Self-driven automatic injection device

Abstract

The invention relates to the technical field of pen-type injection devices, in particular to a self-driven automatic injection device which comprises a shell, a medicine bottle support, a driving device and a control device. A needle puncture-proof protection assembly is arranged on the lower portion in the shell, the needle puncture-proof protection assembly comprises a needle hiding sleeve, and the needle puncture-proof protection assembly is configured in the mode that in the injection process or after injection is completed and the needle hiding sleeve is pulled out, the needle hiding sleeve can be locked, and then injection cannot be continued; an energy storage locking assembly is arranged on the upper portion of the interior of the shell and is configured in the mode that before injection, the driving rod is locked by the needle hiding sleeve, when one end of the needle hiding sleeve is stressed to move towards the driving rod, the driving rod is unlocked, the torsional spring provides driving force to enable the driving rod to drive the push rod to move towards the medicine bottle, and injection is achieved. Stable and reliable injection power can be provided, and injection can be rapidly achieved; in addition, the needle hiding sleeve can be locked no matter the needle hiding sleeve is pulled out during injection or after injection is completed, so that the needle hiding sleeve does not retract inwards, secondary injection is prevented, and safety and reliability are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pen-type injection devices, in particular to a self-driven automatic injection device. Background Art

[0002] Currently, disposable automatic injection pens are available on the market. They are primarily used for administering single (small) doses of medications that require injection at regular intervals (e.g., weekly). These pens store a driving force before injection and rely on a mechanical linkage to automatically deliver the injection.

[0003] Existing disposable automatic injection pens often have problems such as uncontrollable injection speed and insufficient friendly prompts. These shortcomings limit their widespread application in specific patient groups, especially users who have poor force control or are afraid of the injection process.

[0004] The present invention therefore provides a self-actuated automatic injection device. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a self-driven automatic injection device.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The present invention provides a self-driven automatic injection device, comprising:

[0008] a housing, wherein a medicine bottle holder is disposed in the housing and the medicine bottle holder accommodates the medicine bottle;

[0009] A needle puncture protection assembly is provided at the lower portion of the housing. The needle puncture protection assembly includes a hidden needle cover. The needle puncture protection assembly is configured such that: during the injection process or after the injection is completed, the hidden needle cover can be locked after being pulled out, thereby preventing further injection.

[0010] An energy storage locking assembly is provided above the interior of the shell, and the energy storage locking assembly includes a torsion spring, a drive rod and a push rod, wherein the torsion spring is provided outside the drive rod, and the push rod is provided inside the drive rod; the energy storage locking assembly is configured as follows: before injection, the drive rod is locked by the hidden needle sleeve, and when one end of the hidden needle sleeve is forced to move toward the drive rod, the drive rod is unlocked, and the torsion spring provides driving force to cause the drive rod to drive the push rod to move toward the medicine bottle, thereby achieving injection.

[0011] Furthermore, the upper end of the shell is connected to the pen cover, the upper end of the torsion spring is clamped on the pen cover, and the lower end of the torsion spring is clamped on the lower end of the driving rod; before injection, the torsion spring is in a power storage state.

[0012] Furthermore, a buckle groove is provided on the outer wall of the upper end of the shell, and a buckle is provided on the pen cover, and the buckle is snapped into the buckle groove.

[0013] Furthermore, a toothed disc is provided at the lower end of the driving rod, and the outer wall of the toothed disc is provided with a hidden needle sleeve engaging tooth; a locking pin is provided at the upper end of the hidden needle sleeve, and the inner wall of the locking pin is provided with a driving rod engaging tooth;

[0014] Before injection, the driving rod engaging teeth are engaged with the hidden needle sleeve engaging teeth;

[0015] When one end of the hidden needle sleeve is forced to move toward the driving rod, the driving rod engaging teeth are separated from the hidden needle sleeve engaging teeth.

[0016] Furthermore, a push rod engaging rib is provided on the inner wall of the driving rod, and the push rod engaging rib extends axially along the driving rod; a driving rod engaging rib groove is provided on the outer wall of the driving rod, and the push rod engaging rib is embedded in the driving rod engaging rib groove.

[0017] Furthermore, a connecting block is provided between the driving rod and the medicine bottle holder, and convex ribs are provided on the upper surface of the connecting block, and the convex ribs are distributed along the radial array of the connecting block; a downward extending shifting rod is provided on the lower surface of the driving rod, and during the rotation of the driving rod, the shifting rod continuously hits the convex ribs.

[0018] Furthermore, a limiting groove is provided on the outer wall of the connecting block, a limiting strip is provided on the inner wall of the outer shell, and the limiting strip is embedded in the limiting groove; a spiral rib is provided on the inner wall of the connecting block, a spiral tooth is provided on the outer wall of the push rod, and the spiral rib is engaged with the spiral tooth.

[0019] Furthermore, the needle puncture protection assembly further includes a locking sleeve, which is arranged above the hidden needle sleeve;

[0020] The lower surface of the locking sleeve is provided with circumferentially evenly distributed oblique teeth, and the upper surface of the hidden needle sleeve is provided with a sliding inclined surface that cooperates with the oblique teeth, and the sliding inclined surface abuts against the oblique teeth;

[0021] A sliding oblique pin is provided on the inner wall of the housing, and the sliding oblique pin is embedded in the oblique teeth;

[0022] An elastic element is sleeved on the outer wall of the locking sleeve, the upper end of the elastic element abuts against the medicine bottle holder, and the lower end of the elastic element abuts against the outer wall of the locking sleeve;

[0023] A push rod is provided on the outer wall of the medicine bottle holder, and a locking strip is provided on the upper end of the locking sleeve. In the initial state, the push rod and the locking strip are on different axes; after being pulled out, the push rod and the locking strip are on the same axis.

[0024] Furthermore, the elastic element is a compression spring.

[0025] Furthermore, a plurality of limit strips are provided on the inner wall of the shell, and the locking pin is embedded between two adjacent limit strips; and a limit surface is provided on the inner wall of the shell, and the hidden needle sleeve is clamped on the limit surface.

[0026] Furthermore, a hidden needle sleeve observation window is provided on the hidden needle sleeve, and a shell observation window is provided on the shell, and the hidden needle sleeve observation window and the shell observation window partially overlap.

[0027] Furthermore, the lower end of the shell is connected to a protective cap, and the protective cap covers the lower end of the hidden needle sleeve and is then snap-fitted to the shell.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a self-driven automatic injection device, which utilizes a torsion spring to store force. The reverse rotation of the torsion spring drives the driving rod to rotate, and the engaging connecting block restricts the push rod. The driving rod drives the push rod to move the push rod toward the medicine bottle to achieve injection. Compared with the technical solution of utilizing axial driving force in the prior art, the driving force of the present invention does not have the problem of unstable injection speed. The rotational driving force of the torsion spring can provide stable and reliable injection power, and quickly achieve injection.

[0030] The present invention utilizes a hidden needle cover to hide the needle before and after injection, which is very friendly to patients with needle phobia. In addition, the needle puncture protection component can lock the hidden needle cover whether it is pulled out during injection or after the injection, so that it no longer retracts and injection cannot be made. This design not only has the needle puncture protection function, but also prevents the possibility of secondary injection. A single dose only corresponds to one injection per patient, which is safe and reliable.

[0031] The present invention adopts a two-step injection action, which is convenient and efficient, and is very suitable for self-administration at home, reducing the patient's ability training and complex usage scenarios.

[0032] The present invention completes energy storage driving before injection, does not require the patient to apply external force, and provides stable and reliable injection power, which is more scientific and reliable for the injection effect.

[0033] In addition, during the injection process, the present invention can generate a "click-click-click" prompt sound through the cooperation of the driving rod and the connecting block, which makes the present invention have an excellent interactive and friendly design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the front view of the present invention;

[0035] Figure 2 An exploded view of the present invention;

[0036] Figure 3 is a structural diagram of the connection block;

[0037] Figure 4 is a schematic structural diagram of the driving rod;

[0038] Figure 5 Schematic diagram of the structure of the medicine bottle holder;

[0039] Figure 6 Schematic diagram of the structure of the hidden needle sleeve;

[0040] Figure 7 is a structural schematic diagram of the locking sleeve;

[0041] Figure 8 is a schematic diagram of the internal structure of the housing, with part of the outer wall of the housing cut away to show the internal structure;

[0042] Figure 9 is a schematic structural diagram of the pen cap;

[0043] Figure 10 is a structural schematic diagram of the push rod;

[0044] Figure 11 This is a diagram showing the state before excitation with the protective cap removed. In order to show the internal structure, part of the outer wall of the housing is cut away.

[0045] Figure 12 This is a cross-sectional view of the present invention before excitation with the protective cap removed;

[0046] Figure 13 This is a cross-sectional view of the hidden needle sleeve of the present invention after being retracted and activated;

[0047] Figure 14 This is a diagram showing the connection between the hidden needle sleeve and the locking sleeve before the hidden needle sleeve is activated. In order to show the internal structure, the outer shell is hidden;

[0048] Figure 15 This is a diagram showing the connection between the hidden needle sleeve and the locking sleeve after the hidden needle sleeve is activated. In order to show the internal structure, the outer shell is hidden;

[0049] Figure 16 This is a schematic diagram of the structure of the sound and tactile feedback portion of the present invention;

[0050] Figure 17 This is a schematic diagram of the internal structure of the hidden needle sheath after the retraction-reset cycle of the present invention. In order to show the internal structure, part of the outer wall of the shell is cut away;

[0051] Reference numerals:

[0052] 1. Protective cap, 2. Hidden needle sleeve, 201. Locking pin, 202. Drive rod engaging teeth, 203. Sliding ramp,

[0053] 3. Locking sleeve, 301, helical teeth, 302, locking strip,

[0054] 4. Compression spring, 5. Medicine bottle holder, 501. Ejector rod,

[0055] 6. Connecting block, 601, convex rib, 602, limiting groove, 603, spiral rib,

[0056] 7. Push rod, 701, driving rod engaging rib groove, 702, spiral teeth,

[0057] 8. Driving rod, 801, hidden needle sleeve engaging teeth, 802, push rod engaging rib, 803, shift lever, 804, fixing slot under torsion spring,

[0058] 9. Torsion spring, 10. Pen cap, 1001. Buckle, 1002. Fixed slot on torsion spring,

[0059] 11. Shell, 1101. Buckle slot, 1102. Limiting strip, 1103. Limiting surface, 1104. Sliding oblique pin, 1105. Bottle holder limiting strip,

[0060] 12. Medicine bottle. DETAILED DESCRIPTION

[0061] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0062] It should be noted that, unless otherwise specifically stated, the relative arrangements of components and steps, and numerical expressions set forth in these embodiments should not be construed as limiting the scope of the present invention.

[0063] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention, its application, or use in any sense. Technologies, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but to the extent applicable, such technologies, methods, and apparatuses should be considered part of this specification.

[0064] This embodiment provides a self-driven automatic injection device, such as Figure 1 and Figure 2As shown, it includes a protective cap 1, a hidden needle sleeve 2, a locking sleeve 3, a compression spring 4, a medicine bottle bracket 5, a connecting block 6, a push rod 7, a driving rod 8, a torsion spring 9, a pen cover 10, a shell 11, and a medicine bottle 12; the upper end of the shell 11 is connected to the pen cover 10, and the lower end of the shell 11 is connected to the protective cap 1. The shell 11, the pen cover 10, and the protective cap 1 form a closed space, and other components are arranged in the closed space.

[0065] A medicine bottle holder 5 is provided in the housing 11, and the medicine bottle holder 5 accommodates a medicine bottle 12;

[0066] A needle puncture protection assembly is provided below the interior of the housing 11. The needle puncture protection assembly includes a hidden needle cover 2, a locking cover 3, and a compression spring 4. The needle puncture protection assembly is configured such that during the injection process or after the injection is completed, the hidden needle cover 2 can be locked, thereby preventing further injection.

[0067] An energy storage locking assembly is provided above the interior of the housing 11, and the energy storage locking assembly includes a torsion spring 9, a drive rod 8 and a push rod 7. The torsion spring 9 is provided outside the drive rod 8, and the push rod 7 is provided inside the drive rod 8. The energy storage locking assembly is configured as follows: before injection, the drive rod 8 is locked by the hidden needle sleeve 2; when one end of the hidden needle sleeve 2 is forced to move toward the drive rod 8, the drive rod 8 is unlocked, and the torsion spring 9 provides driving force so that the drive rod 8 drives the push rod 7 to move toward the medicine bottle 12, thereby achieving injection.

[0068] A connecting block 6 is provided between the driving rod 8 and the medicine bottle holder 5, and a convex rib 601 is provided on the upper surface of the connecting block 6, and the convex rib 601 is distributed in a radial array along the connecting block 6; a downward extending shift rod 803 is provided on the lower surface of the driving rod 8, and during the rotation of the driving rod 8, the shift rod 803 continuously hits the convex rib 601.

[0069] like Figure 3 The figure shows a schematic structural diagram of the connecting block 6. The upper surface of the connecting block 6 is stuck inside the driving rod 8, thereby limiting the upper position of the connecting block 6, and the upper surface of the driving rod 8 is stuck inside the pen cap 10, thereby limiting the upper position of the driving rod 8.

[0070] A limiting groove 602 is provided on the outer wall of the connecting block 6 for matching with the limiting strip 1102 on the outer shell 11. The limiting strip 1102 is embedded in the limiting groove 602 to realize the circumferential limitation of the connecting block 6; a spiral rib 603 is provided on the inner wall of the connecting block 6, and a spiral tooth 702 is provided on the outer wall of the push rod 7. The spiral rib 603 is engaged with the spiral tooth 702, and then when the push rod 7 rotates, the push rod 7 is restricted by the connecting block 6, which prompts the axial displacement of the push rod to realize injection.

[0071] In addition, the rib 601 provided on the upper surface of the connecting block 6 is matched with the lever 803 provided on the lower surface of the driving rod 8. During the injection process, the lever 803 continuously elastically deforms and resets, hitting the rib 601, thereby generating a "click-click" sound prompt and vibration feedback on the injection grip shell, which can effectively remind the user of the injection status.

[0072] like Figure 4 The figure shows the structure of the driving rod 8. A toothed disc is provided at the lower end of the driving rod 8. The outer wall of the toothed disc is provided with a cover engagement tooth 801, which cooperates with the driving rod engagement tooth 202 provided on the inner wall of the locking pin 201 of the cover 2.

[0073] Before injection, the drive rod engagement teeth 202 are engaged with the hidden needle sleeve engagement teeth 801. Since the hidden needle sleeve 2 is restricted by the housing 11 and cannot rotate, the drive rod 8 is locked and cannot rotate.

[0074] When one end of the hidden needle sleeve 2 is forced to move toward the driving rod 8 (i.e., when the injection is triggered), the driving rod engaging teeth 202 are separated from the hidden needle sleeve engaging teeth 801. At this time, the driving rod 8 is freed from the restriction of the hidden needle sleeve 2, and the driving rod 8 can rotate under the drive of the torsion spring 9 to realize the subsequent injection action.

[0075] The inner wall of the driving rod 8 is provided with a push rod engaging rib 802, which extends axially along the driving rod 8; the outer wall of the pushing rod 7 is provided with a driving rod engaging rib groove 701, and the pushing rod engaging rib 802 is embedded in the driving rod engaging rib groove 701.

[0076] In addition, a torsion spring lower fixing slot 804 is provided on the gear disc of the driving rod 8 , and the lower end of the torsion spring 9 is clamped into the torsion spring lower fixing slot 804 .

[0077] like Figure 5 The diagram shows the structure of the medicine bottle holder 5. The medicine bottle holder 5 is disposed within a housing 11, which is provided with a medicine bottle holder retaining bar 1105. The lower surface of the upper outer wall of the medicine bottle holder 5 contacts the upper surface of the medicine bottle holder retaining bar 1105, thereby limiting the lower position of the medicine bottle holder 5. A connecting block 6 is provided above the medicine bottle holder 5, and the lower surface of the connecting block 6 limits the upper position of the medicine bottle holder 5.

[0078] In addition, a limiting groove is provided on the outer wall of the medicine bottle holder 5 for limiting its radial rotation. Specifically, two adjacent limiting bars 1102 are provided on the outer shell 11 and are embedded in the same limiting groove, thereby preventing the medicine bottle holder 5 from rotating relative to the outer shell 11. Combined with the upper and lower limits of the medicine bottle holder 5, the medicine bottle holder 5 does not move during the entire use process.

[0079] A push rod 501 is provided on the outer wall of the medicine bottle holder 5 for locking the locking sleeve 3 . Specifically, two push rods 501 are symmetrically provided on the outer wall of the medicine bottle holder 5 .

[0080] like Figure 6 The structure diagram of the hidden needle sleeve 2 is shown. The upper surface of the hidden needle sleeve 2 is provided with a sliding inclined surface 203 and a locking pin 201. The sliding inclined surface 203 cooperates with the oblique teeth 301 of the locking sleeve 3, and the locking pin 201 cooperates with the drive rod 8. Specifically:

[0081] Combine Figure 7 The lower surface of the locking sleeve 3 is provided with circumferentially evenly distributed oblique teeth 301, and the upper surface of the hidden needle sleeve 2 is provided with a sliding inclined surface 203 that cooperates with the oblique teeth 301, and the sliding inclined surface 203 abuts against the oblique teeth 301;

[0082] A drive rod engaging tooth 202 is provided on the inner wall of the locking pin 201, and the drive rod engaging tooth 202 engages and disengages with the hidden needle sleeve engaging tooth 801, so that the drive rod 8 is locked and cannot be injected before injection, and the drive rod 8 is released to achieve the injection after the hidden needle sleeve 2 is stimulated.

[0083] In addition, a hidden needle sleeve observation window is provided on the hidden needle sleeve 2, and a shell observation window is provided on the shell 11. The hidden needle sleeve observation window and the shell observation window partially overlap, so as to facilitate observation of the injection process.

[0084] like Figure 7 : is a structural diagram of the locking sleeve 3, which is arranged above the hidden needle sleeve 2 and is sleeved on the outside of the medicine bottle holder 5; the lower surface of the locking sleeve 3 is provided with circumferentially evenly distributed oblique teeth 301, and the upper surface of the hidden needle sleeve 2 is provided with a sliding inclined surface 203 that cooperates with the oblique teeth 301, and the sliding inclined surface 203 abuts against the oblique teeth 301;

[0085] A sliding oblique pin 1104 is provided on the inner wall of the housing 11. When the hidden needle sleeve 2 is not activated (initial state and reset state), the sliding oblique pin 1104 is embedded in the oblique tooth 301.

[0086] A compression spring 4 is sleeved on the outer wall of the locking sleeve 3, the upper end of the compression spring 4 abuts against the medicine bottle holder 5, and the lower end of the compression spring 4 abuts against the outer wall of the locking sleeve 3, so as to reset the locking sleeve 3;

[0087] Regarding the locking strip 302 provided at the upper end of the locking sleeve 3 , in an initial state, the push rod 501 and the locking strip 302 are located on different axes; after being pulled out, the push rod 501 and the locking strip 302 are located on the same axis.

[0088] like Figure 8This is a structural diagram of the shell 11. Four limit bars 1102 are arranged on the inner wall of the shell 11. The four limit bars 1102 are grouped in twos, and the two groups are symmetrically arranged. Each group of limit bars 1102 corresponds to a locking pin 201, and a locking pin 201 is arranged between the two limit bars 1102; and the two limit bars 1102 in the same group are embedded in the limit groove 602 of the connecting block 6 and the limit groove of the medicine bottle holder 5, for limiting the connecting block 6 and the medicine bottle holder 5.

[0089] A plurality of medicine bottle holder limiting strips 1105 are also provided on the inner wall of the shell 11 , and the plurality of medicine bottle holder limiting strips 1105 are in contact with the lower surface of the upper outer wall of the medicine bottle holder 5 , thereby limiting the lower position of the medicine bottle holder 5 .

[0090] A plurality of oblique sliding pins 1104 are further provided on the inner wall of the housing 11 , and the oblique sliding pins 1104 are used to put the locking sleeve 3 into a temporary locking state.

[0091] A limiting surface 1103 is further provided on the inner wall of the shell 11 , and the upper end of the hidden needle sleeve 2 is clamped on the limiting surface 1103 , thereby limiting the lower position of the hidden needle sleeve 2 .

[0092] In addition, a snap groove 1101 for fixing the pen cover 10 is also provided on the inner wall of the shell 11 .

[0093] like Figure 9 The figure shows the structure of the pen cap 10. A buckle 1001 is provided at the bottom of the pen cap 10. The buckle 1001 is inserted into the buckle groove 1101 to connect the pen cap 10 and the housing 11. In addition, a torsion spring fixing groove 1002 is provided inside the pen cap 10 for clamping the upper end of the torsion spring 9.

[0094] like Figure 10 This is a structural diagram of the push rod 7. The outer wall of the push rod 7 is provided with an axial drive rod engaging rib groove 701 for engaging with the push rod engaging rib 802 on the inner wall of the drive rod 8; the outer wall of the push rod 7 is also provided with a spiral tooth 702, which engages with the spiral rib 603 on the inner wall of the connecting block 6.

[0095] like Figure 11 and Figure 12 The figure shows the initial state of the injection device before it is activated. During the production and assembly of the injection device, the torsion spring 9 is twisted and loaded for installation in order to provide a stable driving force for the subsequent injection process. Figure 12 It can be seen that in the initial state, the hidden needle sleeve engaging teeth 801 of the driving rod 8 are engaged with the driving rod engaging teeth 202 of the hidden needle sleeve 2, and the hidden needle sleeve 2 is restricted by the housing 11 in the limiting strip 1102 and cannot rotate. Then, the driving rod 8 is restricted by the hidden needle sleeve 2 and cannot rotate, that is, the driving rod 8 is in a limit locking state.

[0096] At the same time, in the initial state, Figure 14 As shown, the beveled teeth 301 of the locking sleeve 3 abut against the inclined sliding surface 203 of the hidden needle sleeve 2. However, the abutment between the beveled teeth 301 and the inclined sliding surface 203 alone is unstable. Therefore, the inclined sliding pin 1104 on the inner wall of the housing 11 engages with the beveled teeth 301, locking the locking sleeve 3. Similarly, in the initial state, the locking bar 302 of the locking sleeve 3 and the push rod 501 are not coaxially aligned. That is, the push rod 501 cannot prevent the upward movement of the locking sleeve 3.

[0097] When the hidden needle cover 2 contacts the skin and the injection pen is pressed, the hidden needle cover 2 is retracted. Figure 13 As shown, the upward movement of the hidden needle sleeve 2 causes the drive rod engagement teeth 202 on the inner wall of the locking pin 201 to disengage from the hidden needle sleeve engagement teeth 801, thereby releasing the drive rod 8 from its restraint position and entering a released state. When the torsion spring 9 returns counterclockwise, the torsion spring 9 drives the drive rod 8 to rotate counterclockwise, which in turn drives the push rod 7 to rotate counterclockwise. The helical teeth 702 of the push rod 7 engage with the helical ribs 603 on the inner wall of the connecting block 6. The connecting block 6 is restrained by the housing 11 and cannot rotate. Consequently, as the push rod 7 rotates, it moves axially toward the vial 12, pushing the piston in the vial 12 to effect injection.

[0098] At the same time, if Figure 15 As shown, after the hidden needle sleeve 2 is activated, the hidden needle sleeve 2 moves upward, and the hidden needle sleeve 2 drives the locking sleeve 3 to move upward. When the bevel teeth 301 of the locking sleeve 3 are separated from the sliding bevel pin 1104 on the inner wall of the shell 11, the locking sleeve 3 is separated from the limit of the shell 11. In addition, the abutment between the bevel teeth 301 and the sliding bevel 203 is in an unstable state. Therefore, the locking sleeve 3 rotates clockwise by a certain angle, prompting the bevel teeth 301 and the sliding bevel 203 to switch to a stable abutment state.

[0099] When the injection device is pulled out after the injection is completed, or when the injection device is pulled out during the injection process, the hidden needle sleeve 2 and the locking sleeve 3 move downward under the elastic force of the compression spring 4, and the hidden needle sleeve 2 moves downward until it is limited by the limiting surface 1103 on the inner wall of the shell 11, and after the locking sleeve 3 contacts the sliding oblique pin 1104, it continues to rotate a certain angle until the sliding oblique pin 1104 is inserted into the oblique tooth 301, so that the connection state between the sliding oblique pin 1104 and the oblique tooth 301 is restored to the initial state. Figure 17 shown.

[0100] exist Figure 17 In the state shown, the locking bar 302 and the push rod 501 are on the same axis. At this time, if the hidden needle cover 2 is further activated, that is, the hidden needle cover 2 is squeezed upward, the hidden needle cover 2 can only move within a very small range due to the obstruction of the push rod 501 on the locking cover 3, and the needle tip cannot be exposed, and further injection action cannot be completed, thereby realizing the needle puncture protection function.

[0101] In addition, during the injection process, Figure 16 As shown, the lever 803 below the driving rod 8 is always in contact with the rib 601 on the connecting block 6, and during the continuous elastic deformation and resetting process, it hits the rib 601, generating a "click-click" injection sound and vibration feedback on the injection grip shell, which can effectively remind the user of the injection status.

[0102] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A self-propelled automatic injection device comprising: a housing, wherein a medicine bottle holder is disposed in the housing and the medicine bottle holder accommodates the medicine bottle; The invention is characterized in that a needle puncture protection component is provided below the interior of the shell, and the needle puncture protection component includes a hidden needle cover, and the needle puncture protection component is configured so that: during the injection process or after the injection is completed, the hidden needle cover can be locked after being pulled out, thereby preventing further injection; An energy storage locking assembly is provided above the interior of the shell, and the energy storage locking assembly includes a torsion spring, a drive rod and a push rod, wherein the torsion spring is provided outside the drive rod, and the push rod is provided inside the drive rod; the energy storage locking assembly is configured as follows: before injection, the drive rod is locked by the hidden needle sleeve, and when one end of the hidden needle sleeve is forced to move toward the drive rod, the drive rod is unlocked, and the torsion spring provides driving force to cause the drive rod to drive the push rod to move toward the medicine bottle, thereby achieving injection.

2. The self-propelled automatic injection device according to claim 1, characterized in that: The upper end of the shell is connected to the pen cover, the upper end of the torsion spring is clamped on the pen cover, and the lower end of the torsion spring is clamped on the lower end of the driving rod; before injection, the torsion spring is in a power storage state.

3. The self-propelled automatic injection device according to claim 1, characterized in that: A toothed disc is provided at the lower end of the driving rod, and the outer wall of the toothed disc is provided with engaging teeth for the hidden needle sleeve; a locking pin is provided at the upper end of the hidden needle sleeve, and the inner wall of the locking pin is provided with engaging teeth for the driving rod; Before injection, the driving rod engaging teeth are engaged with the hidden needle sleeve engaging teeth; When one end of the hidden needle sleeve is forced to move toward the driving rod, the driving rod engaging teeth are separated from the hidden needle sleeve engaging teeth.

4. The self-propelled automatic injection device according to claim 3, characterized in that: The inner wall of the driving rod is provided with a push rod engaging rib, which extends axially along the driving rod; the outer wall of the pushing rod is provided with a driving rod engaging rib groove, and the pushing rod engaging rib is embedded in the driving rod engaging rib groove.

5. The self-propelled automatic injection device according to claim 1, characterized in that: A connecting block is provided between the driving rod and the medicine bottle holder, and convex ribs are provided on the upper surface of the connecting block, and the convex ribs are distributed along the radial array of the connecting block; a downward extending shifting rod is provided on the lower surface of the driving rod, and during the rotation of the driving rod, the shifting rod continuously hits the convex ribs.

6. The self-propelled automatic injection device according to claim 5, characterized in that: A limiting groove is provided on the outer wall of the connecting block, a limiting strip is provided on the inner wall of the shell, and the limiting strip is embedded in the limiting groove; a spiral rib is provided on the inner wall of the connecting block, and a spiral tooth is provided on the outer wall of the push rod, and the spiral rib is engaged with the spiral tooth.

7. The self-actuated automatic injection device according to claim 1, wherein: The needle puncture protection assembly further includes a locking sleeve, which is arranged above the hidden needle sleeve; The lower surface of the locking sleeve is provided with circumferentially evenly distributed oblique teeth, and the upper surface of the hidden needle sleeve is provided with a sliding inclined surface that cooperates with the oblique teeth, and the sliding inclined surface abuts against the oblique teeth; A sliding oblique pin is provided on the inner wall of the housing, and the sliding oblique pin is embedded in the oblique teeth; An elastic element is sleeved on the outer wall of the locking sleeve, the upper end of the elastic element abuts against the medicine bottle holder, and the lower end of the elastic element abuts against the outer wall of the locking sleeve; A push rod is provided on the outer wall of the medicine bottle holder, and a locking strip is provided on the upper end of the locking sleeve. In the initial state, the push rod and the locking strip are on different axes; after being pulled out, the push rod and the locking strip are on the same axis.

8. The self-propelled automatic injection device according to claim 3, characterized in that: A plurality of limit strips are provided on the inner wall of the shell, and the locking pin is embedded between two adjacent limit strips; and a limit surface is provided on the inner wall of the shell, and the hidden needle sleeve is clamped on the limit surface.

9. The self-actuated automatic injection device according to claim 1, wherein: A hidden needle sleeve observation window is provided on the hidden needle sleeve, and a shell observation window is provided on the shell, and the hidden needle sleeve observation window and the shell observation window partially overlap.

10. The self-actuated automatic injection device according to claim 1, wherein: The lower end of the shell is connected to a protective cap, and the protective cap covers the lower end of the hidden needle sleeve and is then clamped with the shell.

Images