An infusion pump

Abstract

An infusion pump, comprising a pump body and a liquid storage cylinder with a medicine liquid, the pump body comprises a shell, a push rod assembly located in the shell and a connecting part fixed to one end of the shell; the shell is detachably connected with the liquid storage cylinder through the connecting part, and the push rod assembly is used to push a sealing assembly in the liquid storage cylinder to move to make the medicine liquid discharge; the connecting part comprises a base and a plurality of clamping grooves, the liquid storage cylinder comprises a cylinder body and a flange matched and connected with each clamping groove one by one; the liquid storage cylinder is in a rotating manner, and the connecting flange is screwed into or out of the corresponding clamping groove. The utility model can reduce the operation difficulty of frequent replacement of the liquid storage cylinder, improve the replacement efficiency of the liquid storage cylinder, and also avoid the pollution of the medicine liquid in the liquid storage cylinder during installation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an infusion pump. Background Technology

[0002] Compared to manual operation by medical staff, the use of infusion pumps offers significant advantages in terms of safety, reliability, and reduced labor intensity. However, in current technology, infusion pumps typically consist of a reservoir and a pump body, with the reservoir usually housed within the pump body; alternatively, the reservoir and pump body are connected via traditional threads. When frequent replacement of disposable reservoirs is required, removing the old reservoir after each infusion and installing the new one is inconvenient, and the frequent disassembly and reassembly of the threads can compromise reliability. Furthermore, in some infusion pumps, the plunger rod is integrated with the plunger head of the reservoir; when replacing the reservoir, the exposed plunger head is susceptible to contamination, further increasing the operational difficulty and hygiene risks during frequent replacements. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide an infusion pump that allows for frequent replacement of the storage tank, thereby reducing the difficulty of operation.

[0004] This utility model proposes an infusion pump, including a pump body and a reservoir containing a medicinal solution. The pump body includes a housing, a push rod assembly located inside the housing, and a connecting part fixed to one end of the housing. The housing is detachably connected to the reservoir via the connecting part, and the push rod assembly is used to push a sealing assembly inside the reservoir to move so that the medicinal solution is discharged. The connecting part includes a base and multiple slots. The reservoir includes a cylinder and connecting flanges that correspond to each slot. The reservoir can be rotated to cause the connecting flanges to screw into or out of the corresponding slots.

[0005] Preferably, the slot includes a locking slot and a flared slot; the locking slot is used to interfere with the connecting flange, and the flared slot is used to guide the connecting flange into the locking slot.

[0006] Preferably, the flared slot has a guide groove at the end away from the locking slot; the guide groove is clearance-fitted with the flange, and the guide groove has an opening at the end away from the flared slot for the connecting flange to enter.

[0007] Preferably, the top wall and / or side wall of the card slot are provided with observation ports.

[0008] Preferably, it also includes an external pull rod, the end of which is detachably connected to the sealing component inside the drug-free liquid storage cylinder to form a liquid suction component for liquid suction and air release before infusion.

[0009] Preferably, the push rod assembly includes a sleeve, a drive screw, and a push rod; both the push rod and the drive screw are located inside the sleeve, and the push rod is threaded onto the outside of the drive screw; a circumferential limiting structure is provided between the push rod and the sleeve.

[0010] Preferably, the push rod assembly further includes an abutment for pushing the sealing assembly, the abutment being disposed on the push rod at one end away from the drive screw, for pushing the sealing assembly to drain liquid.

[0011] Preferably, the base has a through hole along the axial direction of the sleeve for the end of the push rod to pass through.

[0012] Preferably, the end of the sleeve is provided with a groove, and the bottom of the base is fixed with a protrusion for the push rod to pass through. The protrusion is coaxially arranged with the through hole and is inserted into the groove, so that the sleeve is in a sealed state.

[0013] Preferably, the pump body further includes a drive device and a battery, and the drive device is used to drive the lead screw to rotate; the drive device and the battery are arranged inside the housing, and the drive device and the battery are located on both sides of the push rod assembly to balance the weight of the pump body.

[0014] As described above, the infusion pump of this utility model has the following beneficial effects:

[0015] This invention requires the installation of a disposable medicine storage cylinder by rotating it so that the flange screws into the corresponding slot. Then, a push rod assembly pushes the sealing component inside the cylinder to discharge the medicine. After the medicine is infused, the storage cylinder is rotated in the reverse direction of installation to unscrew the flange from the slot, allowing the cylinder to be removed and replaced with a new one for the next infusion. This process is repeated to achieve frequent storage cylinder replacement. This invention reduces the operational difficulty of frequent storage cylinder replacement, improves the efficiency of storage cylinder replacement, and also prevents contamination of the medicine inside the storage cylinder during installation.

[0016] After a single infusion of medication, the original storage cylinder needs to be removed and replaced with a new one containing the medication. The preferred method for obtaining the new storage cylinder is to detachably connect an external pull rod to the sealing component inside the disposable storage cylinder to form a suction assembly. After the suction assembly draws in the preset dose of medication, the external pull rod is removed, thus obtaining the storage cylinder containing the required dose. Compared to factory-pre-sealed, pre-quantitative storage cylinders, this method flexibly meets the user's different dosage needs and reduces medication waste.

[0017] The drive device and battery are located on opposite sides of the push rod assembly inside the housing, which can effectively balance the weight of the pump body.

[0018] This utility model features a support base on its housing, with multiple limiting grooves on the support base. One end of the sleeve is fixed to the drive device housing by bolts, and the sleeve body engages within the limiting grooves. On one hand, the rotation of the lead screw drives the push rod to apply a radial force to the sleeve, causing the bolt at the sleeve to bear a large torsional force. The limiting grooves effectively distribute the force on the bolt at the sleeve, preventing bolt breakage and ensuring the stability of the sleeve's fixation. On the other hand, the compact internal space of the housing prevents interference between the sleeve and other components, improving installation convenience. Furthermore, the support base, positioned between the housing sidewall and the sleeve, effectively increases the overall compressive strength of the housing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly of the infusion pump provided in an embodiment of the present utility model.

[0020] Figure 2 An exploded view of the infusion pump provided by this utility model.

[0021] Figure 3 A schematic diagram of the structure of the liquid storage cylinder provided by this utility model.

[0022] Figure 4 A front view of the infusion pump provided in an embodiment of this utility model.

[0023] Figure 5 A cross-sectional view of the infusion pump provided in an embodiment of this utility model.

[0024] Figure 6 for Figure 5 A magnified view of section II in the middle.

[0025] Figure 7 This is a schematic diagram of the connecting part provided in an embodiment of the present utility model.

[0026] Figure 8 for Figure 7 Top view.

[0027] Figure 9 for Figure 8 BB cross-sectional view.

[0028] Figure 10 for Figure 8 CC section view.

[0029] Figure 11 for Figure 10 A magnified view of section II in the middle.

[0030] Figure 12 for Figure 7 Side view.

[0031] Figure 13 This is a schematic diagram of the internal structure of the pump body provided in an embodiment of the present utility model.

[0032] Figure 14 A partial cross-sectional view of the internal structure of the pump body provided in an embodiment of this utility model.

[0033] Figure 15 An exploded view of the sleeve and shell provided in an embodiment of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Pump body; 110. Housing; 120. Push rod assembly; 121. Sleeve; 122. Drive screw; 123. Push rod; 124. Abutment part; 130. Connecting part; 131. Base; 132. Slot; 1321. Locking slot; 1322. Flared slot; 1323. Guide slot; 1324. Opening; 1325. Observation window; 133. Through hole; 134. Protrusion; 140. Drive device; 150. Battery; 160. Circumferential limiting structure; 200. Liquid storage tank; 210. Cylinder body; 220. Connecting flange; 300. Sealing assembly; 310. Blind hole; 400. Support base; 410. Limiting groove. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0037] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms used in this specification, such as "upper," "lower," "left," "right," and "middle," are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0038] like Figures 1 to 14As shown, an embodiment of an infusion pump includes a pump body 100 and a reservoir 200 containing a medicinal solution. The reservoir 200 is disposed outside the pump body 100, and the pump body 100 and the reservoir 200 are detachably connected. The pump body 100 includes a housing 110, a push rod assembly 120 located within the housing 110, and a connecting portion 130 fixed to one end of the housing 110. Preferably, the housing 110 is connected to the reservoir 200 via the connecting portion 130, and this connection method is preferably a snap-fit ​​connection to facilitate frequent disassembly and replacement of the reservoir 200. The push rod assembly 120 is connected to a drive device. Under the drive of the drive device, the end of the push rod assembly 120 passes through the connecting portion 130 to push the sealing assembly 300 inside the reservoir to move, thereby discharging the medicinal solution. The connecting portion 130 includes a base 131 and a plurality of slots 132. Preferably, the number of slots 132 is two, and the two slots 132 are centrally symmetrical. The liquid storage cylinder 200 includes a cylinder body 210 and a connecting flange 220 that corresponds to each slot 132. The liquid storage cylinder 200 is rotated so that the connecting flange 220 is screwed into the corresponding slot 132. When disassembling, the liquid storage cylinder 200 can be removed by rotating it in the opposite direction of the screwing direction.

[0039] It should be noted that in this embodiment, the storage cylinder 200 is disposable. After a single drug infusion is completed, the original storage cylinder needs to be removed. If drug infusion is required again, a new storage cylinder pre-filled with drug solution is installed on the pump body to facilitate the next drug infusion. A clearance space is also provided between the slots 132 for the installation of the storage cylinder to avoid interference between the cylinder body 210 and the outer wall of the slot 132 during the rotation and locking process.

[0040] It should be noted that the new pre-filled medication reservoir is either factory-filled or can be filled by the user according to their needs. When filling, the user can connect the external pull rod to the sealing component 300 inside the reservoir. According to the dosage requirements, the external pull rod can be moved to a predetermined position to complete liquid aspiration and venting. The user can then attach the filled reservoir to the pump body to prepare for medication infusion.

[0041] Before administering the medication, the operator aligns the central axis of the medication reservoir 200 with the connecting part 130, ensuring the connecting flange 220 is offset from the corresponding slot 132 at a certain angle to avoid interference with the outer wall of the slot 132. The reservoir 200 is rotated until the connecting flange 220 enters the slot 132 and locks in place. The push rod assembly is then driven by a drive device, causing its end to act on the sealing assembly 300 inside the reservoir, moving it and thus discharging the medication. Once the medication in the reservoir 200 is completely drained, the operator rotates the reservoir 200 in the opposite direction to the direction in which the connecting flange 220 enters the slot 132, disengaging the connecting flange 220 from the slot 132 and separating the reservoir 200 from the pump body 100. For multiple medication infusions, the above steps can be repeated, facilitating the replacement of the reservoir 200 and improving assembly / disassembly efficiency.

[0042] In one embodiment, such as Figures 9 to 11 As shown, the slot 132 includes a locking slot 1321 and a flared slot 1322. The locking slot 1321 is used for an interference fit with the connecting flange 220, and the flared slot 1322 is used to guide the connecting flange 220 into the locking slot 1321. In this embodiment, the connecting flange 220 has a certain elasticity. When the liquid storage cylinder 200 is engaged with the connecting part 130, the rotating cylinder 210 drives the connecting flange 220 to rotate circumferentially, causing the connecting flange 220 to enter the flared slot 1322. Since the flared slot 1322 is inclined at a certain angle, and the connection between the flared slot 1322 and the locking slot 1321 is transitioned by an arc, the fit relationship gradually transitions from a clearance fit to an interference fit as the connecting flange 220 enters the locking slot 1321 along the flared slot 1322, thereby achieving the locking function.

[0043] In one embodiment, such as Figure 10 As shown, in a preferred embodiment, the flared slot 1322 has a guide groove 1323 at the end away from the locking slot 1321. The guide groove 1323 is in clearance fit with the flange 220. The guide groove 1323 has an opening 1324 at the end away from the flared slot 1322 for the connecting flange 220 to enter. When it is necessary to install the liquid storage cylinder, rotating the cylinder 210 drives the slot 1322 to enter from the opening 1324. The connecting flange 220 is guided into the flared slot 1322 through the guide groove 1323, so that the connecting flange 220 gradually transitions from clearance fit to interference fit under the action of the flared slot 1322.

[0044] Furthermore, such as Figure 7 and Figure 8 As shown, the top wall and / or side wall of the slot 132 are provided with an observation port 1325 to observe the engagement between the connecting flange 220 and the slot 112, and to determine whether the connecting flange 220 is engaged properly.

[0045] In one embodiment, the infusion pump further includes a disposable reservoir and an external pull rod (not shown in the figure). The end of the external pull rod is detachably connected to the sealing assembly 300 inside the disposable reservoir to form a liquid suction assembly. This detachable connection includes, but is not limited to, snap-fit, threaded connection, and plug-in connection. As a preferred embodiment, this embodiment uses a threaded connection. When there is no drug infusion cylinder and liquid needs to be drawn to form a pre-filled reservoir, the external pull rod can be threadedly connected to the sealing assembly 300. The user can pull the external pull rod outwards according to the required dosage of the drug to be drawn, completing the liquid suction and air release before infusion. Removing the external pull rod yields the reservoir 200 containing the drug, thus reducing drug waste.

[0046] In one embodiment, such as Figure 6 and Figure 13 As shown, the push rod assembly 120 includes a sleeve 121, a drive screw 122, and a push rod 123. Both the push rod 123 and the drive screw 122 are located inside the sleeve 121, and the push rod 123 is threaded onto the drive screw 122. The push rod 123 can move axially under the drive of the drive screw 122. A circumferential limiting structure 160 is provided between the push rod 123 and the sleeve 121, located at the end of the push rod 123 near the drive device. In a preferred embodiment, the push rod 123 has a rounded rectangular cross-section, and the sleeve 121 also has a corresponding rounded rectangular mounting structure to prevent the push rod 123 from rotating when the drive screw 122 rotates. In use, driven by the drive device, the drive screw 122 rotates, causing the push rod 123 to move axially, and the end of the push rod 123 pushes the sealing assembly 300 to complete the discharge of the medicine.

[0047] In one embodiment, such as Figure 13 and Figure 14 As shown, the push rod assembly 120 also includes an abutment 124 for pushing the sealing assembly, with one end of the abutment 124 disposed on the push rod 123. The abutment 124 has a through hole. During installation, the abutment 124 is sleeved on the end of the push rod 123, and an interference fit is used between the abutment 124 and the push rod 123 to fix the abutment 124 on the push rod 123. Driven by the drive screw 122, the push rod 123 drives the abutment 124 to abut against the sealing assembly 300 axially, thereby pushing the sealing assembly 300 to achieve drug infusion.

[0048] As another preferred embodiment, the sealing assembly 300 in this embodiment has a blind hole 310 facing the opening of the cylinder 210. The blind hole 310 has an internal thread, which can be used for threaded connection with the external pull rod described above. The cross-sectional area of ​​the non-connecting end of the abutment member 124 is smaller than the diameter of the blind hole 310. Since the piston seal 400 is generally made of rubber, when the push rod is thin, if the pressure applied directly to the bottom wall of the blind hole is large, it will cause large deformation of the central part of the piston seal. Connecting the end of the push rod to this abutment member increases the force-bearing area, thereby effectively reducing the pressure on the bottom wall of the blind hole and reducing the deformation at the blind hole of the piston seal.

[0049] In some embodiments, such as Figure 6 and Figure 14 As shown, the base 131 has a through hole 133 along the axial direction of the sleeve 121 for the end of the push rod 120 to pass through. During assembly, after the end of the push rod 120 passes through the through hole 133, the push rod 120 is then fixedly connected to the abutment member 124. When the push rod 120 drives the abutment member 124 into the blind hole 310 to push the sealing assembly 300 to move as a whole, completing the drug infusion, the drive screw 122 rotates in the reverse direction, causing the push rod to move axially, and the push rod body returns to the housing 110. At this time, driven by the push rod, the abutment member 124 abuts against the base 131, ensuring that the push rod accurately returns to its initial position.

[0050] In one embodiment, such as Figure 6 As shown, the sleeve 121 has a groove 1211 at its end, and the base 131 has a protrusion 134 for the push rod to pass through fixedly at its bottom. The protrusion 134 is coaxially arranged with the through hole 133. It can be understood that the through hole 133 extends from the base 131 to the protrusion 134. During installation, the protrusion 134 is inserted into the groove 1211, and the protrusion 134 and the groove 1211 are in an interference fit, so that the sleeve 121 is in a sealed state, preventing external dust from entering the sleeve.

[0051] In one embodiment, such as Figure 13 As shown, the pump body 100 also includes a drive unit 140 and a battery 150. The drive unit 140 and battery 150 are arranged inside the housing 110. The drive unit 140 and battery 150 are located on opposite sides of the push rod assembly 120 to balance the weight of the pump body. In a preferred embodiment, the drive unit 140 includes a drive motor and a reduction gear. The reduction gear is located inside a housing on one side of the push rod assembly 120, while the drive motor is located outside the housing. Its drive shaft is connected to the reduction gear inside the housing, making the internal layout of the housing more compact and improving the utilization rate of the internal space of the housing.

[0052] In one embodiment, such as Figure 15As shown, a support seat 400 for supporting the sleeve 121 is provided inside the housing 110 along the axial direction of the output shaft of the drive device. The support seat 400 has multiple limiting grooves 410 along the axial direction for limiting the sleeve. One end of the sleeve 121 is fixed to the housing of the drive device by bolts, and the sleeve body is engaged within the limiting grooves 410. During operation, the rotation of the drive screw 123 will cause the push rod 123 to apply a radial force to the sleeve 121. The limiting grooves 410 can effectively disperse the force at the bolt connection of the sleeve 121, ensuring the installation stability of the sleeve 121. A notch is provided on one side of the limiting groove 410 near the connection between the sleeve and the drive device to facilitate the installation of the sleeve 121 and improve installation convenience.

[0053] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An injection pump, characterized in that, The device includes a pump body (100) and a liquid reservoir (200) containing a drug solution. The pump body (100) includes a housing (110), a push rod assembly (120) located inside the housing, and a connecting part (130) fixed to one end of the housing. The housing (110) is detachably connected to the liquid reservoir (200) through the connecting part (130), and the push rod assembly (120) is used to push the sealing assembly (300) inside the liquid reservoir to move so that the drug solution is discharged. The connecting part (130) includes a base (131) and a plurality of slots (132). The liquid reservoir (200) includes a cylinder (210) and a connecting flange (220) that corresponds to each slot (132). The liquid reservoir (200) can be rotated so that the connecting flange (220) is screwed into or out of the corresponding slot (132).

2. The infusion pump according to claim 1, characterized in that, The slot (132) includes a locking slot (1321) and a flared slot (1322); the locking slot (1321) is used to press-fit with the connecting flange (220), and the flared slot (1322) is used to guide the connecting flange (220) into the locking slot (1321).

3. The infusion pump according to claim 2, characterized in that, The flared slot (1322) has a guide groove (1323) at the end away from the locking slot (1321); the guide groove (1323) is clearance-fitted with the flange (220), and the guide groove (1323) has an opening (1324) at the end away from the flared slot (1322) for the connecting flange (220) to enter.

4. The infusion pump according to claim 2 or 3, characterized in that, The top and / or side walls of the slot (132) are provided with observation ports (1325).

5. The infusion pump according to claim 1, characterized in that, It also includes a disposable liquid storage cylinder and an external pull rod; the end of the external pull rod is detachably connected to the sealing component (300) inside the disposable liquid storage cylinder to form a liquid suction component; after the liquid suction component absorbs a preset dose of liquid medicine, the external pull rod is removed to obtain a liquid storage cylinder (200) containing liquid medicine.

6. The infusion pump according to claim 1, characterized in that, The push rod assembly (120) includes a sleeve (121), a drive screw (122), and a push rod (123); the push rod (123) and the drive screw (122) are both located inside the sleeve (121), and the push rod (123) is threaded onto the outside of the drive screw (122); the push rod (123) and the sleeve (121) have a circumferential limiting structure (160).

7. The infusion pump according to claim 6, characterized in that, The push rod assembly (120) also includes an abutment (124) for pushing the sealing assembly. The abutment (124) is disposed on the push rod (123) at the end away from the drive screw and is used to push the sealing assembly (300) to drain liquid.

8. The infusion pump according to claim 6, characterized in that, The base (131) has a through hole (133) along the axial direction of the sleeve (121) for the end of the push rod (123) to pass through.

9. The infusion pump according to claim 8, characterized in that, The sleeve (121) has a groove (1211) at its end, and the base (131) has a protrusion (134) at its bottom for the push rod to pass through. The protrusion (134) is coaxially arranged with the through hole (133), and the protrusion (134) is inserted into the groove (1211) so that the sleeve (121) is in a sealed state.

10. The infusion pump according to any one of claims 6 to 8, characterized in that, The pump body (100) also includes a drive device (140) and a battery (150), and the drive device (140) is used to drive the lead screw to rotate; the drive device (140) and the battery (150) are arranged inside the housing (110), and the drive device (140) and the battery (150) are located on both sides of the push rod assembly (120) to balance the counterweight of the pump body.

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