CN214181344U - Multi-scale liquid medicine injection pen - Google Patents

Abstract

The utility model relates to a many scales liquid medicine injection pen, it includes button, knob, pen barrel, first transmission guide pin bushing, second transmission guide pin bushing, transmission tooth cover, clutch gear, first stopping gear, second stopping gear, transmission ratch, hob, power gear, nut, connecting pipe, syringe needle, first elastic component, second elastic component and third elastic component. The utility model discloses a many scales liquid medicine injection pen can use repeatedly many times.

Description

Multi-scale liquid medicine injection pen

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to many scales liquid medicine injection pen.

Background

Some special patients in clinic such as diabetes patients, hepatitis patients and the like need to inject insulin, interferon, auxin, vaccine and the like in different occasions, the requirement on the injection dosage precision is very high, if an old disposable syringe is used, liquid medicine needs to be extracted firstly, the operation is inconvenient, the carrying is inconvenient, and accurate medication cannot be effectively achieved. Some liquid medicine injection pens exist in the prior art, can be used for accurately injecting liquid medicine, can store the liquid medicine in the injection pens and are convenient to carry, but most of the liquid medicine injection pens can only be used once, and the original state is difficult to recover for repeated use after the liquid medicine injection pens are used.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims at providing a multi-scale liquid medicine injection pen which can be repeatedly used.

In order to realize the purpose of the utility model, the utility model provides a multi-scale liquid medicine injection pen, which comprises a button, a knob, a pen body tube, a first transmission guide sleeve, a second transmission guide sleeve, a transmission gear sleeve, a clutch gear, a first stopping gear, a second stopping gear, a transmission gear rod, a screw rod, a power gear, a nut, a connecting tube, a needle head, a first elastic part, a second elastic part and a third elastic part;

the knob comprises a rotating head and a rotating sleeve which are connected; the rotating head is positioned at the outer side of the first end of the pen body tube, and the rotating sleeve is movably arranged in the pen body tube; the rotary sleeve is provided with a scale which can be seen through the pen body tube or outside the first end of the pen body tube;

the button movably penetrates through the rotating head, the first end of the button is positioned on the outer side of the rotating head, and the second end of the button is positioned on the inner side of the rotating head; the first end of the first elastic piece is directly or indirectly connected with the button, and the second end of the first elastic piece is connected with the knob;

the first end of the first transmission guide sleeve is positioned in the rotary sleeve, and a first groove which extends spirally is arranged in the first transmission guide sleeve; the second transmission guide sleeve is arranged in the first transmission guide sleeve; the outer surface of the second transmission guide sleeve is provided with a first lug which is matched with the first groove; the first end of the second transmission guide sleeve is connected with the knob; a first gear ring protruding towards the first end of the second transmission guide sleeve is arranged on the inner surface of the second end of the second transmission guide sleeve; the transmission gear sleeve and the clutch gear are arranged in the second transmission guide sleeve; the first end of the transmission gear sleeve is closer to the rotating head relative to the second end of the transmission gear sleeve; the second end of the transmission gear sleeve is provided with a second gear ring protruding in the direction far away from the first end of the transmission gear sleeve, and the direction of the second gear ring is opposite to that of the first gear ring; the clutch gear comprises a third gear ring matched with the first gear ring and a fourth gear ring matched with the second gear ring; when the button is pressed in a direction towards the inner side of the rotating head, the second end of the button is directly or indirectly pressed towards the first end of the transmission gear sleeve, the first gear ring is matched with the third gear ring, and the second gear ring is matched with the fourth gear ring; when the button is released, the first gear ring can rotate relative to the third gear ring or the second gear ring can rotate relative to the fourth gear ring;

the first end of the transmission toothed bar extends into the transmission toothed sleeve, the inner surface of the transmission toothed sleeve is provided with a second convex block, the transmission toothed bar is provided with a second groove extending along the axial direction, and the second convex block is matched with the second groove; the second end of the transmission toothed bar extends out of the second end of the second transmission guide sleeve; a fifth toothed ring is arranged on the end surface of the second end of the transmission toothed bar; the first end of the screw rod extends into the transmission toothed bar, the screw rod is provided with a power gear capable of moving along the axial direction, the power gear is connected with the screw rod in a circumferential linkage manner, the power gear is provided with a sixth toothed ring protruding along the direction towards the first end of the screw rod, when the screw rod moves spirally towards the direction of the outer side of the second end of the transmission toothed bar, the sixth toothed ring is matched with the fifth toothed ring, and when the screw rod moves spirally towards the direction of the outer side of the first end of the transmission toothed bar, the sixth toothed ring can rotate relative to the fifth toothed ring;

the first stopping gear is arranged at the second end of the first transmission guide sleeve, and a seventh gear ring protruding towards the outer side of the second end of the first transmission guide sleeve is arranged on the first stopping gear; the second stopping gear is arranged on the transmission toothed bar in an axially movable manner and is connected with the transmission toothed bar in a circumferential linkage manner, and is provided with an eighth toothed ring protruding towards the first end of the transmission toothed bar and used for being matched with the seventh toothed ring; the first end of the transmission gear rod is provided with a convex ring, and the second elastic piece is arranged between the convex ring and the second stopping gear and provides a force for pushing the second stopping gear to the first stopping gear; when the second transmission guide sleeve moves spirally towards the outer side of the first end of the first transmission guide sleeve relative to the first transmission guide sleeve, the eighth gear ring is matched with the seventh gear ring; when the second transmission guide sleeve moves spirally towards the outer side of the second end of the first transmission guide sleeve relative to the first transmission guide sleeve, the eighth gear ring can rotate relative to the seventh gear ring;

the first end of the connecting pipe is directly or indirectly connected with the second end of the first transmission guide sleeve, the second end of the connecting pipe is used for directly or indirectly and detachably connecting the refill, and the refill can be directly or indirectly connected with the needle head; the nut can be connected with the first end of the connecting pipe in an axially movable manner; the first end of the third elastic piece is abutted with the first end of the nut, and the second end of the third elastic piece is abutted with the second end of the first stopping gear or the first transmission guide sleeve; the hob surface is equipped with the external screw thread, and the nut has the internal thread, external screw thread and interior screw-thread fit, and the hob second end passes the nut and extends to the refill, thereby the hob second end is used for propelling the ejector pad in the refill so that the ejector pad promotes the liquid medicine in the refill and flows along the syringe needle.

The further technical scheme is that a first opening is formed in the pen body tube, faces the outer surface of the rotating sleeve and can be aligned to the scales, and a magnifying lens is arranged on the first opening.

The multi-scale liquid medicine injection pen further comprises a pressing cylinder, the pressing cylinder is arranged in the second transmission sleeve, a clamping sleeve and an annular groove located on the outer side of the clamping sleeve are arranged at the first end of the pressing cylinder, and the second end of the pressing cylinder is used for abutting against the transmission gear sleeve; the first end of the button comprises an end plate which is positioned at the outer side of the rotating head; the second end of the button comprises a connecting column which is connected with the clamping sleeve; the first end of the first elastic piece is abutted with the annular groove, and the second end of the first elastic piece is abutted with the rotating head.

The further technical scheme is that a third convex block is arranged on the inner surface of the clamping sleeve, a third groove is arranged on the outer surface of the connecting column, and the third convex block is matched with the third groove.

The further technical scheme is that a fourth groove extending along the axial direction is formed in the screw rod, a fourth convex block is arranged on the inner surface of the power gear, and the fourth convex block is matched with the fourth groove.

The multi-scale liquid medicine injection pen further comprises a pen core frame, wherein the pen core frame is used for placing a pen core; the first end of the refill holder is detachably connected with the second end of the connecting pipe, and the second end of the refill holder is connected with the needle head.

The further technical scheme is that the pen core frame is provided with a second opening extending along the axial direction, and the second opening faces the pen core.

The further technical scheme is that a fifth lug is arranged on the outer surface of the first end of the connecting pipe, a fifth groove is formed in the second end of the first transmission guide sleeve, and the fifth lug is matched with the fifth groove.

The inner surface of the first end of the connecting pipe is provided with a sixth lug extending along the axial direction, and the tail end of the sixth lug is provided with a concave structure; the outer surface of the nut is provided with a sixth groove extending along the axial direction, and the bottom end of the sixth groove is provided with a raised stop block; the sixth bump is matched with the sixth groove, and the concave structure is matched with the stop block.

The further technical scheme is that a seventh convex block is arranged on the outer surface of the connecting pipe, a seventh groove is formed in the second end of the first transmission guide sleeve, and the seventh convex block is matched with the seventh groove.

The multi-scale liquid medicine injection pen further comprises a pen cap, and the pen cap is detachably connected with the second end of the pen body tube.

The further technical scheme is that the maximum dosage of the pen core is 1.5mL, the scales of the multi-scale liquid medicine injection pen are divided into 76 grids, and the maximum injection amount per time is 0.75 mL.

The further technical scheme is that the first gear ring, the second gear ring, the third gear ring, the fourth gear ring, the seventh gear ring and the eighth gear ring respectively comprise at least 30 teeth which are uniformly distributed along the circumferential direction.

A further technical solution is that the first toothed ring can make a sound when rotating relative to the third toothed ring, when the second toothed ring rotates relative to the fourth toothed ring or when the eighth toothed ring rotates relative to the seventh toothed ring.

Compared with the prior art, the utility model discloses can gain following beneficial effect:

the utility model discloses a many scales liquid medicine injection pen carries and convenient to use to can used repeatedly many times. Specifically, the utility model discloses a circumference linkage, relative pivoted gear when reversal during multiunit corotation for play when adjusting the injection volume and push the hob of liquid medicine effect and not roll back, the hob can be driven and remove when pushing the injection, can promote the hob when used repeatedly once more and reset. In addition, the utility model can adjust the injection amount according to the needs, and meet the requirements of different patients; the scales can be observed through the magnifying glass, so that the glasses are convenient for users with poor eyesight to use; the adjusting knob or the liquid medicine pushing device can make a sound when the liquid medicine is pushed, so that the use of a patient is more convenient.

Drawings

Fig. 1 is an exploded view of the embodiment of the multi-scale liquid medicine injection pen of the present invention.

Fig. 2 is a structural exploded sectional view of the embodiment of the multi-scale liquid medicine injection pen of the present invention.

Fig. 3 is a sectional view of the embodiment of the multi-scale liquid medicine injection pen of the present invention.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Detailed Description

As shown in fig. 1 to 3, the present invention provides a multi-scale liquid medicine injection pen, which comprises a button 10, a knob 20, a pen body tube 30, a first transmission guide sleeve 40, a second transmission guide sleeve 50, a transmission gear sleeve 60, a clutch gear 70, a first stopping gear 80, a second stopping gear 90, a transmission gear rod 100, a screw rod 110, a power gear 120, a nut 130, a connecting tube 140, a piston 150, a needle 160, a first elastic member 170, a second elastic member 180, a third elastic member 190, a pressing cylinder 200, a pen core holder 210 and a pen cap 220.

Wherein, knob 20 includes swivel head 21 and rotatory sleeve pipe 22 that link, and swivel head 21 is located the barrel 30 first end outside, and rotatory sleeve pipe 22 is movably set up in barrel 30, and rotatory sleeve pipe 22 can stretch out and can retract into barrel 30 first end spirally from barrel 30 first end. The rotating sleeve 22 has a scale on its outer surface that can be seen through the barrel 30 or outside the first end of the barrel 30. In this embodiment, the pen body tube 30 is provided with a first opening 31, the first opening 31 faces the outer surface of the rotary sleeve 22 and can be aligned with the scale, and the first opening 31 is provided with a magnifying lens 32 for the user to observe the magnified scale reading mark. The graduations may include graduations helically disposed on the rotating sleeve 22 and reading marks marked on the graduations, such as equally or unequally disposed along the helical graduations, and the first opening 31 may be consistently aligned with the helical graduations of the rotating sleeve 22 as the knob 20 is helically rotated relative to the barrel 30. Alternatively, the scale may comprise a plurality of separate scale markings distributed axially along the rotating sleeve 22 and reading marks marked on the scale markings, forming a plurality of scale divisions.

The button 10 movably passes through the rotator 21, a first end of the button 10 is located outside the rotator 21, a second end of the button 10 is located inside the rotator 21, a first end of the first elastic member 170 is directly or indirectly connected to the button 10, and a second end of the first elastic member 170 is connected to the knob 20. The first elastic member 170 may be a spring, for example.

The first end of the first transmission guide 40 is located in the rotary sleeve 22, and a first groove 41 extending spirally is formed in the first transmission guide 40. The second transmission guide sleeve 50 is arranged in the first transmission guide sleeve 40, a first bump 51 is arranged on the outer surface of the second transmission guide sleeve 50, and the first bump 51 is matched with the first groove 41, so that the second transmission guide sleeve 50 can move spirally relative to the first transmission guide sleeve 40. The first end of the second driving guide 50 is connected with the knob 20, so that the second driving guide 50 and the knob 20 can move in a screw type in linkage. The inner surface of the second end of the second transmission guide 50 is provided with a first gear ring 52 protruding towards the first end of the second transmission guide 50. The transmission gear sleeve 60 and the clutch gear 70 are arranged in the second transmission guide sleeve 50, the first end of the transmission gear sleeve 60 is closer to the rotating head 21 relative to the second end of the transmission gear sleeve 60, the second end of the transmission gear sleeve 60 is provided with a second gear ring 61 protruding in a direction away from the first end of the transmission gear sleeve 60, the direction of the second gear ring 61 is opposite to that of the first gear ring 52, and the clutch gear 70 comprises a third gear ring 71 used for being matched with the first gear ring 52 and a fourth gear ring 72 used for being matched with the second gear ring 61. When the button 10 is pressed in a direction towards the inside of the rotator head 21, the second end of the button 10 is directly or indirectly pressed against the first end of the transmission gear sleeve 60, the first gear ring 52 is engaged with the third gear ring 71, and the second gear ring 61 is engaged with the fourth gear ring 72, so that the second transmission guide 50 can drive the transmission gear sleeve 60 to rotate. When the button 10 is released, that is, the button 10 is not pressed in the direction of the inner side of the rotary head 21, the first gear ring 52 can rotate relative to the third gear ring 71 or the second gear ring 61 can rotate relative to the fourth gear ring 72, so that when the rotary head 21 is rotated without pressing the button 10 to adjust to a desired scale, the second transmission guide sleeve 50 does not drive the transmission gear sleeve 60 to rotate no matter clockwise or counterclockwise, at this time, the first elastic member 170 can provide a weak acting force on the first end of the button 10, so that the first gear ring 52 and the third gear ring 71, and the second gear ring 61 and the fourth gear ring 72 are not completely separated to cause difficult re-engagement, and the relative rotation therebetween is relative sliding along the inclined surfaces of the teeth. This function can be achieved by choosing the appropriate direction of inclination of the teeth.

In this embodiment, the pressing cylinder 200 is disposed in the second driving sleeve, and the button 10 is connected to the pressing cylinder 200 to apply pressure to the first end of the driving gear sleeve 60 through the pressing cylinder 200. The first end of the pressing cylinder 200 is located inside the rotating head 21, the first end of the pressing cylinder 200 is provided with a clamping sleeve 201 and an annular groove 202 located outside the clamping sleeve 201, and the second end face of the pressing cylinder 200 is used for abutting against the transmission gear sleeve 60. The first end of button 10 includes end plate 11, and end plate 11 is located the outside of rotating head 21, and button 10 second end includes spliced pole 12, and spliced pole 12 is connected with joint cover 201, and for example joint cover 201 internal surface is equipped with third lug 203, and spliced pole 12 surface is equipped with third recess 13, thereby third lug 203 and the cooperation of third recess 13 realize button 10 and press being connected of a section of thick bamboo 200 for button 10 and press a section of thick bamboo 200 simple to operate. The connection post 12 or the clamping sleeve 201 can be moved through the rotary head 21. A first end of the first elastic member 170 is connected to, e.g., abuts, the annular groove 202 to prevent the first elastic member 170 from being separated from the pressing cylinder 200, and a second end of the first elastic member 170 is connected to, e.g., abuts, an inner end surface of the rotary head 21.

The first end of the transmission toothed bar 100 extends into the transmission toothed sleeve 60, the inner surface of the transmission toothed sleeve 60 is provided with a second bump 62, the transmission toothed bar 100 is provided with a second groove 101 extending along the axial direction, and the second bump 62 is matched with the second groove 101, so that the transmission toothed bar 100 is in circumferential linkage with the transmission toothed sleeve 60, and the transmission toothed bar 100 can move along the axial direction relative to the transmission toothed sleeve 60. The second end of the transmission toothed bar 100 extends out of the second end of the second transmission guide sleeve 60, and a fifth toothed ring 102 is arranged on the end face of the second end of the transmission toothed bar 100. The first end of the screw rod 110 extends into the transmission rack bar 100, the screw rod 110 is provided with a power gear 120 capable of moving along the axial direction, the power gear 120 is connected with the screw rod 110 in a circumferential linkage manner, for example, the screw rod 110 is provided with a fourth groove 111 extending along the axial direction, the inner surface of the power gear 120 is provided with a fourth bump 121, and the fourth bump 121 is matched with the fourth groove 111. The power gear 120 is provided with a sixth gear ring 122 protruding in a direction toward the first end of the screw rod 110, the sixth gear ring 122 is used for being matched with the fifth gear ring 102, and when the screw rod 110 moves spirally in a direction toward the outer side of the second end of the transmission gear rod 100, the sixth gear ring 122 is meshed with the fifth gear ring 102, so that the transmission gear rod 100 can drive the screw rod 110 to rotate. When the screw rod 110 is screwed in the direction of the outside of the first end of the driving rack 100, the sixth toothed ring 122 can rotate relative to the fifth toothed ring 102. This function can be achieved by choosing the appropriate direction of inclination of the teeth.

The first anti-backup gear 80 is disposed, for example, fixedly connected to the second end of the first transmission guide 40, and the seventh gear ring 81 protruding to the outside of the second end of the first transmission guide 40 is disposed on the first anti-backup gear 80. The second stopping gear 90 is axially movably arranged on the transmission rack bar 100 and is connected with the transmission rack bar 100 in a circumferential linkage manner, the second stopping gear 90 is provided with an eighth gear ring 91 protruding towards the first end of the transmission rack bar 100, and the eighth gear ring 91 is used for being matched with the seventh gear ring 81. The driving rack 100 is provided at a first end with a protruding ring 103, and a second elastic member 180 is disposed between the protruding ring 103 and the second stopping gear 90 and provides a force pushing the second stopping gear 90 toward the first stopping gear 80 so that the eighth gear 91 can be in contact with the seventh gear 81, and the second elastic member 180 may be a spring. When the second transmission guide sleeve 50 moves spirally relative to the first transmission guide sleeve 40 in the direction of the first end of the first transmission guide sleeve 40, the eighth gear ring 91 is engaged with the seventh gear ring 81, so as to prevent the transmission rack 100 from rotating therewith. When the second transmission guide 50 moves spirally relative to the first transmission guide 40 in a direction of the second end of the first transmission guide 40, the eighth gear ring 91 can rotate relative to the seventh gear ring 81, so that the transmission gear lever 100 can rotate along with the second transmission guide 50. This function can be achieved by choosing the appropriate direction of inclination of the teeth.

The first end of the connection tube 140 is directly or indirectly connected with the second end of the first transmission guide 40, the second end of the connection tube 140 is used for directly or indirectly and detachably connecting the pen core 230, and the pen core 230 can be directly or indirectly connected with the needle 160 in a detachable mode. In this embodiment, the pen core 230 can be placed in the pen core holder 210, the first end of the pen core holder 210 is detachably connected to the second end of the connecting tube 140, the second end of the pen core holder 210 is connected to the needle 160, the pen core 230 can be replaced by detaching the first end of the pen core holder 210 from the connecting tube 140, and the pen core holder 210 is installed back to the second end of the connecting tube 140 after replacement to realize reuse. The cartridge holder 210 is preferably provided with a second opening 211 extending in the axial direction, the second opening 211 faces the cartridge 230, and the user can see the remaining amount of the medical fluid in the cartridge 230 through the second opening 211.

The nut 130 is connected to a first end of the connection pipe 140 in an axially movable manner, the nut 130 cannot move circumferentially with respect to the connection pipe 140, a first end of the third elastic member 190 abuts against the first end of the nut 130, the power gear 120 is rotatably connected to the nut 130, a second end of the third elastic member 190 abuts against the first stopping gear 80 or a second end of the first transmission guide 40 to push the nut 130 toward the connection pipe 140, and the third elastic member 190 may be a spring. The screw rod 110 is provided with an external thread 112 on the outer surface, the nut 130 is provided with an internal thread 131, the external thread 112 is matched with the internal thread 131, the second end of the screw rod 110 passes through the nut 130 and extends to the pen core 230, the second end of the screw rod 110 is connected with the piston 150, and the piston 150 is used for pushing the push block 231 in the pen core 230 so that the push block 231 pushes the liquid medicine in the pen core 230 to flow out along the needle 160. The nut 19 can move axially, so that the assembly and the replacement of the nut 19 are convenient, and the screw rod 110 can be prevented from being locked when being retracted and reset.

In this embodiment, the inner surface of the first end of the connection tube 140 is provided with a sixth protrusion 141 extending along the axial direction, the end of the sixth protrusion 141 is provided with a recessed structure 142, the outer surface of the nut 130 is provided with a sixth groove 132 extending along the axial direction, the bottom end of the sixth groove 132 is provided with a raised stopper 133, the sixth protrusion 141 is matched with the sixth groove 132 so as to realize that the nut 130 and the connection tube 140 are connected in an axially movable manner, and the recessed structure 142 is matched with the stopper 133 so as to provide a limit position for preventing the nut 130 from moving to the second end of the connection tube 140 excessively.

In this embodiment, the outer surface of the connection pipe 140 is provided with a seventh protrusion 143, the second end of the first transmission guide 40 is provided with a seventh groove 42, and the seventh protrusion 143 is matched with the seventh groove 42, so that the connection pipe 140 is connected with the first transmission guide 40. The outer surface of the connecting tube 140 may further be provided with an eighth protrusion 144, the second end of the pen body tube 30 is provided with an eighth groove 33, and the eighth protrusion 144 is matched with the eighth groove 33 to connect the pen body tube 30 and the connecting tube 140. The cap 220 is adapted to be removably coupled to the second end of the barrel 30, thereby protecting the needle 160.

Preferably, when the first ring gear 52 rotates relative to the third ring gear 71, when the second ring gear 61 rotates relative to the fourth ring gear 72, or when the eighth ring gear 91 rotates relative to the seventh ring gear 81, a sound, for example, a click sound, is generated when one tooth falls into the tooth groove of the next tooth opposite thereto due to a height difference after moving along the inclined surface of the tooth opposite thereto, and the user is prompted to adjust the injection amount by rotating the rotary head 21 or to press the button 10 to perform injection, so that the user can conveniently adjust the injection amount and control the rotation speed.

Preferably, the first gear ring 52, the second gear ring 61, the third gear ring 71 and the fourth gear ring 72 are all evenly distributed with at least 30 teeth along the circumferential direction, so that the control precision of the second transmission guide sleeve 50 rotating along the circumferential direction is higher when the injection dosage is adjusted. Correspondingly, the seventh toothed ring 81 and the eighth toothed ring 91 can also each have the same number of at least 30 teeth.

In this embodiment, the size of the multi-scale medical liquid injection pen, the pitch of the spiral first groove 41 of the first transmission guide 40, the pitch of the external thread 112 of the screw rod 110 and the internal thread 131 of the nut 130, etc. may be adjusted as required to obtain the required pen core dose and the maximum injection amount per time. For example, the number of the reading marks on the scale mark can be 76, so as to meet the requirements of different injection quantities, and the number and the arrangement positions of the reading marks correspond to the matching of the teeth between the first gear ring 52 and the third gear ring 71 and between the second gear ring 61 and the fourth gear ring 72. For example, the maximum dose of the pen core may be 1.5mL, the maximum injection amount of a single time of the multi-scale liquid medicine injection pen may be 0.75mL, and for a 76-grid injector, the 19 th, 38 th, 57 th and 76 th grids correspond to 0.1875mL, 0.375mL, 0.5625mL and 0.75mL, respectively, and a user may rotate the knob 20 to an appropriate scale according to the requirement of the injection dose, so that the liquid medicine in the pen core 230 may be used up twice when the maximum amount is used.

The use process of the multi-scale liquid medicine injection pen mainly comprises an adjusting process and an injection process. Before adjustment, the cartridge holder 210 is attached to the connection tube 140 after the cartridge 230 is loaded. In the adjusting process, the rotating head 21 is adjusted, so that the knob 20 moves spirally towards the outside of the first end of the pen body tube 30, the knob 20 drives the second transmission guide sleeve 50 to move spirally towards the outside of the first end of the pen body tube 30, and the moving distance corresponds to the injection dosage. At this time, under the action of the second elastic member 180, the first stopping gear 80 is engaged with the second stopping gear 90, and the driving toothed bar 100 and the driving toothed sleeve 60 cannot rotate circumferentially along with the second driving guide sleeve 50, so as to prevent the screw 110 from retracting. Further, the button 10 is not pressed from the outside, and the first ring gear 52 can rotate with respect to the third ring gear 71 or the second ring gear 52 can rotate with respect to the fourth ring gear 72, and a sound can be generated when the button rotates.

In the injection process, the knob 20 is spirally moved towards the outside of the second end of the pen body tube 30 by pressing the button 10, the button 10 presses the transmission gear sleeve 60 and the clutch gear 70 through the pressing barrel 200, the first gear ring 52 is meshed with the third gear ring 71, the second gear ring 52 is meshed with the fourth gear ring 72, so that the second transmission guide sleeve 50 drives the transmission gear sleeve 60 to rotate, the transmission gear sleeve 60 drives the transmission gear rod 100 to rotate, the transmission gear rod 100 drives the screw rod 110 to rotate, and the screw rod 110 can axially move relative to the nut 130 and push the push block 231 in the pen core 230 to extrude the liquid medicine in the pen core 230. At this time, the first and second backstop gears 80 and 90 can relatively rotate, and sound can be generated when rotating. After the injection is completed, the pen cartridge 210 is removed, and the screw rod 110 can be pushed back to reset, so that the injection pen can be repeatedly used. When the screw rod 110 is pushed back, the sixth gear ring 122 can rotate reversely relative to the fifth gear ring 102, under the action of the second elastic element 180, the first anti-back gear 80 and the second anti-back gear 90 are meshed, the transmission gear rod 100 and the transmission gear sleeve 60 cannot rotate circumferentially, and the transmission gear rod 100 can move axially so as to allow the fifth gear ring 102 and the sixth gear ring 122 to rotate relatively.

Finally, it should be emphasized that the above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A multi-scale liquid medicine injection pen is characterized by comprising a button, a knob, a pen body tube, a first transmission guide sleeve, a second transmission guide sleeve, a transmission gear sleeve, a clutch gear, a first stopping gear, a second stopping gear, a transmission gear rod, a screw rod, a power gear, a nut, a connecting tube, a needle head, a first elastic part, a second elastic part and a third elastic part;

the knob comprises a rotating head and a rotating sleeve which are connected; the rotating head is positioned outside the first end of the pen body tube, and the rotating sleeve is movably arranged in the pen body tube; the rotating sleeve is provided with a scale which can be seen through the pen barrel or outside the first end of the pen barrel;

the button is movably passed through the rotator head, the button first end is located outside the rotator head, the button second end is located inside the rotator head; the first end of the first elastic piece is directly or indirectly connected to the button, and the second end of the first elastic piece is connected with the knob;

the first end of the first transmission guide sleeve is positioned in the rotary sleeve, and a first groove which extends spirally is arranged in the first transmission guide sleeve; the second transmission guide sleeve is arranged in the first transmission guide sleeve; a first lug is arranged on the outer surface of the second transmission guide sleeve and matched with the first groove; the first end of the second transmission guide sleeve is connected with the knob; a first gear ring protruding towards the first end of the second transmission guide sleeve is arranged on the inner surface of the second end of the second transmission guide sleeve; the transmission gear sleeve and the clutch gear are arranged in the second transmission guide sleeve; the drive sleeve first end is closer to the rotary head than the drive sleeve second end; the second end of the transmission gear sleeve is provided with a second gear ring protruding in the direction far away from the first end of the transmission gear sleeve, and the directions of the second gear ring and the first gear ring are opposite; the clutch gear comprises a third gear ring matched with the first gear ring and a fourth gear ring matched with the second gear ring; when the button is pressed in a direction towards the inside of the rotary head, the button second end is directly or indirectly pressed towards the drive gear sleeve first end, the first gear ring cooperates with the third gear ring, the second gear ring cooperates with the fourth gear ring; when the button is released, the first ring gear is rotatable relative to the third ring gear or the second ring gear is rotatable relative to the fourth ring gear;

the first end of the transmission toothed bar extends into the transmission toothed sleeve, a second convex block is arranged on the inner surface of the transmission toothed sleeve, a second groove extending along the axial direction is arranged on the transmission toothed bar, and the second convex block is matched with the second groove; the second end of the transmission toothed bar extends out of the second end of the second transmission guide sleeve; a fifth toothed ring is arranged on the end surface of the second end of the transmission toothed bar; the first end of the screw rod extends into the transmission toothed bar, the screw rod is provided with a power gear capable of moving along the axial direction, the power gear is connected with the screw rod in a circumferential linkage manner, the power gear is provided with a sixth toothed ring protruding along the direction towards the first end of the screw rod, when the screw rod moves spirally towards the direction of the outer side of the second end of the transmission toothed bar, the sixth toothed ring is matched with the fifth toothed ring, and when the screw rod moves spirally towards the direction of the outer side of the first end of the transmission toothed bar, the sixth toothed ring can rotate relative to the fifth toothed ring;

the first stopping gear is arranged at the second end of the first transmission guide sleeve, and a seventh gear ring protruding towards the outer side of the second end of the first transmission guide sleeve is arranged on the first stopping gear; the second stopping gear is arranged on the transmission toothed bar in an axially movable manner and is connected with the transmission toothed bar in a circumferential linkage manner, the second stopping gear is provided with an eighth toothed ring protruding towards the first end of the transmission toothed bar, and the eighth toothed ring is used for being matched with the seventh toothed ring; a convex ring is arranged at the first end of the transmission toothed bar, and the second elastic piece is arranged between the convex ring and the second stopping gear and provides a force for pushing the second stopping gear to the first stopping gear; when the second transmission guide sleeve moves spirally relative to the first transmission guide sleeve towards the outer side of the first end of the first transmission guide sleeve, the eighth gear ring is matched with the seventh gear ring; when the second transmission guide sleeve moves spirally relative to the first transmission guide sleeve towards the direction outside the second end of the first transmission guide sleeve, the eighth gear ring can rotate relative to the seventh gear ring;

the first end of the connecting pipe is directly or indirectly connected with the second end of the first transmission guide sleeve, the second end of the connecting pipe is used for directly or indirectly and detachably connecting a refill, and the refill can be directly or indirectly connected with the needle head; the nut is connected with the first end of the connecting pipe in an axially movable manner; the first end of the third elastic piece is abutted with the first end of the nut, and the second end of the third elastic piece is abutted with the first stopping gear or the second end of the first transmission guide sleeve; the outer surface of the screw rod is provided with an external thread, the nut is provided with an internal thread, the external thread is matched with the internal thread, the second end of the screw rod penetrates through the nut and extends to the pen core, and the second end of the screw rod is used for pushing the push block in the pen core so as to enable the push block to push the liquid medicine in the pen core to flow out along the needle head.

2. The multi-scale liquid medicine injection pen according to claim 1, wherein:

the pen body tube is provided with a first opening, the first opening faces the outer surface of the rotary sleeve and can be aligned to the scale, and the first opening is provided with a magnifying lens.

3. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

the multi-scale liquid medicine injection pen further comprises a pressing cylinder, and the pressing cylinder is arranged in the second transmission sleeve; the first end of the pressing cylinder is provided with a clamping sleeve and an annular groove positioned on the outer side of the clamping sleeve, the annular groove is positioned on the inner side of the rotating head, and the second end of the pressing cylinder is used for abutting against the transmission gear sleeve;

the button first end comprises an end plate located outside the rotator head; the button second end comprises a connecting column which is connected with the clamping sleeve, and the connecting column or the clamping sleeve movably penetrates through the rotating head;

the first elastic member first end is connected with the annular groove, and the first elastic member second end is connected with the rotary head.

4. The multi-scale liquid medicine injection pen according to claim 3, wherein:

the inner surface of the clamping sleeve is provided with a third convex block, the outer surface of the connecting column is provided with a third groove, and the third convex block is matched with the third groove.

5. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

the screw rod is provided with a fourth groove extending along the axial direction, a fourth convex block is arranged on the inner surface of the power gear, and the fourth convex block is matched with the fourth groove.

6. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

the multi-scale liquid medicine injection pen further comprises a pen core frame, and the pen core frame is used for placing a pen core; the first end of the pen core frame is detachably connected with the second end of the connecting pipe, and the second end of the pen core frame is connected with the needle head;

and the second end of the screw rod is connected with a piston, and the piston is in contact with the push block.

7. The multi-scale liquid medicine injection pen according to claim 6, wherein:

the refill frame is provided with a second opening extending along the axial direction, and the second opening faces the refill.

8. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

the outer surface of the first end of the connecting pipe is provided with a fifth lug, the second end of the first transmission guide sleeve is provided with a fifth groove, and the fifth lug is matched with the fifth groove.

9. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

a sixth bump extending along the axial direction is arranged on the inner surface of the first end of the connecting pipe, and a concave structure is arranged at the tail end of the sixth bump; the outer surface of the nut is provided with a sixth groove extending along the axial direction, and the bottom end of the sixth groove is provided with a raised stop block; the sixth bump is matched with the sixth groove, and the concave structure is matched with the stop block.

10. The multi-scale liquid medicine injection pen according to claim 1 or 2, wherein:

a seventh lug is arranged on the outer surface of the connecting pipe, a seventh groove is formed in the second end of the first transmission guide sleeve, and the seventh lug is matched with the seventh groove;

the multi-scale liquid medicine injection pen further comprises a pen cap, and the pen cap is detachably connected with the second end of the pen body tube;

the maximum dosage of the refill is 1.5 mL; the maximum injection amount of the multi-scale liquid medicine injection pen in one time is 0.75 mL;

the first gear ring, the second gear ring, the third gear ring, the fourth gear ring, the seventh gear ring and the eighth gear ring respectively comprise at least 30 teeth which are uniformly distributed along the circumferential direction;

the sound may be generated when the first ring gear rotates relative to the third ring gear, when the second ring gear rotates relative to the fourth ring gear, or when the eighth ring gear rotates relative to the seventh ring gear.

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