Sealing device and pump infusion device

Abstract

The utility model provides a sealing device and an infusion device for a pump. The sealing device comprises a base, a guide pipe seat, an elastic piece and a cover body which are coaxially arranged, the base is detachably connected with the cover body, a first through hole and a second through hole which are communicated are formed in the base in the axial direction, one end of the guide pipe seat is arranged in the first through hole, the elastic piece is in interference fit with the inner wall of the second through hole, and therefore the base, the guide pipe seat, the elastic piece and the cover body are connected in a sealed mode. The catheter seat is provided with a groove, the bottom of the groove is provided with a third through hole penetrating through the catheter seat, a cavity is formed between the elastic part and the base, a gap is formed between the elastic part and the surface, provided with the groove, of the catheter seat, liquid medicine enters the cavity from the base, the liquid medicine in the cavity enters the groove through the gap and then enters the third through hole, and the sealing effect of the liquid medicine is guaranteed; the elastic piece applies acting force to the cover body and the base respectively, and sealing connection of the cover body and the base is guaranteed. The base, the guide pipe seat, the elastic piece and the cover body are coaxially arranged, assembly is simple, and a gluing process is not needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical field, especially pump infusion device of a kind of sealing device. BACKGROUND

[0002] Diabetes is a chronic metabolic disease. For diabetic patients, accurately control blood sugar level is essential to reduce diabetic complications and improve patient quality of life. Many patients need long-term insulin therapy, which makes the performance and safety of insulin infusion device receive extensive attention.

[0003] Disposable pump infusion device can be divided into hard needle type and soft needle type. Among them, soft needle infusion device is mainly made of soft needle, infusion pipeline, indwelling seat and other auxiliary components. The subcutaneous indwelling needle of soft needle infusion device is made of soft and elastic material, compared with traditional steel needle, soft needle has less stimulation and damage to skin, which is beneficial to reduce the risk of subcutaneous induration and infection, allowing patients to maintain a certain degree of freedom while receiving insulin therapy, thereby improving the quality of life of patients.

[0004] At present, the structure of soft needle infusion device is relatively complex. The inside of the indwelling seat needs to use glueing process to bond the sealing silica gel plug and the base with glue during the assembly process of the indwelling seat, so as to achieve the sealing of the infusion cavity. The process requirement is high, there is a risk of blockage or leakage of sealing element due to uneven glue coating caused by glueing process, and there may be appearance defects and other problems.

[0005] It should be noted that the information disclosed in the background technology part of the utility model is only intended to deepen the understanding of the general background technology of the utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims to provide a sealing device and pump infusion device with improved sealing performance and simple process.

[0007] The utility model provides a sealing device which comprises a base, a catheter seat, an elastic member and a cover body which are coaxially arranged, the base is detachably connected with the cover body, the catheter seat and the elastic member are located between the base and the cover body, the elastic member is arranged on the catheter seat, the base has a first through hole and a second through hole which are in communication in the axial direction, the first through hole and the second through hole are coaxially arranged, one end of the catheter seat is arranged in the first through hole, the catheter seat is in interference fit with the inner wall of the first through hole, the elastic member is in interference fit with the inner wall of the second through hole, the cover body abuts against the elastic member, the catheter seat has a groove, the bottom of the groove has a third through hole which penetrates through the catheter seat, a cavity is formed between the elastic member and the base, and a gap is formed between the surface of the catheter seat in which the groove is formed and the elastic member.

[0008] Optionally, the outer surface of the base is provided with a protrusion, and the cover body is provided with a buckle corresponding to the protrusion.

[0009] Optionally, a guide groove is formed on the surface of the base close to the cover body, and the cover body is provided with a guide member matched with the guide groove.

[0010] Optionally, the catheter seat comprises a first part, a second part and a third part which are sequentially connected in the axial direction, the maximum cross section of the second part is smaller than the minimum cross section of the first part, the cross section of the second part gradually decreases in the direction towards the base, and the cross section of the third part is the same as the minimum cross section of the second part.

[0011] Optionally, the cross section of the groove gradually decreases in the direction towards the base.

[0012] Optionally, the elastic compression amount of the elastic member is 12%-30%.

[0013] Optionally, the sealing device further comprises a sticking layer arranged on the surface of the base away from the cover body, and / or the base has a fourth through hole, the central axis of the fourth through hole is perpendicular to the central axis of the second through hole, and the fourth through hole is in communication with the cavity.

[0014] To achieve the above-mentioned purpose, the utility model also provides a pump infusion device which comprises a puncture assembly, a soft needle, an infusion assembly and the above-mentioned sealing device, the soft needle is sleeved outside the catheter seat, the infusion assembly is connected with the base, the infusion assembly provides infusion liquid for the base, the puncture assembly is connected with the sealing device, and the puncture assembly sequentially penetrates through the cover body, the elastic member, the groove of the catheter seat and the soft needle.

[0015] Optionally, the puncture assembly comprises a puncture base and a puncture needle, the puncture needle is arranged on the puncture base, and the puncture base is detachably connected with the cover body; and / or,

[0016] The base has a fourth through hole, a central axis of the fourth through hole is perpendicular to a central axis of the second through hole, and the fourth through hole is in communication with the cavity; the infusion assembly comprises an infusion pipeline, a connector and a connector switch, one end of the infusion pipeline is provided with the connector, and the other end of the infusion pipeline penetrates through the fourth through hole; and the connector switch is arranged on the infusion pipeline.

[0017] Optionally, the puncture assembly further comprises a protective sleeve, the protective sleeve is detachably connected with or abuts against the base, and the protective sleeve is used for protecting an end of the puncture needle away from the puncture base.

[0018] Compared with the prior art, the sealing device has the following beneficial effects:

[0019] The sealing device comprises a base, a catheter seat, an elastic member and a cover body arranged coaxially, the base is detachably connected with the cover body, the catheter seat and the elastic member are located between the base and the cover body, the elastic member is arranged on the catheter seat, the base has a first through hole and a second through hole in communication in the axial direction, the first through hole and the second through hole are arranged coaxially, one end of the catheter seat is arranged in the first through hole and is in interference fit with the inner wall of the first through hole, and the elastic member is in interference fit with the inner wall of the second through hole, so that the base, the catheter seat, the elastic member and the cover body are sealingly connected. The cover body abuts against the elastic member, the catheter seat has a groove, the bottom of the groove has a third through hole penetrating through the catheter seat, a cavity is formed between the elastic member and the base, and a gap is formed between the surface of the elastic member and the catheter seat in which the groove is arranged, so that the liquid medicine enters the cavity from the base, the liquid medicine in the cavity enters the groove through the gap and then enters the third through hole. Since the base, the catheter seat, the elastic member and the cover body are sealingly connected, the sealing effect of the liquid medicine is ensured, and the cover body and the base are sealingly connected by the setting of the elastic member, and the sealing effect is further improved. In addition, the base, the catheter seat, the elastic member and the cover body are sealingly connected and arranged coaxially, and the assembly is simple and does not need to use a gluing process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A structural schematic view of the infusion device for a pump according to an embodiment of the present application is provided;

[0021] Fig. 2 A structural schematic view of the sealing device according to an embodiment of the present application is provided;

[0022] Fig. 3 A structural schematic view of the sealing device and the puncture assembly according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0023] The sealing device and infusion set for pump according to the present application will be further described below in conjunction with the drawings and specific embodiments. The advantages and features of the present application will be more apparent from the following description. It should be noted that the drawings are very simplified and all use non-precise proportions, only for the purpose of facilitating, clarifying and assisting in the description of the embodiments of the present application. In order to make the purpose, features and advantages of the present application more apparent and easy to understand, please refer to the drawings. It should be understood that the structures, proportions, sizes and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the description, so that those skilled in the art can understand and read, and are not used to limit the conditions of the embodiments of the present application. Any modification of structure, change of proportion relationship or adjustment of size, as long as it is the same or similar to the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. The specific design features of the present application disclosed in this paper include, for example, specific dimensions, directions, positions and shapes, which will be determined partly by the specific application and use environment. In the embodiments described below, sometimes the same reference signs are used to represent the same parts or parts with the same function between different drawings, and the repeated description is omitted. In this specification, similar reference signs and letters are used to represent similar items, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0024] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Moreover, the terms "include", "contain" or any other variants are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element. The singular form "one", "a" and "the" includes plural objects, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more", and the term "multiple" is generally used in the sense of including "at least two".

[0025] In the description of the utility model, need understanding is, the orientation or positional relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relation shown in the drawings, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore can not be understood as a limitation on the utility model. In the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrated, can be directly connected, or indirectly connected through an intermediate medium, can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances. In addition, in the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] Please refer to Figs. 1 to 3 The sealing device 100 of an embodiment comprises a base 110, a catheter seat 120, an elastic member 130 and a cover 140. The sealing device 100 is used for a pump infusion device 10, especially a soft needle infusion device, to ensure the sealing of the pump infusion device 10 for drug infusion, and the production process is simple. The sealing device 100 is a retention seat assembly of the pump infusion device 10, which is used for fixing an injection needle, and in the embodiment, the injection needle is a soft needle.

[0027] Specifically, the base 110, the catheter seat 120, the elastic member 130 and the cover 140 are coaxially arranged, that is, the base 110, the catheter seat 120, the elastic member 130 and the cover 140 are concentrically assembled, and the central axes thereof are located on the same straight line. With this structure, the rapid assembly of the sealing device 100 is facilitated, and the production process is simplified. The base 110 and the cover 140 are detachably connected, for example, can be detachably connected through buckling or the like, so as to realize the sealing connection of the base 110 and the cover 140. The catheter seat 120 and the elastic member 130 are located between the base 110 and the cover 140, and the elastic member 130 is arranged on the catheter seat 120, so that when the base 110 and the cover 140 are connected, the catheter seat 120 and the elastic member 130 are compressed between the base 110 and the cover 140. Among them, the cover 140 and the elastic member 130 have a through hole for the puncture assembly to pass through.

[0028] Further, the base 110 has a first through hole 111 and a second through hole 112 in communication in the axial direction, and the first through hole 111 and the second through hole 112 are coaxially arranged. It should be noted that the first through hole 111 and the second through hole 112 can be integrally formed. In this embodiment, the inner diameters of the first through hole 111 and the second through hole are not the same. One end of the catheter seat 120 is arranged in the first through hole 111, and the catheter seat 120 is in interference fit with the inner wall of the first through hole 111, that is, the catheter seat 120 is in interference fit with the base 110, and the outer diameter of one end of the catheter seat 120 is equal to the inner diameter of the first through hole 111 of the base 110, so as to ensure the sealing between the catheter seat 120 and the base 110. In addition, as shown in the drawings, the other end of the catheter seat 120 protrudes out of the first through hole 111. The elastic member 130 is in interference fit with the inner wall of the second through hole 112, that is, the elastic member 130 is in interference fit with the base 110, that is, part of the structure of the elastic member 130 extends into the second through hole 112, and the outer diameter of the part of the structure of the elastic member 130 extending into the second through hole 112 is equal to the inner diameter of the second through hole 112, so as to realize compression sealing, thereby ensuring the sealing between the elastic member 130 and the base 110. The cover 140 abuts against the elastic member 130, so that when the base 110 and the cover 140 are connected, the base 110, the catheter seat 120, the elastic member 130 and the cover 140 are sealingly connected, forming a sealing structure. Fig. 2

[0029] Please continue to refer to Fig. 3 ​The conduit seat 120 has a groove 121, and the bottom of the groove 121 has a third through hole 122 penetrating the conduit seat 120. It should be noted that the groove 121 is arranged on the surface of the conduit seat 120 away from the base 110, and the third through hole 122 extends to the surface of the conduit seat 120 close to the base 110. The groove 121 and the third through hole 122 can be integrally formed, and at this time, the groove 121 and the third through hole 122 are a through hole with a non-equal-diameter structure. When the base 110, the conduit seat 120, the elastic member 130, and the cover 140 are installed, the elastic member 130 and the base 110 form a cavity, and the elastic member 130 and the surface of the conduit seat 120 where the groove 121 is arranged have a gap, so that the drug solution enters the cavity from the base, the drug solution in the cavity enters the groove 121 through the gap, and then enters the third through hole 122, realizing infusion of the drug solution. The soft needle is used to be installed in the third through hole 122, so that the drug solution enters the soft needle and enters the patient's subcutaneous tissue through the soft needle, realizing infusion of the drug solution.

[0030] In addition, as known from the above, the elastic member 130 is arranged between the base 110 and the cover, the elastic member 130 abuts against the cover 140, realizing compression sealing of the two, and the elastic member 130 is in interference fit with the base 110, so that after the base 110 and the cover 140 are installed, the compressed elastic member 130 is deformed, the deformed elastic member 130 has an upward pushing force on the cover 140 and a downward pushing force on the base 110, so as to ensure that the cooperation between the base 110 and the cover 140 will not be separated, and the two are tightly connected, further improving the sealing performance. The elastic member 130 can be a rubber plug or the like. In addition, the base 110, the conduit seat 120, the elastic member 130, and the cover 140 are coaxially arranged, the elastic member 130 and the conduit seat 120 are in interference fit, and the elastic member 130 abuts against the cover 140, so that they have a guiding effect, realizing concentric assembly, simple assembly, and simplifying the installation process. It should be noted that in an embodiment, a groove can be arranged on the surface of the cover 140 facing the elastic member 130, and one end of the elastic member 130 can be clamped in the groove, further improving the precision of the concentric assembly. In addition, a protrusion can be arranged on the elastic member 130, and a groove matching the protrusion can be arranged on the side wall of the groove, so as to realize clamping, or a groove can be arranged on the elastic member 130, and a matching protrusion can be arranged on the side wall of the groove, playing a guiding role and further improving the precision of the concentric assembly.

[0031] Further, in an embodiment, the conduit seat 120 comprises a first part, a second part and a third part connected in sequence in the axial direction, the maximum cross section of the second part is smaller than the minimum cross section of the first part, the cross section of the second part gradually decreases in the direction towards the base, and the cross section of the third part is the same as the minimum cross section of the second part. That is, the first part of the conduit seat 120 is in a cylindrical structure, the second part is in an inverted circular table structure, and the third part is in a cylindrical structure, wherein the third part extends from the lower surface of the second part. In this embodiment, the groove 121 is provided on the first part, the second part corresponds to the second through hole 112 of the base 110, and the third part corresponds to the first through hole 111 of the base 110. Correspondingly, the cross section of the second through hole 112 of the base 110 gradually decreases in the axial direction from top to bottom. The conduit seat 120 adopts this structure, which is more convenient for cooperation with other components and improves the sealing performance. The conduit seat 120 can be integrally formed.

[0032] Further, in an embodiment, the cross section of the groove 121 gradually decreases in the direction towards the base 110, that is, the cross section of the groove 121 gradually decreases in the axial direction (i.e. the vertical direction) and gradually decreases in the direction from top to bottom. The groove 121 adopts this structure, which plays a guiding role and makes the drug solution in the chamber more easily flow into the third through hole 122.

[0033] In an embodiment, the elastic compression amount of the elastic member 130 is 12%-30%, which ensures the compression sealing of the elastic member 130 and also makes the gap between the elastic member 130 and the groove of the conduit seat 120 remain within an appropriate height. When the elastic compression amount of the elastic member 130 is between 12%-30%, the sealing device can also achieve good sealing effect under a pressure of 600KPa.

[0034] As described above, the drug solution enters the chamber from the base, and then enters the groove 121 through the gap, and then enters the third through hole 122, thereby realizing the infusion of the drug solution. Specifically, in an embodiment, the base 110 has a fourth through hole 113, the central axis of the fourth through hole 113 is perpendicular to the central axis of the second through hole 112, that is, the central axis of the fourth through hole 113 is in the horizontal direction, and the fourth through hole 113 is in communication with the second through hole 112, and the fourth through hole 113 is used for pasting the infusion assembly, so that after the drug solution infusion assembly, the drug solution can enter the chamber from the fourth through hole 113, and the structure is more compact. Further, the area where the fourth through hole 113 of the base 110 is located cooperates with the groove on the side surface of the cover 140 to limit the axial rotation of the cover 140.

[0035] In an embodiment, the outer surface of the base 110 is provided with protrusions 114, and the cover 140 is provided with buckles 141 corresponding to the protrusions 114, so that the detachable connection of the base 110 and the cover 140 is realized through the cooperation of the protrusions 114 and the buckles 141, thereby realizing the interference fit of the base 110 and the cover 140. When the protrusions 114 are buckled with the buckles 141, the elastic member 130 is compressed, so that the elastic member 130 is fixed. At the same time, due to the compression force of the elastic member 130, there is a pre-tightening force between the protrusions 114 of the base and the buckles 141, and such buckle type sealing structure can effectively ensure the interference fit of the base 110 and the cover 140, and can also ensure the sealing of the cavity, i.e., the infusion cavity of the seat, without gluing. Further, the number of the protrusions 114 and the buckles 141 is 3 or more, which further ensures the tightness of the connection of the base 110 and the cover 140. When the number of the protrusions 114 is 3 or more, all the protrusions 114 are uniformly and spacedly arranged along the side surface of the base 110.

[0036] Further, in order to better realize the guiding and positioning of the cover 140, the surface of the base 110 close to the cover 140, i.e., the upper surface, is provided with a guide groove 115, and the cover 140 is provided with a guide member 142 matching the guide groove 115, thereby realizing the guiding cooperation and making the installation of the base 110 and the cover 140 easier. The central axis of the guide groove 115 is on the same straight line as the central axis of the first through hole 111. The guide groove 115 can be an annular groove or the like. In other embodiments, the cover 140 can be provided with the guide groove, and the base can be provided with the corresponding guide member.

[0037] In order for the sealing device to better adhere to the skin surface of the patient, the sealing device can further include a sticking layer 150, which is arranged on the surface of the base 110 away from the cover 140, i.e., the sticking layer 150 is arranged on the lower surface of the base 110. The sticking layer 150 can be connected to the lower surface of the base 110 by gluing or the like. Further, in order to increase the contact between the sticking layer 150 and the lower surface of the base 110, the lower surface of the base 110 can be provided with a rib portion.

[0038] The application also provides a pump infusion device 10, which includes the above sealing device 100, a puncture assembly 200, a soft needle 300, and an infusion assembly. The soft needle 300 is sleeved outside the catheter seat 120, the infusion assembly 400 provides infusion liquid for the base 110, the puncture assembly 200 is connected with the sealing assembly, and the puncture assembly sequentially passes through the cover 140, the elastic member 130, the catheter seat 120, and the soft needle 300.

[0039] Specifically, the soft needle 300 is sleeved outside the lower end of the catheter seat 120, the soft needle 300 is coaxially matched with the catheter seat 120, the soft needle 300 penetrates out of the base 110, that is, part of the structure of the soft needle 300 is located below the base 110. When the catheter seat 120 includes the first part, the second part and the third part, the soft needle 300 is sleeved on the outer surface of the third part. Thus, the medicine enters the soft needle 300 after passing through the third through hole 122 of the catheter seat 120. As known from the above, one end of the catheter seat 120 is arranged in the first through hole 111 of the base 110, so that when the soft needle 300 is sleeved on the outer surface of the catheter seat 120, the soft needle 300 is located between the inner wall of the first through hole 111 and the catheter seat 120, so that the inner wall of the first through hole 111, the catheter seat and the soft needle 300 realize interference fit, thereby fixing the soft needle 300. The soft needle 300 can be made of biocompatible polymer material, which is relatively soft, thereby allowing the patient to maintain a certain degree of freedom of activity while undergoing drug treatment, without worrying about the dangerous situation caused by the breakage of the hard needle, and improving the comfort of the patient.

[0040] In addition, as known from the above, the base 110 has a fourth through hole 113 for pasting the infusion assembly, that is, the infusion assembly is arranged in the fourth through hole 113, so that the medicine delivered by the infusion assembly enters the second through hole 112, then enters the groove of the catheter seat 120 and the third through hole, and finally enters the soft needle 300 to reach the patient's body. Specifically, in an embodiment, the infusion assembly includes an infusion pipeline 410, a connector 420, and a splitter 430. One end of the infusion pipeline 410 is provided with the connector 420, and the other end of the infusion pipeline 410 is arranged in the fourth through hole 113, that is, the other end of the infusion pipeline 410 is pasted to the inner wall of the fourth through hole 113, so as to realize the communication of the medicine delivery path. The splitter 430 is arranged on the infusion pipeline 410. Specifically, the connector 420 is used to be connected with a portable micro-infusion pump, so that the infusion pipeline 410 is communicated with a liquid reservoir inside the portable micro-infusion pump to provide the infusion pipeline 410 with liquid medicine. The connector 420 can be a luer connector or other connectors with similar effects. Further, the setting of the splitter 430 improves the freedom of patient activity. At this time, the infusion pipeline 410 includes two pipeline sections, and the two pipeline sections are connected through the splitter 430. The splitter 430 includes a male end 431 and a female end 432, and the male end 431 and the female end 432 are detachably connected. Specifically, the concentric hole of the male end 431 is provided with a straight needle, and the concentric hole of the female end 432 is provided with a silicone puncture piece. The straight needle of the male end 431 penetrates through the puncture piece of the female end 432. One pipeline section of the infusion pipeline 410 is connected with the male end 431 and the connector 420, and the two are communicated. The other pipeline section of the infusion pipeline 410 is connected with the female end 432, so that the female end 432 is communicated with the second through hole through the other pipeline section, thereby realizing the communication of the entire liquid medicine infusion path. In addition, the female end 432 has a locking device. When the female end 432 is connected with the male end 431, the locking device is locked, so that the female end 432 can withstand a certain static tensile force in the axial direction (i.e., the central axis direction of the infusion pipeline 410) without being disconnected. Since the male end 431 and the female end 432 are detachably connected, the male end 431 and the female end 432 can be protected and cleaned by protective sleeves respectively after being separated.

[0041] In an embodiment, the puncture assembly 200 comprises a puncture base 210 and a puncture needle 220, the puncture needle 220 is arranged on the puncture base 210, and the puncture base 210 is detachably connected with the cover 140. Specifically, the lower surface of the puncture base 210 is adapted to the shape of the upper surface of the cover 140, so that the puncture base 210 and the cover 140 are in close abutment. The puncture base 210 is provided with a shaft hole 211, so that the puncture needle 220 can be arranged in the shaft hole 211, and the puncture needle 220 can be fixed on the inner wall of the shaft hole 221 by adhesion or the like. The puncture needle 220 passes through the cover 140, the through hole of the elastic member 130, the groove and the third through hole of the catheter base 110 in turn, and finally passes through the cavity of the soft needle 300. After the puncture needle 220 passes through the soft needle 300, the end thereof is exposed from the soft needle 300. The end of the soft needle 300 away from the base 110 is pointed, so as to tightly wrap the outer surface of the puncture needle 220.

[0042] Before the drug solution is delivered, the soft needle 300 needs to be inserted into the subcutaneous tissue of the patient, and the specific operation process is as follows: the puncture base 210 is pressed downward by hand, at this time the puncture needle 220 with the soft needle 300 is inserted into the subcutaneous tissue of the patient, then the puncture base 210 is pulled upward, the puncture base 210 with the puncture needle 220 moves upward, so that the puncture needle 220 is taken out, and the soft needle 300 is left in the subcutaneous tissue for drug solution delivery.

[0043] Further, the puncture needle 220 has a side hole which is in communication with the axial hole of the puncture needle 220 and the second through hole, so as to ensure that when the soft needle 300 is inserted into the subcutaneous tissue (the puncture needle is pulled out), air can be discharged through the infusion pipeline, the fourth through hole, the second through hole, the side hole and the axial hole of the puncture needle 220 when the drug fills the entire infusion pipeline.

[0044] Further, in an embodiment, the puncture assembly further comprises a protective sleeve 230 which is detachably connected with or abuts against the base 110, and the protective sleeve 230 is used for protecting the end of the puncture needle 220 away from the puncture base 210. When the protective sleeve 230 is detachably connected with the base 110, the lower surface of the base 110 can be provided with an annular groove 116, and one end of the protective sleeve 230 can be inserted into the annular groove 116, so that when the pump infusion device is not used, the protective sleeve 230 protects the needle tip of the puncture needle 220, prevents the needle tip from being deformed due to collision, and prevents the needle tip from hurting people.

[0045] The pump infusion device 10 has a buckle type sealing device, has excellent pressure maintaining effect, can play a good sealing effect under a pressure of 600 KPa, the components of the sealing device are concentrically assembled and guided and positioned, and quick assembly is realized. The soft needle is used to complete subcutaneous drug solution infusion, and the pump infusion device is matched with the splitter, so as to improve the use experience and life quality of the patient.

[0046] It should be noted that in the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0047] It should also be noted that the above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or modification of the above disclosure by the person skilled in the art belongs to the protection scope of the present application. Obviously, those skilled in the art can make various modifications and changes to the application without departing from the spirit and scope of the application. Thus, if these modifications and changes are within the scope of the present application and its equivalent technology, the present application also intends to include these modifications and changes.

Claims

1. A sealing device, characterized in that The sealing device comprises a base, a catheter seat, an elastic member and a cover, the base is detachably connected with the cover, the catheter seat and the elastic member are located between the base and the cover, the elastic member is arranged on the catheter seat, the base has a first through hole and a second through hole which are coaxially arranged and are in communication in the axial direction, one end of the catheter seat is arranged in the first through hole, the catheter seat is in interference fit with the inner wall of the first through hole, the elastic member is in interference fit with the inner wall of the second through hole, the cover is in abutment with the elastic member, the catheter seat has a groove, the bottom of the groove has a third through hole which penetrates the catheter seat, a cavity is formed between the elastic member and the base, and a gap is formed between the elastic member and the surface of the catheter seat on which the groove is arranged.

2. The sealing device of claim 1, wherein The outer surface of the base is provided with a protrusion, and the cover is provided with a buckle corresponding to the protrusion.

3. The sealing device according to claim 1 or 2, characterized in that A guide groove is arranged on the surface of the base close to the cover, and a guide member which is adapted to the guide groove is arranged on the cover.

4. The sealing device of claim 1, wherein The catheter seat comprises a first part, a second part and a third part which are sequentially connected in the axial direction, the maximum cross section of the second part is smaller than the minimum cross section of the first part, the cross section of the second part gradually decreases in the direction towards the base, and the cross section of the third part is the same as the minimum cross section of the second part.

5. The sealed device of claim 1, wherein, The cross section of the groove gradually decreases in the direction towards the base.

6. The sealed device of claim 1, wherein, The elastic compression amount of the elastic member is 12%-30%.

7. The sealed device of claim 1, wherein, The sealing device further comprises a sticking layer which is arranged on the surface of the base away from the cover, and / or The base has a fourth through hole, the central axis of the fourth through hole is perpendicular to the central axis of the second through hole, and the fourth through hole is in communication with the cavity.

8. A pump infusion set, characterized by The sealing device comprises a puncture assembly, a soft needle, an infusion assembly and the sealing device as claimed in any one of claims 1-7, the soft needle is sleeved outside the catheter seat, the infusion assembly is connected with the base and provides infusion liquid for the base, and the puncture assembly is connected with the sealing device and sequentially penetrates the cover, the elastic member, the groove of the catheter seat and the soft needle.

9. The pump infuser of claim 8, wherein, The puncture assembly comprises a puncture base and a puncture needle, the puncture needle is arranged on the puncture base, and the puncture base is detachably connected with the cover, and / or The base has a fourth through hole, the central axis of the fourth through hole is perpendicular to the central axis of the second through hole, and the fourth through hole is in communication with the cavity, the infusion assembly comprises an infusion pipeline, a connecting head and a switch, one end of the infusion pipeline is provided with the connecting head, the other end of the infusion pipeline penetrates the fourth through hole, and the switch is arranged on the infusion pipeline.

10. The pump infusion set of claim 9, wherein, The puncture assembly further comprises a protective sleeve which is detachably connected with the base or is in abutment with the base, and the protective sleeve is used for protecting the end of the puncture needle away from the puncture base.

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