CN217162774U - Insulin injection pen - Google Patents

Abstract

The utility model discloses an insulin injection pen, include: the pen comprises a pen body, wherein one end of the pen body is provided with an installation part; the pen comprises a pen body, a needle seat, a pen body, a needle, a connecting rod and a connecting rod, wherein one end of the needle seat, which is far away from the pen body, is provided with a needle; the protective cap is provided with an avoiding opening suitable for the needle to pass through, the protective cap is sleeved outside the needle head seat, the protective cap is in sliding fit with the needle head seat, the protective cap can move between a needle exposing position and a protective position along the axial direction of the needle head seat, and the needle head passes through the avoiding opening and extends out of the protective cap at the needle exposing position; in the shielding position, the needle is located within the protective cap. According to the utility model discloses an insulin injection pen, after insulin injection pen accomplishes the injection, can avoid the syringe needle to stab, and need not to overlap the pen cap again, can satisfy clinical care demand and nursing regulation simultaneously, is favorable to guaranteeing insulin injection pen's safety in utilization.

Description

Insulin injection pen

Technical Field

The utility model belongs to the technical field of medical instrument and specifically relates to an insulin injection pen is related to.

Background

Diabetes mellitus is a high-grade disease commonly existing in various age groups, continuous hyperglycemia, long-term metabolic disorder and the like can affect tissues and organs of the whole body, and in the treatment process of diabetes mellitus, insulin injection is a common medical means and is generally performed by adopting an insulin injection pen.

However, in the insulin injection pen in the related art, according to the clinical care requirement, in order to avoid needle stick injuries, the pen cap needs to be sleeved back and then the waste needle needs to be rotated, but according to the care regulation, after the insulin injection pen completes injection, the pen cap cannot be sleeved back, and obviously, the insulin injection pen in the related art cannot meet the clinical care requirement and the care regulation at the same time, and needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an insulin injection pen, accomplish the injection back at insulin injection pen, can avoid the syringe needle to stab, and need not to overlap the pen cap again, can satisfy clinical care demand and nursing regulation simultaneously, be favorable to guaranteeing insulin injection pen's safety in utilization.

According to the utility model discloses insulin injection pen, include: the pen comprises a pen body, wherein one end of the pen body is provided with an installation part; the pen body is provided with a pen body, the pen body is provided with a pen head seat, one end of the pen body, which is far away from the pen body, of the pen head seat is provided with a pen head, and the other end of the pen head seat is provided with an installation cavity which is suitable for being detachably matched with the installation part; the protective cap is provided with an avoiding opening suitable for the needle to pass through, the protective cap is sleeved outside the needle head seat, the protective cap is in sliding fit with the needle head seat, the protective cap can move between a needle exposing position and a protective position along the axial direction of the needle head seat, and the needle passes through the avoiding opening and extends out of the protective cap at the needle exposing position; in the shielding position, the needle is located within the protective cap.

According to the insulin injection pen provided by the embodiment of the utility model, the movable protective cap is arranged, so that when insulin is injected, the protective cap can be adjusted to the needle exposing position to enable the needle head to leak; after the insulin injection is completed, the protective cap can be moved to a protective position, so that the needle head is taken in the protective cap, then the needle head seat and the protective cap can be integrally detached from the pen body, therefore, after the insulin injection pen completes the injection, the needle head puncture can be avoided, the pen cap is not required to be sleeved back, meanwhile, the clinical care requirement and the care regulation can be met, and the safety in use of the insulin injection pen is guaranteed.

The utility model discloses an in some embodiments, syringe needle seat is equipped with the sliding tray, the sliding tray includes first groove section and second groove section, first groove section is in the length direction of installation department extends, the one end of second groove section with deviating from of first groove section the one end of syringe needle links to each other, the other end of second groove section is followed the circumferential direction of insulin injection pen extends, the helmet is equipped with the sliding block, the sliding block be suitable for with first groove section with second groove section sliding fit.

In some embodiments of the present invention, the insulin injection pen further comprises: the needle pop-up mechanism comprises a lock assembly and an elastic piece, the lock assembly is arranged between the needle seat and the installation part to lock or unlock the needle seat, the elastic piece is arranged between the needle seat and the installation part, the elastic piece extends in the axial direction of the installation part and is usually in a compression state, and when the protective cap is in a protection position, the lock assembly is suitable for unlocking the needle seat so that the protective cap and the needle seat pop up under the action of the elastic piece.

In some embodiments of the utility model, the free end of installation department is equipped with annular bulge, annular bulge is injectd the liquid outlet of body of a writing brush, the liquid outlet with the syringe needle intercommunication, the elastic component is located annular bulge with just follow between the inner wall of installation cavity the axis direction of installation department extends, the one end of elastic component with the inner wall of installation cavity links to each other, the other end of elastic component with the installation department links to each other.

In some embodiments of the present invention, one end of the elastic member is bonded to the inner wall of the mounting cavity, and the other end of the elastic member is bonded to the mounting portion, or one end of the elastic member is bonded to the inner wall of the mounting cavity, and the other end of the elastic member is bonded to the mounting portion.

In some embodiments of the present invention, the lock assembly includes a spring member and a lock catch, the outer peripheral wall of the mounting portion is provided with a mounting groove adapted to mount the spring member and the lock catch, the spring member is connected to the bottom wall of the mounting groove and between the lock catches.

The utility model discloses an in some embodiments, syringe needle pop-up mechanism still includes slip post and sliding button, the syringe needle seat is equipped with the ascending mating holes of radial direction of syringe needle seat, the slip post with mating holes sliding fit, the helmet still is equipped with the sliding button who is suitable for along the radial direction removal of helmet, works as when the helmet is in the guard position, sliding button the slip post with the hasp is in relative on the radial direction of installation department.

In some embodiments of the present invention, one side of the latch that deviates from the spring is provided with a hemispherical portion, one end of the needle base that faces the pen body is provided with a guide surface, and the pen body arrives in the direction of the needle head, the guide surface extends in a direction inclined toward the direction close to the axis of the needle base.

In some embodiments of the present invention, the number of the mounting grooves is two, and the mounting grooves are disposed in the radial direction of the mounting portion.

In some embodiments of the present invention, the insulin injection pen further comprises: the pen cap, the pen cap be suitable for with the cooperation of helmet joint is in order to inject accommodation space, the syringe needle is located accommodation space.

In some embodiments of the present invention, the present invention further provides a method for using the insulin injection pen, wherein the method comprises the following steps:

s1: when the protective cap is in the needle exposing position, injection is completed, and then the protective cap is switched to the protective position;

s2: separating the protective cap and the needle seat from the pen body as a whole.

In some embodiments of the present invention, in the above step S2, the step of separating the protective cap from the needle holder as a whole includes separating the protective cap from the pen body by the needle ejecting mechanism, and the step of separating the protective cap from the needle holder as a whole includes ejecting the pen body, wherein the needle ejecting mechanism includes a lock component and an elastic component, the lock component is disposed between the needle holder and the mounting portion to lock or unlock the needle holder, the elastic component is disposed between the needle holder and the mounting portion, the elastic component is in the axial direction of the mounting portion extends and is usually in a compression state, and when the protective cap is in the protection position, the lock component is adapted to unlock the needle holder so that the protective cap and the needle holder are ejected under the action of the elastic component.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a perspective view of an insulin injection pen according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the insulin injection pen shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the insulin injection pen shown in FIG. 1;

FIG. 4 is an exploded schematic view of a needle mount, a protective cap, a needle ejection mechanism, and a pen cap according to one embodiment of the present invention;

FIG. 5 is a schematic view of the assembly of the needle mount, the protective cap, the needle ejection mechanism and the pen cap according to one embodiment of the present invention;

FIG. 6 is an enlarged schematic view at A in FIG. 5;

FIG. 7 is an exploded view of FIG. 5;

figure 8 is a schematic structural view of a needle mount according to one embodiment of the present invention;

fig. 9 is a schematic view of an insulin injection pen according to an embodiment of the present invention, wherein the pen cap is fitted over the protective cap;

FIG. 10 is a schematic view of an insulin injection pen according to an embodiment of the present invention, wherein the pen cap is removed from the protective cap and the protective cap is in the needle exposing position;

FIG. 11 is a schematic view of an insulin injection pen in accordance with one embodiment of the present invention, wherein the protective cap is in the protective position and the lock assembly locks the needle mount;

figure 12 is a schematic view of an insulin injection pen in accordance with one embodiment of the present invention, wherein the protective cap is in the protective position and the lock assembly unlocks the needle mount;

figure 13 is a schematic view of an insulin injection pen in accordance with one embodiment of the present invention, wherein the protective cap and the needle mount are ejected together;

fig. 14 is a schematic view of an insulin injection pen according to another embodiment of the present invention.

Reference numerals:

an insulin injection pen 100;

a pen body 10; a mounting portion 11; an annular projection 12; a mounting groove 13;

a needle base 20; a needle 21; a mounting body 211; a mounting cavity 22; a slide groove 23; a first slot segment 231; a second groove segment 232; a mating hole 24;

a protective cap 30; an avoidance port 31; a slider 32; a slide hole 33; a guide surface 34;

a needle ejection mechanism 40; a lock assembly 41; a spring member 411; a latch 412; a hemispherical portion 413; the elastic member 42; a slide post 43; a slide button 44;

a pen cap 50.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

An insulin injection pen 100 according to an embodiment of the present invention will be described with reference to fig. 1 to 14.

Referring to fig. 1 to 4, an insulin injection pen 100 according to an embodiment of the present invention may include: a pen body 10, a needle base 20 and a protective cap 30.

Referring to fig. 1 and 2, one end (left end in fig. 2) of the pen body 10 is provided with a mounting portion 11, and an injection mechanism (not shown) is provided in the pen body 10, and the injection mechanism is communicated with the needle base 20 through the mounting portion 11.

Referring to fig. 2-4, one end of the needle base 20 (refer to the right end in fig. 2) away from the pen body 10 is provided with a needle 21, and the other end of the needle base 20 is provided with a mounting cavity 22 adapted to detachably mate with the mounting portion 11, for example, the needle base 20 may be connected with the mounting portion 11 by a snap or a threaded connection.

Referring to fig. 5 and 6, the protective cap 30 is provided with an escape opening 31 for allowing the needle 21 to pass through, for example, the needle 21 is connected to the needle holder 20 through a mounting body 211, the diameter of the mounting body 211 is larger than that of the needle holder 20, and the mounting body 211 is adapted to pass through the escape opening 31.

Referring to fig. 2 and 5, the protective cap 30 is externally sleeved on the needle base 20, the protective cap 30 is in sliding fit with the needle base 20, the protective cap 30 is movable along the axial direction (referring to the left-right direction in fig. 2) of the needle base 20 between an exposed needle position and a protective position, and in the exposed needle position (referring to fig. 10), the needle 21 passes through the avoiding opening 31 and extends out of the protective cap 30; in the shielding position (see fig. 11), the needle 21 is located inside the protective cap 30, and the needle 21 is opposed to the escape opening 31 in the axial direction of the mounting portion 11.

It can be understood that, according to the insulin injection pen 100 of the embodiment of the present invention, by providing the movable protective cap 30, when injecting insulin, the protective cap 30 can be adjusted to the needle exposing position to expose the needle 21; after the insulin injection is completed, the protective cap 30 can be moved to the protective position, so that the needle 21 is taken in the protective cap 30, then the needle seat 20 and the protective cap 30 can be integrally detached from the pen body 10, therefore, after the insulin injection pen 100 completes the injection, the needle 21 can be prevented from being punctured, the pen cap 50 does not need to be sleeved back, meanwhile, the clinical nursing requirement and nursing regulation can be met, and the safety in use of the insulin injection pen 100 is guaranteed.

In some embodiments of the present invention, referring to fig. 7 and 8, the needle base 20 is provided with a sliding groove 23, the sliding groove 23 includes a first groove section 231 and a second groove section 232, the first groove section 231 extends in the length direction of the mounting portion 11, one end of the second groove section 232 is connected to one end of the first groove section 231, which is away from the needle 21, the other end of the second groove section 232 extends in the circumferential direction of the insulin injection pen 100, the protective cap 30 is provided with a sliding block 32 (refer to fig. 9), and the sliding block 32 is suitable for sliding fit with the first groove section 231 and the second groove section 232.

It is understood that by making sliding groove 23 have first groove section 231 and second groove section 232, when protective cap 30 is in the needle exposing position, protective cap 30 can be switched between the locked state and the unlocked state by rotating protective cap 30, as shown with reference to fig. 9, sliding block 32 is located at the other end of second groove section 232, and protective cap 30 is in the locked state; referring to fig. 10, the sliding block 32 is located at one end of the second slot segment 232 connected to the first slot segment 231, and the protection cap 30 is in an unlocked state, at which time the sliding block 32 can slide along the first slot segment 231 to move the protection cap 30 to the protection position (refer to fig. 11).

In some embodiments of the present invention, referring to fig. 9 and 10, the insulin injection pen 100 further includes: a needle ejection mechanism 40, the needle ejection mechanism 40 including a lock assembly 41 and an elastic member 42, the lock assembly 41 being disposed between the needle holder 20 and the mounting portion 11 to lock or unlock the needle holder 20, the elastic member 42 being disposed between the needle holder 20 and the mounting portion 11, the elastic member 42 extending in the axial direction of the mounting portion 11 and being normally in a compressed state, the lock assembly 41 being adapted to unlock the needle holder 20 when the shield cap 30 is in the shielding position so that the shield cap 30 and the needle holder 20 are ejected by the elastic member 42 (refer to fig. 11 and 12). For example, the lock assembly 41 may be a solenoid lock or a manual lock.

It will be appreciated that when the shield cap 30 is in the shielding position, the latch assembly 41 may be controlled to unlock the needle mount 20 so that the shield cap 30 and needle mount 20 together spring out under the action of the resilient member 42, thereby facilitating separation between the needle mount 20 and the mounting portion 11; when a new needle holder 20 and a new protective cap 30 are mounted, the lock assembly 41 locks the needle holder 20 and the mounting portion 11, thereby facilitating reliable mounting of the needle holder 20.

In some embodiments of the present invention, referring to fig. 5 and 6, the free end of the mounting portion 11 is provided with an annular protrusion 12, the annular protrusion 12 defines a liquid outlet of the pen body 10, the liquid outlet is communicated with the needle 21, the elastic member 42 is located between the annular protrusion 12 and the inner wall of the mounting cavity 22 and extends along the axis direction of the mounting portion 11, one end of the elastic member 42 is connected with the inner wall of the mounting cavity 22, and the other end of the elastic member 42 is connected with the mounting portion 11. It can be understood that, by providing the annular protrusion 12, reliable limiting of the elastic member 42 can be achieved, which is beneficial to ensuring the reliability of the operation of the elastic member 42.

Alternatively, the elastic member 42 is an annular spring, and the annular spring is disposed around the annular protrusion 12, so that the annular protrusion 12 can serve as a guiding column, which is beneficial to further ensure the reliability of the operation of the elastic member 42.

Alternatively, as shown in fig. 5 and 6, the elastic member 42 is plural, the plural elastic members 42 are arranged at intervals in the circumferential direction of the annular protrusion 12, and a guide post is provided at the center of each spring.

In some embodiments of the present invention, referring to fig. 5 and 6, one end of the elastic member 42 is bonded to the inner wall of the mounting cavity 22, and the other end of the elastic member 42 abuts against the mounting portion 11, it can be understood that when the protective cap 30 and the needle base 20 are ejected under the action of the elastic member 42, the elastic member 42 is ejected along with the protective cap 30 and the needle base 20; alternatively, one end of the elastic member 42 abuts against the inner wall of the mounting cavity 22 and the other end of the elastic member 42 is bonded to the mounting portion 11, it being understood that the elastic member 42 remains on the needle holder 20 when the protective cap 30 and the needle holder 20 are ejected by the elastic member 42. Therefore, the structure is simple, and the needle seat 20 can be reliably ejected.

In some embodiments of the present invention, referring to fig. 5 and 6, the lock assembly 41 includes a spring member 411 and a lock catch 412, the outer peripheral wall of the mounting portion 11 is provided with a mounting groove 13 adapted to mount the spring member 411 and the lock catch 412, and the spring member 411 is connected between the bottom wall of the mounting groove 13 and the lock catch 412. This arrangement provides for convenient and reliable operation of the latch assembly 41.

In some embodiments of the present invention, referring to fig. 5, the needle ejection mechanism 40 further includes a sliding post 43 and a sliding button 44, the needle holder 20 is provided with a fitting hole 24 in a radial direction of the needle holder 20 (refer to fig. 7 and 8), the sliding post 43 is in sliding fit with the fitting hole 24, the protective cap 30 is further provided with a sliding button 44 adapted to move in the radial direction of the protective cap 30, and when the protective cap 30 is in the protective position, the sliding button 44, the sliding post 43 and the lock catch 412 are opposed in the radial direction of the mounting portion 11 (refer to fig. 11 and 12).

For example, as shown in fig. 5, the helmet 30 is provided with a slide hole 33 penetrating the helmet 30 in the radial direction of the helmet 30, the slide button 44 is slidably fitted with the slide hole 33, and optionally, one end of the slide hole 33 facing away from the mounting portion 11 is provided with a stopper adapted to prevent the slide button 44 from coming out. So that the reliability of the operation of the slide button 44 can be secured.

It can be understood that after the injection is completed, the protection cap 30 can be moved from the exposed position to the protection position, and in the protection position, the sliding button 44 can be pressed to drive the sliding column 43 to push the latch 412, so that the latch 412 is disengaged from the needle base 20, and under the elastic force of the elastic member 42, the needle base 20 and the protection cap 30 are ejected together, which is convenient to operate and highly reliable.

In some embodiments of the present invention, referring to fig. 14, a side of the lock catch 412 facing away from the spring is provided with a hemispherical portion 413, one end of the needle base 20 facing the pen body 10 is provided with a guiding surface 34, and the guiding surface 34 extends obliquely toward a direction close to the axis of the needle base 20 in a direction from the pen body 10 to the needle 21 (refer to a direction from right to left in fig. 2). It will be appreciated that by providing needle mount 20 with guide surface 34 adapted to cooperate with hemispherical portion 413, guide surface 34 may press latch 412 into mounting slot 13 when mounting needle mount 20, thereby facilitating mounting of needle mount 20.

In some embodiments of the present invention, referring to fig. 3, there are two mounting grooves 13, two mounting grooves 13 are disposed opposite to each other in the radial direction of the mounting portion 11, there are two needle ejection mechanisms 40, and two needle ejection mechanisms 40 are disposed in one-to-one correspondence with the two mounting grooves 13. It will be appreciated that by providing two needle ejection mechanisms 40 arranged opposite each other in the radial direction of the mounting portion 11, it is advantageous to further ensure reliable ejection of the needle holder 20 and thus reliable operation of the insulin injection pen 100.

In some embodiments of the present invention, referring to fig. 5, the insulin injection pen 100 further comprises: a pen cap 50, the pen cap 50 being adapted to snap-fit with the protective cap 30 to define a receiving space, the needle 21 being located in the receiving space. Therefore, the pen cap 50 is sleeved on the protective cap 30, so that the needle 21 is prevented from being polluted by foreign matters such as dust, and safe injection is guaranteed.

In one specific example of the present invention, referring to fig. 9-13, the operation of the insulin injection pen 100 may be as follows:

referring to fig. 9, when the insulin injection pen 100 is not used, the pen cap 50 is in snap fit with the protective cap 30, the protective cap 30 is in the needle exposing position, the needle 21 is located in the accommodating space, at this time, the sliding block 32 is located at the other end of the second groove section 232, and the protective cap 30 is in the locking state;

referring to fig. 10, before injection with insulin is required, the pen cap 50 is removed for injection, after the injection is completed, the protective cap 30 is rotated by a certain angle along the extending direction of the second groove section 232 to be switched to the unlocked state, and then the protective cap 30 is moved to slide the sliding block 32 along the first groove section 231 (refer to fig. 11), so that the protective cap 30 is moved from the exposed needle position to the protective position;

referring to fig. 12 and 13, by pressing the two slide buttons 44, the lock assembly 41 unlocks the needle holder 20 so that the shield cap 30 and the needle holder 20 are ejected by the resilient member 42, and when it is next time to be used, a new needle holder 20, shield cap 30 and pen cap 50 can be reinstalled. Therefore, after the insulin injection pen 100 completes injection, the needle 21 can be prevented from being punctured, the pen cap 50 does not need to be sleeved back, the clinical nursing requirement and the nursing regulation can be met, and the sanitation and the use safety of the insulin injection pen 100 can be guaranteed.

Other structures and operations of the insulin injection pen 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An insulin injection pen, comprising:

the pen comprises a pen body, wherein one end of the pen body is provided with an installation part;

the pen body is provided with a pen body, the pen body is provided with a pen head seat, one end of the pen body, which is far away from the pen body, of the pen head seat is provided with a pen head, and the other end of the pen head seat is provided with an installation cavity which is suitable for being detachably matched with the installation part;

the protective cap is provided with an avoiding opening suitable for the needle to pass through, the protective cap is sleeved outside the needle head seat, the protective cap is in sliding fit with the needle head seat, the protective cap can move between a needle exposing position and a protective position along the axial direction of the needle head seat, and the needle passes through the avoiding opening and extends out of the protective cap at the needle exposing position; in the shielding position, the needle is located within the protective cap.

2. An insulin injection pen according to claim 1, wherein the needle base is provided with a sliding groove which comprises a first groove section and a second groove section, the first groove section extends in the length direction of the mounting part, one end of the second groove section is connected with one end of the first groove section, which is far away from the needle, the other end of the second groove section extends in the circumferential direction of the insulin injection pen, and the protective cap is provided with a sliding block which is suitable for being in sliding fit with the first groove section and the second groove section.

3. The insulin injection pen according to claim 1, further comprising:

the needle head pop-up mechanism comprises a lock component and an elastic piece, the lock component is arranged between the needle head seat and the installation part to lock or unlock the needle head seat, the elastic piece is arranged between the needle head seat and the installation part, the elastic piece extends in the axial direction of the installation part and is normally in a compression state, and when the protective cap is in a protection position, the lock component is suitable for unlocking the needle head seat so that the protective cap and the needle head seat pop up under the action of the elastic piece.

4. An insulin injection pen according to claim 3, wherein an annular protrusion is arranged at a free end of the mounting portion, the annular protrusion defines a liquid outlet of the pen body, the liquid outlet is communicated with the needle head, the elastic member is located between the annular protrusion and the inner wall of the mounting cavity and extends along the axis direction of the mounting portion, one end of the elastic member is connected with the inner wall of the mounting cavity, and the other end of the elastic member is connected with the mounting portion.

5. The insulin injection pen according to claim 4, wherein one end of the elastic member is bonded to the inner wall of the mounting chamber and the other end of the elastic member abuts against the mounting portion, or wherein one end of the elastic member abuts against the inner wall of the mounting chamber and the other end of the elastic member is bonded to the mounting portion.

6. An insulin injection pen according to claim 3, wherein the lock assembly includes a spring member and a lock catch, the outer peripheral wall of the mounting portion is provided with a mounting groove adapted to mount the spring member and the lock catch, and the spring member is connected between the bottom wall of the mounting groove and the lock catch.

7. An insulin injection pen according to claim 6, wherein the needle ejection mechanism further comprises a slide post and a slide button, the needle holder is provided with a fitting hole in a radial direction of the needle holder, the slide post is slidably fitted with the fitting hole, the shield cap is further provided with a slide button adapted to move in a radial direction of the shield cap, and the slide button, the slide post and the lock catch are opposed in the radial direction of the mounting portion when the shield cap is in the shielding position.

8. An insulin injection pen according to claim 6, wherein the side of the catch facing away from the spring is provided with a hemispherical portion, and the end of the needle holder facing the pen body is provided with a guide surface which extends obliquely in the direction from the pen body to the needle in the direction towards the axis of the needle holder.

9. An insulin injection pen according to claim 6, wherein there are two of the mounting grooves, and the two mounting grooves are disposed opposite to each other in a radial direction of the mounting portion.

10. An insulin injection pen according to any one of claims 1 to 9, further comprising: the pen cap, the pen cap be suitable for with the cooperation of helmet joint is in order to inject accommodation space, the syringe needle is located accommodation space.

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