Infusion device

Abstract

The invention belongs to the technical field of medical instruments, and provides an 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 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 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 present invention relates to the technical field of medical devices, and in particular to an infusion device. Background Art

[0002] At present, when medical staff in hospitals infuse patients, they need to hang the liquid medicine bag containing liquid medicine upside down on an infusion stand higher than the human head, so that a certain height difference is maintained between the liquid medicine bag and the patient, so that a certain pressure difference is generated between the liquid medicine in the liquid medicine bag and the human body, so as to infuse the patient. Generally speaking, the higher the liquid medicine bag is hung, the greater the infusion pressure and the faster the infusion speed. However, during infusion, the height of the liquid medicine bag must be higher than the patient's body, otherwise the infusion cannot be carried out or the infusion is not smooth, and blood return may also occur. The disadvantages of this infusion method are that it takes up a lot of space and lacks flexibility.

[0003] However, in some special circumstances, such as night march emergency or war, it is inconvenient to hang the infusion bag high when the wounded are walking or transported by stretchers. In view of the above special circumstances, there is an urgent need for a suspension-free, low-noise, portable infusion device to meet the needs of portable, emergency infusion. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide an infusion device.

[0005] According to the present invention, an infusion device is provided, comprising:

[0006] A negative pressure energy storage mechanism comprises a first shell and a connecting rod whose end can slide in the first shell, wherein a negative pressure cavity and a first space are respectively formed between the connecting rod and the first shell;

[0007] The liquid storage mechanism comprises a second shell and a sliding member arranged in the second shell, wherein the sliding member divides the interior of the second shell into a second space and a third space, wherein the first space and the second space are both filled with fluid and are connected through a fluid pipeline, and driven by the negative pressure in the negative pressure chamber, the connecting rod can push the fluid in the first space into the second space through the fluid pipeline, thereby pushing the sliding member to slide in the second shell and squeeze out the liquid medicine in the third space.

[0008] According to the present invention, an infusion device is provided, comprising:

[0009] A negative pressure energy storage mechanism, comprising a first shell and a connecting rod, wherein the connecting rod has a first end and a second end, wherein the first end extends into the interior of the first shell and forms a negative pressure cavity between the first shell;

[0010] The liquid storage mechanism comprises a second shell and a sliding member arranged in the second shell, wherein the sliding member divides the interior of the second shell into a second space and a third space, and the second end portion extends into the second space. Driven by the negative pressure in the negative pressure chamber, the second end portion can move in the second space, thereby pushing the sliding member to slide in the second shell and squeeze out the liquid medicine in the third space.

[0011] Preferably, the first shell and the second shell are an integral piece.

[0012] Preferably, the fluid pipeline is provided with a control component capable of controlling the on-off of the fluid pipeline.

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

[0014] Preferably, a first rotating disk is disposed on the connecting rod via a first rotating shaft, a second rotating disk is disposed on the first shell or the second shell via a second rotating shaft, and the second rotating shaft deviates from the center of the second rotating disk, the first rotating disk contacts the second rotating disk, and when the second rotating disk rotates, the first rotating disk can drive the connecting rod to move in a direction away from the first shell and / or the second shell;

[0015] An arc groove is provided at the end of the second rotating disk, and the arc groove matches the first rotating disk. When the rotation angle of the second rotating disk reaches 180°, the end of the first rotating disk enters the arc groove so that no relative movement is generated between the first rotating disk and the second rotating disk, and the first rotating disk and the second rotating disk are in a locked state.

[0016] Preferably, a partition is arranged on a side of the sliding member facing away from the third space, and one side of the partition, the first end portion and the first shell together form the negative pressure chamber.

[0017] Preferably, a wedge block is provided on the other side of the partition, and the second end is a moving extrusion member. When the external atmospheric pressure drives the connecting rod to move toward the inside of the device, the moving extrusion member rolls or slides along the surface of the wedge block and drives the sliding member to squeeze out the medicine in the third space.

[0018] Preferably, the second space directly stores fluid or holds fluid through a flexible bag, and the third space directly stores liquid medicine or holds 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 can be configured as follows:

[0020] S1<S2<S3;

[0021] S1 = S2 = S3;

[0022] S1>S2>S3;

[0023] S1>S2=S3;

[0024] S1<S2=S3.

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

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

[0027] 1. The infusion device of the present invention can perform stable infusion without the need for the liquid medicine bag to be higher than the patient's body, and has stable pressure, flexible use, no mechanical noise, and has the advantages of small space occupation, no need for suspension, low noise, and portability.

[0028] 2. The driving force of the present invention can be adjusted as needed, the fluid transmission is flexibly arranged, not limited by space, and the fluid pipeline is blocked to achieve locking. Therefore, the driving structure is simple, with fewer components, high reliability and stability, and the starting and stopping of negative pressure movement is simpler and more reliable than the mechanical locking form.

[0029] 3. The present invention can achieve extremely simple structure, efficient direct drive, and high-precision liquid pumping effect regardless of whether it is through fluid or structural parts (wedge-shaped). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 It is a schematic diagram of the structural cross section of Example 1;

[0032] Figure 2 It is a schematic top view of the structure of Example 2;

[0033] Figure 3 is a schematic diagram of the three-dimensional structure of Example 2;

[0034] Figure 4 This is a schematic diagram of the structural disassembly of Example 2;

[0035] Figure 5 It is a side structural schematic diagram of Example 2;

[0036] Figure 6 for Figure 5 Schematic diagram of the AA section;

[0037] Figure 7 It is a front structural schematic diagram of Example 2;

[0038] Figure 8 for Figure 7 Schematic diagram of the cross section along the BB direction;

[0039] Fig. 9 is a schematic diagram of the three-dimensional structure of Example 4;

[0040] Fig.10 This is a schematic diagram of the structural disassembly of Example 4;

[0041] Fig.11 It is a bottom view structural schematic diagram of Embodiment 4;

[0042] Fig.12 It is a side view of Embodiment 4 in one direction;

[0043] Fig.13 for Fig.12 Schematic diagram of the AA section;

[0044] Fig.14 for Fig.12 Schematic diagram of the cross section along the BB direction;

[0045] Fig.15 It is a schematic diagram of the structural cross section of Example 3;

[0046] Fig.16 is a schematic diagram of the three-dimensional structure of Example 3;

[0047] Fig.17 This is a schematic diagram of the structural disassembly of Example 3;

[0048] Fig.18 is a schematic structural diagram of a sliding member in Example 3;

[0049] Fig.19 It is a schematic top view of the structure of Example 3;

[0050] Fig. 20 for Fig.19 Schematic diagram of the cross section along the BB axis. The figure shows:

[0051] Negative pressure energy storage mechanism 1

[0052] First housing 11

[0053] First Space 111

[0054] Negative pressure chamber 112

[0055] Connecting rod 12

[0056] The first end portion 121

[0057] The second end portion 122

[0058] First rotating disk 123

[0059] First shaft 1231

[0060] The second rotating disk 124

[0061] Second rotating shaft 1241

[0062] Arc groove 1242

[0063] Handle 1242

[0064] Liquid storage mechanism 2

[0065] Second housing 21

[0066] Second Space 211

[0067] The Third Space 212

[0068] End cap 213

[0069] Slider 22

[0070] Partition 221

[0071] Wedge block 222

[0072] Fluid pipeline 3

[0073] Control 31 DETAILED DESCRIPTION

[0074] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0075] Embodiment 1:

[0076] The present invention provides an infusion device, such as Figure 1 As shown, it includes a negative pressure energy storage mechanism 1 and a liquid storage mechanism 2. The negative pressure energy storage mechanism 1 has a first shell 11 and a connecting rod 12 whose end can slide in the first shell 11. A negative pressure chamber 112 and a first space 111 are respectively formed between the connecting rod 12 and the first shell 11. The connecting rod 12 is preferably a fixedly connected (such as U-shaped) structure. The connecting rod 12 has a first end 121 and a second end 122, wherein a negative pressure chamber 112 is formed between the first end 121 and the first shell 11, and a first space 111 is formed between the second end 122 and the first shell 11.

[0077] It should be noted that the first shell 11 has a first through hole and a second through hole. The portion of the first end 121 extending to the outside of the first shell 11 passes through the first through hole and cooperates with the gap of the first through hole. On the one hand, it can guide the connecting rod 12. On the other hand, the gap can be connected to the external atmosphere. When the first end 121 slides in the first shell 11, it can play a role in gas flow and will not hinder the movement of the first end 121 in the first shell 11. Similarly, the portion of the second end 122 extending to the outside of the first shell 11 passes through the second through hole and cooperates with the gap of the second through hole. The role of the gap at the second through hole is the same as that of the gap of the first through hole. In addition, when the volume of the negative pressure chamber 112 is 0, the volume of the first space 111 is also 0. At this time, the infusion device is in the initial state. When the connecting rod 12 is pulled to the outside of the first shell 11, the volume of the negative pressure chamber 112 gradually increases until the volume of the negative pressure chamber 112 reaches the maximum when the connecting rod 12 is limited. At this time, the infusion device is in the maximum energy storage state. In actual applications, the maximum volume that the negative pressure chamber 112 of the infusion device can reach can be flexibly set according to the needs of infusion, and a stop limit structure, such as a stop platform, a latch, etc., can be set on the first shell 11 to meet the energy storage requirements of the negative pressure chamber 112.

[0078] Furthermore, the liquid storage mechanism 2 has a second shell 21 and a sliding member 22 arranged in the second shell 21. The sliding member 22 can be a rigid structural member (a plate-like structure or a sheet-like structure) and can form an extrusion movement relative to the third space 212. The sliding member 22 divides the interior 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 connected through the fluid pipeline 3. Driven by the negative pressure in the negative pressure chamber 112, the connecting rod 12 can push the fluid in the first space 111 through the fluid pipeline 3 into the second space 211, thereby pushing the sliding member 22 to slide in the second shell 21 and squeeze out the liquid in the third space 212.

[0079] Specifically, when the infusion device is in the maximum energy storage state, due to the effect of external atmospheric pressure, the connecting rod 12 tends to be pushed into the first shell 11. In order to control the movement of the connecting rod 12, the fluid pipeline 3 is provided with a control member 31 that can control the on and off of the fluid pipeline 3. The control member 31 is preferably a clip, and a valve or the like can also be used. When the control member 31 is closed, the fluid is not allowed to flow in the fluid pipeline 3. Therefore, the fluid in the first space 111 cannot flow out, which is equivalent to locking the connecting rod 12; when the control member 31 is opened, the connecting rod 12 is pushed into the first shell 11 under the drive of external air pressure, thereby pushing the fluid in the first space 111 to flow into the second space 211 through the fluid pipeline 3, and then pushing the sliding member 22 to slide in the second shell 21. At this time, the sliding member 22 squeezes the medicine in the third space 212, and then squeezes out the medicine in the third space 212 to achieve the delivery of the medicine.

[0080] Specifically, the first shell 11 and the second shell 21 are a split structure or an integrated structure, which can be flexibly selected according to the actual application scenario.

[0081] In actual applications, the second space 211 can directly store fluid or contain fluid in a flexible bag. Similarly, the third space 212 can directly store liquid medicine or contain liquid medicine in a flexible bag. The specific selection can be flexibly made according to the actual application scenario.

[0082] 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. The cross-sectional areas of the three spaces can be flexibly designed to meet different infusion requirements. Specifically, they can be set to S1<S2<S3, which can improve the infusion accuracy. The liquid medicine pushed out of the first space 111 with a small cross-sectional area drives the liquid medicine with a large cross-sectional area, that is, the large stroke of the connecting rod 12 can only drive the small stroke of the sliding member 22 to achieve the high-precision force-amplified extrusion movement infusion requirements. In addition, the cross-sectional areas of the three spaces can be set to S1=S2=S3, S1>S2>S3, S1>S2=S3, S1<S2=S3, etc., respectively, to achieve various infusion requirements.

[0083] Embodiment 2:

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

[0085] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the second housing 21 is detachably provided with an end cap 213, and the end cap 213 is preferably configured on the second housing 21 by screwing or snapping, and a third space 212 is formed between the end cap 213 and the sliding member 22. In practical applications, when it is necessary to put the medicine liquid into the third space 212, it is only necessary to remove the end cap 213 by screwing, put the medicine liquid bag into the third space 212, and then screw the end cap 213 onto the second housing 21.

[0086] In this embodiment, the first shell 11 and the second shell 21 are preferably an integral part, and the first shell 11 and the second shell 21 are integrally formed to form a device housing, which is a square structure in a top view. The fluid pipeline 3 can be partially arranged outside the device housing, and a clip is arranged on the fluid pipeline 3, so that the user can open or close the clip at any time to control the progress of the infusion.

[0087] like Figure 4 As shown, a stepped space is provided inside the device housing, one side of the sliding member 22 is a plane, and a third space 212 is formed between the plane and the end cover 213, the other side of the sliding member 22 is a boss, and the boss is a cylindrical boss. The cross section of the sliding member 22 is a T-shaped structure, and the sliding member 22 is circular when viewed from above, and a second space 211 is formed between the cylindrical boss and the device housing. The plane end and the cylindrical boss end of the sliding member 22 form a sliding fit with the upper and lower parts of the stepped space respectively, and the sliding member 22 and the second housing 21 produce a smooth relative motion through the fit of the gaps. It should be noted that if a flexible liquid medicine bag is placed in the third space 212 to hold liquid medicine, the sealing design of the third space 212 does not need to be considered; if the third space 212 is directly filled with liquid medicine, the relative sealing problem of the sliding member 22 and the device housing when sliding needs to be considered, and preferably the circumferential surface of the plane end of the sliding member 22 and the circumferential surface of the cylindrical boss end are both made of sealing material.

[0088] Embodiment 3:

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

[0090] This embodiment provides an infusion device, such as Fig.15As shown, it includes a negative pressure energy storage mechanism 1 and a liquid storage mechanism 2. The negative pressure energy storage mechanism 1 has 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 to the interior of the first shell 11 and forms a negative pressure cavity 112 with the first shell 11; the liquid storage mechanism 2 has a second shell 21 and a sliding member 22 arranged in the second shell 21. The sliding member 22 divides the interior 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. Driven by 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 shell 21 and squeeze out the liquid in the third space 212.

[0091] In this embodiment, Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 As shown, the first shell 11 and the second shell 21 are an integrally formed structure that together form a device housing, and are a square structure when viewed from above.

[0092] Specifically, the device housing is detachably provided with an end cap 213, and the end cap 213 is preferably configured on the second housing 21 by screwing or snapping. A third space 212 is formed between the end cap 213 and the sliding member 22. After the end cap 213 is assembled, the top of the device housing protrudes to form a cylindrical boss, and the bottom is a square structure.

[0093] like Fig.18 , Fig.19 , Fig. 20 As shown, a partition 221 is disposed on one side of the sliding member 22 facing away from the third space 212, and one side of the partition 221, the first end 121 and the first shell 11 together enclose a negative pressure chamber 112. A wedge block 222 is disposed on the other side of the partition 221, and the wedge block 222 is a triangular structure or a trapezoidal structure, and the second end 122 is a moving extrusion member, and the moving extrusion member can slide, roll or roll-slide relative to the wedge block 222. When the external atmospheric pressure drives the connecting rod 12 to move toward the inside of the device housing, the moving extrusion member rolls or slides along the surface of the wedge block 222, and the moving extrusion member moves on the inclined plane and gradually rises, thereby driving the sliding member 22 to move toward the third space 212, and then squeezing out the liquid medicine in the third space 212.

[0094] It should be noted that in this embodiment, a locking structure in the prior art can be used to lock the connecting rod 12, which will not be described in detail here.

[0095] Embodiment 4:

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

[0097] In this embodiment, Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 As shown, a first rotating disk 123 is provided on the connecting rod 12 via a first rotating shaft 1231, and a second rotating disk 124 is provided on the first shell 11 or the second shell 21 via a second rotating shaft 1241, and the second rotating shaft 1241 deviates from the center of the second rotating disk 124. The first rotating disk 123 is in contact with the second rotating disk 124, and when the second rotating disk 124 rotates, the first rotating disk 123 can be driven to drive the connecting rod 12 to move in a direction away from the first shell 11 and / or the second shell 21.

[0098] Specifically, Fig.11 As shown, at this time, the infusion device is in an initial state. When the handle 1242 is pinched to rotate the second rotating disk 124 around the second rotating axis 1241, the first rotating disk 123 will be pressed, so that the first rotating disk 123 drives the connecting rod 12 to move in a direction away from the device housing until the second rotating disk 124 rotates 180°. At this time, the infusion device is in a maximum energy storage state. At this time, the connecting rod 12 can be locked and unlocked when infusion is needed. An arc groove 1242 is provided at the end of the second rotating disk 124, and the arc groove 1242 matches the first rotating disk 123. When the rotation angle of the second rotating disk 124 is close to 180°, the first rotating disk 123 rolls into the arc groove 1242 of the second rotating disk 124. At this time, the axis center of the first rotating shaft 1231, the axis center of the second rotating shaft 1241, and the center point of the circle where the arc groove 1242 is located are on the same straight line, and the line connecting the two axis lines is a straight line, and there is no rotational torque, so that no relative movement is generated between the first rotating disk 123 and the second rotating disk 124, and they are in a locked state. Therefore, in this embodiment, the control component 31 can be omitted, and negative pressure drive locking can be achieved by mechanical means.

[0099] Taking Example 2 as an example, the working principle of the present invention is as follows:

[0100] When infusion is needed, first pull the connecting rod 12 toward the outside of the device housing to adjust the volume of the negative pressure chamber 112 to the maximum, then close the control component 31, then remove the end cover 213, put the medicine bag into the third space 212, and pass the infusion pipeline connected to the medicine bag through the through hole on the device housing to the outside, and then assemble the end cover 213 to the device housing.

[0101] When infusion is needed, the control component 31 is opened. At this time, the connecting rod 12 is pushed into the device housing under the drive of external air pressure, thereby pushing 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 increases and pushes the sliding component 22 to slide in the device housing. At this time, the sliding component 22 squeezes the medicine bag in the third space 212, and then squeezes out the medicine in the third space 212, and transports the medicine to the outside through the infusion pipeline, thereby realizing the medicine delivery operation.

[0102] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0103] The above describes the specific embodiments of the present invention. It should be understood that the present invention 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 essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An infusion device, characterized in that: include: A negative pressure energy storage mechanism (1) comprises a first shell (11) and a connecting rod (12) whose end can slide in the first shell (11), wherein a negative pressure chamber (112) and a first space (111) are respectively formed between the connecting rod (12) and the first shell (11); The liquid storage mechanism (2) comprises a second shell (21) and a sliding member (22) arranged in the second shell (21); the sliding member (22) divides the interior 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 via a fluid pipeline (3); under the drive of the negative pressure in the negative pressure chamber (112), the connecting rod (12) can push the fluid in the first space (111) through the fluid pipeline (3) into the second space (211), thereby pushing the sliding member (22) to slide in the second shell (21) and squeeze out the liquid medicine in the third space (212).

2. An infusion device, characterized in that: include: A negative pressure energy storage mechanism (1) comprises a first shell (11) and a connecting rod (12), wherein the connecting rod (12) comprises a first end (121) and a second end (122), wherein the first end (121) extends into the interior of the first shell (11) and forms a negative pressure chamber (112) with the first shell (11); The liquid storage mechanism (2) comprises a second shell (21) and a sliding member (22) arranged in the second shell (21); the sliding member (22) divides the interior of the second shell (21) into a second space (211) and a third space (212); the second end portion (122) extends into the second space (211); and under the drive of the negative pressure in the negative pressure chamber (112), the second end portion (122) can move in the second space (211), thereby pushing the sliding member (22) to slide in the second shell (21) and squeeze out the liquid medicine in the third space (212).

3. The infusion device according to claim 1 or 2, characterized in that: The first shell (11) and the second shell (21) are an integral part.

4. The infusion device according to claim 1, characterized in that: The fluid pipeline (3) is provided with a control component (31) capable of controlling the on and off of the fluid pipeline (3).

5. The infusion device according to claim 1 or 2, characterized in that: The second shell (21) is detachably provided with an end cover (213), and the third space (212) is formed between the end cover (213) and the sliding member (22).

6. The infusion device according to claim 1 or 2, characterized in that: A first rotating disk (123) is arranged on the connecting rod (12) via a first rotating shaft (1231); a second rotating disk (124) is arranged on the first shell (11) or the second shell (21) via a second rotating shaft (1241), and the second rotating shaft (1241) deviates from the center of the second rotating disk (124); the first rotating disk (123) contacts the second rotating disk (124); when the second rotating disk (124) rotates, the first rotating disk (123) can be driven to drive the connecting rod (12) to move in a direction away from the first shell (11) and / or the second shell (21); The end of the second rotating disk (124) is provided with an arc groove (1242), and the arc groove (1242) matches the first rotating disk (123). When the rotation angle of the second rotating disk (124) reaches 180°, the end of the first rotating disk (123) enters the arc groove (1242), so that the first rotating disk (123) and the second rotating disk (124) do not generate relative movement and are in a locked state.

7. The infusion device according to claim 2, characterized in that: A partition plate (221) is arranged on a side of the sliding member (22) facing away from the third space (212); one side of the partition plate (221), the first end portion (121) and the first shell (11) together form the negative pressure chamber (112).

8. The infusion device according to claim 7, characterized in that: A wedge block (222) is provided on the other side of the partition (221), and the second end portion (122) is a moving extrusion member. When the external atmospheric pressure drives the connecting rod (12) to move toward the inside of the device, the moving extrusion member rolls and / or slides along the surface of the wedge block (222), thereby driving the sliding member (22) to squeeze out the liquid medicine in the third space (212).

9. The infusion device according to claim 1, characterized in that: 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; 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 can be configured as follows: S1<S2<S3; S1 = S2 = S3; S1>S2>S3; S1>S2=S3; S1<S2=S3.

10. The infusion device according to claim 5, characterized in that: The first shell (11) and the second shell (21) are integrally formed to form a device housing, a stepped space is provided inside the device housing, one side of the sliding member (22) is a plane, and the other side is a cylindrical boss, the third space (212) is formed between the plane and the end cover (213), and the second space (211) is formed between the cylindrical boss and the device housing.

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