Blood pump perfusion device and blood pump system with same

Abstract

The utility model relates to the technical field of blood pump systems, in particular to a blood pump perfusion device and a blood pump system with the same. The blood pump perfusion device comprises a cannula body, an outlet end of which is communicated with a perfusion pipeline; the perfusion push rod is slidably mounted in an inner cavity of the sleeve body, a limiting ring groove is circumferentially formed in the end, facing the inner side of the sleeve body, of the perfusion push rod, an elastic sealing ring is mounted in the limiting ring groove in an embedded mode, and the elastic sealing ring is in interference fit with the sleeve body. When the filling push rod moves repeatedly, due to the limiting effect of the limiting ring groove, the elastic sealing ring can be limited in the limiting ring groove, and the elastic sealing ring is prevented from falling off. In addition, during repeated friction, even if the elastic sealing ring is abraded, under the elastic action of the elastic sealing ring, interference fit between the elastic sealing ring and the sleeve body can still be achieved, the sealing performance between the sleeve body and the perfusion push rod can be greatly improved when the blood pump perfusion device is used for a long time, and the liquid leakage phenomenon of the sleeve body is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of blood pump systems, in particular to a blood pump perfusion device and a blood pump system having the same. Background Art

[0002] The blood pump device is a small pump used to replace the work of the heart and is an important part of the extracorporeal circulation device of the blood pump system. The extracorporeal circulation of the blood pump system is mainly composed of a blood pump, a drive device, a monitoring system and an energy source. The drive device usually uses a motor to drive the impeller to rotate to generate power to drive the blood from the ventricle to the artery. When the blood pump system is running, the motor will generate high temperature and blood may coagulate at the bearings when flowing through the motor, causing the motor to fail to operate normally. Therefore, when the motor is running, it is usually necessary to use a perfusion device to flush the motor so that the motor can continue to operate in an adapted temperature environment.

[0003] In the prior art, the design of the perfusion part in the blood pump is similar to the structure of a medical syringe, and the seal between the push rod and the perfusion sleeve is achieved by clamping and installing the rubber plug at the end of the push rod through a slot structure, and making the rubber plug and the inner cavity of the perfusion sleeve have an interference fit. However, the blood pump system usually runs continuously for several days to several months after startup. During the continuous operation of the blood pump system, the rubber plug often wears out severely or falls off due to repeated friction with the perfusion sleeve, causing leakage of the perfusion sleeve, making the blood pump unable to continue to be used. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the blood pump device in the prior art that the perfusion sleeve part will leak during long-term operation, thereby providing a blood pump perfusion device and a blood pump system having the same.

[0005] In order to solve the above technical problems, the utility model provides a blood pump perfusion device, comprising:

[0006] The casing body has an outlet end connected to a perfusion pipeline;

[0007] The injection push rod is slidably installed in the inner cavity of the sleeve body. A limiting ring groove is circumferentially arranged on one end of the injection push rod facing the inner side of the sleeve body. An elastic sealing ring is embedded in the limiting ring groove, and the elastic sealing ring is interference-fitted with the sleeve body.

[0008] Optionally, a plurality of limiting ring grooves are arranged at intervals, and an elastic sealing ring is installed in at least one of two adjacent limiting ring grooves.

[0009] Optionally, the perfusion pipeline includes a perfusion inlet pipe and a perfusion outlet pipe, and a pressure sensing component is installed on the perfusion outlet pipe.

[0010] Optionally, the pressure sensing element includes a sensing membrane and a pressure plate which are sealed and connected, a flow cavity is reserved between the sensing membrane and the pressure plate, and an inlet and an outlet of the flow cavity are both connected to the perfusion outlet pipe.

[0011] Optionally, the cross-sectional area of ​​the inlet of the flow chamber and the cross-sectional area of ​​the outlet of the flow chamber are both smaller than the cross-sectional area of ​​the perfusion inlet tube.

[0012] Optionally, both the outlet end of the perfusion inflow tube and the inlet end of the perfusion outflow tube are equipped with a one-way valve.

[0013] Optionally, a two-way check valve is installed at the outlet end of the sleeve body, and the perfusion inflow pipe and the perfusion outflow pipe are respectively installed at both ends of the two-way check valve.

[0014] The utility model also provides a blood pump system, which comprises the blood pump perfusion device of the utility model.

[0015] Optionally, a motor is further included, with a driving gear installed at the output end of the motor, the driving gear is meshed with the perfusion push rod, and the motor is suitable for driving the driving gear to rotate, thereby driving the perfusion push rod to reciprocate.

[0016] The technical solution of the utility model has the following advantages:

[0017] 1. The blood pump perfusion device provided by the utility model comprises: a cannula body, the outlet end of which is connected to a perfusion pipeline; a perfusion push rod, which is slidably installed in the inner cavity of the cannula body, and a limit ring groove is arranged circumferentially on the inner side end of the cannula body, and an elastic sealing ring is embedded and installed in the limit ring groove, and the elastic sealing ring is interference fit with the cannula body.

[0018] By providing a limiting ring groove at the end of the perfusion push rod, installing an elastic sealing ring in the limiting ring groove, and utilizing the interference fit between the elastic sealing ring and the sleeve body, a sealing fit between the perfusion push rod and the sleeve body is achieved. When the perfusion push rod moves repeatedly, due to the limiting effect of the limiting ring groove, the elastic sealing ring can be limited in the limiting ring groove to prevent the elastic sealing ring from falling off. Moreover, during repeated friction, even if the elastic sealing ring is worn, under the elastic effect of the elastic sealing ring itself, an interference fit between the elastic sealing ring and the sleeve body can still be achieved, which can greatly improve the sealing performance between the sleeve body and the perfusion push rod when the blood pump perfusion device is used for a long time, and prevent the sleeve body from leaking.

[0019] 2. The blood pump perfusion device provided by the utility model has a plurality of spaced-apart limiting ring grooves, and an elastic sealing ring is installed in at least one of two adjacent limiting ring grooves. When the elastic sealing ring near the end is damaged and leaks locally, the leaked liquid can be temporarily stored in the spaced-apart limiting ring groove without the elastic sealing ring, and blocked by the elastic sealing ring of the next layer, thus achieving multi-layer sealing and improving the sealing performance between the sleeve body and the perfusion push rod when the blood pump perfusion device is used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic structural diagram of a blood pump perfusion device provided in an embodiment of the utility model.

[0022] Figure 2 It is a schematic structural diagram of the sleeve body and the injection push rod provided in the embodiment of the utility model.

[0023] Figure 3 It is a schematic structural diagram of a two-way check valve provided in an embodiment of the utility model.

[0024] Figure 4 It is a cross-sectional view of a pressure sensing element provided in an embodiment of the present utility model.

[0025] Figure 5 It is a schematic structural diagram of a pressure plate provided in an embodiment of the present utility model.

[0026] Figure 6 This is a schematic structural diagram of a blood pump perfusion device provided in another embodiment of the present invention.

[0027] Figure 7 It is a schematic structural diagram of a blood pump system provided in an embodiment of the present utility model.

[0028] Explanation of the reference numerals: 1. sleeve body; 2. injection push rod; 3. limit ring groove; 4. elastic sealing ring; 5. injection inflow pipe; 6. injection outflow pipe; 7. sensing membrane; 8. pressure plate; 9. flow chamber; 10. two-way check valve; 11. one-way valve; 12. motor; 13. exhaust hole. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] like Figures 1 to 5 As shown, a blood pump perfusion device is provided for this embodiment, comprising a cannula body 1 and a perfusion push rod 2, wherein the outlet end of the cannula body 1 is connected to a perfusion pipeline.

[0035] The injection push rod 2 is slidably installed in the inner cavity of the sleeve body 1. A limiting ring groove 3 is provided in the circumferential direction of one end of the injection push rod 2 facing the inner side of the sleeve body 1. An O-type rubber ring as an elastic sealing ring 4 is embedded and installed in the limiting ring groove 3. The elastic sealing ring 4 is interference fit with the sleeve body 1. By providing the limiting ring groove 3 at the end of the injection push rod 2 and installing the elastic sealing ring 4 in the limiting ring groove 3, the sealing fit between the injection push rod 2 and the sleeve body 1 is achieved by utilizing the interference fit between the elastic sealing ring 4 and the sleeve body 1. When the injection push rod 2 moves repeatedly, due to the limiting effect of the limiting ring groove 3, the elastic sealing ring 4 can be limited in the limiting ring groove 3 to prevent the elastic sealing ring 4 from falling off. Moreover, during repeated friction, even if the elastic sealing ring 4 is worn, the elastic sealing ring 4 can still achieve an interference fit with the sleeve body 1 due to its own elastic action, which can greatly improve the sealing performance between the sleeve body 1 and the perfusion push rod 2 when the blood pump perfusion device is used for a long time, and prevent the sleeve body 1 from leaking.

[0036] There are multiple spaced apart limiting ring grooves 3, and at least one of the two adjacent limiting ring grooves 3 is installed with an elastic sealing ring 4. Specifically, there are three spaced apart limiting ring grooves 3, wherein the front and rear limiting ring grooves 3 are installed with elastic sealing rings 4, and the middle limiting ring groove 3 is not provided with an elastic sealing ring 4. When the elastic sealing ring 4 near the end is damaged and leaks locally, the leaked liquid can be temporarily stored in the limiting ring groove 3 without the elastic sealing ring 4, and is blocked by the elastic sealing ring 4 of the next layer, thereby achieving multi-layer sealing and improving the sealing performance between the sleeve body 1 and the perfusion push rod 2 when the blood pump perfusion device is used for a long time.

[0037] The perfusion pipeline includes a perfusion inlet pipe 5 and a perfusion outlet pipe 6, and a pressure sensing component is installed on the perfusion outlet pipe 6. The pressure sensing component includes a sealed sensing membrane 7 and a pressure plate 8, and a flow cavity 9 is reserved between the sensing membrane 7 and the pressure plate 8. The inlet and outlet of the flow cavity 9 are both connected to the perfusion outlet pipe 6. The sensing membrane 7 and the pressure plate 8 are sealed by adhesive. In order to achieve a better sealing effect, an exhaust hole 13 is added to the pressure plate 8. In the process of connecting the sensing membrane 7 and the pressure plate 8 by filling with glue, the air in the flow cavity 9 is exhausted through the exhaust hole 13, and then the exhaust hole 13 is sealed.

[0038] The cross-sectional area of ​​the inlet of the flow chamber 9 and the cross-sectional area of ​​the outlet of the flow chamber 9 are both smaller than the cross-sectional area of ​​the perfusion outlet pipe 6. A two-way check valve 10 is installed at the outlet end of the sleeve body 1, and the perfusion inlet pipe 5 and the perfusion outlet pipe 6 are installed at both ends of the two-way check valve 10 respectively. By using the two-way check valve 10 to unidirectionally conduct the perfusion inlet pipe 5 and the perfusion outlet pipe 6, the overall structure of the device is simplified, the assembly process is reduced, and the production cost is reduced.

[0039] As an alternative implementation, Figure 6 As shown, a one-way valve 11 is installed on the outlet end of the perfusion inflow pipe 5 and the inlet end of the perfusion outflow pipe 6 respectively.

[0040] When the blood pump perfusion device is working, the inlet end of the perfusion inlet tube 5 is connected to the hanging bag filled with physiological saline through the needle, and the outlet end of the perfusion outlet tube 6 is connected to the driving device of the blood pump system, so as to use the physiological saline to flush, clean and cool down the bearings of the driving motor; the physiological saline enters the inner cavity of the sleeve body 1 through the perfusion inlet tube 5, and at the same time, the perfusion push rod 2 moves toward the outlet end away from the sleeve body 1, and at this time, the inner cavity of the sleeve body 1 is filled with physiological saline; when the perfusion push rod 2 is driven by external force to move toward the outlet end of the sleeve body 1, the physiological saline in the inner cavity of the sleeve body 1 is pushed into the perfusion outlet tube 6, and then enters the driving device of the blood pump system.

[0041] Example 2

[0042] Figure 7 The blood pump system provided in this embodiment is shown, which has the blood pump perfusion device described in Embodiment 1. It also includes a motor 12, and a driving gear is installed at the output end of the motor 12. The driving gear meshes with the perfusion push rod 2, and the motor 12 is suitable for driving the driving gear to rotate. The motor 12 drives the perfusion push rod 2 to achieve reciprocating linear motion of the perfusion push rod 2, thereby achieving the suction and discharge of liquid; when the liquid passes through the flow cavity 9 of the pressure sensing component, the sensing membrane 7 senses the fluid pressure in the flow cavity 9 and deforms, and the pressure sensor installed on the sensing membrane 7 converts the deformation of the sensing membrane 7 into a pressure signal for transmission.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A blood pump perfusion device, characterized in that: include: A casing body (1), the outlet end of which is connected to a perfusion pipeline; The injection push rod (2) is slidably installed in the inner cavity of the sleeve body (1), and a limiting ring groove (3) is arranged circumferentially on one end of the injection push rod (2) facing the inner side of the sleeve body (1). An elastic sealing ring (4) is embedded in the limiting ring groove (3), and the elastic sealing ring (4) is interference fit with the sleeve body (1).

2. The blood pump perfusion device according to claim 1, characterized in that: A plurality of the limiting ring grooves (3) are arranged at intervals, and the elastic sealing ring (4) is installed in at least one of the two adjacent limiting ring grooves (3).

3. The blood pump perfusion device according to claim 1 or 2, characterized in that: The perfusion pipeline comprises a perfusion inflow pipe (5) and a perfusion outflow pipe (6), and a pressure sensing component is installed on the perfusion outflow pipe (6).

4. The blood pump perfusion device according to claim 3, characterized in that: The pressure sensing element comprises a sensing membrane (7) and a pressure plate (8) which are sealed and connected. A flow cavity (9) is reserved between the sensing membrane (7) and the pressure plate (8). The inlet and outlet of the flow cavity (9) are both connected to the perfusion outlet pipe (6).

5. The blood pump perfusion device according to claim 4, characterized in that: The cross-sectional area of ​​the inlet of the flow chamber (9) and the cross-sectional area of ​​the outlet of the flow chamber (9) are both smaller than the cross-sectional area of ​​the perfusion outlet pipe (6).

6. The blood pump perfusion device according to claim 3, characterized in that: The outlet end of the perfusion inflow pipe (5) and the inlet end of the perfusion outflow pipe (6) are both installed with a one-way valve (11).

7. The blood pump perfusion device according to claim 3, characterized in that: A two-way check valve (10) is installed at the outlet end of the sleeve body (1), and the perfusion inflow pipe (5) and the perfusion outflow pipe (6) are respectively installed at both ends of the two-way check valve (10).

8. A blood pump system, characterized in that: A blood pump perfusion device according to any one of claims 1 to 7.

9. The blood pump system according to claim 8, characterized in that: It also includes a motor (12), the output end of which is equipped with a driving gear, the driving gear meshing with the perfusion push rod (2), and the motor (12) is suitable for driving the driving gear to rotate, thereby driving the perfusion push rod (2) to reciprocate.

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