Infusion pump with self-flowing prevention function
By using a hollow structure built-in spring or torsion spring anti-self-flow device in the infusion pump, the problem of self-flow or blood reflux caused by loose infusion device is solved, and automatic blocking is achieved, improving infusion safety and meeting diverse needs is met. .
Patent Information
- Application Number
- CN202323212036.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-11-28
AI Technical Summary
The existing infusion pump cannot automatically prevent the liquid from flowing by itself or blood backflow when the infusion device and infusion drive device are loose or fall off, which poses safety risks. The existing automatic sealing technology has a single structure and cannot meet different needs.
A infusion pump including a pump head and a pump base is designed, and a hollow structure is built-in spring or torsion spring anti-self-flow device. When the pump head is loose or falls off, the anti-self-flow device automatically seals the infusion pipeline to prevent the liquid from flowing by itself or Blood flows backward.
Effectively preventing the self-flow of the drug liquid or blood backflow, improving the safety of infusion, and meeting the needs of different production companies and hospitals through various embodiments.
Smart Images
Figure CN222130696U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical infusion, in particular to an infusion pump with an anti-self-flow function. Background Art
[0002] The infusion pump is one of the commonly used products in the medical field. It is generally composed of an infusion drive device and an infusion device. It is used for continuous or intermittent infusion of liquid medicine and is used for daily infusion, anesthesia, analgesia, chemotherapy and other disease infusion treatments. It generally has detection and alarm functions such as blockage, bubbles, inadequate clamping, equipment failure and battery power. Although the prior art already has the above-mentioned detection and alarm functions, when the infusion device and the infusion drive device become loose or fall off during the infusion process, the infusion drive device can only issue an alarm and prompt information, and it cannot automatically achieve the effect of preventing self-flow, thereby causing the infusion device to have self-flow of liquid medicine or blood backflow, etc. In severe cases, the excessive infusion of liquid medicine may endanger the patient's life and health. Although some technologies for automatic blocking are currently disclosed, their structure is single and there are few options, which cannot meet the different needs of production companies and hospitals. Utility Model Content
[0003] Based on this, the purpose of the utility model is to provide an infusion pump with an anti-self-flow function to address the deficiencies of the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] An infusion pump with an anti-self-flow function comprises a pump head, a pump base and a medicine box, wherein the pump head consists of a pump head upper cover and a pump head lower cover, the pump head lower cover is slid forward along the mounting surface of the pump base to be buckled, and the medicine box is buckled to the bottom of the pump base; wherein one end of the pump base is convexly arranged upward, and is provided with a pipeline fixing structure for adjusting and fixing the infusion pipeline, and an infusion pipeline positioning is provided on the inner side of the pipeline fixing structure; a hollow structure is provided in the middle position of the pipeline fixing structure, the part where the hollow structure is connected to the inner side of the pipeline fixing structure is the hollow inner side, and the part where the hollow structure is connected to the outer side of the pipeline fixing structure is the hollow outer side; an anti-self-flow device for blocking the infusion pipeline is provided in the hollow structure, and the anti-self-flow device is a spring anti-self-flow device or a torsion spring anti-self-flow device.
[0006] As a further improvement of the utility model, the anti-self-flow device is a spring anti-self-flow device, which includes a spring, an active card and a card structure. One end of the spring is fixed by the active card, and a channel is formed between the card structure and the active card for the infusion pipeline to pass through; when the pump head is installed on the pump base, the outer wall of the lower cover of the pump head is pushed forward to drive the active card on the spring anti-self-flow device to squeeze the spring.
[0007] As a further improvement of the present invention, the anti-self-flow device is a torsion spring anti-self-flow device, which includes a pressure plate, a torsion spring and a latch. The pressure plate includes a transverse portion and a bent portion, a protrusion is provided at the connection between the transverse portion and the bent portion, and a torsion spring notch is provided at one end of the transverse portion away from the bent portion. The transverse portions along both sides of the torsion spring notch are penetrated by the latch and pass through the torsion spring notch, and a torsion spring is sleeved on the latch at the torsion spring notch. The torsion spring is abutted against the hollow outer side and the upper end of the torsion spring notch. When the pump head is installed on the pump base, the outer wall of the lower cover of the pump head is pushed forward to drive the pressure plate on the torsion spring anti-self-flow device to squeeze the torsion spring.
[0008] As a further improvement of the present invention, the hollow inner side is through-type, forming an active card channel for the active card to pass through, and the periphery of the active card channel is provided with a card foot channel that passes through the hollow inner side; the hollow outer side is provided with a spring positioning seat for fixing the other end of the spring.
[0009] As a further improvement of the utility model, one end of the spring is specifically sleeved on the cylindrical protrusion on the movable card, and two clamping plates are extended from the end of the movable card away from the cylindrical protrusion; the clamping structure includes a support plate, and a plurality of clamping feet fixed on the support plate, the clamping feet pass through the clamping foot channels and are limited by the buckles arranged on the clamping feet; the support plate is provided with a concave portion for the clamping plate to pass through.
[0010] As a further improvement of the present invention, the hollow inner side is through-type, forming a card passage for the card structure to pass through; and a pair of card slot limiters arranged opposite to each other are provided on the hollow outer side.
[0011] As a further improvement of the present utility model, one end of the spring is specifically sleeved on the cylindrical protrusion on the movable card, and two clamping strips are extended from the end of the movable card away from the cylindrical protrusion; the clamping structure is a square frame structure, and two clamping strip through holes are arranged on the side close to the hollow inner side, and the clamping strip of the movable card passes through the clamping strip through holes from the inside of the square frame, and a spring positioner is arranged inside the other side of the clamping structure for fixing the other end of the spring, and limiting parts are extended outward from the frame on both sides of the spring position and are arranged to cooperate with the card slot limiting parts; it also includes an L-shaped pin, and the long section of the L-shaped pin passes through the top of the square frame to the bottom end, and passes through the connecting part between the clamping strip and the cylindrical protrusion on the movable card on the way.
[0012] As a further improvement of the present invention, the hollow inner side and the hollow outer side are both through-type, forming a first card passage and a second card passage for the card structure and the movable card to pass through.
[0013] As a further improvement of the present invention, the card structure is provided with an active card slide, and recesses for placing infusion pipelines are supported along both sides of the active card slide; the active card is provided with a bottom sliding part and a top extrusion part that are fixedly connected, and the bottom sliding part as a whole protrudes forward more than the top extrusion part, and a spring limiting groove is provided on the rear side of the bottom end of the bottom sliding part for fixing one end of the spring; it also includes a fixing part fixedly arranged outside the first card channel, and a spring clamping position for fixing the other end of the spring is provided in the fixing part; the displacement channel of the bottom sliding part is an active card slide, and can extend out along the notch at the front end of the active card slide.
[0014] As a further improvement of the present invention, a baffle is provided along the side of the recess away from the fixing member of the clamping structure; an end face is formed along the side of the movable clamping slide close to the fixing member, and a joint is provided on the end face which can be fixed with a circular groove provided on the fixing member; a through hole is also provided on the fixing member, and the fixing member can be fixed to a screw column provided on the outside of the pipeline fixing structure by a screw.
[0015] As a further improvement of the utility model, the inner side of the hollow is through-type, forming a bending portion channel for the bending portion to enter and exit; a latch stop that cooperates with the latch is provided on the inner side of the bottom of the outer side of the hollow, and the horizontal portion on the pressure plate is fitted on the inclined pressure plate stop, and the pressure plate stop is fixed inside the hollow structure; a smooth portion is provided on the top of the pressure plate stop for placing an infusion pipeline, and a pipeline baffle is provided along the side of the smooth portion away from the infusion pipeline.
[0016] The utility model provides a spring anti-self-flow device and a torsion spring anti-self-flow device for an infusion pump. When the infusion device and the infusion drive device become loose or fall off during the infusion process, the infusion pipeline can be quickly blocked, thereby effectively preventing the infusion device from self-flowing or blood backflow, etc. The utility model specifically discloses four embodiments, which can meet the needs of different production companies and hospitals according to production needs and usage needs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Attached Figure 1 This is an assembly diagram of the infusion pump of the utility model.
[0019] Attached Figure 2 This is an exploded view of the infusion pump of the utility model.
[0020] Attached Figure 3 The pump base structure of the utility model embodiment 1 is shown in FIG. Figure 1 .
[0021] Attached Figure 4 The pump base structure of the utility model embodiment 1 is shown in FIG. Figure 2 .
[0022] Attached Figure 5 This is the assembly diagram of the anti-self-flow device of Example 1 of the utility model.
[0023] Attached Figure 6 This is an explosion diagram of the anti-self-flow device of Example 1 of the utility model.
[0024] Attached Figure 7 This is a partial enlargement of the pump base of Example 1 of the utility model Figure 1 .
[0025] Attached Figure 8 This is a partial enlargement of the pump base of Example 1 of the utility model Figure 2 .
[0026] Attached Fig. 9 This is a schematic diagram of the pump base structure of Example 2 of the utility model Figure 1 .
[0027] Attached Fig.10 This is a schematic diagram of the pump base structure of Example 2 of the utility model Figure 2 .
[0028] Attached Fig.11 This is the assembly diagram of the anti-self-flow device of Example 2 of the utility model.
[0029] Attached Fig.12 This is an explosion diagram of the anti-self-flow device of Example 2 of the utility model.
[0030] Attached Fig.13 This is a diagram of the unblocked state of the infusion pipeline of the anti-self-flow device in Example 2 of the utility model.
[0031] Attached Fig.14 This is a diagram showing the blocked state of the infusion pipeline of the anti-self-flow device in Example 2 of the utility model.
[0032] Attached Fig.15 This is a partial enlargement of the pump base of Example 2 of the utility model Figure 1 .
[0033] Attached Fig.16 This is a partial enlargement of the pump base of Example 2 of the utility model Figure 2 .
[0034] Attached Fig.17 This is a schematic diagram of the pump base structure of Example 3 of the utility model Figure 1 .
[0035] Attached Fig.18 This is a schematic diagram of the pump base structure of Example 3 of the utility model Figure 2 .
[0036] Attached Fig.19 This is the assembly diagram of the anti-self-flow device of Example 3 of the utility model.
[0037] Attached Fig. 20 This is an explosion diagram of the anti-self-flow device in Example 3 of the utility model.
[0038] Attached Fig.21 This is a schematic diagram of the structure of the card member in Example 3 of the utility model Figure 1 .
[0039] Attached Fig. 22 This is a schematic diagram of the structure of the card member in Example 3 of the utility model Figure 2 .
[0040] Attached Fig.23 The structure of the activity card of the third embodiment of the utility model is shown in FIG. Figure 1 .
[0041] Attached Fig.24 The structure of the activity card of the third embodiment of the utility model is shown in FIG. Figure 2 .
[0042] Attached Fig.25 This is a schematic diagram of the fixing structure of Example 3 of the utility model.
[0043] Attached Fig.26 This is a partial enlarged view of the pump base of Example 3 of the utility model.
[0044] Attached Fig. 27 This is the pump base structure and partial enlarged view of Example 4 of the utility model.
[0045] Attached Fig.28 This is the assembly diagram of the anti-self-flow device of Example 4 of the utility model.
[0046] Attached Fig.29 This is a partial enlargement of the pump base of Example 4 of the utility model Figure 1 .
[0047] Attached Fig.30 This is a partial enlargement of the pump base of Example 4 of the utility model Figure 2 . Implementation
[0048] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0049] like Figure 1-30 As shown, an infusion pump with an anti-self-flow function includes a pump head 1, a pump base 2 and a medicine box 3. The pump head 1 is composed of a pump head upper cover 11 and a pump head lower cover 12. The medicine box 3 is buckled to the bottom of the pump base 2. One end of the pump base 2 is convexly arranged to form a pipeline fixing structure 21 for adjusting and fixing the infusion pipeline 6. The inner side of the pipeline fixing structure 21 is provided with an infusion pipeline positioning 213. A hollow structure 22 is provided in the middle of the pipeline fixing structure 21. The part where the hollow structure 22 is connected to the inner side of the pipeline fixing structure 21 is the hollow inner side 212, and the part where the hollow structure 22 is connected to the outer side of the pipeline fixing structure 21 is the hollow outer side 211; the hollow structure 22 is provided with an anti-self-flow device for blocking the infusion pipeline 6, and the anti-self-flow device is a spring anti-self-flow device 4 or a torsion spring anti-self-flow device 5. Embodiment 1:
[0050] like Figure 3-8 As shown, the anti-self-flow device is a spring anti-self-flow device 4, which includes a spring 41, an active card 42 and a card structure 43. One end of the spring 41 is limited and fixed by the active card 42, and a channel is formed between the card structure 43 and the active card 42 for the infusion pipeline 6 to pass through; when the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head is pushed forward to drive the active card 42 on the spring anti-self-flow device 4 to squeeze the spring 41.
[0051] Furthermore, the hollow inner side 212 is through-type, forming an active card channel 2121 for the active card 42 to pass through, and the periphery of the active card channel 2121 is provided with a foot channel 2122 that passes through the hollow inner side 212; the hollow outer side 211 is provided with a spring positioning seat 2111 for fixing the other end of the spring 41. One end of the spring 41 is specifically sleeved on the cylindrical protrusion 421 on the active card 42, and two clamping plates 422 extend from one end of the active card 42 away from the cylindrical protrusion 421; the clamping structure 43 includes a support plate 431, and a plurality of clamping feet 432 fixed on the support plate 431, the clamping feet 432 pass through the foot channel 2122, and are limited by the undercut 4321 provided on the clamping feet 432; the support plate 431 is provided with a concave portion 4311 for the clamping plate 422 to pass through.
[0052] Specifically, when the pump head 1 is not installed on the pump base 2, the spring 41 is in a slightly compressed or uncompressed jacking state, and at this time, the two card plates 422 on the movable card 42 are pushed forward to cross the concave portion 4311, so that the connection portion between the two card plates 422 forms an extrusion and blocking operation on the infusion pipeline 6. When the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head pushes forward to drive the two card plates 422 to move and squeeze the spring 41, and the movable card 42 moves backward to release the extrusion and blockage of the infusion pipeline 6, and the liquid can flow out of the medicine bag normally. Therefore, when the pump head 1 becomes loose or slips off, the reverse elastic force of the spring 41 drives the movable card 42 to move, and the anti-self-flow device spontaneously performs a blocking operation. Embodiment 2:
[0053] like Figure 9-16 As shown, the anti-self-flow device is a spring anti-self-flow device 4, which includes a spring 41, an active card 42 and a card structure 43. One end of the spring 41 is limited and fixed by the active card 42, and a channel is formed between the card structure 43 and the active card 42 for the infusion pipeline 6 to pass through; when the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head is pushed forward to drive the active card 42 on the spring anti-self-flow device 4 to squeeze the spring 41.
[0054] Furthermore, the hollow inner side 212 is through-type, forming a clamping passage 2123 for the clamping structure 43 to pass through; a pair of clamping slot limiters 2112 arranged opposite to each other are provided on the hollow outer side 211 . One end of the spring 41 is specifically sleeved on the cylindrical protrusion 421 on the movable card 42, and two clamping strips 423 are extended from one end of the movable card 42 away from the cylindrical protrusion 421; the clamping structure 43 is a square frame structure, and two clamping strip through holes 433 are arranged on the side close to the hollow inner side 212, and the clamping strip 423 of the movable card 42 passes through the clamping strip through holes 433 from the inside of the square frame, and a spring positioning 434 is arranged inside the other side of the clamping structure 43 for fixing the other end of the spring 41, and limiting portions 435 arranged in cooperation with the card slot limiting piece 2112 are extended outward on the frame on both sides of the spring positioning 434; it also includes an L-shaped pin 44, and the long section of the L-shaped pin 44 passes through the top to the bottom of the square frame, and passes through the connecting part between the clamping strip 423 and the cylindrical protrusion 421 on the movable card 42 on the way.
[0055] Specifically, when the pump head 1 is not installed on the pump base 2, the spring 41 is in a slightly compressed or uncompressed jacking state, and at this time, the two clamping strips 423 on the movable clamp 42 are pushed forward through the clamping strip through hole 433, so that the connection between the two clamping strips 423 forms an extrusion and blocking operation on the infusion pipeline 6. When the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head pushes forward to drive the two clamping strips 423 to move and squeeze the spring 41, and the movable clamp 42 moves backward to release the extrusion and blockage of the infusion pipeline 6, and the liquid can flow out of the medicine bag normally. Therefore, when the pump head 1 is loose or slips off, the anti-self-flow device will spontaneously perform a blocking operation.
[0056] As a preferred embodiment, a limit mode of the anti-self-flow device is designed to facilitate the loading and unloading of the infusion pipeline 6. After the spring 41 and the movable card 42 are installed in the square frame, the two clamping strips 423 are squeezed to align the latch hole on the square frame with the latch hole on the movable card 42, and then the L-shaped latch 44 is inserted, leaving enough space for inserting the infusion pipeline 6. Embodiment 3:
[0057] like Figure 17-26 As shown, the anti-self-flow device is a spring anti-self-flow device 4, which includes a spring 41, an active card 42 and a card structure 43. One end of the spring 41 is limited and fixed by the active card 42, and a channel is formed between the card structure 43 and the active card 42 for the infusion pipeline 6 to pass through; when the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head is pushed forward to drive the active card 42 on the spring anti-self-flow device 4 to squeeze the spring 41.
[0058] Furthermore, the hollow inner side 212 and the hollow outer side 211 are through-type, forming a first clamp channel 2113 and a second clamp channel 2124 for the clamp structure 43 and the movable clamp 42 to pass through. The clamp structure 43 is provided with an movable clamp slideway 436, and recesses 437 for placing the infusion pipeline 6 are supported along both sides of the movable clamp slideway 436; the movable clamp 42 is provided with a bottom sliding member 424 and a top extrusion member 425 that are fixedly connected, and the bottom sliding member 424 as a whole protrudes forward than the top extrusion member 425, and a spring stopper groove 426 is provided at the rear side of the bottom end of the bottom sliding member 424 for fixing one end of the spring 41; it also includes a fixing member 45 fixedly arranged outside the first clamp channel 2113, and a spring stopper 452 for fixing the other end of the spring 41 is provided in the fixing member 45; the displacement channel of the bottom sliding member 424 is the movable clamp slideway 436, and can extend along the notch 438 at the front end of the movable clamp slideway 436. A baffle 439 is provided on the side of the clamping structure 43 along the recess 437 away from the fixing member 45; an end face 4310 is formed on the side of the clamping structure 43 along the movable clamping slide 436 close to the fixing member 45, and a joint 4311 is provided on the end face 4310 which can be fixed with a circular groove 451 provided on the fixing member 45; a through hole 453 is also provided on the fixing member 45, and the fixing member 45 can be fixed to the screw column 214 provided on the outside of the pipeline fixing structure 21 by a screw 46.
[0059] Specifically, when the pump head 1 is not installed on the pump base 2, the spring 41 is in a slightly compressed or uncompressed jacking state, and at this time, the bottom sliding member 424 on the movable card 42 is pushed forward through the notch 438, so that the top extrusion member 425 is pushed forward to squeeze and block the infusion pipeline 6. When the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head is pushed forward to drive the bottom sliding member 424 to move and squeeze the spring 41, and the movable card 42 moves backward to release the squeeze and block the infusion pipeline 6, and the liquid can flow out of the medicine bag normally. Therefore, when the pump head 1 is loose or slipped, the anti-self-flow device will spontaneously perform a blocking operation. Embodiment 4:
[0060] like Figure 27-30 As shown, the anti-self-flow device is a torsion spring anti-self-flow device 5, which includes a pressure plate 51, a torsion spring 52 and a latch 53. The pressure plate 51 includes a transverse portion 511 and a bent portion 512. A protrusion 513 is provided at the connection between the transverse portion 511 and the bent portion 512. A torsion spring notch 514 is provided at one end of the transverse portion 511 away from the bent portion 512. The transverse portions 511 along both sides of the torsion spring notch 514 are penetrated by the latch 53 and pass through the torsion spring notch 514, and a torsion spring 52 is sleeved on the latch 53 at the torsion spring notch 514. The torsion spring 52 is abutted against the hollow outer side 211 and the upper end of the torsion spring notch 514. When the pump head 1 is installed on the pump base 2, the outer wall 121 of the pump head lower cover pushes forward to drive the pressure plate 51 on the torsion spring anti-self-flow device 5 to squeeze the torsion spring 52.
[0061] Furthermore, the hollow inner side 212 is of a through-type, forming a bending portion channel 2125 for the bending portion 512 to enter and exit; a latch stop 2114 cooperating with the latch 53 is provided on the inner side of the bottom of the hollow outer side 211, and the transverse portion 511 on the pressure plate 51 is attached to the inclined pressure plate stop 54, and the pressure plate stop 54 is fixed inside the hollow structure 22; a smooth portion 55 is provided at the top of the pressure plate stop 54 for placing the infusion pipeline 6, and a pipeline baffle 56 is provided along the side of the smooth portion 55 away from the infusion pipeline 6.
[0062] Specifically, when the pump head 1 is not installed on the pump base 2, the torsion spring 52 is in a slightly compressed or uncompressed state. At this time, the bent portion 512 on the pressure plate 51 passes through the bent portion channel 2125 and extends over the top of the pipeline baffle 56. The transverse portion 511 fits on the pressure plate stop 54, and the protrusion 513 squeezes and blocks the infusion pipeline 6 on the smooth portion 55. When the pump head 1 is installed on the pump base 2, the outer wall 121 of the lower cover of the pump head drives the entire pressure plate 51 to deflect by pushing the bent portion 512 forward, so that the torsion spring 52 is compressed, and the protrusion 513 partially moves backward to release the squeeze and blockage of the infusion pipeline 6, and the liquid can flow out of the medicine bag normally. Therefore, when the pump head 1 is loose or slips off, the torsion spring 52 pushes the pressure plate 51 back in the opposite direction, and the anti-self-flow device spontaneously performs a blocking operation.
[0063] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.
Claims
1. An infusion pump with an anti-self-flow function, comprising a pump head, a pump base and a medicine box, wherein the pump head is composed of an upper cover of the pump head and a lower cover of the pump head, the lower cover of the pump head is slid forward along the mounting surface of the pump base to be buckled, and the medicine box is buckled to the bottom of the pump base; wherein one end of the pump base is convexly arranged upward, and is provided with a pipeline fixing structure for adjusting and fixing the infusion pipeline, and an infusion pipeline positioning is provided inside the pipeline fixing structure; characterized in that, A hollow structure is provided in the middle position of the pipeline fixing structure, the part where the hollow structure is connected to the inner side of the pipeline fixing structure is the hollow inner side, and the part where the hollow structure is connected to the outer side of the pipeline fixing structure is the hollow outer side; an anti-self-flow device for blocking the infusion pipeline is provided in the hollow structure, and the anti-self-flow device is a spring anti-self-flow device or a torsion spring anti-self-flow device.
2. The infusion pump with anti-self-flow function according to claim 1, characterized in that: The anti-self-flow device is a spring anti-self-flow device, which includes a spring, an active card and a card structure. One end of the spring is fixed by the active card, and a channel for the infusion pipeline to pass through is formed between the card structure and the active card. When the pump head is installed on the pump base, the outer wall of the lower cover of the pump head is pushed forward to drive the active card on the spring anti-self-flow device to squeeze the spring.
3. The infusion pump with anti-self-flow function according to claim 1, characterized in that: The anti-self-flow device is a torsion spring anti-self-flow device, which includes a pressure plate, a torsion spring and a latch. The pressure plate includes a transverse portion and a bent portion, a protrusion is provided at the connection between the transverse portion and the bent portion, and a torsion spring notch is provided at one end of the transverse portion away from the bent portion. The transverse portions along both sides of the torsion spring notch are penetrated by the latch and pass through the torsion spring notch, and a torsion spring is sleeved on the latch at the torsion spring notch. The torsion spring is abutted against the hollow outer side and the upper end of the torsion spring notch. When the pump head is installed on the pump base, the outer wall of the lower cover of the pump head is pushed forward to drive the pressure plate on the torsion spring anti-self-flow device to squeeze the torsion spring.
4. The infusion pump with anti-self-flow function according to claim 2, characterized in that: The hollow inner side is through-type, forming an active card channel for the active card to pass through, and the periphery of the active card channel is provided with a card foot channel that passes through the hollow inner side; the hollow outer side is provided with a spring positioning seat for fixing the other end of the spring.
5. The infusion pump with anti-self-flow function according to claim 4, characterized in that: One end of the spring is specifically sleeved on the cylindrical protrusion on the movable card, and two clamping plates are extended from one end of the movable card away from the cylindrical protrusion; the clamping structure includes a support plate, and a plurality of clamping feet fixed on the support plate, the clamping feet pass through the clamping foot channels and are limited by the buckles arranged on the clamping feet; a concave portion is provided on the support plate for the clamping plate to pass through.
6. The infusion pump with anti-self-flow function according to claim 2, characterized in that: The hollow inner side is through-type, forming a card passage for the card structure to pass through; a pair of card slot limiters arranged opposite to each other are provided on the hollow outer side.
7. The infusion pump with anti-self-flow function according to claim 6, characterized in that: One end of the spring is specifically sleeved on the cylindrical protrusion on the movable card, and two clamping strips are extended from one end of the movable card away from the cylindrical protrusion; the clamping structure is a square frame structure, and two clamping strip through holes are arranged on one side close to the hollow inner side, and the clamping strip of the movable card passes through the clamping strip through holes from the inside of the square frame, and a spring positioner is arranged inside the other side of the clamping structure for fixing the other end of the spring, and limiting parts are extended outward from the frame on both sides of the spring position and are arranged to cooperate with the card slot limiting parts; it also includes an L-shaped pin, and the long section of the L-shaped pin passes through the top end of the square frame to the bottom end, and passes through the connecting part between the clamping strip and the cylindrical protrusion on the movable card on the way.
8. The infusion pump with anti-self-flow function according to claim 2, characterized in that: The hollow inner side and the hollow outer side are both through-type, forming a first card passage and a second card passage for the card structure and the movable card to pass through.
9. The infusion pump with anti-self-flow function according to claim 8, characterized in that: The card structure is provided with an active card slide, and recesses for placing infusion pipelines are supported along both sides of the active card slide; the active card is provided with a bottom sliding part and a top extrusion part that are fixedly connected, and the bottom sliding part as a whole protrudes forward than the top extrusion part, and a spring limiting groove is provided on the rear side of the bottom end of the bottom sliding part for fixing one end of the spring; it also includes a fixing part fixedly arranged outside the first card channel, and a spring clamping position for fixing the other end of the spring is provided in the fixing part; the displacement channel of the bottom sliding part is the active card slide, and can extend out along the notch at the front end of the active card slide.
10. The infusion pump with anti-self-flow function according to claim 9, characterized in that: The clamping structure is provided with a baffle along the side of the recess away from the fixing part; the clamping structure forms an end face along the side of the movable clamping slide close to the fixing part, and a joint is provided on the end face which can be fixed with the circular groove provided on the fixing part; the fixing part is also provided with a through hole, and the fixing part can be fixed to the screw column provided on the outside of the pipeline fixing structure by screws.
11. The infusion pump with anti-self-flow function according to claim 3, characterized in that: The inner side of the hollow is through-type, forming a bending portion channel for the bending portion to enter and exit; a latch stop that cooperates with the latch is provided on the inner side of the bottom of the outer side of the hollow, and the horizontal part on the pressure plate is attached to the inclined pressure plate stop, and the pressure plate stop is fixed inside the hollow structure; a smooth part is provided on the top of the pressure plate stop for placing an infusion pipeline, and a pipeline baffle is provided along the side of the smooth part away from the infusion pipeline.