Portable infusion device

Abstract

The utility model relates to the technical field of medical instruments, and provides a portable infusion device which comprises an upper shell and a lower shell, the lower shell is provided with a containing space, a top opening and a through hole, and the top opening and the through hole are communicated with the containing space. The upper shell is detachably arranged on the upper portion of the lower shell and provided with a force application body, a fixing assembly, a negative pressure assembly and a locking assembly, the lower end of the negative pressure assembly is connected with the force application body, the middle of the negative pressure assembly is installed in the upper shell through the fixing assembly, and the upper end of the negative pressure assembly is connected with the locking assembly. The medical liquid bag can be used without hanging by means of atmospheric pressure through the negative pressure assembly, is convenient to carry, can be repeatedly used, is convenient to unlock and lock, occupies a small space, is good in flexibility, can meet the requirements of infusion in different scenes, and greatly improves the universality of the device.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, specifically, relate to a portable infusion device. BACKGROUND

[0002] At present, medical staff in hospital when infusion for patient, need to hang the liquid medicine bag containing medicine liquid on the infusion support higher than the human head, make the liquid medicine bag and patient keep certain height difference, make the medicine liquid in the liquid medicine bag and human body produce certain pressure difference, thereby infusion for patient, generally speaking, the higher liquid medicine bag is hung, the greater infusion pressure is, the faster infusion speed is, it needs to be noted that the height of liquid medicine bag must be higher than the patient's body when infusion, otherwise not only infusion cannot be carried out, and back blood phenomenon also occurs.

[0003] But in some special conditions, such as night march emergency or war situation, the wounded are inconvenient to hang the infusion medicine bag in high place when walking or being carried by stretcher, aiming at the above special situation, an infusion device with suspension-free and portable is urgently needed to meet the needs of portable and emergency infusion. UTILITY MODEL CONTENT

[0004] In view of the defects in the prior art, the utility model aims at providing a portable infusion device.

[0005] According to the portable infusion device provided by the utility model, comprising:

[0006] Lower shell has accommodating space and top opening, through hole communicating the accommodating space, the accommodating space is used for placing liquid medicine bag, and the outlet pipeline of the liquid medicine bag extends to the outside of the lower shell through the through hole;

[0007] Upper shell is detachably arranged on the upper portion of the lower shell and is provided with force body, fixing assembly, negative pressure assembly and locking assembly, the lower end of the negative pressure assembly is connected with the force body, the middle portion is installed in the inside of the upper shell through the fixing assembly, and the upper end is connected with the locking assembly;When the locking assembly is unlocked, the negative pressure assembly can drive the force body to move into the accommodating space under the drive of external atmospheric pressure, and then the liquid medicine bag is extruded, so that the liquid in the liquid medicine bag flows out through the outlet pipeline.

[0008] Preferably, the negative pressure assembly comprises a piston body and a negative pressure shell, the piston body comprises a piston piece, a piston rod connected with the lower end of the piston piece, and a piston handle connected with the upper end of the piston rod, the lower end of the negative pressure shell is provided with a limiting piece, the piston piece is arranged in the inside of the negative pressure shell to form a negative pressure space between the piston piece and the negative pressure shell, and the piston piece is capable of moving between a first position and a second position under the drive of an external force, wherein the volume of the negative pressure space is smallest when the piston piece is in the first position, and the volume of the negative pressure space is largest when the piston piece is in the second position.

[0009] Preferably, the fixing assembly comprises an upper fixing plate and a lower fixing plate arranged in parallel and spaced apart from the upper fixing plate, the upper fixing plate is detachably connected with the lower fixing plate through a first connecting piece, and the upper fixing plate and / or the lower fixing plate is detachably fixed on the inner wall of the upper shell.

[0010] Preferably, the upper end of the negative pressure shell is detachably fixed on the lower fixing plate, the upper fixing plate is provided with a first guide hole, and the piston rod penetrates through the first guide hole.

[0011] Preferably, the fixing assembly further comprises a connecting rod, the upper fixing plate and the lower fixing plate are respectively provided with a second guide hole and a third guide hole, the lower end of the connecting rod is connected with the force applying body, the upper end of the connecting rod and the piston handle are both connected with a linkage, the connecting rod penetrates through the second guide hole and the third guide hole and is in clearance fit with the second guide hole and the third guide hole.

[0012] Preferably, the locking assembly comprises an upper locking piece and a lower locking piece, the lower locking piece is detachably arranged at the upper end of the linkage, the upper locking piece is detachably fixed at the upper end of the upper shell, and the upper locking piece and the lower locking piece have two states of locking and unlocking, in the unlocking state, the lower locking piece is capable of synchronous movement with the piston handle, and in the locking state, the lower locking piece is not allowed to move with the piston handle.

[0013] Preferably, the lower locking piece comprises a locker sleeve and a lower fixing disc, the lower fixing disc is detachably fixed on the linkage, the middle part of the lower fixing disc is provided with a first assembly hole, and the locker sleeve is detachably assembled into the first assembly hole.

[0014] The upper locking piece comprises a locker button and an upper fixing disc, the upper fixing disc is detachably fixed at the upper end of the upper shell, the middle part of the upper fixing disc is provided with a second assembly hole, and the locker button is detachably assembled into the second assembly hole.

[0015] Preferably, the middle part of the locking sleeve has a cross-shaped hole, the lower end of the locking button extends a boss downward, the circumference of the boss extends four locking columns in the radial outward direction, and when the piston is in the second position, rotating the locking button can make the locking columns locked below the cross-shaped hole or in the unlocking state.

[0016] Preferably, the force applying body bottom is further provided with a reversing assembly, and the extrusion direction can be changed from vertical extrusion to one side of the containing space extrusion to the medicine liquid bag through the reversing assembly when the force applying body moves towards the containing space.

[0017] Preferably, further comprising at least one setting:

[0018] The upper shell and the lower shell are buckled or threaded;

[0019] The number of the negative pressure assemblies is one or more groups;

[0020] The upper shell is provided with an observation hole;

[0021] The upper shell is provided with a rope passing port;

[0022] The upper shell is provided with a scale;

[0023] The lower shell is in a cylindrical structure;

[0024] The upper shell is in a cylindrical structure.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The utility model discloses with the help of atmospheric pressure, realizes that the medicine liquid bag is free from hanging and can use just, is convenient for carrying and can repeatedly use, and the unlocking and locking operation are convenient, and the occupied space is little, and the flexibility is good, can satisfy the demand of infusion under different scenes, and greatly promotes the versatility of device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-restrictive embodiments with reference to the accompanying drawings:

[0028] Figure 1 It is the external structure schematic diagram of the utility model;

[0029] Figure 2 It is the internal structure schematic diagram of the utility model, wherein, the upper shell is not drawn;

[0030] Figure 3 It is the structure schematic diagram of negative pressure assembly, wherein, the piston is in the first position;

[0031] Figure 4 Structure diagram of the negative pressure assembly, wherein the piston member is in the second position;

[0032] Figure 5 Structure diagram of the reversing assembly in Example 2;

[0033] Figure 6 Structure diagram of the reversing assembly in Example 3, wherein the medicine liquid bag has not yet outputted medicine liquid;

[0034] Figure 7 Structure diagram of the reversing assembly in Example 3, wherein the medicine liquid bag has outputted part of the medicine liquid;

[0035] Figure 8 Structure diagram of the pull rope.

[0036] Shown in the figure are:

[0037] Upper housing 1

[0038] Scale 11

[0039] Viewing hole 12

[0040] Rope passing port 13

[0041] Lower housing 2

[0042] Top opening 21

[0043] Through hole 22

[0044] Medicine liquid bag 3

[0045] Outlet pipeline 31

[0046] Switch valve 32

[0047] Force applying body 4

[0048] Fixing assembly 5

[0049] Upper fixing plate 51

[0050] First guide hole 511

[0051] Second guide hole 512

[0052] Lower fixing plate 52

[0053] Third guide hole 521

[0054] Connecting rod 53

[0055] Negative pressure assembly 6

[0056] Piston body 61

[0057] Piston member 611

[0058] piston handle 612

[0059] limiting piece 613

[0060] piston rod 614

[0061] negative pressure shell 62

[0062] negative pressure space 621

[0063] locking assembly 7

[0064] lock button 71

[0065] boss 711

[0066] locking column 7111

[0067] upper fixing disc 72

[0068] lock sleeve 73

[0069] cross-shaped hole 731

[0070] lower fixing disc 74

[0071] linkage 8

[0072] reversing assembly 9

[0073] fixed shaft 91

[0074] bent corner connecting rod 92

[0075] first shaft 921

[0076] second shaft 922

[0077] reversing output 93

[0078] driving block 94

[0079] spring 95

[0080] pushing block 96

[0081] guide plate 97

[0082] extrusion plate 98

[0083] pushing rod 99 DETAILED DESCRIPTION

[0084] The utility model will be explained in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0085] Embodiment 1:

[0086] The utility model provides a portable infusion device, as shown in Figure 1 、 Figure 2 , including upper casing 1 and lower casing 2, the inside of lower casing 2 has accommodating space and the top opening 21 of intercommunication accommodating space, through -hole 22, wherein, through -hole 22 is arranged at the side of lower casing 1, and the accommodating space is used to place the medicine liquid bag 3, and the outlet line 31 of medicine liquid bag 3 extends to the outside of lower casing 2 through through -hole 22, and the switch valve 32 is configured on the outlet line 31, which is used to control the on-off of outlet line 31.

[0087] Further, the upper casing 1 is detachably configured on the upper part of the lower casing 2, and the upper casing 1 and the lower casing 2 can be connected by snap connection, threaded connection or other detachable connection methods in the prior art, so that the upper casing 1 and the lower casing 2 have good stability after connection and are easy to disassemble. In actual application, the upper casing 1 and the lower casing 2 can be designed as cylindrical structures or various structures with a regular polygonal or elliptical cross section to meet actual needs.

[0088] Specifically, the upper casing 1 is further provided with a force applying body 4, a fixing assembly 5, a negative pressure assembly 6 and a locking assembly 7. The lower end of the negative pressure assembly 6 is connected to the force applying body 4, the middle part is installed in the inside of the upper casing 1 through the fixing assembly 5, and the upper end is connected to the locking assembly 7. When the locking assembly 7 is unlocked, the negative pressure assembly 6 can drive the force applying body 4 to move into the accommodating space and press the medicine liquid bag 3 under the drive of the external atmospheric pressure, so that the liquid in the medicine liquid bag 3 flows out through the outlet line 31. At this time, the force applying body 4 is located outside the upper casing 1.

[0089] As shown in Figure 3 、 Figure 4 , the number of negative pressure assemblies 6 is one or more groups. Each group of negative pressure assemblies 6 includes a piston body 61 and a negative pressure shell 62. The piston body 61 includes a piston piece 611, a piston rod 614 connected to the lower end of the piston piece 611, and a piston handle 612 connected to the upper end of the piston rod 614. The lower end of the negative pressure shell 62 is provided with a limiting piece 613 for limiting the upward movement of the force applying body 4. The piston piece 611 is arranged in the inside of the negative pressure shell 62 to form a negative pressure space 621 between the piston piece 611 and the negative pressure shell 62. The negative pressure space 621 is a closed space. The piston piece 611 can move between a first position and a second position. When the piston piece 611 is in the first position, the volume of the negative pressure space 621 is smallest, as shown in Figure 3 , the force applying body 4 is located outside the upper casing 1. When the piston piece 611 is in the second position, as shown in Figure 4As shown, the volume of the negative pressure space 621 is the largest, and the force applying body 4 is accommodated into the interior of the upper shell 1, at this time, the top of the force applying body 4 abuts against the limiting piece 613. In actual application, preferably, a plurality of groups of negative pressure assemblies 6 are adopted to make the pushing force more powerful, and improve the practicability of the product.

[0090] It should be noted that the limiting piece 613 not only plays a limiting role, but also plays a role of a plug, and can block the lower end of the negative pressure shell 62, so that the negative pressure space 621 is formed in the interior of the negative pressure shell 62. In addition, the limiting piece 613 can also be designed as a one-way valve, and the one-way valve makes the gas in the negative pressure space 621 be able to be discharged through the one-way valve, but does not allow the external atmosphere to enter the negative pressure space 621 through the one-way valve. By setting the one-way valve, not only the limiting effect can be achieved, but also the trace amount of air can be discharged when the piston piece 611 moves downward after the trace amount of air enters the negative pressure space 621 due to various problems, so that the vacuum degree of the negative pressure space 621 is always ensured.

[0091] As shown in the figure, Figure 2 As shown, the fixed assembly 5 includes an upper fixed plate 51, a lower fixed plate 52 arranged in parallel and spaced apart from the upper fixed plate 51, and a connecting rod 53, the upper fixed plate 51 is detachably connected with the lower fixed plate 52 through a first connecting piece, and the first connecting piece is preferably a screw, for example, a stainless steel internal hexagonal single-head screw, etc. The upper fixed plate 51 and / or the lower fixed plate 52 are detachably fixed on the inner wall of the upper shell 1, so that the upper shell 1 and the upper fixed plate 51 and the lower fixed plate 52 cannot move relative to each other. The upper end of the negative pressure shell 62 is detachably or non-detachably fixed on the lower fixed plate 52, and the upper fixed plate 51 has a first guide hole 511, and the piston rod 614 penetrates through the first guide hole 511, and the first guide hole 511 plays a guiding role in the process of the upward and downward movement of the piston rod 614, and can prevent the piston rod 614 from being radially deviated.

[0092] Further, the upper fixed plate 51 and the lower fixed plate 52 respectively have a second guide hole 512 and a third guide hole 521, the lower end of the connecting rod 53 is connected with the force applying body 4, the upper end of the connecting rod 53 and the piston handle 612 are both connected on the linkage 8, the connecting rod 53 penetrates through the second guide hole 512 and the third guide hole 521 and is in clearance fit with the second guide hole 512 and the third guide hole 521, under the action of the atmospheric pressure, the piston handle 612 can drive the linkage 8 to move downward synchronously, and further drive the connecting rod 53 and the force applying body 4 to move downward synchronously. It should be noted that the guidance in the movement of the force applying body 4 can be realized by the cooperation of the connecting rod 53 and the second guide hole 512, or by the cooperation of the piston rod 614 and the first guide hole 511, or by the cooperation of the two guiding structures, therefore, at least one set of guide holes can be designed, and the specific design can be flexibly selected according to the actual application scene.

[0093] As Figure 1 、 Figure 2 shown, the locking assembly 7 comprises an upper locking piece and a lower locking piece, the lower locking piece is detachably arranged at the upper end of the linkage 8, and the upper locking piece is detachably fixed at the upper end of the upper shell 1, and the upper locking piece and the lower locking piece have two states of locking and unlocking, in the unlocking state, the lower locking piece can be synchronously moved with the piston handle 612, and in the locking state, the lower locking piece is not allowed to move with the piston handle 612.

[0094] Specifically, the lower locking piece comprises a locker sleeve 73 and a lower fixing disc 74, the lower fixing disc 74 is detachably fixed on the linkage 8 through a second connecting piece, preferably a screw, and the middle part of the lower fixing disc 74 is provided with a first assembly hole, and the locker sleeve 73 is detachably assembled into the first assembly hole; the upper locking piece comprises a locker button 71 and an upper fixing disc 72, the upper fixing disc 72 is detachably fixed at the upper end of the upper shell 1, and the middle part of the upper fixing disc 72 is provided with a second assembly hole, and the locker button 71 is detachably assembled into the second assembly hole.

[0095] In the embodiment, the middle part of the locker sleeve 73 is provided with a circular hole, and four notches are arranged in the circumferential direction of the circular hole, and the circular hole and the four notches are in a cross structure when viewed from above, and together form a cross-shaped hole 731, the lower end of the locker button 71 extends downward to form a boss 711, the boss 711 is adapted to the circular hole, and four locking columns 7111 are extended in the radial direction outward in the circumferential direction of the boss 711, the locking columns 7111 are adapted to the notches, when the piston piece 611 is in the second position, the locking columns 7111 are extended below the circular hole, rotating the locker button 71 can make the upper end of the locking column 7111 abut against the body of the locker sleeve 73 and be locked below the cross-shaped hole 731, or the locking columns 7111 are just aligned with the notches up and down to make the locking assembly 7 in the unlocking state.

[0096] The upper shell 1 in the utility model is provided with an observation hole 12, and the negative pressure shell 62 is a transparent structure, so that the position of the piston piece 611 in the negative pressure shell 62 can be observed at any time through the observation hole 12, and meanwhile, the upper shell 1 can be provided with a scale 11, and the output condition of the liquid medicine can be understood by observing the position of the piston piece 611 corresponding to the scale 11.

[0097] It should be noted that the rope passing port 13 can also be designed as a channel communicating between the inside and the outside, and the two ends of the pull rope can be connected with the lower fixing disc 74 by entering the inside of the upper shell 1 through the rope passing port 13. Figure 8As shown, when it is necessary to pull the piston 611 upward, the piston 611 can be pulled upward relative to the negative pressure housing 62 by pulling the middle of the pull rope. When it reaches the lockable position, the locking button 71 can be rotated to lock and realize negative pressure energy storage.

[0098] Example 2:

[0099] The difference between this embodiment and embodiment 1 is that the bottom of the force-applying body 4 is also provided with a reversing component 9. When the force-applying body 4 moves toward the accommodating space, the reversing component 9 can change the squeezing direction from vertical squeezing to squeezing the medicine bag 3 toward one side of the accommodating space, so as to realize the outflow of medicine.

[0100] like Figure 2 , Figure 5 As shown, a drive column 41 is provided at the bottom of the force-applying body 4. The reversing assembly 9 includes a fixed shaft 91, a bent connecting rod 92, and a reversing output component 93. One end of the fixed shaft 91 is fixed to the inner wall of the lower housing 2, and the other end of the fixed shaft 91 is rotatably engaged with the middle of the bent connecting rod 92. The bent connecting rod 92 is located on one side of the receiving space and has a "7" shaped structure. The medicine bag 3 is located on the other side of the receiving space. The reversing output component 93 is configured near the bent connecting rod 92 via the first shaft 921. At one end of the liquid medicine bag 3, the lower end of the drive column 41 is rotatably engaged with the end of the bent angle connecting rod 92 away from the liquid medicine bag 3 via the second shaft 922. When the force-applying body 4 moves toward the receiving space, the drive column 41 pushes the end of the bent angle connecting rod 92 away from the liquid medicine bag 3, causing the bent angle connecting rod 92 to rotate around the fixed shaft 91. This causes the reversing output component 93 at the end close to the liquid medicine bag 3 to squeeze the liquid medicine bag 3. The liquid medicine bag 3 is subjected to the squeezing force along the radial direction of the lower housing 2, causing the liquid medicine to flow out through the outlet pipe 31.

[0101] It should be noted that this embodiment is applicable to scenarios where the liquid medicine bag 3 is small in volume. If the liquid medicine bag 3 is placed directly in the containing space and squeezed by the force-applying body 4, the effect is not good. This embodiment achieves a good effect by changing the squeezing method.

[0102] In this embodiment, the locking sleeve 73 has a straight hole in the middle, and the lower end of the locking button 71 extends downward to form a boss 711. Two locking pins 7111 extend outward in the radial direction of the boss 711. When the piston 611 is in the second position, rotating the locking button 71 can lock the locking pins 7111 below the straight hole or put them in the unlocked state.

[0103] Example 3:

[0104] The difference between this embodiment and Embodiment 1 is that, Figure 6 , Figure 7As shown, the bottom of the force body 4 is provided with a driving column 41, the reversing assembly 9 comprises a driving block 94, a spring 95, a pushing block 96, a guide plate 97, a pressing plate 98 and a pushing rod 99, the bottom of the guide plate 97 is fixed in the inside of the lower shell 2, the driving block 94 and the pushing block 96 are both wedge-shaped structures and matched with each other, the pushing rod 99 penetrates through the guide plate 97 and is connected with the pushing block 96 and the pressing plate 98 at both ends respectively, the pressing plate 98 and the lower shell 2 form a containing cavity, the containing cavity is used for accommodating the medicine bag 3, when the driving column 41 moves downward, the driving block 94 can be pushed to move downward synchronously, thereby driving the pushing block 96 to push the pressing plate 98 to extrude the medicine bag 3 to make the medicine flow out, at this time, the spring 95 is compressed and shortened; when the driving column 41 moves upward and leaves the driving block 94, the pushing block 96 pulls the pressing plate 98 to reset under the driving of the elastic restoring force of the spring 95.

[0105] Taking the embodiment 1 as an example, the working principle of the utility model is as follows:

[0106] Firstly, the locking assembly 7 is adjusted to the unlocking state, the upper shell 1 is pressed downward by hand, at this time, the force body 4 at the bottom is supported by the desktop or other objects, thereby driving the connecting rod 53 and the linkage 8 to move upward synchronously, the linkage 8 drives the piston rod 614 to move upward relative to the negative pressure shell 62, the volume of the negative pressure space 621 is increased, thereby storing the negative pressure energy, until the force body 4 contacts and abuts against the limiting piece 613, at this time, the volume of the negative pressure space 621 reaches the maximum, the locking assembly 7 is adjusted to the locking state.

[0107] Secondly, the medicine bag 3 is placed into the containing space, the lower shell 2 is assembled to the upper shell 1, and waiting for use.

[0108] Finally, when the medicine needs to be output, the locking assembly 7 is adjusted to the unlocking state, the switch valve 32 is opened and the opening degree of the switch valve 32 is adjusted, under the driving of the external atmospheric pressure, the medicine flows out from the outlet pipeline 31.

[0109] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0110] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A portable infusion device, characterized by, The application relates to a negative pressure type medicine liquid bag squeezing device, which comprises a lower shell (2) and an upper shell (1). The lower shell (2) has a containing space for placing a medicine liquid bag (3), a top opening (21) and a through hole (22) for communicating with the containing space, and an outlet pipeline (31) of the medicine liquid bag (3) extends to the outside of the lower shell (2) through the through hole (22). The upper shell (1) is detachably arranged on the upper part of the lower shell (2) and is provided with a force applying body (4), a fixing assembly (5), a negative pressure assembly (6) and a locking assembly (7), the lower end of the negative pressure assembly (6) is connected with the force applying body (4), the middle part is installed in the inside of the upper shell (1) through the fixing assembly (5), and the upper end is connected with the locking assembly (7); when the locking assembly (7) is unlocked, the negative pressure assembly (6) can drive the force applying body (4) to move into the containing space under the drive of the external atmospheric pressure, and the force applying body (4) can squeeze the medicine liquid bag (3) so that the liquid in the medicine liquid bag (3) flows out through the outlet pipeline (31).

2. The portable infusion device of claim 1, wherein The negative pressure assembly (6) comprises a piston body (61) and a negative pressure shell (62), the piston body (61) comprises a piston piece (611), a piston rod (614) connected with the lower end of the piston piece (611) and a piston handle (612) connected with the upper end of the piston rod (614), the lower end of the negative pressure shell (62) is provided with a limiting piece (613), the piston piece (611) is arranged in the inside of the negative pressure shell (62) and forms a negative pressure space (621) between the piston piece (611) and the negative pressure shell (62), and the piston piece (611) can move between a first position and a second position under the drive of an external force, wherein the volume of the negative pressure space (621) is the smallest when the piston piece (611) is in the first position, and the volume of the negative pressure space (621) is the largest when the piston piece (611) is in the second position.

3. The portable infusion device of claim 2, wherein, The fixing assembly (5) comprises an upper fixing plate (51) and a lower fixing plate (52) arranged in parallel and spaced apart from the upper fixing plate (51), the upper fixing plate (51) is detachably connected with the lower fixing plate (52) through a first connecting piece, and the upper fixing plate (51) and / or the lower fixing plate (52) are detachably fixed on the inner wall of the upper shell (1).

4. The portable infusion device of claim 3, wherein, The upper end of the negative pressure shell (62) is detachably fixed on the lower fixing plate (52), the upper fixing plate (51) is provided with a first guide hole (511), and the piston rod (614) penetrates through the first guide hole (511).

5. The portable infusion device of claim 3 or 4, wherein, The fixing assembly (5) further comprises a connecting rod (53), the upper fixing plate (51) and the lower fixing plate (52) are respectively provided with a second guide hole (512) and a third guide hole (521), the lower end of the connecting rod (53) is connected with the force applying body (4), the upper end of the connecting rod (53) and the piston handle (612) are connected on a linkage (8), the connecting rod (53) penetrates through the second guide hole (512) and the third guide hole (521) and is in clearance fit with the second guide hole (512) and the third guide hole (521).

6. The portable infusion device of claim 5, wherein, The locking assembly (7) comprises an upper locking piece and a lower locking piece which is detachably arranged at the upper end of the linkage (8), the upper locking piece is detachably fixed at the upper end of the upper shell (1), the upper locking piece and the lower locking piece have two states of locking and unlocking, in the unlocking state, the lower locking piece can move synchronously with the piston handle (612), in the locking state, the lower locking piece is not allowed to move with the piston handle (612).

7. The portable infusion device of claim 6, wherein, The lower locking piece comprises a locker sleeve (73) and a lower fixing disc (74), the lower fixing disc (74) is detachably fixed on the linkage (8), the middle part of the lower fixing disc (74) has a first assembly hole, the locker sleeve (73) is detachably assembled into the first assembly hole; The upper locking piece comprises a locker button (71) and an upper fixing disc (72), the upper fixing disc (72) is detachably fixed at the upper end of the upper shell (1), the middle part of the upper fixing disc (72) has a second assembly hole, the locker button (71) is detachably assembled into the second assembly hole.

8. The portable infusion device of claim 7, wherein, The middle part of the locker sleeve (73) has a cross-shaped hole (731), the lower end of the locker button (71) extends downwardly to form a boss (711), the circumferential direction of the boss (711) extends radially outwardly to form four locking columns (7111), when the piston piece (611) is in the second position, rotating the locker button (71) can make the locking columns (7111) be locked below the cross-shaped hole (731) or in the unlocking state.

9. The portable infusion device of claim 8, wherein, The bottom of the force applying body (4) is further provided with a reversing assembly (9), when the force applying body (4) moves towards the containing space, the pressing direction can be changed from vertical pressing to pressing the medicine bag (3) to one side of the containing space through the reversing assembly (9).

10. The portable infusion device of claim 1, wherein, Further comprising at least one setting: The upper shell (1) and the lower shell (2) are snap connected or screw connected; The number of the negative pressure assemblies (6) is one group or multiple groups; The upper shell (1) is provided with an observation hole (12); The upper shell (1) is provided with a rope passing port (13); The upper shell (1) is provided with a scale (11); The lower shell (2) is a cylindrical structure; The upper shell (1) is a cylindrical structure.

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