CN110743064B

CN110743064B - electronic injection pen

Info

Publication number: CN110743064B
Application number: CN201911118004.9A
Authority: CN
Inventors: 董大銮; 金超
Original assignee: Hangzhou Kuaitong Technology Co ltd
Current assignee: Hangzhou Kuaitong Technology Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2023-12-01
Anticipated expiration: 2039-11-15
Also published as: CN110743064A

Abstract

The invention discloses an electronic injection pen, comprising: including pen shell, first actuating mechanism, liquid medicine section of thick bamboo subassembly, trade needle mechanism, second actuating mechanism, sensing control unit, trade bottle switch module and battery cell, each mechanism, subassembly and unit are all installed in pen shell inner chamber, trade needle mechanism and be in the front end of pen shell, liquid medicine section of thick bamboo subassembly is in the rear side of trading needle mechanism, first actuating mechanism is in the rear side of liquid medicine section of thick bamboo subassembly, sensing control unit connects first actuating mechanism, second actuating mechanism and battery cell, battery cell gives sensing control unit, first actuating mechanism and second actuating mechanism power supply, first actuating mechanism can act on the piston of card formula bottle in the liquid medicine section of thick bamboo subassembly, second actuating mechanism connects the liquid medicine section of thick bamboo subassembly in order to drive liquid medicine section of thick bamboo subassembly back-and-forth movement. The electronic injection pen disclosed by the invention adopts the double driving mechanisms, and the two driving mechanisms independently act and cannot influence each other. The sensing control unit can control the cooperation of all the components, and is intelligent and convenient.

Description

Electronic injection pen

Technical Field

The invention relates to the technical field of medical supplies, belongs to injectors, and particularly relates to an electronic injection pen.

Background

The existing electronic injection pen generally has only one direct current motor, and generally has the following problems: prior to injection, the needle is manually inserted into the skin, causing significant mental stress on the patient; because the same motor is used for exhausting and injecting, the exhausting speed is consistent with the injecting speed, and the longest time for one-time exhausting is needed; the needle head is installed and pulled out manually, and the skin is easy to be pricked by mistake in the inserting and pulling process; when in injection, the injection speed is constant, and curve injection (such as slow injection, constant speed injection and the like) cannot be performed; the precision is not high, and the rotating speed is greatly interfered by factors such as voltage and the like due to the adoption of a direct current motor. And the injection pen with double motors is adopted, and the two driving motors are usually connected, or the position layout is unreasonable, so that the injection pen is not beneficial to popularization and use.

Disclosure of Invention

The invention relates to an electronic injection pen, which adopts double driving mechanisms, and the two double driving mechanisms respectively and independently operate without mutual influence, thereby being beneficial to high-efficiency injection and being capable of solving at least one or even all technical problems in the background technology.

The invention is realized by the following technical scheme:

the invention provides an electronic injection pen, comprising:

An electronic injection pen, comprising: including the pen shell, a drive mechanism, liquid medicine section of thick bamboo subassembly, trade needle mechanism, second actuating mechanism, sensing control unit, trade bottle switch module and battery unit, each mechanism, subassembly and unit are all installed in the inner chamber of pen shell, trade needle mechanism and be in the front end of pen shell, liquid medicine section of thick bamboo subassembly is in the rear side of trading needle mechanism, a drive mechanism is in the rear side of liquid medicine section of thick bamboo subassembly, sensing control unit connects a drive mechanism, second actuating mechanism and battery unit, battery unit gives sensing control unit, a drive mechanism and second actuating mechanism power supply, a drive mechanism can act on the piston of card formula bottle in the liquid medicine section of thick bamboo subassembly, a drive liquid medicine section of thick bamboo subassembly is connected to the second actuating mechanism in order to drive liquid medicine section of thick bamboo subassembly back and forth movement.

Through adopting above-mentioned technical scheme, utilize two actuating mechanism, first actuating mechanism can exhaust and inject, second actuating mechanism can drive liquid medicine section of thick bamboo subassembly back and forth movement, can drive the syringe needle to pierce skin and discharge in skin, need not the manual syringe needle of penetrating, first actuating mechanism and second actuating mechanism each independent action, do not have the direct connection relation on the physical apparatus between the two, when second actuating mechanism carries liquid medicine section of thick bamboo subassembly back and forth movement, can not drive first actuating mechanism together for the respective action of two actuating mechanisms can not give the influence of corresponding side. The needle changing mechanism can clamp the needle cap, and is convenient to take down and change. The sensing control unit can control the coordinated actions of all components, mechanisms and units, is intelligent and convenient, and is beneficial to popularization. And the first actuating mechanism is in the rear side of liquid medicine cartridge assembly for first actuating mechanism, liquid medicine cartridge assembly, needle changing mechanism are in same epaxial line, are favorable to first actuating mechanism to the stable smooth promotion of the piston in the card bottle in the liquid medicine cartridge assembly, make injection or exhaust steady high-efficient and safe. The whole pen shell is longer based on the design, and is favorable for holding by hand to perform stable operation.

As a further development of the invention, the first drive mechanism has at least,

the first driving speed is used for rapidly exhausting the cartridge bottle before injection; the method comprises the steps of,

the second driving speed is used for pushing the piston in the clip-on bottle during injection so as to complete the injection; the first drive speed is greater than the second drive speed. Through adopting above-mentioned technical scheme, first actuating mechanism has two kinds of drive speeds at least for the speed when the exhaust before the injection is different with the injection, and first drive speed is greater than the second drive speed, can realize high-efficient exhaust, and most reasonable injection improves whole injection quality and efficiency. Of course, during injection, the curve change of the injection speed can be realized according to the related parameters, the human body requirement of a patient is met, and intelligent injection is realized.

As a further improvement of the invention, the first driving mechanism comprises a first motor, a screw rod and a screw sleeve, wherein an output shaft of the first motor is connected with the screw rod, the screw sleeve is provided with internal threads and is in threaded connection with the screw rod, and the first motor is a stepping motor; or, the first driving mechanism comprises a first motor, a screw rod and a threaded sleeve, an output shaft of the first motor is connected with the threaded sleeve, the threaded sleeve is provided with internal threads, the screw rod is in threaded connection with the threaded sleeve, and the first motor is a stepping motor. By adopting the technical scheme, the first motor adopts the stepping motor, so that the motor rotating speed and the motor position can be accurately controlled, and the motor can rotate at a certain angle (called a step angle) by adding a proper pulse signal, and the rotating speed is in direct proportion to the pulse frequency. By controlling the pulse signals, the orderly adjustment of each speed can be realized, so that the exhaust can be rapidly carried out, the injection speed can be controllably changed in the injection process, and the medical requirements can be met.

As a further improvement of the invention, the screw sleeve is provided with a guide block or a guide groove, and the pen shell is provided with a guide groove or a guide block matched with the guide block or the guide groove for the screw sleeve to move linearly. By adopting the technical scheme, the guide block or the guide is arranged, so that the screw sleeve can move along the preset linear track, and the piston in the clip-type bottle can be pushed smoothly.

As a further improvement of the invention, the second driving mechanism comprises a second motor, a worm and a rack, wherein an output shaft of the second motor is connected with the worm, the worm is meshed with the rack, and the rack is fixedly arranged on the liquid medicine cylinder assembly; or the second driving mechanism comprises a second motor, a screw rod and a first nut, an output shaft of the second motor is connected with the screw rod, the screw rod is in threaded connection with the first nut, and the first nut is fixedly arranged on the liquid medicine cylinder assembly. Through adopting above-mentioned technical scheme, the worm can be driven to rotate to the second motor in the second actuating mechanism, and the cooperation of worm and rack can be with rotary motion conversion rectilinear motion to make rack rectilinear motion, make liquid medicine cartridge assembly rectilinear motion.

As a further improvement of the invention, the liquid medicine cylinder assembly comprises a liquid medicine cylinder, a first bracket, a guide rod, a third bracket, a touch control piece and a first spring, wherein the front part of the liquid medicine cylinder is hinged to the third bracket through the first bracket, the third bracket is movably arranged on the guide rod, the guide rod is arranged on the pen shell, the touch control piece is arranged on the first bracket, and the first spring is connected with the liquid medicine cylinder and the third bracket; or, the liquid medicine cylinder assembly comprises a liquid medicine cylinder, a guide rod, a support III, a touch control piece and a spring I, wherein the liquid medicine cylinder is hinged to the support III, the spring I is connected with the liquid medicine cylinder and the support III, the touch control piece is hinged to the liquid medicine cylinder, the support III is movably arranged on the guide rod, and the guide rod is arranged on the pen shell. Through adopting above-mentioned technical scheme, can place the card formula bottle in the liquid medicine section of thick bamboo subassembly, support one can hinge the liquid medicine section of thick bamboo on support three, touch the controlling part and install on support one, can be used to trigger the sensor. The first spring connects the liquid medicine cylinder with the third bracket, and can be used for bouncing the liquid medicine cylinder and the third bracket around the hinged position, so that the clamp type bottle can be conveniently replaced.

As a further improvement of the invention, the bottle changing switch component comprises a bottle changing button, a connecting frame, a spring III and a fixing column, wherein the bottle changing button is propped against the connecting frame, the connecting frame is arranged on the fixing column and can be used for locking and unlocking the liquid medicine cylinder, the fixing column is arranged on the pen shell or integrally formed on the pen shell or arranged on the bracket III, and the spring III is connected with the fixing column and the connecting frame. Through adopting above-mentioned technical scheme, the setting of each part in the bottle switch subassembly is traded for press this bottle button that trades, can act on the link, and then drive the link and remove, with the locking to the liquid medicine section of thick bamboo, the liquid medicine section of thick bamboo pops out, with the card bottle of change, convenient high efficiency.

As a further improvement of the invention, the needle changing mechanism comprises a cylinder frame, a needle pulling support and a needle inserting support, wherein the needle pulling support and the needle inserting support are both arranged on the cylinder frame, and a second spring is connected between the needle pulling support and the needle inserting support; or, the needle changing mechanism comprises a cylinder frame and a needle pulling support, the needle pulling support is arranged on a needle pulling button, and a second spring is connected between the needle pulling support or the needle pulling button and the cylinder frame. Through adopting above-mentioned technical scheme, the section of thick bamboo frame can carry out the auxiliary clamping effect of certain degree to the needle cap in the needle change mechanism, and the front end of the liquid medicine section of thick bamboo of being convenient for inserts in the needle cap, pulls out the needle support after the injection, can be used to stop the needle cap, prevents that the needle cap from following in the liquid medicine section of thick bamboo indentation pen, breaks away from the liquid medicine section of thick bamboo from the needle cap, namely is called to pull out the needle. When the needle cap is plugged into the barrel frame, the needle inserting support is contacted, and the needle inserting support triggers the corresponding sensor to show the insertion of the needle cap. In other versions, i.e., versions where no needle insertion support is provided, the needle cap is inserted into the cartridge holder and then the needle insertion sensor is touched to indicate insertion of the needle cap.

As a further improvement of the invention, the sensing control unit comprises a circuit board, a micro-control unit arranged on the circuit board, a first sensor for sensing the position information of the first driving mechanism, a second sensor for sensing the limit position information of the backward movement of the liquid medicine cylinder component, a third sensor for sensing the limit position information of the forward movement of the liquid medicine cylinder component, a fourth sensor for sensing whether the liquid medicine cylinder component contacts with the skin, a fifth sensor for sensing the relative position information of the inner needle cap in the needle cap and the liquid medicine cylinder (i.e. whether the inner needle cap is inserted on the liquid medicine cylinder) and a sixth sensor or a eighth sensor for sensing the position information of the outer needle cap in the needle cap, wherein each sensor is connected to the micro-control unit, and by adopting the technical scheme, the micro-control unit in the sensing control unit can control the execution of corresponding actions according to the signals measured by each sensor.

As a further improvement of the invention, the pen also comprises a display unit, wherein the display unit is connected with the sensing control unit, a window for the display unit to display is arranged on the pen shell, and a USB interface or/and a Bluetooth module is also arranged in the sensing control unit. By adopting the technical scheme, the display unit is favorable for displaying the relevant information of the electric injection pen, such as battery electric quantity and charging state, residual dose, injection dose setting, real-time temperature, injection record, date and time setting, bluetooth connection state and the like, and the visualization and automation degree is improved. In addition, the circuit board is also provided with a USB interface or/and a Bluetooth module so as to realize data sharing and convenient storage.

In summary, compared with the prior art, the scheme of the invention can at least realize one or all of the following beneficial effects:

(1) One-key needle pulling: the needle can be pulled out automatically only by pressing the button once at most;

(2) One-key quick exhaust: only 5s is needed at most to complete the exhaust function;

(3) One-key automatic injection: the needle insertion, injection and needle discharge can be completed at most by only pressing a button once;

(4) The needle is hidden in the whole course of a series of processes of inserting, exhausting, needle feeding, injection, needle discharging and needle pulling, so that psychological burden of a patient is eliminated;

(5) Recording the injection time and the injection dosage of each time, and collecting data through the Internet of things;

(6) The structure layout is reasonable and compact, and is favorable for holding by hand.

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of the overall structure of an electronic injection pen according to embodiment 1 of the present invention;

fig. 2 is a schematic view of another angle structure of the electronic injection pen according to embodiment 1 of the present invention;

FIG. 3 is an exploded view of an electronic injection pen according to embodiment 1 of the present invention;

FIG. 4 is an enlarged schematic view of the portion I in FIG. 3;

FIG. 5 is another exploded view of the electronic injection pen according to embodiment 1 of the present invention;

FIG. 6 is an exploded view of an electronic injection pen according to another embodiment 1 of the present invention;

FIG. 7 is an enlarged schematic view of the portion II in FIG. 6;

fig. 8 is an exploded view of a first driving mechanism of the electronic injection pen according to embodiment 1 of the present invention;

fig. 9 is a schematic diagram of a liquid cartridge assembly of an electronic injection pen according to embodiment 1 of the present invention;

fig. 10 is an exploded view of a cartridge assembly of an electronic injection pen according to embodiment 1 of the present invention;

fig. 11 is an exploded view of a cartridge assembly and a second driving mechanism of the electronic injection pen according to embodiment 1 of the present invention;

fig. 12 is an exploded schematic view of a needle changing mechanism of the electronic injection pen according to embodiment 1 of the present invention;

fig. 13 is a schematic diagram of a sensing control unit of an electronic injection pen according to embodiment 1 of the present invention;

FIG. 14 is a schematic view of another angle configuration of the sensing control unit of FIG. 13;

fig. 15 is a schematic diagram of a bottle-changing switch assembly of the electronic injection pen according to embodiment 1 of the present invention;

fig. 16 is a schematic diagram of a bottle changing structure of the electronic injection pen according to embodiment 1 of the present invention;

fig. 17 is a schematic diagram illustrating bottle changing and analysis of an electronic injection pen according to embodiment 1 of the present invention;

Fig. 18 is a control schematic block diagram of an electronic injection pen according to embodiment 1 of the present invention;

FIG. 19 is a flowchart of the steps of using the electronic injection pen according to embodiment 1 of the present invention;

FIG. 20 is a schematic diagram of an explosion structure of an electronic injection pen according to embodiment 3 of the present invention;

FIG. 21 is an enlarged schematic view of the portion III of FIG. 20;

FIG. 22 is a schematic view of another angle exploded structure of the electronic injection pen according to embodiment 3 of the present invention;

FIG. 23 is an enlarged schematic view of the portion IV of FIG. 22;

fig. 24 is a schematic structural view of a cartridge of an electronic injection pen according to embodiment 3 of the present invention;

fig. 25 is a schematic view of another angle structure of a liquid cartridge of an electronic injection pen according to embodiment 3 of the present invention.

In the figure: the first driving mechanism 11, the first motor 111, the lead screw 112, the sleeve 113, the guide block 1133, the flange 1132, the touch portion 1131, the cartridge assembly 12, the cartridge 121, the recess 1210, the deck 1211, the boss 1212, the hole one 1213, the post two 1214, the through hole one 1215, the post three 1216, the through hole two 1217, the through hole three 1218, the bracket one 122, the post one 1221, the support portion 1222, the limit portion 1223, the sensor seven 123, the bracket two 124, the guide rod 125, the bracket three 126, the bottom plate 1261, the side plate one 1262, the through hole four 12621, the side plate two 1263, the front plate 1264, the through hole five 12641, the limit frame 1265, the touch portion 127, the touch portion one 1271, the mounting portion 1272, the touch portion two 1273, the hinge lug 4, the spring one 128, the clip bottle 129, the needle changing mechanism 13, the cartridge 131, the through hole six 1311, the post four 1312, the post five 1313, the step hole 1314, the needle pulling bracket 132, the clip portion 1321, the clip portion 1322, the mounting portion 1322, the abutment portion 1323 the needle insertion holder 133, the abutment portion one 1331, the mounting portion three 1332, the abutment portion three 1333, the spring second 134, the pressing block 135, the sensor eighth 136, the second driving mechanism 14, the second motor 141, the worm 142, the rack 143, the sensor trigger portion 1431, the lead screw 144, the nut one 145, the sensor control unit 15, the circuit board 151, the notch 1511, the sensor five 152, the sensor six 153, the sensor four 154, the sensor one 156, the sensor two 157, the sensor three 158, the change-bottle switch assembly 16, the change-bottle button 161, the connecting frame 162, the abutment portion four 1621, the through hole eighth 1622, the limit boss portion 1623, the spring third 163, the fixing post 164, the second housing 17, the change-bottle through hole 171, the mounting ear 172, the cylinder cover 18, the hook 181, the pivot shaft 182, the needle cap 19, the inner needle cap 191, the outer needle cap 192, the pen cap 20, the first housing 21, the window 211, the film button mounting portion 212, the pull-button mounting portion 213, the mounting portion one 214, support plate 215, guide slot 216, display unit 22, waterproof ring 23, battery unit 24, pull out needle button 25.

Detailed Description

The following drawings and preferred embodiments are provided to further illustrate the technical means and effects adopted to achieve the preset purpose of the present application, and the detailed description of the specific embodiments, structures, features and effects according to the present application is given below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The front and rear of the present application refer to the front direction of the needle cap 19 and the rear direction away from the needle cap when the electronic injection pen is in use.

In the present application, the step motor is an open loop control element step motor element which converts an electric pulse signal into angular displacement or linear displacement. In the case of non-overload, the rotational speed of the motor, the position of stopping, is only dependent on the frequency and number of pulses of the pulse signal, and is not affected by load variations, when the step driver receives a pulse signal, it drives the step motor to rotate a fixed angle in a set direction, called "pitch angle", and its rotation is operated step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses, so that the aim of accurate positioning is fulfilled; meanwhile, the rotating speed and the acceleration of the motor can be controlled by controlling the pulse frequency, so that the aim of speed regulation is fulfilled. The stepping motor can realize accurate control of the motor rotation speed and the motor position, and errors are not accumulated. The sequence of the pulses is changed, so that the rotation direction can be conveniently changed. The stepping motor can normally operate at low speed.

In the present application, the dc motor means a motor that converts dc power into mechanical power.

Example 1

An electronic injection pen as shown in fig. 1 to 17, which comprises a pen shell, a first driving mechanism 11, a liquid medicine barrel assembly 12, a needle changing mechanism 13, a second driving mechanism 14, a sensing control unit 15, a bottle changing switch assembly 16, a display unit 22 and a battery unit 24, wherein all the mechanisms, the assemblies and the units are arranged in an inner cavity of the pen shell, the needle changing mechanism 13 is positioned at the front end of the injection pen, the liquid medicine barrel assembly 12 is positioned at the rear side of the needle changing mechanism 13, the first driving mechanism 11 is positioned at the rear side of the liquid medicine barrel assembly 12, the battery unit 24 is positioned at the rear side of the first driving mechanism 11 and at the rear end of the electronic injection pen, the sensing control unit 15 is connected with the first driving mechanism 11, the second driving mechanism 14, the battery unit 24 and the display unit 22, and the battery unit supplies power to the display unit, the sensing control unit and all the driving mechanisms. The first driving mechanism 11, the liquid medicine cartridge assembly 12 and the needle changing mechanism 13 are positioned on the same axis, the battery unit 24 is also positioned on the axis and positioned at the rear end, the structure is compact, the layout is reasonable, the stable and smooth pushing of the first driving mechanism 11 to the piston in the clip type bottle 129 in the liquid medicine cartridge assembly 12 is facilitated, and the injection or the exhaust is stable, efficient and safe.

Referring to fig. 1 to 7, the rear portion of the pen case is curved and reduced inwards, the size is smaller, the front portion of the pen case is curved and expanded outwards, the size is larger, the pen case is generally in a fish shape, the design of the shape is favorable for holding the rear portion with smaller size, and the needle at the front portion is used for injection operation, so that the holding feeling of an operator is improved, and the pen case is favorable for stable holding for injection. The pen shell comprises a first shell 21 and a second shell 17, the first shell and the second shell are fixed by a fastener after being combined, and a waterproof ring 23 and a pen cap 20 are arranged at the front part of the pen shell. The first case 21 is provided with a window 211 for displaying the display unit 22, the front of the window 211 is provided with a membrane button mounting part 212, the membrane button mounting part 212 can be an inward concave groove for mounting a membrane button, the front of the membrane button mounting part 212 is provided with a needle pulling button mounting part 213, the needle pulling button mounting part 213 can be a through hole, and the needle pulling button 25 is mounted at the through hole and can act on a locking part 1321 on the needle pulling bracket 132. The front end of the first housing 21 has a stepped portion of reduced size that can be used for the insertion snap-fit of the cap 20, so that the cap surface smoothly transitions with the surface of the first housing 21 when the cap snaps onto the stepped portion. The inner side of the first shell 21 is provided with a guide groove 216 arranged along the length direction of the pen shell at the rear position thereof for guiding a guide block 1133 of the screw sleeve 113 in the first driving mechanism 11; inside the first case 21, at the rear side of the window 211, a protruding cylindrical mounting portion 214 is provided for mounting the fixing post 164 in the bottle changing switch assembly 16. In front of the window 211, a protruding support plate 215 is provided at a front position inside the first housing 21, and a through hole is provided in the support plate 215 for mounting the guide rod 125 in the cartridge assembly 12. The second shell 17 is provided with a cylinder changing through hole 171, the inner side wall of the cylinder cover 18 is provided with a hook 181 and a pivot shaft 182, the pivot shaft 182 can be arranged on the mounting lug 172 on the inner side of the second shell 17, the cylinder cover 18 can rotate conveniently, and the cylinder cover 18 can cover the cylinder changing through hole 171. The first and second housings 21 and 17 are closed to form an interior space, i.e., a pen housing cavity, for mounting the mechanisms and components.

The first driving mechanism 11, referring to fig. 3, 5 and 8, includes a first motor 111, a screw 112 and a screw sleeve 113, wherein the screw 112 is an output end of the first motor 111, and the screw 112 is linear. The first motor 111 is a stepping motor, and the first motor 111 can control the rotation speed and angle of the screw 112, so that the screw 112 can rotate at different speeds, and the screw sleeve 113 can further travel at different speeds. For example, during the venting of the interior of the cartridge 129, a first, faster drive speed is used to quickly complete the venting, while during the injection of the medical fluid into the patient, a second, slower drive speed is used to meet the injection requirements. And during actual injection, the second driving speed can also be regulated in a curve manner so as to meet the requirements of human bodies and ensure the injection efficacy. The screw sleeve 113 is provided with internal threads and is sleeved on the screw rod 112, and the internal threads on the screw sleeve 113 are meshed with the screw rod 112. The side of one end of the screw sleeve 113 is provided with a guide block 1133, and the guide block 1133 can be positioned in the guide groove 216 of the pen shell, so that when the screw rod 112 rotates, the screw sleeve 113 can move linearly without rotating, the other side of the same end of the screw sleeve 113 is provided with a touch control part 1131 for triggering the first sensor 156, the other end of the screw sleeve 113 is provided with a flange 1132, the contact area with the piston in the cartridge bottle 129 is increased, and the stable and smooth pushing of the piston is facilitated.

The cartridge assembly 12, referring to fig. 3, 5, 9 and 10, includes a cartridge 121, a first bracket 122, a second bracket 124, a guide rod 125, a third bracket 126, a touch control 127 and a first spring 128. The front part of the liquid medicine barrel 121 is hinged on a third bracket 126 through a first bracket 122, the third bracket 126 is arranged on a guide rod 125, a clamp type bottle 129 can be placed in the liquid medicine barrel 121, a sensor seven 123 is arranged on the side part of the front end of the liquid medicine barrel 121 and used for sensing whether the clamp type bottle 129 is in place, and a second bracket 124 is arranged at the front end of the liquid medicine barrel 121 in a buckling mode. The touch control 127 is mounted on the first bracket 122 for triggering the sensor five 152 to show the insertion of the needle cap 19 into place. The needle cap 19 comprises an outer needle cap and an inner needle cap, the needle is fixed on the inner needle cap, the outer needle cap is sleeved on the inner needle cap, the protection function is achieved, in actual use, after the needle cap 19 is inserted on the liquid medicine barrel 121, the outer needle cap can be pulled out, and the inner needle cap with the needle is left at the front end of the liquid medicine barrel, so that injection is completed.

Referring to fig. 5, 9, 10, 11 and 16, the rear part of the liquid medicine barrel 121 is provided with a clamping table 1211, the clamping table 1211 is provided with a concave groove along the length direction of the liquid medicine barrel 121 for clamping the hook 181 on the barrel cover 18, and when the barrel cover 18 is opened, the liquid medicine barrel 121 can be rotated along the belt to replace the clamp bottle 129. As shown in fig. 10, a boss 1212 is provided above the clamp 1211 on the side wall of the cartridge 121 to protrude outward for abutment by a limit boss 1623 in the bottle changing switch assembly 16. The two sides of the front part of the liquid medicine cylinder 121 are provided with raised step parts, the step parts are provided with first holes 1213, and the first holes 1213 are blind holes for mounting and inserting the first convex columns 1221 on the first bracket 122. Two second bosses 1214 are provided protruding downward at the lower front side of the cartridge 121 for mounting the sensor seven 123. Referring to fig. 11, a first through hole 1215 penetrating the inner wall of the cartridge 121 is formed between the two posts 1214, and is used for placing a sensing switch 1231 on the sensor seven 123 to sense whether the cartridge 129 is in place. In front of the second projection 1214, the front end of the liquid medicine barrel is the plugging end of the needle cap 19, the side wall of the liquid medicine barrel where the second projection is located is transited with the plugging end through the inclined reduced barrel wall, the side wall of the plugging end of the liquid medicine barrel and the reduced barrel wall are provided with the second through hole 1217 for the front end of the touch piece 127 to extend in, the needle cap 19 is sleeved with the plugging end and then touches the front end of the touch piece 127, and the touch piece 127 can be acted by the needle cap 19 to generate the effect of tilting the rear end, so that the corresponding sensor five 152 is triggered. The side wall of the plugging end of the liquid medicine cylinder is also provided with a third through hole 1218 for overlapping and jointing the second bracket 124, and the upper side wall and the lower side wall of the plugging end are provided with convex blocks in a protruding way so as to be clamped with corresponding through holes on the second bracket 124. The third protruding column 1216 is arranged on the side wall of the first liquid medicine tube 121 in a protruding manner at the rear of the first hole 1213, and is used for installing the first spring 128, the first spring 128 is a torsion spring, one end of the torsion spring is connected to the first liquid medicine tube 121, the other end of the torsion spring is connected to the third bracket 126, the first spring 128 can open the first liquid medicine tube 121 and the third bracket 126 in an angle under the condition of no external force, and after the external force is applied, the tube cover 18 can be pushed into the pen shell, so that the limiting protruding part 1623 in the bottle changing switch assembly 16 abuts against the boss 1212, and the ejection of the first liquid medicine tube 121 is prevented.

Referring to fig. 9 to 11, the first bracket 122 includes a middle arc-shaped connecting portion, a clamping portion, a supporting portion 1222 and a limiting portion 1223, two ends of the arc-shaped connecting portion are respectively connected to a clamping portion, the two clamping portions are symmetrically arranged, and each clamping portion has a protruding column 1221 protruding inwards. The arc connecting part is in a sheet shape, the front side of the arc connecting part is connected with the supporting part 1222, referring to fig. 11, the supporting part 1222 is in a front-back through shape, the upper part of the supporting part is provided with a through groove, and the supporting part 1222 is used for installing and inserting the touch control 127 and plays a role in supporting the touch control 127. The rear side of the arc-shaped connecting part is connected with a limiting part 1223, and the limiting part 1223 is outwards bent and is used for limiting and installing the touch control 127. The first 1221 of the first bracket 122 is inserted into the fourth 12621 of the third bracket 126 and the first 1213 of the cartridge to pivotally connect the cartridge 121 to the third bracket 126.

Referring to fig. 9 and 10, the sensor seven 123 is a position switch of the bottle 129, and a mechanical sensor switch 1231 is provided on the sensor seven 123, when the front end wall of the bottle 129 touches the sensor switch 1231, the sensor seven 123 senses the signal and regards the bottle 129 as being transferred in place.

Referring to fig. 9, 10 and 11, the head of the second bracket 124 is in an annular shape, and has rectangular annular frames on the upper and lower sides of the head to be clamped on the protruding block of the front end plug-in portion of the liquid medicine cartridge 121. In addition, as shown in fig. 10 and 11, the second bracket 124 has a sheet-shaped leg extending backward on the left and right sides of the head to overlap in the third through hole 1218, and the outer wall of the leg slightly protrudes from the wall of the insertion portion at the front end of the cartridge to increase the friction force against the inner needle cap in the needle cap 19, so that the inner needle cap in the needle cap 19 inserted into the insertion portion is engaged, and the outer needle cap in the needle cap 19 can be manually pulled out from the inner needle cap.

Referring to fig. 6, 7 and 9, the guide rod 125 is fixedly mounted on the support plate 215 of the pen shell, the third support 126 is movably sleeved on the guide rod 125, and the third support 126 can move along the axial direction of the guide rod 125.

Referring to fig. 9, 10 and 11, the third bracket 126 has a bottom plate 1261, a side plate first 1262, a side plate second 1263, a front plate 1264 and a rear plate, the side plate first 1262 is connected to one side of the bottom plate 1261 and is arranged substantially perpendicular to the bottom plate (the transition portion may be a circular arc transition), the side plate second 1263 is connected to the other side of the bottom plate 1261 and is arranged substantially perpendicular to the bottom plate (the transition portion may be a circular arc transition), and the side plate first, the side plate second and the bottom plate form a groove-shaped structure for accommodating the liquid medicine tube 121. The front plate 1264 is connected to the front end or the rear end of the second side plate 1263 and is substantially perpendicular to the second side plate 1263 (the transition point may be a circular arc transition), and the rear plate is connected to the rear end or the front end of the second side plate 1263 and is substantially perpendicular to the second side plate 1263 (the transition point may be a circular arc transition). Through holes five 12641 for the guide rods 125 to penetrate are formed in the front plate and the rear plate. The front plate and the rear plate are both positioned outside the second side plate 1263, and a concave notch is formed in the middle of the second side plate 1263, so that the arrangement of the third protruding column 1216 and the first spring 128 is facilitated. The front parts of the side plate I1262 and the side plate II 1263 are respectively provided with a through hole IV 12621 for installing and inserting the convex column I1221 on the bracket I122. The first side plate 1262 is provided with a through hole for mounting the rack 143 in the second driving mechanism 14, two protruding blocks extending outwards are arranged between the through hole and the bottom plate on the first side plate 1262, and the protruding blocks can be used for limiting and supporting the mounting of the rack 143. The rear end of the bottom plate 1261 extends backwards and bends from the tail end to the side close to the liquid medicine cylinder to form a supporting guard plate, and after the card bottle 129 is placed, the height of the supporting guard plate exceeds the outer wall of the card bottle 129 but does not touch the inner wall of the card bottle, so that the card bottle can be locally protected, and the card bottle can be abutted without affecting the operation of the screw sleeve 113.

Referring to fig. 7, 9 and 11, the touch unit 127 has a first touch unit 1271, a mounting unit 1272 and a second touch unit 1273, the first touch unit 1271 is located at the rear end of the touch unit 127 and is used for triggering the sensor five 152, the second touch unit 1273 is located at the front end of the touch unit and is used for contacting the pin cap 19, and the mounting unit 1272 is connected with the first touch unit and the second touch unit. The second touch portion 1273 is bent inwards, the front end of the second touch portion extends forwards, the external dimension of the second touch portion can be matched with that of the second through hole 1217, and when the second touch portion is placed at the second through hole 1217, the outer edge of the second touch portion can slightly protrude out of the outer wall edge of the liquid medicine cartridge plug-in portion so as to effectively touch the needle cap. The mounting portion 1272 is inserted in the supporting portion 1222 and the limiting portion 1223 of the first bracket 122, and the first touch portion 1271 is bent outwards, corresponding to the position of the fifth sensor 152, so as to trigger the fifth sensor.

The clip bottle 129 is filled with liquid medicine, the tail part is sealed by a rubber piston, the head part is sealed by a rubber plug aluminum cover, the clip bottle can be put into a liquid medicine cylinder 121 of an injection pen for use, the rubber plug aluminum cover at the head part can be used for inserting a needle on the needle cap 19, and the rubber piston at the tail part can be used for pushing a screw sleeve 113 in the first driving mechanism 11.

Referring to fig. 3, 5, 7 and 12, the needle changing mechanism 13 includes a barrel frame 131, a needle pulling support 132 and a needle inserting support 133, the needle pulling support 132 and the needle inserting support 133 are both mounted on the barrel frame 131, and a second spring 134 is connected between the needle pulling support 132 and the needle inserting support 133.

The front part of the barrel frame 131 is a cylindrical part with a cylindrical structure, the rear part is a plate-shaped part with a plate-shaped structure, the plate-shaped part is perpendicular to the axial direction of the cylindrical part, and a stepped hole 1314 is formed in the cylindrical part for placing the extrusion block 135. Two arc-shaped convex edges are arranged on two sides of the front end of the outer edge of the cylindrical part in an outward protruding mode, and a groove for clamping the front end of the pen shell is formed between the convex edges. The tubular portion has a sixth through hole 1311 formed near the plate-like portion for insertion of the locking portion 1321 of the needle holder 132, and a seventh through hole seven for insertion of the first abutting portion 1331 of the needle holder 133 is formed on the opposite side of the sixth through hole 1311. A fourth projection 1312 is provided in a rearward projecting manner at a rear side edge position of the plate-like portion in a direction close to the sixth through hole 1311, for mounting a second mounting portion 1322 on the needle pulling bracket 132. At the other edge position of the rear side of the plate-like portion, in the direction of one side close to the through hole seven, a boss five 1313 is provided protruding rearward for mounting a mounting portion three 1332 on the needle insertion holder 133. At the other edge position of the rear side of the plate-like portion, a diagonal position of a fifth projection 1313 is provided with a sixth projection 1315 projecting rearward for abutment of an abutment portion two 1323 on the needle pulling holder 132.

The needle-drawing bracket 132 is made of a sheet-shaped metal material, the needle-drawing bracket 132 has a locking portion 1321, a second mounting portion 1322, a connecting portion and a second abutting portion 1323, the second mounting portion 1322 is formed by bending an end portion of the sheet-shaped metal material, the second mounting portion 1332 has a substantially annular structure, the connecting portion connects the second mounting portion 1322 and the locking portion 1321, and connects the locking portion 1321 and the second abutting portion 1323, and the locking portion 1321 is located at a substantially middle portion of the needle-drawing bracket. The connecting portion is outwardly arched or curved, so that the locking portion 1321 has a tendency to rebound after being pressed down. The locking part 1321 can lock the needle cap after being inserted into the through hole six 1311, so that the needle cap is convenient to separate from the inserting part on the liquid medicine cylinder. The locking portion 1321 is provided parallel to the plate-like portion, that is, the locking portion 1321 is perpendicular to the axial direction of the cylindrical portion.

The needle insertion holder 133 has a third mounting portion 1332, a first abutting portion 1331, a third abutting portion 1333, and a connecting portion, the needle insertion holder 133 is made of a sheet material of metal, and the third mounting portion 1332 is formed by bending an end portion of the sheet material, and has a substantially annular structure. The connecting part connects the mounting part III 1332 and the abutting part I1331, and connects the abutting part I1331 and the abutting part III 1333, and the abutting part I1331 is positioned at the approximately middle part of the needle insertion bracket. The connecting part is outwards arched or bent, so that the abutting part has a rebound tendency after the acting force is removed. The first abutting portion 1331 is of a sheet-shaped structure, the direction of the first abutting portion is parallel to the axial direction of the cylindrical portion, and the inner side end surface of the first abutting portion is inclined in a front-low rear-high manner. After the needle cap 19 enters the barrel frame, the outer wall of the outer needle cap in the needle cap 19 abuts against the inner end surface of the abutting part one 1331, and the abutting part is pushed outwards, so that the abutting part three 1333 of the end part of the needle inlet bracket triggers the sensor six 153.

The second spring 134 is a double torsion spring, one spring coil of the second spring is sleeved on the fourth boss 1312, and the end part of the second spring is connected with a connecting part on the needle pulling bracket 132; the other spring is sleeved on the fifth boss 1313, and the end part is connected with a connecting part on the needle feeding bracket 133. The second spring 134 can play a reset role on the needle pulling support and the needle inserting support.

The two extrusion blocks 135 are positioned on two opposite sides of the cylindrical part, the extrusion blocks are approximately arc-shaped, and the outer edges of the extrusion blocks are provided with inward concave arc-shaped grooves for limiting the installation of the rubber ring. The inner wall of the extrusion block 135 is in inclined transition, so that the auxiliary clamping effect on the needle cap is facilitated when the needle cap enters the cylinder frame.

Referring to fig. 3, 4 and 11, the second driving mechanism 14 includes a second motor 141, a worm 142 and a rack 143, and the second motor 141 is a direct current motor. The output shaft of the second motor is connected with a worm 142, the worm 142 is meshed with a rack 143, and the rack is fixedly arranged on a side plate one 1262 of the bracket three 126. The rear portion of the rack 143 has a sensor trigger portion 1431 protruding therefrom for triggering the second sensor 157 and the third sensor 158, so as to reflect the position of the rack 143, that is, the position of the third bracket 126, that is, the position of the cartridge, and also reflect the rotation angle of the worm 142, and reflect the driving condition of the second motor 142.

Referring to fig. 4, 5, 6, 7, 13 and 14, the sensing control unit 15 includes a circuit board 151, and an MCU (micro control unit), a first sensor 156, a second sensor 157, a third sensor 158, a fourth sensor 154, a fifth sensor 152, a sixth sensor 153, a seventh sensor 123, and necessary resistors, capacitors, etc. disposed on the circuit board 151.

The circuit board 151 has a smaller rear portion and a fork-shaped front portion, and the front portion is provided with two branches of different lengths, namely a longer first branch and a shorter second branch, and a gap 1511 is arranged between the first branch and the second branch, wherein the gap 1511 is used for accommodating the liquid medicine barrel 121. Referring to fig. 7 and 13, a fourth sensor 154 is disposed at the front end of the first branch for sensing whether the first branch contacts skin, and a sixth sensor 153 and a fifth sensor 152 are disposed on the first branch in sequence from front to back, where the sixth sensor 153 is used for sensing the abutting condition of the abutting portion three 1333 on the needle feeding bracket 133, and further sensing the position condition of the outer needle cap in the needle cap. The fifth sensor 152 is configured to sense a position of the first touch portion 1271 of the touch control 127, and further sense a position of an inner needle cap in the needle cap, that is, reflect whether the liquid medicine cartridge 121 moves in place, and reflect whether the insertion portion of the liquid medicine cartridge is inserted into the inner needle cap. Referring to fig. 4 and 14, a first sensor 156 is disposed at the rear end of the circuit board 151 and is used for sensing the displacement of the screw sleeve 113 in the first driving mechanism 11, the first sensor 156 is located on the moving path of the touch portion 1131 of the screw sleeve 113, and when the screw sleeve 113 moves to the rear end to the touch portion 1131 to trigger the first sensor 156, the screw sleeve 113 moves to the preset position. The second branch is provided with a third sensor 158 and a second sensor 157 from front to back, and the second sensor 157 and the third sensor 158 are used for sensing the position of a sensor triggering part 1431 of the rack 143 so as to perform lower limit and upper limit on the rack 143/the third bracket 126/the liquid medicine cartridge 121. On the circuit board on the side where the first branch is located, a USB interface 155 is provided for charging or data transfer. On the circuit board or pen shell, sound prompting element such as buzzer and circuit can be set. A sensor seven 123 is installed at the front end side of the cartridge 121 to sense whether the cartridge 129 is in place.

The sensing control unit 15 may further include an internet of things unit module, such as a bluetooth module, a 5G module, an NB-IOT module, a WIFI module, a GRPS module, etc., and the electronic injection pen may be incorporated into the internet of things.

A temperature sensor may be further included in the sensing control unit 15 to sense the temperature near the cartridge for determining whether an influence is exerted on the medical fluid.

Referring to fig. 4, 5, 6 and 15, the bottle changing switch assembly 16 includes a bottle changing button 161, a connecting frame 162, a third spring 163 and a fixing post 164, the bottle changing button 161 abuts against the connecting frame 162, the connecting frame 162 is mounted on the fixing post 164, and the third spring 163 is connected with the fixing post 164 and the connecting frame 162.

The bottle changing button 161 is rectangular, is mounted on the side surface of the pen shell, is positioned at the same front and back positions as the window 211, is positioned at the junction of the first shell and the second shell, and is provided with notches for mounting the bottle changing button 161 on the first shell 21 and the second shell 17. Taking fig. 15 as an example, the connecting frame 162 has a sheet structure, wherein one end of the inner side of the connecting frame is provided with a limiting boss 1623 in a protruding manner, and the outer end of the connecting frame extends outwards and is bent upwards to form an abutting portion four 1621. The connecting frame 162 is provided with a through hole eight 1622 at a position close to the limiting boss 1623 for being sleeved on the fixing column 164. The third spring 163 is a torsion spring, one end of which abuts against the limiting boss 1623, and the other end of which can be connected to the fixing post 164 or abuts against the first mounting portion 214 of the first housing 21. The fixing post 164 is mounted on the first mounting portion 214 or integrally formed in the first mounting portion 214.

Referring to fig. 16 and 17, when the drug solution cartridge 121 is opened, the cartridge 129 can be replaced. The screw sleeve 113 in the first driving mechanism 11 and the liquid medicine cylinder 121 in the liquid medicine cylinder assembly 12 are positioned on the same axis, so that the clamping type bottle 129 in the liquid medicine cylinder 121 can be conveniently pushed in a straight line. The second driving mechanism is positioned at the side of the liquid medicine cartridge assembly 12, and through the cooperation of the worm and the rack in the second driving mechanism, the rotation motion is converted into the linear motion of the rack, and the liquid medicine cartridge assembly is pushed to linearly move.

The control principle and the step method of the electronic injection pen of the present invention are as follows, referring to fig. 18 and 19.

In fig. 18, MCU (Microcontroller Unit) is a micro-control unit, or referred to as a single-chip microcomputer, connected with a memory (EEPROM), and the MCU performs unified coordination control on each component or module, and a position switch (sensor). The battery cell 24 is a rechargeable lithium battery and a battery protection module. The first sensor, the second sensor, the third sensor, and the fifth to seventh sensors are all substantially position switches for sensing position information of the corresponding components. And sensor four 154 is a tactile sensor that senses whether there is skin touch. The display unit 22 may be an OLED screen and related circuits, and an OLED (Organic Light-Emitting Diode) is an Organic Light-Emitting Diode, and is also connected to the MCU.

The membrane button is electrically connected to the MCU and can send a control signal to the MCU. The MCU is connected with the buzzer, and the buzzer can be controlled to carry out voice prompt. The MCU controls the second motor through the second motor driving module. The first motor is driven by the first motor driving module. The MCU is also connected with a real-time clock circuit (RTC), and the RTC can provide stable clock signals for the MCU so as to realize accurate control.

The USB interface is connected with the MCU through a USB-to-TTL module, and can be connected with an upper computer. The level logic of the communication interface of the singlechip is different from the level logic of the communication interface of the upper computer such as a PC, the communication interface on the PC is provided with a USB interface, and the corresponding level logic conforms to the USB principle; serial communication on the singlechip is carried out through RXD, TXD, VCC, GND four pins of the singlechip, and corresponding level logic complies with the TTL principle. The USB-to-TTL module is used for converting the level into a level which can be identified by both parties for communication.

The upper computer can also communicate with the MCU through a Bluetooth low energy module (BLE). The upper computer is not limited to a PC, a tablet personal computer, a mobile phone and the like.

The control steps of the injection pen are shown in fig. 19, and specifically mainly include the following steps.

(1) Initializing;

The first motor 111 drives the screw rod 112 to rotate reversely, when the touch control part 1131 on the screw sleeve 113 touches the first motor position switch, namely the sensor I156, the first motor 111 stops rotating, and the default position is the reference position of the first motor 111;

the second motor 141 drives the worm 142 to rotate forward, so that the rack 143 and the third bracket 126 move backward, and when the sensor trigger part 1431 on the rack 143 touches the second motor position switch, namely the second sensor 157, the second motor 141 stops rotating, and the position is considered as the maximum distance position where the second motor 141 drives the third bracket 126 to move backward;

(2) Starting up;

after the MCU is electrified, all peripheral equipment is closed, a power key is turned on to interrupt, and a power-saving sleep mode is entered. When the power button is pressed, an interrupt is triggered, and the sleep mode is exited. Detecting a USB interface, converting into a communication mode if the USB is accessed, and charging a battery; if USB is not connected, the battery voltage is detected. Restarting to enter a sleep mode if the battery voltage is low; if the battery voltage is sufficient, the peripheral is initialized, the OLED, i.e., display unit 22, is turned on, and the operating mode is entered.

(3) Data communication;

including but not limited to USB and BLE modes of communication. The intelligent equipment such as a PC (personal computer) and a mobile phone can be connected with the injector to read the record and the setting parameters of the injector.

(4) A dressing change process;

when the bottle changing button 16 is pressed, the first spring 128 ejects the medicine cartridge 121 and the cap 18 together, and the medicine bottle for injection (i.e., the clip type bottle 129) is manually put into the medicine cartridge 121, and the cap 18 is pressed down to reset the medicine cartridge 121 and the cap 18, thereby completing the medicine changing process.

(5) A pin inserting flow;

the needle cap 19 (including the outer needle cap and the inner needle cap) is manually inserted, the outer needle cap position switch, i.e., the sensor six 153 (in other embodiments, the sensor eight 136) is triggered, the second motor 141 starts to drive the worm 142 to rotate, and the medicine cartridge 121 is pushed forward until the needle cap is inserted into the inner needle cap, and after the sensor triggering portion 1431 touches the sensor 158, the medicine cartridge is pushed into the inner needle cap. After the second motor 141 drives the worm 142 to rotate reversely to enable the sensor trigger part 1431 to touch the sensor two 157, the internal needle cap position switch, namely the sensor five 152, is triggered, which indicates that the liquid medicine cylinder has brought the internal needle cap with the needle out of the external needle cap and retracted into the pen, the OLED display unit displays that the contact pin is completed, and the buzzer sends out prompt tones.

(6) An exhaust flow;

the first motor 111 drives the screw rod 112 to rotate, the screw sleeve 113 is pushed forward, after the front end of the screw sleeve 113 on the screw rod 112 contacts with the piston in the clamp bottle 129, the clamp bottle 129 is propped against the front end of the liquid medicine cylinder 121, the piston position switch, namely the sensor seven 123, is triggered, the first motor 111 stops rotating after a certain number of steps, the piston in the clamp bottle 129 receives a certain pressure, and air in the needle is discharged, so that the exhausting function is completed.

(7) Injecting by one key;

the pen point is pressed on the injection position, the injection button in the film button is pressed, the MCU reads the state of the sensor IV 154, after judging that the pen contacts the skin, the second motor 141 starts to drive the worm 142 to rotate, the liquid medicine cylinder 121 is pushed forward, and simultaneously, the needle on the liquid medicine cylinder 121 is inserted into the skin, so that the automatic needle inserting function is completed. The first motor 111 drives the screw rod 112 to rotate, the screw sleeve 113 is pushed forward, and the liquid medicine in the clip bottle 129 is injected into the body. The set injection dose is converted into the rotation step number of the first motor, and when the rotation of the first motor 111 reaches the appointed step number, the first motor 111 reverses the appointed step number to loosen the pressure on the piston in the medicine bottle. After the medicine liquid is fully diffused in the body, the second motor 141 drives the worm 112 to reversely rotate, the needle is pulled out of the skin and is retracted into the injection pen, the OLED display unit 22 displays that the injection is finished, and the buzzer sends out a prompt tone.

(8) A needle pulling process;

the outer needle cap is manually inserted, the outer needle cap position switch, namely the sensor six 153 (the sensor eight 136 in other embodiments) is triggered, the second motor 141 starts to drive the worm 142 to rotate, the liquid medicine cylinder 121 is pushed forward until the inner needle cap is inserted into the outer needle cap, the OLED display unit displays needle pulling, and the buzzer gives out a prompt tone. The needle pulling button 25 is manually pressed, the locking part 1321 on the needle pulling bracket 132 is embedded into the joint of the inner needle cap and the liquid medicine cylinder, the second motor 141 drives the worm 142 to reversely rotate, the liquid medicine cylinder 121 is retracted into the pen, the inner needle cap with the needle is blocked by the locking part 1321 and is not retracted in the outer needle cap, the OLED display unit displays that the needle pulling is completed, and the buzzer sends out a prompt tone.

(9) Setting a flow;

and switching the display menu through the setting on the film button, and adjusting the numerical value through the up-down key. Menu content includes, but is not limited to, the following:

a) Battery power and state of charge;

b) A residual dose;

c) Setting injection dose;

d) Real-time temperature;

e) Injection recording;

f) Setting date and time;

g) Bluetooth connection status.

Example 2

In this embodiment, the first driving mechanism 11 of the electronic injection pen may be a linear motor, an electronic push rod, or the like, and may be a linear stepping motor instead of the mode that an exposed rotating screw rod is matched with a screw sleeve that operates linearly, that is, the mode that an exposed output shaft itself can move linearly, or the like, so long as a motor capable of switching at least two speeds is provided.

If the first driving mechanism 11 includes a first motor, a screw and a threaded sleeve (nut), the output shaft of the first motor is connected with the threaded sleeve, the threaded sleeve has an internal thread, the screw is in threaded connection with the threaded sleeve, the first motor is a stepping motor, and a guiding mechanism (such as a guiding block or a guiding groove) can be arranged to guide the screw, so that the screw can linearly move under the action of the threaded sleeve. Other shapes, structures, principles may be the same as those in the step and embodiment 1, and will not be described again.

Example 3

In this embodiment, referring to fig. 20 and 21, the second driving mechanism 14 includes a second motor 141, a screw 144 and a nut 145, and the second motor 141 is a dc motor. The output shaft of the second motor is connected with a screw rod 144, the screw rod 144 is in threaded connection with a first nut 145, specifically, an external thread on the screw rod 144 is in threaded connection with an internal thread on the first nut 145, and the first nut 145 is fixedly arranged on a third bracket 126 on the liquid medicine cylinder assembly. One end of the first nut 145 fixed on the third bracket 126 is provided with a protruding part, and the third bracket 126 is provided with a through hole at the fixing position for clamping and fixing the protruding part. The third bracket 126 is provided with a sensor triggering part for triggering the second sensor and the third sensor in a protruding manner.

The liquid medicine cartridge assembly comprises a liquid medicine cartridge, a guide rod, a third support 126, a touch control 127 and a first spring, wherein the liquid medicine cartridge is hinged to the third support 126, the first spring is connected with the liquid medicine cartridge and the third support, the touch control 127 is hinged to the liquid medicine cartridge, the third support 126 is movably mounted on the guide rod, and the guide rod is mounted on the pen shell.

The fixed column 164 in the change-bottle switch assembly is mounted/threaded on the third bracket 126.

The needle cap 19 includes an outer needle cap 192 and an inner needle cap 191.

Referring to fig. 22 to 25, the needle changing mechanism includes a barrel frame and a needle pulling support 132, the needle pulling support 132 is made of a metal sheet material and is L-shaped, the needle pulling support 132 is mounted on a needle pulling button 25, and a second spring 134 is connected between the needle pulling support 132 or the needle pulling button 25 and the barrel frame. Specifically, the needle pulling support 132 is detachably connected to the needle pulling button 25, two ends of the needle pulling button 25 can respectively abut against or connect with the second spring 134, and the second spring 134 is a compression spring in this embodiment, and is used for resetting the needle pulling button 25 to drive the needle pulling support 132 to reset. The barrel frame of the needle changing mechanism can be provided with a notch for installing a sensor eight 136, and the sensor eight 136 can replace the sensor six 153 in the embodiment 1 and is used for sensing whether the outer needle cap 192 in the needle cap 19 is inserted or not. The structure of the sensor eight 136 may be the same as that of the sensor seven 123 in embodiment 1.

The cylinder wall at the rear part of the liquid medicine cylinder is provided with a concave part 1210, the concave part 1210 can be a through hole or a groove, a boss 1212 is convexly arranged on the cylinder wall of the liquid medicine cylinder towards the space of the concave part in the concave part 1210, so as to be used for abutting against a limit convex part in the bottle changing switch assembly. The wall of the other side of the front part of the liquid medicine cartridge is provided with a hinge lug 1274, in this embodiment, the first bracket 122 is not required, and the liquid medicine cartridge is hinged with the third bracket 126. The touch piece 127 has a hinge 1274 thereon to hinge onto the hinge ear 1274. The third bracket is provided with a limiting frame 1265 for limiting the touch control 127.

Other shapes, structures, principles may be the same as those in the step and embodiment 1, and will not be described again.

The present invention is not limited to the above embodiments, but is capable of modification and variation in all aspects, including those of ordinary skill in the art, without departing from the spirit and scope of the present invention.

Claims

1. An electronic injection pen, comprising: the pen comprises a pen shell, a first driving mechanism (11), a liquid medicine barrel assembly (12), a needle changing mechanism (13), a second driving mechanism (14), a sensing control unit (15), a bottle changing switch assembly (16) and a battery unit (24), wherein the mechanisms, the assemblies and the units are all arranged in an inner cavity of the pen shell, the needle changing mechanism (13) is positioned at the front end of the pen shell, the liquid medicine barrel assembly (12) is positioned at the rear side of the needle changing mechanism (13), the first driving mechanism (11) is positioned at the rear side of the liquid medicine barrel assembly (12), the sensing control unit (15) is connected with the first driving mechanism (11), the second driving mechanism (14) and the battery unit (24), the battery unit (24) supplies power to the sensing control unit (15), the first driving mechanism (11) and the second driving mechanism (14), the first driving mechanism (11) can act on a piston of a clamp type bottle (129) in the liquid medicine barrel assembly (12), and the second driving mechanism (14) is connected with the liquid medicine barrel assembly (12) to drive the liquid medicine barrel assembly (12) to move forwards and backwards;

The first drive mechanism (11) has at least,

a first drive speed for rapid venting of the cartridge (129) prior to injection; the method comprises the steps of,

a second drive speed for advancing the plunger within the cartridge (129) during injection to complete the injection; the first drive speed is greater than the second drive speed.

2. The electronic injection pen according to claim 1, wherein the first driving mechanism (11) comprises a first motor (111), a screw rod (112) and a screw sleeve (113), an output shaft of the first motor (111) is connected with the screw rod (112), the screw sleeve (113) is provided with internal threads and is in threaded connection with the screw rod (112), and the first motor (111) is a stepping motor; or, the first driving mechanism (11) comprises a first motor, a screw rod and a threaded sleeve, an output shaft of the first motor is connected with the threaded sleeve, the threaded sleeve is provided with internal threads, the screw rod is in threaded connection with the threaded sleeve, and the first motor is a stepping motor.

3. The electronic injection pen according to claim 2, wherein the screw sleeve (113) is provided with a guide block (1133) or a guide groove, and the pen shell is provided with a guide groove (216) or a guide block which is matched with the guide block (1133) or the guide groove for the screw sleeve (113) to move linearly.

4. The electronic injection pen according to claim 1, wherein the second driving mechanism (14) comprises a second motor (141), a worm (142) and a rack (143), the output shaft of the second motor (141) is connected with the worm (142), the worm (142) is meshed with the rack (143), and the rack (143) is fixedly mounted on the liquid medicine barrel assembly (12); or, the second driving mechanism (14) comprises a second motor (141), a screw rod (144) and a first nut (145), the output shaft of the second motor is connected with the screw rod (144), the screw rod (144) is in threaded connection with the first nut (145), and the first nut (145) is fixedly arranged on the liquid medicine cylinder assembly.

5. The electronic injection pen of claim 4, wherein the cartridge assembly (12) comprises a cartridge (121), a first bracket (122), a guide rod (125), a third bracket (126), a touch control (127) and a first spring (128), wherein the front part of the cartridge (121) is hinged to the third bracket (126) through the first bracket (122), the third bracket (126) is movably mounted on the guide rod (125), the guide rod (125) is mounted on the pen shell, the touch control (127) is mounted on the first bracket (122), and the first spring (128) is connected to the cartridge (121) and the third bracket (126); or, the liquid medicine barrel assembly comprises a liquid medicine barrel, a guide rod, a third support (126), a touch control piece (127) and a first spring, wherein the liquid medicine barrel is hinged to the third support (126), the first spring is connected with the liquid medicine barrel and the third support, the touch control piece (127) is hinged to the liquid medicine barrel, the third support (126) is movably mounted on the guide rod, and the guide rod is mounted on the pen shell.

6. The electronic injection pen according to claim 5, wherein the bottle changing switch assembly (16) comprises a bottle changing button (161), a connecting frame (162), a third spring (163) and a fixing post (164), the bottle changing button (161) is abutted against the connecting frame (162), the connecting frame (162) is mounted on the fixing post (164) and can be used for locking and unlocking the liquid medicine barrel (121), the fixing post (164) is mounted on a pen shell or integrally formed on the pen shell or mounted on the third bracket (126), and the third spring (163) is connected with the fixing post (164) and the connecting frame (162).

7. The electronic injection pen according to claim 5, wherein the needle cap (19) comprises an outer needle cap and an inner needle cap, the needle is fixed on the inner needle cap, the outer needle cap is sleeved on the inner needle cap, the inner needle cap can be inserted on the liquid medicine cylinder, the needle changing mechanism (13) comprises a cylinder frame (131), a needle pulling support (132) and a needle inserting support (133), the needle pulling support (132) and the needle inserting support (133) are both arranged on the cylinder frame (131), and a second spring (134) is connected between the needle pulling support (132) and the needle inserting support (133); or the needle changing mechanism comprises a cylinder frame and a needle pulling support (132), the needle pulling support (132) is arranged on a needle pulling button (25), and a second spring (134) is connected between the needle pulling support (132) or the needle pulling button (25) and the cylinder frame; when the needle is pulled out, the clamping part (1321) on the needle pulling support (132) is embedded into the joint of the inner needle cap and the liquid medicine cylinder, the second motor (141) drives the worm (142) to reversely rotate, the liquid medicine cylinder is retracted into the pen, the inner needle cap with the needle head is blocked by the clamping part (1321), and the needle pulling is completed without retraction in the outer needle cap.

8. The electronic injection pen according to claim 7, wherein the sensing control unit (15) includes a circuit board (151), and a micro control unit provided on the circuit board (151), a first sensor (156) for sensing positional information of the first driving mechanism (11), a second sensor (157) for sensing limit positional information of the rearward movement of the cartridge assembly (12), a third sensor (158) for sensing limit positional information of the forward movement of the cartridge assembly (12), a fourth sensor (154) for sensing whether or not the cartridge is in contact with the skin, a fifth sensor (152) for sensing positional information of the inner cartridge and the cartridge in the cartridge (19), and a sixth sensor (153) or an eighth sensor (136) for sensing positional information of the outer cartridge in the cartridge (19), each of which are connected to the micro control unit.

9. The electronic injection pen according to any one of claims 1-4, further comprising a display unit (22), wherein the display unit is connected to the sensing control unit (15), a window (211) for displaying by the display unit (22) is formed in the pen shell, and a USB interface or/and a bluetooth module is further arranged in the sensing control unit (15).