CN109273891B

CN109273891B - Connector for glucometer

Info

Publication number: CN109273891B
Application number: CN201811272336.8A
Authority: CN
Inventors: 张洛奎; 姚泽林
Original assignee: FCI Nantong Ltd
Current assignee: FCI Nantong Ltd
Priority date: 2018-09-26
Filing date: 2018-10-29
Publication date: 2023-12-01
Anticipated expiration: 2038-10-29
Also published as: CN109273891A; CN209418823U

Abstract

The application discloses a connector for a glucometer, which comprises a base body and a plastic shell, wherein a sealing glue part is arranged in an assembly gap between the base body and the plastic shell, the base body comprises a plastic base, a grounding terminal, a plurality of signal terminals, a detection mechanism and a metal limiting wall, the grounding terminal, the signal terminals, the detection mechanism and the metal limiting wall are embedded in the plastic base, the detection mechanism comprises a first detection terminal, a second detection terminal and a shrapnel terminal which are arranged at intervals along the length direction of the base body, a plastic insert is arranged between the first detection terminal and the shrapnel terminal, the plastic insert is fixedly connected to the first detection terminal, and the plastic shell comprises a connecting part, and a sealing ring is sleeved on the connecting part. The connector for the glucometer has reliable waterproof function and switch detection function, optimizes the signal detection feedback performance of the connector, can be plugged and unplugged for hundreds of thousands of times, and prolongs the service life of the glucometer.

Description

Connector for glucometer

Technical Field

The present application relates to a connector for a blood glucose meter.

Background

In the prior art, the fourth generation glucometer adopts glucose oxidase as oxidase, and has the characteristics of high specificity and mature technology, but because the reaction process needs the participation of oxygen, the measurement result is easily influenced by the oxygen content of blood to cause the deviation of the result; the test paper is also easy to react with oxygen in the air, and generally should be used up within 3-4 months after unsealing. In addition, glucose monitoring systems of glucose oxidase glucometer technology also react with drugs such as uric acid, acetaminophen and in vivo metabolites, producing spurious results.

Currently, the fifth generation of glucometers are also the most competitive and technically leading high-tech products in the current glucometer industry, and the technology adopted by the fifth generation of glucometers is not interfered by other sugar substances in blood any more through the improved glucose dehydrogenase technology.

The existing connector for the fifth generation of glucometer has poor tightness of the internal cavity structure and weak waterproof performance, and once the connector enters the glucometer, the connector cannot work normally; the existing connector is simple in structure and single in function, and generally has only a signal transmission function, and the conventional plug-resistant times of the connector are generally ten thousand times, so that the service life of the connector is short.

Disclosure of Invention

In view of the above, the present application provides a connector for a blood glucose meter that solves the above-mentioned problems.

A connector for a blood glucose meter comprises a base body and a plastic shell assembled outside the base body;

wherein,

the base body comprises a plastic base, a grounding terminal embedded in the plastic base, a plurality of signal terminals, a detection mechanism and a metal limiting wall;

the detection mechanism comprises a first detection terminal, a second detection terminal and a spring plate terminal which are arranged at intervals along the length direction of the substrate, a plastic insert is arranged between the first detection terminal and the spring plate terminal, and the plastic insert is fixedly connected to the first detection terminal;

a sealant part is arranged in an assembly gap between the base body and the plastic shell;

the plastic shell comprises a connecting part, and a sealing ring is sleeved on the connecting part.

Further, the substrate comprises a first side, a second side and a signal transmission end, wherein the first side and the second side are oppositely arranged along the width direction of the substrate, and the card insertion end and the signal transmission end are oppositely arranged along the length direction of the substrate; the detection mechanism is arranged on the first side, the metal limiting wall is arranged on the second side, and the grounding terminal and the signal terminal extend between the card inserting end and the signal transmission end.

Further, the grounding terminal and the plurality of signal terminals are embedded on the plastic base through an insert injection molding process; the plastic insert is molded on the first detection terminal through an insert injection molding process.

Further, at the signal transmission end, the grounding terminal, the plurality of signal terminals, the first detection terminal and the second detection terminal are protruded outside the plastic shell; a plurality of arc-shaped bulges are arranged on one side of the grounding terminal, which is positioned at the card inserting end.

Further, the first detection terminal, the second detection terminal and the spring piece terminal are high-elasticity metal stamping parts.

Further, the plastic insert comprises a fixed end connected to the first detection terminal and a free end arranged opposite to the fixed end, and the free end is arranged as an arc-shaped bulge; the elastic piece terminal is provided with an elastic arm, one side of the elastic arm opposite to the free end is provided with an arc-shaped recess, and the arc-shaped protrusion is abutted against the arc-shaped recess.

Further, the arc angle of the arc-shaped bulge is set to be 50-70 degrees; the arc angle of the arc-shaped concave is set to be 80-120 degrees.

Further, the metal limiting wall comprises a test paper guiding part parallel to the length direction of the matrix.

Further, the sealant portion is molded by the steps of:

a. heating a needle head of a needle cylinder filled with liquid single-component epoxy resin glue, and injecting the liquid single-component epoxy resin glue into the assembly gap by a thruster in the needle cylinder;

b. baking the connector after glue injection in an oven for 30-60 min to solidify the liquid colloid;

wherein the viscosity of the single-component epoxy resin adhesive is 30 Pa.s-50 Pa.s, and the baking temperature is set to 120-200 ℃.

Further, a special-shaped protrusion/recess is arranged on the sealing ring, a special-shaped recess/protrusion is arranged on the connecting part, and the special-shaped protrusion/recess is matched with the special-shaped recess/protrusion.

The beneficial effects are that: according to the connector for the glucometer, the sealing ring is arranged at the connecting part of the connector to realize the sealing between the connector and the mounting shell of the glucometer, the sealing between the inside of the cavity and each terminal is realized in a glue injection curing mode, and the reliable waterproof function is realized due to the double sealing structure of the sealing ring and the glue injection; the detection mechanism is arranged, so that the connector has a switch detection function, and the signal detection feedback performance of the connector is optimized; the setting of metal spacing wall has improved the wear resistance of connector, and in addition high elasticity shell fragment terminal, the setting of detecting the terminal makes the plug-and-pull number of times of connector can reach hundred thousand times, has prolonged the life of glucometer.

Drawings

FIG. 1 is a schematic view showing the external configuration of a connector for a blood glucose meter according to an embodiment of the present application;

FIG. 2 is a schematic exploded view of a connector for a blood glucose meter according to an embodiment of the present application;

FIG. 3 is a schematic diagram showing the structure of a connector for a blood glucose meter according to an embodiment of the present application;

FIG. 4 is a schematic view of the structure of the matrix when the blood glucose test strip is inserted in the embodiment of the present application;

fig. 5 is a schematic view showing a partial structure of the ground terminal according to the embodiment of the present application;

fig. 6 is a schematic structural diagram of the first detection terminal according to an embodiment of the application.

Detailed Description

The application will be further described in the following detailed description in conjunction with the above-described figures.

In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art in a specific case.

The application provides a connector for a blood glucose meter, which is applied to a fifth generation blood glucose meter, is connected between blood glucose test paper and the blood glucose meter, completes signal transmission between the blood glucose test paper and the blood glucose meter, adopts the test paperBlood glucose test paper (FAD glucose dehydrogenase method).

Referring to fig. 1 to 3, fig. 1 shows the external shape of the connector for a blood glucose meter according to an embodiment of the present application, fig. 2 shows the disassembled structure of the connector for a blood glucose meter, the connector for a blood glucose meter includes a base body 10 and a plastic housing 20 assembled outside the base body 10, fig. 3 shows the structure of the base body 10, and the base body 10 includes a first side 101 and a second side 102 opposite to each other along the width direction thereof, and a card insertion end 103 and a signal transmission end 104 opposite to each other along the length direction thereof. The blood glucose test paper 100 is inserted through the card insertion end 103, and signals between the blood glucose test paper and the blood glucose meter are transmitted through the signal transmission end 104.

In this embodiment, the base 10 includes a plastic base 11, a ground terminal 12 embedded in the plastic base 11, a plurality of signal terminals 13, a detecting mechanism and a metal limiting wall 15.

Wherein the ground terminals 12, 13 extend between the card insertion end 103 and the signal transmission end 104. Referring to fig. 4, fig. 4 shows the structure of the substrate 10 when the blood glucose test paper is inserted, and the blood glucose test paper 100 inserted through the card insertion end 103 contacts the ground terminal 12 and the plurality of signal terminals 13, so that the contact areas between the test area for collecting blood samples on the blood glucose test paper 100 and the corresponding signal terminals 13 are precisely positioned.

At the signal transmission end 104, the ends of the ground terminal 12 and the plurality of signal terminals 13 are protruded outside the plastic housing 20, and the ends are welded with the PCB of the blood glucose meter to realize signal transmission between the blood glucose test paper and the blood glucose meter.

Further, the grounding terminal 12 and the plurality of signal terminals 13 are embedded in the plastic base 11 through an insert injection molding process, so that the structural rigidity of the base body 10 is increased, the problem of weak structural rigidity of the existing connector is solved, the turnover of the assembly process is facilitated, and the practicability of the client is improved.

Referring to fig. 5, fig. 5 shows a local enlarged structure of the ground terminal 12, wherein the part of the ground terminal 12 at the card inserting end 103 is formed by finely cutting and punching after the thickness of the local area is thinned by adopting a punching mode, and then the local area is wrapped by plastic through an insert injection molding process, so that the aim of inhibiting easy stripping of metal and plastic under the effect of thermal expansion and cold contraction is achieved, and meanwhile, the rigidity of the injection molding structure is enhanced, so that the connector has the function of preventing high-voltage lightning stroke. In one embodiment, a plurality of arc-shaped protrusions 121 are further disposed on one side of the ground terminal 12 located at the card inserting end 103, so as to increase the contact area between the ground terminal 12 and the injection molding plastic, thereby further improving the connection strength between the ground terminal 12 and the injection molding plastic.

The detecting mechanism is arranged on the first side 101, the metal limiting wall 15 is arranged on the second side 102, and the detecting mechanism enables the connector to have a test paper insertion reminding function by detecting the insertion condition of the blood glucose test paper 100, so that the blood glucose meter applying the connector has the function of a detecting switch, and the signal detecting feedback performance of a measuring system is improved. Specifically, the insertion of the test paper can be prompted by arranging a display component, such as an indicator lamp, connected with the detection mechanism.

In this embodiment, the detecting mechanism includes a spring terminal 143, a first detecting terminal 141 and a second detecting terminal 142 sequentially disposed at intervals along the length direction of the substrate 10, where the ends of the first detecting terminal 141 and the second detecting terminal 142 protrude from the plastic housing 20 at the signal transmitting end 104, and the ends are welded to the PCB of the glucometer.

A plastic insert 1410 is disposed between the first detection terminal 141 and the spring terminal 143, and referring to fig. 6, fig. 6 shows a structure of the first detection terminal 141, and the plastic insert 1410 is fixedly connected to the first detection terminal 141.

With continued reference to fig. 3 and 4, when the blood glucose test paper 100 is inserted from the card inserting end 103, under the limiting and guiding actions of the metal limiting wall 15, one side of the blood glucose test paper 100 is tightly attached to the test paper guiding portion 151 and moves forward along the surface of the test paper guiding portion 151, the other side of the blood glucose test paper 100 contacts with the elastic arm 1430 disposed on the elastic sheet terminal 143, the elastic sheet terminal 143 rotates under the action of movement and interference force, the plastic insert 1410 of the first detection terminal 141 is simultaneously driven, under the action of the swinging force, the front end of the first detection terminal 141 is rotationally deformed, the rotating system is formed, the front end of the first detection terminal 141 contacts with the convex hull 1420 disposed on the front end of the second detection terminal 142, a closed loop is formed between the first detection terminal 141 and the second detection terminal 142, the detection function is opened, and the blood glucose test paper is reminded of being inserted until the front end face of the blood glucose test paper 100 contacts with the plastic insert 16 on the base 11, the front end of the plastic insert 16 stops under the action of the plastic insert 16, and the blood glucose test paper 100 reaches the accurate contact area of the corresponding to the blood glucose test paper 100.

With continued reference to fig. 6, the plastic insert 1410 includes a fixed end 1411 connected to the first detection terminal 141 and a free end 1412 opposite to the fixed end 1411, wherein the free end 1412 is provided with an arc-shaped protrusion, and an arc-shaped recess is provided on a side of the elastic arm 1430 opposite to the free end 1412, and the arc-shaped protrusion abuts against the arc-shaped recess. When the blood glucose test strip 100 is inserted from the card inserting end 103, one side of the blood glucose test strip acts on the side of the elastic arm 1430 away from the free end 1412, and the elastic arm 1430 drives the plastic insert 1410 abutted thereon to push the first detection terminal 141 to swing, so that a closed loop is formed between the first detection terminal 141 and the second detection terminal 142.

Through repeated experiments and verification of the inventor, when the arc angle of the arc-shaped protrusion is smaller than 50 degrees and the arc angle of the arc-shaped recess is smaller than 80 degrees, the uniformity and stability of thrust transmission between the elastic sheet terminal 143 and the first detection terminal 141 are poor, the abrasion between the plastic insert 1410 and the elastic arm 143 is serious, and the service life of the detection mechanism is shortened; when the arc angle of the arc-shaped protrusion is larger than 70 degrees and the arc angle of the arc-shaped recess is larger than 120 degrees, the detection sensitivity of the detection mechanism is reduced. Therefore, in order to ensure the detection sensitivity of the detection mechanism, uniformity and stability of the thrust transmission between the spring terminal 143 and the first detection terminal 141, and to extend the service life of the detection mechanism, in this embodiment, the arc angle of the arc-shaped protrusion is set to 50 ° to 70 °, preferably 65 °, and the arc angle of the arc-shaped recess is set to 80 ° to 120 °, preferably 100 °.

In this embodiment, the plastic insert 1410 is formed on the first detection terminal 141 by an insert injection molding process, and the plastic insert 1410 and the first detection terminal 141 are of an integral structure, so that the assembly process of the connector is simplified, the assembly man-hour is shortened, and the plastic insert 1410 is not easy to undergo position migration in the turnover and assembly processes, so that the connector can be effectively prevented from being blocked and lost.

The metal limiting wall 15 includes a test paper guide 151 parallel to the longitudinal direction of the base 10. When the blood glucose test paper 100 is inserted from the card inserting end 103, the free moving range is very large, and the limiting and guiding actions of the metal limiting wall 15 enable the contact area between the test area for collecting blood samples on the blood glucose test paper 100 and the corresponding contact areas of the plurality of signal terminals 13 to achieve the effect of accurate positioning, so that the accurate value of blood sample detection can be identified and evaluated rapidly with high sensitivity.

In this embodiment, since the internal cavity of the connector is sealed, in order to avoid scraping, generating and residual plastic dust on the plastic wall of the internal cavity caused by the corner angle of the blood glucose test paper 100 during the plugging process, a metal piece with good wear resistance is used as a limiting wall to avoid the risk, thereby enhancing the reliability of the contact performance of the connector.

The first detection terminal 141, the second detection terminal 142 and the spring plate terminal 143 are all formed by stamping high-elasticity metal materials, and the wear resistance of the connector is improved by the arrangement of the metal limiting wall 15, so that the number of plugging and unplugging resistance of the connector can reach hundreds of thousands times, and the service life of the connector is prolonged.

Preferably, the first detection terminal 141, the second detection terminal 142, and the spring piece terminal 143 are stamped from high-elasticity metals such as phosphor bronze, beryllium copper, or titanium copper; the metal limiting wall 15 is made of stainless steel with high wear resistance.

In this embodiment, a sealant portion 30 is disposed in an assembly gap between the base 10 and the plastic housing 20, and the sealant portion 30 is used to prevent water molecules from penetrating into each terminal area inside the connector through the assembly gap between the plastic structures after water enters the internal sealed cavity of the connector, so as to achieve the purpose of waterproof inside the connector.

Further, the sealant 30 is formed by curing a single-component epoxy resin glue with shock resistance and cracking resistance, specifically, firstly, a needle head of a syringe filled with the liquid single-component epoxy resin glue is heated, the liquid single-component epoxy resin glue is injected into the assembly gap by a thruster in the syringe, and a connector after the glue injection is heated and dried by using a drying device, so that the liquid single-component epoxy resin glue is cured, and the sealing and waterproof effects are achieved.

The inventor finds that the problem that the liquid single-component epoxy resin glue flows and is not solidified under a tiny gap by adopting the glue injection sealing technology when the technical scheme of the application is implemented. The inventor of the present application found after team researches that the width of the narrowest part of the assembly gap is only 10 μm, and the main agent part of the liquid single-component epoxy resin glue is penetrated into the gap due to capillary phenomenon, and the curing agent part is not penetrated, so that a phenomenon that a small amount of glue can not be cured still occurs after drying, and the sealing waterproof effect of the connector is weakened. After repeated experiments and verification by the inventor team, the viscosity of the liquid single-component epoxy resin adhesive and the drying technological parameters of the connector after the adhesive injection are optimized, the problem of non-solidification of the adhesive in a narrow gap is thoroughly solved, the technical bottleneck is overcome, and the technical blank of the problem of non-solidification of the single-component epoxy resin sealant flowing in a small gap is filled.

The viscosity of the optimized liquid single-component epoxy resin adhesive and the drying technological parameters of the connector after adhesive injection are as follows: the sealing part 30 is formed by adopting single-component epoxy resin glue with the viscosity of 30 Pa.s-50 Pa.s, the baking time of the connector after glue injection in a drying oven is 30-60 min, and the baking temperature is set to 120-200 ℃ so as to solidify the liquid colloid.

In a preferred embodiment, the sealing part 30 is formed by using a single-component epoxy resin glue with the viscosity of 45 Pa.s, and the connector for the glucometer after glue injection is baked in a blowing drying oven with the model DHG-9053A and the baking temperature controlled range of 0-250 ℃ for 50min, and the baking temperature is set to 170 ℃ to solidify the liquid colloid. Through detection of a COSMO air leakage detector LS-R700, under the condition that the test pressure is 13 kPa+/-1 kPa, the air leakage amount of the connector for the blood glucose meter is 0.001mL/min, and the sealing grade of the connector for the blood glucose meter can reach IP67, so that the connector for the blood glucose meter has good waterproof performance.

In this embodiment, the plastic housing 20 includes a connection portion 21 for connecting the connector to the glucose meter mounting housing, and a sealing ring 22 is sleeved on the connection portion 21. The sealing ring is designed to meet the sealing purpose between the connector and the mounting shell, and prevent water vapor or other unknown liquid at the periphery of the connector from entering the internal terminal area to cause the glucometer to work abnormally. Preferably, the seal ring 22 is made of high temperature resistant fluororubber or silicone rubber.

Further, the sealing ring 22 is provided with a special-shaped protrusion 220, the connecting portion 21 is provided with a special-shaped recess 210, the special-shaped protrusion 220 is matched with the special-shaped recess 210, so that an error-proof installation effect is achieved, and meanwhile, the sealing ring 22 is prevented from affecting a sealing effect due to abnormal rotation of the sealing ring 22 on the connecting portion 21.

It will be appreciated that in other embodiments of the application, a profiled recess may be provided in the sealing ring 22 and a profiled protrusion may be provided in the connecting portion 21, the profiled recess and the profiled protrusion being mutually matched.

The connector for the glucometer provided by the embodiment adopts a double sealing mode of glue injection and a sealing ring, so that the waterproof function and the waterproof reliability of an inner mechanism and an outer mechanism of the connector are ensured.

In this embodiment, metal lugs 23 are further disposed on two sides of the plastic housing 20, and the metal lugs 23 are used for positioning the connector and fixing the connector on the blood glucose meter, specifically, the metal lugs 23 are welded to a PCB board of the blood glucose meter.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. A connector for a blood glucose meter, comprising a base and a plastic housing fitted outside the base;

wherein,

the detection mechanism comprises a first detection terminal, a second detection terminal and a spring plate terminal which are arranged at intervals along the width direction of the substrate, and the first detection terminal, the second detection terminal and the spring plate terminal extend along the length direction of the substrate; a plastic insert is arranged between the first detection terminal and the elastic sheet terminal, and the plastic insert is fixedly connected to the first detection terminal;

the plastic shell comprises a connecting part for connecting the connector with a mounting shell of the glucometer, and a sealing ring is sleeved on the connecting part;

the base body comprises a first side, a second side and a card inserting end, wherein the first side and the second side are oppositely arranged along the width direction of the base body, and the card inserting end and the signal transmission end are oppositely arranged along the length direction of the base body; the detection mechanism is arranged on the first side, the metal limiting wall is arranged on the second side, and the grounding terminal and the signal terminal extend between the card inserting end and the signal transmission end;

at the signal transmission end, the tail ends of the grounding terminal, the plurality of signal terminals, the first detection terminal and the second detection terminal are arranged outside the plastic shell in a protruding mode; a plurality of arc-shaped bulges are arranged on one side of the grounding terminal, which is positioned at the card inserting end, so that the connection strength between the grounding terminal and the plastic base is improved;

the first detection terminal, the second detection terminal and the spring piece terminal are all formed by punching phosphor bronze or beryllium copper or titanium copper;

the plastic insert comprises a fixed end connected to the first detection terminal and a free end arranged opposite to the fixed end, and the free end is arranged to be an arc-shaped bulge; an elastic arm is arranged on the elastic sheet terminal, an arc-shaped concave is arranged on one side of the elastic arm opposite to the free end, and the arc-shaped protrusion is abutted against the arc-shaped concave;

the arc angle of the arc-shaped bulge is set to be 50-70 degrees; the arc angle of the arc-shaped concave is set to be 80-120 degrees;

the metal limiting wall comprises a blood glucose meter test paper guide part parallel to the length direction of the matrix, and is made of stainless steel;

the sealant part is formed by the following steps:

b. baking the connector after glue injection in an oven for 30-60 min to solidify the liquid single-component epoxy resin glue;

wherein the viscosity of the liquid single-component epoxy resin adhesive is 30 Pa.s-50 Pa.s, and the baking temperature is set to 120-200 ℃.

2. The connector for a blood glucose meter of claim 1, wherein the ground terminal, the plurality of signal terminals are embedded on the plastic base by an insert molding process; the plastic insert is molded on the first detection terminal through an insert injection molding process.

3. The connector for a blood glucose meter of claim 1, wherein a profiled protrusion or recess is provided on the sealing ring, and a profiled recess or protrusion is provided on the connecting portion, the profiled protrusion or recess being mutually matched with the profiled recess or protrusion.