Injection device

Abstract

The present invention discloses an injection device, comprising: a housing; a scale ring spirally raised and lowered relative to the housing; an injection button for applying an axial injection thrust, the lower end of the injection button being connected to the upper end of the scale ring; a push rod for pushing the piston of the medicine bottle to move; a transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component comprises a slewing ring, a driving sleeve and a push rod sleeve; the slewing ring is linked with the injection button in the circumferential direction; the end face of the driving sleeve opposite to the slewing ring is provided with a first end face gear ring, the lower end face of the slewing ring is provided with a second end face gear ring matched with the first end face gear ring, the driving sleeve is linked with the push rod in the circumferential direction; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread. The injection device of the present invention can better control the injection dose.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and in particular to an injection device. Background Art

[0002] For diabetic patients, their blood sugar index is very important and needs to be paid attention to and recorded regularly. In order to reduce the fluctuation of patients' blood sugar index, it needs to be controlled by drugs. Artificial insulin is a well-known drug for lowering blood sugar index. It must be administered parenterally to work in the human body. At present, the most common way to administer artificial insulin to diabetic patients is through subcutaneous injection; subcutaneous injections mostly use disposable or fixed-dose syringes, but because the dose required by the patient depends on his blood sugar index, there are many inconveniences in use.

[0003] Although there are also injection devices on the market that can adjust the dosage, there is a problem that the dosage control is not precise enough. Summary of the invention

[0004] In view of this, an embodiment of the present invention is intended to provide an injection device that can better control the injection dose.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present invention is implemented as follows:

[0006] An embodiment of the present invention provides an injection device, the injection device comprising:

[0007] A housing; one end of the housing is an injection end connected to the medicine bottle, and the other end is an adjustment end for adjusting the dosage;

[0008] A graduated ring that is spirally raised and lowered relative to the housing; the graduated ring is located at the adjustment end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures;

[0009] An injection button for applying an axial injection thrust; the injection button is located at the adjustment end of the housing, and the lower end of the injection button is connected to the upper end of the scale ring; the scale ring spirally descends along a first circumferential direction with the axial injection thrust of the injection button, and the injection button spirally descends with the spiral descent of the scale ring;

[0010] A push rod for pushing the piston of the medicine bottle to move; the push rod is located in the housing and extends along the axial direction of the housing; the push rod comprises a pushing end connected to the medicine bottle and a force-bearing end connected to the injection button, and the pushing end of the push rod extends out of the injection end of the housing;

[0011] A transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component includes a slewing ring, a drive sleeve and a push rod sleeve;

[0012] The slewing ring is located below the injection button, and the slewing ring is linked with the injection button in the circumferential direction;

[0013] The drive sleeve is located below the slewing ring, and a first end face gear ring is provided on an end face of the drive sleeve opposite to the slewing ring. The first end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. A second end face gear ring that cooperates with the first end face gear ring is provided on the lower end face of the slewing ring. The drive sleeve rotates with the rotation of the slewing ring in the first circumferential direction. The drive sleeve is sleeved on the push rod, and the drive sleeve is linked with the push rod in the circumferential direction.

[0014] The push rod sleeve is located below the drive sleeve and is fixed in position; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.

[0015] In the above scheme, a third end face gear ring is provided at the upper end of the scale ring, and the third end face gear ring is a unidirectional end face gear ring that only transmits torque in the second circumferential direction and has a triangular tooth shape. A fourth end face gear ring that cooperates with the third end face gear ring is provided at the lower end of the injection button; when the scale ring rotates along the second circumferential direction, the injection button rotates with the rotation of the scale ring.

[0016] In the above scheme, the slewing ring includes a first slewing ring, a second slewing ring and a third slewing ring, which are nested in sequence in the axial direction and can be retracted and contracted with each other in the axial direction, and are linked in the circumferential direction; the lower end face of the first slewing ring is provided with the second end face gear ring, and the upper end of the third slewing ring is connected to the lower end of the injection button; the first elastic part and the second elastic part that increase the total axial length are provided between the first slewing ring, the second slewing ring and the third slewing ring.

[0017] In the above scheme, the injection button includes a pressing cap and an injection force transmission sleeve which are connected to each other, and the injection force transmission sleeve and the pressing cap can rotate relative to each other; the lower end of the injection force transmission sleeve is provided with the fourth end face gear ring, and the injection force transmission sleeve is connected to the upper end of the third rotating ring.

[0018] In the above scheme, the shell includes an outer cylinder and an inner cylinder fixed to each other, the outer cylinder and the inner cylinder are radially spaced apart by a preset gap, and the scale ring is rotatably arranged between the outer cylinder and the inner cylinder; the inner wall of the scale ring is provided with a second internal thread, and the outer circle of the inner cylinder is provided with a second external thread matching the second internal thread; the outer cylinder is provided with a reading window corresponding to the scale ring.

[0019] In the above scheme, the injection device also includes a support sleeve supporting the transmission component, the support sleeve is arranged on the push rod and is located between the drive sleeve and the push rod sleeve; the upper end face of the support sleeve is provided with a fifth end face gear ring, the fifth end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits the torque in the second circumferential direction, and the lower end face of the drive sleeve is provided with a sixth end face gear ring that cooperates with the fifth end face gear ring; the support sleeve is fixed to the shell.

[0020] In the above solution, the injection device further comprises a push rod head, the push rod head is connected to the pushing end of the push rod, and the push rod head and the push rod can rotate relative to each other.

[0021] In the above scheme, the injection device also includes a third elastic part for fixing the axial position of the medicine bottle, one end of the third elastic part abuts against the support sleeve, and the other end abuts against the push rod sleeve, and pushes the push rod sleeve to axially press the medicine bottle.

[0022] In the above scheme, an upper cover is fixed to the upper end of the scale ring, and the upper cover is above the injection force transmission sleeve; a connecting shaft is fixed to the bottom of the pressing cap, and the connecting shaft passes through the upper cover and is connected to the injection force transmission sleeve; the injection device also includes a fourth elastic part that maintains the meshing of the third end face gear ring and the fourth end face gear ring, one end of the fourth elastic part abuts against the upper end of the injection force transmission sleeve, and the other end abuts against the bottom end of the upper cover.

[0023] In the above scheme, the injection device also includes a limit sleeve for limiting the circumferential position of the push rod sleeve, and the limit sleeve is fixed to the injection end of the shell; the limit sleeve is arranged on the lower end of the push rod sleeve, and the inner wall of the limit sleeve is provided with axially extending ribs, and the outer wall of one end of the push rod sleeve is provided with an axial groove corresponding to the rib.

[0024] The injection device of the embodiment of the present invention comprises: a housing; a scale ring spirally raised and lowered relative to the housing; an injection button for applying an axial injection thrust, wherein the lower end of the injection button is connected to the upper end of the scale ring; a push rod for pushing the piston of the medicine bottle to move; a transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component comprises a slewing ring, a driving sleeve and a push rod sleeve; the slewing ring is linked with the injection button in the circumferential direction; the end face of the driving sleeve opposite to the slewing ring is provided with a first end face gear ring, the lower end face of the slewing ring is provided with a second end face gear ring matched with the first end face gear ring, and the driving sleeve is linked with the push rod in the circumferential direction; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread; it can be seen that the injection device of the embodiment of the present invention transmits torque through the end face gear ring with a triangular tooth shape, can accurately transmit torque, and can better control the injection dose.

[0025] Other beneficial effects of the embodiments of the present invention will be further described in the specific implementation manner in conjunction with the specific technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. It should be understood that the drawings described below are only part of the drawings of the embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of an injection device provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A three-dimensional schematic diagram of

[0029] Figure 3 for Figure 1 Cross-sectional view of Figure 1 (initial state);

[0030] Figure 4 for Figure 1 Cross-sectional view of Figure 2 (adjust scale status);

[0031] Figure 5 for Figure 1 Cross-sectional view of Figure 3 (Injection completed status);

[0032] Figure 6 for Figure 3 Schematic diagram of removing the protective cap, medicine chamber and medicine bottle;

[0033] Figure 7 A schematic diagram of the push rod, the support sleeve, the drive sleeve, the slewing ring and the injection force transmission sleeve in the injection device provided by the embodiment of the present invention being assembled together;

[0034] Figure 8 A schematic diagram of a scale ring in an injection device provided in an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of a pressing cap in an injection device provided in an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of an injection force transmission sleeve in an injection device provided in an embodiment of the present invention;

[0037] Fig.11 A schematic diagram of an outer barrel in an injection device provided in an embodiment of the present invention;

[0038] Fig.12 A schematic diagram of an inner cylinder in an injection device provided in an embodiment of the present invention;

[0039] Fig.13 A schematic diagram of a push rod sleeve in an injection device provided by an embodiment of the present invention;

[0040] Fig.14 A schematic diagram of a medicine chamber in an injection device provided in an embodiment of the present invention;

[0041] Fig.15 A schematic diagram of a medicine bottle in an injection device provided by an embodiment of the present invention;

[0042] Fig.16 A schematic diagram of a protective cap in an injection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] An embodiment of the present invention provides an injection device, the injection device comprising:

[0044] A housing; one end of the housing is an injection end connected to the medicine bottle, and the other end is an adjustment end for adjusting the dosage;

[0045] A graduated ring that is spirally raised and lowered relative to the housing; the graduated ring is located at the adjustment end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures;

[0046] An injection button for applying an axial injection thrust; the injection button is located at the adjustment end of the housing, and the lower end of the injection button is connected to the upper end of the scale ring; the scale ring spirally descends along a first circumferential direction with the axial injection thrust of the injection button, and the injection button spirally descends with the spiral descent of the scale ring;

[0047] A push rod for pushing the piston of the medicine bottle to move; the push rod is located in the housing and extends along the axial direction of the housing; the push rod comprises a pushing end connected to the medicine bottle and a force-bearing end connected to the injection button, and the pushing end of the push rod extends out of the injection end of the housing;

[0048] A transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component includes a slewing ring, a drive sleeve and a push rod sleeve;

[0049] The slewing ring is located below the injection button, and the slewing ring is linked with the injection button in the circumferential direction;

[0050] The drive sleeve is located below the slewing ring, and a first end face gear ring is provided on an end face of the drive sleeve opposite to the slewing ring. The first end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. A second end face gear ring that cooperates with the first end face gear ring is provided on the lower end face of the slewing ring. The drive sleeve rotates with the rotation of the slewing ring in the first circumferential direction. The drive sleeve is sleeved on the push rod, and the drive sleeve is linked with the push rod in the circumferential direction.

[0051] The push rod sleeve is located below the drive sleeve and is fixed in position; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.

[0052] Here, the medicine bottle refers to a bottle loaded with liquid medicine, which is generally fixed in the injection device through a medicine chamber, and a piston connected to a push rod is provided at one end of the medicine bottle facing the injection device, and a needle can be connected to the other end.

[0053] Here, the circumferential direction linkage means that when one side rotates, the other side must rotate, and the circumferential direction linkage in the embodiments of the present invention are all coaxial, so the rotation directions are also consistent.

[0054] Here, the tooth profiles of the first end face gear ring and the second end face gear ring are triangular, which has the advantage of higher precision, because the tooth profiles of the triangular teeth are all straight lines, which are easier to ensure processing accuracy than the usual involute tooth profiles, and therefore it is easier to ensure the accuracy of transmitted motion.

[0055] However, the meshing motion between the first end face gear ring and the second end face gear ring in the embodiment of the present invention is low-speed motion, so there is no need to adopt an involute tooth shape or other tooth shape with high transmission efficiency and stable force.

[0056] The injection device of the embodiment of the present invention transmits torque through the end face gear ring with a triangular tooth shape, which can accurately transmit torque and better control the injection dose.

[0057] The working process of the embodiment of the present invention includes installing the medicine bottle, adjusting the dosage, injecting and resetting. The specific working principle is as follows:

[0058] 1) Install the medicine bottle. The medicine bottle can be split, that is, the medicine chamber must be installed first, and then the medicine bottle is installed. After the injection, the medicine bottle is discarded, and the medicine chamber can be reused repeatedly; it can also be integrated, that is, the medicine chamber and the medicine bottle are integrated, which can be directly installed and directly discarded after the injection. It is disposable.

[0059] 2) To adjust the dose, turn the scale ring, which spirals up relative to the shell, that is, the lower end of the scale ring increases in axial distance from the shell during the rising process. The increased distance determines the moving distance of the push end of the subsequent push rod, which also determines the dose. By setting evenly distributed scales on the outer wall of the scale ring or the outer wall of the shell, the set value of the dose can be observed. Before the scale ring is adjusted for the dose, the scale ring can only rise, not fall, and at this time, the scale displays "0".

[0060] 3) Injection: Press the injection button. Since the injection button is connected to the scale ring, it will apply an axial thrust to the scale ring. The scale ring spirally descends along the first circumferential direction with the axial injection thrust of the injection button. Also, since the injection button is connected to the scale ring, the injection button spirally descends with the spiral descent of the scale ring.

[0061] Since the slewing ring is linked to the injection button in the circumferential direction, the slewing ring will rotate. The slewing ring drives the drive sleeve to rotate through the first end face gear ring and the second end face gear ring. The drive sleeve is linked to the push rod in the circumferential direction, and the push rod also rotates. Since the push rod and the push rod sleeve are connected by the first internal thread and the first external thread, and the axial position of the push rod sleeve is fixed, the push rod will spirally descend during rotation and move toward the injection end of the housing, that is, squeeze the piston of the medicine bottle to complete the injection.

[0062] Note: In order to ensure that most medicine bottles on the market can be injected, the plunger needs to be designed to be long enough.

[0063] 4) Reset, after the medicine in the medicine bottle is injected, the medicine chamber is disassembled. Axial force is applied from the pushing end of the push rod to push the push rod upward. Since the push rod and the push rod sleeve are connected through the first internal thread and the first external thread, the push rod will spirally rise until it returns to the initial position.

[0064] Note: If the medicine in the medicine bottle has not been completely injected, the medicine chamber cannot be disassembled and the axial position of the push rod cannot be retracted, otherwise it will affect the accuracy of the dosage.

[0065] The embodiments of the present invention are mainly used for injecting liquid medicines into diabetic patients or other patients, but those skilled in the art will understand that it can also be used for injecting or pushing other liquid or fluid products, which will not be elaborated here.

[0066] In some other embodiments of the present invention, the upper end of the scale ring may be provided with a third end face gear ring, and the third end face gear ring is a unidirectional end face gear ring that only transmits torque in the second circumferential direction and has a triangular tooth shape, and the lower end of the injection button is provided with a fourth end face gear ring that cooperates with the third end face gear ring; when the scale ring rotates along the second circumferential direction, the injection button rotates with the rotation of the scale ring.

[0067] In this way, when adjusting the dosage, the scale ring rotates along the second circumferential direction, and the injection button is driven to rotate through the third end face gear ring and the fourth end face gear ring. The injection button rotates, driving the rotating ring to rotate. Since the first end face gear ring is a unidirectional end face gear ring that only transmits torque in the first circumferential direction, the first end face gear ring will not rotate when the rotating ring rotates in the second circumferential direction, and the rotation of the second end face gear ring will produce circumferential sliding with the first end face gear ring, similar to a ratchet. In this way, a click and click friction sound will be generated, which is convenient for the user to perceive the adjustment of the dosage, which is a better implementation method. It can be understood that it is also possible not to provide the third end face gear ring and the fourth end face gear ring. In this way, when adjusting the dosage, only the scale ring rotates, and the others do not rotate. In addition to the user not being able to hear the click sound, it does not affect the use.

[0068] In some other embodiments of the present invention, the slewing ring may include a first slewing ring, a second slewing ring and a third slewing ring, which are nested in sequence in the axial direction and can be retracted and contracted with each other in the axial direction, and are linked in the circumferential direction; the lower end face of the first slewing ring is provided with the second end face gear ring, and the upper end of the third slewing ring is connected to the lower end of the injection button; a first elastic part and a second elastic part are provided between the first slewing ring, the second slewing ring and the third slewing ring to increase the total axial length.

[0069] Here, by designing three rotating rings to be axially nested and mutually telescopic, similar to a telescopic tube, a sufficient total length can be ensured when adjusting the dosage, so that the rotating ring always contacts the injection button, and the total length can be reduced during injection to ensure that the scale ring and the injection button descend in sequence, which is a better implementation. It can be understood that only one rotating ring is also possible, as long as a structure is designed so that the rotating ring always contacts the injection button, for example, a long key with a long axial length is provided at the bottom of the injection button, and a key slot is provided on the outer wall of the rotating ring for the long key to extend into. When adjusting the dosage, the long key can move axially in the key slot, but does not leave the key slot, and the long key and the key slot can also make the rotating ring and the injection button linked in the circumferential direction.

[0070] In some other embodiments of the present invention, the injection button may include a push cap and an injection force transmission sleeve that are connected to each other, and the injection force transmission sleeve and the push cap can rotate relative to each other; the lower end of the injection force transmission sleeve is provided with the fourth end face gear ring, and the injection force transmission sleeve is connected to the upper end of the third rotating ring. In this way, when the scale ring drives the injection button to rotate, the push cap may not rotate, which is convenient for the user to apply axial force, and is a better implementation method. Of course, there are many ways to prevent the push cap from rotating, which will not be described in detail.

[0071] In some other embodiments of the present invention, the housing may include an outer cylinder and an inner cylinder fixed to each other, the outer cylinder and the inner cylinder are radially spaced apart by a preset gap, the scale ring is rotatably arranged between the outer cylinder and the inner cylinder; the inner wall of the scale ring is provided with a second internal thread, the outer circle of the inner cylinder is provided with a second external thread matching the second internal thread; the outer cylinder is provided with a reading window corresponding to the scale ring. In this way, the following beneficial effects are produced:

[0072] First, the scale ring is arranged between the outer cylinder and the inner cylinder, and the rotation of the scale ring is more stable;

[0073] Second, the inner cylinder can surround the rotating ring, driving sleeve and other components, making the structure of the entire injection device more compact and stronger;

[0074] Third, the inner tube and the outer tube can be manufactured separately and then assembled, wherein the outer tube can be made of metal material, which has a more beautiful appearance, and the inner tube can be made of plastic material, which has a lower cost.

[0075] It is understandable that it is also possible not to divide the outer tube and the inner tube, for example, instead of providing an inner tube, an inner thread is provided on the inner wall of the outer tube and an outer thread is provided on the outer wall of the scale ring, so that the spiral lifting of the scale ring can also be achieved.

[0076] In some other embodiments of the present invention, the injection device may further include a support sleeve supporting the transmission component, the support sleeve is sleeved on the push rod and is located between the drive sleeve and the push rod sleeve; the upper end face of the support sleeve is provided with a fifth end face gear ring, the fifth end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits the torque in the second circumferential direction, and the lower end face of the drive sleeve is provided with a sixth end face gear ring that cooperates with the fifth end face gear ring; the support sleeve is fixed to the housing. In this way, the axial position of the drive sleeve is relatively stable, which is a better embodiment. In addition, during injection, the fifth end face gear ring does not rotate, while the sixth end face gear ring rotates with the drive sleeve, and will produce circumferential sliding with the first end face gear ring, producing a click, click friction sound, which is convenient for the user to perceive the injection, which is a better embodiment.

[0077] In other embodiments of the present invention, the injection device may further include a push rod head, the push rod head is connected to the pushing end of the push rod, and the push rod head and the push rod can rotate relative to each other. In this way, when the push rod spirally descends, it will not generate rotational friction on the piston of the medicine bottle, which is a better embodiment.

[0078] In other embodiments of the present invention, the injection device may further include a third elastic part for fixing the axial position of the medicine bottle, one end of the third elastic part abuts against the support sleeve, and the other end abuts against the push rod sleeve, and pushes the push rod sleeve to axially press the medicine bottle. In this way, it is possible to cope with medicine bottles of different specifications or length errors in manufacturing of medicine bottles of the same specification, and the axial position of the push rod sleeve can also be fixed, which is a better embodiment.

[0079] In other embodiments of the present invention, an upper cover may be fixed to the upper end of the scale ring, and the upper cover is above the injection force transmission sleeve; a connecting shaft is fixed to the bottom of the pressing cap, and the connecting shaft passes through the upper cover and is connected to the injection force transmission sleeve; the injection device also includes a fourth elastic part for maintaining the meshing of the third end face gear ring and the fourth end face gear ring, one end of the fourth elastic part abuts against the upper end of the injection force transmission sleeve, and the other end abuts against the bottom end of the upper cover. In this way, the third end face gear ring and the fourth end face gear ring can always be tightly meshed, which is a better embodiment.

[0080] In other embodiments of the present invention, the injection device may further include a limiting sleeve for limiting the circumferential position of the push rod sleeve, the limiting sleeve being fixed to the injection end of the housing; the limiting sleeve being arranged at the lower end of the push rod sleeve, the inner wall of the limiting sleeve being provided with axially extending ribs, and the outer wall of one end of the push rod sleeve being provided with an axial groove corresponding to the ribs. Limiting the circumferential position of the push rod sleeve by the limiting sleeve, rather than directly limiting it by the housing, can simplify the manufacturing difficulty of the housing and reduce the cost.

[0081] In general, the injection device of the embodiment of the present invention has a simpler structure than existing products, and its components are easier to manufacture and more convenient to assemble, and can better control the injection dose.

[0082] In order to understand the present invention more clearly, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments described below are only part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on these embodiments without paying creative work belong to the scope of protection of the present invention.

[0083] To simplify the description, Figure 1 The injection device and its components are described in the direction shown, that is, the top and bottom refer to Figure 1 Above and below.

[0084] like Figure 1-7As shown, an embodiment of the present invention provides an injection device, which includes a housing, a scale ring 200, an injection button, a push rod 400 and a transmission component.

[0085] The scale ring 200 is used to indicate the dosage of the injection. The scale ring 200 can be spirally raised and lowered relative to the housing.

[0086] The injection button is used to apply axial injection thrust.

[0087] The push rod 400 is used to push the piston 7011 of the medicine bottle 701 to move.

[0088] The transmission component is used to transmit the injection thrust of the injection button to the push rod 400. The transmission component includes a slewing ring, a driving sleeve 504 and a push rod sleeve 505.

[0089] The rotary ring is linked with the injection button in a circumferential direction.

[0090] The end face of the drive sleeve 504 opposite to the slewing ring is provided with a first end face gear ring 5041. The first end face gear ring 5041 is a one-way end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. The lower end face of the slewing ring is provided with a second end face gear ring 5011 that cooperates with the first end face gear ring 5041. The drive sleeve 504 rotates with the rotation of the slewing ring in the first circumferential direction. The drive sleeve 504 is sleeved on the push rod 400, and the drive sleeve 504 is linked with the push rod 400 in the circumferential direction. In this embodiment, the first circumferential direction is the counterclockwise direction, and the other direction, that is, the second circumferential direction described below, is the clockwise direction.

[0091] The position of the push rod sleeve 505 is fixed by the housing or other components. The push rod sleeve 505 is sleeved on the push rod 400, and the push rod sleeve 505 is provided with a first internal thread 5051 (see Fig.13 ), the push rod 400 is provided with a first external thread 401 which cooperates with the first internal thread 5051.

[0092] Specifically, the tooth shape of the first end face gear ring 5041 is a right triangle, wherein the right angle side is the side for transmitting circumferential torque. Because of the matching relationship, the tooth shape of the second end face gear ring 5011 is the same as the tooth shape of the first end face gear ring 5041, and the same applies below.

[0093] The first internal thread 5051 and the first external thread 401 are both transmission threads, more specifically, trapezoidal threads.

[0094] Among them, Figure 8As shown, the upper end of the scale ring 200 is provided with a third end face gear ring 201, which is a unidirectional end face gear ring that only transmits torque in the second circumferential direction and has a triangular tooth shape, and the lower end of the injection button is provided with a fourth end face gear ring 3021 that cooperates with the third end face gear ring 201; when the scale ring 200 rotates along the second circumferential direction, the injection button rotates with the rotation of the scale ring 200. The tooth shape of the third end face gear ring 201 is the same as that of the first end face gear ring 5041, but the direction of the torque transmitted is opposite.

[0095] The slewing ring includes a first slewing ring 501, a second slewing ring 502 and a third slewing ring 503, which are nested in sequence in the axial direction and can be mutually telescopic in the axial direction and are linked in the circumferential direction. Specifically, the second slewing ring 502 is sleeved on the outer wall of the first slewing ring 501, and the third slewing ring 503 is sleeved on the outer wall of the second slewing ring 502. The lower end face of the first slewing ring 501 is provided with the second end face gear ring 5011, and the upper end of the third slewing ring 503 is connected to the lower end of the injection button; the first elastic part 506 and the second elastic part 507 for increasing the total axial length are provided between the first slewing ring 501, the second slewing ring 502 and the third slewing ring 503.

[0096] Specifically, the circumferential linkage of the first slewing ring 501 , the second slewing ring 502 , and the third slewing ring 503 can be achieved through the assembly relationship between the key and the keyway.

[0097] Specifically, the first elastic part 506 and the second elastic part 507 are both cylindrical compression springs.

[0098] Among them, Fig. 9 , 10 As shown, the injection button includes a pressing cap 301 and an injection force transmission sleeve 302 which are connected to each other, and the injection force transmission sleeve 302 and the pressing cap 301 can rotate relative to each other; the lower end of the injection force transmission sleeve 302 is provided with the fourth end face gear ring 3021, and the injection force transmission sleeve 302 is connected to the upper end of the third rotating ring 503.

[0099] Among them, Fig.11 , 12 As shown, the shell includes an outer cylinder 101 and an inner cylinder 102 fixed to each other, the outer cylinder 101 and the inner cylinder 102 are radially spaced apart by a preset gap, and the scale ring 200 is rotatably arranged between the outer cylinder 101 and the inner cylinder 102; the inner wall of the scale ring 200 is provided with a second internal thread 202, and the outer circle of the inner cylinder 102 is provided with a second external thread 1021 matching the second internal thread 202; the outer cylinder is provided with a reading window 1011 corresponding to the scale ring 200.

[0100] The second internal thread 202 and the second external thread 1021 are both transmission threads, more specifically, trapezoidal threads.

[0101] In which, the injection device also includes a support sleeve 600 supporting the transmission component, the support sleeve 600 is sleeved on the push rod 400 and is located between the drive sleeve 504 and the push rod sleeve 505; the upper end face of the support sleeve 600 is provided with a fifth end face gear ring 601, the fifth end face gear ring 601 is a unidirectional end face gear ring with a triangular tooth shape that only transmits the torque in the second circumferential direction, and the lower end face of the drive sleeve 504 is provided with a sixth end face gear ring 5043 that cooperates with the fifth end face gear ring 601; the support sleeve 600 is fixed to the shell.

[0102] Specifically, the tooth shape of the fifth end face gear ring 601 is the same as the tooth shape of the first end face gear ring 5041 .

[0103] The injection device further comprises a push rod head 403 , which is connected to the pushing end of the push rod 400 , and the push rod head 403 and the push rod 400 can rotate relative to each other.

[0104] Specifically, the pushing end of the push rod 400 is cylindrical or spherical, and the push rod head 403 is provided with a round hole matching the cylindrical or spherical shape.

[0105] The injection device further includes a third elastic part 5052 for fixing the axial position of the medicine bottle 701, one end of the third elastic part 5052 abuts against the support sleeve 600, and the other end abuts against the push rod sleeve 505, and pushes the push rod sleeve 505 to axially press the medicine bottle 701. The third elastic part 5052 can not only fix the axial position of the medicine bottle 701, but also fix the axial position of the push rod sleeve 505.

[0106] Specifically, the third elastic part 5052 is a cylindrical compression spring. One end of the push rod sleeve 505 is provided with three groups of push rods 5053 extending toward the injection end of the housing, and the push rods 5053 are used to press the medicine bottle 701. Fig.13 shown.

[0107] Among them, an upper cover 204 is fixed to the upper end of the scale ring 200, and the upper cover 204 is above the injection force transmission sleeve 302; a connecting shaft is fixed to the bottom of the pressing cap 301, and the connecting shaft passes through the upper cover and is connected to the injection force transmission sleeve 302; the injection device also includes a fourth elastic part 203 that maintains the engagement between the third end face gear ring 201 and the fourth end face gear ring 3021, one end of the fourth elastic part 203 abuts against the upper end of the injection force transmission sleeve 302, and the other end abuts against the bottom end of the upper cover.

[0108] Specifically, the fourth elastic part 203 is a corrugated washer.

[0109] In which, the injection device also includes a limit sleeve (not shown in the figure) for limiting the circumferential position of the push rod sleeve 505, and the limit sleeve is fixed to the injection end of the shell; the limit sleeve is arranged at the lower end of the push rod sleeve 505, and the inner wall of the limit sleeve is provided with axially extending ribs, and the outer wall of one end of the push rod sleeve 505 is provided with an axial groove 5055 corresponding to the ribs.

[0110] The injection device further includes a fifth elastic part 3011 for limiting the relative position between the pressing cap 301 and the injection force transmission sleeve 302. The fifth elastic part 3011 is sleeved on the connecting shaft at the lower end of the pressing cap 301, and the lower end of the fifth elastic part 3011 abuts against the upper end of the injection force transmission sleeve 302; specifically, the injection force transmission sleeve 302 is provided with a connecting hole matching the connecting shaft, and the pressing cap 301 extends into the connecting hole of the injection force transmission sleeve 302 through the connecting shaft, and circumferential flanges are processed on the outer wall of the connecting shaft and the inner wall of the connecting hole to limit the relative axial positions, but for ease of disassembly, they are not completely stuck in the axial direction, so the fifth elastic part 3011 needs to be further limited by elastic force. Note: Since both are plastic parts, they can be pressed in by forcibly breaking through the resistance of the flange during assembly.

[0111] The injection end of the housing is provided with a third external thread 1023 for mounting the medicine chamber 702, and the medicine chamber 702 is provided with a third internal thread 7021 matching the third external thread 1023; the medicine chamber 702 is used to mount the medicine bottle 701; the medicine chamber 702 and the medicine bottle 701 can be seen in Fig.14 , 15 Specifically, the medicine bin 702 further includes a fourth external thread 7022 disposed below the medicine bin 702 for mounting a needle.

[0112] Among them, Fig.16 As shown, the shell also includes a protective cap 103 for protecting the medicine bottle 701 and the medicine chamber 702, and the protective cap 103 is provided with a hook 1031 for easy insertion into a pocket.

[0113] The upper end of the scale ring 200 is also provided with a knurling 205 for facilitating the rotation of the scale ring 200. The outer wall of the scale ring 200 is provided with a scale 206 indicating the dosage.

[0114] The injection device of this embodiment transmits torque through the end face gear ring with a triangular tooth shape, which can accurately transmit torque and better control the injection dose. Specifically, the control accuracy of this embodiment can reach: 10 microliters.

[0115] In the description of the embodiments of the present invention, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0116] The terms "first\second\third" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence if permitted.

[0117] It should be understood that "one embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present invention, the size of the serial number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The serial numbers of the above-mentioned embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection device, characterized in that: The injection device comprises: A housing; one end of the housing is an injection end connected to the medicine bottle, and the other end is an adjustment end for adjusting the dosage; A graduated ring that is spirally raised and lowered relative to the housing; the graduated ring is located at the adjustment end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures; An injection button for applying an axial injection thrust; the injection button is located at the adjustment end of the housing, and the lower end of the injection button is connected to the upper end of the scale ring; the scale ring spirally descends along the first circumferential direction with the axial injection thrust of the injection button, and the injection button spirally descends with the spiral descent of the scale ring; the injection button comprises a pressing cap and an injection force transmission sleeve that are connected to each other, and the injection force transmission sleeve and the pressing cap can rotate relative to each other; A fifth elastic part; the fifth elastic part connects the pressing cap and the injection force transmission sleeve and is used to limit the axial position relationship between the pressing cap and the injection force transmission sleeve; A push rod for pushing the piston of the medicine bottle to move; the push rod is located in the housing and extends along the axial direction of the housing; the push rod comprises a pushing end connected to the medicine bottle and a force-bearing end connected to the injection button, and the pushing end of the push rod extends out of the injection end of the housing; A transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component includes a slewing ring, a drive sleeve and a push rod sleeve; The slewing ring is located below the injection button, and the slewing ring is linked with the injection button in the circumferential direction; The drive sleeve is located below the slewing ring, and a first end face gear ring is provided on an end face of the drive sleeve opposite to the slewing ring. The first end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. A second end face gear ring that cooperates with the first end face gear ring is provided on the lower end face of the slewing ring. The drive sleeve rotates with the rotation of the slewing ring in the first circumferential direction. The drive sleeve is sleeved on the push rod, and the drive sleeve is linked with the push rod in the circumferential direction. The push rod sleeve is located below the drive sleeve and is fixed in position; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.

2. The injection device according to claim 1, characterized in that A third end face gear ring is provided at the upper end of the scale ring. The third end face gear ring is a unidirectional end face gear ring with a triangular tooth shape and only transmits torque in the second circumferential direction. A fourth end face gear ring cooperating with the third end face gear ring is provided at the lower end of the injection button. When the scale ring rotates along the second circumferential direction, the injection button rotates with the rotation of the scale ring.

3. The injection device according to claim 2, characterized in that The slewing ring comprises a first slewing ring, a second slewing ring and a third slewing ring, which are nested in sequence in the axial direction and can be retracted and contracted with each other in the axial direction, and are linked in the circumferential direction; the lower end face of the first slewing ring is provided with the second end face gear ring, and the upper end of the third slewing ring is connected to the lower end of the injection button; a first elastic part and a second elastic part are provided between the first slewing ring, the second slewing ring and the third slewing ring to increase the total axial length.

4. The injection device according to claim 3, characterized in that The fourth end face gear ring is disposed at the lower end of the injection force transmission sleeve, and the injection force transmission sleeve is connected to the upper end of the third slewing ring.

5. The injection device according to claim 4, characterized in that The shell includes an outer cylinder and an inner cylinder fixed to each other, the outer cylinder and the inner cylinder are radially spaced apart by a preset gap, and the scale ring is rotatably arranged between the outer cylinder and the inner cylinder; the inner wall of the scale ring is provided with a second internal thread, and the outer circle of the inner cylinder is provided with a second external thread matching the second internal thread; the outer cylinder is provided with a reading window corresponding to the scale ring.

6. The injection device according to claim 1 or 2, characterized in that: The injection device also includes a support sleeve supporting the transmission component, the support sleeve is sleeved on the push rod and is located between the drive sleeve and the push rod sleeve; the upper end face of the support sleeve is provided with a fifth end face gear ring, the fifth end face gear ring is a unidirectional end face gear ring with a triangular tooth shape that only transmits the torque in the second circumferential direction, and the lower end face of the drive sleeve is provided with a sixth end face gear ring that cooperates with the fifth end face gear ring; the support sleeve is fixed to the shell.

7. The injection device according to claim 1 or 2, characterized in that: The injection device also includes a push rod head, which is connected to the pushing end of the push rod, and the push rod head and the push rod can rotate relative to each other.

8. The injection device according to claim 6, characterized in that The injection device also includes a third elastic part for fixing the axial position of the medicine bottle, one end of the third elastic part abuts against the support sleeve, and the other end abuts against the push rod sleeve, and pushes the push rod sleeve to press the medicine bottle axially.

9. The injection device according to claim 4, characterized in that An upper cover is fixed to the upper end of the scale ring, and the upper cover is above the injection force transmission sleeve; a connecting shaft is fixed to the bottom of the pressing cap, and the connecting shaft passes through the upper cover and is connected to the injection force transmission sleeve; the injection device also includes a fourth elastic part that maintains the meshing of the third end face gear ring and the fourth end face gear ring, one end of the fourth elastic part abuts against the upper end of the injection force transmission sleeve, and the other end abuts against the bottom end of the upper cover.

10. The injection device according to claim 1 or 2, characterized in that: The injection device also includes a limit sleeve for limiting the circumferential position of the push rod sleeve, and the limit sleeve is fixed to the injection end of the shell; the limit sleeve is arranged on the lower end of the push rod sleeve, and the inner wall of the limit sleeve is provided with axially extending ribs, and the outer wall of one end of the push rod sleeve is provided with an axial groove corresponding to the ribs.

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