Injection device for implanting analyte sensor

Abstract

An injection device for implantation of an analyte sensor includes an introducer needle, an introducer needle holder, and a monitor holder. The introducer needle is used to assist the analyte sensor in entering the substrate. A first clamping part is arranged on the guide needle bracket; the monitor support is provided with a second clamping part, and the guide needle support and the monitor support are movably connected in a sleeved mode. A first position and a second position are arranged between the guide needle support and the monitor support. In the first position, the first clamping part is located between the second clamping part and the needle point of the guide needle, and the first clamping part and the second clamping part are distributed at intervals. And at the second position, the first clamping part is in contact with the second clamping part. When the injection device is used, the monitor support can independently move towards the side close to the base body, and after the second clamping part makes contact with the first clamping part, the monitor support and the guide needle support can synchronously move. Through the movement sequence of the monitor support and the guide needle support and the cooperation of the second clamping part and the first clamping part, the use process of the injection device is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an injection device for implanting an analyte sensor. Background Art

[0002] As people's material life improves, the number of diabetic patients is also growing. Diabetes may cause many complications such as coma, poisoning, neuropathy, cardiovascular and cerebrovascular diseases, so diabetic patients need to know whether their glucose levels are within a safe range. However, the traditional measurement method is cumbersome to use, deep wounds, obvious pain, and can only measure a single value, which makes it impossible for diabetic patients to understand their glucose levels in real time. In order to enable diabetic patients to understand their glucose levels in real time, some patients choose to wear analyte sensors. When wearing analyte sensors, an injection device is required. The analyte sensor is inserted into the human body through the guide needle of the injection device so that the analyte sensor contacts the body fluid.

[0003] The existing injection device includes a guide needle bracket and a monitor bracket, a guide needle is fixed on the guide needle bracket, and a monitor is fixed on the monitor bracket. When the injection device is used, the monitor bracket and the guide needle bracket move synchronously. When the monitor bracket and the guide needle bracket move synchronously, in order to avoid interference with the use of the monitor later, it is necessary to move the guide needle bracket to the side away from the human skin or retract a distance before the monitor is fixed on the human skin after the monitor bracket and the guide needle bracket move synchronously. The process of moving the guide needle bracket alone increases the complexity of using the injection device. Summary of the invention

[0004] The present application provides an injection device for implanting an analyte sensor, the main purpose of which is to simplify the use process of the injection device.

[0005] In one embodiment of the present application, an injection device for implanting an analyte sensor is provided, comprising:

[0006] A guide needle, used to assist the analyte sensor to enter the matrix;

[0007] A guide needle bracket, on which a first clamping portion is provided, and the guide needle is fixed to the guide needle bracket; and

[0008] A monitor bracket, wherein the monitor bracket is provided with a second clamping portion, and the guide needle bracket and the monitor bracket are movably sleeved;

[0009] There is a first position and a second position between the guide needle bracket and the monitor bracket; in the first position, the first clamping portion is located between the second clamping portion and the guide needle tip, and the first clamping portion and the second clamping portion are spaced apart; in the second position, the first clamping portion and the second clamping portion are in contact.

[0010] In one embodiment, it also includes a guide sleeve and a sensor cap, the guide needle is fixed to the guide sleeve, and the guide sleeve is fixed to the guide needle bracket; when in the first position, part of the guide sleeve, part of the guide needle and the sensor cap are all located at the end of the monitor bracket close to the guide needle tip, and the sensor cap and the guide sleeve are socketed, and the axial length of the guide sleeve at the end of the monitor bracket away from the guide needle tip is L1; when in the second position, the axial length of the guide sleeve at the end of the monitor bracket away from the guide needle tip is L2, and L1<L2.

[0011] In one embodiment, it also includes a first elastic member and a sheath; one end of the first elastic member abuts against the guide needle bracket, and the other end of the first elastic member abuts against the monitor bracket, and the first elastic member is in a compressed state; the sheath and the monitor bracket are movably connected, the guide needle bracket is connected to the inner side of the monitor bracket, and the sheath is connected to the outer side of the monitor bracket; a first stop portion is provided on the guide needle bracket, and the first elastic member is located between the first stop portion and the guide needle tip, and when in the first position, the first stop portion abuts against the sheath.

[0012] In one embodiment, a monitoring module is further included; the monitoring instrument bracket includes an assembly plate and a plurality of first plates; the end of the assembly plate close to the guide needle tip is the front end, and the end of the assembly plate away from the guide needle tip is the rear end, and the monitoring module is detachably fixed to the front end; the plurality of first plates are all fixed to the rear end, and the second clamping portion is provided on the first plate; the plurality of first plates enclose an assembly cavity, the guide needle bracket is sleeved in the assembly cavity, and the sheath is sleeved outside the assembly cavity.

[0013] In one embodiment, it also includes a second elastic member, one end of which abuts against the sheath, and the other end of the second elastic member abuts against the rear end of the assembly plate; the second elastic member is in a compressed state, and the second elastic member is used to provide axial movement power to the monitor bracket, so that the monitor bracket can move axially synchronously with the guide needle bracket.

[0014] In one embodiment, it also includes an upper cover, which can be movably sleeved on the outer side of the sheath; the monitor bracket also includes a second plate body, one end of the second plate body is fixed to the rear end, and the other end of the second plate body is provided with a first snap portion; a first snap position is provided on the inner wall of the sheath, and the first snap portion and the first snap position are snap-connected to place the guide needle bracket and the monitor bracket in the first position; a first touch body is provided inside the top of the upper cover, and the first touch body is used to move axially toward the side close to the first snap portion to release the connection between the first snap portion and the first snap position.

[0015] In one embodiment, the monitor bracket also includes a third plate body, one end of the third plate body is fixed to the rear end, and the other end of the third plate body is provided with an abutment surface, and the abutment surface is an inclined slope; a second touch body is also provided inside the top of the upper cover, and the second touch body is used to move axially toward the side close to the abutment surface to abut against the abutment surface; when the second touch body abuts against the abutment surface, the second touch body can give the third plate body a radial outward force and an axial force toward the side close to the front end.

[0016] In one embodiment, the third plate body and the first plate body are connected in the circumferential direction, and the third plate body is provided with a third stop portion on a side close to the sleeve, and the third stop portion is located between the rear end and the abutting surface; the sleeve is provided with a third enclosure portion on a side close to the third plate body, and the third stop portion and the third enclosure portion are parallel and inclined surfaces to each other; in the first position, the third stop portion and the third enclosure portion are axially spaced apart, and when the third stop portion and the third enclosure portion abut against each other, the third enclosure portion is used to assist the second clamping portion and the first clamping portion to separate.

[0017] In one embodiment, a guide structure is provided between the sleeve and the upper cover, and / or a first limiting structure is provided between the sleeve and the upper cover, wherein the first limiting structure is used to limit the relative position between the upper cover and the sleeve.

[0018] In one embodiment, an avoidance groove is provided on the sleeve, and a limiting portion is provided on the outer wall of the assembly plate, part of the limiting portion passes through the avoidance groove and is placed between the sleeve and the upper cover, and the avoidance groove is used for axial movement of the limiting portion; a second limiting structure is provided on the inner wall of the upper cover, and the second limiting structure is used to limit the axial movement range of the limiting portion.

[0019] In one embodiment, it further comprises a lower cover, wherein the lower cover and the upper cover are detachably connected, and an end of the sheath close to the lower cover is used for contacting with the substrate.

[0020] In one embodiment, an anti-rotation structure is provided between the guide needle bracket and the monitor bracket.

[0021] In one embodiment, the guide needle bracket includes an outer ring body, a connector is provided on the outer wall of the outer ring body, one end of the connector is connected to the outer ring body, and the other end of the connector is connected to the guide plate, and the first clamping portion and the first stopping portion are provided on the guide plate; the inner wall of the assembly cavity is provided with either a groove or a ridge, and the outer side wall of the outer ring body is provided with the other of the groove and the ridge, and the groove and the ridge are concave-convexly fitted.

[0022] In one embodiment, a second guide structure is provided between the sheath and the monitor bracket.

[0023] According to the injection device for implanting the analyte sensor in the above-mentioned embodiment, a first clamping portion is provided on the guide needle bracket, a second clamping portion is provided on the monitor bracket, and there are two relative positions between the guide needle bracket and the monitor bracket, namely the first position and the second position. In the first position, the first clamping portion is located between the second clamping portion and the guide needle tip, and the first clamping portion and the second clamping portion are spaced apart. In the second position, the first clamping portion and the second clamping portion are in contact. In this way, when the injection device is used and the monitor bracket moves toward the side close to the substrate, the monitor bracket can first move alone, and the second clamping portion on the monitor bracket continuously approaches the first clamping portion on the guide needle bracket until the second clamping portion and the first clamping portion are in contact, and then the monitor bracket and the guide needle bracket can move synchronously. During this process, the monitor bracket and the guide needle bracket both move in one direction. The relative distance between the monitor bracket and the guide needle bracket can be increased by the sequence of their movement. That is, the guide needle bracket will move or retract relative to the monitor bracket away from the base, thereby effectively simplifying the use of the injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the explosion structure of the injection device in one embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the guide needle bracket in one embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of a monitor bracket in one embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the assembly structure of the guide needle bracket and the monitor bracket in one embodiment of the present application;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the sheath in one embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of a partial three-dimensional structure of an injection device in an embodiment of the present application;

[0030] Figure 7 This is a schematic diagram of the internal structure of the upper cover in one embodiment of the present application;

[0031] Figure 8 This is a schematic diagram of the cross-sectional structure of an injection device in one embodiment of the present application;

[0032] Fig. 9 This is a schematic diagram of the three-dimensional structure of an injection device in one embodiment of the present application;

[0033] Fig.10 This is a schematic diagram of a partial three-dimensional structure of an injection device in an embodiment of the present application;

[0034] Fig.11 This is a schematic diagram of the cross-sectional structure of the initial position of the injection device in one embodiment of the present application (I);

[0035] Fig.12 This is a schematic diagram of the cross-sectional structure of an injection device in one embodiment of the present application during use (I);

[0036] Fig.13 This is a schematic diagram of the cross-sectional structure of the initial position of the injection device in one embodiment of the present application (II);

[0037] Fig.14 This is a schematic diagram of the cross-sectional structure of an injection device in one embodiment of the present application during use (II);

[0038] Fig.15 This is a schematic diagram of the cross-sectional structure of an injection device in one embodiment of the present application when it is finished being used.

[0039] Description of reference numerals: 10. guide needle, 11. guide sleeve, 20. guide needle bracket, 21. outer ring body, 22. inner ring body, 23. connector, 24. guide plate, 241. first clamping portion, 242. first stopper, 25. ridge, 30. monitor bracket, 31. assembly plate, 31a. front end, 31b. rear end, 311. first guide portion, 3111. first guide groove, 3112. .Second guide groove, 312. Limiting part, 32. First plate, 321. Second holding part, 33. Second plate, 331. First buckle part, 332. Second stopper, 34. Third plate, 341. Abutment surface, 342. Third stopper, 35. Groove, 36. Sleeve, 40. First elastic part, 50. Sheath, 50a. Distal end, 50b. Proximal end, 51. Outer tube, 511. Outer tube guide groove, 512. Second buckle part, 513. Avoidance groove, 514. Second guide part, 5141. First guide column, 5142. Second guide column, 52. Inner tube, 521. First guide rail, 5211. Stop block, 522. Second guide rail, 5221. First buckle position, 5222. First enclosure part, 523. Third guide rail, 5231. Third enclosure part, 524. Raised part, 60. Monitoring module, 61. Sensor cap, 62. Shell, 63. Monitor, 64. Analyte sensor, 65. Applicator, 70. Second elastic member, 80. Upper cover, 81. First trigger body, 82. Second trigger body, 83. Guide edge, 84. First block, 85. Second block, 86. Third block, 87. Third buckle part, 90. Lower cover, 91. Third buckle position, J. Base. DETAILED DESCRIPTION

[0040] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0041] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0042] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0043] like Figure 1-Figure 15 As shown, an embodiment of the present application provides an injection device for implanting an analyte sensor 64 , including: an introducer needle 10 , an introducer needle bracket 20 , and a monitor bracket 30 .

[0044] The guide needle 10 is used to assist the analyte sensor 64 to enter the matrix J (such as human skin).

[0045] The guide needle bracket 20 is provided with a first clamping portion 241 , and the guide needle 10 is fixed to the guide needle bracket 20 , and the guide needle 10 is synchronously driven to move by the guide needle bracket 20 .

[0046] The monitor bracket 30 is provided with a second clamping portion 321 , and the guide needle bracket 20 and the monitor bracket 30 can be movably sleeved.

[0047] There are a first position and a second position relative to the guide needle bracket 20 and the monitor bracket 30. In the first position, the first clamping portion 241 is located between the second clamping portion 321 and the needle tip of the guide needle 10, and the first clamping portion 241 and the second clamping portion 321 are spaced apart. In the second position, the first clamping portion 241 and the second clamping portion 321 are in contact.

[0048] The number of the first clamping parts 241 may be one or more, the number of the second clamping parts 321 may be one or more, and the number of the first clamping parts 241 and the number of the second clamping parts 321 may be the same or different. For example, the first clamping parts 241 are set to 3, and the second clamping parts 321 are set to 1, as long as the second clamping part 321 is aligned with any one of the first clamping parts 241. For another example, the number of the first clamping parts 241 and the second clamping parts 321 is the same, and both are set to multiple, so that the multiple first clamping parts 241 and the multiple second clamping parts 321 correspond one to one, which makes it easier for the monitor bracket 30 to give the guide needle bracket 20 a more stable force, so that the monitor bracket 30 and the guide needle bracket 20 move synchronously and stably.

[0049] The injection device for implanting the analyte sensor 64 in the above embodiment (hereinafter referred to as the injection device) is used, and the first clamping portion 241 is provided on the guide needle bracket 20, and the second clamping portion 321 is provided on the monitor bracket 30. There are two relative positions between the guide needle bracket 20 and the monitor bracket 30, namely the first position and the second position. In the first position, the first clamping portion 241 is located between the second clamping portion 321 and the needle tip of the guide needle 10, and the first clamping portion 241 and the second clamping portion 321 are spaced apart. In the second position, the first clamping portion 241 and the second clamping portion 321 are in contact. In this way, when the monitor bracket 30 moves toward the side close to the substrate J when the injection device is used, the monitor bracket 30 can move alone first, and the second clamping portion 321 on the monitor bracket 30 continuously approaches the first clamping portion 241 on the guide needle bracket 20, until the second clamping portion 321 and the first clamping portion 241 are in contact, and then the monitor bracket 30 and the guide needle bracket 20 can move synchronously. During this process, the monitor bracket 30 and the guide needle bracket 20 both move in one direction. The relative distance between the monitor bracket 30 and the guide needle bracket 20 can be increased by the sequence of their movements. That is, the guide needle bracket 20 will move or retract relative to the monitor bracket 30 away from the base J, thereby effectively simplifying the use of the injection device.

[0050] like Figure 8 As shown, the injection device also includes a guide sleeve 11, a sensor cap 61 and a monitoring module 60. The guide needle 10 is fixed to the guide sleeve 11, and the guide sleeve 11 is fixed to the guide needle bracket 20, that is, the guide needle 10 is indirectly fixed to the guide needle bracket 20 through the guide sleeve 11. Specifically, part of the guide needle 10 is sleeved and fixed in the guide sleeve 11, and the guide sleeve 11 can play a protective sleeve role for the guide needle 10. In the first position, part of the guide sleeve 11, part of the guide needle 10 and the sensor cap 61 are all located at one end of the monitor bracket 30 close to the needle tip of the guide needle 10, and the sensor cap 61 and the guide sleeve 11 are sleeved. The monitoring module 60 includes a monitor 63, and the monitoring module 60 is fixed to one end of the monitor bracket 30 close to the needle tip of the guide needle 10.

[0051] The sensor cap 61 is similar to the sterilization cap of the guide needle 10, and can protect the guide needle 10. In the first position, part of the guide sleeve 11 is inserted into the end of the monitor bracket 30 close to the needle tip of the guide needle 10, which is convenient for installing and fixing the sensor cap 61. When using the injection device, the sensor cap 61 will be removed to expose the guide needle 10. At this time, if the monitor bracket 30 and the guide needle bracket 20 move synchronously, the guide sleeve 11 will first contact the substrate J, and the monitoring module 60 and the substrate J will be separated by a distance, which will affect the use of the monitoring module 60. Correspondingly, some structures need to be designed to assist the retraction of the guide sleeve 11, which will increase the structural complexity and operation complexity of the injection device. Correspondingly, the injection device designed in the present application can increase the relative distance between the monitor bracket 30 and the guide needle bracket 20 by the sequence of movement of the monitor bracket 30 and the guide needle bracket 20, that is, the guide needle bracket 20 (and the guide sleeve 11 thereon) will retract relative to the monitor bracket 30 toward the side away from the base J, thereby effectively simplifying the structure and operation process of the injection device.

[0052] In the first position, the axial length of the guide sleeve 11 at the end of the monitor support 30 away from the needle tip of the guide needle 10 is L1, for example Fig.11 In the second position, the axial length of the guide sleeve 11 at the end of the monitor support 30 away from the needle tip of the guide needle 10 is L2, for example, Fig.12 As shown, L1<L2. L1<L2, reduce the interference degree of the guide sleeve 11 on the use of the monitoring module 60, the larger L2 is, the smaller the influence of the guide sleeve 11 on the use of the monitoring module 60 is. Fig.12 For example, the lower end of the guide sleeve 11 is flush with the lower end of the monitoring bracket, or the lower end of the guide sleeve 11 is recessed relative to the lower end of the monitor bracket 30 away from the needle tip of the guide needle 10 to avoid the guide sleeve 11 affecting the use of the monitoring module 60.

[0053] like Figure 1-Figure 2 as well as Figure 5The injection device further includes a first elastic member 40 and a sheath 50. One end of the first elastic member 40 abuts against the guide needle bracket 20, and the other end of the first elastic member 40 abuts against the monitor bracket 30, and the first elastic member 40 is in a compressed state. The sheath 50 and the monitor bracket 30 are movably connected, the guide needle bracket 20 is connected to the inner side of the monitor bracket 30, and the sheath 50 is connected to the outer side of the monitor bracket 30. A first stopper 242 is provided on the guide needle bracket 20, and the first elastic member 40 is located between the first stopper 242 and the needle tip of the guide needle 10. In the first position, the first stopper 242 abuts against the sheath 50. Correspondingly, a stopper block 5211 is provided on the inner wall of the sheath 50, and the first stopper 242 abuts against the stopper block 5211 on the sheath 50. The relationship between the number of the first stopping portions 242 and the stopping blocks 5211 may be similar to the relationship between the number of the first holding portions 241 and the number of the second holding portions 321 , that is, the number of the first stopping portions 242 and the number of the stopping blocks 5211 may be the same or different.

[0054] For ease of description, one end of the sheath 50 is named as the distal end 50a, and the other end is named as the proximal end 50b. The distal end 50a is used to abut against the substrate J. When the injection device is used, the sheath 50 abuts against the substrate J, the sheath 50 does not move relative to the substrate J, and the monitor bracket 30 moves axially relative to the sheath 50, or the monitor bracket 30 moves toward the side close to the substrate J. Fig.11 As shown, when the second holding portion 321 on the monitor bracket 30 and the first holding portion 241 on the guide needle bracket 20 are not in contact, the stopper 5211 on the sheath 50 applies downward force to the guide needle bracket 20, and the first elastic member 40 (for example, a spring) in a compressed state applies upward force to the guide needle bracket 20. Under the cooperation of the stopper 5211 and the first elastic member 40, the position of the guide needle bracket 20 relative to the sheath 50 remains unchanged. When the monitor bracket 30 continues to move toward the side close to the base J (i.e. Fig.11 The monitor bracket 30 moves downward until the second clamping portion 321 contacts the first clamping portion 241, and the monitor bracket 30 can drive the guide needle bracket 20 to move synchronously toward the side close to the base J. Fig.12 As shown, when the lower end of the monitor bracket 30 moves to be flush or approximately flush with the distal end 50a of the sheath 50, the implantation of the guide needle 10 is completed, that is, the guide needle 10 assists the analyte sensor 64 to enter the human skin. At this time, the analyte sensor 64 is below the skin surface and in contact with the body fluid.

[0055] like Figure 3As shown, specifically, the monitor bracket 30 includes an assembly plate 31 and a plurality of first plates 32. The end of the assembly plate 31 close to the needle tip of the guide needle 10 is the front end 31a, and the end of the assembly plate 31 away from the needle tip of the guide needle 10 is the rear end 31b, and the monitoring module 60 is detachably fixed to the front end 31a. The plurality of first plates 32 are all fixed to the rear end 31b, and a second clamping portion 321 is provided on the first plate 32. The plurality of first plates 32 enclose an assembly cavity, the guide needle bracket 20 is sleeved in the assembly cavity, and the sheath 50 is sleeved outside the assembly cavity. The plurality of first plates 32 enclose an assembly cavity, and the assembly cavity is formed relative to an annular or cylindrical main body, which can not only reduce the weight of the monitor bracket 30, but also facilitate the first stopper 242 on the guide needle bracket 20 to pass through the space in the circumferential direction of the adjacent first plates 32 and abut against the stopper 5211 on the sheath 50.

[0056] like Figure 1 and Figure 8 As shown, the injection device further includes a second elastic member 70, one end of the second elastic member 70 abuts against the sheath 50, and the other end of the second elastic member 70 abuts against the rear end 31b of the assembly plate 31. The second elastic member 70 is in a compressed state, and the second elastic member 70 is used to provide axial movement power to the monitor bracket 30, so that the monitor bracket 30 can move axially synchronously with the guide needle bracket 20. Under the action of the second elastic member 70, power can be provided by the mechanical structure of the injection device itself, so as to facilitate the movement of the monitor bracket 30 and the synchronous movement of the monitor bracket 30 and the guide needle bracket 20, without the user applying power to the monitor bracket 30, thereby simplifying the use process of the injection device. In addition, when the monitor bracket 30 is acted on by the user, it is difficult to guarantee the moving distance of the monitor bracket 30 due to differences in experience, usage methods, etc., that is, it is difficult to guarantee the depth of the guide needle 10 inserted into the human skin. However, by using the injection device of the present application, the preset compression deformation amount of the second elastic member 70 combined with the structure of the injection device can better ensure the consistency of the length of the guide needle 10 inserted into the human skin.

[0057] Specifically, Figure 5 As shown, the sheath 50 includes an outer tube 51 and an inner tube 52 connected to each other, and a second elastic member 70 (for example, a spring) is sleeved and placed in the space between the outer tube 51 and the inner tube 52. Based on the difference in the use scenarios of the outer tube 51 and the inner tube 52, the axial length of the outer tube 51 is greater than the axial length of the inner tube 52. When the sheath 50 includes the outer tube 51 and the inner tube 52, the installation space provided for the second elastic member 70 is convenient for the compact design of the injection device structure and for shortening the axial length of the injection device. In other embodiments, the second elastic member 70 can also be placed between the inner tube 52 and the assembly plate 31, one end of the second elastic member 70 abuts against the inner tube 52, and the other end of the second elastic member 70 abuts against the rear end 31b of the assembly plate 31.

[0058] like Figure 3-Figure 7 In the embodiment of the present application, the injection device further includes an upper cover 80, which can be movably sleeved on the outer side of the sheath 50. The monitor bracket 30 further includes a second plate body 33, one end of which is fixed to the rear end 31b, and the other end of the second plate body 33 is provided with a first buckle portion 331. A first buckle position 5221 is provided on the inner wall of the sheath 50, and the first buckle portion 331 and the first buckle position 5221 are buckled to place the guide needle bracket 20 and the monitor bracket 30 in the first position. A first touch body 81 is provided inside the top of the upper cover 80, and the first touch body 81 is used to move axially toward the side close to the first buckle portion 331 to release the connection between the first buckle portion 331 and the first buckle position 5221.

[0059] The first buckle portion 331 cooperates with the first buckle position 5221, which is equivalent to locking or limiting the position of the monitor bracket 30 relative to the sheath 50. When the position of the monitor bracket 30 is locked or limited, the state of the first elastic member 40 and the second elastic member 70 is also limited, and the position of the guide needle bracket 20 is also limited. When the injection device needs to be used, the sheath 50 is placed against the human skin, such as Fig.11 As shown, the user only needs to press the upper cover 80 toward the human skin to make the first trigger body 81 move axially toward the first buckle portion 331, thereby releasing the connection between the first buckle portion 331 and the first buckle position 5221. When the connection between the first buckle portion 331 and the first buckle position 5221 is released, the monitor bracket 30 will move toward the side close to the human skin under the action of the first elastic member 40 until the second clamping portion 321 on the monitor bracket 30 contacts the first clamping portion 241 on the guide needle bracket 20. The compressed second elastic member 70 continues to drive the monitor bracket 30 and the guide needle bracket 20 to move synchronously until the monitoring module 60 of the monitor bracket 30 contacts the human skin (for example, as shown in FIG. 2 ). Fig.12 As shown), the monitor bracket 30 and the guide needle bracket 20 cannot move further, and at this time the guide needle 10 assists the analyte sensor 64 to enter the human skin.

[0060] like Figure 3 As shown, the second plate body 33 is provided with a first buckle portion 331 on the radial inner side and a second stop portion 332 on the radial outer side. Figure 5 As shown, a first guide rail 521 and a second guide rail 522 are provided on the inner wall of the inner tube 52 of the sheath 50, a stop block 5211 is provided on the first guide rail 521, a first buckle position 5221 is provided at one end of the second guide rail 522 close to the proximal end 50b, and a first enclosure portion 5222 is provided at one end of the second guide rail 522 close to the distal end 50a.

[0061] like Fig.11As shown, initially, the first buckle portion 331 and the first buckle position 5221 are engaged to limit the position of the monitor bracket 30 relative to the sheath 50, and at this time, the second stop portion 332 and the first enclosure portion 5222 are spaced apart in the axial direction. The surfaces of the first buckle portion 331 and the first touch body 81 that are close to each other are inclined slopes. When the upper cover 80 is pressed down and the first touch body 81 moves axially downward, the first touch body 81 and the first buckle portion 331 abut against each other, and the first touch body 81 applies radial outward force and axial downward force to the first buckle portion 331 to release the connection between the first buckle portion 331 and the first buckle position 5221.

[0062] like Fig.12 As shown, under the action of the second elastic member 70, the monitor bracket 30 is moved to the preset position, at which time the implantation of the analyte sensor 64 is also completed, and the second stopper 332 abuts against the first enclosure 5222 to limit the excessive movement of the monitor bracket 30 and prevent unnecessary squeezing damage to human skin. When the monitor 63 moves axially, the second stopper 332 moves within the second guide rail 522.

[0063] like Figure 5 and Figure 7 As shown, the first snap-in position 5221 is two snap-in blocks distributed adjacent to each other in the circumferential direction, there is a gap between the two snap-in blocks, the first snap-in portion 331 is in contact with the end face of the snap-in block, and the first touch body 81 is a T-shaped block, so that the first touch body 81 can pass through the gap formed on the first snap-in position 5221 and press the first snap-in portion 331 toward the distal end 50a.

[0064] The number of the second plate bodies 33 can be one or more, and the second plate body 33 and the first plate body 32 are two independent plate bodies. The second plate body 33 and the first plate body 32 are enclosed to form an assembly cavity, so that the monitor bracket 30 and the guide needle bracket 20 have more contact area and better support. In other embodiments, the second plate body 33 and the first plate body 32 can be an integral structure, or the second plate body 33 and the first plate body 32 are the same plate body, for example, the first clamping portion 241 is set on the side wall of the second plate body 33, so that the second plate body 33 can also play the role of the first plate body 32.

[0065] like Figure 3-Figure 7As shown, in the embodiment of the present application, the monitor bracket 30 also includes a third plate body 34, one end of the third plate body 34 is fixed to the rear end 31b, and the other end of the third plate body 34 is provided with an abutting surface 341, and the abutting surface 341 is an inclined slope. A second touch body 82 is also provided inside the cover top of the upper cover 80, and the second touch body 82 is used to move axially toward the side close to the abutting surface 341 to abut against the abutting surface 341. When the second touch body 82 abuts against the abutting surface 341, the second touch body 82 can give the third plate body 34 a radial outward force and an axial force toward the side close to the front end 31a. Through the cooperation between the second touch body 82 and the abutting surface 341, the force requirement for pressing the upper cover 80 is increased, that is, the user needs a greater force to press the upper cover 80, so that the designed injection device has the function of preventing accidental opening, and avoids the phenomenon of releasing the position lock of the monitor bracket 30 by lightly pressing the upper cover 80.

[0066] like Figure 3 As shown, the third plate 34 is connected to the first plate 32 in the circumferential direction, and the third plate 34 is provided with a third stopper 342 on the side close to the sheath 50, and the third stopper 342 is located between the rear end 31b and the abutting surface 341. A third guide rail 523 is provided on the inner wall of the inner tube 52 of the sheath 50, and a third enclosure 5231 is provided on the third guide rail 523, and the third stopper 342 and the third enclosure 5231 are parallel and inclined surfaces to each other. Fig.13 As shown, in the first position, the third stopper 342 and the third enclosure 5231 are axially spaced apart, and the third stopper 342 can move along the third guide rail 523. Fig.14 As shown, when the third stopper 342 moves downward and contacts the third enclosure 5231, the third enclosure 5231 cooperates with the inclined surface, so that the third enclosure 5231 can provide the third stopper 342 with radial inward force and axial upward force, so as to assist the second clamping portion 321 and the first clamping portion 241 to be staggered radially and spaced axially. When the second clamping portion 321 and the first clamping portion 241 are separated, that is, not in contact, since the first elastic member 40 and the second elastic member 70 are still in a compressed state, at this time, the second elastic member 70 will continue to exert downward force on the monitor bracket 30, but the first elastic member 40 will exert upward force on the guide needle bracket 20, and the guide needle bracket 20 will simultaneously drive the guide needle 10 to move upward, that is, to remove the guide needle 10 from the human skin.

[0067] like Fig.15The monitoring module 60 includes a sensor cap 61, a shell 62, a monitor 63, an analyte sensor 64 and an adhesive patch 65. The monitor 63 is fixed in the shell 62, and the analyte sensor 64 is partially fixed in the shell 62 and partially inserted into the guide needle 10. One end of the shell 62 is detachably fixed to the assembly plate 31, and the other end is bonded to the adhesive patch 65. The end of the adhesive patch 65 away from the assembly plate 31 is used to bond with human skin. After the guide needle 10 is removed from the human skin, the user moves the upper cover 80 upward (i.e., moves it away from the substrate J), ​​the assembly plate 31 will separate from the shell 62, and the monitoring module 60 will be fixed on the substrate J. It can be understood that based on the use requirements of the monitoring module 60, the connection strength between the shell 62 and the assembly plate 31 is lower than the bonding strength between the adhesive patch 65 and the shell 62.

[0068] like Figure 5 As shown, a protrusion 524 is provided on the outer wall of the inner tube 52, and the protrusion 524 corresponds to the position of the guide rail on the inner wall of the outer tube 51. For example, a protrusion 524 is provided on the outer wall of the inner tube 52 corresponding to the position of the first guide rail 521, the second guide rail 522 and the third guide rail 523. The protrusion 524 can maintain the wall thickness of the inner tube 52 where the guide rail is opened, that is, the difference in wall thickness at different circumferential positions of the inner tube 52 is as small as possible, thereby facilitating the structural strength of the inner tube 52.

[0069] like Figure 6-Figure 7 as well as Fig.13 As shown, a guide structure is provided between the sheath 50 and the upper cover 80, for example, an outer tube guide groove 511 is provided on the outer wall of the outer tube 51 of the sheath 50, and a corresponding guide ridge 83 is provided on the inner wall of the upper cover 80, and the outer tube guide groove 511 cooperates with the guide ridge 83 to assist the upper cover 80 to move axially relative to the sheath 50. A first limiting structure is provided between the sheath 50 and the upper cover 80, and the first limiting structure is used to limit the relative position between the upper cover 80 and the sheath 50. For example, a second buckle portion 512 is provided on the outer wall of the outer tube 51 of the sheath 50 near the proximal end 50b, and a first block 84 is provided on the inner wall of the upper cover 80. When assembling the injection device, the sheath 50 is inserted into the upper cover 80, and is buckled and connected with the first block 84 through the second buckle portion 512. At the same time, since the first touch body 81 contacts the first buckle position 5221 or the second touch body 82 contacts the abutment surface 341, the position of the upper cover 80 relative to the sheath 50 can be limited. like Fig.14 As shown, when the upper cover 80 is pressed down, the second buckle portion 512 will not affect the movement of the upper cover 80 .

[0070] like Figure 3-Figure 7As shown, the sleeve 50 is provided with an avoidance groove 513, the outer wall of the assembly plate 31 is provided with a limit portion 312, part of the limit portion 312 passes through the avoidance groove 513 and is placed between the sleeve 50 and the upper cover 80, and the avoidance groove 513 is used for axial movement of the limit portion 312. The inner wall of the upper cover 80 is provided with a second limit structure, and the second limit structure is used to limit the axial movement range of the limit portion 312. Specifically, an avoidance groove 513 is provided on the side wall of the outer tube 51 of the sheath 50, and the second limiting structure is a second block 85 and a third block 86 which are axially spaced and arranged on the inner wall of the upper cover 80. The second block 85 and the third block 86 limit the axial movement range of the limiting portion 312, that is, the axial movement range of the assembly plate 31 (monitor bracket 30) is limited, so that each time the injection device is used, the length of the guide needle 10 inserted into the human skin is consistent, thereby avoiding the occurrence of inconsistent insertion lengths of the guide needle 10 when different users use the injection device, thereby ensuring the use effect of the injection device.

[0071] like Figure 1 As shown, the injection device further includes a lower cover 90, and the lower cover 90 is detachably connected to the upper cover 80, and one end of the sheath 50 close to the lower cover 90 is used to contact the substrate J. Specifically, a third snap-fit ​​portion 87 is provided on the outer wall of the upper cover 80, and a third snap-fit ​​position 91 is provided on the inner wall of the lower cover 90, and the third snap-fit ​​portion 87 is snap-fitted with the third snap-fit ​​position 91 to achieve a detachable connection between the upper cover 80 and the lower cover 90. In other embodiments, the third snap-fit ​​position 91 may be provided on the inner wall of the upper cover 80, and the third snap-fit ​​portion 87 may be provided on the outer wall of the lower cover 90, or the upper cover 80 and the lower cover 90 may be connected by threaded connection, bonding, or the like.

[0072] Preferably, in the embodiment of the present application, an anti-rotation structure is provided between the guide needle bracket 20 and the monitor bracket 30. Figure 2 and Figure 4 As shown, specifically, the guide needle bracket 20 includes an outer ring body 21, a connector 23 is provided on the outer wall of the outer ring body 21, one end of the connector 23 is connected to the outer ring body 21, and the other end of the connector 23 is connected to the guide plate 24, and a first clamping portion 241 and a first stopping portion 242 are provided on the guide plate 24. For example, the first stopping portion 242 is provided at the end of the guide plate 24 away from the front end 31a of the assembly plate 31, and the first clamping portion 241 is provided on the side wall of the guide plate 24. The inner wall of the assembly cavity is provided with either a groove 35 or a ridge 25, and the outer wall of the outer ring body 21 is provided with the other of the groove 35 and the ridge 25. The groove 35 and the ridge 25 are engaged with each other. For example, a groove 35 is provided on the inner wall of the assembly cavity, and a ridge 25 is provided on the outer wall of the outer ring body 21. The number of the grooves 35 is consistent with the number of the ridges 25. For example, both the groove 35 and the ridge 25 are set to three. Taking the ridge 25 as an example, the three ridges 25 are distributed in an array around the axis of the guide needle bracket 20.

[0073] The guide plate 24 can pass through the monitor bracket 30 and the first guide rail 521 for sliding connection. For example, the guide plate 24 passes through the interval between the first plate body 32 and the second plate body 33 and is slidably connected to the first guide rail 521. This structure can initially play an anti-rotation role for the guide needle bracket 20. With the cooperation of the ridge 25 and the groove 35, the position of the guide needle bracket 20 relative to the monitor bracket 30 in the circumferential direction can be further accurately limited to prevent the guide needle bracket 20 from rotating relative to the monitor bracket 30, thereby preventing the guide needle 10 from rotating when the injection device is used, causing pain to the user or increasing trauma to the user.

[0074] like Figure 2-Figure 4 As shown, the guide needle bracket 20 also includes an inner ring body 22, a first elastic member 40 is sleeved in the space between the inner ring body 22 and the outer ring body 21, and the guide sleeve 11 is fixed on the inner ring body 22. A sleeve connector 36 is provided on the assembly plate 31 in the assembly cavity, the outer ring body 21 is sleeved on the outer side of the sleeve connector 36, and a through hole is provided on the assembly plate 31 inside the sleeve connector 36 to facilitate the guide sleeve 11 to pass through. The sleeve connector 36 is, for example, a sleeve ring structure.

[0075] More preferably, a second guide structure is provided between the sheath 50 and the monitor bracket 30. Figure 3-Figure 5 As shown, at least one first guide portion 311 is provided on the outer wall of the assembly plate 31, and at least one second guide portion 514 is provided on the inner wall of the outer tube 51 of the sheath 50. The first guide portion 311 and the second guide portion 514 are provided in a one-to-one correspondence to enhance the smoothness of the axial movement of the monitor bracket 30 relative to the sheath 50. Specifically, the first guide portion 311 includes a first guide groove 3111 and a second guide groove 3112 provided on the side wall of the assembly plate 31, and the second guide portion 514 includes a first guide column 5141 and a second guide column 5142 provided on the inner wall of the outer tube 51. The first guide groove 3111 and the first guide column 5141 are matched in a concave-convex manner, and the second guide groove 3112 and the second guide column 5142 are matched in a concave-convex manner. Here, two sets of guide structures are convenient for ensuring the guiding effect when the monitor bracket 30 moves, and the length of the first guide groove 3111 is L3, the length of the second guide groove 3112 is L4, L4<L3, the length of L4 can be equal to the thickness of the assembly plate 31, and it should be noted here that the length refers to the length in the axial direction of the monitor bracket 30. The length of the first guide groove 3111 is larger, and can cooperate with the first guide column 5141 to ensure the stability of the connection between the monitor bracket 30 and the sheath 50 under the premise of guidance.

[0076] The method of using the injection device designed in this application is described as follows:

[0077] like Figure 9-10As shown, when using the injection device, the user needs to first open the lower cover 90 and remove the lower cover 90 to expose the guide needle 10 and the adhesive 65. At this time, the needle tip of the guide needle 10 is at a distance from the distal end 50a of the sheath 50. This distance ensures that the guide needle 10 will not immediately pierce the skin when the user puts the distal end 50a of the sheath 50 against the human skin. Specifically, the user can rotate the lower cover 90 to unscrew the lower cover 90.

[0078] After the distal end 50a of the sheath 50 is attached to the human skin, Fig.11 As shown, the first holding portion 241 and the second holding portion 321 are spaced apart, the first stop portion 242 abuts against the stop block 5211, the first buckle portion 331 is buckled with the first buckle position 5221, and the first actuating body 81 is adjacent to the first buckle portion 331. Fig.13 As shown, the abutting surface 341 and the third blocking portion 5231 are spaced apart, and the second actuating body 82 contacts the abutting surface 341. Moreover, at this time, the first elastic member 40 and the second elastic member 70 in the injection device are both in a compressed state.

[0079] After the distal end 50a of the sheath 50 is attached to the human skin, the user presses the upper cover 80 toward the side close to the skin. Fig.11 As shown in FIG. 1 , the first triggering body 81 presses the first buckle portion 331 downward, and the monitor bracket 30 moves downward. Fig.13 As shown in FIG. 1 , the second actuating body 82 presses the abutting surface 341 downward, and the monitor 63 is also moved downward. After the monitor 63 moves downward by a certain distance, the second clamping portion 321 is engaged with the first clamping portion 241. Under the action of the second elastic member 70, the monitor bracket 30 and the guide needle bracket 20 are synchronously moved downward by a certain distance. Fig.12 As shown, the second clamping portion 321 is clamped with the first clamping portion 241, as shown in FIG. Fig.14 As shown, the inclined surface of the third stopping portion 342 contacts the inclined surface of the third enclosing portion 5231, and the third enclosing portion 5231 applies radial inward force and axial upward force to the third stopping portion 342, so that the second clamping portion 321 on the first plate body 32 and the first clamping portion 241 on the guide needle bracket 20 are separated. When the second clamping portion 321 is separated from the first clamping portion 241, under the action of the first elastic member 40 in a compressed state, an upward force is applied to the guide needle bracket 20 to realize the needle return operation. In addition, during the needle return process, since an anti-rotation structure is provided between the monitor bracket 30 and the guide needle bracket 20, the guide needle 10 can be retracted into the sheath 50 without rotating. Among them, before the upper cover 80 is pressed, the relative position between the upper cover 80 and the sheath 50 is as shown in FIG. Fig.11 or Fig.13 As shown, after pressing the upper cover 80, the relative position between the upper cover 80 and the sheath 50 is as shown in FIG. Fig.12 or Fig.14shown.

[0080] When the injection device is used, the implantation of the analyte sensor 64 and the return of the guide needle 10 take less than one second from the moment the upper cover 80 is pressed. That is, after pressing the upper cover 80, the user can quickly pull the upper cover 80 away from the skin, and the upper cover 80 will drive the sheath 50 and the monitor 63 to move away from the skin. Fig.15 As shown, the housing 62 of the monitoring module 60 and the mounting plate 31 of the monitor bracket 30 are separated.

[0081] The injection device designed in this application has the following advantages:

[0082] Through the structural design and the set first elastic member 40 and second elastic member 70, the monitor bracket 30 and the guide needle bracket 20 can be moved according to the preset distance. Since the monitor bracket 30 moves first, the preset distance of the monitor bracket 30 will be larger. In this way, when using the injection device, it is not necessary to rely on the user's experience to achieve a consistent guide needle 10 implantation effect, ensure the success rate of guide needle 10 implantation, and avoid the situation where the user lacks experience and the guide needle 10 is implanted excessively or insufficiently. In addition, the designed injection device only needs to press the upper cover 80 to implant the guide needle 10, and there is no need to assemble the injection device, which reduces the difficulty of user use.

[0083] After the guide needle 10 is implanted, the third stopper 342 and the third enclosure 5231 cooperate to release the limit of the monitor bracket 30 and the guide needle bracket 20 and perform the needle return operation. During the entire use process, the guide needle 10 will not be retracted until it reaches the preset moving distance. There is no need to worry about whether the guide needle 10 is retracted too early, thereby ensuring the success rate of the implantation of the guide needle 10.

[0084] An anti-rotation structure is added to the monitor bracket 30 and the guide needle bracket 20, which can prevent the guide needle 10 from rotating during implantation and when the guide needle 10 is retracted. The retraction action of the guide needle 10 is more reliable and less painful.

[0085] The injection device has a simple structure and is easy to operate. Since the guide needle bracket 20 and the sheath 50 are directly provided with an abutment structure (i.e., the first stopper 242 and the stopper block 5211 mentioned above), during assembly, the guide needle bracket 20 only needs to be sleeved on the monitor bracket 30, and then the monitor bracket 30 is sleeved or inserted into the sheath 50, and the first buckle portion 331 and the first buckle position 5221 are snap-connected to realize the assembly of the injection device. No additional jig is required for assembly work, and the designed injection device is relatively easier to assemble.

[0086] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. An injection device for implanting an analyte sensor, characterized in that: include: A guide needle, used to assist the analyte sensor to enter the matrix; A guide needle bracket, wherein the guide needle bracket is provided with a first clamping portion, and the guide needle is fixed to the guide needle bracket; as well as A monitor bracket, wherein the monitor bracket is provided with a second clamping portion, and the guide needle bracket and the monitor bracket are movably sleeved; There is a first position and a second position between the guide needle bracket and the monitor bracket; in the first position, the first clamping portion is located between the second clamping portion and the guide needle tip, and the first clamping portion and the second clamping portion are spaced apart; in the second position, the first clamping portion and the second clamping portion are in contact.

2. The injection device for analyte sensor implantation according to claim 1, characterized in that: It also includes a guide sleeve and a sensor cap, the guide needle is fixed to the guide sleeve, and the guide sleeve is fixed to the guide needle bracket; when in the first position, part of the guide sleeve, part of the guide needle and the sensor cap are all located at the end of the monitor bracket close to the guide needle tip, and the sensor cap and the guide sleeve are sleeved, and the axial length of the guide sleeve at the end of the monitor bracket away from the guide needle tip is L1; when in the second position, the axial length of the guide sleeve at the end of the monitor bracket away from the guide needle tip is L2, and L1<L2.

3. The injection device for analyte sensor implantation according to claim 1, characterized in that: It also includes a first elastic member and a sheath; one end of the first elastic member abuts against the guide needle bracket, and the other end of the first elastic member abuts against the monitor bracket, and the first elastic member is in a compressed state; the sheath and the monitor bracket are movably connected, the guide needle bracket is connected to the inner side of the monitor bracket, and the sheath is connected to the outer side of the monitor bracket; a first stop portion is provided on the guide needle bracket, and the first elastic member is located between the first stop portion and the guide needle tip, and when in the first position, the first stop portion abuts against the sheath.

4. The injection device for analyte sensor implantation according to claim 3, characterized in that: It also includes a monitoring module; the monitor bracket includes an assembly plate and a plurality of first plates; the end of the assembly plate close to the guide needle tip is the front end, the end of the assembly plate away from the guide needle tip is the rear end, and the monitoring module is detachably fixed to the front end; the plurality of first plates are all fixed to the rear end, and the second clamping portion is provided on the first plate; the plurality of first plates enclose an assembly cavity, the guide needle bracket is sleeved in the assembly cavity, and the sheath is sleeved outside the assembly cavity.

5. The injection device for analyte sensor implantation according to claim 4, characterized in that: It also includes a second elastic member, one end of which abuts against the sheath, and the other end of which abuts against the rear end of the assembly plate; the second elastic member is in a compressed state, and the second elastic member is used to provide axial movement power to the monitor bracket, so that the monitor bracket can move axially synchronously with the guide needle bracket.

6. The injection device for analyte sensor implantation according to claim 5, characterized in that: It also includes an upper cover, which can be movably sleeved on the outer side of the sheath; the monitor bracket also includes a second plate body, one end of the second plate body is fixed to the rear end, and the other end of the second plate body is provided with a first snap-in portion; a first snap-in position is provided on the inner wall of the sheath, and the first snap-in portion and the first snap-in position are snap-connected to place the guide needle bracket and the monitor bracket in the first position; a first touch body is provided inside the top of the upper cover, and the first touch body is used to move axially toward the side close to the first snap-in portion to release the connection between the first snap-in portion and the first snap-in position.

7. The injection device for analyte sensor implantation according to claim 6, characterized in that: The monitor bracket also includes a third plate body, one end of the third plate body is fixed to the rear end, and the other end of the third plate body is provided with an abutment surface, and the abutment surface is an inclined slope; a second touch body is also provided inside the top of the upper cover, and the second touch body is used to move axially toward the side close to the abutment surface to abut against the abutment surface; when the second touch body abuts against the abutment surface, the second touch body can give the third plate body a radial outward force and an axial force toward the side close to the front end.

8. The injection device for analyte sensor implantation according to claim 7, characterized in that: The third plate body is connected to the first plate body in the circumferential direction, and a third stop portion is provided on the side of the third plate body close to the sleeve, and the third stop portion is located between the rear end and the abutting surface; a third enclosure portion is provided on the side of the sleeve close to the third plate body, and the third stop portion and the third enclosure portion are parallel and inclined surfaces to each other; in the first position, the third stop portion and the third enclosure portion are axially spaced apart, and when the third stop portion and the third enclosure portion abut against each other, the third enclosure portion is used to assist the second clamping portion and the first clamping portion to separate.

9. The injection device for analyte sensor implantation according to claim 6, characterized in that: A guiding structure is provided between the sheath and the upper cover, and / or a first limiting structure is provided between the sheath and the upper cover, wherein the first limiting structure is used to limit the relative position between the upper cover and the sheath.

10. The injection device for analyte sensor implantation according to claim 6, characterized in that: An avoidance groove is provided on the sleeve, and a limiting portion is provided on the outer wall of the assembly plate. Part of the limiting portion passes through the avoidance groove and is placed between the sleeve and the upper cover, and the avoidance groove is used for axial movement of the limiting portion; a second limiting structure is provided on the inner wall of the upper cover, and the second limiting structure is used to limit the axial movement range of the limiting portion.

11. The injection device for analyte sensor implantation according to claim 6, characterized in that: It also includes a lower cover, which is detachably connected to the upper cover, and one end of the sheath close to the lower cover is used to contact the substrate.

12. The injection device for analyte sensor implantation according to claim 4, characterized in that: An anti-rotation structure is provided between the guide needle bracket and the monitor bracket.

13. The injection device for analyte sensor implantation according to claim 12, characterized in that: The guide needle bracket includes an outer ring body, a connector is provided on the outer wall of the outer ring body, one end of the connector is connected to the outer ring body, and the other end of the connector is connected to the guide plate, and the first clamping portion and the first stopping portion are arranged on the guide plate; the inner wall of the assembly cavity is provided with either a groove or a ridge, and the outer side wall of the outer ring body is provided with the other of the groove and the ridge, and the groove and the ridge are concave-convexly fitted.

14. The injection device for analyte sensor implantation according to claim 3, characterized in that: A second guiding structure is provided between the sheath and the monitor bracket.

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