CN213491140U

CN213491140U - Insulin pump two-section type injection driving rod structure

Info

Publication number: CN213491140U
Application number: CN202021970815.XU
Authority: CN
Inventors: 王永鑫; 王磊杰; 梁灏方; 高之鹏; 李丹丹; 王韶林
Original assignee: Phray Technology Co ltd
Current assignee: Phray Technology Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-06-22
Anticipated expiration: 2030-09-10

Abstract

The insulin pump two-section type injection driving rod structure comprises a primary telescopic transmission mechanism, a secondary telescopic transmission mechanism and an injection mechanism which are arranged inside a shell of the insulin pump; the second-stage telescopic transmission mechanism is arranged in the first-stage telescopic transmission mechanism and is in transmission connection with the first-stage telescopic transmission mechanism, and the injection mechanism is arranged at the upper end part of the second-stage telescopic transmission mechanism; the utility model adopts the design idea of two-stage driving telescopic rod structure (the primary telescopic transmission mechanism and the secondary telescopic transmission mechanism), under the premise of increasing the injection amount for one time, the whole volume of the insulin pump becomes more exquisite and is convenient to carry; by adopting the design method of the two-section type driving telescopic rod structure, the total telescopic length of the driving rod is longer than that of a single-section type driving rod, so that the grading precision of the stepping mechanism of the insulin pump can be improved (the number of rotation turns of the motor component is increased).

Description

Insulin pump two-section type injection driving rod structure

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to two segmentation injection actuating lever structures of insulin pump.

Background

The insulin pump is composed of an injection pump, a small syringe and an infusion tube connected with the small syringe, and is basically used for injecting insulin to the subcutaneous space of a patient according to the dosage required by a human body to keep the blood sugar stable throughout the day so as to achieve the aim of controlling diabetes. However, the injection driving rod of the existing insulin pump is generally of a single-rod structure, and on the premise of requiring a small volume of the insulin pump, the injection amount of insulin per time of the single-rod structure is very small, and through inquiry, some relevant patent documents are reported in the existing patent documents, and mainly include the following:

1. the utility model discloses a utility model patent of a publication number CN 108159530A "a actuating lever and motor integration assembly structure for insulin pump" belongs to medical instrument technical field. This patent insulin pump's actuating lever and motor integration assembly structure adopts integration assembly structure, and both form a whole on being fixed in same fixing base jointly, have guaranteed the concentricity of actuating lever and motor, make the actuating lever under the drive of motor, steady flexible, the direction is guaranteed always to the maximize, reduces the resistance, has prolonged actuating mechanism's life.

2. The utility model discloses a utility model patent of publication number CN 109529154A name "a novel multistage sinking section of thick bamboo formula insulin pump advancing mechanism" belongs to medical instrument technical field. This patent adopts the advancing mechanism of the heavy section of thick bamboo formula insulin pump of multistage, through setting up main guide rail, vice guide rail, main and vice guide bar, can replace traditional square guide slot direction to require higher phenomenon to equipment machining precision, can avoid adding when the precision is lower man-hour, then easily appear blocking phenomenon in the propulsion return process, causes the insulin pump trouble, and the infusion insulin fails.

The above two patent documents only solve the problems of effectiveness and structural life of the injection drive mechanism, and do not relate to the increase of the injection amount and the miniaturization of the insulin pump.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the weak point among the prior art, provide a compact structure, can increase the insulin pump two segmentation injection actuating lever structures of injection volume under the prerequisite that does not increase insulin pump volume.

In order to solve the technical problem, the utility model adopts the following technical scheme: the insulin pump two-section type injection driving rod structure comprises a primary telescopic transmission mechanism, a secondary telescopic transmission mechanism and an injection mechanism which are arranged inside a shell of the insulin pump; the second-stage telescopic transmission mechanism is arranged in the first-stage telescopic transmission mechanism and is in transmission connection with the first-stage telescopic transmission mechanism, and the injection mechanism is arranged at the upper end part of the second-stage telescopic transmission mechanism;

the shell comprises a bottom cover and an upper shell which are fastened into a whole, a fixed seat is arranged on the left side in the bottom cover, a positioning hole with an opening at the top is arranged on the fixed seat, a lower positioning ring used for limiting the outer part of the upper end of the primary telescopic transmission mechanism is arranged on the upper surface of the fixed seat, an upper positioning ring used for limiting the outer part of the lower end of the primary telescopic transmission mechanism is arranged on the left side of the inner wall of the upper shell, the upper positioning ring is positioned right above the lower positioning ring, and the; the lower end of the primary telescopic transmission mechanism is arranged on the fixed seat.

One-level telescopic transmission mechanism includes the drive ring gear, the one-level actuating lever, one-level lead screw and one-level dead lever, the fixed setting of one-level dead lever lower extreme is in the locating hole, one-level actuating lever and one-level lead screw are the cylinder structure, the upper end and the lower extreme of one-level actuating lever rotate respectively and are connected in last holding ring and lower holding ring, drive ring gear coaxial arrangement is on the excircle upper portion of one-level actuating lever, the interior circle upper portion of one-level actuating lever is equipped with the trapezoidal internal thread of a lesson one-level, the excircle of one-level lead screw is equipped with the trapezoidal external screw thread of.

The second-stage telescopic transmission mechanism comprises a second-stage lead screw, a second-stage fixed rod and a lead screw plug, the second-stage lead screw and the second-stage fixed rod are both of cylindrical structures, a second-stage trapezoidal external thread in threaded connection with a second-stage trapezoidal internal thread is arranged on the excircle of the second-stage lead screw, the inner circle of the second-stage fixed rod is sleeved outside the first-stage fixed rod in a sliding mode, a first guide groove is formed in the inner wall of the second-stage fixed rod along the axial direction, the upper end of the first guide groove is flush with the upper end of the second-stage fixed rod, a first guide key in sliding connection with the first guide groove is integrally arranged on the excircle of the upper end of the first-stage fixed rod, the inner circle of the second-stage lead screw is sleeved outside the second-stage fixed rod in a; the screw rod plug is fixedly arranged at the upper end part of the secondary screw rod.

The injection mechanism comprises an injection pen core, a pen core piston and an infusion pipeline, the injection pen core is vertically arranged on the upper portion of the left side in the upper shell, the pen core piston is sealed on the inner wall of the injection pen core in a sliding mode, the infusion pipeline is arranged at the upper end of the injection pen core and extends out of the upper shell, and the upper end of the screw rod plug is fixedly connected with the bottom face of the pen core piston.

The one-level trapezoidal internal thread on the upper portion of the inner circle of the one-level driving rod, the one-level trapezoidal external thread of the one-level screw rod, the two-level trapezoidal internal thread of the two-level screw rod are both in a trapezoidal thread structure, the thread pitches of all the threads are kept consistent, and the thread pitch of one-level trapezoidal external thread of the one-level screw rod at the lowest part is smaller than that of the one-level trapezoidal internal thread and is gradually reduced from top to bottom.

By adopting the technical scheme, the lower end of the first-level fixed rod is inserted into the positioning hole on the fixed seat and is fixedly connected with the fixed seat, so that relative sliding and relative rotation do not occur. The right side of the shell is provided with a motor gear meshed with the driving gear ring of the primary telescopic transmission mechanism and a motor component for driving the motor gear to rotate positively and negatively.

The utility model discloses a working process does: when the liquid medicine is injected, the motor component drives the motor gear to rotate, thereby driving the driving gear ring meshed with the motor gear to rotate, driving the gear ring to drive the primary driving rod to rotate, the first-stage screw rod meshed with the first-stage trapezoidal internal thread at the upper part of the inner circle of the first-stage driving rod and the second-stage telescopic transmission mechanism move upwards along the first-stage fixed rod together, the first guide groove at the inner wall of the second-stage fixed rod slides upwards along the first guide key integrally arranged at the outer circle at the upper end of the first-stage fixed rod, when the lowest section of the first-stage trapezoidal external thread on the first-stage screw rod is contacted with the first-stage trapezoidal internal thread on the upper side outside the first-stage driving rod, because the thread pitch of the lowest section of the first-stage trapezoidal external thread on the first-stage screw rod is gradually reduced from top to bottom, in order to reduce the impact force between the primary screw rod and the primary driving rod, the motor assembly gradually reduces the rotating moment and speed, and avoids the locking between the primary screw rod and the primary driving rod (the primary driving rod is convenient to be separated from each other when rotating reversely); at the moment, the first-stage screw rod and the first-stage driving rod are connected into a whole in a transmission mode and rotate together, the second-stage screw rod moves upwards under the driving of the first-stage screw rod, the first guide key at the excircle of the upper end of the first-stage fixing rod is in jacking contact with the lower end of the first guide groove at the inner wall of the second-stage fixing rod, namely the first guide key pulls the second-stage fixing rod to move upwards, and the second guide groove formed in the inner circle of the second-stage screw rod slides upwards along the second guide key at. In the process that the first-stage screw rod and the second-stage screw rod move upwards, the screw rod plug arranged at the upper end of the second-stage screw rod drives the refill piston to move upwards along the inner wall of the injection refill, so that the liquid medicine in the refill is injected into the skin tissue of a human body; when the second guide key integrally arranged on the excircle of the upper end of the second-stage fixed rod is in top pressure contact with the lower end of the second guide groove on the inner wall of the second-stage screw rod, namely the second guide key pulls the second-stage screw rod to move upwards, the motor assembly stops rotating, the first-stage telescopic transmission mechanism and the second-stage telescopic transmission mechanism reach the extension limit, and the whole insulin injection process is even completed. At the moment, if the motor assembly continues to rotate, the second-stage screw rod, the first-stage driving rod and the refill piston synchronously rotate together, the refill piston does not move upwards any more, and the safety of the injection dosage and the core components of the insulin pump are protected from being damaged.

After the insulin injection is finished, insulin needs to be refilled, and the specific process of filling the insulin liquid medicine comprises the following steps: the motor component drives the motor gear to rotate reversely, the driving gear ring meshed with the motor gear also rotates reversely, the driving gear ring rotates reversely to drive the primary driving rod to rotate reversely, then the primary screw rod meshed with the primary trapezoidal internal thread of the inner circle of the primary driving rod drives the secondary screw rod, the secondary fixing rod, the screw rod plug and the refill piston to move downwards along the primary fixing rod, when the primary screw rod moves downwards to a limit position, namely the lower ends of the primary screw rod and the secondary fixing rod are in top pressure contact with the upper surface of the fixing seat, the primary screw rod and the primary driving rod are connected into a whole in a transmission way, and the movement mode of the primary screw rod is changed from downward movement in the vertical direction; along with the counter rotation of one-level lead screw, can move down along the second grade dead lever with the trapezoidal internal thread meshing of the second grade of circle in the one-level lead screw, when the bottom of second grade lead screw removed and the fixing base upper surface was about to contact, one-level flexible drive mechanism and second grade flexible drive mechanism reached the limit of withdrawal, and motor element stall is accomplished from this and is filled with the medicine, gets back to promptly and is full of liquid medicine (insulin) state.

The coaxial line installation of one-level dead lever, second grade dead lever, one-level lead screw, second grade lead screw and one-level actuating lever makes wholly one-level flexible drive mechanism with second grade flexible drive mechanism motion is steady, has the support rigidity.

In addition, in order to reduce the sliding friction force between the lower end of the primary driving rod and the fixed seat during rotation, a ball can be arranged between the lower end face of the primary driving rod and the upper surface of the fixed seat.

To sum up, the utility model has the advantages that:

1) aiming at the problem of overlong length of a single-stage driving rod, the utility model adopts the design idea of a two-stage type driving telescopic rod structure (a first-stage telescopic transmission mechanism and a second-stage telescopic transmission mechanism) to ensure that the whole volume of the insulin pump becomes more exquisite and convenient to carry on the premise of increasing the injection amount for one time;

2) aiming at the difficult problem of low insulin injection precision, the design method of the two-section type driving telescopic rod structure is adopted, so that the total telescopic length of the driving rod is longer than that of a single-section type driving rod, and the grading precision of the stepping mechanism of the insulin pump can be improved (the number of rotation turns of the motor component is increased).

Drawings

Fig. 1 is a schematic view of the initial state of the present invention (the first-stage telescopic transmission mechanism and the second-stage telescopic transmission mechanism both contract in the shortest state) ready for injection after being filled with insulin liquid medicine;

FIG. 2 is a schematic view of the middle state of the injection process of the present invention (the primary telescopic transmission mechanism is extended to the extreme position);

fig. 3 is a schematic view of the utility model after the injection of the liquid medicine is completed (the first-stage telescopic transmission mechanism and the second-stage telescopic transmission mechanism are both extended to the limit positions);

fig. 4 is a schematic view of an intermediate state of the liquid medicine filling process of the present invention (the first-stage telescopic transmission mechanism is contracted and reset, and the second-stage telescopic transmission mechanism is extended to the limit position);

fig. 5 is an enlarged view at a in fig. 3.

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.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "length", "width" and "longitudinal", "transverse,

The directional or positional relationships "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are indicative of the directional or positional relationships illustrated in the drawings, are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be a mechanical connection; may be connected directly or indirectly through an intermediary device, or may be connected by electrical lines or signals. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance

Either implicitly or explicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

As shown in fig. 1-5, the two-stage injection driving rod structure of insulin pump of the present invention comprises a first stage telescopic transmission mechanism, a second stage telescopic transmission mechanism and an injection mechanism arranged inside the housing of the insulin pump; the second-stage telescopic transmission mechanism is arranged in the first-stage telescopic transmission mechanism and is in transmission connection with the first-stage telescopic transmission mechanism, and the injection mechanism is arranged at the upper end part of the second-stage telescopic transmission mechanism;

the shell comprises a bottom cover 1 and an upper shell 3 which are buckled into a whole, a fixed seat 2 is arranged on the left side in the bottom cover 1, a positioning hole 31 with an open top is arranged on the fixed seat 2, a lower positioning ring 32 used for limiting the outer part of the upper end of a primary telescopic transmission mechanism is arranged on the upper surface of the fixed seat 2, an upper positioning ring 33 used for limiting the outer part of the lower end of the primary telescopic transmission mechanism is arranged on the left side of the inner wall of the upper shell 3, the upper positioning ring is positioned right above the lower positioning ring 32, and the central lines of the upper; the lower end of the primary telescopic transmission mechanism is arranged on the fixed seat 2.

One-level telescopic transmission mechanism includes drive ring gear 6, one-level actuating lever 4, one-level lead screw 8 and one-level dead lever 5, the fixed setting in locating hole 31 of 5 lower extremes of one-level dead lever, one-level actuating lever 4 and one-level lead screw 8 are the cylinder structure, the upper end and the lower extreme of one-level actuating lever 4 rotate respectively and are connected in last holding ring 33 and holding ring 32 down, 6 coaxial arrangement of drive ring gear at the excircle upper portion of one-level actuating lever 4, the interior circle upper portion of one-level actuating lever 4 is equipped with one-section one-level trapezoidal internal thread 34, the excircle of one-level lead screw 8 is equipped with the trapezoidal external screw thread 35 of one-level with the trapezoidal internal thread.

The secondary telescopic transmission mechanism comprises a secondary screw rod 10, the two-stage fixing rod 7 and the screw rod plug 11, the two-stage screw rod 10 and the two-stage fixing rod 7 are both cylinder structures, a two-stage trapezoidal external thread 37 in threaded connection with a two-stage trapezoidal internal thread 36 is arranged on the outer circle of the two-stage fixing rod 10, the inner circle of the two-stage fixing rod 7 is slidably sleeved outside the one-stage fixing rod 5, a first guide groove 38 is axially formed in the inner wall of the two-stage fixing rod 7, the upper end of the first guide groove 38 is flush with the upper end of the two-stage fixing rod 7, a first guide key 39 slidably connected into the first guide groove 38 is integrally arranged on the outer circle of the upper end of the one-stage fixing rod 5, the inner circle of the two-stage screw rod 10 is slidably sleeved outside the two-stage fixing rod 7, a second guide groove 40 is axially formed in the inner wall of the two-stage screw rod 10; the screw rod plug 11 is fixedly arranged at the upper end part of the secondary screw rod 10.

The injection mechanism comprises an injection pen core 9, a pen core piston 12 and an infusion pipeline 13, the injection pen core 9 is vertically arranged at the upper part of the left side in the upper shell 3, the pen core piston 12 is sealed on the inner wall of the injection pen core 9 in a sliding mode, the infusion pipeline 13 is arranged at the upper end of the injection pen core 9 and extends out of the upper shell 3, and the upper end of the screw rod plug 11 is fixedly connected with the bottom surface of the pen core piston 12.

The one-level trapezoidal internal thread 34 on the upper portion of the inner circle of the one-level driving rod 4, the one-level trapezoidal external thread 35 of the one-level screw rod 8, the two-level trapezoidal internal thread 36 of the two-level screw rod 10 and the two-level trapezoidal internal thread 36 of the two-level screw rod are both in a trapezoidal thread structure, the thread pitches of all the threads are kept consistent, and the thread pitch of one section of the lowest portion of the one-level trapezoidal external thread 35 of the one-level screw rod 8 is smaller.

The lower end of the first-level fixing rod 5 is inserted into the positioning hole 31 on the fixing base 2 and is fixedly connected with the fixing base 2, and relative sliding and relative rotation do not occur. A motor gear 16 meshed with the driving gear ring 6 of the primary telescopic transmission mechanism and a motor assembly 15 for driving the motor gear 16 to rotate forward and backward are arranged on the right side in the shell.

The utility model discloses a working process does: when injecting the liquid medicine, the motor assembly 15 drives the motor gear 16 to rotate, thereby driving the driving gear ring 6 engaged with the motor gear 16 to rotate, the driving gear ring 6 further drives the primary driving rod 4 to rotate, the primary screw 8 engaged with the primary trapezoidal internal thread 34 at the upper part of the inner circle of the primary driving rod 4 and the secondary telescopic transmission mechanism move upwards along the primary fixing rod 5, the first guide groove 38 at the inner wall of the secondary fixing rod 7 slides upwards along the first guide key 39 integrally arranged at the upper end outer circle of the primary fixing rod 5, when the lowest section of the primary trapezoidal external thread 35 on the primary screw 8 is contacted with the primary trapezoidal internal thread 34 at the upper part of the outer part of the primary driving rod 4, because the pitch of the lowest section of the primary trapezoidal external thread 35 on the primary screw 8 is gradually reduced from top to bottom, in order to lighten the impact force between the primary screw 8 and the primary driving rod, and the first-stage screw rod 8 and the first-stage driving rod 4 are prevented from being locked (the first-stage driving rod 4 is convenient to be separated from each other when being reversed); at the moment, the first-stage screw rod 8 and the first-stage driving rod 4 are connected into a whole in a transmission mode and rotate together, the second-stage screw rod 10 moves upwards under the driving of the first-stage screw rod 8, the first guide key 39 at the outer circle of the upper end of the first-stage fixing rod 5 is in abutting contact with the lower end of the first guide groove 38 in the inner wall of the second-stage fixing rod 7, namely the first guide key 39 pulls the second-stage fixing rod 7 to move upwards, and the second guide groove 40 formed in the inner circle of the second-stage screw rod 10 slides upwards along the second guide key 41 at the. In the process that the primary screw rod 8 and the secondary screw rod 10 move upwards, a screw rod plug 11 arranged at the upper end of the secondary screw rod 10 drives a refill piston 12 to move upwards along the inner wall of the injection refill 9, so that the liquid medicine in the refill is injected into the skin tissue of a human body; when the second guide key 41 integrally arranged on the outer circle of the upper end of the second-stage fixing rod 7 is in top pressure contact with the lower end of the second guide groove 40 on the inner wall of the second-stage screw rod 10, namely the second guide key 41 pulls the second-stage screw rod 10 to move upwards, the motor assembly 15 stops rotating, the first-stage telescopic transmission mechanism and the second-stage telescopic transmission mechanism reach the extension limit, and the whole insulin injection process is completed. At this time, if the motor assembly 15 continues to rotate, the secondary lead screw 10, the primary lead screw 8, the primary driving lever 4 and the cartridge piston 12 rotate together in synchronization, and the cartridge piston 12 does not move upward any more, thereby protecting the safety of the injected medicine amount and the core components of the insulin pump from being damaged.

After the insulin injection is finished, insulin needs to be refilled, and the specific process of filling the insulin liquid medicine comprises the following steps: the motor assembly 15 drives the motor gear 16 to rotate reversely, the driving gear ring 6 meshed with the motor gear 16 also rotates reversely, the driving gear ring 6 rotates reversely to drive the primary driving rod 4 to rotate reversely, then the primary lead screw 8 meshed with the primary trapezoidal internal thread 34 on the inner circle of the primary driving rod 4 drives the secondary lead screw 10, the secondary fixing rod 7, the lead screw plug 11 and the refill piston 12 to move downwards along the primary fixing rod 5, when the primary lead screw 8 moves downwards to a limit position, namely the lower ends of the primary lead screw 8 and the secondary fixing rod 7 are in top pressure contact with the upper surface of the fixing seat 2, the primary lead screw 8 and the primary driving rod 4 are connected into a whole in a transmission way, and the movement mode of the primary lead screw 8 is changed from downward movement in the vertical; along with the counter rotation of one-level lead screw 8, can move down along second grade dead lever 7 with the second grade lead screw 10 of the trapezoidal internal thread 36 meshing of the second grade of circle in one-level lead screw 8, when the bottom of second grade lead screw 10 removed and the fixing base 2 upper surface was about to contact, one-level telescopic transmission mechanism and second grade telescopic transmission mechanism reached the limit of withdrawal, and motor element 15 stall accomplishes from this and fills medicine, gets back to and is full of liquid medicine (insulin) state promptly.

The coaxial line installation of one-level dead lever 5, second grade dead lever 7, one-level lead screw 8, second grade lead screw 10 and one-level actuating lever 4 makes wholly one-level flexible drive mechanism with second grade flexible drive mechanism motion is steady, has the support rigidity.

In addition, in order to reduce the sliding friction between the lower end of the primary driving rod 4 and the fixing seat 2 during rotation, a ball may be disposed between the lower end surface of the primary driving rod 4 and the upper surface of the fixing seat 2, which is a common technique and the detailed structure is not repeated.

Still be equipped with the control module 17 that is used for controlling motor assembly 15 just reversing in insulin pump's the casing to and be used for monitoring the flexible drive mechanism of one-level inside and the flexible drive mechanism of second grade to extreme position's sensor module, control module 17 and sensor module are no longer the utility model discloses within the claimed subject, also need not new computer program, consequently no longer give unnecessary detail its control principle.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Insulin pump two-section type injection drive pole structure, its characterized in that: comprises a primary telescopic transmission mechanism, a secondary telescopic transmission mechanism and an injection mechanism which are arranged in a shell of an insulin pump; the second-stage telescopic transmission mechanism is arranged in the first-stage telescopic transmission mechanism and is in transmission connection with the first-stage telescopic transmission mechanism, and the injection mechanism is arranged at the upper end part of the second-stage telescopic transmission mechanism;

2. The two-stage injection driving rod structure of insulin pump according to claim 1, characterized in that: one-level telescopic transmission mechanism includes the drive ring gear, the one-level actuating lever, one-level lead screw and one-level dead lever, the fixed setting of one-level dead lever lower extreme is in the locating hole, one-level actuating lever and one-level lead screw are the cylinder structure, the upper end and the lower extreme of one-level actuating lever rotate respectively and are connected in last holding ring and lower holding ring, drive ring gear coaxial arrangement is on the excircle upper portion of one-level actuating lever, the interior circle upper portion of one-level actuating lever is equipped with the trapezoidal internal thread of a lesson one-level, the excircle of one-level lead screw is equipped with the trapezoidal external screw thread of.

3. The two-stage injection driving rod structure of insulin pump according to claim 2, characterized in that: the second-stage telescopic transmission mechanism comprises a second-stage lead screw, a second-stage fixed rod and a lead screw plug, the second-stage lead screw and the second-stage fixed rod are both of cylindrical structures, a second-stage trapezoidal external thread in threaded connection with a second-stage trapezoidal internal thread is arranged on the excircle of the second-stage lead screw, the inner circle of the second-stage fixed rod is sleeved outside the first-stage fixed rod in a sliding mode, a first guide groove is formed in the inner wall of the second-stage fixed rod along the axial direction, the upper end of the first guide groove is flush with the upper end of the second-stage fixed rod, a first guide key in sliding connection with the first guide groove is integrally arranged on the excircle of the upper end of the first-stage fixed rod, the inner circle of the second-stage lead screw is sleeved outside the second-stage fixed rod in a; the screw rod plug is fixedly arranged at the upper end part of the secondary screw rod.

4. The two-stage injection driving rod structure of insulin pump according to claim 3, characterized in that: the injection mechanism comprises an injection pen core, a pen core piston and an infusion pipeline, the injection pen core is vertically arranged on the upper portion of the left side in the upper shell, the pen core piston is sealed on the inner wall of the injection pen core in a sliding mode, the infusion pipeline is arranged at the upper end of the injection pen core and extends out of the upper shell, and the upper end of the screw rod plug is fixedly connected with the bottom face of the pen core piston.

5. The two-stage injection driving rod structure of insulin pump according to claim 2, 3 or 4, characterized in that: the one-level trapezoidal internal thread on the upper portion of the inner circle of the one-level driving rod, the one-level trapezoidal external thread of the one-level screw rod, the two-level trapezoidal internal thread of the two-level screw rod are both in a trapezoidal thread structure, the thread pitches of all the threads are kept consistent, and the thread pitch of one-level trapezoidal external thread of the one-level screw rod at the lowest part is smaller than that of the one-level trapezoidal internal thread and is gradually reduced from top to bottom.