Filtering module and infusion pump device

Abstract

The present invention relates to the technical field of medical instruments. Disclosed are a filtering module and an infusion pump device. The filtering module comprises a housing, a first filtering layer, a second filtering layer, and a silicone plug; a liquid inlet and a liquid outlet are respectively provided on two opposite sides of the housing; the first filtering layer and the second filtering layer are sequentially filled into the housing in the direction from the liquid inlet to the liquid outlet; and the silicone plug covers the liquid outlet, and is in sealing fit with the liquid outlet. The diameter of particulate impurities filtered by the first filtering layer is greater than that of particulate impurities filtered by the second filtering layer. The filtering module disclosed in the present invention can be used for filtering a liquid medicament in an infusion pump device, thereby ensuring the injection effect.

Description

[0001] This invention relates to the field of medical device technology, and particularly to a filter module and an infusion pump device. Background Art: Infusion pump devices, as medical devices that allow users to self-inject medications, are gaining increasing attention due to their convenience and efficiency. Because infusion pump devices require pre-storing liquid medications, particulate impurities inevitably become present during storage. When the user uses the infusion pump device, larger particles can easily clog the medication delivery tube, preventing the medication from entering the user's body and resulting in poor injection efficacy. Summary of the Invention: This invention provides a filter module and an infusion pump device that can filter liquid medications within the infusion pump device, thereby ensuring effective injection. In a first aspect, the present invention provides a filtration module for filtering liquid pharmaceuticals in an infusion pump device. The filtration module includes a housing, a first filter layer, a second filter layer, and a silicone plug. The housing has a liquid inlet and a liquid outlet on opposite sides. The first filter layer and the second filter layer are sequentially filled inside the housing along the direction from the liquid inlet to the liquid outlet. The silicone plug covers the liquid outlet and provides a sealed fit. The diameter of the particulate impurities filtered by the first filter layer is larger than the diameter of the particulate impurities filtered by the second filter layer. The filtration module provided by the present invention can be applied to an infusion pump device, specifically positioned between a pharmaceutical storage module and a pharmaceutical conduit. When the user uses the infusion pump device, the liquid pharmaceuticals in the pharmaceutical storage module enter the housing through the liquid inlet, pass through the first filter layer and the second filter layer sequentially, and then flow into the pharmaceutical conduit. As the liquid pharmaceuticals flow within the housing, they first undergo primary filtration through the first filter layer to remove larger diameter impurity particles, and then undergo secondary filtration through the second filter layer to remove smaller diameter impurity particles. The liquid medication, after undergoing two filtrations, flows through the delivery tube, preventing larger impurities from clogging it and ensuring that as much of the liquid medication as possible enters the user's body, thus guaranteeing the injection's effectiveness. In some possible implementations, the first filter layer is made of sponge or polyethylene. In some possible implementations, the second filter layer includes a filter membrane, or the second filter layer is made of polyethylene. In some possible implementations, when the second filter layer includes a filter membrane, it further includes a positioning ring located on the side of the filter membrane opposite to the first filter layer; the opposite sides of the positioning ring abut against the filter membrane and the silicone plug, respectively, so that the filter membrane adheres to the first filter layer.In some possible embodiments, when the material of the second filter layer is polyethylene, the silicone plug has an annular abutment portion on the side facing the second filter layer, and the annular abutment portion is in contact with the second filter layer on the side facing the second filter layer. In some possible embodiments, along the arrangement direction of the liquid inlet and the liquid outlet, the size of the first filter layer is twice the size of the second filter layer. In some possible embodiments, the first filter layer is used to filter particulate impurities with a diameter of 100 pm-1 mm. In some possible embodiments, the second filter layer is used to filter particulate impurities with a diameter of 0.2 mm-100 pm. Secondly, the present invention provides an infusion pump device, including a drug storage module for storing liquid drugs, a drug conduit for introducing the liquid drugs in the drug storage module into a user's body, and a filter module as described in any possible embodiment of the first aspect; the filter module is disposed between the drug storage module and the drug conduit, and one end of the drug conduit passes through the silicone plug and communicates with the interior of the housing. In some possible implementations, the cross-sectional shape of the end of the drug delivery tube that passes through the silicone plug is quincunx-shaped. Figure 1 is a partial cross-sectional view of one embodiment of the infusion pump device; Figure 2 is another partial cross-sectional view of one embodiment of the infusion pump device; Figure 3 is a cross-sectional view of one embodiment of the drug delivery tube. (Figures: )

[0002] 100 - Filter module; 110 - Housing; 120 - First filter layer; 130 - Second filter layer; 131 - Filter membrane; 132 - Positioning ring; 140 - Silicone plug; 150 - Annular abutment portion; 200 - Drug storage module; 300 - Drug conduit. Detailed Description of Embodiments The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Referring to Figure 1, the filter module 100 in the embodiments of the present invention can be applied to an infusion pump device to filter liquid drugs to prevent the drug from clogging the drug conduit 300 when it flows in the drug conduit 300. Specifically, the filter module 100 can be disposed between the drug storage module 200 and the drug delivery tube 300. The drug storage module 200 is used to store liquid drugs, and the drug delivery tube 300 is used to introduce liquid drugs into the user's body. That is to say, the filter module 100 in this embodiment can filter the liquid drugs before they enter the drug delivery tube 300, thereby reducing particulate impurities in the liquid drugs entering the drug delivery tube 300. In this way, not only can blockage of the drug delivery tube 300 be avoided, but the purity of the liquid drugs can also be improved, thereby ensuring the injection effect. As shown in Figure 1, the filter module 100 may include a housing 110, a first filter layer 120, a second filter layer 130, and a silicone plug 140. The housing 110 has a liquid inlet and a liquid outlet at opposite ends. The first filter layer 120 and the second filter layer 130 are sequentially filled inside the housing 110 along the direction from the liquid inlet to the liquid outlet. The silicone plug 140 covers the liquid outlet and is sealed to the liquid outlet. Here, it is worth noting that, taking the cylindrical shape of the housing 110 as an example, the first filter layer 120 filling the interior of the housing 110 can be understood as the first filter layer 120 abutting against the inner wall of the housing 110 at least in the circumferential direction, thereby ensuring that there is no gap between the first filter layer 120 and the inner wall of the housing 110. During the process of the liquid agent flowing from the liquid inlet to the liquid outlet, the liquid agent must pass through the first filter layer 120 to be filtered.Similarly, the second filter layer 130 filling the interior of the housing 110 can also be understood as the second filter layer 130 abutting against the inner wall of the housing 110 in the circumferential direction, to ensure that the liquid agent flowing from the first filter layer 120 to the liquid outlet must pass through the second filter layer 130 for filtration. Alternatively, the first filter layer 120 can also be closely attached to the inner wall of the housing 110 on the side where the liquid inlet is located. This maximizes the volume of the first filter layer 120 and also allows it to remain relatively fixed within the housing 110. The surface of the silicone plug 140 facing the second filter layer 130 can also abut against the second filter layer 130, thus keeping the second filter layer 130 relatively fixed within the housing 110. In this embodiment, the first filter layer 120 and the second filter layer 130 are used to filter impurity particles of different diameters. Specifically, the diameter of the impurity particles filtered by the first filter layer 120 is larger than the diameter of the impurity particles filtered by the second filter layer 130. It is understood that the first filter layer 120 is used for initial filtration of the liquid agent, and the second filter layer 130 is used for secondary filtration of the liquid agent, thereby improving the filtration effect of the liquid agent. In some embodiments, the first filter layer 120 can be used to filter particulate impurities with a diameter of 100 μm-1 mm. Based on this, the material of the first filter layer 120 can be, for example, sponge or polyethylene (PE). When the material of the first filter layer 120 is polyethylene, a PE sintering process can be used to form multiple filter pores to filter particulate impurities through the filter pores. The second filter layer 130 can be used to filter particulate impurities with a diameter of 0.2 μm-100 μm. Based on this, the second filter layer 130 can, for example, include a filter membrane 131, or the material of the second filter layer 130 is polyethylene. Similarly, when the second filter layer 130 is made of polyethylene, a PE sintering process can be used to form multiple filter pores for further filtration of particulate impurities. In practical applications, the combination of the first filter layer 120 and the second filter layer 130 can be polyethylene with polyethylene, polyethylene with filter membrane 131, sponge with polyethylene, or sponge with filter membrane 131. It should be noted that when both the first filter layer 120 and the second filter layer 130 are made of polyethylene, the pore size of the filter pores formed in the first filter layer 120 is larger than the pore size of the filter pores formed in the second filter layer 130.Referring to Figure 1, when the second filter layer 130 includes a filter membrane 131, the second filter layer 130 also includes a positioning ring 132, which is located on the side of the filter membrane 131 facing away from the first filter layer 120. The positioning ring 132 can abut against the inner wall of the housing 110 along the circumference of the housing 110, and the opposite ends of the positioning ring 132 can abut against the filter membrane 131 and the silicone plug 140 respectively. At this time, under the pressure of the positioning ring 132, the filter membrane 131 can maintain a close fit with the first filter layer 120. The secondary filtration method adopted in this embodiment can avoid large particulate impurities clogging the filter membrane 131, thereby avoiding a decrease in the water permeability of the filter membrane 131 and preventing a reduction in the amount of medicine passing through 131, which would affect the injection effect. In addition, the secondary filtration method can also reduce the usable area of ​​the filter membrane 131 and improve the filtration effect. As an optional implementation, the positioning ring 132 and the filter membrane 131 can be an integral structure. This simplifies the assembly process when assembling the filter module 100 and improves the assembly effect. Furthermore, the central part of the positioning ring 132 is hollow. When the drug delivery tube 300 passes through the silicone stopper 140, the end of the drug delivery tube 300 can extend into the hollow structure of the positioning ring 132, thereby increasing the length of the drug delivery tube 300 extending into the housing 110. After the liquid drug passes through the filter membrane 131, the hollow structure of the positioning ring 132 can temporarily store the liquid drug and allow it to flow as much as possible into the drug delivery tube 300, thus avoiding waste. Furthermore, due to the sealing effect of the silicone stopper 140, the silicone stopper 140 can block the liquid medicine, allowing the medicine to flow out of the housing 110 only through the medicine conduit 300. Referring to Figure 2, when the material of the second filter layer 130 is polyethylene, the silicone stopper 140 has an annular abutment portion 150 on the side facing the second filter layer 130. The annular abutment portion 150 abuts against the second filter layer 130 on the side facing the second filter layer 130, thereby ensuring that the silicone stopper 140 and the second filter layer 130 are relatively fixed. In this embodiment, the annular abutment portion 150 has a hollow structure in the middle. After the medicine passes through the silicone stopper 140, it can extend into the hollow structure of the annular abutment portion 150, thereby increasing the length of the medicine conduit 300 extending into the housing 110. After the liquid medicine passes through the second filter layer 130, the hollow structure of the annular contact portion 150 can temporarily store the liquid medicine and allow the liquid medicine to flow into the medicine conduit 300 as much as possible, thereby avoiding waste of the liquid medicine.As an optional implementation, the annular abutment 150 and the silicone plug 140 can be an integral structure. This simplifies the assembly process when assembling the filter module 100 and improves the assembly effect. In some embodiments, as shown in FIG1 or FIG2, along the arrangement direction of the liquid inlet and liquid outlet of the housing 110, the size of the first filter layer 120 is twice the size of the second filter layer 130. That is, with the same diameter, the height of the first filter layer 120 is greater than the height of the second filter layer 130. This increases the contact area between the first filter layer 120 and the liquid agent, ensuring sufficient contact between the first filter layer 120 and the liquid agent, thereby achieving a better filtration effect and filtering out more large-diameter particulate impurities. When the liquid agent passes through the second filter layer 130, the filtration efficiency of the second filter layer 130 can be improved, thereby improving the overall filtration efficiency. It should be noted that when the second filter layer 130 includes a filter membrane 131 and a positioning ring 132, the height of the second filter layer 130 refers to the overall height of the filter membrane 131 and the positioning ring 132. Based on the same design concept, this embodiment can also provide an infusion pump device. Referring to Figure 1 or Figure 2, the infusion pump device may include a drug storage module 200, a drug conduit 300, and the filter module 100 involved in the above embodiments. As mentioned above, the filter module 100 is located between the drug storage module 200 and the drug conduit 300, and is used to filter the liquid drug before it flows into the drug conduit 300 to remove impurity particles in the liquid drug. This not only prevents impurity particles in the liquid drug from clogging the drug conduit 300, but also ensures the injection effect. Referring to Figure 3, the cross-sectional shape of the end of the drug delivery tube 300 that passes through the silicone plug 140 is quincunx-shaped. Specifically, as shown in Figure 3, the cross-section of the drug delivery tube 300 for flowing liquid drugs can be seen as an inner ring region A at the center and multiple petal-shaped regions B evenly distributed circumferentially along region A. Given the same cross-sectional area, the diameter of the inner ring region A of the quincunx-shaped cross-section is smaller than the diameter of the circular cross-section. When the liquid drug enters the drug delivery tube 300, even if the liquid drug contains particulate impurities, these impurities will enter the drug delivery tube 300 through the inlet corresponding to region A and remain in the drug delivery tube 300 due to friction. However, the liquid drug can still flow normally into the drug delivery tube 300 through the multiple regions B, thereby reducing the risk of clogging the drug delivery tube 300.Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

Claims 1. A filter module for filtering a liquid medicament in an infusion pump device, characterized in that The filtration module includes a housing, a first filter layer, a second filter layer, and a silicone plug. The housing has a liquid inlet and a liquid outlet on opposite sides. The first filter layer and the second filter layer are sequentially filled inside the housing along the direction from the liquid inlet to the liquid outlet. The silicone plug covers the liquid outlet and provides a sealed fit. The diameter of the particulate impurities filtered by the first filter layer is larger than the diameter of the particulate impurities filtered by the second filter layer.

2. The filter module of claim 1, wherein The first filter layer is made of sponge or polyethylene.

3. The filter module of claim 1, wherein The second filter layer includes a filter membrane, or the material of the second filter layer is polyethylene.

4. The filter module of claim 3, wherein When the second filter layer includes a filter membrane, the second filter layer also includes a positioning ring, which is located on the side of the filter membrane opposite to the first filter layer; the opposite sides of the positioning ring abut against the filter membrane and the silicone plug respectively, so that the filter membrane is in contact with the first filter layer.

5. The filter module of claim 3, wherein When the material of the second filter layer is polyethylene, the silicone plug has an annular abutment portion on the side facing the second filter layer, and the annular abutment portion abuts against the second filter layer on the side facing the second filter layer.

6. The filter module according to claim 4 or 5, characterized in that Along the arrangement direction of the liquid inlet and the liquid outlet, the size of the first filter layer is twice the size of the second filter layer.

7. The filter module of claim 1, wherein The first filter layer is used to filter particulate impurities with a diameter of 100pm-1mm. 8 8. The filter module of claim 1, wherein The second filter layer is used to filter particulate impurities with a diameter of 0.2 μm to 100 μm.

9. An infusion pump device, characterized by It includes a drug storage module for storing liquid drugs, a drug delivery tube for introducing the liquid drugs in the drug storage module into the user's body, and a filtration module as described in any one of claims 1 to 8; The filter module is disposed between the drug storage module and the drug conduit, and one end of the drug conduit passes through the silicone plug and communicates with the interior of the shell.

10. The output pump apparatus according to claim 9, characterized by, The cross-sectional shape of the drug delivery tube, which passes through one end of the silicone plug, is plum blossom shaped. 9

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