Filtering device for infusion and preparation method and mold thereof

Abstract

The filtering device comprises an upper cover and a lower cover, and a liquid medicine film and a hydrophobic film are fixed in the upper cover and the lower cover respectively; the upper cover and the lower cover are hermetically and fixedly connected through a covered edge; and the cross section of the covered edge is [-shaped. The invention further provides a preparation method which comprises the following steps that the upper cover and the lower cover which are fixedly provided with the liquid medicine film and the hydrophobic film respectively are subjected to press fit and injection molding to form the covered edge, the upper cover and the lower cover are fixedly connected in a sealed mode through the covered edge, the cross section of the covered edge is in a [shape, and the covered edge seals a gap between the connecting contact faces of the upper cover and the lower cover. The invention further provides a die which comprises an upper die and a lower die. The upper die and the lower die are of annular structures which are respectively matched with the side edges of an upper cover and a lower cover of the filtering device. The product qualification rate of the filtering device can be improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to a filtering device, in particular to a filtering device for infusion, and also to a preparation method and a mould of the filtering device. Background Art

[0002] The filter device for infusion is an essential accessory of a commonly used medical device infusion set, comprising an upper cover and a lower cover, wherein a liquid medicine membrane and a hydrophobic membrane are fixed in the upper cover and the lower cover respectively, and then the upper cover and the lower cover are sealed and connected.

[0003] At present, in the manufacturing process of the filter device for infusion, the sealing connection between the upper cover and the lower cover is mainly made by ultrasonic welding (a sealing ring is formed on the side wall at the connection between the upper cover and the lower cover). This connection method has major defects: vibration will be generated during the welding process, which is easy to damage the diaphragm inside the cover; and welding leakage is prone to occur, resulting in poor sealing. There is also an injection molding method to make the sealing connection between the upper cover and the lower cover (a sealing ring is formed on the side wall at the connection between the upper cover and the lower cover). These connection methods, such as Figure 1 As shown, there is a common problem: poor sealing is prone to occur, resulting in a low product qualification rate.

[0004] In order to overcome the above defects, technicians in this technical field have made improvements. For example, some people have proposed to wrap the upper cover and the lower cover with injection molding to "make an integrated structure", such as Figure 2 As shown, the upper cover and the lower cover are enclosed by wrapping. Although the filter device prepared by this method can overcome the defects caused by welding, it also brings new defects: because the upper cover and the lower cover are integrally injection-molded and wrapped to "make an integrated structure", the volume and material consumption of the wrapping will increase, that is, the cost will increase; in addition, during the preparation process, the upper cover and the lower cover cannot be pressed tightly, which may easily lead to loose closure and allow the sealing material to enter the inner cavity of the filter device, which will affect the product qualification rate. Summary of the invention

[0005] The present invention aims to provide an improved filtering device for infusion, so as to improve the product qualification rate and reduce the cost, and also provides a preparation method and a mold of the filtering device.

[0006] In order to solve the above technical problems, the filtering device for infusion of the present invention comprises an upper cover and a lower cover, wherein a drug liquid membrane and a hydrophobic membrane are fixed in the upper cover and the lower cover respectively; the upper cover and the lower cover are fixedly connected by an edge sealing; the cross section of the edge is [-shaped.

[0007] The material of the edge wrapping is plastic.

[0008] The edge is sealed and fixedly connected with the upper cover and the lower cover through injection molding.

[0009] The hemming seals the side surfaces of the upper cover and the lower cover and a part of the upper surface of the upper cover and a part of the lower surface of the lower cover.

[0010] The side edges of the upper cover and the lower cover are provided with protruding edges; the protruding edges of the upper cover and the lower cover are contact-sealed and fixedly connected; and the hemming seals the protruding edges.

[0011] In order to prepare the above-mentioned filtering device, the present invention provides a method for preparing a filtering device for infusion, comprising the following steps: pressing an upper cover and a lower cover respectively fixed with a drug liquid membrane and a hydrophobic membrane, injection molding to form an edge wrapping, so that the upper cover and the lower cover are sealed and fixedly connected by the edge wrapping, the cross-section of the edge wrapping is [-shaped, and the edge wrapping closes the gap between the connecting contact surfaces of the upper cover and the lower cover.

[0012] First, the upper cover and the lower cover are prepared separately, and then the liquid medicine membrane and the hydrophobic membrane are fixed in the upper cover and the lower cover respectively, and then the upper cover and the lower cover are pressed and injection molded to form an edge.

[0013] In order to prepare the edging of the above-mentioned filter device, the present invention provides a mold for preparing the edging of the filter device, including an upper mold and a lower mold; the upper mold and the lower mold are annular structures respectively adapted to the side edges of the upper cover and the lower cover of the filter device.

[0014] The upper mold and the lower mold are provided with long sides, transverse sides and pressure sides; the transverse sides are respectively connected to the long sides and the pressure sides and are vertically arranged; the pressure sides of the upper mold press the upper surface of the upper cover and are in contact connection; the pressure sides of the lower mold press the lower surface of the lower cover and are in contact connection; the long sides of the upper mold and the edges of the long sides of the lower mold are in contact connection.

[0015] The upper mold and the lower mold are provided with long sides and transverse sides; the transverse sides are connected to the long sides and are vertically arranged; the transverse sides are respectively pressed and contacted with the side sides of the upper cover and the lower cover; the long sides of the upper mold and the edges of the long sides of the lower mold are contacted and connected.

[0016] According to the structure of the present invention, the upper cover and the lower cover are fixedly connected by sealing with an edge, and the cross section of the edge is [-shaped. The edge is formed by pressing the upper cover and the lower cover by injection molding with an upper mold and a lower mold. The edge seals the gap between the connecting contact surfaces of the upper cover and the lower cover, and the sealing effect is good. In addition, no sealing material will enter the inner cavity of the filter device, and the product qualification rate is high. Due to the sealing of the edge structure of the present invention, it is not necessary to completely wrap the filter device, which reduces the volume and material consumption and saves costs.

[0017] The method and the mold of the present invention can be used to prepare the sealing edge of the filter device of the present invention, thereby achieving the purpose of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the filtering device of the present invention is schematically shown in the prior art. Figure 1 ; Figure 2The structure of the filtering device of the present invention is schematically shown in the prior art. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the filter device edge wrapping of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the filter device edge wrapping of the present invention. Figure 2 ; Figure 5 It is a schematic diagram of the edge wrapping and mold structure of the filtering device of the present invention; Figure 6 The structure of the filter device edge wrapping mold of the present invention is shown in FIG. Figure 1 ; Figure 7 The structure of the filter device edge wrapping mold of the present invention is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figure 1 As shown, the infusion filtering device of the present invention comprises an upper cover 1 and a lower cover 2, wherein a drug liquid membrane and a hydrophobic membrane are fixed in the upper cover and the lower cover respectively. The upper cover and the lower cover are sealed and fixedly connected by a rim 3. The cross section of the rim 3 is [-shaped.

[0020] The edging material is plastic.

[0021] The edge is sealed and fixedly connected with the upper cover and the lower cover by injection molding, and the gap between the upper cover and the lower cover is closed by the edge.

[0022] As a preferred embodiment, the present invention provides a first structure of a filter device and an edge wrapping, such as Figure 3 As shown: the side surfaces of the upper cover and the lower cover and part of the upper surface of the upper cover and part of the lower surface of the lower cover are sealed by the hemming.

[0023] As a preferred embodiment, the present invention also provides a second structure of the filter device and the edge wrapping, such as Figure 4 As shown: the side edges of the upper cover and the lower cover are provided with protruding edges 4, the protruding edges of the upper cover and the lower cover are in contact, sealed and fixed connection, and the protruding edges are sealed by the hemming.

[0024] In order to prepare the edge of the filter device of the present invention, the present invention provides a preparation method, comprising the following steps: pressing the upper cover and the lower cover respectively fixed with the liquid medicine membrane and the hydrophobic membrane through a mold, injecting into the mold to form the edge, so that the upper cover and the lower cover are sealed and fixedly connected through the edge, the cross section of the edge is [-shaped, and the edge seals the gap of the connection contact surface between the upper cover and the lower cover. The injection molding process is a prior art.

[0025] Preferably, the upper cover and the lower cover are prepared separately first, and then the liquid medicine membrane and the hydrophobic membrane are fixed in the upper cover and the lower cover respectively, and then the upper cover and the lower cover are pressed together by injection molding to form the edge.

[0026] like Figure 5 As shown, in order to implement the method of the present invention, the present invention also provides a mold for preparing a filter device, including an upper mold 5 and a lower mold 6. The upper mold and the lower mold are annular structures adapted to the sides of the upper cover and the lower cover of the filter device respectively.

[0027] In order to adapt to the two filter device edge wrapping structures of the present invention, the present invention also provides two molds.

[0028] The first mold: Figure 6 As shown, the upper mold and the lower mold are provided with long sides 7, transverse sides 8 and pressure edges 9. The transverse sides are respectively connected to the long sides and the pressure edges and are arranged vertically. The pressure edges of the upper mold press the upper surface of the upper cover and are in contact connection. The pressure edges of the lower mold press the lower surface of the lower cover and are in contact connection. The edges of the long sides of the upper mold and the long sides of the lower mold are in contact connection.

[0029] The first mold is used to prepare the edge of the first structure filter device.

[0030] The second mold: Figure 7 As shown, the upper mold and the lower mold are provided with long sides 7 and transverse sides 8. The transverse sides are connected to the long sides and are arranged vertically. The transverse sides are respectively pressed and contacted with the side edges of the upper cover and the lower cover. The long sides of the upper mold and the long sides of the lower mold are contacted and connected at their edges.

[0031] The second mold is used to prepare the edge of the second structure filtering device.

Claims

1. A filtering device for infusion, comprising an upper cover (1) and a lower cover (2), wherein a drug solution membrane and a hydrophobic membrane are fixed in the upper cover and the lower cover respectively; characterized in that: The upper cover and the lower cover are sealed and fixedly connected by an edge wrapping (3); the cross section of the edge wrapping is [-shaped.

2. The filtering device according to claim 1, characterized in that: The material of the edging is plastic.

3. The filtering device according to claim 1, characterized in that: The edge is sealed and fixedly connected with the upper cover and the lower cover through injection molding.

4. The filtering device according to claim 1, characterized in that: The edge binding seals the side surfaces of the upper cover and the lower cover and a portion of the upper surface of the upper cover and a portion of the lower surface of the lower cover.

5. The filtering device according to claim 1, characterized in that: The side edges of the upper cover and the lower cover are provided with protruding edges (4); the protruding edges of the upper cover and the lower cover are in contact, sealed and fixed connection; and the hemming seals the protruding edges.

6. A method for preparing a filter device for infusion, characterized in that: The method comprises the following steps: pressing an upper cover and a lower cover respectively fixed with a liquid medicine membrane and a hydrophobic membrane, and forming an edge by injection molding, so that the upper cover and the lower cover are sealed and fixedly connected by the edge, the cross section of the edge is [-shaped, and the edge seals the gap between the upper cover and the lower cover.

7. The method according to claim 6, characterized in that: First, the upper cover and the lower cover are prepared separately, and then the liquid medicine membrane and the hydrophobic membrane are fixed in the upper cover and the lower cover respectively, and then the upper cover and the lower cover are pressed and injection molded to form an edge.

8. A mold for preparing the edge wrapping of the filter device according to claim 1, characterized in that: It comprises an upper die (5) and a lower die (6); the upper die and the lower die are annular structures respectively adapted to the side edges of the upper cover and the lower cover of the filtering device.

9. The mold according to claim 8, characterized in that: The upper mold and the lower mold are provided with long sides (7), transverse sides (8) and pressing sides (9); the transverse sides are respectively connected to the long sides and the pressing sides and are vertically arranged; the pressing sides of the upper mold press the upper surface of the upper cover and are in contact connection; the pressing sides of the lower mold press the lower surface of the lower cover and are in contact connection; the long sides of the upper mold and the edges of the long sides of the lower mold are in contact connection.

10. The mold according to claim 8, characterized in that: The upper mold and the lower mold are provided with long sides (7) and transverse sides (8); the transverse sides are connected to the long sides and are arranged vertically; the transverse sides are respectively pressed and contacted with the side edges of the upper cover and the lower cover; the long sides of the upper mold and the edges of the long sides of the lower mold are contacted and connected.

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