 102 and the blood outlet 107 of the tail tubular joint 106 into the external aorta of the heart, and then flows to the whole body. The guide head 104 of the insertion tube body 101 serves as the front end of the whole insertion tube and cannot press on the inner membrane of the left ventricle during blood pumping. The position of the insertion tube body 101 in the heart and the abutting condition of the guide head 104 to the inner membrane of the heart can be judged by the developing ring 111 and the pressure sensor 112. This technical solution removes the pig-tail-shaped flexible protrusion on the original insertion tube and replaces it with the developing ring 111 and the pressure sensor 112, which can quantify the pressure sensed by the insertion tube and accurately display the lateral and axial pressure of the head of the insertion tube in real time, thereby avoiding the adhesion of the blood inlet to the inner wall of the heart during blood pumping. At the same time, this technical solution removes the pig-tail-shaped flexible protrusion at the head of the insertion tube, which can avoid the formation of blood clots during auxiliary blood pumping.

[0064] It is apparent to a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and range of equivalency of the claims are embraced therein, and no claim element should be construed as limiting the scope of the claims to which it is directed.

[0065] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for a person skilled in the art, according to the idea of the present application, there will be changes in the specific implementation modes and application ranges. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A cannula for ventricular assist pumping, characterized in that, The application relates to a ventricular assist pump blood cannula, which comprises the following parts: a cannula body, a blood inlet arranged at the head of the cannula body, a blood outlet arranged at the tail of the cannula body, the head of the cannula body being used for inserting into a left ventricle of a heart, the tail of the cannula body being used for accessing an aorta outside the heart, the cannula body being used for connecting with a blood pumping power source so as to guide blood in the left ventricle of the heart into the aorta outside the heart; the cannula body comprises a blood passing hose, a head tubular joint and a tail tubular joint, a first end of the head tubular joint is communicated with the head of the blood passing hose, a second end of the head tubular joint is provided with a guide head, a blood inlet is arranged on the side wall of the head tubular joint between the first end and the second end of the head tubular joint; a first end of the tail tubular joint is communicated with the tail of the blood passing hose, a second end of the tail tubular joint is used for connecting the blood pumping power source, a blood outlet is arranged on the side wall of the tail tubular joint between the first end and the second end of the tail tubular joint; the blood passing hose is bent at a position 1 / 3 of the length of the blood passing hose from the head, so that the head of the blood passing hose is arranged at an angle of 35-55 degrees with the tail of the blood passing hose, thereby simulating the shape of a blood vessel connected to the heart; the guide head is a round blunt head, a flow guide cone is arranged in the head tubular joint, the flow guide cone is connected with the round blunt head, and the tip of the flow guide cone is arranged towards the blood passing hose; the side wall of the flow guide cone is gradually changed from the big end of the flow guide cone to the small end of the flow guide cone in the form of an outward convex arc. A pressure detecting device is arranged on the guide head of the head of the cannula body and is located on the side of the blood inlet away from the tail of the cannula body, the pressure detecting device is used for detecting the pressure borne by the head of the cannula body, and can display the lateral partial pressure and the axial partial pressure of the head of the cannula body in real time and accurately, thereby avoiding the adhesion between the blood inlet and the inner wall of the heart during the blood pumping process; the head of the cannula body is provided without a pig-tail flexible protrusion, thereby avoiding the formation of thrombus during the auxiliary blood pumping process. The blood passing hose comprises an elastic hose and a hose skeleton, the hose skeleton is embedded in the tube wall of the elastic hose; wherein the hose skeleton comprises a plurality of metal rings arranged at intervals along the axial direction of the elastic hose, or the hose skeleton is formed by spirally winding a metal sheet.

2. The cannula for ventricular assist pumping according to claim 1, characterized in that The pressure detecting device comprises a developing ring and a pressure sensor, the developing ring is sleeved on the guide head, and the pressure sensor is arranged on the guide head.

3. The cannula for ventricular assist pump blood use according to claim 1 or 2, characterized in that, The application further relates to a blood pumping power source and the ventricular assist pump blood cannula, the blood pumping power source is arranged at the second end of the tail tubular joint.

4. A ventricular assist device, characterized by The blood pumping power source comprises:

5. The ventricular assist device of claim 4, wherein, an impeller, the impeller is arranged in the tail tubular joint, the impeller comprises an impeller shaft arranged coaxially with the tail tubular joint and a plurality of blades arranged on the outer periphery of the impeller shaft; a motor, the output end of the motor is connected with the impeller shaft, and the second end of the tail tubular joint and the impeller shaft are both sealingly connected with the shell of the motor. The impeller shaft is a conical impeller shaft, the big end of the conical impeller shaft is arranged towards the motor, and the small end of the conical impeller shaft is arranged towards the blood passing hose.

6. The ventricular assist device of claim 5, wherein, ​ 7. The ventricular assist device of claim 6, wherein, Each of the vanes is helically deflected at an end proximate to the small end of the conical impeller shaft, and the vanes are uniformly distributed along the circumference of the impeller shaft.

Images