CN110743064A

CN110743064A - Electronic injection pen

Info

Publication number: CN110743064A
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: 2020-02-04
Anticipated expiration: 2039-11-15
Also published as: CN110743064B

Abstract

The invention discloses an electronic injection pen, comprising: the pen comprises a pen shell, a first driving mechanism, a liquid medicine barrel assembly, a needle changing mechanism, a second driving mechanism, a sensing control unit, a bottle changing switch assembly and a battery unit, wherein all the mechanisms, the assemblies and the units are installed in an inner cavity of the pen shell, the needle changing mechanism is arranged at the front end of the pen shell, the liquid medicine barrel assembly is arranged at the rear side of the needle changing mechanism, the first driving mechanism is arranged at the rear side of the liquid medicine barrel assembly, the sensing control unit is connected with the first driving mechanism, the second driving mechanism and the battery unit, the battery unit supplies power to the sensing control unit, the first driving mechanism and the second driving mechanism, the first driving mechanism can act on a piston of a clamping type bottle in the liquid medicine barrel assembly, and the second driving mechanism is connected with the liquid medicine barrel assembly to drive the liquid medicine barrel assembly to move back and. The electronic injection pen disclosed by the invention adopts the double driving mechanisms, and the two driving mechanisms respectively act independently without mutual influence. Each part cooperation, intelligence is convenient can be controld to the sensing control unit.

Description

Electronic injection pen

Technical Field

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

Background

The existing electronic injection pen generally has only one direct current motor, and usually has the following problems: prior to injection, the needle needs to be manually inserted into the skin, causing great psychological stress on the patient; because the same motor is used for air exhaust and injection, the air exhaust speed is consistent with the injection speed, and the longest time of several minutes is needed for completing one air exhaust; the needle head needs to be installed and pulled out manually, and is easy to be pricked to the skin by mistake in the plugging and pulling process; during injection, the injection speed is constant, and the injection cannot be performed according to a curve (such as slow injection first and then constant speed injection); 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 the direct current motor. However, the injection pen with two motors is adopted, the two driving motors are usually connected, or the position layout is unreasonable, which is not beneficial to popularization and use.

Disclosure of Invention

The invention relates to an electronic injection pen, which adopts a dual-drive mechanism, and the two dual-drive 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: the pen comprises a pen shell, a first driving mechanism, a liquid medicine barrel assembly, a needle changing mechanism, a second driving mechanism, a sensing control unit, a bottle changing switch assembly and a battery unit, wherein all the mechanisms, the assemblies and the units are installed in an inner cavity of the pen shell, the needle changing mechanism is arranged at the front end of the pen shell, the liquid medicine barrel assembly is arranged on the rear side of the needle changing mechanism, the first driving mechanism is arranged on the rear side of the liquid medicine barrel assembly, the sensing control unit is connected with the first driving mechanism, the second driving mechanism and the battery unit, the battery unit supplies power to the sensing control unit, the first driving mechanism and the second driving mechanism, the first driving mechanism can act on a piston of a clamping type bottle in the liquid medicine barrel assembly, and the second driving mechanism is connected with the liquid medicine barrel assembly to drive the liquid medicine barrel assembly to move back and forth.

By adopting the technical scheme, the dual-drive mechanism is utilized, the first drive mechanism can exhaust and inject, the second drive mechanism can drive the liquid medicine barrel assembly to move back and forth, the needle head can be driven to penetrate into and be discharged out of the skin, the needle head does not need to be manually penetrated, the first drive mechanism and the second drive mechanism respectively independently act, no direct connection relation on a physical instrument exists between the first drive mechanism and the second drive mechanism, the first drive mechanism cannot be driven together when the second drive mechanism drives the liquid medicine barrel assembly to move back and forth, and the respective actions of the two drive mechanisms cannot influence the corresponding party. The needle changing mechanism can clamp the needle cap, so that the needle cap can be conveniently taken down and replaced. Each subassembly, mechanism and unit coordination action of sensing control unit steerable, it is intelligent convenient, be favorable to promoting. And the first driving mechanism is positioned at the rear side of the liquid medicine barrel assembly, so that the first driving mechanism, the liquid medicine barrel assembly and the needle changing mechanism are positioned on the same axis, the first driving mechanism is favorable for stably and smoothly propelling a piston in a cartridge bottle in the liquid medicine barrel assembly, and the injection or the exhaust is stable, efficient and safe. The whole pen shell is longer based on the design, and is beneficial to holding by hands to carry out stable operation.

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

a first drive speed for rapidly venting the cartridge bottle prior to injection; and the number of the first and second groups,

the second driving speed is used for pushing the piston in the clamping type bottle to complete injection during 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 speed at least for exhaust before the injection is different with the speed when injecting, and first drive speed is greater than second drive speed, can realize high-efficient exhaust, injects the most rationally, improves whole injection quality and efficiency. Of course, during injection, the curve change of the injection speed can be realized according to related parameters, the requirements of a patient on a human body are met, and intelligent injection is realized.

As a further improvement of the present invention, the first driving mechanism includes a first motor, a lead screw and a threaded sleeve, an output shaft of the first motor is connected with the lead screw, the threaded sleeve has internal threads and is connected to the lead screw in a threaded manner, and the first motor is a step motor; or, first actuating mechanism includes first motor, screw rod and screw sleeve, and the output shaft of first motor connects the screw sleeve, and the screw sleeve has the internal thread, and screw rod threaded connection is on the screw sleeve, and first motor is step motor. By adopting the technical scheme, the first motor adopts the stepping motor, the rotating speed and the position of the motor can be accurately controlled, a proper pulse signal is added, the motor can rotate at a certain angle (called a stepping angle), and the rotating speed is in direct proportion to the pulse frequency. By controlling the pulse signal, the ordered regulation of each speed can be realized, the exhaust can be rapidly carried out, the injection speed can be controlled and changed in the injection process, and the medical requirement can be better met.

As a further improvement of the invention, the threaded 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 which is matched with the guide block or the guide groove and used for the threaded sleeve to move linearly. By adopting the technical scheme, the arrangement of the guide block or the guide is beneficial to enabling the screw sleeve to move according to a preset linear track, so that the piston in the clamping type bottle is smoothly pushed.

As a further improvement of the invention, the second driving mechanism comprises a second motor, a worm and a rack, 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 barrel 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 installed on the liquid medicine barrel assembly. Through adopting above-mentioned technical scheme, the second motor can drive the worm and rotate among the second actuating mechanism, and the cooperation of worm and rack can be with rotary motion conversion linear motion to make rack rectilinear motion, make liquid medicine cartridge subassembly rectilinear motion.

As a further improvement of the invention, the liquid medicine barrel assembly comprises a liquid medicine barrel, a first support, a guide rod, a third support, a touch control piece and a first spring, the front part of the liquid medicine barrel is hinged to the third support through the first support, the third support 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 support, and the first spring is connected with the liquid medicine barrel and the third support; or the liquid medicine barrel assembly comprises a liquid medicine barrel, a guide rod, a third support, a touch control piece and a first spring, the liquid medicine barrel is hinged to the third support, the first spring is connected with the liquid medicine barrel and the third support, the touch control piece is hinged to the liquid medicine barrel, the third support is movably installed on the guide rod, and the guide rod is installed 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 articulate the liquid medicine section of thick bamboo on support three, and the touch-control piece is installed on support one, can be used to trigger sensor. The first spring connects the liquid medicine barrel and the third support, and can be used for bouncing the liquid medicine barrel and the third support around the hinged position, so that the clamping type bottle is convenient to replace.

As a further improvement of the present invention, the bottle changing switch assembly includes a bottle changing button, a connecting frame, a third spring and a fixing column, the bottle changing button abuts against the connecting frame, the connecting frame is mounted on the fixing column and can be used for locking and unlocking the liquid medicine cartridge, the fixing column is mounted on the pen shell or integrally formed on the pen shell or mounted on the third bracket, and the third spring is connected with the fixing column and the connecting frame. Through adopting above-mentioned technical scheme, trade the setting of each part among the bottle switch module for press this and trade a button, can act on the link, and then drive the link and remove, in order to relieve the locking to the liquid medicine section of thick bamboo, the liquid medicine section of thick bamboo pops out, in order to change the card formula bottle, convenient high efficiency.

As a further improvement of the invention, the needle changing mechanism comprises a barrel 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 barrel frame, and a spring II is connected between the needle pulling support and the needle inserting support; or the needle changing mechanism comprises a barrel frame and a needle pulling support, the needle pulling support is arranged on the first needle pulling button, and a second spring is connected between the needle pulling support or the needle pulling button and the barrel frame. Through adopting above-mentioned technical scheme, the creel can carry out the supplementary clamping action of certain degree to the needle cap in the mechanism of trading the needle, and the front end of the liquid medicine section of thick bamboo of being convenient for is inserted in the needle cap, pulls out the needle support and after the injection, can be used to block 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, is called as pulling out the needle promptly. When the needle cap is plugged into the barrel frame, the needle cap touches the needle inserting support, and the needle inserting support triggers a corresponding sensor to indicate that the needle cap is inserted. In other solutions, i.e. solutions without a needle holder, the needle sensor is touched after the needle cap is inserted into the cartridge holder to indicate the insertion of the needle cap.

As a further improvement of the present invention, the sensing control unit comprises a circuit board, and a micro control unit disposed on the circuit board, a first sensor for sensing position information of the first driving mechanism, a second sensor for sensing extreme position information of the backward movement of the medical fluid cylinder assembly, a third sensor for sensing extreme position information of the forward movement of the medical fluid cylinder assembly, a fourth sensor for sensing whether to contact skin, a fifth sensor for sensing relative position information of the inner needle cap and the medical fluid cylinder in the needle cap (i.e. sensing whether the inner needle cap is inserted on the medical fluid cylinder), and a sixth or eighth sensor for sensing 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 above technical scheme, the micro control unit in the sensing control unit can control to execute corresponding actions according to signals measured by each sensor, automatic and efficient.

As a further improvement of the invention, the pen further 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 are/is further arranged in the sensing control unit. Through adopting above-mentioned technical scheme, display element is favorable to showing this electric relevant information of injection pen, like battery power and charged state, remaining dose, injection dose setting, real-time temperature, injection record, date time setting, bluetooth connection state etc. improve visual and degree of automation. 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) pulling the needle by one key: the needle can be pulled out automatically only by pressing the button once at most;

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

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

(4) the whole process of a series of processes of needle inserting, air exhausting, needle inserting, injection, needle withdrawing and needle pulling is hidden, so that the 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 beneficial to holding by hands.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

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

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

fig. 3 is an exploded schematic view of an electronic injection pen provided in embodiment 1 of the present invention;

FIG. 4 is an enlarged view of FIG. 3 at I;

fig. 5 is another exploded schematic view of an electronic injection pen provided in 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 view at II in FIG. 6;

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

fig. 9 is a schematic structural view of a 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 medical fluid cartridge assembly and a second driving mechanism of an electronic injection pen according to embodiment 1 of the present invention;

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

fig. 13 is a schematic structural 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 angular configuration of the sensing and control unit of FIG. 13;

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

fig. 16 is a schematic structural diagram of an electronic injection pen according to embodiment 1 of the present invention during a bottle replacement;

fig. 17 is an exploded schematic view of an electronic injection pen according to embodiment 1 of the present invention during changing a bottle;

fig. 18 is a control schematic block diagram of an electronic injection pen provided in embodiment 1 of the present invention;

fig. 19 is a block diagram illustrating a procedure for using the electronic injection pen according to embodiment 1 of the present invention;

fig. 20 is an exploded view of an electronic injection pen according to embodiment 3 of the present invention;

FIG. 21 is an enlarged view at III of FIG. 20;

fig. 22 is a schematic diagram of an alternative angle explosion structure of the electronic injection pen according to embodiment 3 of the present invention;

FIG. 23 is an enlarged view of FIG. 22 at IV;

fig. 24 is a schematic structural view of a liquid medicine cartridge of an electronic injection pen provided in embodiment 3 of the present invention;

fig. 25 is another angle structure diagram of a liquid medicine cartridge of an electronic injection pen provided in embodiment 3 of the present invention.

In the figure: the first driving mechanism 11, the first motor 111, the lead screw 112, the threaded sleeve 113, the guide block 1133, the flange 1132, the touch control part 1131, the liquid medicine cylinder assembly 12, the liquid medicine cylinder 121, the recess 1210, the clamping table 1211, the boss 1212, the first hole 1213, the second boss 1214, the first through hole 1215, the third boss 1216, the second through hole 1217, the third through hole 1218, the first support 122, the first boss 1221, the support 1222, the limiting part 1223, the seventh sensor 123, the second support 124, the guide rod 125, the third support 126, the bottom plate 1261, the first side plate 1262, the fourth through hole 12621, the second side plate 1263, the front plate 1264, the fifth through hole 12641, the limiting frame 1265, the touch control part 127, the first touch control part 1271, the mounting part 1272, the second touch control part 1273, the ear 1274, the first spring 128, the clamping bottle 129, the needle changing mechanism 13, the cylinder frame 131, the sixth through hole 1312, the fifth boss 1313, the mounting part 1323, the stepped hole 1314, the needle support 132, the second needle inserting part 1323, the needle inserting part 132, The first abutting portion 1331, the third mounting portion 1332, the third abutting portion 1333, the second spring 134, the extrusion block 135, the eighth sensor 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 first nut 145, the sensing control unit 15, the circuit board 151, the notch 1511, the fifth sensor 152, the sixth sensor 153, the fourth sensor 154, the first sensor 156, the second sensor 157, the third sensor 158, the bottle change switch assembly 16, the bottle change button 161, the connecting frame 162, the fourth abutting portion 1621, the eighth through hole 1622, the limit protrusion 1623, the third spring 163, the fixed column 164, the second housing 17, the through hole 171 for changing the cylinder, the mounting lug 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 needle button 213, the first mounting portion 214, the mounting portion 215, the mounting, Guide groove 216, display element 22, waterproof circle 23, battery unit 24, pull out needle button 25.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the preferred embodiments, structures, features and effects according to the present invention will be provided in the accompanying drawings.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the indicated orientations and positional relationships based on the orientation or positional relationship illustrated in the drawings, merely to facilitate description of the application and to simplify description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly 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 application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

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

In the present application, a stepping motor is an open-loop control element stepping motor element that converts an electrical pulse signal into an angular or linear displacement. In the non-overload condition, the rotation speed and stop position of the motor only depend on the frequency and pulse number of the pulse signal, and are not influenced by the load change, when the stepping driver receives a pulse signal, the stepping driver drives the stepping motor to rotate by a fixed angle in a set direction, namely a stepping angle, and the rotation of the stepping motor is operated by one step at the 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 rotating 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 the accurate control of the rotating speed and the position of the motor, and errors are not accumulated. The rotation direction can be conveniently changed by changing the sequence of the pulse. The stepping motor can normally operate at low speed.

In the present application, a dc motor refers to an electric motor that converts dc electric energy into mechanical energy.

Example 1

An electronic injection pen is disclosed, as shown in fig. 1 to 17, and includes a pen shell, a first driving mechanism 11, a liquid medicine cartridge 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 each mechanism, assembly and unit is installed in an inner cavity of the pen shell, the needle changing mechanism 13 is located at the front end of the injection pen, the liquid medicine cartridge assembly 12 is located at the rear side of the needle changing mechanism 13, the first driving mechanism 11 is located at the rear side of the liquid medicine cartridge assembly 12, the battery unit 24 is located 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 each driving mechanism. First actuating mechanism 11, liquid medicine section of thick bamboo subassembly 12 and trade needle mechanism 13 are in same axis, and battery unit 24 also is in on this axis and be located the rear end, compact structure, and is rationally distributed, is favorable to first actuating mechanism 11 to carry out stable smooth and easy propulsion to the piston in the cassette bottle 129 in the liquid medicine section of thick bamboo subassembly 12 for injection or the steady high efficiency and safety of exhaust.

Referring to fig. 1 to 7, the rear portion of the pen casing is reduced in an inward arc shape, the pen casing is smaller in size, the front portion of the pen casing is expanded in an outward arc shape, the pen casing is larger in size, and the pen casing is roughly fish-shaped as a whole. The pen shell comprises a first shell 21 and a second shell 17, the first shell and the second shell are fixed through fasteners after being covered, 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 formed with a window 211 for displaying on the display unit 22, the first case 21 is formed with a film button mounting portion 212 in front of the window 211, the film button mounting portion 212 may be a recess recessed inward for mounting the film button, the first case 21 is formed with a needle removing button mounting portion 213 in front of the film button mounting portion 212, the needle removing button mounting portion 213 may be a through hole, and the needle removing button 25 is mounted at the through hole and may act on a clamping portion 1321 of the needle removing bracket 132. The front end of the first shell 21 has a step part with a reduced size, and the step part can be used for a plug-in buckle of the pen cap 20, so that when the pen cap is buckled on the step part, the surface of the pen cap and the surface of the first shell 21 are in smooth transition. 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, and the guide block 1133 of the screw sleeve 113 in the first driving mechanism 11 is guided; a first mounting portion 214 with a protruding cylindrical structure is disposed on the inner side of the first housing 21 and at the rear side of the window 211, and is used for mounting the fixing post 164 in the bottle-changing switch assembly 16. A protruding support plate 215 is provided at a front portion of the inside of the first housing 21 in front of the window 211, a through hole is formed in the support plate 215, and a guide rod 125 in the supply liquid cartridge assembly 12 is installed. The second casing 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 mounted on the mounting lug 172 at the inner side of the second casing 17, so that the cylinder cover 18 can rotate conveniently, and the cylinder cover 18 can seal the cylinder changing through hole 171. The first shell 21 and the second shell 17 cover the inner space formed by closing, namely the inner cavity of the pen shell, so as to be used for installing various mechanisms and components.

The first driving mechanism 11, referring to fig. 3, 5 and 8, includes a first motor 111, a screw rod 112 and a threaded sleeve 113, the screw rod 112 is an output end of the first motor 111, and the screw rod 112 is linear. The first motor 111 is a stepping motor, and the first motor 111 can control the rotation speed and the angle of the lead screw 112, so that the lead screw 112 can rotate at different speeds, and the threaded sleeve 113 can move at different speeds. For example, during the process of evacuating the interior of the vial 129, a first drive rate is used which is relatively fast to accomplish the evacuation quickly, while during the process of injecting the drug solution into the patient, a second drive rate is used which is relatively slow to meet the injection requirements. And during actual injection, the second driving speed can be adjusted in a curve manner so as to meet the requirements of a human body and ensure the injection efficacy. The threaded sleeve 113 is provided with internal threads and is sleeved on the screw rod 112, and the internal threads on the threaded 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, the guide block 1133 can be arranged 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 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 between the other end of the screw sleeve 113 and the piston in the cassette bottle 129 is increased, and the piston is conveniently and stably pushed.

The drug solution cartridge assembly 12, referring to fig. 3, 5, 9 and 10, includes a drug solution cartridge 121, a first bracket 122, a second bracket 124, a guide rod 125, a third bracket 126, a touch member 127 and a first spring 128. The front part of the liquid medicine barrel 121 is hinged to a third support 126 through a first support 122, the third support 126 is installed on a guide rod 125, a cassette bottle 129 can be placed in the liquid medicine barrel 121, a seventh sensor 123 is installed on the side part of the front end of the liquid medicine barrel 121 and used for sensing whether the cassette bottle 129 is in place, and a second support 124 is installed at the front end of the liquid medicine barrel 121 in a buckling mode. The trigger member 127 is mounted on the first bracket 122 for triggering the sensor five 152 to indicate that the needle cap 19 is inserted into position. The needle cap 19 comprises an outer needle cap and an inner needle cap, the needle head is fixed on the inner needle cap, the outer needle cap is sleeved on the inner needle cap to play a role in protection, and when the needle cap 19 is inserted and sleeved on the liquid medicine barrel 121 in practical use, the outer needle cap can be pulled out, and the inner needle cap with the needle head is left at the front end of the liquid medicine barrel to finish injection.

Referring to fig. 5, 9, 10, 11 and 16, the rear portion of the liquid medicine barrel 121 is provided with a clamping table 1211, the clamping table 1211 is provided with an inward 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 cassette bottle 129. As shown in fig. 10, a boss 1212 is provided on the sidewall of the cartridge 121 protruding outward above the stop 1211, and is used for abutting against a limit protrusion 1623 of the bottle-changing switch assembly 16. The two sides of the front part of the liquid medicine barrel 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 installing and inserting the first protruding columns 1221 on the first supports 122. Two convex columns second 1214 are convexly arranged downwards on the lower side of the front part of the liquid medicine barrel 121 and used for installing the sensor seven 123. Referring to fig. 11, a through hole 1215 penetrating through the inner wall of the liquid medicine barrel 121 is formed on the side wall of the liquid medicine barrel between the two convex post pairs 1214 for placing a sensing switch 1231 on the sensor seven 123 to sense whether the cassette bottle 129 is in place. In front of the second convex column 1214, the front end of the liquid medicine barrel is the insertion end of the needle cap 19, the side wall of the liquid medicine barrel where the second convex column is located and the insertion end are transited through the inclined reduced barrel wall, the side wall of the insertion end of the liquid medicine barrel and the reduced barrel wall are provided with a second through hole 1217 for extending the front end of the touch control element 127, the needle cap 19 is sleeved on the insertion end and then touches the front end of the touch control element 127, and the touch control element 127 can generate the effect of tilting the rear end under the action of the needle cap 19, so that the corresponding fifth sensor 152 is triggered. The side wall of the insertion end of the liquid medicine barrel is further provided with a through hole III 1218 which is used for overlapping and attaching the support II 124, and for the convenience of buckling the support II 124, the upper side wall and the lower side wall of the insertion end are respectively convexly provided with a lug boss so as to be clamped with the corresponding through hole on the support II 124. Behind hole one 1213, outwards bulge on the lateral wall of liquid medicine section of thick bamboo 121 and set up projection three 1216 for the installation of spring one 128, spring one 128 is the torsional spring, and its one end is connected in liquid medicine section of thick bamboo 121, and the other end is connected in support three 126, does not receive the circumstances of external force, and spring one 128 struts liquid medicine section of thick bamboo 121 and support three 126 and is presented the angle ground, receives external force after, can push barrel cover 18 into the pen shell, makes spacing bellying 1623 among the switch module 16 of changing the bottle support and lean on in boss 1212 to prevent that liquid medicine section of thick bamboo 121 from popping out.

Referring to fig. 9 to 11, the first bracket 122 includes an arc-shaped connecting portion, a clamping portion, a supporting portion 1222 and a limiting portion 1223 in the middle, two ends of the arc-shaped connecting portion are respectively connected to the clamping portions, the two clamping portions are symmetrically disposed, and each clamping portion has a first protruding pillar 1221 protruding inwards. Referring to fig. 11, the support portion 1222 is through from front to back, and the support portion 1222 has a through groove at an upper portion thereof, and the support portion 1222 is used for installation and insertion of the touch control member 127, and supports the touch control member 127. The rear side of the arc-shaped connecting portion is connected with a limiting portion 1223, and the limiting portion 1223 is bent outwards and used for limiting installation of the touch piece 127. The first convex column 1221 on the clamping part of the first bracket 122 can be inserted into the fourth through hole 12621 of the third bracket 126 and the first hole 1213 on the liquid medicine cylinder, so that the liquid medicine cylinder 121 and the third bracket 126 form a pivoting relationship.

Referring to fig. 9 and 10, the sensor seven 123 is a position switch of the cassette bottle 129, and the sensor seven 123 has a mechanical sensing switch 1231, when the front bottle wall of the cassette bottle 129 touches the sensing switch 1231, the sensor seven 123 senses the signal and the cassette bottle 129 is regarded as being in place.

Referring to fig. 9, 10 and 11, the head of the second bracket 124 is in a shape of a ring sheet, and the upper and lower sides of the head are provided with rectangular ring frames to be clamped on the projection of the insertion part at the front end of the liquid medicine barrel 121. In addition, as shown in fig. 10 and 11, the second bracket 124 has backward extending sheet-like legs at the left and right sides of the head thereof to overlap the third through hole 1218, and the outer walls of the legs slightly protrude from the wall of the insertion part at the front end of the liquid medicine cartridge to increase the frictional force to the inner needle cap in the needle cap 19, so that the inner needle cap in the needle cap 19 inserted into the insertion part is clamped, 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 installed on the support plate 215 of the pen casing, 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 includes a bottom plate 1261, a first side plate 1262, a second side plate 1263, a front plate 1264 and a rear plate, the first side plate 1262 is connected to one side of the bottom plate 1261 and is substantially perpendicular to the bottom plate (the transition position may be an arc transition), the second side plate 1263 is connected to the other side of the bottom plate 1261 and is substantially perpendicular to the bottom plate (the transition position may be an arc transition), and the first side plate, the second side plate and the bottom plate form a groove structure to accommodate the liquid medicine cartridge 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 position may be an 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 position may be an arc transition). Five 12641 through holes 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 located on the outer side of the second side plate 1263, and a concave notch is formed in the middle of the second side plate 1263, so that the third convex column 1216 and the first spring 128 can be conveniently arranged. The front parts of the first side plate 1262 and the second side plate 1263 are both provided with a through hole IV 12621 for installing and inserting the first convex column 1221 on the first bracket 122. The first side plate 1262 is provided with a through hole for mounting the rack 143 in the second driving mechanism 14, and two convex blocks extending outwards are further arranged between the through hole and the bottom plate on the first side plate 1262 and can be used for mounting, limiting and supporting the rack 143. The rear end of the bottom plate 1261 extends rearward and is bent from the end thereof to a side close to the cartridge to form a support shield, and after the cartridge 129 is inserted, the support shield extends beyond the outer wall of the cartridge 129 but does not touch the inner wall of the cartridge, so that on the one hand, the cartridge can be partially protected and on the other hand, the cartridge can be abutted without affecting the operation of the screw sleeve 113.

Referring to fig. 7, 9 and 11, the touch control member 127 has a first touch portion 1271, an installation portion 1272 and a second touch portion 1273, the first touch portion 1271 is located at the rear end of the touch control member 127 and is used for triggering the fifth sensor 152, the second touch portion 1273 is located at the front end of the touch control member and is used for contacting the needle cap 19, and the installation portion 1272 is connected with the first touch portion and the second touch portion. The second touch part 1273 is bent inwards, the front end of the second touch part extends forwards, the overall dimension of the second touch part can be matched with the second through hole 1217, and when the second touch part is placed at the second through hole 1217, the outer edge of the second touch part can slightly protrude out of the edge of the outer wall of the liquid medicine barrel insertion part so as to effectively touch the needle cap. The mounting portion 1272 is inserted through the supporting portion 1222 and the limiting portion 1223 of the first bracket 122, and the first touch portion 1271 is bent outward to correspond to the position of the fifth sensor 152, so that the sensor can be triggered conveniently.

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 the liquid medicine barrel 121 of the injection pen for use, the rubber plug aluminum cover at the head part can be used for inserting the needle on the needle cap 19, and the rubber piston at the tail part can be used for being pushed by the threaded 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 withdrawing bracket 132 and a needle inserting bracket 133, the needle withdrawing bracket 132 and the needle inserting bracket 133 are both mounted on the barrel frame 131, and a second spring 134 is connected between the needle withdrawing bracket 132 and the needle inserting bracket 133.

The barrel 131 is penetrated in the front-back direction, and has a front part with a barrel-shaped part and a rear part with a plate-shaped part, the plate-shaped part is perpendicular to the axial direction of the barrel-shaped part, and the barrel-shaped part is provided with a stepped hole 1314 for placing the squeezing block 135. Two arc 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 used for clamping and matching the front end of the pen shell is formed between the convex edges. A through hole six 1311 for inserting the locking portion 1321 of the needle holder 132 is formed in the cylindrical portion at a position close to the plate-like portion, and a through hole seven into which the abutting portion one 1331 of the needle holder 133 is inserted is formed in a position opposite to the through hole six 1311. A boss four 1312 is arranged at the rear edge position of the plate-shaped part in a backward protruding manner in the direction of one side close to the through hole six 1311 and is used for installing a second installation part 1322 on the needle drawing support 132. At the other edge position of the rear side of the plate-shaped part, a convex column five 1313 is convexly arranged backwards in one side direction close to the through hole seven and is used for installing a mounting part three 1332 on the needle inserting bracket 133. At the other edge position of the rear side of the plate-shaped part, a position diagonal to the fifth convex column 1313 is provided with a sixth convex column 1315 protruding backwards for abutting against the second abutting part 1323 on the needle extracting bracket 132.

The needle extracting holder 132 is made of a metal sheet material, the needle extracting holder 132 has a clamping portion 1321, a mounting portion two 1322, a connecting portion and an abutting portion two 1323, the mounting portion two 1322 is formed by bending an end portion of the sheet material, the mounting portion two 1332 is of a substantially annular structure, the connecting portion connects the mounting portion two 1322 and the clamping portion 1321 and connects the clamping portion 1321 and the abutting portion two 1323, and the clamping portion 1321 is located at a substantially middle portion of the needle extracting holder. The connecting portion is outwardly arched or curved such that the locking portion 1321 tends to spring back when pressed. The locking part 1321 can lock the needle cap after being inserted into the six through holes 1311, so that the needle cap can be conveniently separated from the insertion part on the liquid medicine barrel. The locking portion 1321 is provided in parallel with the plate-like portion, that is, the locking portion 1321 is perpendicular to the axial direction of the cylindrical portion.

The needle inserting holder 133 has a mounting portion three 1332, an abutting portion one 1331, an abutting portion three 1333 and a connecting portion, the needle inserting holder 133 is made of a metal sheet material, and the mounting portion three 1332 is formed by bending an end portion of the sheet material and is approximately in a ring structure. The connecting part is connected with the mounting part III 1332 and the abutting part I1331 and is connected with the abutting part I1331 and the abutting part III 1333, and the abutting part I1331 is positioned at the approximate middle part of the needle inserting bracket. The connection portion is outwardly arched or curved so that the abutment portion has a tendency to spring back as soon as the 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 axis direction of the cylindrical portion, and the end face of the inner side of the first abutting portion is of an inclined shape with a lower front part and a higher rear part. After the needle cap 19 enters the barrel holder, the outer wall of the outer needle cap in the needle cap 19 abuts against the end face of the inner side of the abutting part I1331, and the abutting part I is pushed outwards, so that the abutting part III 1333 at the end part of the needle feeding bracket triggers the sensor six 153.

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

The two extrusion blocks 135 are positioned at 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 inwards-concave arc-shaped grooves for installing and limiting the rubber ring. The inner wall of the extrusion block 135 is in a transition of an inclined shape, so that the needle cap can be conveniently clamped in the barrel 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 dc 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 first side plate 1262 of the third bracket 126. The rear part of the rack 143 is provided with a sensor trigger 1431 protruding to trigger the second sensor 157 and the third sensor 158, so as to reflect the position of the rack 143, i.e. the position of the third bracket 126, i.e. the position of the liquid medicine cartridge, and 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) disposed on the circuit board 151, 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 and capacitors.

The circuit board 151 has a small rear portion and a bifurcated front portion, the front portion is divided into two branches with different lengths, the two branches are a longer first branch and a shorter second branch, a gap 1511 is formed between the first branch and the second branch, and the gap 1511 is used for accommodating the liquid medicine cartridge 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 skin is touched, a sixth sensor 153 and a fifth sensor 152 are sequentially disposed from front to back on the first branch, and the sixth sensor 153 is used for sensing the abutting condition of the third abutting portion 1333 of the needle inserting support 133, so as to sense the position condition of the outer needle cap in the needle cap. The fifth sensor 152 is used for sensing the position condition of the first touch part 1271 of the touch control member 127, and further sensing the position condition of the inner needle cap in the needle cap, namely reflecting whether the liquid medicine barrel 121 moves in place and reflecting whether the insertion part of the liquid medicine barrel is inserted in 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 for sensing a displacement of the screw insert 113 in the first driving mechanism 11, the first sensor 156 is located on a moving path of the touch portion 1131 of the screw insert 113, and when the screw insert 113 moves to the rear end of the touch portion 1131 to trigger the first sensor 156, the first sensor 113 moves to a preset position. On the second branch, a third sensor 158 and a second sensor 157 are arranged from front to back, and the second sensor 157 and the third sensor 158 are used for sensing the position of the sensor trigger 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 barrel 121. On the circuit board on the side of the first branch, a USB interface 155 is provided for charging or data transmission. On the circuit board or on the pen shell, a sound prompting element such as a buzzer and a circuit can be arranged. The sensor seven 123 is installed at the front side of the cartridge 121 to sense whether the cartridge 129 is in place.

The sensing control unit 15 can also include an internet of things unit module, and if a bluetooth module, a 5G module, an NB-IOT module, a WIFI module, a GRPS module and the like are adopted, the electronic injection pen can be incorporated into the internet of things.

The sensing control unit 15 may further include a temperature sensor to sense a temperature near the drug solution cartridge for determining whether the drug solution is affected.

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 connects the fixing post 164 and the connecting frame 162.

Bottle-changing button 161 is rectangular, and is installed in the side of pen shell, and is in same fore-and-aft position with window 211, and is in first shell and second shell juncture, all offers the breach that is used for installing bottle-changing button 161 on first shell 21 and second shell 17. Taking fig. 15 as an example, the connecting frame 162 is a sheet structure, one end of the inner side of the connecting frame is provided with a convex limiting protrusion 1623, and the outer end of the connecting frame extends outwards and bends upwards to form a fourth abutting portion 1621. The connecting frame 162 is provided with eight through holes 1622 at the position close to the limiting boss 1623, and the eight through holes are used for being sleeved on the fixing column 164. The third spring 163 is a torsion spring, one end of the torsion spring abuts against the limiting protrusion 1623, and the other end of the torsion spring can be connected to the fixing column 164 or abut against the first mounting portion 214 of the first housing 21. The fixing posts 164 are mounted on the first mounting portion 214 or integrally formed in the first mounting portion 214.

Referring to fig. 16 and 17, the cartridge 129 is replaceable when the cartridge 121 is opened. After the medicine is replaced, the screw sleeve 113 in the first driving mechanism 11 and the liquid medicine barrel 121 in the liquid medicine barrel assembly 12 are positioned on the same axis, so that the cartridge bottle 129 in the liquid medicine barrel 121 can be pushed linearly. The second driving mechanism is arranged at the side of the liquid medicine barrel assembly 12, and the rotation motion is converted into the linear motion of the rack through the matching of the worm and the rack in the second driving mechanism, so that the linear motion of the liquid medicine barrel assembly is promoted.

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

In fig. 18, an MCU (microcontroller unit) is a micro control unit, or a single chip microcomputer, and is connected to a memory (EEPROM), and the MCU performs unified coordination control on each component or module and a position switch (sensor). The battery unit 24 is a rechargeable lithium battery and a battery protection module. The first sensor, the second sensor, the third sensor, and the fifth sensor to the seventh sensor are substantially position switches for sensing position information of the corresponding component. And sensor four 154 is a tactile sensor that senses whether skin is touching. The display unit 22 may be an OLED screen and related circuits, and an OLED (organic light-Emitting Diode) 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 can control the buzzer to carry out sound 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) which can provide stable clock signals for the MCU to realize accurate control.

The USB interface is connected with the MCU through the USB-to-TTL module and can be connected with the 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 computers such as the PC and the like, 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 passes through four pins of RXD, TXD, VCC and GND of the singlechip, and corresponding level logic conforms to the TTL principle. The function of the USB-to-TTL module is to convert the level into the level which can be recognized by both parties for communication.

The upper computer can also be communicated with the MCU through a Bluetooth low energy module (BLE). The upper computer is not limited to a PC, a tablet computer, a mobile phone, etc.

The control procedure of the injection pen is shown in fig. 19, and specifically, mainly includes the following steps.

(1) Initializing;

the first motor 111 drives the screw rod 112 to rotate reversely, when the touch portion 1131 on the threaded sleeve 113 touches the first motor position switch, i.e., the first sensor 156, 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 bracket iii 126 move backward, when the sensor trigger part 1431 on the rack 143 touches a second motor position switch, i.e., the sensor ii 157, the second motor 141 stops rotating, and this position is considered as a maximum distance position where the bracket iii 126 driven by the second motor 141 can move backward;

(2) starting up;

and after the MCU is powered on, all the peripheral equipment is turned off, the power supply key is turned on for interruption, and the power-saving sleep mode is entered. And when the power supply key is pressed down, triggering interruption and exiting the sleep mode. Detecting a USB interface, if the USB is accessed, converting into a communication mode, and charging a battery; if the USB is not connected, the battery voltage is detected. If the battery voltage is low, restarting to enter a sleep mode; if the battery voltage is sufficient, the peripheral is initialized, the OLED, i.e., the display unit 22, is turned on, and the operating mode is entered.

(3) Data communication;

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

(4) A dressing change process;

when the bottle changing button 16 is pressed, the first spring 128 ejects the liquid medicine barrel 121 and the barrel cover 18 together, a medicine bottle for injection (namely, a cassette bottle 129) is manually placed in the liquid medicine barrel 121, the barrel cover 18 is pressed down, the liquid medicine barrel 121 and the barrel cover 18 are reset, and the medicine changing process is completed.

(5) A pin inserting process;

the needle cap 19 (including the outer needle cap and the inner needle cap) is manually inserted, the position switch of the outer needle cap, namely 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, the liquid medicine cartridge 121 is pushed forward until the liquid medicine cartridge is inserted into the inner needle cap, and the sensor trigger 1431 touches the sensor 158, which indicates that the liquid medicine cartridge is pushed into the inner needle cap. After the second motor 141 drives the worm 142 to rotate reversely so that the sensor trigger part 1431 touches the second sensor 157, the inner needle cap position switch, that is, the fifth sensor 152, is triggered to indicate that the inner needle cap with the needle head is taken out from the outer needle cap by the liquid medicine barrel and retracted into the pen, the OLED display unit displays that the needle insertion is completed, and the buzzer gives out a prompt sound.

(6) An exhaust flow;

the first motor 111 drives the screw rod 112 to rotate, the screw sleeve 113 is pushed forwards, after the front end of the screw sleeve 113 on the screw rod 112 contacts the piston in the cassette bottle 129, the cassette bottle 129 is pushed to 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 continuously rotating for a certain number of steps, the piston in the cassette bottle 129 is pressed for exhausting air in the needle, and the exhaust function is completed.

(7) One-key injection;

when the pen point is pressed on the injection position and the injection button in the film button is pressed, the MCU reads the state of the sensor IV 154, and judges that the pen contacts the skin, the second motor 141 starts to drive the worm 142 to rotate, so that the liquid medicine barrel 121 is pushed forward, and the needle on the liquid medicine barrel 121 is inserted into the skin, thereby completing the automatic needle insertion function. The first motor 111 drives the screw rod 112 to rotate, so as to push the screw sleeve 113 forward and inject the liquid medicine in the cassette bottle 129 into the body. Through the conversion of the injection dose that sets up into the rotation step number of first motor, after first motor 111 rotated and reached appointed step number, first motor 111 reversed direction appointed step number, loose the pressure to the piston in the medicine bottle. After the liquid medicine is fully diffused in the body, the second motor 141 drives the worm 112 to rotate reversely, the needle is pulled out from the skin and retracts into the injection pen, the OLED display unit 22 displays that the injection is finished, and the buzzer gives out a prompt sound.

(8) Needle pulling process;

the outer needle cap is manually inserted, the position switch of the outer needle cap, namely 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, the liquid medicine barrel 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 sends out a prompt sound. The needle pulling button 25 is manually pressed, the clamping part 1321 on the needle pulling support 132 is embedded into the joint of the inner needle cap and the liquid medicine barrel, the second motor 141 drives the worm 142 to rotate reversely, the liquid medicine barrel 121 retracts into the pen, the inner needle cap with the needle head is blocked by the clamping part 1321 and is not retracted after being left in the outer needle cap, the OLED display unit displays that the needle pulling is finished, and the buzzer sends out prompt tone.

(9) Setting a flow;

the display menu is switched by setting the film button, and the numerical value is adjusted by the upper key and the lower key. The menu content includes, but is not limited to, the following:

a) battery charge and state of charge;

b) the remaining dose;

c) setting an injection dose;

d) real-time temperature;

e) recording the injection;

f) setting date and time;

g) bluetooth connected state.

Example 2

In this embodiment, a linear motor or an electronic push rod may be used as the first driving mechanism 11 of the electronic injection pen, and a linear stepping motor may be used instead of the way of matching the exposed rotating lead screw with the threaded sleeve running linearly, that is, the way of linear movement of the exposed output shaft itself may be used, so long as the motor can switch at least two speeds.

If first actuating mechanism 11 includes first motor, screw rod and screw sleeve (nut), the output shaft of first motor connects screw sleeve, and screw sleeve has the internal thread, and screw rod threaded connection is on screw sleeve, and first motor is step motor, can set up guiding mechanism (like guide block or guide way) and lead the screw rod to make the screw rod can rectilinear movement under screw sleeve's effect. Other shapes, structures and principles can be consistent with the steps in the embodiment 1, and are not described in detail.

Example 3

In this embodiment, referring to fig. 20 and 21, the second driving mechanism 14 includes a second motor 141, a lead screw 144, and a first nut 145, and the second motor 141 is a dc motor. An output shaft of the second motor is connected with a lead screw 144, the lead screw 144 is screwed on a first nut 145, specifically, an external thread on the lead screw 144 is screwed on an internal thread on the first nut 145, and the first nut 145 is fixedly installed on a third support 126 on the liquid medicine cylinder assembly. The first nut 145 is fixed on the third bracket 126, and a protruding portion is arranged at one end of the third bracket 126, and a through hole is formed in the fixed position of the third bracket 126 for clamping and fixing the protruding portion. And a sensor trigger part for triggering the second sensor and the third sensor is convexly arranged on the third bracket 126.

The liquid medicine barrel assembly comprises a liquid medicine barrel, a guide rod, a third support 126, a touch part 127 and a first spring, 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 part 127 is hinged to the liquid medicine barrel, the third support 126 is movably installed on the guide rod, and the guide rod is installed on the pen shell.

The fixed column 164 of the bottle-changing switch assembly is mounted on/through the third bracket 126.

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

Referring to fig. 22 to 25, the needle changing mechanism includes a barrel and a needle pulling support 132, the needle pulling support 132 is made of a metal sheet material into an L shape, 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. 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 are connected to a second spring 134, and the second spring 134 is a compression spring in the embodiment and is used for resetting the needle pulling button 25 so as to drive the needle pulling support 132 to reset. A notch can be formed in the barrel frame of the needle changing mechanism 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 barrel wall at the rear part of the liquid medicine barrel is provided with a concave part 1210, the concave part 1210 can be a through hole or a groove, and in the concave part 1210, the barrel wall of the liquid medicine barrel is provided with a boss 1212 protruding into the space of the concave part so as to be used for abutting against a limit convex part in the bottle changing switch component. The other side wall of the front part of the liquid medicine barrel is provided with a hinging lug 1274, in the embodiment, the bracket I122 is not needed, and the liquid medicine barrel is hinged with the bracket III 126. Touch control member 127 has a hinge 1274 thereon to hinge ear 1274. And a limiting frame 1265 used for limiting the touch piece 127 is arranged on the third support.

Other shapes, structures and principles can be consistent with the steps in the embodiment 1, and are not described in detail.

Although the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the invention.

Claims

1. An electronic injection pen, comprising: 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 each mechanism, assembly and unit are arranged in an inner cavity of the pen shell, the needle changing mechanism (13) is arranged at the front end of the pen shell, the liquid medicine barrel assembly (12) is arranged at the rear side of the needle changing mechanism (13), the first driving mechanism (11) is arranged 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 for 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 clamping bottle (129) in the liquid medicine barrel assembly (12), the second driving mechanism (14) is connected with the medical fluid cylinder assembly (12) to drive the medical fluid cylinder assembly (12) to move back and forth.

2. Electronic injection pen according to claim 1, characterized in that the first drive mechanism (11) has at least,

a first drive speed for rapidly venting the bayonet bottle (129) prior to injection; and the number of the first and second groups,

a second drive speed for advancing the piston within the vial (129) for completing an injection; the first drive speed is greater than the second drive speed.

3. The electronic injection pen according to claim 1, wherein the first driving mechanism (11) comprises a first motor (111), a lead screw (112) and a threaded sleeve (113), an output shaft of the first motor (111) is connected with the lead screw (112), the threaded sleeve (113) has an internal thread and is threaded on the lead screw (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.

4. The electronic injection pen as claimed in claim 3, wherein the screw cap (113) is provided with a guide block (1133) or a guide groove, and the pen case is provided with a guide groove (216) or a guide block which is engaged with the guide block (1133) or the guide groove to allow the screw cap (113) to linearly move.

5. The electronic injection pen of claim 1, wherein the second driving mechanism (14) comprises a second motor (141), a worm (142) and a rack (143), an 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 cartridge assembly (12); or the second driving mechanism (14) comprises a second motor (141), a screw rod (144) and a first nut (145), an output shaft of the second motor is connected with the screw rod (144), the screw rod (144) is screwed on the first nut (145), and the first nut (145) is fixedly arranged on the liquid medicine barrel assembly.

6. The electronic injection pen according to any one of claims 1 to 5, wherein the liquid medicine cartridge assembly (12) comprises a liquid medicine cartridge (121), a first bracket (122), a guide rod (125), a third bracket (126), a touch control member (127) and a first spring (128), the front part of the liquid medicine 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 member (127) is mounted on the first bracket (122), and the first spring (128) is connected to the liquid medicine 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, 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 installed on the guide rod, and the guide rod is installed on the pen shell.

7. The electronic injection pen of claim 6, wherein the bottle changing switch assembly (16) comprises a bottle changing button (161), a connecting frame (162), a spring III (163) and a fixing column (164), the bottle changing button (161) abuts against the connecting frame (162), the connecting frame (162) is mounted on the fixing column (164) and can be used for locking and unlocking the liquid medicine cartridge (121), the fixing column (164) is mounted on the pen shell or integrally formed on the pen shell or mounted on the bracket III (126), and the spring III (163) is connected with the fixing column (164) and the connecting frame (162).

8. The electronic injection pen according to any one of claims 1 to 5, wherein the needle changing mechanism (13) comprises a barrel frame (131), a needle extracting bracket (132) and a needle inserting bracket (133), the needle extracting bracket (132) and the needle inserting bracket (133) are both mounted on the barrel frame (131), and a second spring (134) is connected between the needle extracting bracket (132) and the needle inserting bracket (133); or the needle changing mechanism comprises a barrel frame and a needle pulling support (132), the needle pulling support (132) is installed 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.

9. Electronic injection pen according to one of the claims 1 to 5, characterized in that the sensing control unit (15) comprises a circuit board (151), and a micro control unit arranged on the circuit board (151), a first sensor (156) for sensing position information of the first driving mechanism (11), a second sensor (157) for sensing extreme position information of backward movement of the liquid medicine barrel assembly (12), a third sensor (158) for sensing extreme position information of forward movement of the liquid medicine barrel assembly (12), a fourth sensor (154) for sensing whether to contact with the skin, a fifth sensor (152) for sensing relative position information of an inner needle cap and the liquid medicine barrel in the needle cap (19), and a sixth sensor (153) or an eighth sensor (136) for sensing position information of an outer needle cap in the needle cap (19), wherein each sensor is connected to the micro control unit.

10. The electronic injection pen according to any one of claims 1 to 5, further comprising a display unit (22), wherein the display unit is connected to the sensing control unit (15), a window (211) for the display unit (22) to display is opened on the pen shell, and a USB interface or/and a Bluetooth module is further disposed in the sensing control unit (15).