A reusable precision injection push device

Abstract

The present invention discloses a recyclable precision injection push device, comprising: a housing; a scale ring spirally lifted relative to the housing; an injection component for applying an axial injection thrust; the injection component comprises a pressing cap and an injection force transmission sleeve connected to each other, and a push rod for pushing the piston of a medicine bottle to move; a transmission component for transmitting the injection thrust of the injection component to the push rod; the transmission component comprises a rotating cylinder, a driving sleeve and a motion conversion sleeve; the rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; the driving sleeve is located below the rotating cylinder, and the end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring, and the upper end face of the driving sleeve is provided with a second end face gear ring matched with the first end face gear ring; the motion conversion sleeve is located below the driving sleeve, and the position is fixed; the motion conversion sleeve is sleeved on the push rod and 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 present invention can better control the injection dose.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a recyclable precision injection pushing 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 devices for delivering medicines with adjustable dosage on the market, there is a problem of inaccurate dosage control. Summary of the invention

[0004] In view of this, the embodiments of the present invention are intended to provide a reusable precision injection pushing device that can better control the pushing dosage.

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

[0006] A reusable precision injection pushing device, the pushing device comprising:

[0007] A shell; one end of the shell is a medicine bottle end connected to the medicine bottle, and the other end is a force-applying end for applying injection force;

[0008] A graduated ring that spirally rises and falls relative to the housing; the graduated ring is located at the force-applying end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures;

[0009] An injection component for applying an axial injection thrust; the injection component is located at the force-applying end of the housing; the injection component comprises a pressing cap and an injection force transmission sleeve connected to each other, and the injection force transmission sleeve and the pressing cap can rotate relative to each other; the upper end of the scale ring is connected to the injection force transmission sleeve; the scale ring spirally descends along the first circumferential direction with the axial injection thrust of the injection component, and the injection component 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 shell and extends along the axial direction of the shell; the push rod includes a pushing end connected to the medicine bottle and a force-bearing end connected to the injection component, and the pushing end of the push rod extends out of the medicine bottle end of the shell;

[0011] A transmission component for transmitting the injection thrust of the injection component to the push rod; the transmission component includes a rotating cylinder, a driving sleeve and a motion conversion sleeve;

[0012] The rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; when the rotating cylinder is subjected to an axial force from above, it is linked with the injection component in the first circumferential direction; the injection force transmission sleeve includes a receiving groove for accommodating the upper end of the rotating cylinder, and the injection force transmission sleeve is axially linked with the rotating cylinder through the receiving groove;

[0013] The driving sleeve is located below the rotating cylinder. The end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring. The first end face gear ring is a one-way end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. The upper end face of the driving sleeve is provided with a second end face gear ring that cooperates with the first end face gear ring. The driving sleeve rotates with the rotation of the rotating cylinder in the first circumferential direction. The driving sleeve is sleeved on the push rod, and the driving sleeve is linked with the push rod in the circumferential direction.

[0014] The motion conversion sleeve is located below the driving sleeve and its position is fixed; the motion conversion sleeve is sleeved on the push rod, the motion conversion 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, both the upper and lower ends of the accommodating groove are open, and the rotating cylinder includes a rotating cylinder body extending into the accommodating groove from the opening at the lower end of the accommodating groove and a cylinder plug inserted into the rotating cylinder body from the opening at the upper end of the accommodating groove; the outer diameter of the cylinder plug is larger than the opening at the lower end of the accommodating groove.

[0016] In the above scheme, the upper end of the scale ring is provided with a third end face gear ring, and the third 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; the upper end of the injection force transmission sleeve is provided with a fourth end face gear ring that cooperates with the third end face gear ring; the lower end of the injection force transmission sleeve is provided with a fifth end face gear ring, and 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 first circumferential direction; the upper end of the rotating cylinder is provided with a sixth end face gear ring that cooperates with the fifth end face gear ring; the outer diameter of the fourth end face gear ring is greater than the outer diameter of the fifth end face gear ring.

[0017] In the above solution, the pushing device further includes a first elastic part for maintaining the axial direction of the rotating cylinder. The first elastic part is sleeved on the rotating cylinder body and is axially located between the cylinder plug and the bottom wall of the accommodating groove.

[0018] In the above scheme, the rotating cylinder includes a first rotating cylinder and a second rotating cylinder, which are axially nested with each other and can be retracted and contracted with each other along the axial direction, and are linked in the circumferential direction; the lower end face of the first rotating cylinder is provided with the first end face gear ring, and the upper end of the second rotating cylinder is provided with the sixth end face gear ring.

[0019] 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.

[0020] In the above scheme, the pushing device also includes a gear sleeve fixed to the outer circle of the lower end of the first rotating cylinder; the upper end face of the gear sleeve is provided with a seventh end face gear ring, and the seventh end face gear ring is a unidirectional end face gear ring that only transmits the torque in the second circumferential direction and has a triangular tooth shape, and the inner cylinder is provided with an eighth end face gear ring that cooperates with the seventh end face gear ring.

[0021] In the above solution, the pushing device further includes a second elastic part for maintaining the engagement between the first end face gear ring and the second end face gear ring, and the second elastic part is located between the driving sleeve and the motion conversion sleeve.

[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 pushing device also includes a third elastic part that maintains the meshing of the third end face gear ring and the fourth end face gear ring, one end of the third 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 solution, the pushing device also includes the fourth elastic part that maintains the meshing of the seventh end face gear ring and the eighth end face gear ring, and the fourth elastic part is located between the rotating cylinder and the driving sleeve.

[0024] The recyclable precision injection pushing device of the embodiment of the present invention comprises: a shell; a scale ring spirally lifted and lowered relative to the shell; an injection component that applies an axial injection thrust; the injection component comprises a pressing cap and an injection force transmission sleeve that are connected to each other, and a push rod that pushes the piston of the medicine bottle to move; a transmission component that transmits the injection thrust of the injection component to the push rod; the transmission component comprises a rotating cylinder, a driving sleeve and a motion conversion sleeve; the rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; the driving sleeve is located below the rotating cylinder, and the end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring, and the upper end face of the driving sleeve is provided with a second end face gear ring that cooperates with the first end face gear ring; the motion conversion sleeve is located below the driving sleeve and its position is fixed; the motion conversion sleeve is sleeved on the push rod and is provided with a first internal thread, and the push rod is provided with a first external thread that cooperates with the first internal thread; it can be seen that the recyclable precision injection pushing 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 a reusable precision injection pushing device provided in 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 assembly of a push rod, a push rod head, a gear sleeve, a drive sleeve, a rotating cylinder and an injection force transmission sleeve in a reusable precision injection pushing device provided by an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of a second rotating cylinder in a recyclable precision injection pushing device provided in an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of a first rotating cylinder in a recyclable precision injection pushing device provided in an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of a drive sleeve in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0037] Fig.11 A schematic diagram of a scale ring in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0038] Fig.12 A schematic diagram of a pressing cap in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0039] Fig.13 A schematic diagram of an injection force transmission sleeve in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0040] Fig.14 A schematic diagram of an outer cylinder in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0041] Fig.15 A schematic diagram of an inner cylinder in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0042] Fig.16 A schematic diagram of a motion conversion sleeve in a reusable precision injection pushing device provided by an embodiment of the present invention;

[0043] Fig.17 A schematic diagram of a medicine chamber in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0044] Fig.18 A schematic diagram of a medicine bottle in a reusable precision injection pushing device provided in an embodiment of the present invention;

[0045] Fig.19 A schematic diagram of a protective cap in a reusable precision injection pushing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] An embodiment of the present invention provides a reusable precision injection pushing device, the pushing device comprising:

[0047] A shell; one end of the shell is a medicine bottle end connected to the medicine bottle, and the other end is a force-applying end for applying injection force;

[0048] A graduated ring that spirally rises and falls relative to the housing; the graduated ring is located at the force-applying end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures;

[0049] An injection component for applying an axial injection thrust; the injection component is located at the force-applying end of the housing; the injection component comprises a pressing cap and an injection force transmission sleeve connected to each other, and the injection force transmission sleeve and the pressing cap can rotate relative to each other; the upper end of the scale ring is connected to the injection force transmission sleeve; the scale ring spirally descends along the first circumferential direction with the axial injection thrust of the injection component, and the injection component spirally descends with the spiral descent of the scale ring;

[0050] A push rod for pushing the piston of the medicine bottle to move; the push rod is located in the shell and extends along the axial direction of the shell; the push rod includes a pushing end connected to the medicine bottle and a force-bearing end connected to the injection component, and the pushing end of the push rod extends out of the medicine bottle end of the shell;

[0051] A transmission component for transmitting the injection thrust of the injection component to the push rod; the transmission component includes a rotating cylinder, a driving sleeve and a motion conversion sleeve;

[0052] The rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; when the rotating cylinder is subjected to an axial force from above, it is linked with the injection component in the first circumferential direction; the injection force transmission sleeve includes a receiving groove for accommodating the upper end of the rotating cylinder, and the injection force transmission sleeve is axially linked with the rotating cylinder through the receiving groove;

[0053] The driving sleeve is located below the rotating cylinder. The end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring. The first end face gear ring is a one-way end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. The upper end face of the driving sleeve is provided with a second end face gear ring that cooperates with the first end face gear ring. The driving sleeve rotates with the rotation of the rotating cylinder in the first circumferential direction. The driving sleeve is sleeved on the push rod, and the driving sleeve is linked with the push rod in the circumferential direction.

[0054] The motion conversion sleeve is located below the driving sleeve and its position is fixed; the motion conversion sleeve is sleeved on the push rod, the motion conversion 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.

[0055] Here, the medicine bottle refers to a bottle loaded with liquid medicine, which is generally fixed in a reusable precision injection push device through a medicine chamber, and a piston connected to a push rod is provided at one end of the medicine bottle facing the push device, and a needle can be connected to the other end.

[0056] 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.

[0057] 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.

[0058] The first end face gear ring is a unidirectional end face gear ring that only transmits the torque in the first circumferential direction, which means that when the first end face gear ring rotates in the first circumferential direction, that is, when the first end face gear ring is the driving gear, the second end face gear ring also follows the first end face gear ring to rotate in the first circumferential direction and can transmit a certain torque. Otherwise, the second end face gear ring will not follow or will only follow under other additional conditions. If other end face gear rings have similar descriptions, the same meaning applies.

[0059] 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.

[0060] In order to make it easier to understand the embodiment of the present invention, the working principle of the embodiment of the present invention is introduced below. The embodiment of the present invention mainly includes four processes: installing the medicine bottle, adjusting the dosage, injecting and resetting, which are as follows:

[0061] 1) Install the medicine bottle. The medicine bottle and the medicine chamber can be separate, that is, the medicine bottle is loaded into the medicine chamber, the medicine chamber is loaded into the device, and after the injection, the medicine bottle is discarded, and the medicine chamber can be reused; or they can be integrated, that is, the medicine chamber and the medicine bottle are integrated, and can be directly installed, and directly discarded after the injection, which is disposable.

[0062] 2) Adjust the dose. Turn the scale ring, and the scale ring 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".

[0063] 3) Injection. Press the injection component, which is connected to the scale ring and applies 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 component. Also, since the injection component is connected to the scale ring, the injection component spirally descends with the spiral descent of the scale ring.

[0064] When the rotating cylinder is subjected to an axial force from above, it is linked with the injection component in the first circumferential direction, so the rotating cylinder rotates in the first circumferential direction. The rotating cylinder drives the driving sleeve to rotate through the first end face gear ring and the second end face gear ring. The driving sleeve is linked with the push rod in the circumferential direction, and the push rod also rotates. Since the push rod and the motion conversion sleeve are connected by the first internal thread and the first external thread, and the axial position of the motion conversion sleeve is fixed, the push rod will spirally descend during rotation and move toward the medicine bottle end of the shell, that is, squeeze the piston of the medicine bottle to complete the injection.

[0065] 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.

[0066] 4) Reset. After the medicine in the medicine bottle is injected, the medicine chamber is disassembled. Axial force is applied from the push end of the push rod to push the push rod upward. Since the push rod and the motion conversion sleeve are connected through the first internal thread and the first external thread, the push rod will spiral up until it returns to the initial position.

[0067] 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.

[0068] The reusable precision injection pushing 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 dosage.

[0069] Furthermore, in other pushing devices, the axial linkage between the injection force transmission sleeve and the rotating cylinder is maintained by setting a compression spring under the rotating cylinder. In this way, although the rotating cylinder can rise axially under the elastic force of the compression spring when adjusting the dosage, it always maintains the connection with the injection force transmission sleeve, but when injecting, it is necessary to overcome the elastic force of the compression spring, and the resistance is relatively large. However, the injection force transmission sleeve of the embodiment of the present invention is axially linked with the rotating cylinder through the accommodating groove, and there is no need to set a compression spring under it. When injecting, the axial resistance is very small, and the operation is easy and smooth.

[0070] 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.

[0071] In other embodiments of the present invention, both the upper and lower ends of the receiving groove are open, and the rotating cylinder includes a rotating cylinder body extending into the receiving groove from the opening at the lower end of the receiving groove and a barrel plug inserted into the rotating cylinder body from the opening at the upper end of the receiving groove; the outer diameter of the barrel plug is larger than the opening at the lower end of the receiving groove. Since the outer diameter of the barrel plug is larger than the opening at the lower end of the receiving groove, when the injection force transmission sleeve moves upward, it can drive the rotating cylinder upward, that is, realize axial linkage, and the barrel plug method is not only simple in structure, but also easy to install and detachable, which is a better implementation method compared with fixing methods such as interference fit.

[0072] In other embodiments of the present invention, 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 the torque in the second circumferential direction and has a triangular tooth shape, and a fourth end face gear ring that cooperates with the third end face gear ring is provided at the upper end of the injection force transmission sleeve; a fifth end face gear ring is provided at the lower end of the injection force transmission sleeve, and the fifth end face gear ring is a unidirectional end face gear ring that only transmits the torque in the first circumferential direction and has a triangular tooth shape, and a sixth end face gear ring that cooperates with the fifth end face gear ring is provided at the upper end of the rotating cylinder; the outer diameter of the fourth end face gear ring is greater than the outer diameter of the fifth end face gear ring. The third end face gear ring and the fourth end face gear ring can be circumferentially linked to the scale ring and the injection force transmission sleeve, and the fifth end face gear ring and the sixth end face gear ring can be circumferentially linked to the injection force transmission sleeve and the rotating cylinder. The linkage through the end face gear rings not only has high precision but also convenient linkage, and the engagement of the two can be controlled by elastic parts, which is a better implementation method. Moreover, the outer diameter of the fourth end face gear ring is greater than the outer diameter of the fifth end face gear ring, so that the resistance below is further reduced during injection, which is a better implementation method.

[0073] In other embodiments of the present invention, the pushing device further includes a first elastic part for maintaining the axial direction of the rotating cylinder, the first elastic part is sleeved on the rotating cylinder body, and is axially located between the cylinder plug and the bottom wall of the accommodating groove. In this way, when the pushing device is not in action, the axial position of the rotating cylinder is maintained; when adjusting the dosage, the injection force transmission sleeve rotates along the second circumferential direction, and the fifth end face gear ring only transmits the torque in the first circumferential direction, similar to a ratchet, so the two will produce sliding teeth, and when the teeth slide, the first elastic part is compressed to produce axial pre-pressure, and the axial pre-pressure can make the sliding process more uniform and smooth, which is a better implementation method.

[0074] In some other embodiments of the present invention, the rotating cylinder includes a first rotating cylinder and a second rotating cylinder, which are axially nested with each other and can be retracted and contracted with each other along the axial direction, and are linked in the circumferential direction; the lower end face of the first rotating cylinder is provided with the first end face gear ring, and the upper end of the second rotating cylinder is provided with the sixth end face gear ring.

[0075] Here, by designing two rotating cylinders 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 cylinder is always in contact with the injection component, and the total length can be reduced during injection to ensure that the scale ring and the injection component descend in sequence, which is a better implementation. It can be understood that only one rotating cylinder is also possible, as long as a structure is designed so that the rotating cylinder is always in contact with the injection component. For example, a long key with a long axial length is set at the bottom of the injection component, and a keyway for the long key to extend into the outer wall of the rotating cylinder is set. When adjusting the dosage, the long key can move axially in the keyway, but does not leave the keyway, and the long key and the keyway can also make the rotating cylinder and the injection component linked in the circumferential direction.

[0076] In some other embodiments of the present invention, the housing comprises 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:

[0077] First, the scale ring is arranged between the outer cylinder and the inner cylinder, and the rotation of the scale ring is more stable;

[0078] Second, the inner cylinder can surround the rotating cylinder, the driving sleeve and other components, making the structure of the entire reusable precision injection pushing device more compact and more solid;

[0079] 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.

[0080] Therefore, it is a better embodiment. It can be understood that it is also possible not to divide it into an outer cylinder and an inner cylinder. For example, instead of providing an inner cylinder, an inner thread is provided on the inner wall of the outer cylinder, 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 realized. The preset radial clearance between the outer cylinder and the inner cylinder is determined according to the wall thickness of the scale ring plus a reasonable clearance fit clearance, which will not be described in detail.

[0081] In some other embodiments of the present invention, the pushing device further comprises a gear sleeve fixed to the outer circle of the lower end of the first rotating cylinder; the upper end face of the gear sleeve is provided with a seventh end face gear ring, the seventh end face gear ring is a unidirectional end face gear ring that only transmits the torque in the second circumferential direction and has a triangular tooth shape, and the inner cylinder is provided with an eighth end face gear ring that cooperates with the seventh end face gear ring. Since the gear sleeve is connected to the inner cylinder, and the inner cylinder and the outer cylinder are both part of the shell and are fixed, when adjusting the dosage, due to the sliding teeth of the fifth end face gear ring and the sixth end face gear ring, the rotating cylinder does not rotate with the injection force transmission sleeve, but its own circumferential position needs to be fixed by the meshing of the seventh end face gear ring and the eighth end face gear ring, so the gear sleeve can better maintain the circumferential position of the rotating cylinder, so that when adjusting the dosage, the pushing device is more stable, which is a better implementation. It can be understood that it is also possible not to provide the seventh end face gear ring and the eighth end face gear ring, so that when adjusting the dosage, the circumferential position of the rotating cylinder may be offset, but it does not affect the use.

[0082] In addition, the seventh end face gear ring and the eighth end face gear ring have another function: during injection, the rotating cylinder rotates along the first circumferential direction, so no torque is transmitted between the seventh end face gear ring and the eighth end face gear ring, and only circumferential sliding, i.e., sliding teeth, are generated, similar to ratchet wheels. In this way, a click-click friction sound is generated, which is convenient for users to perceive the injection, and is a better implementation method. It can be understood that it is also possible not to provide the seventh end face gear ring and the eighth end face gear ring. In this way, during injection, except that the user cannot hear the click sound, it does not affect the use.

[0083] In other embodiments of the present invention, the pushing device further comprises a second elastic part for maintaining the meshing of the first end face gear ring and the second end face gear ring, and the second elastic part is located between the driving sleeve and the motion conversion sleeve. In this way, the meshing of the two is made tighter, and the injection process is made more accurate and stable, which is a better implementation method.

[0084] In other embodiments of the present invention, 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 pushing device also includes a third elastic part for maintaining the meshing of the third end face gear ring and the fourth end face gear ring, one end of the third 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.

[0085] In some other embodiments of the present invention, the pushing device further includes a fourth elastic component for maintaining the meshing of the seventh end face gear ring and the eighth end face gear ring, and the fourth elastic component is located between the rotating cylinder and the driving sleeve. In addition, the fourth elastic component also provides axial pre-pressure when the gears slide between the seventh end face gear ring and the eighth end face gear ring, so that the process of sliding the gears between the seventh end face gear ring and the eighth end face gear ring is more uniform and smooth.

[0086] In general, the reusable precision injection pushing device of the embodiment of the present invention has a simpler structure than existing products, and its components are easier to manufacture and assemble, and can better control the injection dosage.

[0087] 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.

[0088] To simplify the description, Figure 1 The reusable precision injection push device and its components are described in the direction shown, that is, the top and bottom refer to Figure 1 Above and below.

[0089] like Figure 1-7 As shown, an embodiment of the present invention provides a recyclable precision injection pushing device, which includes a housing, a scale ring 200, an injection component, a push rod 400 and a transmission component.

[0090] The housing is the mounting base of the pushing device, and compared with other components, the housing is immovable. One end of the housing is the medicine bottle end connected to the medicine bottle 701, and the other end is the force application end for applying the injection force.

[0091] The scale ring 200 is used to indicate the injection dose. The scale ring 200 can be spirally lifted and lowered relative to the housing. The scale ring 200 is located at the force-applying end of the housing, and the scale ring 200 and the housing are both provided with corresponding thread structures.

[0092] The injection component is used to apply axial injection thrust. The injection component is located at the force-applying end of the housing; the injection component includes a push cap 301 and an injection force transmission sleeve that are connected to each other. The injection force transmission sleeve and the push cap 301 can rotate relative to each other. In this way, when the scale ring 200 drives the injection component to rotate, the push cap 301 does not rotate, which is convenient for users to apply axial force; the push cap 301 and the injection force transmission sleeve refer to Fig.12 , 13 .

[0093] The upper end of the scale ring 200 is connected to the injection force transmission sleeve; the scale ring 200 spirally descends along the first circumferential direction with the axial injection thrust of the injection component, and the injection component spirally descends with the spiral descent of the scale ring 200;

[0094] In this embodiment, the first circumferential direction is a counterclockwise direction, and the other direction, namely the second circumferential direction described below, is a clockwise direction.

[0095] The push rod 400 is used to push the piston 7011 of the medicine bottle 701 to move. The push rod 400 is located in the housing and extends along the axial direction of the housing; the push rod 400 includes a pushing end connected to the medicine bottle 701 and a force-bearing end connected to the injection component, and the pushing end of the push rod 400 extends out of the medicine bottle end of the housing.

[0096] The transmission component is used to transmit the injection thrust of the injection component to the push rod 400. The transmission component includes a rotating cylinder, a driving sleeve 504 and a motion conversion sleeve 505.

[0097] The rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; when the rotating cylinder is subjected to an axial force from above, it is linked with the injection component in the first circumferential direction; the injection force transmission sleeve includes a receiving groove for accommodating the upper end of the rotating cylinder, and the injection force transmission sleeve is axially linked with the rotating cylinder through the receiving groove;

[0098] The driving sleeve 504 is located below the rotating cylinder. The end face of the rotating cylinder opposite to the driving sleeve 504 is provided with a first end face gear ring 5011. The first end face gear ring 5011 is a unidirectional end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. The upper end face of the driving sleeve is provided with a second end face gear ring 5041 that cooperates with the first end face gear ring 5011. The driving sleeve 504 rotates with the rotation of the rotating cylinder in the first circumferential direction; the driving sleeve 504 is sleeved on the push rod 400, and the driving sleeve 504 is linked with the push rod 400 in the circumferential direction; specifically, the driving sleeve 504 and the push rod 400 can be linked in the circumferential direction by means of a key and a keyway. The driving sleeve 504 is shown in FIG. Fig.10 .

[0099] Specifically, the tooth shape of the first end face gear ring 5011 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 5041 is the same as the tooth shape of the first end face gear ring 5011. For the sake of simplicity, the tooth shape of the end face gear ring below is the same as the tooth shape of the first end face gear ring 5011 unless otherwise specified.

[0100] The motion conversion sleeve 505 is located below the drive sleeve 504 and is fixed in position; the motion conversion sleeve 505 is sleeved on the push rod 400, the motion conversion sleeve 505 is provided with a first internal thread 5051, and the push rod 400 is provided with a first external thread 401 that matches the first internal thread 5051. Fig.16 .

[0101] Specifically, the first internal thread 5051 and the first external thread 401 are both transmission threads, more specifically, trapezoidal threads, which are more wear-resistant and have a long service life.

[0102] Specifically, both upper and lower ends of the receiving groove are open, and the rotating cylinder includes a rotating cylinder body extending into the receiving groove from the opening at the lower end of the receiving groove and a cylinder plug 503 inserted into the rotating cylinder body from the opening at the upper end of the receiving groove; the outer diameter of the cylinder plug 503 is larger than the opening at the lower end of the receiving groove.

[0103] Specifically, a third end face gear ring 201 is provided at the upper end of the scale ring 200, and the third end face gear ring 201 is a unidirectional end face gear ring that only transmits the torque in the second circumferential direction and has a triangular tooth shape. The upper end of the injection force transmission sleeve is provided with a fourth end face gear ring 3021 that cooperates with the third end face gear ring 201; the lower end of the injection force transmission sleeve is provided with a fifth end face gear ring 3023, and the fifth end face gear ring 3023 is a unidirectional end face gear ring that only transmits the torque in the first circumferential direction and has a triangular tooth shape. The upper end of the rotating cylinder is provided with a sixth end face gear ring 5021 that cooperates with the fifth end face gear ring 3023; the outer diameter of the fourth end face gear ring 3021 is greater than the outer diameter of the fifth end face gear ring 3023.

[0104] More specifically, 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. Fig.11 .

[0105] Specifically, the pushing device also includes a first elastic part 3025 for maintaining the axial direction of the rotating cylinder, and the first elastic part 3025 is sleeved on the rotating cylinder body and axially located between the barrel plug 503 and the bottom wall of the accommodating groove. Specifically, the first elastic part 3025 is a cylindrical compression spring. The wire diameter, pitch, etc. of the cylindrical compression spring can be designed according to the required pre-pressure, and a relatively accurate pre-pressure value can be obtained. The same is true for the second elastic part 5053, the third elastic part 2041, the fourth elastic part 5045 and the fifth elastic part 3011 described below. Further, the first elastic part 3025 provides an axial pre-tightening force for the sliding teeth of the fifth end face gear ring 3023 and the sixth end face gear ring 5021 during the dosage adjustment process, so that the sliding teeth are smoother.

[0106] Specifically, the rotating cylinder includes a first rotating cylinder 501 and a second rotating cylinder 502, which are mutually nested in the axial direction and can be mutually telescopic in the axial direction, and are linked in the circumferential direction; the lower end face of the first rotating cylinder 501 is provided with the second end face gear ring 5041, and the upper end of the second rotating cylinder 502 is provided with the fifth end face gear ring 3023. More specifically, the circumferential linkage of the first rotating cylinder 501 and the second rotating cylinder 502 can be achieved through the assembly relationship of the key and the keyway, and the barrel plug 503 is connected to the first rotating cylinder 501. The first rotating cylinder 501 and the second rotating cylinder 502 refer to Figure 8 , 9 .

[0107] Specifically, 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 203, and the outer circle of the inner cylinder 102 is provided with a second external thread 1021 matching the second internal thread 203; the outer cylinder 101 is provided with a reading window 1011 corresponding to the scale ring 200, and the outer cylinder 101 and the inner cylinder 102 are provided with a second external thread 1021 matching the second internal thread 203. Fig.14 , 15 .

[0108] Specifically, the pushing device also includes a gear sleeve 600 fixed to the outer circle of the lower end of the first rotating cylinder 501. Specifically, the gear sleeve 600 is sleeved on the lower end of the first rotating cylinder 501 and is fixed to each other in the axial and circumferential directions; the upper end face of the gear sleeve 600 is provided with a seventh end face gear ring 601, and the seventh end face gear ring 601 is a unidirectional end face gear ring that only transmits torque in the second circumferential direction and has a triangular tooth shape. The inner cylinder 102 is provided with an eighth end face gear ring 1023 that cooperates with the seventh end face gear ring 601.

[0109] Specifically, the pushing device further includes a second elastic part 5053 for maintaining the engagement between the first end face gear ring 5011 and the second end face gear ring 5041, and the second elastic part 5053 is located between the driving sleeve 504 and the motion conversion sleeve 505. Specifically, the second elastic part 5053 is a cylindrical compression spring.

[0110] Furthermore, the second elastic part 5053 also has the function of limiting the axial position of the medicine bottle 701. One end of the second elastic part 5053 abuts against the drive sleeve, and the other end abuts against the motion conversion sleeve 505, and pushes the motion conversion sleeve 505 to axially press the medicine bottle 701. In this way, it is possible to cope with the length errors in manufacturing of medicine bottles 701 of different specifications, or medicine bottles 701 of the same specification, and it is also possible to fix the axial position of the motion conversion sleeve 505. One end of the motion conversion sleeve 505 is provided with three groups of push rods 5055 extending toward the medicine bottle end of the shell, and the push rods 5055 are used to press the medicine bottle 701. Fig.16 shown.

[0111] Specifically, 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; a connecting shaft is fixed to the bottom of the pressing cap 301, and the connecting shaft passes through the upper cover 204 and is connected to the injection force transmission sleeve; the pushing device also includes a third elastic part 2041 for maintaining the meshing of the third end face gear ring 201 and the fourth end face gear ring 3021, one end of the third elastic part 2041 abuts against the upper end of the injection force transmission sleeve, and the other end abuts against the bottom end of the upper cover 204. Specifically, the third elastic part 2041 is a cylindrical compression spring.

[0112] Furthermore, in order to lower the manufacturing cost of the injection force transmission sleeve, the injection force transmission sleeve includes a gear barrel 302 and a liner 303, and the gear barrel 302 is sleeved on the liner 303. The liner 303 includes a connecting cavity for accommodating the connecting shaft and a linkage cavity for accommodating the rotating barrel, and the linkage cavity is the above-mentioned accommodating groove for accommodating the upper end of the rotating barrel. The gear barrel is provided with an inner cavity for accommodating the liner 303, and a through hole is provided at the bottom of the inner cavity, and the diameter of the through hole is smaller than the bottom end diameter of the liner 303, but larger than the top end diameter of the rotating barrel, so that the rotating barrel can extend into the accommodating groove through the through hole, but the liner 303 cannot fall out of the gear barrel from the through hole.

[0113] Specifically, the pushing device further includes a fourth elastic part 5045 for maintaining the meshing of the seventh end face gear ring 601 and the eighth end face gear ring 1023, and the fourth elastic part 5045 is located between the rotating cylinder and the driving sleeve 504. Further, the fourth elastic part 5045, because it is located between the rotating cylinder and the driving sleeve 504, not only pushes the rotating cylinder upward, that is, maintains the meshing of the seventh end face gear ring 601 and the eighth end face gear ring 1023, but also has the function of disengaging the first end face gear ring and the second end face gear ring. In this way, in the absence of axial force, the first end face gear ring and the second end face gear ring are in a disengaged state, so that when adjusting the dose, whether increasing the dose or reducing the dose (if the adjustment is too much, the reverse operation may be required - reducing the dose), the first end face gear ring and the second end face gear ring are not engaged, are not subjected to force on each other, and are not easy to wear. The meshing of the seventh end face gear ring 601 and the eighth end face gear ring 1023 can keep the circumferential position of the rotating cylinder relatively fixed during the dosage adjustment process, thereby ensuring the subsequent injection process.

[0114] Specifically, the pushing device may further include a push rod head 403, the push rod head 403 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. In this way, when the push rod 400 spirally descends, it will not generate a rotational friction force on the piston 7011 of the medicine bottle 701. Specifically, the pushing end of the push rod 400 is cylindrical or spherical, and the push rod head 403 is provided with a circular hole matching the cylindrical or spherical shape.

[0115] Specifically, the pushing device may further include a limiting sleeve 105 for limiting the circumferential position of the motion conversion sleeve 505, the limiting sleeve 105 being fixed to the medicine bottle end of the shell; the limiting sleeve 105 being sleeved on the lower end of the motion conversion sleeve 505, the inner wall of the limiting sleeve 105 being provided with axially extending ribs, and the outer wall of one end of the motion conversion sleeve 505 being provided with an axial groove 5057 corresponding to the ribs. Limiting the circumferential position of the motion conversion sleeve 505 by the limiting sleeve 105, rather than directly limiting it by the shell, can simplify the manufacturing difficulty of the shell and reduce the cost.

[0116] Specifically, the pushing device also includes a fifth elastic part 3011 for maintaining the relative position between the pressing cap 301 and the injection force transmission sleeve. 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; the injection force transmission sleeve 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 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, respectively, to limit the mutual axial position. However, in order to facilitate disassembly, the flange is not completely stuck in the axial direction, so the fifth elastic part 3011 is required to maintain the axial position of the pressing cap 301 and the injection force transmission sleeve through elastic force. Note: Since both are plastic parts, they can be pressed in by forcibly breaking through the resistance of the flange during assembly.

[0117] Specifically, the medicine bottle end of the shell is provided with a third external thread 1051 for mounting the medicine chamber 702, and the medicine chamber 702 is provided with a third internal thread 7021 matching the third external thread 1051; 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.17 , 18 .

[0118] Specifically, the medicine bin 702 further includes a fourth external thread 7022 disposed below the medicine bin for mounting a needle. More specifically, the medicine bin is provided with a housing cavity for accommodating a medicine bottle, both ends of which are open, one end is a large end that allows the entire medicine bottle to be inserted, and the other end is a small end that only allows the head of the medicine bottle to be extended, while the bottle body cannot be extended, and the large end has a third internal thread 7021. The head of the medicine bottle is the part for connecting the needle, and the other end is closed at the tail.

[0119] Specifically, Fig.19 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.

[0120] The reusable precision injection push 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.

[0121] In order to understand this embodiment more clearly, the specific situation of each process of the pushing device is described in detail below:

[0122] 1) Install the medicine bottle. This embodiment is a split type, so the installation steps are to load the medicine bottle 701 into the medicine bin 702, and then load the medicine bin 702 into the pushing device. Specifically, the head of the medicine bottle 701 extends from the large end of the medicine bin 702 and extends from the small end of the medicine bin 702; then the large end of the medicine bin 702 is installed to the housing through the third internal thread 7021 and the third external thread 1051.

[0123] 2) Adjust the dose. The scale ring 200 is rotated clockwise along the second circumferential direction, and the scale ring 200 spirally rises relative to the shell. The increased distance between the lower end of the scale ring 200 and the shell in the axial direction during the rising process determines the distance that the push end of the subsequent push rod 400 moves downward, which also determines the dose. By setting evenly distributed scales on the outer wall of the scale ring 200, the set value of the dose can be observed through the reading window 1011 of the outer cylinder 101. Before the scale ring 200 adjusts the dose, the lower end of the scale ring 200 is against the shell and can only rise but not fall. At this time, the scale displays "0".

[0124] Specifically, the scale ring 200 rotates clockwise, and the injection force transmission sleeve is pushed to rotate clockwise through the third end face gear ring 201 and the fourth end face gear ring 3021. However, since the fifth end face gear ring 3023 is a unidirectional tooth that only transmits the torque in the first circumferential direction, the fifth end face gear ring 3023 and the sixth end face gear ring 5021 only produce circumferential sliding, that is, sliding teeth, similar to ratchet, and during the sliding teeth process, the first elastic part 3025 provides axial preload to make the sliding teeth smoother. At the same time, the gear sleeve 600 fixed on the second rotating cylinder 502 is circumferentially fixed to the shell through the seventh end face gear ring 601 and the eighth end face gear ring 1023, so the circumferential position of the rotating cylinder will not be affected by the sliding teeth and remains stable.

[0125] 3) Injection. Press the push cap 301, and the push cap 301 transmits the axial force to the injection force transmission sleeve through the connecting shaft. The injection force transmission sleeve indirectly transmits the axial force to the scale ring 200 through the third end face gear ring 201 and the fourth end face gear ring 3021. The scale ring 200 spirally descends under the action of the second internal thread 203 and the second external thread 1021, that is, the scale ring 200 spirally descends in the counterclockwise direction with the axial injection thrust of the injection component. The spiral descent of the scale ring 200 will cause the injection component to spirally descend with the spiral descent of the scale ring through the dual effects of the meshing of the third end face gear ring 201 and the fourth end face gear ring 3021 and the axial force.

[0126] Here, although the third end face gear ring 201 is a unidirectional end face gear ring that only transmits torque in the second circumferential direction, it does not prevent the fourth end face gear ring 3021 from transmitting axial force to the third end face gear ring 201 under the action of axial force. After the scale ring 200 spirally descends in the counterclockwise direction, the third end face gear ring 201 also spirally descends, so that the fourth end face gear ring 3021 will also maintain meshing with the third end face gear ring 201 under the continuous axial force, and thus will also spirally descend in the counterclockwise direction, thereby driving the rotating cylinder to spirally descend in the counterclockwise direction. That is, when the rotating cylinder is subjected to the axial force from above, it is linked with the injection component in the first circumferential direction, so the rotating cylinder will rotate in the first circumferential direction.

[0127] The rotating cylinder drives the driving sleeve 504 to rotate through the first end face gear ring 5011 and the second end face gear ring 5041. The driving sleeve 504 is linked with the push rod 400 in the circumferential direction, and the push rod 400 also rotates. Since the push rod 400 and the motion conversion sleeve 505 are connected through the first internal thread 5051 and the first external thread 401, and the axial position of the motion conversion sleeve 505 is fixed, the push rod 400 will spirally descend during rotation and move toward the medicine bottle end of the shell, that is, squeeze the piston 7011 of the medicine bottle 701 to complete the injection. The push rod head 403 and the push rod 400 can rotate relative to each other, and the push rod spirally descends, and no rotational friction is generated on the piston 7011 of the medicine bottle 701.

[0128] 4) Reset, after the medicine in the medicine bottle 701 is injected, the medicine chamber 702 is disassembled. Axial force is applied from the pushing end of the push rod 400 to push the push rod upward. Since the push rod 400 and the motion conversion sleeve 505 are connected through the first internal thread and the first external thread, the push rod 400 will spirally rise until it returns to the initial position. The push rod head 403 and the push rod 400 can rotate relative to each other, so the continuous application of axial force is not affected.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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. A reusable precision injection push device, characterized in that: The pushing device comprises: A shell; one end of the shell is a medicine bottle end connected to the medicine bottle, and the other end is a force-applying end for applying injection force; A graduated ring that spirally rises and falls relative to the housing; the graduated ring is located at the force-applying end of the housing, and both the graduated ring and the housing are provided with corresponding thread structures; An injection component for applying an axial injection thrust; the injection component is located at the force-applying end of the housing; the injection component comprises a pressing cap and an injection force transmission sleeve connected to each other, and the injection force transmission sleeve and the pressing cap can rotate relative to each other; the upper end of the scale ring is connected to the injection force transmission sleeve; the scale ring spirally descends along the first circumferential direction with the axial injection thrust of the injection component, and the injection component spirally descends with the spiral descent of the scale ring; A push rod for pushing the piston of the medicine bottle to move; the push rod is located in the shell and extends along the axial direction of the shell; the push rod includes a pushing end connected to the medicine bottle and a force-bearing end connected to the injection component, and the pushing end of the push rod extends out of the medicine bottle end of the shell; A push rod head connected to the pushing end of the push rod; the push rod head can rotate relative to the push rod, and the push rod head is used to connect to the piston of the medicine bottle; A transmission component for transmitting the injection thrust of the injection component to the push rod; the transmission component includes a rotating cylinder, a driving sleeve and a motion conversion sleeve; The rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; when the rotating cylinder is subjected to an axial force from above, it is linked with the injection component in the first circumferential direction; the injection force transmission sleeve includes a receiving groove for accommodating the upper end of the rotating cylinder, and the injection force transmission sleeve is axially linked with the rotating cylinder through the receiving groove; The driving sleeve is located below the rotating cylinder. The end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring. The first end face gear ring is a one-way end face gear ring with a triangular tooth shape that only transmits torque in the first circumferential direction. The upper end face of the driving sleeve is provided with a second end face gear ring that cooperates with the first end face gear ring. The driving sleeve rotates with the rotation of the rotating cylinder in the first circumferential direction. The driving sleeve is sleeved on the push rod, and the driving sleeve is linked with the push rod in the circumferential direction. The motion conversion sleeve is located below the driving sleeve and its position is fixed; the motion conversion sleeve is sleeved on the push rod, the motion conversion 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 reusable precision injection push device according to claim 1, characterized in that: The upper and lower ends of the accommodating groove are both open, and the rotating cylinder includes a rotating cylinder body extending into the accommodating groove from the opening at the lower end of the accommodating groove and a tube plug inserted into the rotating cylinder body from the opening at the upper end of the accommodating groove; the outer diameter of the tube plug is larger than the opening at the lower end of the accommodating groove.

3. The reusable precision injection push device according to claim 2, characterized in that: 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 with a triangular tooth shape that only transmits the torque in the second circumferential direction; a fourth end face gear ring is provided at the upper end of the injection force transmission sleeve to cooperate with the third end face gear ring; a fifth end face gear ring is provided at the lower end of the injection force transmission sleeve, and 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 first circumferential direction; a sixth end face gear ring is provided at the upper end of the rotating cylinder to cooperate with the fifth end face gear ring; the outer diameter of the fourth end face gear ring is greater than the outer diameter of the fifth end face gear ring.

4. The reusable precision injection push device according to claim 3, characterized in that: The pushing device further comprises a first elastic part for maintaining the axial position of the rotating cylinder. The first elastic part is sleeved on the rotating cylinder body and is axially located between the cylinder plug and the bottom wall of the accommodating groove.

5. The reusable precision injection push device according to claim 4, characterized in that: The rotating cylinder includes a first rotating cylinder and a second rotating cylinder, which are axially nested with each other and can be retracted and contracted with each other along the axial direction, and are linked in the circumferential direction; the lower end face of the first rotating cylinder is provided with the first end face gear ring, and the upper end of the second rotating cylinder is provided with the sixth end face gear ring.

6. The reusable precision injection push device according to claim 5, 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.

7. The reusable precision injection push device according to claim 6, characterized in that: The pushing device also includes a gear sleeve fixed to the outer circle of the lower end of the first rotating cylinder; the upper end face of the gear sleeve is provided with a seventh end face gear ring, and the seventh 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 inner cylinder is provided with an eighth end face gear ring that cooperates with the seventh end face gear ring.

8. The reusable precision injection pushing device according to any one of claims 1 to 7, characterized in that: The pushing device further comprises a second elastic part for maintaining the engagement between the first end face gear ring and the second end face gear ring, wherein the second elastic part is located between the driving sleeve and the motion conversion sleeve.

9. The reusable precision injection push 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 pushing device also includes a third elastic part that maintains the meshing of the third end face gear ring and the fourth end face gear ring, one end of the third 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 reusable precision injection push device according to claim 7, characterized in that: The pushing device further comprises a fourth elastic part for maintaining the meshing of the seventh end face gear ring and the eighth end face gear ring, and the fourth elastic part is located between the rotating cylinder and the driving sleeve.

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