Peristaltic pump and medical equipment

Abstract

The invention discloses a peristaltic pump and medical equipment, and relates to the technical field of peristaltic pumps, the peristaltic pump comprises a base, a conveying pipe, a spiral extrusion module and a control module, the base is provided with a containing cavity, an outlet and an inlet, and the outlet and the inlet are communicated with the containing cavity; the conveying pipe is arranged in the containing cavity in the linear direction, and the two ends of the conveying pipe extend out of the base from the inlet and the outlet correspondingly. The spiral extrusion module is arranged in the containing cavity and comprises a plurality of extrusion mechanisms, and the multiple extrusion mechanisms are spirally and tightly distributed around the conveying pipe in the direction from the inlet to the outlet. In the extrusion state, the extrusion mechanism applies extrusion force extending in the radial direction of the conveying pipe to the conveying pipe; the control module is used for controlling the extrusion mechanisms to be switched between the extrusion state and the loosening state, so that the multiple extrusion mechanisms sequentially and continuously extrude the conveying pipe in the direction from the inlet to the outlet, and spiral extrusion of the conveying pipe is achieved. The invention aims to improve the flow stability and the conveying precision of the peristaltic pump.

Description

Technical Field

[0001] The invention relates to the technical field of peristaltic pumps, and in particular to a peristaltic pump and medical equipment. Background Art

[0002] A peristaltic pump is a positive displacement pump that delivers fluid by periodically compressing a flexible hose. Its working principle imitates the peristaltic motion of the biological digestive tract. When an external mechanical element (such as a roller or a pressure block) applies local extrusion to the hose, a closed chamber is formed inside the hose and moves in 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, and easy cleaning. It 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. Take the mainstream roller peristaltic pump as an example: the hose is fixed in the arc-shaped pump groove, and the motor drives the rotor to drive 2-6 rollers to rotate continuously. The rollers roll over the hose in turn to produce an extrusion wave. Another common solution is the linear pressure block peristaltic pump, which uses a cylinder or cam to push the pressure block sequence for alternating compression. Both types of structures rely on the mechanical contact extrusion of the hose by rigid elements to achieve fluid propulsion through physical deformation.

[0004] However, under the intermittent extrusion mechanism of traditional peristaltic pumps, the roller or pressure block will cause the elastic rebound of the hose at the moment of releasing the hose, causing local negative pressure and reverse flow of the fluid. This pulsation not only affects the stability of the flow, but may also have an adverse effect on certain flow-sensitive applications (such as precision chemical metering, trace drug delivery, etc.). Summary of the invention

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

[0006] To achieve the above object, the present invention provides a peristaltic pump, comprising: 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; and, A 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 realize spiral extrusion of the delivery tube.

[0007] In one embodiment, the extrusion mechanism comprises: A fixing seat, the fixing seat being arranged on the cavity wall of the accommodating cavity, and an airbag groove being arranged 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.

[0008] In one embodiment, 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.

[0009] 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 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.

[0010] In one embodiment, the piston body includes a fluororubber anti-corrosion layer, a Kevlar fiber tensile layer and a silicone sealing layer in sequence from the airbag wall to the outside.

[0011] In one embodiment, the chamfer includes a rounded corner and a reduced corner, and the reduced corner is in an arc shape or a straight line shape.

[0012] In one embodiment, the fixing base 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.

[0013] In one embodiment, the extrusion mechanism includes a micro motor, a mounting plate and a lifting rod, wherein the mounting plate is disposed on the cavity wall of the accommodating cavity, the micro motor is disposed 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 tube to apply radial extrusion force to the conveying tube.

[0014] In one embodiment, the extrusion mechanism further includes an elastic reset member, which connects the mounting plate and the lifting rod and increases its elastic deformation amount when the lifting rod approaches the conveying pipe.

[0015] The present invention also provides a medical device, comprising the peristaltic pump as described above.

[0016] The peristaltic pump provided by the present invention realizes a continuous and uniform extrusion effect on the fluid in the delivery tube by arranging a spiral extrusion module to spirally extrude the delivery tube, effectively reduces pulsation during fluid delivery, and improves the delivery stability of the fluid. Specifically, multiple extrusion mechanisms are closely 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 can be formed along the length direction of the delivery tube. When the peristaltic pump is operating, the control module activates each extrusion mechanism in sequence according to a preset program. After receiving the control signal, each extrusion mechanism changes from a relaxed state to an extrusion state, applying a radial extrusion force to the delivery tube. Through sequential activation, each extrusion mechanism will return to a relaxed state according to the instruction of the control module after completing the extrusion action. While the previous extrusion mechanism enters the relaxed state, the next extrusion mechanism enters the extrusion state synchronously. This alternating process ensures the continuity of the delivery tube extrusion, so that the pressure of the spiral extrusion module on the delivery tube is gradual rather than sudden, which helps to reduce the elastic rebound of the hose and the resulting negative pressure, thereby reducing pulsation, and the uniform extrusion force distribution can also reduce 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. In general, 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. It has significant beneficial effects and is suitable for application scenarios with high requirements on flow accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a peristaltic pump provided by the present invention; Figure 2 A schematic structural diagram of another embodiment of the peristaltic pump provided by the present invention; Figure 3 A schematic structural diagram of an embodiment of an extrusion mechanism provided by the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] Description of Figure Numbers: 100. Peristaltic pump; 1. Base; 11. Base block; 111. Receptacle; 12. Receptacle 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. Airbag cavity; 322. R angle; 323. Piston body; 324. Chamfer; 3241. Rounded corner; 3242. Reduced corner.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The present invention provides a peristaltic pump 100 .

[0025] See also Figures 1 to 4In one embodiment of the present invention, the peristaltic pump 100 includes a base 1, a delivery tube 2, a spiral extrusion module and a control module. The base 1 is provided with a receiving chamber 12 and an outlet 13 and an inlet 14 connected to the receiving chamber 12; the delivery tube 2 is arranged in the receiving chamber 12 along a linear direction, and the two ends of the delivery tube 2 extend from the inlet 14 and the outlet 13 to the outside of the base 1 respectively; the spiral extrusion module is arranged in the receiving chamber 12, and the spiral extrusion module includes a plurality of extrusion mechanisms 3, and the plurality of extrusion mechanisms 3 are closely distributed in a spiral shape around the delivery tube 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 which the extrusion mechanism 3 applies an extrusion force extending along the radial direction of the delivery tube 2 to the delivery tube 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 tube 2 from the inlet 14 to the outlet 13 to realize the spiral extrusion of the delivery tube 2.

[0026] The peristaltic pump 100 provided by the present invention realizes a continuous and uniform extrusion effect on the fluid in the delivery tube 2 by providing a spiral extrusion module to spirally extrude the delivery tube 2, effectively reduces pulsation during fluid delivery, and improves the delivery stability of the fluid. Specifically, multiple extrusion mechanisms 3 are closely distributed in a spiral shape along the linear direction of the delivery tube 2, ensuring that when the extrusion mechanisms 3 act in sequence, a continuous extrusion wave can be formed along the length direction of the delivery tube 2. When the peristaltic pump 100 is in operation, 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 a relaxed state to an extrusion state, and applies a radial extrusion force to the delivery tube 2. Through sequential activation, each extrusion mechanism 3 will return to a relaxed state according to the instruction of the control module after completing the extrusion action. While the previous extrusion mechanism 3 enters the relaxed state, the next extrusion mechanism 3 enters the extrusion state synchronously. This alternating process ensures the continuity of the extrusion of the delivery tube 2, so that the pressure of the spiral extrusion module on the delivery tube 2 is gradual rather than sudden, which helps to reduce the elastic rebound of the hose and the resulting negative pressure, thereby reducing pulsation, and the uniform extrusion force distribution can also reduce 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. In general, 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 suitable for application scenarios with high requirements on flow accuracy and stability.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In one embodiment, the micro airbag 32 includes an airbag wall 321 and a piston body 323. The airbag wall 321 has a cavity 3211 formed therein. The inner root of the airbag wall 321 has an R angle transition. The maximum distance between the center of the R angle and the inner side of the airbag wall 321 is at least 3 times the wall thickness of the airbag wall 321. The piston body 323 is arranged at the root of the airbag wall 321. The outer root of the airbag wall 321 and the piston body have a chamfer 324 transition. The distance between the connection point between the chamfer 324 and the piston entity and the center of the R angle 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 contacting with the delivery tube 2. The R angle design can reduce the stress concentration of the airbag wall 321 when it expands. The maximum distance between the center of the R angle and the inner side of the airbag wall 321 is at least 3 times the wall thickness of the airbag wall 321. Such a design helps to disperse stress and prevent the airbag wall 321 from rupturing or deforming under high pressure, thereby improving the durability and reliability of the airbag. The chamfer 324 design between the outer root of the airbag wall 321 and the piston body 323 helps to make a smooth transition and reduce the stress concentration that may be generated 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 angle is at least 0.5 times the wall thickness of the airbag wall 321. Such a design can ensure that the connection between the airbag and the piston body 323 is more stable and reduce the risk of leakage. In this way, under the action of the inner R angle and the outer chamfer 324 of a specific size, a gap is reserved when the piston entity is in piston motion, effectively reducing the friction damage between the piston entity and the airbag wall 321 and between the inner walls of the sac cavity 3211 after the wall is folded, effectively slowing down the reduction in life caused by the wear of the airbag wall 321, and reducing the noise generated during the piston motion. Furthermore, in this embodiment, the end of the piston body 323 away from the airbag wall 321 is an arc-shaped structure. This design makes the contact between the piston body 323 and the delivery tube 2 more uniform, reducing damage to the delivery tube 2 caused by excessive local pressure. The arc-shaped structure helps to evenly apply pressure to the delivery tube 2 when the airbag is inflated, thereby more effectively promoting the flow of fluid.

[0031] 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 and provides enough space to accommodate gas so that the airbag can expand evenly. The straight wall section provides a stable air inlet 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 pressure on the delivery tube 2. Further, the end of the straight wall section away from the flared section is the air inlet of the micro airbag 32, and the end of the flared section away from the straight wall section is connected to the piston body 323. The flared section is an arc-shaped structure or an oblique line structure to form a bowl shape. Both structures help to form a bowl-shaped structure, but the oblique line structure may provide more direct pressure transmission, while the arc-shaped structure may provide a smoother pressure distribution. This design enables the airbag to better adapt to the shape of the delivery tube 2 when expanding, reduce the pressure concentration point, and thus reduce the risk of damage to the delivery tube 2. In the above structure, correspondingly, the solenoid valve is arranged in the straight wall section. The design of the micro airbag 32 in this embodiment improves the performance of the peristaltic pump 100, especially in terms of uniformity, accuracy and system response speed of fluid delivery, by optimizing the structure of the airbag wall 321 and the position of the solenoid valve.

[0032] In one embodiment, the piston body 323 includes a fluororubber anti-corrosion layer, a Kevlar fiber tensile layer, and a silicone sealing layer in order from the airbag wall 321 to the outside. Fluororubber has excellent chemical corrosion resistance and can resist the erosion of various chemical substances, while Kevlar fiber (aramid fiber) has extremely high tensile strength and impact resistance, can withstand high pressure and repeated expansion and contraction, and improve the structural stability of the piston body 323. Silicone has good sealing performance and can effectively prevent gas leakage in the maintenance airbag, and is not easy to wear when the silicone contacts the delivery pipe 2.

[0033] In one embodiment, the chamfer 324 includes a rounded corner 3241 and a reduced corner 3242, and the reduced corner 3242 is arc-shaped or linear. In this way, through the structural arrangement 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.

[0034] In one embodiment, the fixing seat 31 includes a fixing bracket 311, a buffer rubber block 312 and a locking member. The fixing bracket 311 is arranged on the cavity wall of the accommodating cavity 12, and the side of the fixing bracket 311 away from the cavity wall of the accommodating cavity 12 is provided with an airbag groove and a first fixing hole provided therethrough; the buffer rubber block 312 is arranged between the fixing bracket 311 and the cavity wall of the accommodating cavity 12, and the buffer rubber block 312 is provided with a second fixing hole corresponding to the first fixing hole; the locking member is penetrated 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 accommodating cavity 12. Specifically, the fixing bracket 311 is installed on the cavity wall of the accommodating cavity 12, and the side of the fixing bracket 311 away from the cavity wall is provided with an airbag groove and a first fixing hole, and such a design can be conveniently fixed and adjusted. The buffer rubber block 312 is located between the fixing bracket 311 and the cavity wall, and plays a role in shock absorption and protection. At the same time, the second fixing hole provided thereon corresponds to the first fixing hole, ensuring that the locking member can pass through and be fixed smoothly. The design of the locking member (screw or bolt) enables it to pass through the first fixing hole and the second fixing hole, and to be tightly combined with the cavity wall of the accommodating cavity 12 at the locking end, thereby achieving a firm fixing effect. This structure not only improves the stability of the fixation, but also effectively absorbs external impact force and protects the internal components from damage. Overall, the design of the fixing seat 31 takes into account both practicality and safety, and is suitable for a variety of application scenarios.

[0035] In one embodiment, the extrusion mechanism 3 includes a micro motor, a mounting plate and a lifting rod. The mounting plate is arranged on the cavity wall of the accommodating cavity 12, the micro motor is arranged on the mounting plate, the driving end of the micro motor is connected to the lifting rod, and the lifting rod is used to abut against the conveying pipe 2 to apply radial extrusion force to the conveying pipe 2. Provide sufficient power when the extrusion mechanism 3 is in operation. The function of the mounting plate is to provide a stable installation foundation for the micro motor to ensure that the motor will not be displaced or vibrated during operation, thereby ensuring the stability of the extrusion process. The lifting 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 lifting rod abuts against the conveying pipe 2 and can apply radial extrusion force to the conveying pipe 2. Through this structure, the rotation of the micro motor can drive the lifting rod to move up and down, thereby realizing the extrusion of the conveying pipe 2. The extrusion mechanism 3 can adjust the size of the extrusion force as needed, adapt to different working conditions, and ensure that the conveying pipe 2 maintains good sealing and stability during the conveying process.

[0036] In one embodiment, the extrusion mechanism 3 also includes an elastic reset member, which connects the mounting plate and the lifting rod, and increases in elastic deformation when the lifting rod approaches the conveying pipe 2. In this way, when the lifting rod approaches the conveying pipe 2, the elastic reset member will increase in elastic deformation due to the movement of the lifting rod, thereby storing energy. After the lifting rod completes its work, the elastic reset member will release the stored energy, prompting the lifting 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 parts and extends the service life of the equipment. At the same time, the presence of the elastic reset member can also ensure that the extrusion mechanism 3 maintains stability and safety during operation.

[0037] 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 embodiment. Since the medical device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0038] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied 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; and, A 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 conveying tube in a direction from the inlet to the outlet, so as to realize spiral extrusion of the conveying tube.

2. The peristaltic pump according to claim 1, characterized in that The extrusion mechanism comprises: A fixing seat, the fixing seat being arranged on the cavity wall of the accommodating cavity, and an airbag groove being arranged 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.

3. The peristaltic pump according to claim 2, 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.

4. The peristaltic pump according to claim 3, 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.

5. The peristaltic pump according to claim 3, 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.

6. The peristaltic pump according to claim 3, characterized in that The chamfers include rounded corners and reduced corners, and the reduced corners are in arc shape or straight line shape.

7. The peristaltic pump according to claim 2, 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.

8. 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.

9. The peristaltic pump according to claim 8, 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.

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

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