CN114796848A

CN114796848A - Linear driving structure, flushing device and ventricular assist system

Info

Publication number: CN114796848A
Application number: CN202210413766.7A
Authority: CN
Inventors: 乔印云; 刘欢; 王子强; 陈凯
Original assignee: Anhui Tongling Bionic Technology Co Ltd
Current assignee: Anhui Tongling Bionic Technology Co Ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-29

Abstract

The application provides a linear driving structure, a flushing device and a ventricular assist system, wherein the driving structure comprises a wheel shaft, a plurality of eccentric wheels and a peristaltic sliding plate; the eccentric wheels are sequentially arranged on the wheel shaft in a transmission way along the axial direction, and each eccentric wheel sequentially deflects towards the same wheel shaft by the same angle in the circumferential direction from the head end to the tail end; each eccentric wheel is sleeved with a peristaltic sliding plate, the peristaltic sliding plates reciprocate along the radial direction of the wheel shaft along with the rotation of the eccentric wheel, and the reciprocating directions of all the peristaltic sliding plates are parallel to each other; the end part of the peristaltic sliding plate along the moving direction is a squeezing part which is configured to squeeze the hose; the outer contour surface of the extrusion part is a conical cambered surface protruding outwards. The application provides a linear drive structure, washing unit and ventricle auxiliary system will be used for the extrusion portion design of extrusion hose to be conical arc, can effectively reduce the mechanical damage that leads to the fact the hose at long-time high frequency extrusion hose's in-process, helps prolonging the life of hose.

Description

Linear driving structure, flushing device and ventricular assist system

Technical Field

The application relates to the technical field of medical equipment, in particular to a linear driving structure, a flushing device and a ventricular assist system.

Background

The ventricular assist system is a novel mechanical circulation support system for a patient with end-stage heart failure, and is mainly used for assisting blood in a left ventricle to flow out of an aorta through a ventricular assist device, so that the work of the left ventricle is reduced, the heart is effectively rested, and the function is recovered.

Ventricular assist systems typically include a control system, an irrigation system, and a pumping system, among others. The flushing system flushes and lubricates a pumping motor in the pumping system continuously by driving flushing liquid to flow, and provides proper pressure to achieve the effect of preventing blood in a human body from entering the pumping motor.

Disclosure of Invention

In view of the above, it is an object of the present application to propose a linear drive configuration, an irrigation device and a ventricular assist system that overcome or at least partially solve the above-mentioned problems.

In view of the above object, the present application provides a linear driving structure including: the wheel shaft, a plurality of eccentric wheels and the peristaltic sliding plate; the eccentric wheels are sequentially arranged on the wheel shaft in a transmission manner along the axial direction, and each eccentric wheel sequentially deflects towards the same wheel shaft in the circumferential direction by the same angle from the head end to the tail end; each eccentric wheel is sleeved with one peristaltic sliding plate, the peristaltic sliding plates reciprocate along the radial direction of the wheel shaft along with the rotation of the eccentric wheel, and the reciprocating directions of all the peristaltic sliding plates are parallel to each other; the end part of the peristaltic sliding plate along the moving direction is a pressing part which is configured to press a hose; the outer contour surface of the extrusion part is a conical cambered surface protruding outwards.

Further, the curve fullness value Rho of the conical cambered surface is greater than or equal to 0.8.

Further, the offset angle of adjacent eccentrics is 20 ° to 40 °.

Further, each creep sliding plate is provided with a supporting protrusion with a convex surface, and two adjacent creep sliding plates are abutted through the respective supporting protrusions.

Based on the same inventive concept, the present application further provides a flushing device, comprising: the linear driving structure comprises a shell, a driving cavity and a driving mechanism, wherein the driving cavity is arranged in the shell, and the linear driving structure is installed in the driving cavity; at least one end of the wheel shaft extends out of the driving cavity and is used for being in transmission connection with the power motor; the upper cover is detachably arranged at the top of the shell, an action cavity is formed between the upper cover and the shell, and a hose for guiding flushing liquid is arranged in the action cavity in a penetrating manner; the driving cavity is provided with an opening communicated with the action cavity, the extrusion part extends into the action cavity through the opening, and the hose is extruded periodically; the buffer plate is arranged in the action cavity, the bottom of the buffer plate is in contact with the hose, and the top of the buffer plate is arranged on the upper cover.

Further, the height of the gap between the top end of the pressing portion and the bottom of the cushion plate in a free state is equal to twice the wall thickness of the hose.

Furthermore, a plurality of buffer springs are installed between the buffer plate and the upper cover, and the plurality of buffer springs are distributed at intervals corresponding to the axis of the hose.

Further, the buffer spring is a pressure spring, and the shear modulus of the buffer spring is 70000-.

Furthermore, a plurality of guide protrusions are arranged on the side wall, close to the opening, of the driving cavity at intervals along the axial direction of the wheel shaft, and the peristaltic sliding plate is installed between every two adjacent guide protrusions.

Based on the same inventive concept, the present application further provides a ventricular assist system, comprising: the flushing device, the pumping system, the control system and the catheter; the pumping system comprises a pumping motor, a steel wire pipe and an impeller which is in transmission connection with an output shaft of the pumping motor and is arranged in the steel wire pipe; the control system comprises a pressure sensor and a controller electrically connected with the power motor; the liquid outlet end of the hose is connected with the liquid inlet side of a pumping motor in the pumping system through the inner cavity of the guide pipe, a liquid outlet configured to discharge flushing liquid in the pumping system is formed in the steel wire pipe, and the liquid outlet is positioned between the pumping motor and the impeller; the pressure sensor is arranged at the liquid outlet section of the hose so as to detect the pressure of flushing liquid output by the flushing device; the controller controls an output rotation speed of the power motor according to the flushing liquid pressure to maintain the flushing liquid pressure at 300 to 1500 mmHg.

From the foregoing, the linear driving structure, the flushing device and the ventricular assist system provided by the application have the advantages that the extruding part for extruding the hose is designed into the conical arc shape, so that the mechanical damage to the hose can be effectively reduced in the process of extruding the hose at a high frequency for a long time, and the service life of the hose can be prolonged. Simultaneously, the conical arc shape's extrusion portion can also reduce and the hose between area of contact, increase heat dissipation space, avoids the hose to absorb the heat at the in-process that the pressurized deformation warp, and then avoids inside flowing flush fluid temperature rise to cause harmful effects to human blood. In addition, in the process that the peristalsis slide plate acts on the hose, the conical arc-shaped extrusion part can also effectively reduce the variable quantity of the inner volume of the hose, so that the phenomena of flow breaking and suck back of flushing liquid cannot occur in the conveying process.

When the extrusion force of the peristaltic sliding plate on the hose is larger than the force required by the compression hose, the excessive force can be transmitted to the buffer plate, and the buffer plate deforms or moves to protect the hose and prolong the service life of the hose.

Because the washing liquid pulsation that the washing device of this application output is less, consequently can shorten control system's among the ventricle auxiliary system adjust time, reduce the regulation number of times, reduce control system's operating pressure, prolong its life.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a linear driving structure according to an embodiment of the present application;

FIG. 2 is a schematic view of an axle and eccentric of the linear drive configuration of the present application;

FIG. 3 is a schematic view of an eccentric of the linear drive configuration of the present application;

FIG. 4 is an axial schematic view of an axle and eccentric of the linear drive configuration of the present application;

FIG. 5 is a schematic view of the extrusion of the linear drive configuration of the present application and a proportional extrusion hose;

FIG. 6 is a schematic view of a flushing device according to an embodiment of the present application;

FIG. 7 is an exploded view of a flushing device according to an embodiment of the present application;

FIG. 8 is a cross-sectional view of an irrigation device according to an embodiment of the present application;

FIG. 9 is a schematic view of a housing of a flushing device according to an embodiment of the present application;

FIG. 10 is a schematic view of a ventricular assist system in accordance with an embodiment of the present application;

fig. 11 is a schematic diagram of a control mode between a control system of the ventricular assist system and the flushing device according to an embodiment of the present application.

Description of reference numerals:

1. a linear drive structure; 11. a wheel axle; 111. a key; 112. a coupling;

12. eccentric wheel, 121, axle hole; 122. a groove;

13. a peristaltic slide; 131. a pressing section; 132. a support boss;

2. a flushing device; 21. a hose;

22. a housing; 221. a drive chamber; 222. an opening; 223. a guide projection; 224. a first housing half; 225. a second half-shell;

23. an upper cover; 231. a limiting guide post; 24. an action cavity; 25. a buffer plate; 26. a buffer spring; 27. a retainer ring; 28. a shaft sleeve; 29. a bevel gear;

3. a pumping system; 31. a pumping motor; 32. a steel wire pipe; 321. an impeller mounting section; 322. a liquid outlet;

4. a control system; 41. a pressure sensor; 42. a controller;

5. a conduit; 6. a power motor; 7. a filter; 8. a wire collecting box; 9. a pressurized liquid tube.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.

It should be noted that: the relative arrangement of the components, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the related art, a peristaltic pump is generally used to drive the flow of the flushing liquid. The peristaltic pump comprises a disc-shaped roller frame, and two to four rollers are arranged around the axis of the roller frame. The motor drives the roller carrier to rotate, and the rotary roller carrier drives the roller to periodically extrude the flushing hose so as to drive flushing liquid in the flushing hose to flow. During the process that the roller contacts and presses the flushing hose to leave, the roller not only has radial pressing action on the flushing hose, but also rolls along the axial direction of the flushing hose (or extending direction of the flushing hose). During the rolling of the roller along the flushing hose, a certain amount of heat must be generated, which heat will cause the temperature of the flushing liquid inside the flushing hose to rise. Although the temperature rise is small, the temperature of the blood is sensitive because the rinse solution is in direct contact with the blood at the pumping motor, and the blood may be adversely affected by the warmed rinse solution.

In view of this, as shown in fig. 1 and fig. 2, the present embodiment provides a linear driving structure 1, including: a wheel shaft 11, a plurality of eccentric wheels 12 and a peristaltic slider 13; the eccentric wheels 12 are sequentially arranged on the wheel shaft 11 in a transmission way along the axial direction, and each eccentric wheel 12 deflects by the same angle relative to the previous adjacent eccentric wheel 12 along the circumferential direction of the same wheel shaft 11 from the head end to the tail end; each eccentric wheel 12 is sleeved with a creeping sliding plate 13, the creeping sliding plates 13 reciprocate along the radial direction of the wheel shaft 11 along with the rotation of the eccentric wheels 12, and the reciprocating directions of all the creeping sliding plates 13 are parallel to each other; the end of the peristaltic slide 13 in the moving direction is a pressing part 131, and the pressing part 131 is configured to press the hose 21; the outer contour surface of the pressing portion 131 is a conical arc surface protruding outward.

As shown in fig. 2 and 3, the axle 11 is optionally provided with a key 111 extending in the axial direction thereof, and each eccentric 12 is provided with an axle hole 121 penetrating therethrough and matching the axle 11, and a groove 122 communicating with the axle hole 121 and matching the key 111. The eccentric wheel 12 is inserted into the wheel shaft 11 with the key 111 through the shaft hole 121 and the groove 122, and the wheel shaft 11 is in transmission connection with the eccentric wheel 12 through the key 111.

Optionally, the eccentric 12 and the axle 11 are fixed by gluing.

Optionally, two adjacent eccentric wheels 12 are fixed by gluing.

In order to reduce friction generated by the pressing portion 131 in the process of pressing the hose 21 and avoid heat absorption and temperature rise of the hose 21, it is necessary to reduce the contact area between the pressing portion 131 and the hose 21 as much as possible, so that friction generated between the pressing portion 131 and the hose 21 can be reduced, and a large heat dissipation space can be provided between the pressing portion and the hose.

As can be seen from fig. 5, if the pressing portion 131 is formed in a pointed shape (left side example in the figure), although the contact area with the hose 21 is small in the process of pressing the hose 21, the hose 21 is easily damaged by the pressing of the hose 21 for a long time and at a high frequency, and the service life of the hose 21 is reduced. If the pressing portion 131 is formed in an arc shape (in the example shown on the right side in the figure), although the hose 21 can be protected during the process of pressing the hose 21, the contact area between the two is large, and the heat dissipation space is small. In the linear driving structure 1 of this embodiment, the pressing portion 131 is a conical arc shape, and is between the acute angle shape and the circular arc shape, so that it can be ensured that the pressing portion 131 can keep a smaller contact area with the hose 21 when pressing the hose 21, a larger heat dissipation space is reserved, and the hose 21 can be prevented from being damaged by the acute angle structure.

In addition, in the linear drive structure 1 of the present embodiment, since the contact area of the pressing portion 131 with the hose 21 is small when pressing the hose 21, the amount of change in the tube volume on both sides of the cut-off portion of the hose 21 (i.e., the portion where the hose 21 is pressed, where the inner wall of the hose 21 is pressed and adhered and the rinse liquid cannot flow) is also small. Accordingly, at the moment when the squeezing portion 131 starts to leave the hose 21, the instantaneous variation of the flow rate of the rinse liquid in the hose 21 is small, which helps to reduce pulsation of the rinse liquid and prevent the occurrence of flow interruption and suck-back.

In the case of the linear driving structure 1 of the present embodiment, the wheel shaft 11 drives all the eccentric wheels 12 to rotate, each eccentric wheel 12 pushes the creep slide 13 engaged therewith to linearly reciprocate during the rotation, and the pressing portion 131 of all the creep slides 13 as a whole has a serpentine shape (or wave shape, i.e. the movement of each creep slide 13 is slightly delayed with respect to the previous creep slide 13 and slightly advanced with respect to the next creep slide 13) to radially press the hose 21, so that a closed region from upstream to downstream is formed on the hose 21 without interruption. When the pressing portion 131 of the peristaltic slider 13 at the rear end starts to move away from the hose 21, the washing liquid in the closed area starts to be discharged outward.

In the linear driving structure 1 of the present embodiment, the pressing portion 131 for pressing the flexible tube 21 is designed to be in the shape of a conical arc, so that the mechanical damage to the flexible tube 21 can be effectively reduced in the process of pressing the flexible tube 21 for a long time at a high frequency, which is helpful for prolonging the service life of the flexible tube 21. Meanwhile, the conical arc-shaped squeezing portion 131 can also reduce the contact area between the flexible pipe 21 and the conical arc-shaped squeezing portion, so that the heat dissipation space is increased, the flexible pipe 21 is prevented from absorbing heat in the compression deformation process, and the adverse effect on the blood of a human body caused by the temperature rise of flushing liquid flowing inside the flexible pipe is further avoided. In addition, in the process that the peristaltic sliding plate 13 acts on the hose 21, the conical arc-shaped pressing part 131 can effectively reduce the variation of the inner volume of the hose 21, so that the phenomena of flow breaking and suck back of the flushing liquid cannot occur in the conveying process.

In some embodiments, the curve saturation value Rho of the conical surface is greater than or equal to 0.8.

The curve fullness value is a value between 0 and 1, and a smaller value indicates that the conic section is flatter, and a larger value indicates that the conic section is fuller. When the value is less than 0.5, the line shape is approximate to an ellipse; when the numerical value is 0.5, the linear form is parabolic; when the value is larger than 0.5, the line shape approximates to a hyperbolic curve.

In some embodiments, the deflection angle of adjacent eccentrics 12 is 20 ° to 40 °, and the product of the deflection angle and the number of peristaltic slides 13 is the circumferential angle. As shown in fig. 4, the deflection angle is an angle a in the figure.

Optionally, the angle of angle a is 20 °, 24 °, 30 °, 36 ° or 40 °.

Correspondingly, when the angle a is 20 °, the number of the eccentrics 12 mounted on the axle 11 is 18. When the angle a is 24 °, the number of eccentrics 12 mounted on the axle 11 is 15. When the angle of the angle a is 30 °, the number of the eccentric wheels 12 mounted on the wheel shaft 11 is 12. When the angle of the angle a is 36 °, the number of the eccentric wheels 12 mounted on the wheel shaft 11 is 10. When the angle of the angle a is 40 °, the number of the eccentrics 12 mounted on the axle 11 is 8.

Because the corresponding relationship exists between the deflection angle and the peristaltic sliding plates 13, if the deflection angle is too small, the number of the peristaltic sliding plates 13 is large, which may cause the overall size of the linear driving structure 1 to be too large, and the application range to be small; another possibility is to make the peristaltic slides 13 thin, mechanically weak, with insufficient squeezing strength on the hose 21 and a short service life. If the deflection angle is too large, the number of peristaltic slides 13 will be small, increasing the gap between the peristaltic slides 13 and making it easier to pulse the flushing liquid in the hose 21.

As shown in fig. 1, in some embodiments, each peristaltic slide 13 is provided with a support projection 132 of convex surface, and two adjacent peristaltic slides 13 are abutted by respective support projections 132.

Optionally, two side walls of each creep slide 13 along the radial direction of the wheel axle 11 are respectively provided with a support protrusion 132, and the two support protrusions 132 are symmetrical with respect to the center line of the creep slide 13. Each of the support projections 132 projects from the side wall surface of the creep slide 13 in the axial direction of the wheel shaft 11. In other words, the adjacent two creep slides 13 are contacted only by the support protrusions 132, and a certain interval is kept between the plate surfaces of the creep slides 13.

In the linear driving structure 1 of this embodiment, through setting up the support protrusion 132 that the area is less, can effectual reduction two adjacent contact area between the wriggling slide 13, and then reduce the friction that both produced at reciprocating motion in-process, can prolong the life of wriggling slide 13 on the one hand, on the other hand also can reduce the heat that wriggling slide 13 produced at the removal in-process, further avoid the washing liquid in the hose 21 to absorb heat at transportation in-process.

Based on the same inventive concept, the present embodiment provides a flushing device 2 in combination with the description of the linear driving structure 1 of the above embodiments.

As shown in fig. 6, 7, 8, 9 and 10, the flushing device 2 comprises: a housing 22, inside which a driving cavity 221 is provided, the driving cavity 221 being internally provided with the linear driving structure 1 of any of the previous embodiments; at least one end of the wheel shaft 11 extends out of the driving cavity 221 for being in transmission connection with the power motor 6; the upper cover 23 is detachably arranged at the top of the shell 22, an action cavity 24 is formed between the upper cover 23 and the shell 22, and a hose 21 for guiding flushing liquid is arranged in the action cavity 24 in a penetrating manner; the driving cavity 221 is provided with an opening 222 communicated with the action cavity 24, the extrusion part 131 extends into the action cavity 24 through the opening 222, and the hose 21 is extruded periodically; and a buffer plate 25 disposed in the action chamber 24, wherein the bottom of the buffer plate 25 is in contact with the hose 21, and the top thereof is mounted on the upper cover 23.

Optionally, the wheel shaft 11 is in transmission connection with the output shaft of the power motor 6 through a coupler. If the output shaft of the power motor 6 is perpendicular to the wheel shaft 11, a pair of bevel gears is additionally arranged to realize effective transmission connection between the wheel shaft 11 and the output shaft of the power motor 6.

Optionally, housing 22 is a first housing half 224 and a second housing half 225 split radially along hub 11.

Optionally, the wheel shaft 11 is rotatably mounted on the side wall of the housing 22 through a shaft sleeve 28 or a bearing, a retainer ring 27 is further mounted at each of two ends of the whole eccentric wheels 12, one side of the retainer ring 27 is in contact with the side wall of the driving cavity 221, and the other side of the retainer ring 27 is used for stopping the peristaltic slider 13, so as to ensure a one-to-one correspondence relationship between the peristaltic slider 13 and the eccentric wheels 12.

Optionally, the upper cover 23 is fixed to the housing 22 in a snap fit manner.

When the washing device 2 is used, the power motor 6 drives the wheel shaft 11 to rotate, and the plurality of eccentric wheels 12 rotating along with the wheel shaft 11 respectively drive the corresponding peristaltic sliding plates 13 to reciprocate up and down. The pressing portion 131 of all the peristaltic sliders 13 has a serpentine shape and radially presses the flexible tube 21, so that a closed area is continuously formed on the flexible tube 21 from the upstream to the downstream to drive the flow of the flushing liquid in the flexible tube 21.

When the extrusion force of the peristaltic sliding plate 13 on the hose 21 is larger than the force required for pressing the hose 21, the excessive force is transmitted to the buffer plate 25, and the buffer plate 25 deforms or moves to protect the hose 21 and prolong the service life of the hose.

In some embodiments, the height of the gap between the top end of the pressing portion 131 and the bottom of the free-state cushion plate 25 is equal to twice the wall thickness of the hose 21.

In order to avoid the influence of the buffer plate 25 on the normal squeezing action of the peristaltic slide 13 on the hose 21, the height of the buffer plate 25 is set such that the squeezing portion 131 of the peristaltic slide 13 in its free state can just press the hose 21 when normally moving to the highest point, and the buffer plate 25 is not driven to deform or move.

As shown in fig. 7 and 8, in some embodiments, a plurality of buffer springs 26 are installed between the buffer plate 25 and the upper cover 23, and the plurality of buffer springs 26 are spaced along the axis of the hose 21.

Optionally, the buffer spring 26 is a pressure spring, and the shear modulus G is 70000-.

Optionally, the shear modulus G of the damping spring 26 is 70000MPa, 71000MPa, 72000MPa, 73000MPa, 74000MPa, 75000MPa, 76000MPa, 77000MPa, 78000MPa, 79000MPa, or 80000 MPa.

In the case of a heart failure patient, the amount of the washing fluid introduced into the body through the aorta should not be too large, or adverse effects may occur, so that it is necessary to strictly control the amount of the introduced washing fluid while ensuring a certain pressure to prevent blood from entering the inside of the pumping motor 31.

In order to avoid backflow and accurate control of the flushing amount, the extrusion part 131 is required to ensure that the hose 21 is extruded in a saturated manner every time, and the linear driving structure is important to be matched with the size of the upper cover 23, but the linear driving structure is difficult to control accurately in practical operation, so that the hose 21 can be protected by compensating through the buffer spring 26, and the hose 21 is prevented from being damaged due to excessive extrusion; on the other hand, the buffer spring 26 provides a certain pretightening force to enable the buffer plate 25 to press the hose 21, so as to prevent the hose 21 from being displaced or impacted when being extruded, and the pretightening force provided by the buffer spring 26 is greater than or equal to the resilience force of the hose 21.

Meanwhile, the excessive pressure applied to the hose 21 can be prevented from being transmitted to the upper cover 23, so that the upper cover 23 is loosened from the shell 22 after being pressed intermittently frequently, and the stability of the flushing liquid output by the flushing device 2 of the embodiment is affected.

Optionally, the hose 21 is made of a material with shore hardness of 50-60A, specifically, one of silica gel, PVC, PU, and TPU.

As shown in fig. 7, 8 and 9, in some embodiments, the side wall of the driving chamber 221 near the opening 222 is provided with a plurality of guide projections 223 at intervals along the axial direction of the hub 11, and the peristaltic slide 13 is installed between two adjacent guide projections 223.

The guide projection 223 can guide the peristaltic sliding plate 13 which moves back and forth, on one hand, the peristaltic sliding plate 13 can keep moving up and down, the squeezing portions 131 can be guaranteed to effectively squeeze the hose 21, on the other hand, a certain gap can be kept between every two adjacent peristaltic sliding plates 13, and collision interference among the squeezing portions 131 in the up-and-down moving process is also guaranteed.

As can be seen from the above, in the related art, a disc-type peristaltic pump is generally used for the operation of conveying the washing liquid. However, during the process of pressing the flushing hose by the rollers, a section of "liquid pillow" is formed in the inner cavity of the flushing hose 21 between two adjacent rollers, and the flow rate of the flushing liquid output by the peristaltic pump depends on the rotating speed of each roller and the volume of the "liquid pillow". When the volume of the 'liquid pillow' is larger, the pulse of the flushing liquid output by the peristaltic pump is correspondingly larger. Meanwhile, if the pipe diameter of the flushing hose is large and the rotating speed of the roller is low, the roller is easy to break off or even suck back when the roller loosens the flushing hose.

Typical applications may not be pulse sensitive, but in ventricular assist systems, the demand for pulsation may be relatively high and may not allow for flow interruption or suck back situations.

In order to solve the above problem, a control system 4 is provided in the ventricular assist system, the control system 4 detects the pressure of the flushing liquid at the output side of the peristaltic pump through a pressure sensor 41 and feeds the detection result back to a controller 42, and the controller 42 adjusts the rotation speed of the power motor 6 according to the comparison result between the detection result and the preset pressure value, so as to maintain the flushing liquid entering the pumping system 3 within the preset range, as shown in fig. 10 and 11.

Since the ventricular assist system uses a scenario with high pulsation requirements, even the peristaltic pump generates pulsations caused by high frequency small occipital flow, which trigger the regulation mechanism of the control system 4. In order to maintain the pressure fluctuations of the flushing liquid within a preset small range, the control system 4 needs to repeatedly adjust the rotational speed of the power motor 6 for a long time. In the process, repeated liquid impact has a great influence on the repeatability and the confidence of the dynamic sensitivity of the pressure sensor 41, and the pressure closed-loop feedback repeated for a long time also increases the burden of an actuator in the control system 4, so that the reliability of the whole control system 4 is weakened.

In view of the above, the present embodiment provides a ventricular assist system based on the same inventive concept and in combination with the above description of the flushing device 2 of each embodiment.

As shown in fig. 10 and 11, a ventricular assist system includes: the flushing device 2, the pumping system 3, the control system 4 and the catheter 5 of any of the above embodiments; the pumping system 3 comprises a pumping motor 31, a steel wire pipe 32 and an impeller which is in transmission connection with an output shaft of the pumping motor 31 and is arranged in the steel wire pipe 32; the control system 4 includes a pressure sensor 41 and a controller 42 electrically connected to the power motor 6.

The liquid outlet end of the hose 21 is connected with the liquid inlet side of the pumping motor 31 in the pumping system 3 through the inner cavity of the conduit 5, the steel wire pipe 32 is provided with a liquid outlet 322 configured to discharge the flushing liquid in the pumping system 3, and the liquid outlet 322 is positioned between the pumping motor 31 and the impeller; the pressure sensor 41 is arranged at the liquid outlet section of the hose 21 to detect the pressure of the flushing liquid output by the flushing device 2; the controller 42 controls the output rotation speed of the power motor 6 according to the flushing liquid pressure to maintain the flushing liquid pressure at 300 to 1500 mmHg.

Optionally, the ventricular assist system further comprises a main unit, the power motor 6 is mounted in the main unit and the output shaft extends out of the main unit. The flushing device 2 is detachably mounted to the main unit so that the wheel shaft 11 is in driving connection with the output shaft of the power motor 6.

Optionally, the output end of the hose 21 is sequentially connected with the filter 7 and the pressurized liquid pipe 9, and the output end of the pressurized liquid pipe 9 enters the inner cavity of the conduit 5 through the junction box 8 and is connected with the liquid inlet side of the pumping motor 31.

The rotational speed of the wheel spindle 11 is automatically controlled by the control system 4 depending on the magnitude of the desired flushing pressure. To prevent blood from entering the interior of the motor of the pumping system 3, a flushing pressure greater than the blood pumping pressure of the pumping system 3 is typically required, the flushing pressure typically being 300-.

Optionally, the preset flush pressure value is 300mmHg, 400mmHg, 600mmHg, 800mmHg, 1000mmHg, 1300mmHg or 1500 mmHg.

Because the washing liquid pulsation that the washing device 2 of this embodiment exported is less, consequently can shorten the regulation time of control system 4, reduce the regulation number of times, reduce the operating pressure of control system 4, prolong its life.

It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.

The description of the present application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the application in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the application and the practical application, and to enable others of ordinary skill in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.

Claims

1. A linear drive structure, comprising: the wheel shaft, a plurality of eccentric wheels and the peristaltic sliding plate;

the eccentric wheels are sequentially arranged on the wheel shaft in a transmission manner along the axial direction, and each eccentric wheel sequentially deflects towards the same wheel shaft in the circumferential direction by the same angle from the head end to the tail end; each eccentric wheel is sleeved with one peristaltic sliding plate, the peristaltic sliding plates reciprocate along the radial direction of the wheel shaft along with the rotation of the eccentric wheel, and the reciprocating directions of all the peristaltic sliding plates are parallel to each other; the end part of the peristaltic sliding plate along the moving direction is a pressing part which is configured to press a hose; the outer contour surface of the extrusion part is a conical cambered surface protruding outwards.

2. The linear driving structure as claimed in claim 1, wherein the curve saturation value Rho of the conic surface is greater than or equal to 0.8.

3. The linear drive configuration according to claim 1, characterized in that the deflection angle of adjacent eccentrics is 20 ° to 40 °.

4. The linear drive configuration according to claim 1, wherein each of the creep slides is provided with a support projection of a convex surface, and adjacent two of the creep slides are abutted by the respective support projections.

5. An irrigation device, comprising:

a housing having a drive chamber therein, the drive chamber having a linear drive arrangement according to any one of claims 1 to 4 mounted therein; at least one end of the wheel shaft extends out of the driving cavity and is used for being in transmission connection with the power motor;

the upper cover is detachably arranged at the top of the shell, an action cavity is formed between the upper cover and the shell, and a hose for guiding flushing liquid is arranged in the action cavity in a penetrating manner; the driving cavity is provided with an opening communicated with the action cavity, the extrusion part extends into the action cavity through the opening, and the hose is extruded periodically;

the buffer plate is arranged in the action cavity, the bottom of the buffer plate is in contact with the hose, and the top of the buffer plate is arranged on the upper cover.

6. The flushing device of claim 5 wherein the height of the gap between the top end of the squeeze portion and the bottom of the cushion plate in a free state is equal to twice the wall thickness of the hose.

7. The flushing device of claim 5, wherein a plurality of buffer springs are mounted between the buffer plate and the upper cover, and are spaced apart corresponding to the axis of the hose.

8. The flushing device of claim 7 wherein the damping spring is a compression spring and the damping spring has a shear modulus of 70000-.

9. The flushing device of claim 5, wherein the side wall of the driving cavity close to the opening is provided with a plurality of guide protrusions at intervals along the axial direction of the wheel shaft, and the peristaltic slide plate is installed between two adjacent guide protrusions.

10. A ventricular assist system, comprising: the irrigation device, pumping system, control system and catheter of any of claims 5 to 9; the pumping system comprises a pumping motor, a steel wire pipe and an impeller which is in transmission connection with an output shaft of the pumping motor and is arranged in the steel wire pipe; the control system comprises a pressure sensor and a controller electrically connected with the power motor;

the liquid outlet end of the hose is connected with the liquid inlet side of a pumping motor in the pumping system through the inner cavity of the guide pipe, a liquid outlet configured to discharge flushing liquid in the pumping system is arranged on the steel wire pipe, and the liquid outlet is positioned between the pumping motor and the impeller; the pressure sensor is arranged at the liquid outlet section of the hose so as to detect the pressure of flushing liquid output by the flushing device; the controller controls an output rotation speed of the power motor according to the flushing liquid pressure to maintain the flushing liquid pressure at 300 to 1500 mmHg.