CN212997801U

CN212997801U - Medicament pushing mechanism of automatic insulin injector

Info

Publication number: CN212997801U
Application number: CN202020464098.7U
Authority: CN
Inventors: 黄左宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-04-20
Anticipated expiration: 2030-04-02

Abstract

The utility model relates to an insulin automatic syringe's medicament push mechanism, it is including promoting storage cartridge case rubber seal slider's propulsion screw rod and motor, be equipped with at least two sets of worm gear drive mechanism between propulsion screw rod and the motor, and be equipped with magnetic material on a set of worm gear drive mechanism's the worm of being connected with the motor, arbitrary one side of worm is equipped with and is used for detecting the hall sensor that the worm rotated the number of turns according to magnetic material. The high-precision micro-transmission control is realized by utilizing the large reduction ratio of the double groups of worm wheels and worms, the propelling mechanism is formed by utilizing the driving nuts and the propelling screws, the insulin injection precision of the propelling mechanism can reach 0.01 unit dose, and the use requirement is met.

Description

Medicament pushing mechanism of automatic insulin injector

Technical Field

The utility model particularly relates to a medicament pushing mechanism of an automatic insulin syringe.

Background

Currently, insulin automatic injection is mainly an islet pump. The medicament pushing mechanism is a servo motor and a precise reduction gear set. Although the control accuracy is high, it is expensive. The price of an islet pump is tens of thousands of yuan, and the general salary level can only be forbidden.

SUMMERY OF THE UTILITY MODEL

To the deficiency that prior art exists, the utility model aims to provide an insulin automatic injection ware's medicament push mechanism.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the medicament pushing mechanism of the automatic insulin injector comprises a pushing screw rod and a motor, wherein the pushing screw rod can push a rubber sealing sliding block of a medicament storage barrel, at least two groups of worm and gear transmission mechanisms are arranged between the pushing screw rod and the motor, magnetic materials are arranged on worms of a group of worm and gear transmission mechanisms connected with the motor, and a Hall sensor used for detecting the number of turns of the worm according to the magnetic materials is arranged on any one side of each worm.

And a first worm gear transmission mechanism and a second worm gear transmission mechanism are arranged between the propelling screw and the motor and are in transmission fit with each other.

The first worm gear and worm transmission mechanism comprises a first worm gear meshed with a first worm and a first worm gear in linkage fit with a motor shaft of the motor.

The second worm gear and worm transmission mechanism comprises a second worm gear and a second worm which are in linkage fit with the sliding block, and the second worm is coaxially linked with the first worm gear.

The second worm is fixedly arranged at the axis of the first worm wheel and is fixedly connected with the first worm wheel.

The second worm gear is coaxially provided with a transmission nut in linkage fit with the second worm gear, the propelling screw rod and the transmission nut form thread fit, and the propelling screw rod is in linkage fit with the insulin syringe through the sliding block.

The transmission nut is fixedly arranged at the axis of the second worm wheel and penetrates through the second worm wheel.

The center of the second worm gear is provided with a through hole with internal threads, the propelling screw rod and the through hole form thread fit, and the propelling screw rod is in linkage fit with the insulin syringe through a sliding block.

And a rotation stopping piece for preventing the rotation of the propelling screw is arranged at the matching part of the sliding block and the propelling screw.

The utility model has the advantages that: the high-precision micro-transmission control is realized by utilizing the large reduction ratio of the double groups of worm wheels and worms, the propelling mechanism is formed by utilizing the driving nuts and the propelling screws, the insulin injection precision of the propelling mechanism can reach 0.01 unit dose, and the use requirement is met.

Drawings

Fig. 1 is a schematic view of the present invention.

Fig. 2 is a schematic sectional view of the slider according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an insulin automatic injector's medicament push mechanism, insulin injector include cartridge case 10 (notes the cartridge case provides the storage that is used for insulin manufacture factory, and the rubber seal piston has been installed to cartridge case one end, and the cartridge case is disposable 10, 11 in the picture are for the convenience of explaining the theory of operation, and non-patent content), can slide the rubber seal slider 11 of setting in the cartridge case, and motor 1, the slider rear end is equipped with the propulsion screw rod, be equipped with at least two sets of worm gear and worm transmission mechanism between propulsion screw rod and the motor, and be equipped with magnetic material 3 on a set of worm gear and worm transmission mechanism's the worm that is connected with the motor, arbitrary one side of worm is equipped with the hall sensor 4 that is used for detecting the worm according to magnetic material and rotates the number of turns.

The first worm gear and worm transmission mechanism comprises a first worm 2 which is in linkage fit with a motor shaft of the motor and a first worm wheel 5 which is meshed with a first worm gear.

The second worm gear and worm transmission mechanism comprises a second worm gear 7 and a second worm 6 which are in linkage fit with the sliding block, and the second worm and the first worm gear are coaxially arranged in a linkage mode.

The second worm wheel is coaxially provided with a transmission nut 8 which is in linkage fit with the second worm wheel, and the rear side of the sliding block is fixedly provided with a propelling screw rod which is in threaded connection with the transmission nut.

The center of the second worm gear is provided with a through hole with internal threads, and the rear side of the sliding block is fixedly provided with a propelling screw 9 in threaded connection with the through hole.

When the motor rotates, the first worm mounted on the motor shaft also rotates together. One end of the first worm is provided with a magnet, and the first worm rotates one circle to generate a Hall pulse. The microprocessor can record the number of turns of the motor. The first worm is meshed with the first worm wheel, the first worm rotates for one circle, and the first worm wheel rotates for one tooth. The first worm wheel and the second worm are coaxially connected, the first worm wheel rotates for one circle, and the second worm also rotates for one circle. The second worm is engaged with the second worm wheel, so that the second worm wheel also rotates by one tooth. The second gear shaft hole is provided with internal threads which are connected with the propelling screw rod, and the second worm wheel rotates for a circle to advance and retreat the propelling screw rod by a screw pitch. The pushing screw rod pushes the sliding block to inject the insulin.

The screw is characterized in that a rotation stopping piece 12 for preventing rotation is arranged on any side of the propelling screw, namely a groove is formed in any side of the propelling screw, the rotation stopping piece 12 is arranged in the groove and matched with the sliding block, and rotation of the transmission nut is guaranteed to be converted into linear movement of the propelling screw.

Calculating the medicament injection control precision: we set the reservoir to store 200 units of insulin and the slider to move 20 mm. The distance each dose unit slide is calculated to move is 0.1 mm. The pitch of the advancing screw is 0.5 mm and one revolution of the second worm gear is 5 unit doses. The second worm gear is 24 teeth and the first worm gear is 20 teeth. The gear ratio of 24 × 20=480 means that the motor rotates 480 turns and the second worm wheel rotates one turn. The injected dose for one revolution of the motor is 5/480=0.0104 dose units. The dosage control precision is equivalent to that of an inlet islet pump.

The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides an insulin automatic injection ware's medicament push mechanism which characterized in that: the drug storage cylinder rubber sealing device comprises a propelling screw and a motor, wherein the propelling screw can push a drug storage cylinder rubber sealing sliding block, at least two groups of worm and gear transmission mechanisms are arranged between the propelling screw and the motor, magnetic materials are arranged on worms of a group of worm and gear transmission mechanisms connected with the motor, and a Hall sensor used for detecting the number of turns of the worm in rotation according to the magnetic materials is arranged on any one side of the worm.

2. The mechanism of claim 1, wherein: and a first worm gear transmission mechanism and a second worm gear transmission mechanism are arranged between the propelling screw and the motor and are in transmission fit with each other.

3. The mechanism of claim 2, wherein: the first worm gear and worm transmission mechanism comprises a first worm gear meshed with a first worm and a first worm gear in linkage fit with a motor shaft of the motor.

4. A dose pushing mechanism of an insulin automatic injector according to claim 3, characterized in that: the second worm gear and worm transmission mechanism comprises a second worm gear and a second worm which are in linkage fit with the sliding block, and the second worm is coaxially linked with the first worm gear.

5. The mechanism of claim 4, wherein: the second worm is fixedly arranged at the axis of the first worm wheel and is fixedly connected with the first worm wheel.

6. The mechanism of claim 4, wherein: the second worm gear is coaxially provided with a transmission nut in linkage fit with the second worm gear, the propelling screw rod and the transmission nut form thread fit, and the propelling screw rod is in linkage fit with the insulin syringe through the sliding block.

7. The mechanism of claim 6, wherein: the transmission nut is fixedly arranged at the axis of the second worm wheel and penetrates through the second worm wheel.

8. The mechanism of claim 6, wherein: the center of the second worm gear is provided with a through hole with internal threads, the propelling screw rod and the through hole form thread fit, and the propelling screw rod is in linkage fit with the insulin syringe through a sliding block.

9. The mechanism of claim 1, wherein: and a rotation stopping piece for preventing the rotation of the propelling screw is arranged at the matching part of the sliding block and the propelling screw.