Peristaltic pump and medical device

Abstract

The present invention discloses a peristaltic pump and a medical device, relating to the technical field of peristaltic pumps. The peristaltic pump includes a base, a delivery tube, a spiral extrusion module, and a control module. The base is provided with a receiving cavity, an outlet, and an inlet that communicate with the receiving cavity; the delivery tube is arranged in the receiving cavity along a linear direction, and both ends of the delivery tube extend to the outside of the base from the inlet and the outlet respectively; the spiral extrusion module is arranged in the receiving cavity, and the spiral extrusion module includes a plurality of extrusion mechanisms, and the plurality of extrusion mechanisms are tightly distributed around the delivery tube in a spiral shape along the direction from the inlet to the outlet; in the extrusion state, the extrusion mechanism applies an extrusion force extending along the radial direction of the delivery tube to the delivery tube; the control module is used to control the switching of each extrusion mechanism between the extrusion state and the relaxation state, so that the plurality of extrusion mechanisms sequentially and continuously extrude the delivery tube in the direction from the inlet to the outlet, so as to realize the spiral extrusion of the delivery tube. The purpose of the present invention is to improve the flow stability and delivery accuracy of the peristaltic pump.

Description

Technical Field

[0001] The present invention relates to the technical field of peristaltic pumps, and particularly to a peristaltic pump and a medical device. Background Art

[0002] A peristaltic pump is a positive-displacement pump that realizes fluid transportation by periodically compressing a flexible hose, and its working principle imitates the peristaltic movement of the biological digestive tract. When an external mechanical element (such as a roller or a pressing block) applies local extrusion to the hose, a closed chamber is formed inside the hose and moves along the pumping direction, thereby generating a directional fluid drive. Since the fluid only contacts the inner wall of the hose, the peristaltic pump has outstanding advantages such as no pollution, high sealing performance, and easy cleaning, and is widely used in medical infusion, food filling, chemical precision metering and other fields.

[0003] The core structure of a traditional peristaltic pump includes a flexible hose, a pump head housing, and a rotary / linear drive mechanism. Taking the mainstream roller-type peristaltic pump as an example: the hose is fixed in an arc-shaped pump groove, and the motor drives the rotor to drive 2-6 rollers to rotate continuously, and the rollers sequentially roll over the hose to generate extrusion waves. Another common solution is a linear pressing block type peristaltic pump, which uses a cylinder or a cam to push a sequence of pressing blocks for alternating compression. Both types of structures rely on the mechanical contact extrusion of rigid elements on the hose to achieve fluid propulsion through physical deformation.

[0004] However, under the intermittent extrusion mechanism of the traditional peristaltic pump, when the roller or the pressing block releases the hose, the elastic rebound of the hose will cause local negative pressure, resulting in reverse fluid flow. This pulsation not only affects the stability of the flow rate, but may also have an adverse impact on some flow-sensitive applications (such as precision chemical metering, micro drug delivery, etc.). Summary of the Invention

[0005] The main object of the present invention is to provide a peristaltic pump and a medical device, aiming to improve the flow stability and delivery accuracy of the peristaltic pump.

[0006] To achieve the above object, the present invention provides a peristaltic pump, comprising:

[0007] A base, the base is provided with a receiving cavity, and an outlet and an inlet communicating with the receiving cavity;

[0008] A delivery pipe, the delivery pipe is arranged in the receiving cavity along a linear direction, and both ends of the delivery pipe extend to the outside of the base from the inlet and the outlet respectively;

[0009] A screw extrusion module, the screw extrusion module is arranged in the accommodation cavity, the screw extrusion module includes a plurality of extrusion mechanisms, and the plurality of extrusion mechanisms are spirally and closely distributed around the conveying pipe along the direction from the inlet to the outlet; each extrusion mechanism has an extrusion state and a relaxation state. In the extrusion state, the extrusion mechanism applies an extrusion force extending radially along the conveying pipe to the conveying pipe; in the relaxation state, the extrusion mechanism releases the conveying; and,

[0010] A control module, the control module is used to control the switching of each extrusion mechanism between the extrusion state and the relaxation state, so that the plurality of extrusion mechanisms sequentially and continuously extrude the conveying pipe from the inlet to the outlet direction, so as to realize the screw extrusion of the conveying pipe.

[0011] In one embodiment, the extrusion mechanism includes:

[0012] A fixed seat, the fixed seat is arranged on the cavity wall of the accommodation cavity, and an airbag groove is formed on one side of the fixed seat facing away from the cavity wall of the accommodation cavity; and,

[0013] A micro air pump, the micro air pump includes a pump body, a micro airbag and an electromagnetic valve, at least part of the structure of the micro airbag is accommodated in the airbag groove, the air outlet of the pump body is communicated with the air inlet of the micro airbag, and the electromagnetic valve is arranged at the air inlet of the micro airbag and is electrically connected with the control module;

[0014] In the relaxation state, the micro airbag is arranged at an interval from the conveying pipe; in the extrusion state, the micro airbag extrudes the conveying pipe along the radial direction of the conveying pipe.

[0015] In one embodiment, the micro airbag includes:

[0016] An airbag wall, a cavity is formed inside the airbag wall, an R corner is formed at the root of the inner side of the airbag wall, and the maximum distance between the center of the R corner and the inner side of the airbag wall is at least 3 times the wall thickness of the airbag wall;

[0017] A piston body, the piston body is arranged at the root of the airbag wall, a chamfer is formed between the outer root of the airbag wall and the piston body, and the distance between the connection point of the chamfer and the piston entity and the center of the R corner is at least 0.5 times the wall thickness of the airbag wall; the end of the piston body away from the airbag wall is an arc structure for abutting against the conveying pipe.

[0018] In one embodiment, the airbag wall includes a straight wall section and a flared section connected to the straight wall section. One end of the straight wall section away from the flared section is the air inlet of the micro airbag. One end of the flared section away from the straight wall section is connected to the piston body. The flared section is formed into a bowl shape with an arc-shaped structure or a linear structure;

[0019] The solenoid valve is provided on the straight wall section.

[0020] In one embodiment, the piston body sequentially includes a fluororubber anti-corrosion layer, a Kevlar fiber tensile layer, and a silica gel sealing layer from the airbag wall to the outside.

[0021] In one embodiment, the chamfer includes a rounded corner and a reduced-edge corner, and the reduced-edge corner is arc-shaped or linear.

[0022] In one embodiment, the fixed seat includes:

[0023] A fixed bracket provided on the wall of the accommodation cavity. One side of the fixed bracket facing away from the wall of the accommodation cavity is provided with an airbag groove and a first fixing hole penetrating therethrough;

[0024] A buffer rubber block provided between the fixed bracket and the wall of the accommodation cavity. The buffer rubber block is provided with a second fixing hole corresponding to the first fixing hole;

[0025] A locking member passing through the first fixing hole and the second fixing hole, and the locking end of the locking member is locked to the wall of the accommodation cavity.

[0026] In one embodiment, the extrusion mechanism includes a micro motor, a mounting plate, and a jacking rod. The mounting plate is provided on the wall of the accommodation cavity. The micro motor is provided on the mounting plate. The driving end of the micro motor is in transmission connection with the jacking rod, and the jacking rod is used to abut against the delivery pipe to apply a radial extrusion force to the delivery pipe.

[0027] In one embodiment, the extrusion mechanism further includes an elastic reset member connecting the mounting plate and the jacking rod, and the elastic deformation amount increases during the process of the jacking rod approaching the delivery pipe.

[0028] The present invention also provides a medical device including the peristaltic pump as described above.

[0029] The peristaltic pump provided by the present invention realizes a continuous and uniform extrusion effect on the fluid in the delivery tube by setting a spiral extrusion module to extrude the delivery tube in a spiral manner, effectively reducing the pulsation during fluid delivery and improving the delivery stability of the fluid. Specifically, multiple extrusion mechanisms are tightly distributed in a spiral shape along the linear direction of the delivery tube, ensuring that when the extrusion mechanisms act in sequence, a continuous extrusion wave along the length direction of the delivery tube can be formed. When the peristaltic pump operates, the control module activates each extrusion mechanism in sequence according to a preset program. After receiving the control signal, each extrusion mechanism changes from the relaxed state to the extrusion state, applying a radial extrusion force to the delivery tube. Through sequential activation, after each extrusion mechanism completes the extrusion action, it will return to the relaxed state according to the instruction of the control module. During the process of the previous extrusion mechanism entering the relaxed state, the next extrusion mechanism synchronously enters the extrusion state. This alternating process ensures the continuity of the extrusion of the delivery tube, making the pressure of the spiral extrusion module on the delivery tube gradually change rather than suddenly change, which helps to reduce the elastic rebound of the hose and the resulting negative pressure, thereby reducing pulsation. Moreover, the uniform extrusion force distribution can also reduce the local stress concentration and wear of the hose, thus extending the service life of the hose and reducing the maintenance cost of the peristaltic pump. Generally speaking, the peristaltic pump provided by the present invention effectively solves the problems of pulsation, poor flow stability, and hose wear existing in traditional peristaltic pumps through an innovative spiral extrusion method, has significant beneficial effects, and is applicable to application scenarios with high requirements for flow accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is a schematic structural diagram of an embodiment of the peristaltic pump provided by the present invention;

[0032] Figure 2 It is a schematic structural diagram of another embodiment of the peristaltic pump provided by the present invention;

[0033] Figure 3 It is a schematic structural diagram of an embodiment of the extrusion mechanism provided by the present invention;

[0034] Figure 4 is Figure 3 an enlarged view of part A in

[0035] Explanation of the reference numerals in the drawings:

[0036] 100, Peristaltic pump; 1, Base; 11, Base block; 111, Receiving groove; 12, Accommodating cavity; 13, Outlet; 14, Inlet; 15, Mounting hole; 2, Delivery pipe; 3, Extrusion mechanism; 31, Fixed seat; 311, Fixed bracket; 312, Buffer rubber block; 32, Micro airbag; 321, Airbag wall; 3211, Chamber; 322, R corner; 323, Piston body; 324, Chamfer; 3241, Radius; 3242, Reducing angle.

[0037] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides a peristaltic pump 100.

[0042] Please refer to Figures 1 to 4, in an embodiment of the present invention, the peristaltic pump 100 includes a base 1, a delivery pipe 2, a spiral extrusion module, and a control module. The base 1 is provided with a receiving cavity 12, an outlet 13 and an inlet 14 communicating with the receiving cavity 12; the delivery pipe 2 is arranged in the receiving cavity 12 along a linear direction, and both ends of the delivery pipe 2 extend to the outside of the base 1 from the inlet 14 and the outlet 13 respectively; the spiral extrusion module is arranged in the receiving cavity 12, and the spiral extrusion module includes a plurality of extrusion mechanisms 3, and the plurality of extrusion mechanisms 3 are spirally and closely distributed around the delivery pipe 2 along the direction from the inlet 14 to the outlet 13; each extrusion mechanism 3 has an extrusion state and a relaxation state. In the extrusion state, the extrusion mechanism 3 applies an extrusion force extending radially along the delivery pipe 2 to the delivery pipe 2; in the relaxation state, the extrusion mechanism 3 releases the delivery; the control module is used to control the switching of each extrusion mechanism 3 between the extrusion state and the relaxation state, so that the plurality of extrusion mechanisms 3 sequentially and continuously extrude the delivery pipe 2 from the inlet 14 to the outlet 13 direction to realize the spiral extrusion of the delivery pipe 2.

[0043] The peristaltic pump 100 provided by the present invention realizes a continuous and uniform extrusion effect on the fluid in the delivery pipe 2 by setting a spiral extrusion module to extrude the delivery pipe 2 in a spiral manner, effectively reducing the pulsation during the fluid delivery process and improving the fluid delivery stability. Specifically, the plurality of extrusion mechanisms 3 are spirally and closely distributed along the linear direction of the delivery pipe 2, ensuring that when the extrusion mechanisms 3 act sequentially, a continuous extrusion wave along the length direction of the delivery pipe 2 can be formed. When the peristaltic pump 100 operates, the control module activates each extrusion mechanism 3 in sequence according to a preset program. After receiving the control signal, each extrusion mechanism 3 changes from the relaxation state to the extrusion state and applies a radial extrusion force to the delivery pipe 2. Through sequential activation, after each extrusion mechanism 3 completes the extrusion action, it will return to the relaxation state according to the instruction of the control module. During the process of the previous extrusion mechanism 3 entering the relaxation state, the next extrusion mechanism 3 synchronously enters the extrusion state. This alternating process ensures the continuity of the extrusion of the delivery pipe 2, making the pressure of the spiral extrusion module on the delivery pipe 2 gradually change rather than suddenly change, which helps to reduce the elastic rebound of the hose and the resulting negative pressure, thereby reducing pulsation. Moreover, the uniform extrusion force distribution can also reduce the local stress concentration and wear of the hose, thereby extending the service life of the hose and reducing the maintenance cost of the peristaltic pump 100. Generally speaking, the peristaltic pump 100 provided by the present invention effectively solves the problems of pulsation, poor flow stability, and hose wear existing in the traditional peristaltic pump 100 through an innovative spiral extrusion method, has significant beneficial effects, and is applicable to application scenarios with high requirements for flow accuracy and stability.

[0044] It should be noted that, in order to facilitate the installation of each extrusion mechanism 3, the base 1 can be composed of two base blocks 11 spliced ​​up and down or left and right (installed by lug locking or welding), and each base block 11 is provided with a groove 111 on one side close to each other, and the two grooves 111 together constitute the above-mentioned accommodating chamber 12. Before installing the extrusion mechanism 3, it is necessary to pre-punch a plurality of mounting holes on the groove wall of each groove 111, and the positions of the plurality of mounting holes on the two base blocks 11 are closely distributed in a spiral shape around the delivery pipe 2. It should also be noted that, since the plurality of mounting holes are closely distributed in a spiral shape, in order to facilitate production and manufacturing, the delivery pipe 2 is installed as much as possible in a linear direction during installation.

[0045] In addition, there is no specific setting for the number of extrusion mechanisms 3. It only needs to ensure that they can be closely distributed in a spiral shape along the linear direction of the delivery pipe 2 (here, "closely distributed" means that the contact surfaces of adjacent extrusion mechanisms 3 and the delivery pipe 2 are at least partially overlapped), and can be sequentially and continuously extruded under the precise control of the control module to achieve a spiral extrusion effect. The number of extrusion mechanisms 3 needs to be flexibly adjusted according to the length, diameter and required flow rate of the delivery pipe 2 to obtain the best extrusion effect.

[0046] In one embodiment, the extrusion mechanism 3 includes a fixed seat 31 and a micro air pump. The fixed seat 31 is arranged on the cavity wall of the accommodating cavity 12. An airbag groove is opened on the side of the fixed seat 31 away from the cavity wall of the accommodating cavity 12; the micro air pump includes a pump body, a micro airbag 32 and a solenoid valve. At least part of the structure of the micro airbag 32 is accommodated in the airbag groove. The air outlet of the pump body is connected to the air inlet of the micro airbag 32. The solenoid valve is arranged at the air inlet of the micro airbag 32 and is electrically connected to the control module; wherein the micro airbag 32 has a relaxed state and an extrusion state. In the relaxed state, the micro airbag 32 is spaced apart from the conveying tube 2; in the extrusion state, the micro airbag 32 extrudes the conveying tube 2 along the radial direction of the conveying tube 2. The micro airbag 32 is used to replace the traditional roller or pressure block, and the delivery tube 2 is squeezed by the expansion and contraction of the airbag. This non-mechanical contact method reduces mechanical wear, reduces maintenance costs, and avoids pollution caused by mechanical contact. In addition, the expansion and contraction of the micro airbag 32 is controlled by the solenoid valve, which can achieve precise control of the squeezing force of the delivery tube 2. This control method can reduce fluid pulsation caused by uneven squeezing force and improve the stability of flow.

[0047] In one embodiment, the micro airbag 32 includes an airbag wall 321 and a piston body 323. A cavity 3211 is formed inside the airbag wall 321. There is an R corner at the inner root of the airbag wall 321, and the maximum distance between the center of the R corner and the inner side of the airbag wall 321 is at least three times the wall thickness of the airbag wall 321; the piston body 323 is arranged at the root of the airbag wall 321, and there is a chamfer 324 between the outer root of the airbag wall 321 and the piston body 323. The distance between the connection point of the chamfer 324 and the piston entity and the center of the R corner is at least 0.5 times the wall thickness of the airbag wall 321; the end of the piston body 323 away from the airbag wall 321 is an arc structure for abutting against the delivery pipe 2. The R corner design can reduce the stress concentration when the airbag wall 321 expands. The maximum distance between the center of the R corner and the inner side of the airbag wall 321 is at least three times the wall thickness of the airbag wall 321. Such a design helps to disperse stress, avoid rupture or deformation of the airbag wall 321 under high pressure, thereby improving the durability and reliability of the airbag. Moreover, the chamfer 324 design between the outer root of the airbag wall 321 and the piston body 323 helps for smooth transition and reduces the stress concentration that may occur during the expansion and contraction of the airbag. In addition, the distance between the connection point of the chamfer 324 and the piston entity and the center of the R corner is at least 0.5 times the wall thickness of the airbag wall 321. Such a design can ensure a more stable connection between the airbag and the piston body 323 and reduce the risk of leakage. Thus, under the action of the inner R corner and the outer chamfer 324 of specific sizes, a gap is reserved when the piston entity makes a piston motion, effectively reducing the frictional damage between the piston entity and the airbag wall 321 and between the inner walls after the folding of the cavity 3211 wall, effectively slowing down the life reduction caused by the wear of the airbag wall 321, and at the same time reducing the noise generated during the piston motion. Further, in this embodiment, the end of the piston body 323 away from the airbag wall 321 is an arc structure. This design makes the contact between the piston body 323 and the delivery pipe 2 more uniform, reduces the damage to the delivery pipe 2 caused by excessive local pressure. The arc structure helps to uniformly apply pressure to the delivery pipe 2 when the airbag expands, thereby more effectively promoting fluid flow.

[0048] In one embodiment, the airbag wall 321 includes a straight wall section and a flared section connected to the straight wall section. This structural design helps to form a stable airbag shape while providing sufficient space to accommodate gas, enabling the airbag to expand evenly. The straight wall section provides a stable air intake channel, while the flared section helps the airbag to form a bowl-shaped structure when expanding, which helps to evenly distribute pressure and reduce local compression on the delivery tube 2. Further, one end of the straight wall section away from the flared section is the air inlet of the micro airbag 32, and one end of the flared section away from the straight wall section is connected to the piston body 323. The flared section is in a circular arc configuration or a slanted linear configuration to form a bowl shape. Both of these configurations help to form a bowl-shaped structure, but the slanted linear configuration may provide more direct pressure transmission, while the circular arc configuration may provide a smoother pressure distribution. This design enables the airbag to better adapt to the shape of the delivery tube 2 when expanding, reducing pressure concentration points and thus reducing the risk of damage to the delivery tube 2. In the above structure, correspondingly, the solenoid valve is provided in the straight wall section. The design of the micro airbag 32 in this embodiment improves the performance of the peristaltic pump 100 by optimizing the structure of the airbag wall 321 and the position of the solenoid valve, especially in terms of the uniformity, accuracy of fluid delivery, and the system response speed.

[0049] In one embodiment, the piston body 323 sequentially includes a fluororubber anti-corrosion layer, a Kevlar fiber tensile layer, and a silicone rubber sealing layer from the airbag wall 321 outwards. Fluororubber has excellent chemical corrosion resistance and can resist the erosion of various chemical substances. Kevlar fiber (aramid fiber) has extremely high tensile strength and impact resistance, can withstand high pressure and repeated expansion and contraction, improving the structural stability of the piston body 323. Silicone rubber has good sealing performance, can effectively prevent gas leakage in the maintenance airbag, and is not easily worn when in contact with the delivery tube 2.

[0050] In one embodiment, the chamfer 324 includes a rounded corner 3241 and a reduced corner 3242, and the reduced corner 3242 is in an arc shape or a straight line shape. With such a setting, through the structural settings of the two chamfers 324, the rounded corner 3241 does not need to be particularly large, and the connection between the airbag wall 321 and the piston entity is relatively smooth.

[0051] In one embodiment, the fixed seat 31 includes a fixed bracket 311, a buffer rubber block 312, and a locking member. The fixed bracket 311 is provided on the cavity wall of the accommodation cavity 12. On the side of the fixed bracket 311 facing away from the cavity wall of the accommodation cavity 12, an airbag groove and a first fixing hole penetrating therethrough are provided; the buffer rubber block 312 is provided between the fixed bracket 311 and the cavity wall of the accommodation cavity 12, and the buffer rubber block 312 is provided with a second fixing hole corresponding to the first fixing hole; the locking member passes through the first fixing hole and the second fixing hole, and the locking end of the locking member is locked to the cavity wall of the accommodation cavity 12. Specifically, the fixed bracket 311 is installed on the cavity wall of the accommodation cavity 12, and on the side facing away from the cavity wall, there are an airbag groove and a first fixing hole. Such a design facilitates fixing and adjustment. The buffer rubber block 312 is located between the fixed bracket 311 and the cavity wall, playing a role in shock absorption and protection. At the same time, the second fixing hole provided thereon corresponds to the first fixing hole to ensure that the locking member can pass through smoothly and be fixed. The design of the locking member (screw or bolt) enables it to pass through the first fixing hole and the second fixing hole and tightly combine with the cavity wall of the accommodation cavity 12 at the locking end, thus achieving a firm fixing effect. This structure not only improves the stability of the fixing but also can effectively absorb external impact forces to protect the internal components from damage. Overall, the design of the fixed seat 31 takes into account both practicality and safety and is suitable for a variety of application scenarios.

[0052] In one embodiment, the extrusion mechanism 3 includes a micro motor, a mounting disk, and a jacking rod. The mounting disk is provided on the cavity wall of the accommodation cavity 12, the micro motor is provided on the mounting disk, the driving end of the micro motor is drivingly connected to the jacking rod, and the jacking rod is used to abut against the conveying pipe 2 to apply a radial extrusion force to the conveying pipe 2. Provide sufficient power when. The role of the mounting disk is to provide a stable mounting base for the micro motor to ensure that the motor does not displace or vibrate during operation, thus ensuring the stability of the extrusion process. The jacking rod is connected to the micro motor through the driving end of the micro motor and is responsible for converting the rotational motion of the motor into linear motion. The other end of the jacking rod abuts against the conveying pipe 2 and can apply a radial extrusion force to the conveying pipe 2. Through this structure, the rotation of the micro motor can drive the jacking rod to move up and down, thereby realizing the extrusion of the conveying pipe 2. The extrusion mechanism 3 can adjust the magnitude of the extrusion force as needed to adapt to different working conditions and ensure good sealing and stability of the conveying pipe 2 during the conveying process.

[0053] In one embodiment, the extrusion mechanism 3 further includes an elastic reset member, which is connected to the mounting disk and the jacking rod, and the elastic deformation amount increases during the process of the jacking rod approaching the conveying pipe 2. In this way, when the jacking rod approaches the conveying pipe 2, the elastic reset member will generate an increase in the elastic deformation amount due to the movement of the jacking rod, thereby storing energy. After the jacking rod completes its work, the elastic reset member will release the stored energy, prompting the jacking rod to return to its initial position. This design not only improves the working efficiency of the extrusion mechanism 3, but also effectively reduces the wear of mechanical components and prolongs the service life of the equipment. At the same time, the presence of the elastic reset member can also ensure the stability and safety of the extrusion mechanism 3 during operation.

[0054] The present invention also provides a medical device, which includes a peristaltic pump 100. The specific structure of the peristaltic pump 100 refers to the above embodiments. Since this medical device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0055] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A peristaltic pump, characterized in that: include: A base, wherein the base is provided with a receiving cavity and an outlet and an inlet communicated with the receiving cavity; A delivery pipe, the delivery pipe is arranged in the accommodating cavity along a linear direction, and two ends of the delivery pipe extend from the inlet and the outlet to the outside of the base respectively; A spiral extrusion module, the spiral extrusion module is arranged in the accommodating chamber, the spiral extrusion module includes a plurality of extrusion mechanisms, the plurality of extrusion mechanisms are closely distributed in a spiral shape around the delivery pipe along the direction from the inlet to the outlet; each of the extrusion mechanisms has an extrusion state and a relaxation state, in which the extrusion mechanism applies an extrusion force extending radially along the delivery pipe to the delivery pipe; in the relaxation state, the extrusion mechanism releases the delivery pipe; and, A control module, the control module is used to control the switching of each of the extrusion mechanisms between the extrusion state and the relaxation state, so that the multiple extrusion mechanisms sequentially and continuously extrude the delivery tube in a direction from the inlet to the outlet, so as to achieve spiral extrusion of the delivery tube; There is at least an overlapping area between the contact surfaces of two adjacent extrusion mechanisms and the conveying pipe; The extrusion mechanism comprises: A fixing seat, the fixing seat is arranged on the cavity wall of the accommodating cavity, and an airbag groove is provided on a side of the fixing seat away from the cavity wall of the accommodating cavity; and, A micro air pump, the micro air pump comprising a pump body, a micro airbag and a solenoid valve, the micro airbag at least part of its structure is accommodated in the airbag groove, the air outlet of the pump body is connected to the air inlet of the micro airbag, the solenoid valve is arranged at the air inlet of the micro airbag and is electrically connected to the control module; In the relaxed state, the micro airbag is spaced apart from the delivery tube; in the squeezed state, the micro airbag squeezes the delivery tube along the radial direction of the delivery tube.

2. The peristaltic pump according to claim 1, characterized in that The micro airbag comprises: An airbag wall, wherein a cavity is formed inside the airbag wall, an R angle is formed at the root of the inner side of the airbag wall, and the maximum distance between the center of the R angle and the inner side of the airbag wall is at least 3 times the thickness of the airbag wall; A piston body, wherein the piston body is arranged at the root of the airbag wall, a chamfer is provided at the transition between the outer root of the airbag wall and the piston body, and the distance between the connection point of the chamfer and the piston entity and the center of the R angle is at least 0.5 times the thickness of the airbag wall; the end of the piston body away from the airbag wall is an arc structure, which is used to abut against the delivery tube.

3. The peristaltic pump according to claim 2, characterized in that The airbag wall includes a straight wall section and a flared section connected to the straight wall section, one end of the straight wall section away from the flared section is an air inlet of the micro airbag, one end of the flared section away from the straight wall section is connected to the piston body, and the flared section is in an arc shape or an oblique line shape to form a bowl shape; The solenoid valve is arranged on the straight wall section.

4. The peristaltic pump according to claim 2, characterized in that The piston body comprises a fluororubber anti-corrosion layer, a Kevlar fiber tensile layer and a silicone sealing layer in sequence from the airbag wall to the outside.

5. The peristaltic pump according to claim 2, characterized in that The chamfers include rounded corners and reduced corners, and the reduced corners are in arc shape or straight line shape.

6. The peristaltic pump according to claim 1, characterized in that The fixing seat comprises: A fixing bracket, the fixing bracket being arranged on the cavity wall of the accommodating cavity, and the fixing bracket having an airbag groove and a first fixing hole extending therethrough on a side of the cavity wall away from the accommodating cavity; A buffer rubber block, the buffer rubber block is arranged between the fixing bracket and the cavity wall of the accommodating cavity, and the buffer rubber block is provided with a second fixing hole corresponding to the first fixing hole; A locking piece, wherein the locking piece is passed through the first fixing hole and the second fixing hole, and a locking end of the locking piece is locked to the cavity wall of the accommodating cavity.

7. The peristaltic pump according to claim 1, characterized in that The extrusion mechanism includes a micro motor, a mounting plate and a lifting rod. The mounting plate is arranged on the cavity wall of the accommodating cavity, the micro motor is arranged on the mounting plate, the driving end of the micro motor is transmission-connected to the lifting rod, and the lifting rod is used to abut against the conveying pipe to apply radial extrusion force to the conveying pipe.

8. The peristaltic pump according to claim 7, characterized in that The extrusion mechanism further comprises an elastic reset member, which connects the mounting plate and the lifting rod and whose elastic deformation increases when the lifting rod approaches the conveying pipe.

9. A medical device, characterized in that: The medical device comprises a peristaltic pump as claimed in any one of claims 1 to 8.

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