CN106581819B

CN106581819B - Injection device

Info

Publication number: CN106581819B
Application number: CN201611201103.XA
Authority: CN
Inventors: 尹丹华
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-22
Filing date: 2016-12-22
Publication date: 2022-12-06
Anticipated expiration: 2036-12-22
Also published as: CN106581819A

Abstract

The injection device provided by the embodiment of the invention comprises a shell, a scale ring, an injection amount adjusting ring, a push rod and an adjusting transmission sleeve, wherein when the injection device is used, an injection container is arranged at the output end of the shell, and the push rod is contacted with the acting point of the injection container; the injection amount adjusting ring is rotated to drive the scale ring and the adjusting transmission sleeve to slide upwards, the upward sliding distance kL (k is more than 1) of the scale ring is greater than the upward sliding distance L of the adjusting transmission sleeve, and the upward sliding distance of the transmission sleeve is the actual injection amount, so that more concentrated scales can be engraved on the scale ring, the precision is improved, the size of the numbers or/and letters engraved on the scale ring can be increased, and the use by the old is facilitated; when in injection, force is applied to the scale ring, the scale ring and the adjusting transmission sleeve can slide downwards, and the adjusting transmission sleeve can drive the push rod to slide downwards to move L, so that force is applied to the injection container, and the injection is completed.

Description

Injection device

Technical Field

The invention relates to the field of medical instruments, in particular to an injection device.

Background

Diabetics need to inject artificial insulin frequently to reduce fluctuations in glycemic index, which must be administered parenterally to function in the body. Currently, the most common way to administer artificial insulin to diabetic patients is by subcutaneous injection; hypodermic injections mostly use disposable or fixed dose syringes, but since the dose that a patient needs to inject depends on his blood glucose index, the dose for each injection is different and needs to be accurately adjusted before each injection. In addition, in the use of other non-liquid medicines, accurate quantitative use is sometimes required, such as external ointment and the like. Although injection devices capable of adjusting the dose are also available on the market, they have the problem of being cumbersome to operate or costly.

Accordingly, it is an urgent need to provide an injection device that can precisely adjust an injection dose, is easy to operate, and is low in cost.

Disclosure of Invention

In view of the above, it is desirable to provide an injection device capable of accurately adjusting an injection dose, and having convenient operation and low cost.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the embodiment of the invention provides an injection device, which comprises a shell, a scale ring, an injection amount adjusting ring, a push rod and an adjusting transmission sleeve, wherein the scale ring is arranged on the shell;

the shell comprises an output end connected with the injectate container and an injection end for injecting;

the scale ring penetrates through the shell, and a preset matching structure which is fixed with the inner wall of the shell in the circumferential direction and is not fixed in the axial direction is arranged on the outer surface of the scale ring; the injection quantity adjusting ring is arranged in the scale ring in a penetrating way, and the outer surface of the injection quantity adjusting ring and the inner wall of the scale ring are in a thread matching structure;

the adjusting transmission sleeve is arranged in the injection quantity adjusting ring in a penetrating manner, and the adjusting transmission sleeve is provided with a transmission part which rotates along with the rotation of the injection quantity adjusting ring; the injection end of the shell is provided with a separation part which is matched with and pushes the transmission part of the adjusting transmission sleeve to separate from the injection amount adjusting ring, and the adjusting transmission sleeve slides along with the sliding of the scale ring to the injection end of the shell;

one end of the push rod penetrates through the adjusting transmission sleeve, the other end of the push rod extends out of the output end of the shell, the outer surface of the push rod is in threaded connection with the inner wall of the adjusting transmission sleeve, and the output end of the shell is provided with a rotation stopping structure for limiting the push rod to rotate.

In the above scheme, the injection device further comprises an adjusting stabilizing ring, the adjusting stabilizing ring is sleeved on the adjusting transmission sleeve, and the adjusting stabilizing ring and the adjusting transmission sleeve are axially fixed; the end of the adjusting and stabilizing ring towards the injection end of the shell is in key connection with the inner wall of the injection amount adjusting ring, and the end of the adjusting and stabilizing ring towards the output end of the shell is in threaded connection with the inner wall of the shell.

In the above scheme, the scale ring is arranged on the inner wall of the shell, the outer surface of the scale ring is in key connection with the inner wall of the shell, and one end of the scale ring extends out of the injection end of the shell.

In the above scheme, the one end towards the shell output in the surface of adjusting the driving sleeve is provided with first elastic bulge, the output of shell is provided with the recess that corresponds with first elastic bulge and distribute along the axial.

In the above scheme, an opening is formed in the outer surface of the shell along the circumferential direction, and the opening is communicated with the inner cavity of the shell; the outer surface of the injection quantity adjusting ring is provided with a second bulge, and the second bulge passes through the opening of the shell.

In the above scheme, the circumference of the push rod is provided with at least one flat potential surface penetrating through the whole length, the output end of the shell is provided with a rotation stopping hole with a cross section shape matched with that of the push rod and capable of moving, and when the output end of the shell is provided with the injection container, the rotation stopping hole is completely fixed.

In the above scheme, an outer cylindrical gear is arranged on the outer side of one end, facing the injection end of the shell, of the adjusting transmission sleeve, an inner cylindrical gear matched with the outer cylindrical gear is arranged on the inner wall of the injection amount adjusting ring, and the injection amount adjusting ring transmits torque to the adjusting transmission sleeve through meshing of the outer cylindrical gear and the inner cylindrical gear.

In the above scheme, the adjusting transmission sleeve comprises an upper adjusting sleeve and a lower adjusting sleeve, the lower adjusting sleeve is arranged on the upper adjusting sleeve in a penetrating manner, and the lower adjusting sleeve rotates along with the rotation of the upper adjusting sleeve;

the upper adjusting sleeve is arranged on the inner wall of the injection amount adjusting ring in a penetrating mode, the outer cylindrical gear is arranged at one end, facing the injection end of the shell, of the upper adjusting sleeve, the first elastic bulge is arranged on the lower adjusting sleeve, and the lower adjusting sleeve is axially fixed with the adjusting stabilizing ring.

In the above scheme, the inner wall of the adjusting stabilizing ring is provided with a first annular elastic flange, and the outer circular surface of the lower adjusting sleeve is provided with a first annular groove matched with the first elastic flange.

In the scheme, one end of the outer cylindrical gear, which faces the injection end of the shell, is movably connected with a separating part, and the separating part is arranged on the inner wall of the shell; the separating part is provided with a third bulge, and an axial through groove for the third bulge to pass through is formed in the shell; an elastic object is arranged on the inner wall of the injection quantity adjusting ring, one end of the elastic object is connected to one end of the outer cylindrical gear facing the output end of the shell, and the other end of the elastic object is fixed.

In the scheme, the outer surface of the shell is sleeved with the positioning ring, and the positioning ring rotates along the circumferential direction of the shell without axially sliding; the outer surface of the positioning ring is provided with a spiral groove for the third protrusion to pass through.

In the above scheme, the outer circle surface of the shell is provided with an annular second elastic flange, and the inner wall of the positioning ring is provided with a second annular groove matched with the second elastic flange.

In the above scheme, the first elastic bulge comprises an elastic balance lug and an elastic support arm which are symmetrically arranged along the circumference of the outer surface of the lower adjusting sleeve, and triangular bulges are symmetrically arranged at the tail ends of the elastic support arms.

The injection device provided by the embodiment of the invention comprises a shell, a scale ring, an injection amount adjusting ring, a push rod and an adjusting transmission sleeve, wherein when the injection device is used, an injection container is arranged at the output end of the shell, and the push rod is contacted with the acting point of the injection container; the injection amount adjusting ring is rotated to drive the scale ring and the adjusting transmission sleeve to slide upwards, the upward sliding distance kL (k is more than 1) of the scale ring is greater than the upward sliding distance L of the adjusting transmission sleeve, and the upward sliding distance of the transmission sleeve is the actual injection amount, so that more concentrated scales can be engraved on the scale ring, the precision is improved, the size of numbers or/and letters engraved on the scale ring can be increased, and the injection amount adjusting ring is convenient for old people to use; at the moment, the adjusting stable ring can prevent the adjusting transmission sleeve from sliding randomly, so that the precision is improved; when in injection, force is applied to the scale ring, the scale ring and the adjusting transmission sleeve can slide downwards, and the adjusting transmission sleeve can drive the push rod to slide downwards for a distance L, so that force is applied to the injection container, and the injection is completed. In addition, the injection device of the embodiment of the invention is composed of mechanical parts with uncomplicated structures, so that the operation is convenient, and the cost can be greatly reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of an injection device according to an embodiment of the present invention;

FIG. 2 is a first schematic view of a housing in an injection device according to an embodiment of the present invention;

FIG. 3 is a second schematic view of a housing in an injection device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a scale ring in an injection device according to an embodiment of the present invention;

FIG. 5 is a schematic view of an injection quantity adjustment ring in an injection device according to an embodiment of the present invention;

FIG. 6 is a schematic view of an upper adjustment sleeve of an injection device according to an embodiment of the present invention;

FIG. 7 is a schematic view of a lower adjustment sleeve in an injection device according to an embodiment of the present invention;

FIG. 8 is a schematic view of a plunger in an injection device according to an embodiment of the present invention;

FIG. 9 is a schematic view of an adjustment stabilizing ring in an injection device in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of a positioning ring in an injection device according to an embodiment of the present invention;

FIG. 11 is a schematic view of a separating member in an injection device according to an embodiment of the invention;

fig. 12 is a schematic orthographic view of the lower end surface of the lower adjustment sleeve in the injection device according to the embodiment of the invention.

Detailed Description

The invention is further illustrated by the following figures and specific application examples.

For simplicity of presentation, the injection device and its components are described in the orientation shown in fig. 1, i.e. both above and below refer to the top and bottom in fig. 1.

The embodiment of the invention provides an injection device, as shown in fig. 1, comprising a shell 1, a scale ring 2, an injection amount adjusting ring 3, a push rod 5 and an adjusting transmission sleeve 6, wherein:

the housing 1 comprises an output end for connection to an injectate container and an injection end for administering an injection.

The output end of the housing 1 is provided with an external thread (not shown in the figures) for mounting an injectate container.

The scale ring 2 is arranged in the shell 1 in a penetrating mode, and a preset matching structure which is fixed in the circumferential direction of the inner wall of the shell 1 and is not fixed in the axial direction is arranged on the outer surface of the scale ring 2.

Here, the scale ring 2 is installed on the inner wall of the housing 1, and the outer surface of the scale ring 2 is keyed to the inner wall of the housing 1 and has one end protruding from the injection end of the housing 1. Because the scale ring 2 is connected with the inner wall key of the shell 1, the scale ring 2 can slide axially along the shell 1 but does not rotate along the circumferential direction.

As shown in fig. 2 to 4, a plurality of first splines 11 may be provided on the inner wall of the housing 1, and correspondingly, an equal number of first key grooves 21 corresponding to the first splines 11 are provided on the outer surface of the scale ring 2; the inner cavity of the shell 1 is a cylinder, and the outer surface of the corresponding scale ring 2 is cylindrical.

The injection amount adjusting ring 3 is arranged in the scale ring 2 in a penetrating mode, and the outer surface of the injection amount adjusting ring 3 and the inner wall of the scale ring 2 are of a thread matching structure.

As shown in fig. 1, the injection amount adjusting ring 3 is installed in the inner wall of the scale ring 2, and one end of the outer circumferential surface facing the injection end of the housing 1 is screw-coupled with the inner wall of the scale ring 2, the pitch is a first value, and the screw direction is a first screw direction.

As shown in fig. 1, 4 and 5, the inner cavity of the scale ring 2 is cylindrical, and the outer surface of the injection quantity adjusting ring 3 is also cylindrical; one end of the scale ring 2 extends out of the injection end of the shell 1, the end is a thrust applying part when a user injects, and a rubber sleeve or a part of an inner cavity close to the end on the end sleeve can be sealed, so that the stress area is increased, and the user can apply the thrust more easily.

And (3) marking or printing scale marks on the outer surface of the scale ring 2, wherein the scale marks gradually increase the scale value from top to bottom.

As shown in fig. 4 and 5, the injection quantity adjusting ring 3 is provided with a first external thread 31 on the outer surface thereof, and correspondingly, a first internal thread (not shown) is provided on the inner wall of the scale ring 2; further, the thread type of the first external thread 31 and the first internal thread is a transmission thread, i.e. the thread type is rectangular, trapezoidal or saw-tooth; because basically not atress, preferably rectangle, so transmission efficiency is high, and the frictional force is little. The inner cavity of the scale ring 2 is a cylinder, and the outer surface of the corresponding injection quantity adjusting ring 3 is cylindrical.

The adjusting transmission sleeve 6 is arranged in the injection quantity adjusting ring 3 in a penetrating way, and the adjusting transmission sleeve 6 is provided with a transmission part which rotates along with the rotation of the injection quantity adjusting ring 3; the injection end of the shell 1 is provided with a separation part which is matched with and pushes the transmission part of the adjusting transmission sleeve 6 to separate from the injection quantity adjusting ring 3, and the adjusting transmission sleeve 6 slides along with the sliding of the scale ring 2 to the injection end of the shell 1.

Here, the transmission part can be disengaged from or connected to the injection quantity adjusting ring 3 by means of the disengagement part, so that the adjustment gear sleeve 6 and the injection quantity adjusting ring 3 have two states: a first, connected state, in which the adjustment driving sleeve 6 rotates with the rotation of the injection quantity adjusting ring 3; in the second, disengaged state, the rotation of the injection quantity adjusting ring 3 is not transmitted to the adjusting gear sleeve 6.

The disengagement member can control the adjustment gear sleeve 6 and the injection quantity adjustment ring 3 to switch between a connected state and a disengaged state. There are several implementations of this, such as: the outer surface of the adjusting transmission sleeve 6 is connected with the inner wall of the injection quantity adjusting ring 3 through a gear, and the connection or the separation is realized by adjusting whether the gear is meshed or not; or the outer surface of the adjusting transmission sleeve 6 is provided with a first bulge, the inner wall of the injection quantity adjusting ring 3 is provided with a groove for the first bulge to pass through, and the connection or the separation is realized by whether the first bulge passes through the groove or not.

Here, one end of the outer surface of the adjusting transmission sleeve 6 facing the output end of the housing 1 is provided with a first elastic protrusion 622, and the output end of the housing 1 is provided with grooves 13 which correspond to the first elastic protrusion 622 and are distributed along the axial direction; since the first elastic projection 622 of the outer surface of the adjustment driving sleeve 6 is caught by the groove 13 of the housing 1, the adjustment driving sleeve 6 is rotated in the circumferential direction only when it is subjected to a sufficient circumferential rotational force; since the recesses 13 are axially distributed, the adjustment sleeve 6 can slide axially relative to the housing 1.

One end of the push rod 5 penetrates through the adjusting transmission sleeve 6, the other end of the push rod extends out of the output end of the shell 1, the outer surface of the push rod 5 is in threaded connection with the inner wall of the adjusting transmission sleeve 6, and the output end of the shell 1 is provided with a rotation stopping structure for limiting the push rod 5 to rotate; where the pitch of the thread is a second value and the thread direction is a second direction. The first value is greater than the second value, and the first rotation direction is equal to the second rotation direction.

Here, since the output end of the housing 1 is provided with the rotation stop structure for restricting the rotation of the push rod 5, the push rod 5 does not rotate in the circumferential direction with respect to the housing 1, but can slide in the axial direction with respect to the housing 1.

In the embodiment of the present invention, as shown in fig. 1 to 3, an opening 12 is formed in an outer surface of the housing 1 along a circumferential direction, and the opening 12 is communicated with an inner cavity of the housing 1; the injection quantity adjusting ring 3 has a second protrusion 32 formed on an outer surface thereof, and the second protrusion 32 passes through the opening 12 of the housing 1.

Here, a force in the circumferential direction may be applied to the second projection 32 on the surface of the housing 1, so that the injection quantity adjusting ring 3 may be rotated in the circumferential direction; however, since the second projection 32 is caught by the opening 12 in the circumferential direction, the injection quantity adjusting ring 3 does not slide axially. For ease of installation, the injection quantity adjusting ring 3 may be removable, for example: the second projection 32 is removable; the second projection 32 may be knurled.

The working principle of the injection device provided by the embodiment of the invention is as follows:

1. regulating the injection volume

(1) As shown in fig. 1, the injection device is in an initial state, an injectate container is installed at the output end of the housing 1, and the push rod 5 is required to be in contact with the impact point of the injectate container, namely, the injectate container can push out a medicament as long as the push rod 5 slides downwards;

(2) The transmission part of the adjusting transmission sleeve 6 is connected with the injection quantity adjusting ring 3 through the adjusting separation part, namely, the adjusting transmission sleeve 6 and the injection quantity adjusting ring 3 are set in a connected state, and the rotation of the injection quantity adjusting ring 3 drives the adjusting transmission sleeve 6 to rotate;

(3) Turning the injection quantity adjusting ring 3, which is denoted as a first turn, produces two effects:

firstly, as the scale ring 2 can axially slide along the shell 1 but does not rotate in the circumferential direction, the injection quantity adjusting ring 3 can rotate in the circumferential direction along the shell 1 but does not axially slide, and the injection quantity adjusting ring 3 is in threaded connection with the inner wall of the scale ring 2, the scale ring 2 can upwards slide relative to the shell 1, and the scale marks are arranged on the outer surface of the scale ring 2, a user can easily know the injection quantity;

secondly, the injection quantity adjusting ring 3 drives the adjusting transmission sleeve 6 to rotate, the outer surface of the push rod 5 is in threaded connection with the inner wall of the adjusting transmission sleeve 6, the push rod 5 is clamped by the rotation stopping structure and cannot rotate, and the push rod 5 is propped by an injection container and cannot slide downwards, so that the adjusting transmission sleeve 6 can slide upwards by L;

thirdly, as the first rotating direction is equal to the second rotating direction, the sliding directions of the visible scale ring 2 and the adjusting transmission sleeve 6 are consistent, namely, the two are upwards sliding; however, since the first value is greater than the second value, the upward sliding distance kL (k > 1) of the scale ring 2 is greater than the upward sliding distance L of the adjusting transmission sleeve 6, and the upward sliding distance of the adjusting transmission sleeve 6 is the injection amount; the scales on the scale ring 2 can be denser, so that the injection amount can be more accurately adjusted, and the numbers or/and characters marked on the scale ring 2 can be increased, so as to facilitate the use of patients with poor eyesight, such as the elderly.

2. Injection of drugs

(1) The transmission part of the adjusting transmission sleeve 6 is separated from the injection quantity adjusting ring 3 through the adjusting and separating part, namely, the adjusting transmission sleeve 6 and the injection quantity adjusting ring 3 are set in a separated state, and the rotation of the injection quantity adjusting ring 3 is not transmitted to the adjusting transmission sleeve 6;

(2) When downward force is applied to the scale ring 2, the scale ring 2 only slides downwards relative to the shell 1; because the outer surface of the injection quantity adjusting ring 3 is in threaded connection with the inner wall of the scale ring 2, and the injection quantity adjusting ring 3 can rotate along the circumferential direction of the shell 1 without sliding axially, the injection quantity adjusting ring 3 can only rotate along a second rotating direction opposite to the first rotating direction; because the adjusting transmission sleeve 6 is not subjected to the rotating force along the circumferential direction, the adjusting transmission sleeve 6 can only axially slide relative to the shell 1, the push rod 5 does not rotate along the circumferential direction, and then the push rod 5 can downwards slide L to apply pressure to the acting point of the injectate container to inject the medicament.

In the embodiment of the invention, the injection device further comprises an adjusting and stabilizing ring 7, the adjusting and stabilizing ring 7 is sleeved on the adjusting and driving sleeve 6, and the adjusting and stabilizing ring 7 and the adjusting and driving sleeve 6 are axially fixed; one end of the adjusting and stabilizing ring 7, which faces towards the injection end of the shell 1, is in key connection with the inner wall of the injection amount adjusting ring 3, and the other end of the adjusting and stabilizing ring, which faces towards the output end of the shell 1, is in threaded connection with the inner wall of the shell 1; the pitch of the thread is a second value and the thread direction is a second direction.

As shown in fig. 9, a plurality of second key grooves 71 may be formed on the outer surface of the adjustment stabilizing ring 7, and in correspondence with this, an equal number of second splines (not shown in the drawing) corresponding to the second key grooves 71 are formed on the inner wall of the injection quantity adjusting ring 3, and it can be seen that the rotation of the injection quantity adjusting ring 3 is transmitted to the adjustment stabilizing ring 7, so that the adjustment stabilizing ring 7 is rotated therewith. The outer surface of the adjusting and stabilizing ring 7 is cylindrical. The outer surface of the adjusting and stabilizing ring 7 is provided with a second external thread 72, and correspondingly, as shown in fig. 2 and 3, the inner wall of the housing 1 is provided with a second internal thread 14.

Here there is only one hole at the output end of the injection device through which the push rod 5 protrudes, enclosing the adjustment stabilizing ring 7 and the adjustment drive sleeve 6 within the cavity of the housing 1.

The function of the adjusting stabilizer ring 7 is:

1. in the step (3) of adjusting the injection amount, since the outer surface of the adjusting stabilizer ring 7 is in key connection with the inner wall of the injection amount adjusting ring 3, the adjusting stabilizer ring 7 also rotates, but since the outer surface of the adjusting stabilizer ring 7 is in threaded connection with the inner wall of the housing 1, the pitch is a second value, and the direction of rotation is a second direction of rotation, the adjusting stabilizer ring 7 slides upwards, and the sliding distance is also L; it can also be understood that, since the adjusting and stabilizing ring 7 and the adjusting and driving sleeve 6 are axially fixed, the upward sliding of the adjusting and stabilizing ring 7 will drive the adjusting and driving sleeve 6 to slide upward; at this time, the push rod 5 will not generate any force on the injectate container, so that the use safety is further ensured;

2. in the injection step (1), the adjusting stabilizing ring 7 can slide axially only under the action of the rotating force in the circumferential direction transmitted by the injection quantity adjusting ring 3; therefore, the adjusting and stabilizing ring 7 plays a role of stabilizing the adjusting and driving sleeve 6, namely, the adjusting and driving sleeve 6 is prevented from sliding downwards at will, and the accuracy is further improved;

3. in the injection step (2), the injection quantity adjusting ring 3 drives the adjusting stabilizing ring 7 to rotate along the second rotation direction, the adjusting stabilizing ring 7 slides downwards, and the adjusting driving sleeve 6 is driven to slide downwards L due to the fact that the adjusting stabilizing ring 7 is axially fixed with the adjusting driving sleeve 6, namely the adjusting stabilizing ring 7 applies downward force to the adjusting driving sleeve 6.

In the embodiment of the present invention, as shown in fig. 8, at least one flat surface 52 penetrating the entire length is arranged on the circumference of the push rod 5, and the rest is a third external thread 51; the output end of the housing 1 is provided with a rotation stopping hole which has a cross section shape matched with that of the push rod 5 and is movable, and when the output end of the housing 1 is provided with an injectate container, the rotation stopping hole is completely fixed.

Here, correspondingly, a third internal thread (not shown in the figures) is provided in the adjusting gear sleeve 6, which cooperates with the third external thread 51.

Further, there may be more than one flat surface 52, but too much reduces the area of the thread surface to facilitate the screwing motion, and in this embodiment there are two flat surfaces 52.

3. reduction of position

(1) After the injection is completed, the injectate container is removed from the output end of the housing 1;

(2) Because the rotation stopping hole can be moved, the push rod can be directly rotated and slides upwards to complete the reset of the refraction device.

In the embodiment of the present invention, as shown in fig. 5 and 6, an outer cylindrical gear 611 is disposed outside one end of the adjusting transmission sleeve 6 facing the injection end of the housing 1, an inner gear 33 matching with the outer cylindrical gear 611 is disposed on the inner wall of the injection amount adjusting ring 3, and the injection amount adjusting ring 3 transmits torque to the adjusting transmission sleeve 6 through the engagement of the outer cylindrical gear 611 and the inner cylindrical gear 33.

At this time, the connection or disconnection between the adjustment gear sleeve 6 and the injection amount adjusting ring 3 can be achieved by the engagement or disengagement of the outer cylindrical gear 611 and the inner circular gear 33.

In the embodiment of the present invention, as shown in fig. 1, 6 and 7, the adjusting transmission sleeve 6 includes an upper adjusting sleeve 61 and a lower adjusting sleeve 62, the lower adjusting sleeve 62 is inserted into the upper adjusting sleeve 61, and the lower adjusting sleeve 62 rotates along with the rotation of the upper adjusting sleeve 61.

The upper adjusting sleeve 61 is arranged on the inner wall of the injection amount adjusting ring 3 in a penetrating manner, the outer cylindrical gear 611 is arranged at one end of the upper adjusting sleeve 61 facing the injection end of the shell 1, the first elastic bulge 622 is arranged on the lower adjusting sleeve 62, and the lower adjusting sleeve 62 and the adjusting and stabilizing ring 7 are axially fixed.

Optionally, the outer surface of the push rod 5 and the inner wall of the lower adjusting sleeve 62 are in threaded connection.

Optionally, the lower adjustment sleeve 62 is keyed to the upper adjustment sleeve 61. The outer circumferential surface of the lower adjusting sleeve 62 is provided with third splines 621, and the inner wall of the upper adjusting sleeve 61 is provided with an equal number of third keyways 612 corresponding to the third splines 621.

Here, in the process of adjusting the injection quantity, it is necessary to maintain the meshed state between the outer cylindrical gear 611 and the inner cylindrical gear 33, and when the injection quantity adjusting ring 3 is rotated in the first direction, the upper and lower adjusting

sleeves

61 and 62 are rotated and the lower adjusting sleeve 62 is moved upward, since the lower adjusting sleeve 62 is inserted into the upper adjusting sleeve 61, thereby not affecting the meshed state between the outer cylindrical gear 611 and the inner cylindrical gear 33.

During the injection, the separation state between the outer cylindrical gear 611 and the inner cylindrical gear 33 needs to be maintained, the injection amount adjusting ring 3 rotates along the second direction to drive the adjusting transmission sleeve 6 to rotate, the lower adjusting sleeve 62 slides downwards, and the separation state between the outer cylindrical gear 611 and the inner cylindrical gear 33 is not affected because the lower adjusting sleeve 62 is arranged on the upper adjusting sleeve 61 in a penetrating manner.

In the embodiment of the invention, as shown in fig. 1 and 7, the inner wall of the adjusting and stabilizing ring 7 is provided with a first annular elastic flange, and the outer circumferential surface of the lower adjusting sleeve 62 is provided with a first annular groove 623 matched with the first elastic flange.

The axial clearance between the first annular groove 623 and the first elastic flange is small, so as to ensure the mutual axial fixation; it should be noted that the height of the first elastic flange protruding from the inner wall of the adjustment and stabilization ring 7 is limited, or it may not fit into the first annular groove 623 even if it is elastic.

In the embodiment of the present invention, as shown in fig. 1 and fig. 11, a separating member 8 is movably connected to one end of the outer cylindrical gear 611 facing the injection end of the housing 1, and the separating member 8 is installed on the inner wall of the housing 1; the separating component 8 is provided with a third protrusion 81, and an axial through groove 15 for the third protrusion 81 to pass through is arranged on the shell 1; an elastic object 9 is provided on the inner wall of the injection amount adjusting ring 3, one end of the elastic object 9 is connected to one end of the outer cylindrical gear 611 facing the output end of the housing 1, and the other end of the elastic object 9 is fixed.

As shown in fig. 1, the elastic member 9 may be a spring; as shown in fig. 11, the number of the third protrusions 81 may be two, and as shown in fig. 2 and 3, the number of the through grooves 15 is also two. In order to allow the push rod to smoothly slide upward during the adjustment of the injection amount, the separation member 8 must be axially hollow. The outer surface of the separating member 8 may be cylindrical.

By the cooperation of the separating member 8 and the elastic body 9, the engagement and the separation between the outer cylindrical gear 611 and the inner cylindrical gear 33 can be achieved. In order to achieve engagement and disengagement smoothly, the distance over which the disengagement member 8 slides axially must be greater than the thickness of the outer cylindrical gear 611. The engagement between the outer cylindrical gear 611 and the inner cylindrical gear 33 can be achieved by applying a downward force to the third projection 81, i.e., by pressing the separating member 8 downward; when an upward force is applied to the third protrusion 81, that is, the separating member 8 is lifted upward, the outer cylindrical gear 611 and the inner cylindrical gear 33 can be separated from each other by the elastic member 9.

In the embodiment of the present invention, as shown in fig. 1 and 10, a positioning ring 10 is sleeved on an outer surface of the housing 1, and the positioning ring 10 can rotate along the circumferential direction of the housing 1 without sliding axially; the outer surface of the positioning ring 10 is provided with a spiral groove 101 for the third protrusion 81 to pass through.

Here, since the third protrusion 81 is caught by the through groove 15, the separating member 8 can be made to axially slide when the positioning ring 10 is rotated, thereby achieving the engagement and disengagement between the outer cylindrical gear 611 and the inner cylindrical gear 33.

In the embodiment of the present invention, as shown in fig. 1 to 3, an annular second elastic flange 16 is disposed on the outer circumferential surface of the housing 1, and a second annular groove matching with the second elastic flange 16 is disposed on the inner wall of the positioning ring 10.

In an embodiment of the present invention, as shown in fig. 12, the first elastic protrusion 622 includes: the elastic balance lug 6223 and the elastic support arm 6222 are symmetrically arranged along the circumference of the outer surface of the lower adjusting sleeve 62, and the triangular protrusion 6221 is symmetrically arranged at the tail end of the elastic support arm 6222.

As shown in fig. 12, the number of the elastic balance protrusions 6223 and the number of the elastic support arms 6222 are two, each elastic balance protrusion 6223 is provided with two triangular protrusions 6221, and four triangular protrusions 6221 and two elastic balance protrusions 6223 are uniformly distributed on the circumference from the whole circumference; correspondingly, the cross-sectional shape of the groove 13 is a triangular internal gear.

The technical effect is that the injection quantity can be adjusted, obvious intermittent rotation feeling can be brought to a patient, namely, the patient can adjust a section of preset injection quantity, can feel dendenuded on the hand and can make a sound when adjusting the injection quantity, the patient can conveniently operate under the condition that the scale marks of the pushed objects are not seen clearly, and the vision of many diabetics can be greatly reduced; and the structure does not interfere the axial movement during pushing, and ensures the normal movement of the lower adjusting sleeve 62, namely the normal movement of the push rod 5.

Further, on the basis that the structure of the elastic support arm 6222 has a certain elasticity, the material of the adjusting transmission sleeve is also preferably a material with large elasticity, which is not described herein again.

In summary, the injection device is composed of mechanical parts, and the parts are simple in structure, so that the operation is simple, and the cost can be greatly reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. An injection device is characterized by comprising a shell, a scale ring, an injection amount adjusting ring, a push rod and an adjusting transmission sleeve;

the scale ring penetrates through the shell, and a preset matching structure which is fixed with the inner wall of the shell in the circumferential direction and is not fixed in the axial direction is arranged on the outer surface of the scale ring; the injection quantity adjusting ring penetrates through the scale ring, and the outer surface of the injection quantity adjusting ring and the inner wall of the scale ring are in a thread matching structure;

the adjusting transmission sleeve is arranged in the injection quantity adjusting ring in a penetrating manner, and is provided with a transmission part which rotates along with the rotation of the injection quantity adjusting ring; the injection end of the shell is provided with a separation part which is matched with and pushes the transmission part of the adjusting transmission sleeve to separate from the injection amount adjusting ring, and the adjusting transmission sleeve slides along with the sliding of the scale ring to the injection end of the shell;

one end of the push rod penetrates through the adjusting transmission sleeve, the other end of the push rod extends out of the output end of the shell, the outer surface of the push rod is in threaded connection with the inner wall of the adjusting transmission sleeve, and the output end of the shell is provided with a rotation stopping structure for limiting the push rod to rotate;

an opening along the circumferential direction is formed in the outer surface of the shell, and the opening is communicated with the inner cavity of the shell; the outer surface of the injection quantity adjusting ring is provided with a second bulge, and the second bulge passes through the opening of the shell;

the injection device further comprises an adjusting and stabilizing ring, the adjusting and stabilizing ring is sleeved on the adjusting transmission sleeve, and the adjusting and stabilizing ring and the adjusting transmission sleeve are axially fixed; one end of the adjusting stabilizing ring, which faces the injection end of the shell, is in key connection with the inner wall of the injection amount adjusting ring, and the other end of the adjusting stabilizing ring, which faces the output end of the shell, is in threaded connection with the inner wall of the shell;

an outer cylindrical gear is arranged on the outer side of one end, facing the injection end of the shell, of the adjusting transmission sleeve, an inner gear matched with the outer cylindrical gear is arranged on the inner wall of the injection amount adjusting ring, and the injection amount adjusting ring transmits torque to the adjusting transmission sleeve through the meshing of the outer cylindrical gear and the inner cylindrical gear;

one end of the outer cylindrical gear, which faces the injection end of the shell, is movably connected with a separation part, and the separation part is arranged on the inner wall of the shell; the separating part is provided with a third bulge, and an axial through groove for the third bulge to pass through is formed in the shell; an elastic object is arranged on the inner wall of the injection quantity adjusting ring, one end of the elastic object is connected to one end of the outer cylindrical gear facing the output end of the shell, and the other end of the elastic object is fixed.

2. An injection device according to claim 1, wherein the scale ring is mounted on an inner wall of the housing, the outer surface of the scale ring being keyed to the inner wall of the housing and one end extending from the injection end of the housing.

3. The injection unit as set forth in claim 1, wherein the outer surface of the adjusting gear sleeve is provided at an end thereof facing the output end of the housing with a first elastic projection, and the output end of the housing is provided with grooves corresponding to the first elastic projection and distributed in the axial direction.

4. The injector of claim 1, wherein the push rod has at least one substantially flat surface extending along the entire length of the push rod, and wherein the output end of the housing has a rotation stop hole having a cross-sectional shape adapted to the push rod and movable therein, the rotation stop hole being substantially fixed when the output end of the housing is engaged with the injectate container.

5. The injection device as set forth in claim 1, wherein the adjusting transmission sleeve comprises an upper adjusting sleeve and a lower adjusting sleeve, the lower adjusting sleeve is disposed on the upper adjusting sleeve, and the lower adjusting sleeve rotates with the rotation of the upper adjusting sleeve;

6. The injection device as claimed in claim 5, wherein the inner wall of the regulation stabilizing ring is provided with a first elastic flange in a ring shape, and the outer circumferential surface of the lower regulation sleeve is provided with a first annular groove matched with the first elastic flange.

7. The injection device as defined in claim 1, wherein a positioning ring is sleeved on an outer surface of the housing, and the positioning ring rotates in a circumferential direction of the housing without sliding in an axial direction; the outer surface of the positioning ring is provided with a spiral groove for the third protrusion to pass through.

8. The injection unit defined in claim 7, wherein the outer circumferential surface of the housing is provided with a second resilient annular flange and the inner wall of the retaining ring is provided with a second annular groove that mates with the second resilient flange.

9. The injection unit according to claim 5, wherein the first elastic protrusion comprises an elastic balance protrusion and an elastic arm symmetrically arranged along the circumference of the outer surface of the lower adjusting sleeve, and a triangular protrusion is symmetrically arranged at the end of the elastic arm.