Portable infusion device

Abstract

The utility model relates to the technical field of medical instruments, and provides a portable infusion device which comprises a negative pressure energy storage mechanism and a liquid storage mechanism, the negative pressure energy storage mechanism is provided with a first shell and a connecting rod, the end of the connecting rod can slide in the first shell, and a negative pressure cavity and a first space are respectively formed between the connecting rod and the first shell; the liquid storage mechanism is provided with a second shell and a sliding part arranged in the second shell, the sliding part divides the interior of the second shell into a second space and a third space, the first space and the second space are filled with fluid and connected through a fluid pipeline, and infusion can be achieved under driving of external atmospheric pressure. The portable infusion device is stable in pressure, flexible to use and free of mechanical noise, and has the advantages of being small in occupied space, free of suspension, low in noise and portable.

Description

TECHNICAL FIELD

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

[0002] At present, when medical staffs in hospital infuse patients, need to hang the liquid medicine bag containing medicine liquid on the infusion support higher than the human head, keep certain height difference between the liquid medicine bag and the patient, produce certain pressure difference between the medicine liquid in the liquid medicine bag and the human body, thereby infuse the patient, generally speaking, the higher the liquid medicine bag is hung, the greater the infusion pressure is, the faster the infusion speed is, but the height of the liquid medicine bag must be higher than the patient's body during infusion, otherwise will lead to infusion unable to carry out or exist infusion not smooth situation, and still can take place the back blood phenomenon, the shortcoming of this infusion mode is that the space is occupied big, and lacks flexibility.

[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, there is an urgent need for a portable infusion device with free hanging, low noise and portability to meet the needs of portable and emergency infusion. UTILITY MODEL CONTENTS

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

[0005] According to the utility model provides a kind of portable infusion device, comprising:

[0006] Negative pressure energy storage mechanism has first shell and the connecting rod with end portion can slide in the first shell, the connecting rod and the first shell between respectively form negative pressure cavity, first space;

[0007] Liquid storage mechanism has second shell and sliding member arranged in the second shell, the sliding member divides the inside of the second shell into second space, third space, the first space, second space are filled with fluid and are connected by fluid line, under the drive of negative pressure in the negative pressure cavity, the connecting rod can make the fluid in the first space enter the second space through fluid line and then push sliding member to slide in the second shell and extrude the medicine liquid of third space.

[0008] According to the utility model provides a kind of portable infusion device, comprising:

[0009] Negative pressure energy storage mechanism has first shell and connecting rod, the connecting rod has first end portion and second end portion, the first end portion extends to the inside of the first shell and forms negative pressure cavity between the first shell;

[0010] The liquid storage mechanism comprises a second housing and a sliding member arranged in the second housing, the sliding member divides an inner part of the second housing into a second space and a third space, the second end extends into the second space, and the second end is capable of moving in the second space under the drive of negative pressure in the negative pressure cavity, thereby pushing the sliding member to slide in the second housing and extruding the liquid medicine in the third space.

[0011] Preferably, the first housing and the second housing are integrated.

[0012] Preferably, the fluid pipeline is provided with a control member capable of controlling the opening and closing of the fluid pipeline.

[0013] Preferably, the second housing is detachably provided with an end cover, and the third space is formed between the end cover and the sliding member.

[0014] Preferably, the connecting rod is provided with a first rotating disc through a first rotating shaft, and the first housing or the second housing is provided with a second rotating disc through a second rotating shaft, the second rotating shaft is offset from the center of the second rotating disc, and the first rotating disc contacts the second rotating disc, so that when the second rotating disc rotates, the first rotating disc is driven to move the connecting rod away from the first housing and / or the second housing.

[0015] An end of the second rotating disc is provided with a circular arc groove matched with the first rotating disc, and when the rotating angle of the second rotating disc reaches 180°, the end of the first rotating disc enters the circular arc groove, so that the first rotating disc and the second rotating disc do not produce relative motion, thereby being in a locked state.

[0016] Preferably, the side of the sliding member away from the third space is provided with a partition plate, and one side and a first end of the partition plate jointly form the negative pressure cavity with the first housing.

[0017] Preferably, the other side of the partition plate is provided with a wedge-shaped block, and the second end is a moving extrusion member, which rolls or slides along the surface of the wedge-shaped block when the connecting rod is driven to move towards the inside of the device by external atmospheric pressure, thereby driving the sliding member to extrude the liquid medicine in the third space.

[0018] Preferably, the second space directly stores fluid or stores fluid through a flexible bag, and the third space directly stores liquid medicine or stores liquid medicine through a flexible bag.

[0019] The cross-sectional areas of the first space, the second space and the third space are S1, S2 and S3 respectively, and the following settings are provided:

[0020] S1 < S2 < S3.

[0021] S1=S2=S3;

[0022] S1>S2>S3;

[0023] S1>S2=S3;

[0024] S1

[0025] Preferably, the first shell and the second shell are integrally formed to form a device shell, an inside of the device shell is provided with a stepped space, one side of the sliding piece is a plane, and the other side is a cylindrical boss, the plane and the end cover form the third space, and the cylindrical boss and the device shell form the second space.

[0026] Compared with the prior art, the device has the following beneficial effects:

[0027] The portable infusion device in the utility model can perform stable infusion without the liquid medicine bag being higher than the patient's body, has stable pressure, is flexible to use, has no mechanical noise, has the advantages of small space occupation, free suspension, low noise and portability. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other features, objects and advantages of the utility model will become more apparent through reading the detailed description of the non-restrictive embodiments with reference to the following drawings:

[0029] Figure 1 It is a structural section view schematic diagram of the embodiment 1;

[0030] Figure 2 It is a structural top view schematic diagram of the embodiment 2;

[0031] Figure 3 It is a three-dimensional structural schematic diagram of the embodiment 2;

[0032] Figure 4 It is a structural exploded schematic diagram of the embodiment 2;

[0033] Figure 5 It is a side structural schematic diagram of the embodiment 2;

[0034] Figure 6 It is Figure 5 A-A direction section schematic diagram;

[0035] Figure 7 It is a front structural schematic diagram of the embodiment 2;

[0036] Figure 8 It is Figure 7 B-B direction section schematic diagram;

[0037] Figure 9 isometric view of embodiment 4;

[0038] Figure 10 exploded view of embodiment 4;

[0039] Figure 11 bottom view of embodiment 4;

[0040] Figure 12 side view of embodiment 4 in one direction;

[0041] Figure 13 is Figure 12 sectional view in A-A direction;

[0042] Figure 14 is Figure 12 sectional view in B-B direction;

[0043] Figure 15 sectional view of embodiment 3;

[0044] Figure 16 isometric view of embodiment 3;

[0045] Figure 17 exploded view of embodiment 3;

[0046] Figure 18 view of the slider in embodiment 3;

[0047] Figure 19 top view of embodiment 3;

[0048] Figure 20 is Figure 19 sectional view in B-B direction.

[0049] shown in the figure:

[0050] negative pressure energy storage mechanism 1

[0051] first housing 11

[0052] first space 111

[0053] negative pressure cavity 112

[0054] link 12

[0055] first end 121

[0056] second end 122

[0057] first rotating disc 123

[0058] first rotating shaft 1231

[0059] Second rotating disc 124

[0060] Second rotating shaft 1241

[0061] Circular arc groove 1242

[0062] Handle 1242

[0063] Liquid storage mechanism 2

[0064] Second housing 21

[0065] Second space 211

[0066] Third space 212

[0067] End cover 213

[0068] Slide 22

[0069] Partition 221

[0070] Wedge block 222

[0071] Fluid line 3

[0072] Control 31 DETAILED DESCRIPTION

[0073] The utility model will be described in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art 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.

[0074] Example 1:

[0075] The utility model provides a kind of portable infusion device, as Figure 1 As shown, including negative pressure energy storage mechanism 1 and liquid storage mechanism 2, negative pressure energy storage mechanism 1 has first housing 11 and the link 12 of end portion can slide in first housing 11, link 12 and first housing 11 between respectively form negative pressure cavity 112, first space 111, link 12 is preferably connected (such as U-shaped) structure, link 12 has first end 121 and second end 122, wherein, first end 121 and first housing 11 between form negative pressure cavity 112, second end 122 and first housing 11 between form first space 111.

[0076] It should be noted that the first shell 11 has a first through hole and a second through hole, the part of the first end 121 extending to the outside of the first shell 11 penetrates the first through hole and is in gap cooperation with the first through hole, which can play a guiding role for the connecting rod 12 on the one hand, and on the other hand, the gap can be in communication with the external atmosphere, which can play a role of gas flow when the first end 121 slides in the first shell 11, and will not hinder the movement of the first end 121 in the first shell 11; similarly, the part of the second end 122 extending to the outside of the first shell 11 penetrates the second through hole and is in gap cooperation with the second through hole, and the gap in the second through hole has the same effect as the gap in the first through hole. In addition, when the volume of the negative pressure cavity 112 is 0, the volume of the first space 111 is also 0, at this time the portable infusion device is in the initial state, when pulling the connecting rod 12 to the outside of the first shell 11, the volume of the negative pressure cavity 112 gradually increases, until the connecting rod 12 is limited when the volume of the negative pressure cavity 112 reaches the maximum, at this time, the portable infusion device is in the maximum energy storage state. In actual application, according to the demand of infusion, the maximum volume that the negative pressure cavity 112 of the portable infusion device can reach can be flexibly set, and a stop limiting structure such as a stop table, a latch and the like can be arranged on the first shell 11 to realize the energy storage demand of the negative pressure cavity 112.

[0077] Further, the liquid storage mechanism 2 has a second shell 21 and a sliding piece 22 arranged in the second shell 21, the sliding piece 22 can adopt a rigid structure (plate structure or sheet structure) and can form a squeezing motion relative to the third space 212. The sliding piece 22 divides the inside of the second shell 21 into a second space 211 and a third space 212, the first space 111 and the second space 211 are both filled with fluid and are connected through the fluid pipeline 3, under the drive of the negative pressure in the negative pressure cavity 112, the connecting rod 12 can push the fluid in the first space 111 to enter the second space 211 through the fluid pipeline 3, and then push the sliding piece 22 to slide in the second shell 21 and squeeze the liquid medicine in the third space 212 out.

[0078] Specifically, when the portable infusion device is in the maximum energy storage state, the connecting rod 12 has a tendency to be pushed into the first housing 11 due to the action of the external atmospheric pressure, in order to be able to control the action of the connecting rod 12, the fluid pipeline 3 is provided with a control piece 31 capable of controlling the on-off of the fluid pipeline 3, the control piece 31 is preferably a clip, and a valve or the like can also be used, when the control piece 31 is closed, the fluid in the fluid pipeline 3 is not allowed to flow, therefore, the fluid in the first space 111 cannot flow out, which is equivalent to locking the connecting rod 12;When the control piece 31 is opened, the connecting rod 12 is pushed into the first housing 11 under the drive of the external air pressure, and then pushes the fluid in the first space 111 to flow into the second space 211 through the fluid pipeline 3, and then pushes the sliding piece 22 to slide in the second housing 21, at this time, the sliding piece 22 extrudes the medicine liquid in the third space 212, and then extrudes the medicine liquid in the third space 212, realizing the delivery of the medicine liquid.

[0079] Specifically, the first housing 11 and the second housing 21 are a split structure or an integral structure, and can be flexibly selected according to the actual application scene.

[0080] In actual application, the second space 211 can directly store fluid, and can also store fluid through a flexible bag, and the third space 212 can also directly store medicine liquid, or store medicine liquid through a flexible bag, and the specific selection can be flexibly selected according to the actual application scene.

[0081] Specifically, the cross-sectional areas of the first space 111, the second space 211 and the third space 212 are S1, S2 and S3 respectively, and the cross-sectional areas of the three spaces can be flexibly designed to realize different infusion requirements, specifically, S1<S2<S3 can be set, which can improve the infusion precision, and the medicine liquid pushed out by the first space 111 with small cross-sectional area drives the medicine liquid with large cross-sectional area, that is, the large stroke movement of the connecting rod 12 can only drive the small stroke movement of the sliding piece 22, realizing the high-precision extrusion movement infusion requirement of force amplification. In addition, the cross-sectional areas of the three spaces can also be set as S1=S2=S3, S1>S2>S3, S1>S2=S3, S1<S2=S3, etc., to realize various infusion requirements.

[0082] The driving force of the utility model can be adjusted as needed, the fluid transmission is flexibly arranged, is not limited by space, the fluid pipeline is blocked to realize locking, therefore the driving structure is simple, the component parts are few, has high reliability and stability, and the start and stop of negative pressure movement are more simple and reliable relative to the form of mechanical locking.

[0083] Embodiment 2:

[0084] This embodiment is a preferred example of embodiment 1.

[0085] As Figure 2 , Figure 3 ,Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, an end cap 213 is detachably mounted on the second housing 21. Preferably, the end cap 213 is mounted on the second housing 21 by screwing or snapping, forming a third space 212 between the end cap 213 and the sliding member 22. In practical applications, when it is necessary to place the liquid medicine into the third space 212, simply remove the end cap 213 by screwing it off, place the liquid medicine bag into the third space 212, and then screw the end cap 213 back onto the second housing 21.

[0086] In this embodiment, the first housing 11 and the second housing 21 are preferably an integral piece, forming the outer shell of the device through integral molding, and have a square structure when viewed from above. The fluid pipeline 3 can be partially disposed on the outside of the device shell, and a clamp is disposed on the fluid pipeline 3 so that the user can open or close the clamp at any time to control the infusion process.

[0087] like Figure 4 As shown, the device housing has a stepped space inside. One side of the slider 22 is a plane, forming a third space 212 between the plane and the end cap 213. The other side of the slider 22 is a boss, which is cylindrical. The cross-section of the slider 22 is T-shaped, and it appears circular when viewed from above. A second space 211 is formed between the cylindrical boss and the device housing. The plane end and the cylindrical boss end of the slider 22 slide with the upper and lower parts of the stepped space, respectively. Smooth relative movement is achieved between the slider 22 and the second housing 21 through the fit of large and small gaps. It should be noted that if a flexible medicine bag is placed in the third space 212 to hold the medicine, the sealing design of the third space 212 does not need to be considered. If the third space 212 directly holds the medicine, the relative sealing of the slider 22 and the device housing during sliding needs to be considered. Preferably, the circumferential surfaces of the plane end and the cylindrical boss end of the slider 22 are made of sealing material.

[0088] Example 3:

[0089] This embodiment is a variation of Embodiment 1.

[0090] This embodiment provides a portable infusion device, such as... Figure 15As shown, the device comprises a negative pressure energy storage mechanism 1 and a liquid storage mechanism 2. The negative pressure energy storage mechanism 1 comprises a first housing 11 and a connecting rod 12. The connecting rod 12 has a first end 121 and a second end 122. The first end 121 extends into the first housing 11 and forms a negative pressure cavity 112 with the first housing 11. The liquid storage mechanism 2 comprises a second housing 21 and a sliding member 22 arranged in the second housing 21. The sliding member 22 divides the interior of the second housing 21 into a second space 211 and a third space 212. The second end 122 extends into the second space 211. Under the drive of the negative pressure in the negative pressure cavity 112, the second end 122 can move in the second space 211, thereby pushing the sliding member 22 to slide in the second housing 21 and expelling the liquid in the third space 212.

[0091] In this embodiment, as shown in Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 The first housing 11 and the second housing 21 are integrally formed to form a device housing, which has a square structure in plan view.

[0092] Specifically, a cap 213 is detachably arranged on the device housing. The cap 213 is preferably arranged on the second housing 21 by screwing or buckling. The cap 213 and the sliding member 22 form the third space 212. After the cap 213 is assembled, the top of the device housing protrudes to form a cylindrical boss, and the bottom has a square structure.

[0093] As shown in Figure 18 、 Figure 19 、 Figure 20 The sliding member 22 is provided with a partition plate 221 on the side opposite to the third space 212. The partition plate 221, the first end 121 and the first housing 11 together form the negative pressure cavity 112. The partition plate 221 is provided with a wedge-shaped block 222 on the other side. The wedge-shaped block 222 has a triangular or trapezoidal structure. The second end 122 is a moving and extruding member, which can slide, roll or roll-slide relative to the wedge-shaped block 222. When the external atmospheric pressure drives the connecting rod 12 to move towards the interior of the device housing, the moving and extruding member rolls or slides along the surface of the wedge-shaped block 222. The moving and extruding member moves on the inclined surface and gradually rises, thereby driving the sliding member 22 to move towards the third space 212, and expelling the liquid in the third space 212.

[0094] It should be noted that the connecting rod 12 can be locked by using the locking structure in the prior art, which is not described here.

[0095] Embodiment 4:

[0096] This embodiment is another variation of embodiment 1.

[0097] In this embodiment, as shown in Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 The first rotating disc 123 is arranged on the connecting rod 12 through the first rotating shaft 1231, the second rotating disc 124 is arranged on the first shell 11 or the second shell 21 through the second rotating shaft 1241, and the second rotating shaft 1241 deviates from the center of the second rotating disc 124. The first rotating disc 123 is in contact with the second rotating disc 124, and when the second rotating disc 124 rotates, the first rotating disc 123 can drive the connecting rod 12 to move away from the first shell 11 and / or the second shell 21.

[0098] Specifically, as shown in Figure 11 At this time, the portable infusion device is in an initial state. When the second rotating disc 124 is rotated around the second rotating shaft 1241 by pinching the handle 1242, the first rotating disc 123 is pressed, so that the first rotating disc 123 drives the connecting rod 12 to move away from the device shell. When the second rotating disc 124 rotates by 180°, the portable infusion device is in a maximum energy storage state. At this time, the connecting rod 12 can be locked, and the connecting rod 12 can be unlocked when infusion is needed. The end of the second rotating disc 124 is provided with a circular arc groove 1242 matched with the first rotating disc 123. When the second rotating disc 124 rotates by 180°, the first rotating disc 123 rolls into the circular arc groove 1242 of the second rotating disc 124. At this time, the axis of the first rotating shaft 1231, the axis of the second rotating shaft 1241 and the center of the circle where the circular arc groove 1242 is located are on the same straight line, and the connecting line of the two axes is a straight line without torque. Therefore, the first rotating disc 123 and the second rotating disc 124 do not produce relative motion, and are in a locked state. Therefore, the control member 31 can be omitted in this embodiment, and the negative pressure driving lock is realized by a mechanical mode.

[0099] Taking Embodiment 2 as an example, the working principle of the utility model is as follows:

[0100] When infusion is needed, the connecting rod 12 is pulled to the outside of the device shell to adjust the volume of the negative pressure cavity 112 to the maximum. At this time, the control member 31 is closed, then the end cover 213 is removed, the medicine bag is placed in the third space 212, and the infusion pipeline connected with the medicine bag is passed through the through hole on the device shell to the outside. At this time, the end cover 213 is assembled to the device shell.

[0101] When infusion is needed, the control member 31 is opened, at this time the connecting rod 12 is pushed into the device shell under the drive of external air pressure, in turn pushes the fluid in the first space 111 to flow into the second space 211 through the fluid pipeline 3, the fluid in the second space 211 is more in turn to push the sliding member 22 to slide in the device shell, at this time the sliding member 22 extrudes the medicine liquid bag in the third space 212, in turn extrudes the medicine liquid of the third space 212, the medicine liquid is transported to the outside through the infusion pipeline, realizes the infusion operation of the medicine liquid.

[0102] The utility model can realize simple structure, efficient direct drive and high-precision liquid pumping effect through fluid or structural member (wedge).

[0103] 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, and therefore cannot be understood as limiting the present application.

[0104] The specific embodiments of the utility model have been described above. It should be understood that the utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the utility model. 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 utility model relates to a negative pressure energy storage mechanism (1) has first casing (11) and the connecting rod (12) of end portion can slide in first casing (11), the connecting rod (12) and first casing (11) form negative pressure cavity (112) respectively, first space (111) between, Liquid storage mechanism (2) has second casing (21) and the slider (22) is arranged in second casing (21), the slider (22) divides the interior of second casing (21) into second space (211), third space (212), first space (111), second space (211) are filled with fluid and are connected through fluid pipeline (3), under the drive of negative pressure in negative pressure cavity (112), the connecting rod (12) can make fluid in first space (111) enter second space (211) through fluid pipeline (3) and push the slider (22) to slide in second casing (21) and extrude the liquid medicine of third space (212) in second casing (21). First casing (11) and second casing (21) are integral.

2. The portable infusion device of claim 1, wherein The control piece (31) that can control the on-off of fluid pipeline (3) is arranged on fluid pipeline (3).

3. The portable infusion device of claim 1, wherein The end cover (213) is detachably arranged on second casing (21), and the third space (212) is formed between the end cover (213) and the slider (22).

4. The portable infusion device of claim 1, wherein, The first rotating disc (123) is arranged on the connecting rod (12) through the first rotating shaft (1231), the second rotating disc (124) is arranged on the first casing (11) or the second casing (21) through the second rotating shaft (1241), the second rotating shaft (1241) deviates from the center of the second rotating disc (124), the first rotating disc (123) contacts the second rotating disc (124), and when the second rotating disc (124) rotates, the first rotating disc (123) can be driven to move the connecting rod (12) in the direction away from the first casing (11) and / or the second casing (21); 5. The portable infusion device of claim 1, wherein The end of the second rotating disc (124) is provided with a circular arc groove (1242), the circular arc groove (1242) is matched with the first rotating disc (123), when the rotating angle of the second rotating disc (124) reaches 180 degrees, the end of the first rotating disc (123) enters the circular arc groove (1242), so that the first rotating disc (123) and the second rotating disc (124) do not produce relative motion, and are in a locked state. The second space (211) directly stores fluid or stores fluid through a flexible bag, and the third space (212) directly stores liquid medicine or stores liquid medicine through a flexible bag; 6. The portable infusion device of claim 1, wherein, The cross-sectional areas of the first space (111), the second space (211) and the third space (212) are S1, S2 and S3 respectively, and any one of the following settings is adopted: S1 S1=S2=S3; S1 S1=S2=S3. ​ ​ 7. The portable infusion device of claim 4, wherein, The first shell (11) and the second shell (21) are integrally formed to form a device shell, the inside of the device shell is provided with a stepped space, one side of the sliding piece (22) is a plane, and the other side is a cylindrical boss, the plane and the end cover (213) form the third space (212), and the cylindrical boss and the device shell form the second space (211).

8. A portable infusion device, characterized by The device shell comprises: A negative pressure energy storage mechanism (1) comprising a first shell (11) and a connecting rod (12), the connecting rod (12) has a first end (121) and a second end (122), the first end (121) extends into the inside of the first shell (11) and forms a negative pressure cavity (112) with the first shell (11); A liquid storage mechanism (2) comprising a second shell (21) and a sliding piece (22) arranged in the second shell (21), the sliding piece (22) divides the inside of the second shell (21) into a second space (211) and a third space (212), the second end (122) extends into the second space (211) and is driven by negative pressure in the negative pressure cavity (112) to move in the second space (211) and push the sliding piece (22) to slide in the second shell (21) and extrude liquid medicine in the third space (212).

9. The portable infusion device of claim 8, wherein, The first shell (11) and the second shell (21) are an integral part.

10. The portable infusion device of claim 8, wherein, The second shell (21) is detachably provided with an end cover (213), and the end cover (213) and the sliding piece (22) form the third space (212).

11. The portable infusion device of claim 8, wherein, The connecting rod (12) is provided with a first rotating disc (123) through a first rotating shaft (1231), the first shell (11) or the second shell (21) is provided with a second rotating disc (124) through a second rotating shaft (1241), the second rotating shaft (1241) deviates from the center of the second rotating disc (124), the first rotating disc (123) contacts the second rotating disc (124), and when the second rotating disc (124) rotates, the first rotating disc (123) is driven to move the connecting rod (12) away from the first shell (11) and / or the second shell (21); An end of the second rotating disc (124) is provided with a circular-arc groove (1242) matched with the first rotating disc (123), when the second rotating disc (124) rotates to an angle of 180°, the end of the first rotating disc (123) enters the circular-arc groove (1242), so that the first rotating disc (123) and the second rotating disc (124) do not relatively move and are in a locked state.

12. The portable infusion device of claim 8, wherein, The side, away from the third space (212), of the sliding piece (22) is provided with a partition plate (221), one side of the partition plate (221), the first end (121) and the first shell (11) jointly enclose the negative pressure cavity (112).

13. The portable infusion device of claim 12, wherein, The other side of the partition (221) is provided with a wedge block (222), and the second end (122) is a moving extrusion part. When the external atmospheric pressure drives the connecting rod (12) to move towards the inside of the device, the moving extrusion part rolls and / or slides along the surface of the wedge block (222), thereby driving the sliding part (22) to extrude the liquid medicine in the third space (212).

14. The portable infusion device of claim 10, wherein, The first shell (11) and the second shell (21) are integrally formed to form a device shell, the inside of the device shell is provided with a stepped space, one side of the sliding part (22) is a plane, and the other side is a cylindrical boss, the plane and the end cover (213) form the third space (212), and the cylindrical boss and the device shell form the second space (211).

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