CN220175773U - Manual operation fixed dose multiple use's brake mechanism - Google Patents

Abstract

The utility model discloses a brake mechanism for manually operating fixed dose for multiple use, which relates to the technical field of injection equipment and comprises the following components: a rear body; an inner body; the driving rod is movably arranged in the inner body and is used for axially reciprocating; a counting ring for displaying the quantitative injection times of the injection pen; the push rod is arranged in the driving rod and is used for pushing the rubber plug of the medicine bottle forwards in a fixed stroke so as to realize quantitative injection; an injection button for applying a force to the drive rod; the button cover is arranged at the rear end of the injection button and is used for covering the injection button; the pen refill holder is used for accommodating the medicine bottle, and the end part of the pen refill holder is connected with the inner body; when the injection button is pushed forward once, the driving rod and the push rod can be pushed to move forward for a fixed stroke, and the counting ring can be driven to rotate radially when the driving rod moves forward so as to record the quantitative injection times. The injection pen can realize accurate dose injection, has light weight and simple operation, and can be popularized and used.

Description

Manual operation fixed dose multiple use's brake mechanism

Technical Field

The utility model relates to the technical field of injection equipment, in particular to a braking mechanism for manually operating fixed dose for multiple use.

Background

In the prior art, most of the fixed dose injectors available on the market comprise a locking means for locking the actuator knob in a depressed position, an activation button for releasing the actuator button and a dose knob for setting a specified dose. The disadvantage of this fixed dose syringe is that the dose must be set and then manually injected by pushing the actuator button until it stops. In case of an emergency or in case of an inexperienced user operation, the injection may be interrupted halfway and the button may be unintentionally released. If the button is pressed again, i.e. in case of an unadjusted dose, a new dose previously set will be started, which will result in the patient receiving an excessive dose.

There is therefore a need for an arrangement which enables a safe and simple injection operation by inexperienced users and in emergency situations, i.e. an arrangement for administering a predetermined dose, such that the administration of a previously initiated dose of medicament must be completed completely before the administration of a subsequent predetermined dose can be initiated.

In addition, syringes having similar uses are currently available on the market, as follows:

(1) Injection device with mechanical locking mechanism

Comprising a real-time display for displaying the amount of outputtable substance still contained in the injection device or for displaying the amount of substance that has been output from the injection device, a mechanical locking mechanism, a screw guide and a jaw locking, as well as an injection device with a screw and/or a real-time display and/or a mechanical locking mechanism and/or a screw guide and/or a jaw locking.

In order to set the amount of substance to be output at the injection device, a setting movement is performed at the setting element, typically at a dose setting button or a dose setting ring, by a rotation of the dose setting element, wherein the angle of rotation defines the amount of substance to be output from the injection device following the next injection procedure. In injection devices that output a fixed, preset amount of substance, the so-called fixed dose pens, a setting movement is performed in order to pull the pen up in order to output a preset dose.

(2) Medication dispensing apparatus with sub-dose prevention

A medication dispensing apparatus for dispensing and delivering a preset dose of a fluid product, comprising: a housing; a dosing element movable relative to the housing between a start position and a dosing position; a drive system coupled to the dosing element operable to turn on or perform a dispensing operation; a sub-dose prevention system, which prevents or prevents dispensing operation of the drive train when the dosing element does not reach the dosing position, and which allows or unlocks dispensing operation of the drive train when or after the dosing element reaches the dosing position.

(3) Drug supply device

It is intuitive and safe to use, reliable, and it does not allow for the administration of a subsequent dose before a previous started dose is fully delivered. It comprises the following steps: a body having an outer housing and an inner housing, and having a proximal end and an opposite distal end; a cartridge configured with a drug to be supplied within the inner housing, the cartridge comprising an opening for expelling the drug and a plunger head movable within the container; a threaded plunger rod configured to be movable within the body in a longitudinal direction and in contact with the movable plunger head; manually operated pushing means movable in a longitudinal direction and operable to move the plunger rod towards the movable plunger head, thereby expelling medicament through the opening; spring means for biasing the biasing means towards the distal end of the device; a first driver and a second driver for transforming a substantially linear movement of the pushing means into a rotational movement of the plunger rod, wherein the transforming means comprises a first set of protruding structures arranged on the first driver in combination with a set of tilting lugs arranged on the second driver rotatably locked to the plunger rod, wherein the device comprises a movable release member with a guiding member adapted to interact with a guiding frame arranged on an outer circumferential surface of the manually operated pushing means, wherein the guiding frame is configured to prevent a subsequent dose from being fed before a previous started dose is completely administered.

From the above analysis of the prior art products, it is known that the existing injection devices have mainly the following drawbacks: the number of parts is large, the manufacturing process is complex, and the price is high; the operation is complex, some require pulling up the key to reset, and some require additionally sleeving a pen cap for resetting.

In summary, how to provide an injection device capable of realizing accurate dose injection and having light weight and easy operation is a problem to be solved by those skilled in the art.

Disclosure of Invention

Therefore, the utility model aims to provide a brake mechanism for manually operating fixed dose for multiple use, which can realize accurate dose injection, has light weight and simple operation, and can be popularized and used.

In order to achieve the above object, the present utility model provides the following technical solutions:

a manually operated fixed dose multiple use brake mechanism comprising:

a rear body, which is a rear half main part of the injection pen, and serves as a grip portion;

an inner body fixedly arranged in the rear body;

the driving rod is movably arranged in the inner body and is used for axially reciprocating;

the counting ring is sleeved on the periphery of the driving rod and used for displaying the quantitative injection times of the injection pen;

the push rod is arranged in the driving rod and is used for pushing the rubber plug of the medicine bottle forwards in a fixed stroke so as to realize quantitative injection;

an injection button for applying a force to the drive rod;

the button cover is arranged at the rear end of the injection button and is used for covering the injection button;

the refill holder is used for accommodating the medicine bottle, and the end part of the refill holder is connected with the inner body;

when the injection button is pushed forward once, the driving rod and the push rod can be pushed to move forward for a fixed stroke, and the counting ring can be driven to rotate radially when the driving rod moves forward so as to record the quantitative injection times.

Preferably, protruding rib positions are symmetrically arranged on the inner side of the front end of the rear body, and the inner body is provided with a spring sheet and a protrusion which are clamped with the protruding rib positions so as to fix the radial and axial positions of the inner body;

the back body's rear end outside is equipped with first window, second window and shielding piece, first window is used for showing count printing on the count ring, the second window is used for showing pull-up printing and lower impression on the injection button, shielding piece is used for shielding being close to the rear end pull-up printing.

Preferably, the front end of the driving rod is symmetrically provided with grooves, and the inner side of the front end of the inner body is symmetrically provided with inner side ribs for being embedded into the grooves so as to limit the radial rotation of the driving rod.

Preferably, the rear end of the inner body is symmetrically provided with claw notches, and the claw notches are used for axially positioning the counting ring;

the periphery of the driving rod is symmetrically provided with a first rib position and a second rib position, when the driving rod axially reciprocates, the first rib position and the second rib position can be respectively embedded into the inner edge rib position of the counting ring, and the tail end of the inner edge rib position is an inclined plane so as to guide the second rib position.

Preferably, the second rib is engaged with the symmetrical notch of the key cover so as to limit the axial displacement and radial rotation of one end of the key cover;

the tail end claw of the driving rod is engaged with the window of the key cover so as to limit the axial displacement of the other end of the key cover.

Preferably, the unidirectional tooth rows positioned at two sides of the push rod are respectively engaged with the symmetrical unidirectional spring arms of the inner body and the unidirectional spring pieces of the driving rod, so that the push rod can axially move unidirectionally;

the front end of the inner body is internally provided with a cross notch for limiting the radial rotation of the push rod.

Preferably, the outer periphery of the injection button is provided with an anti-slip symmetrical flange;

the injection button is internally provided with an inner flange which is matched with the hook claw of the button cover so as to fix the axial position of the button cover in the injection button.

Preferably, positioning notches are symmetrically arranged on two sides of the inner flange, and the positioning notches are engaged with the positioning ribs of the button cover so as to limit the button cover to radially rotate in the injection button.

Preferably, one end of the pen refill rack is provided with a disposable needle through threads, the other end of the pen refill rack is symmetrically provided with fixed windows, and the fixed windows are clamped and fixed with the claw of the inner body;

the periphery symmetry of refill frame is equipped with oval window, oval window is used for observing the service behavior of medicine bottle.

Preferably, the pen further comprises a pen cap for covering or opening the pen refill holder, wherein a pen clip for facilitating the carrying of a user is arranged on the outer side of the pen cap;

the inner side of the pen cap is symmetrically provided with inner side bosses which are matched with the annular grooves of the pen refill holder.

When the braking mechanism for manually operating the fixed-dose multiple use provided by the utility model is used, an operator can hold the rear body and push the injection button forwards, and the injection button can apply a downward pressure to the driving rod so as to enable the driving rod and the push rod to synchronously push the rubber plug of the medicine bottle forwards in a fixed stroke to realize quantitative injection. Meanwhile, when the driving rod moves forward, the counting ring can be driven to rotate radially so as to record the quantitative injection times, the injection times can be conveniently obtained by an operator, and the product of the injection times and the single injection dosage is the corresponding injection total quantity, so that the operator can control the dosage more effectively. The device adopts an axial driving design, can provide forward kinetic energy for the push rod by pushing the injection button forward, and the counting ring can display the current quantitative injection times, namely, an operator can perform accurate dose injection by one hand, and the injection pen has light weight and simple operation and can be popularized and used.

In summary, the manual operation fixed dose multi-use braking mechanism provided by the utility model can realize accurate dose injection, and the injection pen has the advantages of light weight, simple operation and popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a manually operated fixed dose multiple use brake mechanism provided by the present utility model;

FIG. 2 is an external view of a manually operated fixed dose multiple use brake mechanism;

FIG. 3 is a front view of a manually operated fixed dose multiple use brake mechanism;

FIG. 4 is a schematic view of the device when the injection button is pulled up;

FIG. 5 is a schematic view of the device when the injection button is depressed;

FIG. 6 is a schematic view of the injection button in the initial position and after injection;

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a schematic view of the counting ring of FIG. 7;

FIG. 9 is a schematic view of the injection button in a ready-to-inject position;

FIG. 10 is a perspective view of FIG. 9;

FIG. 11 is a schematic diagram of the key cover of FIG. 10;

FIG. 12 is a schematic view of the counting ring of FIG. 10;

FIG. 13 is an assembled schematic view of the push rod, drive rod and inner body;

FIG. 14 is another exploded view of a manually operated fixed dose multiple use brake mechanism;

FIG. 15 is an assembled schematic view of FIG. 14;

FIG. 16 is a schematic view of the structure of the rear body;

FIG. 17 is an internal schematic view of the rear body;

FIG. 18 is an assembled schematic view of the rear body, the inner body, the drive rod, and the injection button;

FIG. 19 is a schematic view of the structure of the inner body;

FIG. 20 is an end schematic view of FIG. 19;

FIG. 21 is an internal schematic view of the inner body;

FIG. 22 is an assembled schematic view of the rear body, inner body, drive rod, counter ring, push rod, and injection button;

FIG. 23 is an enlarged view of a portion of FIG. 22;

FIG. 24 is a schematic view of a counting ring;

FIG. 25 is a schematic view of the structure of the driving rod;

FIG. 26 is a schematic view of the assembly of the inner body, drive rod and counting ring;

FIG. 27 is an assembled schematic view of the inner body, drive rod, push rod and key cover;

FIG. 28 is a schematic view of a push rod;

FIG. 29 is a perspective view of a manually operated fixed dose multiple use brake mechanism;

FIG. 30 is a schematic view of an injection button;

FIG. 31 is a schematic view of a key cover;

FIG. 32 is a schematic view of an assembly of an injection button and button cover;

FIG. 33 is another schematic view of an injection button and button cover assembly;

fig. 34 is a schematic structural view of the cartridge holder;

FIG. 35 is a schematic view of the structure of the cap;

fig. 36 is an assembled schematic view of the cartridge holder, cap, push rod, and inner body.

In fig. 1-36:

1 is a rear body, 1.1 is a protruding rib position, 1.2 is a second window, 1.3 is a first window, 1.4 is a shielding piece, 2 is an inner body, 2.1 is a hook jaw notch, 2.2 is an elastic sheet, 2.3 is a protrusion, 2.4 is a hook jaw, 2.5 is an inner rib position, 2.6 is a symmetrical one-way elastic arm, 2.7 is a cross notch, 3 is a counting ring, 3.1 is a counting printing, 3.2 is an inner edge rib position, 3.3 is an inclined plane, 3.4 is a counting notch, 4 is a driving rod, 4.1 is a first rib position, 4.2 is a groove, 4.3 is a one-way elastic sheet, 4.4 is a second rib position 4.5 is a tail end claw, 5 is a push rod, 5.1 is a unidirectional tooth row, 6 is an injection button, 6.1 is a symmetrical flange, 6.2 is a pull-up printing, 6.3 is a push-down printing, 6.4 is a positioning notch, 6.5 is an inner flange, 7 is a button cover, 7.1 is a window, 7.2 is a claw, 7.3 is a symmetrical notch, 7.4 is a positioning rib position, 8 is a refill holder, 8.1 is an oval window, 8.2 is an annular groove, 8.3 is a fixed window, 8.4 is a screw thread, 9 is a pen cap, 9.1 is a pen clip, 9.2 is an inner boss and 10 is a medicine bottle.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The core of the utility model is to provide a manual operation fixed dose repeated use braking mechanism, which can realize accurate dose injection, and the injection pen has light weight, simple operation and popularization and application.

Please refer to fig. 1 to 36.

The present embodiment provides a manually operated fixed dose multiple use brake mechanism comprising:

a rear body 1, which is a rear half main part of the injection pen, the rear body 1 serving as a grip portion;

an inner body 2 fixedly provided in the rear body 1;

the driving rod 4 is movably arranged in the inner body 2 and is used for axially reciprocating;

a counting ring 3 which is sleeved on the periphery of the driving rod 4 and used for displaying the quantitative injection times of the injection pen;

a push rod 5 which is arranged in the driving rod 4 and is used for pushing the rubber plug of the medicine bottle 10 forwards in a fixed stroke so as to realize quantitative injection;

an injection button 6 for applying a force to the drive rod 4;

a key cover 7 provided at the rear end of the injection key 6 for closing the injection key 6;

a cartridge holder 8 for accommodating a medicine bottle 10, and an end of the cartridge holder 8 is connected to the inner body 2;

when the injection button 6 is pushed forward once, the driving rod 4 and the push rod 5 can be pushed to move forward for a fixed stroke, and the counting ring 3 can be driven to rotate radially when the driving rod 4 moves forward so as to record the quantitative injection times.

It should be noted that the parts used in the injection pen provided by the utility model can be made of various different plastics (ABS, POM, PC, stainless steel springs, etc.), and can also have different specifications and structures. The front half part of the pen body of the device can be used for accommodating a prefilled bottle with a needle, a clamp type bottle or a double-chamber type injector container, and a driving part in the rear body 1 pushes a rubber plug of the medicine bottle 10 through axial displacement of the push rod 5, so that medicine liquid is discharged through a stainless steel needle, and quantitative injection operation of an injection pen is realized.

When the braking mechanism for manually operating the fixed dose multiple use provided by the utility model is used, an operator can hold the rear body 1 and push the injection key 6 forwards, and the injection key 6 can apply a downward pressure to the driving rod 4 so as to enable the driving rod 4 and the push rod 5 to synchronously push the rubber stopper of the medicine bottle 10 forwards in a fixed stroke to realize quantitative injection. Meanwhile, when the driving rod 4 moves forward, the counting ring 3 can be driven to rotate radially to record the quantitative injection times, so that an operator can conveniently acquire the injection times, the product of the injection times and the single injection dosage is the corresponding injection total amount, and the operator can more effectively control the dosage. The device adopts the design of axial driving, can provide forward kinetic energy for the push rod 5 only by pushing the injection button 6 forward, and the counting ring 3 can display the current quantitative injection times, namely, an operator can perform accurate dose injection by one hand, and the injection pen has light weight and simple operation and can be popularized and used.

In summary, the manual operation fixed dose multi-use braking mechanism provided by the utility model can realize accurate dose injection, and the injection pen has the advantages of light weight, simple operation and popularization and application.

On the basis of the above embodiment, preferably, the inner side of the front end of the rear body 1 is symmetrically provided with a protruding rib position 1.1, and the inner body 2 is provided with a spring piece 2.2 and a protrusion 2.3 which are clamped with the protruding rib position 1.1 so as to fix the radial and axial positions of the inner body 2; the rear end outside of back body 1 is equipped with first window 1.3, second window 1.2 and shielding piece 1.4, and first window 1.3 is used for showing count printing 3.1 on the count ring 3, and second window 1.2 is used for showing the pull-up printing 6.2 and the push-down printing 6.3 on the injection button 6, and shielding piece 1.4 is used for shielding the pull-up printing 6.2 that is close to the rear end.

It should be noted that, the elastic piece 2.2 and the protrusion 2.3 of the inner body 2 are both combined with the protruding rib 1.1 of the rear body 1 to fix the axial position of the inner body 2 and limit the inner body 2 from rotating in the rear body 1.

It should be noted that, when the rear body 1 is used, the rear body 1 can be used as a main holding part of an injection pen, and the inner edge of the front end of the rear body 1 is symmetrically provided with protruding ribs 1.1 for fixing the radial and axial positions of the inner body 2. The first window 1.3 is used for displaying the counting print 3.1 on the counting ring 3, and the second window 1.2 is used for displaying the pull-up print 6.2 and the push-down print 6.3 on the injection button 6 to present the current state of the injection pen. In addition, since the pull-up print 6.2 is located above the lower press print 6.3, the shielding member 1.4 is closer to the pull-up print 6.2, so that the pull-up print 6.2 can be effectively shielded, and the pull-up print 6.2 is not seen by a user in preparation for injection, and thus erroneous judgment is avoided.

Preferably, the front end of the driving rod 4 is symmetrically provided with grooves 4.2, and the inner side of the front end of the inner body 2 is symmetrically provided with inner side ribs 2.5 for being embedded into the grooves 4.2 so as to limit the radial rotation of the driving rod 4. That is, the inner rib 2.5 measured in the inner body 2 can be embedded into the groove 4.2 of the driving rod 4 to limit the radial rotation of the driving rod 4, so that the driving rod 4 can only axially move in the inner body 2.

On the basis of the embodiment, preferably, the rear end of the inner body 2 is symmetrically provided with claw notches 2.1, and the claw notches 2.1 are used for axially positioning the counting ring 3; the outer periphery of the driving rod 4 is symmetrically provided with a first rib position 4.1 and a second rib position 4.4, and when the driving rod 4 axially reciprocates, the first rib position 4.1 and the second rib position 4.4 can be respectively embedded into an inner edge rib position 3.2 of the counting ring 3, and the tail end of the inner edge rib position 3.2 is an inclined plane 3.3 so as to guide the second rib position 4.4.

It should be noted that, the inner body 2 is a fixed part arranged in the rear body 1, and the rear end of the inner body 2 is symmetrically provided with a claw notch 2.1 to provide an axial positioning position of the counting ring 3, so that the counting ring 3 can radially rotate in the claw notch 2.1. And the count printing 3.1 displays the remaining times through the first window 1.3 of the rear body 1. When the driving rod 4 is axially reciprocated, the first rib 4.1 and the second rib 4.4 are respectively embedded into the inner rib 3.2 of the counting ring 3 at the distal end and the proximal end, thereby radially rotating the counting ring 3. The counting gap 3.4 of the counting ring 3 is a feature for providing a print positioning. The inclined surface 3.3 at the end of the inner rim rib 3.2 serves to provide a guiding function for the second rib 4.4 of the drive rod 4.

Preferably, the second rib 4.4 is matched with the symmetrical notch 7.3 of the key cover 7 to limit the axial displacement and radial rotation of one end of the key cover 7; the end finger 4.5 of the driving rod 4 engages with the window 7.1 of the key cover 7 to limit the axial displacement of the other end of the key cover 7.

The drive rod 4 is a member movable inside the injection pen, and is capable of axial reciprocation only in the inner body 2. The axial movement range of the driving rod 4 is limited by the scale ring 3 and the inner body 2. The second rib 4.4 is matched with the symmetrical notch 7.3 of the key cover 7, so that the radial rotation and axial displacement of the key cover 7 are limited. The end fingers 4.5 engage with the windows 7.1 of the key cover 7 to limit the amount of axial displacement of the other end of the key cover 7. When the first rib position 4.1 is propped against the bottom surface of the counting ring 3, the axial movement displacement of the driving rod 4 can be effectively limited, and when the first rib position 4.1 is propped against the modeling of the inner body 2, the axial movement displacement of the other side of the driving rod 4 can be effectively limited.

Preferably, the unidirectional tooth rows 5.1 positioned at two sides of the push rod 5 are respectively engaged with the symmetrical unidirectional spring arms 2.6 of the inner body 2 and the unidirectional spring pieces 4.3 of the driving rod 4, so that the push rod 5 moves unidirectionally and axially; the front end of the inner body 2 is internally provided with a cross notch 2.7 for limiting the radial rotation of the push rod 5.

The unidirectional spring 4.3 at the front end of the driving rod 4 abuts against the unidirectional tooth row 5.1 of the push rod 5, so that the push rod 5 can only move along a specific axial direction in the driving rod 4. The symmetrical unidirectional spring arms 2.6 at the front end of the inner body 2 support against the unidirectional tooth row 5.1 of the push rod 5 to limit the push rod 5 to axially move only towards the fixed direction in the inner body 2, so that medicament backflow caused by backward movement of the push rod 5 is avoided, and further the dosage accuracy can be improved. The cross notch 2.7 can effectively limit the radial rotation of the push rod 5, and ensure that the push rod 5 only moves axially.

Preferably, the outer periphery of the injection button 6 is provided with an anti-slip symmetrical flange 6.1; the injection button 6 is provided with an inner flange 6.5 which is engaged with the claw 7.2 of the button cover 7 to fix the axial position of the button cover 7 in the injection button 6.

It should be noted that the symmetrical flange 6.1 has a slip-preventing effect, so that the user can pull out the injection button 6 quickly and easily. The button cover 7 is a fixing piece arranged at the rear end of the injection button 6. The catch 7.2 engages with the inner flange 6.5 of the injection button 6 to fix the axial position of the button cover 7 within the injection button 6.

On the basis of the above embodiment, it is preferable that the two sides of the inner flange 6.5 are symmetrically provided with positioning notches 6.4, and the positioning notches 6.4 are engaged with the positioning ribs 7.4 of the button cover 7 to limit the button cover 7 from rotating radially in the injection button 6.

It should be noted that the positioning ribs 7.4 are engaged with the positioning notches 6.4 symmetrically arranged on both sides of the inner flange 6.5, so as to limit the radial rotation of the button cover 7 in the injection button 6. The second rib 4.4 is matched with the symmetrical notch 7.3 of the key cover 7, so that the radial rotation and axial displacement of the key cover 7 are limited. Moreover, the inner flange 6.5 is engaged with the hook claw 7.2 of the button cover 7 to fix the axial position of the button cover 7 in the injection button 6, and the positioning notches 6.4 symmetrically arranged on two sides of the inner flange 6.5 are engaged with the positioning rib positions 7.4 of the button cover 7 to limit the button cover 7 to radially rotate in the injection button 6.

Preferably, one end of the pen refill holder 8 is provided with a disposable needle through a thread 8.4, the other end of the pen refill holder is symmetrically provided with a fixed window 8.3, and the fixed window 8.3 is clamped and fixed with the claw 2.4 of the inner body 2; the periphery of the pen refill holder 8 is symmetrically provided with an elliptical window 8.1, and the elliptical window 8.1 is used for observing the use condition of the medicine bottle 10. The hook claw 2.4 is buckled with the fixed window 8.3 of the pen core frame 8, so that the position of the pen core frame 8 is effectively fixed.

Preferably, the pen also comprises a pen cap 9 for covering or opening the pen refill holder 8, and a pen clip 9.1 which is convenient for a user to carry is arranged on the outer side of the pen cap 9; the inner side of the pen cap 9 is symmetrically provided with inner side bosses 9.2 which are matched with the annular grooves 8.2 of the pen refill holder 8.

The annular groove 8.2 is used to fix the inner boss 9.2 of the cap 9 to the pen core holder 8, and the cap 9 is a loose fitting part connected to the pen core holder 8, that is, the user can insert and withdraw the cap 9. The pen holder 9.1 is intended to be carried by a user, while the inner boss 9.2 engages with the annular groove 8.2 in order to fix the pen cap 9 in the axial position of the cartridge holder 8.

The device adopts the design of axial driving, presses the injection button 6 to provide the forward kinetic energy of the push rod 5, after the injection is finished, the injection button 6 is in a pressing state, the first window 1.3 is observed to display the number of times that the injection pen can effectively transfer the dose at present, and the injection operation can be performed again by pulling up the injection button 6. The device is different from like products in the current market in part structure and part matching, and the convenient operation design ensures that a user can more effectively control the dosage in operation and is convenient to use.

To further illustrate the method of using the manually operated fixed dose multiple use brake mechanism provided by the present utility model, it is illustrated below.

In the exemplary embodiment, the injection pen device comprises a first window 1.3 for knowing the number of uses remaining in the device and observing the position of the injection button 6 and the arrow pointing to a second window 1.2 for resolving how the next operation should be performed, as shown in fig. 2.

Before use, the injection button 6 is attached to the rear body 1, and the second window 1.2 displays the pull-up print 6.2 to prompt the user that the injection button 6 should be pulled up in the direction indicated by the arrow. When the injection button 6 is pulled up, the second window 1.2 will display a change, and the second window 1.2 will display a press-down print 6.3, at this time, the user may be prompted to press the injection button 6 in the direction of the arrow for performing the injection operation. When the injection button 6 is pressed, the second window 1.2 will show the change, and the second window 1.2 will show the pull-up print 6.2, and the push rod 5 will protrude with a fixed stroke to the front end to push the rubber stopper of the medicine bottle 10 to complete the injection, as shown in fig. 3-5.

In the exemplary embodiment, when the injection pen is in the initial state or the injection is completed, the second rib 4.4 of the driving rod 4 is engaged with the symmetrical notch 7.3 of the key cover 7, so that the radial rotation of the key cover 7 is limited, and the first rib 4.1 of the driving rod 4 is propped against the shape of the inner body 2. When the front end of the second rib 4.4 of the driving rod 4 is sunk into the inner rib of the counting ring 3 each time, the driving rod 4 can drive the counting ring 3 to make a radial rotation within a specific scale range, as shown in fig. 6-8.

In the exemplary embodiment, the injection button 6 of the injection pen, in the extracted or ready to inject state, the end finger 4.5 of the drive rod 4 engages the window 7.1 of the button cover 7 to force the drive rod 4 to move axially. The first rib 4.1 of the drive rod 4 will eventually abut against the edge of the counter ring 3 to stop the axial movement of the counter ring 3. The second rib 4.4 of the driving rod 4 and the symmetrical notch 7.3 of the button cover 7 can move axially, so that the injection button 6 can make a sound and feel like a buffer when being pulled up or pressed down. The front end of the first rib 4.1 of the driving rod 4 is sunk into the inner edge rib 3.2 of the counting ring 3, so that the counting ring 3 rotates about half a scale, and the radial rotation of the counting ring 3 is limited by the process, as shown in fig. 9-12.

In the exemplary embodiment, the injection pen transmits the state that the push rod 5 makes axial displacement by pressing the injection button 6, and when the driving rod 4 moves forward along with the injection button 6, the unidirectional elastic sheet 4.3 of the driving rod 4 pushes the push rod 5 forward against the unidirectional saw teeth 5.1 on two sides of the push rod 5. Since the inner body 2 is a fixing member, the unidirectional spring arm 2.6 of the inner body 2 allows the push rod 5 to axially move only to a single side (front side, for example, a side far away from the button cover 7), and prevents the push rod 5 from axially displacing to the opposite side (rear side, for example, a side near to the button cover 7), so as to prevent the elastic force of the rubber plug of the medicine bottle 10 from pushing the push rod 5 to the rear end, thereby improving the dosage accuracy. When the driving rod 4 is pulled back along with the injection button 6, the unidirectional tooth row 5.1 of the push rod 5 allows the unidirectional spring 4.3 of the driving rod 4 to retract by one grid, and the push rod 5 can not generate axial displacement due to the propped symmetrical unidirectional spring arms 2.6 of the inner body 2, so as to be ready for continuing the next injection, as shown in fig. 13.

It should be noted that, in the present document, the first rib position 4.1 and the second rib position 4.4, the first window 1.3, and the second window 1.2 are mentioned, where the first and the second are merely to distinguish the difference of the positions, and no sequential distinction is made.

It should be noted that the direction or positional relationship indicated by "inside and outside" or the like of the present utility model is based on the direction or positional relationship shown in the drawings, and is merely for simplicity of description and ease of understanding, and does not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. Any combination of all the embodiments provided in the present utility model is within the protection scope of the present utility model, and will not be described herein.

The manual fixed dose multiple use brake mechanism provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. A manually operated fixed dose multiple use brake mechanism comprising:

a rear body (1) which is a rear half main part of the injection pen, the rear body (1) being used as a holding part;

an inner body (2) fixedly arranged in the rear body (1);

the driving rod (4) is movably arranged in the inner body (2) and is used for axially reciprocating;

a counting ring (3) which is sleeved on the periphery of the driving rod (4) and used for displaying the quantitative injection times of the injection pen;

the push rod (5) is arranged in the driving rod (4) and is used for pushing the rubber plug of the medicine bottle (10) forwards in a fixed stroke so as to realize quantitative injection;

an injection button (6) for applying a force to the drive rod (4);

a button cover (7) which is arranged at the rear end of the injection button (6) and is used for covering the injection button (6);

a cartridge holder (8) for accommodating the medicine bottle (10), and an end of the cartridge holder (8) is connected to the inner body (2);

when the injection button (6) is pushed forward once, the driving rod (4) and the push rod (5) can be pushed to move forward for a fixed stroke, and when the driving rod (4) moves forward, the counting ring (3) can be driven to rotate radially so as to record the number of times of quantitative injection.

2. The manually operated fixed dose multiple use brake mechanism according to claim 1, wherein protruding ribs (1.1) are symmetrically arranged on the inner side of the front end of the rear body (1), and the inner body (2) is provided with a spring plate (2.2) and a protrusion (2.3) which are clamped with the protruding ribs (1.1) so as to fix the radial and axial positions of the inner body (2);

the utility model discloses a novel plastic injection button, including back body (1), back body, upper and lower button, back body (1), back body, back end outside is equipped with first window (1.3), second window (1.2) and shielding piece (1.4), first window (1.3) are used for showing count printing (3.1) on count ring (3), second window (1.2) are used for showing pull-up printing (6.2) and lower button (6.3) on injection button (6), shielding piece (1.4) are used for shielding be close to back end pull-up printing (6.2).

3. A manually operated fixed dose multiple use brake mechanism as claimed in claim 1, characterised in that the front end of the drive rod (4) is symmetrically provided with grooves (4.2), the inner side of the front end of the inner body (2) is symmetrically provided with inner ribs (2.5) for embedding into the grooves (4.2) to limit the radial rotation of the drive rod (4).

4. The manually operated fixed dose multiple use brake mechanism according to claim 1, characterized in that the rear end of the inner body (2) is symmetrically provided with a claw gap (2.1), the claw gap (2.1) being used for axially positioning the counting ring (3);

the periphery symmetry of actuating lever (4) is equipped with first muscle position (4.1) and second muscle position (4.4) when actuating lever (4) axial reciprocating motion, first muscle position (4.1) with second muscle position (4.4) can imbed respectively inner edge muscle position (3.2) of counting ring (3), the end at inner edge muscle position (3.2) is inclined plane (3.3), in order to right second muscle position (4.4) is led.

5. The manually operated fixed dose multiple use brake mechanism as claimed in claim 4, wherein said second rib (4.4) engages a symmetrical notch (7.3) of said key cap (7) to limit axial displacement and radial rotation of one end of said key cap (7);

the tail end claw (4.5) of the driving rod (4) is matched with the window (7.1) of the key cover (7) so as to limit the axial displacement of the other end of the key cover (7).

6. The manually operated fixed dose multiple use brake mechanism as claimed in any of claims 1 to 5, wherein the rows of unidirectional teeth (5.1) on both sides of the push rod (5) are engaged with symmetrical unidirectional spring arms (2.6) of the inner body (2) and unidirectional spring plates (4.3) of the drive rod (4), respectively, to cause unidirectional axial movement of the push rod (5);

the front end of the inner body (2) is internally provided with a cross notch (2.7) for limiting the radial rotation of the push rod (5).

7. A manually operated fixed dose multiple use brake mechanism as claimed in any of claims 1 to 5, characterised in that the outer periphery of the injection button (6) is provided with a non-slip symmetrical flange (6.1);

an inner flange (6.5) which is matched with the hook claw (7.2) of the button cover (7) is arranged in the injection button (6) so as to fix the axial position of the button cover (7) in the injection button (6).

8. The manually operated fixed dose multiple use brake mechanism as claimed in claim 7, characterized in that positioning notches (6.4) are symmetrically provided on both sides of said inner flange (6.5), said positioning notches (6.4) being engaged with positioning ribs (7.4) of said key cap (7) to limit radial rotation of said key cap (7) within said injection key (6).

9. A manually operated fixed dose multiple use brake mechanism as claimed in any of claims 1 to 5, characterised in that a disposable needle is mounted at one end of the cartridge holder (8) by means of a screw thread (8.4), a fixed window (8.3) is symmetrically provided at the other end, said fixed window (8.3) being snap-fitted with a claw (2.4) of the inner body (2);

the pen refill holder is characterized in that oval windows (8.1) are symmetrically arranged on the periphery of the pen refill holder (8), and the oval windows (8.1) are used for observing the use condition of the medicine bottle (10).

10. The manually operated fixed dose multiple use brake mechanism according to any of claims 1 to 5, further comprising a cap (9) for closing or opening the cartridge holder (8), the cap (9) being provided on the outside with a pen clip (9.1) for easy carrying by a user;

inner bosses (9.2) which are matched with the annular grooves (8.2) of the pen refill holder (8) are symmetrically arranged on the inner side of the pen cap (9).