CN211986534U - Infusion pump - Google Patents

Abstract

The application discloses transfer pump, it includes: a pump body having a casing provided with a pipe groove; a pump door lockably and openably mounted to the pump main body; the pump door is provided with a pressure pipe block; wherein the pump main part includes: a drive device; the cam shaft is connected with the driving device, and a plurality of cam mechanisms which are distributed along the axial direction of the cam shaft are arranged on the cam shaft; the pump piece group, correspond to set up in the pipe chase and with press the pipe piece to set up in opposite directions for with press pipe piece cooperation extrusion transfer line, pump piece group includes a plurality of pump pieces of arranging along the camshaft axial, every pump piece is connected with the cam mechanism one-to-one transmission, cam mechanism drive pump piece group's pump piece is linear motion reciprocating in proper order, the extrusion end terminal surface of pump piece outwards is in proper order for ending liquid section, concora crush section and bounce-back section by the centre, ends liquid section, concora crush section and bounce-back section and reduces in proper order the extrusion degree of pipe is pressed to the transmission. Because the pipe wall extruded by the rebound section keeps the original elasticity, the pipe wall can rebound quickly, and the pipe wall corresponding to the flat pressing section and the liquid stopping section is pulled to recover, thereby avoiding the fatigue of the infusion pipe.

Description

Infusion pump

Technical Field

The utility model relates to the technical field of medical machinery, in particular to transfer pump.

Background

The infusion pump is a common medical appliance, and the infusion tube is repeatedly extruded in a continuous peristaltic manner through the pump sheet, so that the liquid conveying in the infusion tube and the accurate control of the infusion amount are realized; however, the existing infusion tube is easy to generate fatigue in the process of repeated extrusion, thereby causing the problems of inaccurate infusion amount and the like.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides an infusion pump to realize more accurate infusion control.

The embodiment of the utility model provides an infusion pump, which is used for matching with an infusion tube, and comprises a pump main body and a pump door; a shell of the pump main body is provided with a pipe groove for placing an infusion pipe; the pump door is installed on the pump body in a lockable and openable manner; a pressure pipe block is arranged on the pump door; the pump main body comprises a driving device, a cam shaft, a cam mechanism and a pump sheet set; the driving device is arranged in the shell; the camshaft is in driving connection with the driving device and is provided with a plurality of cam mechanisms which are distributed along the axial direction of the camshaft; the pipe pressing block is correspondingly arranged at the position of the pipe groove; the pump piece group corresponds and sets up in the pipe box and with press the pipe piece to set up in opposite directions for with press pipe piece cooperation extrusion transfer line, pump piece group is including a plurality of pump pieces of arranging along the axial of camshaft, every pump piece is connected with the cam mechanism one-to-one transmission, cam mechanism drive pump piece group's pump piece linear motion reciprocally, the extrusion end terminal surface of pump piece is along middle outside orientation in proper order for ending liquid section, concora crush section and bounce-back section homogeneous phase are to ending liquid section symmetrical arrangement, end liquid section, concora crush section and bounce-back section reduce in proper order the degree of extrusion of transfer line.

When the infusion pump works, the driving device drives the cam shaft to rotate, the cam shaft rotates to drive the cam mechanisms to do eccentric reciprocating movement, and then the pump sheets of the pump sheet group are driven to sequentially reciprocate to linearly move, and the pump sheets and the pressure pipe blocks are matched to sequentially extrude and release the pipe wall of the infusion pipe, so that liquid in the infusion pipe is driven to continuously and directionally flow. The liquid stopping section of the extrusion end of the pump piece of the infusion pump, the extrusion degree of concora crush section and rebound section to the transfer line reduces in proper order, therefore, extrude the transfer line through the liquid stopping section and end the liquid, liquid in the transfer line is arranged through the concora crush section and is driven, great transfusion volume has been kept, because the rebound section is little to the extrusion degree of transfer line, therefore, the pipe wall that the rebound section corresponds can keep original elasticity, when the pipe wall of pump piece release transfer line, the pipe wall that the rebound section corresponds is kick-backed fast under original elastic effect, and can pull the pipe wall that concora crush section and end the correspondence of liquid section and resume the original shape as far as possible, avoid the transfer line fatigue, the infusion precision of transfer line has been kept, accurate ground infusion control has been realized.

Drawings

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

Fig. 1 is a schematic top view of an infusion pump according to an embodiment of the present invention;

fig. 2 is a schematic top view of a pump sheet of an infusion pump according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pump sheet of an infusion pump according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a cam mechanism of an infusion pump according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a pump sheet frame of an infusion pump according to an embodiment of the present invention.

Wherein, 1 is an infusion tube, 2 is a pump sheet, 21 is a liquid stopping section, 22 is a flat pressing section, 23 is a rebounding section, 24 is a U-shaped groove, 25 is a second guide structure, 26 is a second limit structure, 3 is a tube pressing block, 4 is a cam mechanism, 41 is an eccentric wheel, 42 is a connecting rod part, 5 is a driving device, 51 is a power part, 52 is a transmission component, 6 is a shell, 7 is a pump sheet supporting frame, 71 is a buckle, and 8 is a waterproof film.

Detailed Description

The core of the utility model is to provide an infusion pump, which realizes more accurate infusion control.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, an embodiment of the present invention provides an infusion pump, the infusion pump is used in cooperation with an infusion tube 1, the infusion pump includes a pump main body and a pump door, wherein a casing 6 of the pump main body is provided with a tube slot for placing the infusion tube 1; the pump door is installed on the pump body in a lockable and openable manner; the pump door is provided with a pressure pipe block 3.

The pump main body comprises a driving device 5, a cam shaft, a cam mechanism 4 and a pump sheet group; the driving device 5 is arranged in the shell 6; the camshaft is in driving connection with a driving device 5, and a plurality of cam mechanisms 4 which are distributed along the axial direction of the camshaft are arranged on the camshaft; the pump piece group corresponds and sets up in the pipe box and with press pipe 3 to face the setting mutually for with 3 cooperation extrusion transfer lines of pressure pipe 1, pump piece group includes a plurality of pump pieces 2 of arranging along the axial of camshaft, every pump piece 2 is connected with the 4 one-to-one transmission of cam mechanism, cam mechanism 4 drive pump piece 2 of pump piece group straight line motion reciprocally in proper order, the extrusion end terminal surface of pump piece 2 is in proper order for ending liquid section 21, concora crush section 22 and bounce-back section 23 along middle outside direction, concora crush section 22 and bounce-back section 23 are all to ending liquid section 21 symmetrical arrangement, end liquid section 21, concora crush section 22 and bounce-back section 23 reduce in proper order to the extrusion degree of transfer line 1.

When the infusion pump works, the driving device 5 drives the cam shaft to rotate, the cam shaft rotates to drive the cam mechanisms 4 to do eccentric reciprocating movement, and then the pump sheets 2 of the pump sheet group are driven to sequentially reciprocate to linearly move, and the pump sheets and the pressure pipe blocks 3 are matched to sequentially extrude and release the pipe wall of the infusion pipe 1, so that liquid in the infusion pipe 1 is driven to continuously and directionally flow.

The extrusion end of the pump sheet of the existing infusion pump is generally in a round head structure, a flat head and edge structure and a pure flat head structure. Wherein, the pump piece of button head structure is very big to the squeeze face of transfer line, needs great pressure tube power just can end liquid, is unfavorable for ending liquid, and infusion pump volume is little, and long-time work is squeezed into the slice to the transfer line easily, resumes not to the pipe form to make the infusion volume descend fast, the precision is inaccurate. The pump sheet with the flat head and edge structure is provided with an edge liquid stopping section in the middle and flat pressing sections on two sides of the edge liquid stopping section, the edge liquid stopping section is favorable for stopping liquid, large infusion pump amount can be realized, and pipe fatigue is easily caused by long-time compression of the flat pressing sections on an infusion pipe. The pure flat head structure can realize larger transfusion amount, but is not beneficial to stopping liquid and is easy to cause pipe fatigue.

And the pump piece 2 of transfer pump in this application reduces in proper order because the extrusion degree of the liquid stopping section 21 of extrusion end, concora crush section 22 and bounce-back section 23 to transfer line 1, therefore, extrude liquid stopping to transfer line 1 through liquid stopping section 21, the liquid in transfer line 1 is crowded the drive through concora crush section 22, great transfusion volume has been kept, because bounce-back section 23 is little to the extrusion degree of transfer line 1, therefore, the pipe wall that bounce-back section 23 corresponds can keep original elasticity, when pump piece 2 releases the pipe wall of transfer line 1, the pipe wall that bounce-back section 23 corresponds rebounds back fast under the effect of original elasticity, and can drag the pipe wall that concora crush section 22 and bounce-back section 21 correspond to resume original shape as far as possible, avoid transfer line 1 fatigue deformation, infusion precision of 1 has been kept, infusion control has realized accurately.

In some embodiments, the pump sheets 2 of the pump sheet group reciprocate in a waveform, that is, the shape formed by the arrangement of the end faces of the extrusion ends of all the pump sheets 2 of the pump sheet group is a waveform, and the pump sheets directionally creep in the waveform to realize that the liquid in the infusion tube 1 is extruded and pushed, and the pump sheets 2 reciprocate in a waveform to realize the continuous quantitative delivery of the liquid in the infusion tube 1. Preferably, the waveform is a trigonometric function waveform such as a sine wave or a cosine wave.

In some embodiments, as shown in fig. 2 and 3, the liquid stopping section 21 is optimized, the liquid stopping section 21 is a strip-shaped prismatic structure, the top surface of the strip-shaped prismatic structure is a convex arc surface or a plane or a pointed top, the strip-shaped prismatic structure protrudes out of the end surface of the extrusion end, the infusion tube 1 is firstly extruded, and the area of the strip-shaped prismatic structure extruding the infusion tube 1 is small, so that the strip-shaped prismatic structure can completely seal the internal channel of the infusion tube 1 under small pressure, thereby being beneficial to stopping the liquid of the infusion tube 1 and preventing the liquid in the infusion tube 1 from moving reversely. The top surface of the strip-shaped prismatic structure is preferably a convex arc surface, and due to the arc surface, the liquid stopping is ensured, and meanwhile, the pipe wall of the infusion pipe 1 is prevented from being extruded and damaged.

In some of these embodiments, the radius of the convex arc surface of the strip-shaped edge mounting structure is less than or equal to 0.5 mm. If the radius of the convex cambered surface is too large, the contact extrusion area of the convex cambered surface and the infusion tube 1 is too large, and the required pressure is larger, the liquid stopping is not facilitated.

In some embodiments, such as the specific structure of the platen 22 shown in fig. 2 and 3, the top surface of the platen 22 is parallel to the plane of the platen block 3, and thus, the top surface of the platen 22 and the top surface of the liquid stop 21 have a stable height difference. When the flat pressing section 22 presses the tube wall of the infusion tube 1, the tube wall corresponding to the flat pressing section 22 is tightly attached to the plane, the pressing force of the flat pressing section 22 on the tube wall is smaller than the pressing force of the liquid stopping section 21, the flat pressing section 22 presses and discharges the liquid in the area, and the liquid amount in the area is the pump liquid amount. The use of a flat top for the platen 22 ensures a large amount of pumping fluid.

In some embodiments, the height difference between the top surface of the flat pressing section 22 and the top surface of the liquid stopping section 21 is less than or equal to 0.6mm, so as to ensure that the tube wall extruded by the flat pressing section 22 can be tightly attached, and the extrusion force of the liquid stopping section 21 on the tube wall of the infusion tube 1 is not too large, thereby avoiding rebound failure or damage of the infusion tube 1.

The flat pressing section 22 may have other structural forms besides the above structure, in some embodiments, when the joint of the flat pressing section 22 and the liquid stopping section 21 is in transition through an inner concave arc, and the joint of the flat pressing section 22 and the rebounding section 23 is in transition through an outer convex arc, the flat pressing section 22 may also be a tangent point where the inner concave arc and the outer convex arc are tangent, that is, the flat pressing section 22 directly consists of the inner concave arc and the outer convex arc which are connected, and the flat pressing section 22 can also extrude the pipe wall to pump liquid. The adjacent sections are in transitional connection through the concave arcs and the convex arcs, so that extrusion damage to the pipe wall caused by the outer corners of the joints of the adjacent sections is avoided, and inaccurate pump liquid amount caused by the fact that the inner corners cannot extrude the pipe wall.

In some of these embodiments, the rebound section 23 is optimized as shown in fig. 2 and 3, with the rebound section 23 being inclined to the slope of the block 3 or parallel to the plane or curved surface of the block 3. If the pipe wall is an inclined plane or an arc surface, the outer side of the flat pressing section 22 is equivalently provided with a plane chamfer or an arc chamfer structure so as to reduce the extrusion of the rebound section 23 on the pipe wall, keep the recovery elasticity of the pipe wall, and pull the pipe wall corresponding to the flat pressing section 22 and the liquid stopping section 21 to rebound by utilizing the rebound elasticity of the pipe wall corresponding to the rebound section 23. If the rebound section 23 is parallel to the plane of the pressing pipe block 3, the height difference exists between the rebound section 23 and the flat pressing section 22, a step structure is formed, and the extrusion force on the pipe wall can be reduced.

In some embodiments, the inclined rebound section 23 is adopted, and the inclined angle of the inclined plane relative to the pipe pressing block 3 is 30-60 degrees, which is beneficial to rebound of the pipe wall extruded by the rebound section 23.

In some of the embodiments, the liquid-stopping section 21, the flat pressing section 22 and the rebounding section 23 each have a width of 20% to 50% of the total width of the end face of the extrusion end. As optimization, the liquid stopping section 21, the flat pressing section 22 and the rebounding section 23 are equal in width, and the end faces of the extruding ends are trisected, so that large liquid pumping amount is guaranteed, the pipe wall can be rebounded quickly, the phenomenon that an infusion pipe is fatigued too quickly is avoided, and liquid pumping accuracy is improved. Of course, the width of the flat pressing section 22 in other suitable proportion is selected according to the requirement of the liquid pumping amount, as long as the pipe wall can be ensured to rebound.

In some embodiments, as shown in fig. 3-5, the pump blade 2 is further optimized, the pump blade 2 is a U-shaped body having a U-shaped slot 24, and the driving end of the cam mechanism 4 is detachably and rotatably engaged in the U-shaped slot 24 of the U-shaped body. The driving end of the cam mechanism 4 and the pump piece 2 can be quickly plugged and pulled out for assembly and separation, so that the pump piece 2 is convenient to disassemble and assemble. Because the drive end of the cam mechanism 4 rotates relatively to the pump blade 2 in the reciprocating process, the drive end of the cam mechanism 4 is rotationally clamped with the arc-shaped clamping groove arranged at the bottom of the U-shaped groove 24.

In some embodiments, as shown in fig. 4-5, a pump blade supporting frame 7 is detachably disposed at the pipe slot of the housing 6, the pump blade supporting frame 7 is provided with a rectangular through hole, the pump blade group is reciprocally disposed in the rectangular through hole of the pump blade supporting frame 7, a plurality of first guiding structures are disposed in the pump blade supporting frame 7, each pump blade 2 is also provided with a second guiding structure 25 matched with the first guiding structure, the second guiding structure 25 of each pump blade 2 is matched with each first guiding structure in the pump blade supporting frame 7 in a one-to-one correspondence manner, and the guiding directions of the first and second guiding structures 25 are the reciprocating directions of the pump blade 2, through the cooperation of first guide structure and second guide structure 25 make every pump piece 2 remove along reciprocating motion direction, avoid pump piece 2 to remove the dislocation and lead to colliding the extrusion each other between the pump piece 2, improve the pump liquid reliability. Specifically, the first guide structure and the second guide structure are sliding track structures with sliding grooves, preferably, the second guide structure is a sliding track, and the first guide structure is a sliding groove, but of course, the two structures may be replaced with each other.

In some embodiments, a first limiting structure is further disposed in the pump blade supporting frame 7, each pump blade 2 is provided with a second limiting structure 26 matched with the first limiting structure, and the pump blade 2 is limited to be removed from the pump blade supporting frame 7 by the limiting matching of the first limiting structure and the second limiting structure 26, that is, the pump blade 2 can move back and forth in the pump blade supporting frame 7, but when the pump blade 2 moves to the limiting contact of the first limiting structure and the second limiting structure 26, the pump blade 2 cannot move continuously in the direction, so that the pump blade 2 cannot move out of the pump blade supporting frame 7, and the pump blade group and the pump blade supporting frame 7 form a whole. So set up, when pump piece carriage 7 was dismantled from casing 6, because the pluggable separation of pump piece 2 and cam mechanism 4's drive end, consequently, can dismantle pump piece group and pump piece carriage 7 an organic whole, conveniently carry out whole washing to pump piece group. Specifically, first limit structure and second limit structure are spacing boss structure, carry on spacingly through two bosss.

In some of these embodiments, be provided with a plurality of gusset of arranging side by side in the rectangle through-hole of pump piece carriage 7, the gusset has seted up the draw-in groove of card income transfer line for fix a position transfer line 1, prevent that the position of transfer line 1 from taking place the skew, make things convenient for pump piece group and press pipe piece 3 to carry out the extrusion operation to transfer line 1, carry out the structure reinforcement through the gusset to pump piece carriage 7.

In some embodiments, the pump sheet supporting frame 7 may be detachably connected to the housing 6 through a snap structure, so as to facilitate disassembly and assembly, and of course, the pump sheet supporting frame 7 may also be connected through a threaded connection member.

In some of the embodiments, the infusion pump is further optimized, a waterproof membrane 8 is detachably disposed on a position of the casing 9, which is away from the extrusion end, of the pump sheet set, the waterproof membrane 8 is further provided with a plurality of through holes, the driving end of the cam mechanism 4 is in transmission connection with the pump sheet 2 after penetrating through the through holes of the waterproof membrane 8 in a sealing manner, and specifically, the driving end of the cam mechanism 4 is in interference fit with the through holes to realize sealing. The waterproof membrane 8 is made of flexible material to ensure the elastic sealing fit of the through hole and the driving end of the cam mechanism 4. The infusion tube 1 and the pump sheet 2 are isolated from the driving device 5 through the waterproof film 8, so that liquid is prevented from entering the driving device 5 through the waterproof film 8, the waterproof performance of the infusion pump is improved, the safety of the driving device 5 is protected, and the working reliability of the infusion pump is improved. The waterproof membrane 8 is detachably connected with the shell 6 through a buckle structure, so that the waterproof membrane is convenient to assemble and disassemble and can be connected through a threaded connecting piece.

In addition to the removable and separable connection of the drive end of the cam mechanism to the pump blade, in some embodiments, the drive end of the cam mechanism 4 may be fixedly hinged to the pump blade 2. Only so set up, the inconvenient quick dismantlement of pump piece group.

In some of the embodiments, such as the particular cam mechanism 4 shown in fig. 4 and 5, the cam mechanism 4 includes an eccentric 41 and a connecting rod portion 42; wherein, the eccentric wheel 41 is eccentrically connected with a camshaft, and the camshaft drives the eccentric wheel 41 to eccentrically rotate; one end of the connecting rod portion 42 is of an annular structure, the annular structure rotates to be sleeved on the outer circle of the eccentric wheel 41, the other end of the connecting rod portion 42 is a driving end, if the driving end of the cam mechanism 4 is connected with the pump piece 2 in a pluggable separation and rotation mode, one end of the connecting rod portion 42 is a round end, and the round end is connected with the arc clamping groove in the U-shaped groove 24 in a rotating mode. If the driving end of the cam mechanism 4 is fixed to the pump blade 2 by hinge, one end of the link portion 42 is provided with a hinge hole, and correspondingly, the pump blade 2 is also provided with a hinge hole, which is rotatably connected by a hinge shaft.

When the cam mechanism 4 works, the cam shaft rotates to drive the eccentric wheel 41 to eccentrically rotate, and the eccentric rotation of the eccentric wheel 41 drives the connecting rod part 42 to reciprocate, so as to drive the pump blade 2 to reciprocate linearly.

Of course, in some embodiments, the cam mechanism 4 may also be a crankshaft connecting rod mechanism, that is, a crankshaft structure is arranged on the camshaft, and the connecting rod is rotatably connected with an eccentric shaft section of the crankshaft, so that the connecting rod can also reciprocate.

In some of the embodiments, a specific driving device 5 as shown in fig. 1 includes a power unit 51 and a transmission assembly 52, wherein the power unit 51 may be an electric motor, a hydraulic motor, or the like; the camshaft is in driving connection with the power unit 51 via a drive assembly 52. When the camshaft driving device works, the power part 51 operates, and the torque at the output end of the power part 51 is transmitted to the camshaft through the transmission assembly to drive the camshaft to rotate. The power of the power unit 51 is decelerated or redirected by the transmission assembly 52. Of course, the drive 5 may also comprise only the power part 51, the power part 51 being in direct drive connection with the camshaft.

In some embodiments, the driving assembly 52 is a gear set, a belt pulley set or a chain wheel set, and the power component 51 and the cam shaft are preferably arranged in parallel and side by side, and are in driving connection through the gear set, the belt pulley set or the chain wheel set, so as to realize a compact structure of the infusion pump.

In some embodiments, the drive assembly 52 is a gear set, which forms a reduction mechanism, and is more compact.

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

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (18)

1. An infusion pump, characterized in that the infusion pump is adapted for use with an infusion tube, the infusion pump comprising:

the shell of the pump main body is provided with a pipe groove for placing the infusion pipe;

a pump door installed on the pump main body in a lockable and openable manner; the pump door is provided with a pressure pipe block;

wherein the pump body comprises:

the driving device is arranged in the shell;

the camshaft is in driving connection with the driving device and is provided with a plurality of cam mechanisms which are distributed along the axial direction of the camshaft;

pump sheet group, correspond set up in the pipe box and with press the pipe piece to set up in opposite directions, be used for with press pipe piece cooperation extrusion the transfer line, pump sheet group is including a plurality of pump sheets of arranging along the axial of camshaft, every pump sheet with the transmission of cam mechanism one-to-one is connected, the drive of cam mechanism the pump sheet of pump sheet group rectilinear movement with reciprocating, the extrusion end terminal surface of pump sheet is outwards orientation along the centre in proper order for ending liquid section, concora crush section and bounce-back section, concora crush section with the bounce-back section homogeneous phase is right end liquid section symmetrical arrangement, end liquid section concora crush section with the bounce-back section is right the extrusion degree of transfer line reduces in proper order.

2. The infusion pump of claim 1, wherein the pump sheets of said pump sheet set reciprocate in a wave pattern.

3. The infusion pump according to claim 1, wherein said liquid stop section is a bar-shaped prism, and the top surface of said bar-shaped prism is a convex arc surface or a flat surface or a pointed top.

4. The infusion pump according to claim 3, wherein the radius of said convex curved surface is less than or equal to 0.5 mm.

5. The infusion pump of claim 1, wherein a top surface of said platen is a plane parallel to said platen block.

6. The infusion pump according to claim 1, wherein a difference in height between a top surface of said platen section and a top surface of said liquid stop section is less than or equal to 0.6 mm.

7. The infusion pump according to claim 1, wherein said rebound section is a slope oblique to said tubing block or a flat or curved surface parallel to said tubing block.

8. The infusion pump of claim 7, wherein said bevel is inclined at an angle of 30 ° to 60 ° relative to said plunger.

9. The infusion pump according to claim 1, wherein the junction of said platen section and said liquid stop section is in transition with an inward concave arc, and the junction of said platen section and said rebound section is in transition with an outward convex arc.

10. The infusion pump according to claim 9, wherein said flattened section is a tangent point of said concave arc and said convex arc.

11. The infusion pump according to claim 1, wherein said liquid stop section, said platen section and said rebound section each have a width of 20% to 50% of the total width of said extrusion end face.

12. The infusion pump of claim 1, wherein said pump blade is a U-shaped body and said drive end of said cam mechanism is removably and detachably rotatably engaged in a U-shaped slot of said U-shaped body.

13. The infusion pump according to claim 12, wherein a pump sheet support frame is detachably disposed at the tube slot of the casing, the pump sheet group is reciprocally disposed in the pump sheet support frame, a guide structure is disposed in the pump sheet support frame and is in one-to-one guiding fit with each pump sheet, and a guiding direction of the guide structure is a reciprocating direction of the pump sheet; and a limiting structure used for limiting the pump sheet to be separated from the pump sheet supporting frame is further arranged in the pump sheet supporting frame.

14. The infusion pump according to claim 12, wherein a waterproof membrane is removably provided to said housing at a location of said pump sheet assembly facing away from said compression end, said cam mechanism sealingly passing through said waterproof membrane and drivingly engaging said pump sheet.

15. The infusion pump of claim 1, wherein said cam mechanism has a drive end fixedly hinged to said pump blade.

16. The infusion pump according to any one of claims 12-15, wherein said cam mechanism comprises:

the eccentric wheel is eccentrically connected with the camshaft;

and one end of the connecting rod part is rotatably sleeved on the excircle of the eccentric wheel, and the other end of the connecting rod part is the driving end.

17. The infusion pump according to claim 1, wherein said drive means comprises:

a power component;

and the cam shaft is in transmission connection with the power component through the transmission assembly.

18. The infusion pump of claim 17, wherein said drive assembly is a gear set, a pulley set, or a sprocket set.

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