Training pen for simulating injection

Abstract

The invention relates to a training pen for simulating injection, which comprises a power assembly and a damping piece, the power assembly comprises an actuating unit and a push rod, and the actuating unit can outwards push the push rod to quickly extend out; a spiral groove is formed in the outer wall of the push rod, a first straight groove and a second straight groove are formed in the two ends of the spiral groove respectively, a first sounding surface is formed at the joint of the spiral groove and the first straight groove, and a second sounding surface is arranged at the end, away from the rotating groove, of the second straight groove; the damping part is located on one side of the power assembly and comprises a damping outer ring and a damping inner ring, the damping outer ring is fixedly installed in the shell, the damping inner ring is rotationally arranged in the damping outer ring, and a boss is arranged on the inner wall of the damping inner ring. The push rod is decelerated through the rotary damping piece, so that the influence of abrasion on the decelerating effect is avoided, and the service life of the training pen is prolonged; the boss collides with the spiral groove and the second straight groove to give out a warning tone, the structure of the training pen is optimized, and the manufacturing cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of training devices, and in particular to a training pen for simulating injection. Background Art

[0002] The most common way to administer medication is through injection, typically performed by trained healthcare professionals. In some cases, such as those requiring regular injections, such as many medications like insulin, patients can purchase a pen for self-injection. Initial attempts to use a pen for self-injection often lead to improper operation and drug waste due to a lack of understanding of how the pen works. Consequently, training pens designed to simulate injections have become available.

[0003] However, existing injection training pens mainly rely on the friction between the piston and the damping member through interlocking fitting to simulate the injection action. After long-term friction, the piston is prone to wear, which reduces the friction between the piston and the damping member and fails to achieve the purpose of simulating injection. In addition, in order to achieve the sound prompt of the start and end of the injection, the existing injection training pen needs to be equipped with corresponding sound-generating parts, which makes the injection training pen complex in structure, increases the manufacturing cost and the failure rate in use.

[0004] Based on the above technical problems, the present application proposes a training pen for simulating injection. Summary of the Invention

[0005] The purpose of the present invention is to provide a training pen for simulating injections to solve the technical problems mentioned in the background art. The purpose of the present invention is achieved through the following technical solutions: A training pen for simulating injections comprises a housing, a power assembly, and a damping member. The housing is axially divided into a first end and a second end, the first end of the housing being provided with a port. The power assembly is mounted on the second end of the housing and comprises an actuating unit and a push rod. The actuating unit is configured to rapidly push the push rod toward the first end of the housing along the axial direction of the housing. The push rod has an outer wall having a spiral groove, a first straight groove being formed on a side of the spiral groove proximate the first end of the housing, the first straight groove being connected to the spiral groove, and a first sound-emitting surface being formed at the junction of the spiral groove and the first straight groove. The spiral groove has a second straight groove being formed on a side of the spiral groove proximate the second end of the housing, the second straight groove being connected to the spiral groove, and a second sound-emitting surface being provided on an end of the second straight groove remote from the rotating groove. The damping member is located on a side of the power assembly proximate the first end of the housing and comprises a damping outer ring and a damping inner ring. The damping outer ring is fixedly mounted within the housing, the damping inner ring being rotatably disposed within the damping outer ring, and a boss being provided on the inner wall of the damping inner ring. When the push rod moves toward the first end of the housing, the boss passes through the first straight groove, the spiral groove, and the second straight groove in sequence.

[0006] The locking mechanism is connected with the locking cam at the rear end of the locking cam, and the locking cam is connected with the locking cam at the rear end of the locking cam, so that the locking cam is connected with the locking cam at the rear end of the locking cam.

[0007] Furthermore, it includes a protective shell, which is movably installed in the first end of the shell and can move back and forth along the axial direction of the shell. One end of the protective shell at least partially extends out of the port, and the other end of the protective shell is connected to the actuating unit for driving the actuating unit to operate.

[0008] Furthermore, it includes a bracket, which is installed between the protective shell and the damping member. A channel distributed along the axial direction of the shell is opened in the bracket, and the channel passes through the bracket; a window is set on the side of the bracket.

[0009] Furthermore, an avoidance groove is provided on the side of the bracket, and a limit arm is provided in the avoidance groove. The limit arm is provided along the length direction of the bracket, and the side of the limit arm close to the first end of the shell is a free end, and the inner wall of the limit arm close to the second end of the shell is provided with a protrusion; a limit groove matching the limit arm is provided on the protective shell; the push rod can push the protrusion to make the free end of the limit arm extend into the limit groove.

[0010] Furthermore, the damping outer ring and the damping inner ring form a closed damping cavity, and the damping cavity is filled with a damping medium.

[0011] Furthermore, the actuating unit further comprises a fixing block, the fixing sleeve is fixedly connected to the fixing block, the fixing block is fixedly connected to the housing, and the damping member abuts against the fixing block.

[0012] Furthermore, a dot-shaped protrusion is provided on a surface of the fixing block close to the damping member, and the dot-shaped protrusion abuts against the damping inner ring of the damping member.

[0013] Furthermore, the pen cap is provided with a reset rod.

[0014] Furthermore, a window matching the viewing window is provided on the shell.

[0015] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. The push rod with a spiral groove pushes the damping element to rotate and decelerate the push rod, realizing the simulation of the injection process. This avoids the influence of wear between the push rod and the damping element on the deceleration effect and prolongs the service life of the training pen. 2. By filling the damping medium between the damping inner ring and the damping outer ring, the push rod speed can be adjusted by selecting different damping media, which can realize the simulated injection of different medicines and expand the application range of the training pen; 3. By providing a first straight groove and a second straight groove on both sides of the spiral groove of the push rod, respectively, the collision between the boss and the spiral groove and the second straight groove produces a prompt sound indicating the start and end of injection. No additional sound-emitting parts are required, which reduces the cost of the training pen, optimizes the structure of the training pen, and saves manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the appearance structure of an embodiment of the present application; Figure 2 This is an exploded diagram of an embodiment of the present application; Figure 3 This is a connection diagram of an embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the damping member and the power assembly according to an embodiment of the present application; Figure 5 This is a schematic diagram of the damping member structure of an embodiment of the present application; Figure 6 This is an exploded diagram of the power assembly of an embodiment of the present application; Figure 7 This is a schematic diagram of the push rod structure of an embodiment of the present application; Figure 8 This is a schematic diagram of the fixed block structure of an embodiment of the present application; Figure 9 This is a schematic diagram of the structure of the fixing sleeve according to an embodiment of the present application; Figure 10 This is a schematic diagram of the structure of the sliding sleeve according to an embodiment of the present application; Figure 11 This is a schematic diagram of the locked state of the power assembly of the embodiment of the present application; Figure 12 This is a schematic diagram of the unlocked state of the power assembly according to an embodiment of the present application; Figure 13 This is a schematic diagram of the protective shell structure of an embodiment of the present application; Figure 14 This is a schematic diagram of the bracket structure of the embodiment of the present application; Figure 15 This is a cross-sectional view of the bracket according to the embodiment of the present application; Figure 16 This is a schematic diagram of the position limiting state of the bracket on the protective shell in the embodiment of the present application.

[0018] Reference numerals: 1, housing; 11, front housing; 111, window; 112, first card interface; 113, second card interface; 114, third card interface; 12, rear housing; 121, first clamping block; 122, fourth card interface; 2, protective housing; 21, extension arm; 22, limiting groove; 3, bracket; 31, channel; 32, window; 33, limiting arm; 331, protrusion; 34, fourth clamping block; 4, damping element; 41, damping outer ring; 42, damping inner ring; 421, boss; 43, third clamping block; 5, power assembly; 51, push rod; 511, guide block; 512, spiral groove; 513, first straight groove; 514, second straight groove; a, first sound-emitting surface; b, second sound-emitting surface; 52, main elastic member; 53, fixed block; 531, snap-fit ​​groove; 532, guide groove; 533, second snap-fit ​​block; 534, dot-shaped protrusion; 54, guide pin; 55, fixed sleeve; 551, snap-fit ​​seat; 552, limiting channel; 553, locking groove; 56, sliding sleeve; 561, strip groove; 562, first guide block; 563, second guide block; 564, connecting platform; 6, auxiliary elastic member; 7, pen cap; 71, reset rod. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0020] like Figure 1-3 The training pen for simulating injection shown in FIG. 1 includes a housing 1, a protective shell 2, a bracket 3, a damping member 4, a power assembly 5, an auxiliary elastic member 6 and a pen cap 7. Figure 3As shown, the housing 1 is a cylindrical hollow shell, comprising a front shell 11 and a rear shell 12. The front shell 11 is a tubular structure with left and right openings. Two oval windows 111 are symmetrically provided on the sidewall of the left end of the front shell 11. A first card interface 112, a second card interface 113, and a third card interface 114 are respectively provided on the right end of the front shell 11. The rear shell 12 is a tubular structure with a closed right end. An inwardly contracting step is fixed to the left end of the rear shell 12, to which a first clamping block 121 is fixed. A fourth clamping interface 122 is provided on the right side of the first clamping block 121. The first clamping block 121 of the rear shell 12 is clamped to the first opening 112 of the front shell 11, thereby achieving a fixed connection between the rear shell 12 and the front shell 11.

[0021] like Figure 2 , Figures 6-10 As shown, the power assembly 5 is installed at the right end of the housing 1. The power assembly 5 includes an actuating unit and a push rod 51. The actuating unit can quickly push the push rod 51 to the left along the axial direction of the housing 1. The actuating unit includes a main elastic member 52, a fixing block 53, a fixing sleeve 55 and a sliding sleeve 56.

[0022] like Figure 7 As shown, the push rod 51 is a hollow tubular structure with a closed left end. Two guide blocks 511 are symmetrically fixed to the right end of the push rod 51. The outer wall of the push rod 51 is formed, from left to right, with a first straight groove 513, a spiral groove 512, and a second straight groove 514. The first straight groove 513 and the second straight groove 514 are evenly connected to the spiral groove 512. The left end of the spiral groove 512 is designed with a first sound-emitting surface a, located at the projection of the first straight groove 513 onto the spiral groove 512 along the axial direction of the push rod 51. The right end of the second straight groove 514 is designed with a second sound-emitting surface b.

[0023] like Figure 3 、 Figure 8 As shown, the fixing block 53 is a hollow cylindrical structure with a closed right end. A through hole is defined at the right end of the fixing block 53. The edges of the through hole are defined by two engaging grooves 531 and two guide grooves 532. The engaging grooves 531 and guide grooves 532 are arranged alternately, with the connecting line of the two engaging grooves 531 perpendicular to the connecting line of the two guide grooves 532. Two second engaging blocks 533 are symmetrically secured to the sides of the fixing block 53. These second engaging blocks 533 connect to the fourth engaging interface 122 of the rear housing 12, thereby securing the fixing block 53 to the outer housing 1.

[0024] like Figure 9As shown, the fixing sleeve 55 is a hollow tubular structure with an open left end. Two engaging seats 551 are symmetrically fixed to the open end of the fixing sleeve 55. The engaging seats 551 engage and secure with the engaging grooves 531 of the fixing block 53, thereby connecting the fixing sleeve 55 to the fixing block 53. Two symmetrical limiting channels 552 are mounted on the side of the fixing sleeve 55. The limiting channels 552 extend along the length of the fixing sleeve 55 and communicate with the guide grooves 532 of the fixing block 53. A locking groove 553 is defined at the right end of the fixing sleeve 55. The locking groove 553 connects to the limiting channels 552 via an inclined surface, and the locking groove 553 is partially offset from the limiting channel 552. The guide block 511 of the push rod 51 slides within the limiting channel 552, preventing the push rod 51 from rotating as it moves along the fixing sleeve 55. The guide block 511 can enter the locking groove 553 along the inclined surface.

[0025] like Figure 10 As shown, the sliding sleeve 56 is a tubular structure with both ends open. It is slidably mounted on the outside of the fixed sleeve 55. Two strip grooves 561 are symmetrically defined on the side of the sliding sleeve 56, extending along the length of the sliding sleeve 56. The limiting channel 552 of the fixed sleeve 55 is located within the strip groove 561. A first guide block 562 is mounted at the right end of the strip groove 561. The first guide block 562 extends along the length of the limiting channel 552 and is used to guide the guide block 511 of the push rod 51 from the limiting channel 552 into the locking groove 553. A second guide block 563 is mounted on the side of the strip groove 561, located to one side of the end of the first guide block 562. The second guide block 563 is used to guide the guide block 511 of the push rod 51 from the locking groove 553 into the limiting channel 552.

[0026] like Figure 3 、 Figure 10 As shown, two connecting platforms 564 are fixed to the side of the sliding sleeve 56. An auxiliary elastic member 6 is mounted on the outside of the sliding sleeve 56. The auxiliary elastic member 6 is a compression spring. The left end of the auxiliary elastic member 6 abuts against the connecting platform 564 of the sliding sleeve 56, and the right end of the auxiliary elastic member 6 abuts against the closed end of the rear housing 12. The auxiliary elastic member 6 is used to apply a leftward thrust to the sliding sleeve 56.

[0027] like Figure 6 As shown, the opening of the push rod 51 is slidably assembled into the fixed sleeve 55, with the opening thereof facing the opening of the fixed sleeve 55. A main elastic member 52 is installed between the push rod 51 and the fixed sleeve 55. The main elastic member 52 is used to provide an outward thrust for the push rod 51. The main elastic member 52 is a compression spring. To facilitate the installation of the main elastic member 52, a guide pin 54 is also installed in the fixed sleeve 55.

[0028] like Figure 2-Figure 5As shown, the damping member 4 is mounted at the left end of the power assembly 5. The damping member 4 includes a damping outer ring 41 and a damping inner ring 42. Two third clamping blocks 43 are symmetrically mounted on the side of the damping outer ring 41. The third clamping blocks 43 engage with the second clamping interface 113 of the front shell 11 to achieve a fixed connection between the damping member 4 and the outer shell 1. The damping inner ring 42 is rotatably mounted within the damping outer ring 41. Two bosses 421 are symmetrically mounted on the inner wall of the damping inner ring 42. The bosses 421 are cylindrical structures extending radially along the damping inner ring 42. The inner diameter of the damping inner ring 42 is greater than or equal to the outer diameter of the push rod 51, and the thickness of the bosses 421 is less than or equal to the depth of the spiral groove 512.

[0029] When the actuator unit pushes the push rod 51 to the left, in the first stage, the first straight groove 513 quickly passes through the damping element 4, and the boss 421 of the damping element 4 strikes the first generating surface a, producing an injection start prompt sound. In the second stage, the boss 421 of the damping element 4 enters the spiral groove 512. Under the thrust of the main elastic member 52, the push rod 51 continues to move to the left, thereby driving the damping inner ring 42 to rotate through the boss 421. Due to the force of the damping element 4 in the direction of rotation, the push rod 51 moves at a constant speed to the left, simulating the injection process. In the third stage, when the boss 421 moves out of the spiral groove 512, the boss 421 moves rapidly along the second straight groove 514, and the boss 421 strikes the second sound-generating surface b, producing an injection end prompt sound.

[0030] The spirally grooved push rod decelerates the damping element, simulating the injection process. This prevents wear between the push rod and the damping element from affecting the deceleration effect, extending the life of the training pen. By providing a first and second straight groove on either side of the push rod's spiral groove, the impact of the boss on the spiral and second straight grooves produces a sound signal indicating the start and end of injection. This eliminates the need for a separate sound-generating component, reduces the cost of the training pen, optimizes its structure, and saves manufacturing costs.

[0031] Preferably, the damping outer ring 41 and the damping inner ring 42 form an annular damping chamber 44, which is filled with a damping medium. An annular sealing ring 45 is installed at the connection between the outer and inner rings to prevent leakage of the damping medium. By filling the damping medium between the inner and outer rings, the push rod speed can be adjusted by selecting different damping media, enabling simulated injections of different medications and expanding the applicability of the training pen.

[0032] Preferably, six dot-shaped protrusions 534 are fixed to the left end face of the fixed block 53, and the dot-shaped protrusions 534 abut against the damping inner ring 42 of the damping member 4, thereby reducing the contact area between the damping inner ring 42 and the fixed block 53, reducing the friction between the damping inner ring 42 and the fixed block 53, and avoiding the friction between the damping inner ring 42 and the fixed block 53 affecting the stability of the movement of the push rod 51.

[0033] like Figure 2 、 Figure 13 As shown, protective shell 2 is movably mounted on the left end of housing 1. Protective shell 2 can reciprocate axially along housing 1, with the left end of protective shell 2 at least partially extending out of the port of housing 1. Two extension arms 21 are fixed to the right end of protective shell 2. These extension arms 21 define limit slots 22 that extend along their lengths. These extend rightward, contacting the sliding sleeve 56 of power assembly 5. When protective shell 2 is pressed, the extension arms 21 push the sliding sleeve 56 to the right, triggering the actuating unit.

[0034] The working principle of the power assembly 5 is: like Figures 9-11 As shown, in the locked state, the auxiliary elastic member 6 applies a leftward thrust to the sliding sleeve 56 , and the guide block 511 is restricted in the locking groove 553 by the first guide block 562 .

[0035] like Figure 9 、 Figure 10 、 Figure 12 As shown, when unlocking, the sliding sleeve 56 moves to the right under the push of the protective shell 2. When the connection between the limiting channel 552 and the locking groove 553 is offset from the first guide block 562, the main elastic member 52 applies a leftward thrust to the push rod 51. The guide block 511 of the push rod 51 enters the limiting channel 552 under the guidance of the second guide block 563, and the push rod 54 extends quickly to the left.

[0036] like Figure 2 、 Figure 13-16 As shown, the bracket 3 is mounted between the protective shell 2 and the damping member 4. Two fourth engaging blocks 34 are symmetrically mounted on the side of the bracket 3. The fourth engaging blocks 34 engage with the third engaging interface 114 of the front shell 11 to achieve a fixed connection between the bracket 3 and the shell 1. A channel 31 is defined within the bracket 3 and extends axially along the shell 1. The channel 31 penetrates the bracket 3, allowing the push rod 51 to pass through the bracket 3. A viewing window 32 is arranged on the side of the bracket 3 to cooperate with the window 111 on the front shell 11. This allows the position of the push rod 51 to be observed through the viewing window 32, facilitating visual understanding of injection information.

[0037] like Figure 14-16As shown, two symmetrical avoidance grooves are provided on the side of the bracket 3, extending along the length of the bracket 3. A limit arm 33 is mounted within the avoidance groove. The left end of the limit arm 33 is free, and the right end of the limit arm 33 is connected to the main body of the bracket 3. A protrusion 331 is fixed to the inner wall of the right end of the limit arm 33. The distance between the two protrusions 331 is less than the outer diameter of the push rod 5. When the push rod 51 is inserted into the bracket 3, the push rod 51 pushes the limit arm 33 outward via the protrusion 331, causing the limit arm 33 to extend into the limit groove 22, thereby limiting the rightward travel of the protective shell 2.

[0038] like Figure 1 、 Figure 2 As shown, the pen cap 7 is detachably mounted on the left end of the housing 1 by a snap-fitting manner, and a reset rod 71 is mounted in the middle of the pen cap 7. The reset rod 71 is mounted on the pen cap 7 to avoid loss of the reset rod 71.

[0039] like Figures 9-12 As shown, during reset, the reset rod 71 pushes the push rod 51 rightward along the limiting channel 552. The guide block 511 of the push rod 51 pushes the first guide block 562, causing the sliding sleeve 56 to move rightward. When the connection between the limiting channel 552 and the locking slot 553 is offset from the first guide block 562, the reset rod 71 applies a rightward thrust to the push rod 51, and the guide block 511 of the push rod 51 enters the locking slot 553 under the guidance of the first guide block 562. At this point, the end of the first guide block 562 loses support and, under the action of the auxiliary elastic member 6, rapidly moves rightward, colliding with the fixed sleeve 55 and emitting a reset signal. The first guide block 562 now confines the guide block 511 within the locking slot 553, completing the reset of the training pen.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A training pen for simulating injection, characterized in that: include: a housing, the housing being divided into a first end and a second end along its axial direction, the first end of the housing being provided with a port; A power assembly is mounted on the second end of the housing, the power assembly includes an actuating unit and a push rod, the actuating unit can quickly push the push rod toward the first end of the housing along the axial direction of the housing; the outer wall of the push rod is provided with a spiral groove, the spiral groove is provided with a first straight groove on a side close to the first end of the housing, the first straight groove is connected to the spiral groove, and a first sound-emitting surface is formed at the connection between the spiral groove and the first straight groove; the spiral groove is provided with a second straight groove on a side close to the second end of the housing, the second straight groove is connected to the spiral groove, and a second sound-emitting surface is provided on an end of the second straight groove away from the rotating groove; A damping member is located on a side of the power assembly close to the first end of the housing, the damping member includes a damping outer ring and a damping inner ring, the damping outer ring is fixedly installed in the housing, the damping inner ring is rotatably arranged in the damping outer ring, and a boss is provided on the inner wall of the damping inner ring. When the push rod moves toward the first end of the housing, the boss passes through the first straight groove, the spiral groove and the second straight groove in sequence.

2. A training pen for simulating injection according to claim 1, characterized in that: The actuating unit includes a fixed sleeve and a sliding sleeve, the fixed sleeve is a hollow structure with an opening at the head end, the fixed sleeve is fixedly installed in the shell, a limited position channel is provided on the side of the fixed sleeve, and the limited position channel extends along the length direction of the fixed sleeve; a locking groove is provided at the tail end of the fixed sleeve, and the locking groove is connected to the limited position channel; the push rod is a hollow structure with an opening at the tail end, the tail end of the push rod faces the tail end of the fixed sleeve, and a guide block is provided on the side of the tail end of the push rod, and the guide block is slidably arranged in the limited position channel; between the push rod and the fixed sleeve A main elastic member is provided; the sliding sleeve is slidably mounted on the outside of the fixed sleeve, a strip groove is provided on the side surface of the sliding sleeve, the strip groove extends along the length direction of the sliding sleeve, and the limiting channel is located in the strip groove; a first guide block is provided at the end of the strip groove, the first guide block is used to guide the guide block from the limiting channel to the locking groove; a second guide block is provided on the side of the strip groove, the second guide block is used to guide the guide block from the locking groove to the limiting channel; an auxiliary elastic member is provided between the sliding sleeve and the second end of the shell.

3. A training pen for simulating injection according to claim 1, characterized in that: It also includes a protective shell, which is movably installed in the first end of the shell. The protective shell can move back and forth along the axial direction of the shell. One end of the protective shell at least partially extends out of the port, and the other end of the protective shell is connected to the actuating unit for driving the actuating unit to operate.

4. A training pen for simulating injection according to claim 3, characterized in that: It also includes a bracket, which is installed between the protective shell and the damping member. A channel distributed along the axial direction of the shell is opened in the bracket, and the channel passes through the bracket; a window is set on the side of the bracket.

5. A training pen for simulating injection according to claim 4, characterized in that: An avoidance groove is provided on the side of the bracket, and a limiting arm is provided in the avoidance groove. The limiting arm is arranged along the length direction of the bracket, and the side of the limiting arm close to the first end of the shell is a free end, and the inner wall of the limiting arm close to the second end of the shell is provided with a protrusion; a limiting groove matching the limiting arm is provided on the protective shell; the push rod can push the protrusion so that the free end of the limiting arm extends into the limiting groove.

6. A training pen for simulating injection according to claim 1, characterized in that: The damping outer ring and the damping inner ring form a closed damping cavity, and the damping cavity is filled with a damping medium.

7. A training pen for simulating injection according to claim 2, characterized in that: The actuating unit further includes a fixing block, the fixing sleeve is fixedly connected to the fixing block, the fixing block is fixedly connected to the housing, and the damping member abuts against the fixing block.

8. A training pen for simulating injection according to claim 7, characterized in that: A surface of the fixing block close to the damping member is provided with a dot-shaped protrusion, and the dot-shaped protrusion abuts against the damping inner ring of the damping member.

9. A training pen for simulating injection according to claim 1, characterized in that: The pen cap is also provided with a reset rod.

10. A training pen for simulating injection according to claim 4, characterized in that: The shell is also provided with a window matching the viewing window.

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