Liquid delivery pump and ventricular assist system

Abstract

The application relates to a liquid feeding pump and a ventricular assist system. The liquid feeding pump comprises a fixing base, a bottom shell, a rotating mechanism and a driving element. The bottom shell is connected with the fixing base, and the bottom shell has a matching surface which is in the shape of a circular arc. The rotating mechanism is rotatably arranged on the fixing base, and the rotating mechanism comprises a plurality of spaced-arranged rolling shafts. The matching surface of the bottom shell and the rolling shafts have a containing space capable of placing a pump tube. The driving element can drive the rolling shafts to rotate, so that the rolling shafts alternately extrude the pump tube. The outer circumferential surfaces of the rolling shafts are all inscribed in a virtual toric surface, and the toric surface and the matching surface are arranged on the same central axis. Therefore, when the rolling shafts alternately extrude the pump tube, the distance between each rolling shaft and the matching surface of the bottom shell is constant, which is beneficial to applying a constant extrusion force to the pump tube, thereby reducing the instantaneous flow fluctuation of the output liquid, improving the flow accuracy of the liquid output to the intervention pump, and improving the safety of the ventricular assist system.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to infusion pumps and ventricular assist systems. Background Technology

[0002] In the field of interventional medicine, infusion pumps are often used in conjunction with interventional ventricular assist devices (also known as interventional pumps). However, the precision of current infusion pumps is relatively low. During the process of the pump tube being squeezed by the rotating mechanism of the infusion pump, uneven force on the pump tube can easily occur, which in turn leads to fluctuations in the instantaneous flow rate of the fluid at the outlet of the pump tube. This results in low accuracy of the fluid flow rate provided by the infusion pump, affecting the safety of the ventricular assist system. At the same time, it can also easily cause excessive local pressure on the pump tube, thereby accelerating the fatigue and cracking of the pump tube and shortening its service life. Utility Model Content

[0003] Based on this, this application provides a fluid delivery pump and a ventricular assist system to improve the flow accuracy of the fluid delivery pump and the safety of the ventricular assist system.

[0004] In a first aspect, this application provides a liquid delivery pump, which includes a fixed base, a bottom shell, a rotating mechanism, and a driving component;

[0005] The bottom shell is connected to the fixed base, and the bottom shell has a mating surface, which is arc-shaped.

[0006] The rotating mechanism is rotatably mounted on the fixed base. The rotating mechanism includes a plurality of spaced rollers. There is a receiving space between the mating surface of the bottom shell and the rollers, which can accommodate the pump pipe.

[0007] The drive unit is capable of driving the plurality of rollers to rotate, so that the plurality of rollers alternately squeeze the pump tube;

[0008] The outer peripheral surfaces of multiple rollers are all inscribed within the same virtual annular surface, and the annular surface and the mating surface are arranged along the same central axis.

[0009] One possible implementation also includes at least one of the following technical features:

[0010] Multiple rollers are evenly arranged circumferentially along the annular surface, and the number of rollers is N. The central angle corresponding to the arc containing the mating surface is defined as θ. <θ≤ +2°;

[0011] The radius of the toroidal surface is defined as r, the radius of the mating surface is defined as R, and the wall thickness of the portion of the pump pipe located in the receiving space is defined as h, where R = r + 2 × h.

[0012] In one possible implementation, the rotating mechanism further includes a first turntable and a second turntable disposed opposite to each other, and a connecting shaft fixedly connected to the first turntable and the second turntable. The roller is located between the first turntable and the second turntable and is sleeved on the connecting shaft, and the roller is rotatable relative to the connecting shaft. The driving member is fixedly connected to at least one of the first turntable and the second turntable.

[0013] In one possible implementation, the pump further includes a top shell and two clamping members. The top shell is fixedly connected to the fixed base. The bottom shell is movable relative to the fixed base to change the size of the receiving space. Both clamping members are fixedly connected to the bottom shell and are located between the top shell and the bottom shell, respectively on both sides of the mating surface. The top shell has a first limiting groove, and the clamping members have a second limiting groove. The first limiting groove and the second limiting groove together form a clamping hole, which can accommodate the pump tube and communicates with the receiving space.

[0014] In one possible implementation, the bottom shell is movable relative to the fixed base to change the size of the receiving space; the liquid delivery pump further includes a stop assembly connected to the bottom shell; when the multiple rollers alternately squeeze the pump tube to subject the bottom shell to compressive force, the stop assembly can prevent the bottom shell from moving to maintain the size of the receiving space.

[0015] In one possible implementation, the liquid delivery pump further includes a top shell, a rotating shaft, and a reciprocating motion mechanism; the top shell is fixedly connected to the fixed base; the rotating shaft is rotatably connected to the top shell; the reciprocating motion mechanism is connected to the rotating shaft, the bottom shell, and the fixed base, and the reciprocating motion mechanism can convert rotation into linear movement so that the bottom shell moves with the rotation of the rotating shaft; wherein, the stop component is fixedly connected to the rotating shaft, and when the bottom shell is in the working position, the stop component can automatically prevent the bottom shell from moving.

[0016] One possible implementation includes at least one of the following technical features:

[0017] The stop assembly includes a damping device, which includes a body and a rod. The body is fixedly connected to the top shell, the rod is rotatably connected to the body, and the rod is fixedly connected to the rotating shaft. When the multiple rollers alternately squeeze the pump pipe and cause the bottom shell to be subjected to compressive force, the body can apply a corresponding damping force to the rod to prevent the bottom shell from moving.

[0018] The reciprocating motion mechanism includes a driving member, a transmission rod, and a moving component. The driving member is fixedly connected to the rotating shaft, the transmission rod is hinged to the driving member and the moving component, the moving component is fixedly connected to the bottom shell, the fixed seat is provided with a guide member, and the moving component is slidably connected to the guide member.

[0019] In one possible implementation, the pump further includes a top housing and a rotating shaft, the top housing being fixedly connected to the fixed base; the rotating shaft being rotatably connected to the top housing; a stop assembly being connected to the rotating shaft, the bottom housing, and the fixed base, the stop assembly being capable of converting rotation into linear movement so that the bottom housing moves with the rotation of the rotating shaft; and the stop assembly being capable of preventing the bottom housing from moving when the bottom housing is in the working position.

[0020] In one possible implementation, the stopping assembly includes a driving member, a transmission rod, a first hinge member, a second hinge member, and a moving assembly. The driving member has a first through hole and a second through hole, and the transmission rod has a third through hole and a fourth through hole. The driving member is sleeved on the rotating shaft through the first through hole and fixedly connected to the rotating shaft. The driving member is rotatably connected to the first hinge member through the second through hole. The transmission rod is rotatably connected to the first hinge member through the third through hole and rotatably connected to the second hinge member through the fourth through hole. The moving assembly is rotatably connected to the second hinge member and fixedly connected to the bottom shell. The fixed base is provided with a guide member, and the moving assembly is slidably connected to the guide member.

[0021] The first force line of the active component is defined as a straight line connecting the center of the first through hole and the center of the second through hole; the second force line of the transmission rod is defined as a straight line connecting the center of the third through hole and the center of the fourth through hole; when the multiple rollers alternately squeeze the pump tube to subject the bottom shell to compressive force, the first force line of the active component and the second force line of the transmission rod tend to be parallel, thereby preventing the bottom shell from moving.

[0022] Secondly, this application provides a ventricular assist system, which includes an interventional pump, a fluid storage device, a pump tube, and the aforementioned fluid delivery pump. The pump tube has an inlet end and an outlet end. The inlet end is connected to the fluid storage device, and the outlet end is connected to the interventional pump. A portion of the pump tube is located within the fluid delivery pump. The fluid storage device can supply liquid to the pump tube, and the fluid delivery pump can drive the liquid in the pump tube to flow into the interventional pump.

[0023] The aforementioned fluid delivery pump includes a fixed base, a base shell, and a drive component. In this application, the base shell is connected to the fixed base, and a rotating mechanism is rotatably mounted on the fixed base. The rotating mechanism includes multiple spaced rollers, and the drive component drives the multiple rollers to rotate, causing them to alternately squeeze the pump tube. As the rollers squeezing the pump tube move forward, a negative pressure is created inside the pump tube, and the fluid inside the pump tube also moves forward, enabling it to be pumped to the interventional pump connected to the pump tube. Since the outer circumferential surfaces of the multiple rollers are all tangent to a virtual annular surface, compared to the non-arc-shaped mating surface of the base shell, the mating surface of the base shell in this application is arc-shaped, and the annular surface and the mating surface of the base shell are arranged along the same central axis. Therefore, when the multiple rollers alternately squeeze the pump tube, the distance between each roller and the mating surface of the base shell remains constant. This facilitates the application of a constant squeezing force to the pump tube, thereby reducing the instantaneous flow fluctuation of the output fluid, improving the flow accuracy of the fluid output to the interventional pump, and enhancing the safety of the ventricular assist system. In addition, applying constant compressive force to the pump tube can prevent excessive local pressure on the pump tube, thereby reducing pump tube fatigue and cracking and helping to extend the service life of the pump tube. Attached Figure Description

[0024] Figure 1 This is a perspective view of the liquid delivery pump according to the first embodiment of this application.

[0025] Figure 2 for Figure 1 Exploded view of the structure.

[0026] Figure 3 This is a schematic diagram of the roller and the bottom shell according to the first embodiment of this application.

[0027] Figure 4 This is an exploded view of the rotating mechanism according to the first embodiment of this application.

[0028] Figure 5 This is a perspective view of the liquid delivery pump with its top shell bursting open in the first embodiment of this application.

[0029] Figure 6 This is a side view of the liquid delivery pump in the first embodiment of this application.

[0030] Figure 7 This is a cross-sectional view of a portion of the structure in the first embodiment of this application.

[0031] Figure 8 This is an exploded view of the liquid delivery pump according to the second embodiment of this application.

[0032] Figure 9 This is a structural schematic diagram of the driving member, transmission rod, first hinge member, and second hinge member according to the second embodiment of this application.

[0033] Figure 10This is a schematic diagram of the structure of the driving member and transmission rod in the second embodiment of this application.

[0034] Icon labels:

[0035] Liquid pump 1; Vertical direction X; Fixed base 10; Guide component 111; Bottom shell 20; Mating surface 21; Receiving space S; Rotating mechanism 30; Roller 31; Outer peripheral surface 310; Through hole 311; Annular surface 300; First turntable 32; Second turntable 33; Connecting shaft 34; Cap 341; Slot 342; Snap ring 35; Rotation axis O1; Driving component 40; Output shaft 41; Stop assembly 50; Damping device 51; Body 511; Rod 512; Second driving component 52; First through hole 52a; Second through hole 52b; Third through hole 53a; Fourth through hole 53b; Second transmission rod 5 3; First hinge member 54; Second hinge member 55; Second moving component 56; Fifth through hole 56a; First force line M1; Second force line M2; Second plate 561; Second moving component 562; Top shell 60; First side wall 61; Second side wall 62; Top wall 63; Panel 64; First limiting groove 65; Clamping hole 66; Rotating shaft 70; Rotation axis O2; Reciprocating motion mechanism 80; First driving component 81; First transmission rod 82; First moving component 85; Plate 851; Moving component 852; Clamping component 853; Second limiting groove 854; Fifth through hole 85a; Drive handle 90. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] This application provides a ventricular assist system, which includes a fluid delivery pump 1, a pump tube, an interventional pump, and a fluid storage device. The pump tube has an inlet end and an outlet end. The inlet end is connected to the fluid storage device, and the outlet end is connected to the interventional pump. A portion of the pump tube is located in the fluid delivery pump 1. The fluid storage device can supply liquid to the pump tube, and the fluid delivery pump 1 can drive the liquid in the pump tube to flow into the interventional pump.

[0043] The delivery pump 1 and the storage device are located outside the patient's body. The interventional pump is inserted percutaneously into the patient's blood vessels and enters the patient's heart to pump blood from the patient's ventricles into the arteries.

[0044] The interventional pump includes an impeller, a drive module, and a motor housing. The drive module is located inside the motor housing and drives the impeller to rotate. The drive module has a drive shaft that passes through the motor housing and is connected to the impeller. Since blood can enter the motor housing through the gap between the drive shaft and the motor housing, a liquid flowing in the opposite direction to the blood flow needs to be introduced into the motor housing to create a countercurrent and prevent blood from entering the motor housing.

[0045] The pump tube's outlet end is connected to the motor housing. Liquid enters the motor housing through the outlet end and flows out through the gap between the drive shaft and the motor housing. To ensure sufficient pressure in the liquid at the gap between the drive shaft and the motor housing to prevent blood from flowing into the motor housing, the liquid entering the motor housing needs to have high flow rate accuracy. To minimize the size of the interventional pump, a liquid pressure detection device is typically not installed inside. Instead, the pressure at the outlet end of the pump tube is controlled to maintain the liquid pressure at the gap between the drive shaft and the motor housing. Since the pressure at the outlet end of the pump tube needs to be maintained by the liquid flow rate in the pump tube, the delivery pump must have high flow rate accuracy.

[0046] It should be noted that the fluid delivery pump 1 can also be used in other scenarios that require power to supply fluid, and is not limited to ventricular assist systems.

[0047] See Figures 1-3 As shown, in the first embodiment, the liquid delivery pump 1 includes a fixed base 10, a bottom shell 20, a rotating mechanism 30, and a driving component 40. The fixed base 10 serves as the mounting foundation for structures such as the bottom shell 20, the rotating mechanism 30, and the driving component 40 in the liquid delivery pump 1. The fixed base 10 is generally a square plate.

[0048] The bottom shell 20 is connected to the fixed base 10. The bottom shell 20 has a mating surface 21, which is arc-shaped.

[0049] The rotating mechanism 30 is rotatably mounted on the fixed base 10. The rotation axis O1 of the rotating mechanism 30 (e.g., Figure 6 The rotating mechanism 30 is fixed relative to the fixed base 10. Specifically, the rotating mechanism 30 is approximately cylindrical. The rotation axis O1 of the rotating mechanism 30 is the central axis of the rotating mechanism 30, and the rotation of the rotating mechanism 30 is a rotation about its own central axis. The rotating mechanism 30 and the bottom shell 20 are located on the same side of the fixed base 10.

[0050] The rotating mechanism 30 includes a plurality of spaced rollers 31. The rollers 31 are cylindrical. The outer peripheral surfaces 310 of the plurality of rollers 31 are all inscribed in the same virtual annular surface 300, and the annular surface 300 and the mating surface 21 are arranged on the same central axis M. There is a receiving space S between the rollers 31 and the mating surface 21 of the bottom shell 20, which can accommodate the pump pipe.

[0051] The drive unit 40 is fixed to the fixed base 10, specifically, on the side of the fixed base 10 opposite to the bottom shell 20. The drive unit 40 can be a motor, and it has an output shaft 41 that passes through the fixed base 10 and is fixedly connected to the rotating mechanism 30. The drive unit 40 can drive multiple rollers 31 to rotate, so that the multiple rollers 31 alternately squeeze the pump tube. As the rollers 31 that squeeze the pump tube move forward, a negative pressure is formed inside the pump tube, so that the liquid inside the pump tube also moves forward and can be pumped to the intervention pump connected to the pump tube.

[0052] Since the outer circumferential surfaces of multiple rollers 31 are all tangent to the virtual annular surface 300, and the mating surface of the base shell 20 is non-arc-shaped (unlike the non-arc-shaped surface of the base shell 20), the mating surface of the base shell 20 is arc-shaped, and the annular surface 300 and the mating surface 21 of the base shell 20 are arranged along the same central axis, the distance between each roller 31 and the mating surface 21 of the base shell 20 remains constant when the multiple rollers 31 alternately squeeze the pump tube. This facilitates the application of a constant squeezing force to the pump tube, thereby reducing the instantaneous flow fluctuation of the output fluid, improving the flow accuracy of the fluid output to the interventional pump, and enhancing the safety of the ventricular assist system. Furthermore, applying a constant squeezing force to the pump tube can prevent excessive local pressure on the pump tube, thus reducing fatigue and cracking and extending the service life of the pump tube.

[0053] Further, see Figure 4 As shown, the radius of the toroidal surface 300 is defined as r, the radius of the mating surface 21 is defined as R, and the wall thickness of the portion of the pump tube located in the receiving space S is defined as h, where R = r + 2 × h. Therefore, the portion of the pump tube squeezed by the roller 31 has almost no internal gaps, and the liquid inside the pump tube is squeezed to move in a single direction without backflow, thus improving the accuracy of the output liquid flow rate.

[0054] Furthermore, multiple rollers 31 are evenly arranged circumferentially along the annular surface 300. The number of rollers 31 is N, and the central angle corresponding to the arc containing the mating surface 21 is defined as θ; where θ = <θ≤ +2°. For example, see [link / reference]. Figure 3 As shown, the number of rollers 31, N=4, and the central angle corresponding to the arc where the mating surface 21 is located is 90°<θ≤92°. In other embodiments, the number of rollers 31, N, can also be 3, 5, or 6, etc.

[0055] During the pumping process, the rollers 31 alternately squeeze and release the pump tube. If one of two adjacent rollers 31 has already released the pump tube while the other roller 31 has not yet squeezed the pump tube to push the liquid, the liquid output flow rate will drop instantly or even drop to zero, affecting the flow accuracy. If multiple rollers 31 squeeze the pump tube simultaneously for a long time, the friction generated by each roller 31 will increase the power consumption of the drive component 40 that drives the rollers 31. Therefore, multiple rollers 31 are evenly arranged circumferentially along the annular surface 300, with N rollers 31 in total. The central angle between any two adjacent rollers 31 is 360° / N, and the central angle θ corresponding to the arc of the mating surface 21 is also 360° / N. This arrangement ensures that when one of the two adjacent rollers 31 leaves one side of the mating surface 21, the other roller 31 presses against the other side of the mating surface 21, squeezing the pump tube to push the liquid. Theoretically, this ensures that only one roller 31 always squeezes the pump tube to push the liquid, resulting in a more stable liquid output flow rate and improved output flow rate accuracy. Simultaneously, it avoids multiple rollers 31 squeezing the pump tube simultaneously for extended periods, thus reducing the power consumption of the drive component 40. However, in practice, due to manufacturing tolerances and pump tube deformation, it is difficult to guarantee that only one roller 31 always squeezes the pump tube to push the liquid. Therefore, θ = <θ≤ +2°, most of the time only one roller 31 bears the squeezing effect, but at the moment when two adjacent rollers 31 meet, they squeeze the pump tube together for a very short time, so as to improve the accuracy of the output liquid flow rate and minimize the power consumption of the drive component 40.

[0056] Further, see Figure 2 and Figure 4 As shown, the rotating mechanism 30 includes a first turntable 32, a second turntable 33, and a connecting shaft 34, with the first turntable 32 and the second turntable 33 arranged opposite to each other. Both the first turntable 32 and the second turntable 33 are discs. The connecting shaft 34 is fixedly connected to the first turntable 32 and the second turntable 33. A roller 31 is located between the first turntable 32 and the second turntable 33, and the roller 31 has a through hole 311 along its axial direction, through which the connecting shaft 34 passes; the roller 31 is rotatable relative to the connecting shaft 34. The driving member is fixedly connected to at least one of the first turntable 32 and the second turntable 33. Therefore, when the roller 31 squeezes the pump tube and moves forward, compared to the case where the roller 31 cannot rotate relative to the connecting shaft 34, the friction between the roller 31 and the pump tube can be reduced, thereby reducing the power consumption of the driving member 40 and extending the life of the pump tube.

[0057] Specifically, one end of the connecting shaft 34 is provided with a cap 341, and the connecting shaft 34 is provided with a groove 342 in its circumference. The connecting shaft 34 passes through the first turntable 32, the roller 31, and the second turntable 33. The cap 341 abuts against the side of the first turntable 32 away from the second turntable 33. The groove 342 is located on the side of the second turntable 33 away from the first turntable 32. The rotating mechanism 30 also includes a retaining spring 35, which is engaged in the groove 342 and abuts against the second turntable 33. In other embodiments, the connecting shaft 34 is welded to the first turntable 32 and the second turntable 33.

[0058] Specifically, the rotating mechanism 30 also includes a central shaft 36, which is fixedly connected to the first turntable 32 and the second turntable 33. Further, the central shaft 36 is fixedly connected to the center of the first turntable 32 and the center of the second turntable 33. The axial length of the central shaft 36 is slightly greater than the axial length of the roller 31, thus preventing contact between the roller 31 and the first turntable 32 and the second turntable 33. When the roller 31 rotates relative to the connecting shaft 34, this helps reduce friction between the roller 31 and the first turntable 32 and the second turntable 33, thereby increasing the service life of the rotating mechanism 30.

[0059] Furthermore, the central shaft 36 is provided with a through hole 360 ​​along its axial direction. The output shaft 41 of the drive member 40 passes through the through hole 360 ​​and is fixedly connected to the central shaft 36. The cross-section of the through hole 360 ​​on the side near the output shaft 41 is "D" shaped, and the cross-section of the part of the output shaft 41 inserted into the through hole 360 ​​is also "D" shaped. The fixed connection is achieved through structural limiting.

[0060] Refer to Figure 1 As shown, the bottom shell 20 can move relative to the fixed base 10 to change the size of the receiving space S between the bottom shell 20 and the rotating mechanism 30. When the receiving space S increases, it is easier to pick up and place the pump tube, thereby facilitating the replacement of the pump tube.

[0061] However, when multiple rollers 31 alternately squeeze the pump tube, the increased fluid resistance inside the pump tube due to the squeezing of the pump tube by the rollers 31 or accidental operation can easily cause the bottom shell 20 to move away from the fixed seat 10 in the vertical direction X and move away from the rotating mechanism 30. This increases the housing space S, which can easily lead to insufficient squeezing force applied by the rollers 31 to the pump tube, resulting in backflow of liquid inside the pump tube. This can lead to a lower accuracy of the liquid flow rate pumped to the intervention pump.

[0062] To improve the accuracy of the fluid flow rate pumped to the interventional pump, the fluid delivery pump 1 also includes a stop assembly 50, which is connected to the base housing 20. When multiple rollers 31 alternately compress the pump tubing, causing the base housing 20 to be subjected to compressive force, the stop assembly 50 can prevent the base housing 20 from moving, thereby maintaining the size of the receiving space S, reducing the probability of backflow of fluid in the pump tubing, and thus improving the accuracy of the fluid flow rate provided by the fluid delivery pump 1, thereby enhancing the safety of the ventricular assist system.

[0063] When multiple rollers 31 alternately squeeze the pump tube, causing the bottom shell 20 to be subjected to compressive force, the bottom shell 20 is in the working position.

[0064] For example, 1. Figure 2 and Figure 5 As shown, the liquid delivery pump 1 also includes a top shell 60, a rotating shaft 70, and a reciprocating motion mechanism 80. The top shell 60 is fixedly connected to the fixed base 10, specifically by means of screw connection or welding. The top shell 60 and the bottom shell 20 are located on the same side of the fixed base 10, and the rotating mechanism 30 is located between the top shell 60 and the bottom shell 20. The top shell 60 includes a first side wall 61 and a second side wall 62 opposite to each other, a top wall 63 connected to the end sides of the first side wall 61 and the second side wall 62, and a panel 64 connected to the first side wall 61, the second side wall 62, and the top wall 63. At least one of the first side wall 61, the second side wall 62, and the top wall 63 is fixedly connected to the fixed base 10. The panel 64 is parallel to and spaced apart from the fixed base 10. In other embodiments, the panel 64 and the fixed base 10 may not be parallel.

[0065] The rotating shaft 70 is rotatably connected to the top shell 60. One end of the rotating shaft 70 extends towards the first sidewall 61, and the other end extends towards the second sidewall 62. The top shell 60 provides support and restraint for the rotating shaft 70, ensuring that the axis of rotation O2 of the rotating shaft 70 (as shown in the image) remains within its proper range. Figure 7 (As shown) Fixed relative to the top shell 60.

[0066] The reciprocating motion mechanism 80 is connected to the rotating shaft 70, the bottom shell 20, and the fixed base 10. The reciprocating motion mechanism 80 can convert rotation into linear movement, so that the bottom shell 20 moves with the rotating shaft 70. The reciprocating motion mechanism 80 is located between the top shell 60 and the fixed base 10, thereby providing protection for the reciprocating motion mechanism 80 and enhancing its safety.

[0067] The stop assembly 50 is fixedly connected to the rotating shaft 70. When the bottom shell 20 is in the working position, the stop assembly 50 can automatically prevent the bottom shell 20 from moving. Therefore, when the bottom shell 20 moves to the working position in the vertical direction X, there is no need for additional tightening, turning, or locking actions such as pins to prevent the bottom shell 20 from moving in the vertical direction X due to compressive force. The two separate operation steps of moving the bottom shell 20 to the working position in the vertical direction X and preventing the bottom shell 20 from moving are simplified into a single action, making the operation simpler and more convenient, and improving the efficiency of operation.

[0068] The reciprocating motion mechanism 80 includes a first driving member 81, a first transmission rod 82, and a first moving component 85.

[0069] The first driving component 81 is fixedly connected to the rotating shaft 70, which can be achieved through welding, bonding, or other methods. The geometric center of the first driving component 81 is spaced apart from the center of its rotation. The first transmission rod 82 is hinged to the first driving component 81 and the first moving component 85. The first moving component 85 is fixedly connected to the base shell 20, specifically through screw connection or welding.

[0070] The first movable component 85 includes a first plate 851 and a first movable member 852, which are fixedly connected. The first plate 851 is fixedly connected to the bottom shell 20, specifically, by welding, screw connection, or other methods. The movable member 852 is slidably connected to the guide member 111. For example, the first movable member 852 is a roller or a protrusion.

[0071] The fixed base 10 is provided with a guide 111. The guide 111 extends in the vertical direction X. The first moving component 85 is slidably connected to the guide 111. Exemplarily, the guide 111 is a groove. In other embodiments, the guide 111 may also be a track protruding from the fixed base 10, and correspondingly, the moving component 852 is a protrusion.

[0072] The length of the guide member 111 along the vertical direction X can limit the rotatable angle of the rotating shaft 70. Specifically, the minimum length of the guide member 111 along the vertical direction X is 10mm to 15mm. When the first moving member 852 slides to one end of the guide member 111 ( Figure 2 When the bottom shell 20 is in the upper middle position, it moves to the working position.

[0073] like Figure 5 and Figure 6As shown, the liquid delivery pump 1 also includes two clamping members 853, both of which are fixedly connected to the bottom shell 20. Specifically, the clamping members 853 are fixedly connected to the first plate 851, and the first plate 851 is fixedly connected to the bottom shell 20, thus achieving the fixed connection between the clamping members 853 and the bottom shell 20. Both the clamping members 853 and the first plate 851 can move relative to the fixed base 10.

[0074] Two clamping members 853 are located between the top shell 60 and the bottom shell 20, and are respectively located on both sides of the mating surface 21. The top shell 60 has a first limiting groove 65, and the clamping member 853 has a second limiting groove 854. The first limiting groove 65 and the second limiting groove 854 together form a clamping hole 66, which can accommodate the pump tube and communicates with the receiving space S. Thus, the two clamping holes 66 are respectively located on both sides of the mating surface 21, and both are located between the top shell 60 and the bottom shell 20. Furthermore, the two ends of the pump tube located between the mating surface 21 and the roller 31 pass through the clamping holes 66, allowing the portion of the pump tube in the liquid delivery pump 1 to extend in a roughly arc shape. This reduces the occurrence of excessive bending of the pump tube in the liquid delivery pump 1, thereby reducing the sudden change in liquid flow at the bend due to the bending of the pump tube, and improving the accuracy of the output liquid flow rate. Meanwhile, the two clamping holes 66 can limit the pump tube to reduce the risk of displacement of the pump tube when the rotating mechanism 30 and the bottom shell 20 cooperate to squeeze the pump tube.

[0075] See Figure 7 As shown, the stop assembly 50 includes a damping device 51, which is connected to the rotating shaft 70. The damping device 51 may include a body portion 511 and a rod portion 512. The body portion 511 is fixedly connected to the top shell 60, and the rod portion 512 is rotatably connected to the body portion 511 and fixedly connected to the rotating shaft 70. The rotation axis of the rod portion 512 coincides with the rotation axis O2 of the rotating shaft 70, which helps to reduce the volume occupied by the damping device 51 and the rotating shaft 70 in the liquid delivery pump 1. The rod portion 512 is partially inserted into the rotating shaft 70, thereby increasing the contact area between the rod portion 512 and the rotating shaft 70 and enhancing the connection strength.

[0076] The main body 511 may contain grease or gears, which can apply a damping force to the rod 512. When the multiple rollers 31 alternately squeeze the pump tube and subject the bottom shell 20 to a compressive force, the main body 511 can apply a corresponding damping force to the rod 512 to prevent the rod 512 from rotating with the shaft 70, thereby preventing the bottom shell 20 from moving.

[0077] Compared to traditional methods that use screws, clamps, etc. to restrict the rotation of the shaft 70 and apply a constant force to prevent the bottom shell 20 from moving, which can easily lead to excessive force causing accelerated wear and aging of the pump tube, or insufficient force to prevent the bottom shell 20 from moving, making it difficult to ensure the pump tube's lifespan while maintaining flow accuracy and stability, in this embodiment, the damping force provided by the damping device 51 is continuous and adaptive. The greater the pressure exerted on the bottom shell 20 by the rotating mechanism 30 pressing the pump tube, the greater the damping force provided by the damping device to prevent the bottom shell 20 from moving. Thus, in operating conditions where the pressure exerted on the bottom shell 20 changes periodically, the damping force provided by the damping device 51 can ensure the flow accuracy of the liquid delivery pump 1, while avoiding excessive compression of the pump tube in non-operating states, thereby effectively extending the service life of the pump tube.

[0078] like Figure 8 As shown, the liquid delivery pump 1 of the second embodiment has a structure that is largely the same as that of the liquid delivery pump 1 of the first embodiment. The difference lies in the stop assembly 50 of the liquid delivery pump 1 of the second embodiment, which is different from that of the first embodiment. In the second embodiment, the stop assembly 50 is connected to the rotating shaft 70, the bottom shell 20, and the fixed base 10. Specifically, the stop assembly 50 is fixed to the rotating shaft 70 and the bottom shell 20 by welding or screws, and the stop assembly 50 is slidably connected to the fixed base 10. The stop assembly 50 can convert rotation into linear movement, so that the bottom shell 20 moves with the rotation of the rotating shaft 70. When the bottom shell 20 is in the working position, the stop assembly 50 can automatically prevent the bottom shell 20 from moving. Thus, the stop assembly 50 has multiple functions, which helps to reduce the number of parts in the entire liquid delivery pump 1 and makes the liquid delivery pump 1 more compact.

[0079] Furthermore, when the bottom shell 20 moves to the working position in the vertical direction X, there is no need for additional tightening, turning, or locking actions such as pinning to prevent the bottom shell 20 from moving in the vertical direction X due to compressive force. The two separate operation steps of moving the bottom shell 20 to the working position in the vertical direction X and preventing the bottom shell 20 from moving in the vertical direction X due to compressive force are simplified into a single continuous action, making the operation simpler and more convenient, and improving operational efficiency.

[0080] The stop assembly 50 is located between the top shell 60 and the fixed base 10, which can provide a certain degree of protection for the reciprocating motion mechanism 80 and enhance its safety.

[0081] like Figures 8-10 As shown, the stop assembly 50 includes a second driving member 52, a second transmission rod 53, a first hinge member 54, a second hinge member 55, and a second moving assembly 56.

[0082] The second driving member 52 is fixedly connected to the rotating shaft 70, which can be achieved through welding, bonding, or other methods. Specifically, the second driving member 52 has a first through hole 52a and a second through hole 52b. The second driving member 52 is sleeved on the rotating shaft 70 through the first through hole 52a and fixedly connected to the rotating shaft 70. The center of the first through hole 52a is collinear with the rotation axis O2 of the rotating shaft 70, and the center of the first through hole 52a is the rotation center of the second driving member 52. The geometric center of the second driving member 52 is spaced apart from the center of the first through hole 52a. The second driving member 52 is rotatably connected to the first hinge member 54 through the second through hole 52b.

[0083] The second transmission rod 53 is hinged between the second driving member 52 and the second moving component 56. The second transmission rod 53 has a third through hole 53a and a fourth through hole 53b; the second transmission rod 53 is rotatably connected to the first hinge member 54 through the third through hole 53a, and to the second hinge member 55 through the fourth through hole 53b.

[0084] The second movable component 56 is rotatably connected to the second hinge member 55. Specifically, the second movable component 56 has a fifth through hole 56a, through which it is rotatably connected to the second hinge member 55. The second movable component 56 is fixedly connected to the bottom shell 20, specifically by means of screw connection or welding.

[0085] The first force line M1 of the second driving member 52 is defined as a straight line connecting the center of the first through hole 52a and the center of the second through hole 52b; the second force line M2 of the second transmission rod 53 is defined as a straight line connecting the center of the third through hole 53a and the center of the fourth through hole 53b. When the multiple rollers 31 alternately squeeze the pump tube to subject the bottom shell 20 to compressive force, that is, when the bottom shell 20 is in the working position, the first force line M1 of the second transmission rod 53 and the second force line M2 of the second driving member 52 tend to be parallel, thus preventing the bottom shell 20 from moving. Therefore, the stop assembly 50 can both convert rotation into linear movement so that the bottom shell 20 moves with the rotation of the shaft 70, and can also use the fact that the first force line M1 of the second transmission rod 53 and the second force line M2 of the second driving member 52 are in a dead position when they are nearly parallel, and thus more reliably prevent the bottom shell 20 from moving through mechanical self-locking.

[0086] The fact that the first force line M1 of the second transmission rod 53 and the second force line M2 of the second driving member 52 are nearly parallel means that the angle between the first force line M1 of the second transmission rod 53 and the second force line M2 of the second driving member 52 is less than 2°, such as 0° or 1°.

[0087] The second moving assembly 56 includes a second plate 561 and a second moving member 562, which are fixedly connected. The second plate 561 has a fifth through hole 56a, through which it is rotatably connected to the second hinge member 55. The second plate 561 is fixedly connected to the bottom shell 20, specifically, by welding, screw connection, or other methods. The second moving member 562 is slidably connected to the guide member 111. Exemplarily, the second moving member 562 is a roller or a protrusion. When the second moving member 562 slides to one end of the guide member 111, the bottom shell 20 moves to the working position.

[0088] In some embodiments, the liquid delivery pump 1 may also include a drive handle 90, which is connected to the rotating shaft 70, so that the user can rotate the rotating shaft 70 by rotating the drive handle 90, which is convenient for the user to operate.

[0089] The damping device 51 allows the user to rotate the shaft 70 by driving the handle 90, thereby moving the plate 851 and the bottom shell 20 in the vertical direction X, providing a certain tactile feedback. It also has a certain function to prevent accidental touch, avoiding accidental contact with the handle 90 that could cause the shaft 70 to rotate.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid delivery pump, characterized in that, The liquid delivery pump includes: Fixed base; A bottom shell is connected to the fixed base, and the bottom shell has a mating surface that is arc-shaped. A rotating mechanism is rotatably mounted on the fixed base. The rotating mechanism includes a plurality of spaced rollers, and there is a receiving space between the mating surface and the rollers for placing a pump pipe. A drive unit capable of driving the plurality of rollers to rotate, so that the plurality of rollers alternately squeeze the pump tube; The outer peripheral surfaces of multiple rollers are all inscribed within the same virtual annular surface, and the annular surface and the mating surface are arranged along the same central axis.

2. The liquid delivery pump according to claim 1, characterized in that, It also includes at least one of the following technical features: The radius of the toroidal surface is defined as r, the radius of the mating surface is defined as R, and the wall thickness of the portion of the pump pipe located in the receiving space is defined as h, where R = r + 2 × h; Multiple rollers are evenly arranged circumferentially along the annular surface, and the number of rollers is N. The central angle corresponding to the arc containing the mating surface is defined as θ. <θ≤ +2°.

3. The liquid delivery pump according to claim 1, characterized in that, The rotating mechanism further includes a first turntable, a second turntable, and a connecting shaft. The first turntable and the second turntable are arranged opposite to each other. The connecting shaft is fixedly connected to the first turntable and the second turntable. The roller is located between the first turntable and the second turntable. The roller has a through hole along its axial direction. The connecting shaft passes through the through hole and the roller can rotate relative to the connecting shaft. The driving member is fixedly connected to at least one of the first turntable and the second turntable.

4. The liquid delivery pump according to claim 1, characterized in that, The liquid delivery pump further includes a top shell and two clamping members. The top shell is fixedly connected to the fixed base. The bottom shell is movable relative to the fixed base to change the size of the receiving space. Both clamping members are fixedly connected to the bottom shell and are located between the top shell and the bottom shell, respectively on both sides of the mating surface. The top shell has a first limiting groove, and the clamping members have a second limiting groove. The first limiting groove and the second limiting groove together form a clamping hole, which can accommodate the pump tube and communicates with the receiving space.

5. The liquid delivery pump according to claim 1, characterized in that, The bottom shell is movable relative to the fixed base to change the size of the receiving space; the liquid delivery pump also includes a stop assembly connected to the bottom shell; when the multiple rollers alternately squeeze the pump tube to subject the bottom shell to compressive force, the stop assembly can prevent the bottom shell from moving to maintain the size of the receiving space.

6. The liquid delivery pump according to claim 5, characterized in that, The liquid delivery pump also includes a top shell, a rotating shaft, and a reciprocating motion mechanism; the top shell is fixedly connected to the fixed base; the rotating shaft is rotatably connected to the top shell; the reciprocating motion mechanism is connected to the rotating shaft, the bottom shell, and the fixed base, and the reciprocating motion mechanism can convert rotation into linear movement so that the bottom shell moves with the rotating shaft; wherein, the stop component is fixedly connected to the rotating shaft, and when the bottom shell is in the working position, the stop component can automatically prevent the bottom shell from moving.

7. The liquid delivery pump according to claim 6, characterized in that, Includes at least one of the following technical features: The stop assembly includes a damping device, which includes a body and a rod. The body is fixedly connected to the top shell, the rod is rotatably connected to the body, and the rod is fixedly connected to the rotating shaft. When the multiple rollers alternately squeeze the pump pipe and cause the bottom shell to be subjected to compressive force, the body can apply a corresponding damping force to the rod to prevent the bottom shell from moving. The reciprocating motion mechanism includes a driving member, a transmission rod, and a moving component. The driving member is fixedly connected to the rotating shaft, the transmission rod is hinged to the driving member and the moving component, the moving component is fixedly connected to the bottom shell, the fixed seat is provided with a guide member, and the moving component is slidably connected to the guide member.

8. The liquid delivery pump according to claim 5, characterized in that, The liquid delivery pump also includes a top shell and a rotating shaft. The top shell is fixedly connected to the fixed base. The rotating shaft is rotatably connected to the top shell. The stop assembly is connected to the rotating shaft, the bottom shell, and the fixed base. The stop assembly can convert rotation into linear movement so that the bottom shell can move. The stop assembly can also prevent the bottom shell from moving when the bottom shell is in the working position.

9. The liquid delivery pump according to claim 8, characterized in that, The stopping assembly includes a driving member, a transmission rod, a first hinge member, a second hinge member, and a moving assembly. The driving member has a first through hole and a second through hole, and the transmission rod has a third through hole and a fourth through hole. The driving member is sleeved on the rotating shaft through the first through hole and fixedly connected to the rotating shaft. The driving member is rotatably connected to the first hinge member through the second through hole. The transmission rod is rotatably connected to the first hinge member through the third through hole, and rotatably connected to the second hinge member through the fourth through hole. The moving assembly is rotatably connected to the second hinge member and fixedly connected to the bottom shell. The fixed base is provided with a guide member, and the moving assembly is slidably connected to the guide member. The first force line of the active component is defined as a straight line connecting the center of the first through hole and the center of the second through hole; the second force line of the transmission rod is defined as a straight line connecting the center of the third through hole and the center of the fourth through hole; when the multiple rollers alternately squeeze the pump tube to subject the bottom shell to compressive force, the first force line of the active component and the second force line of the transmission rod tend to be parallel, thereby preventing the bottom shell from moving.

10. A ventricular assist system, characterized in that, The ventricular assist system includes an interventional pump, a fluid storage device, a pump tubing, and a fluid delivery pump as described in any one of claims 1-9. The pump tubing has an inlet end and an outlet end, the inlet end being connected to the fluid storage device, the outlet end being connected to the interventional pump, and a portion of the pump tubing being located within the fluid delivery pump. The fluid storage device is capable of supplying fluid to the pump tubing, and the fluid delivery pump is capable of driving the fluid in the pump tubing to flow into the interventional pump.

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