JP4873061B2 - Medical dosing device - Google Patents

Description

  The present invention relates to a medical administration device that is driven by an electric drive source so as to administer a medicine, and particularly relates to an apparatus that facilitates replacement of a medicine cartridge.

  Insulin dependent patients need to have several injections of insulin during a week or day. The amount of insulin required varies from patient to patient, and the amount required for the patient varies during the course of the day and may vary from day to day.

  The patient performing the self-injection attaches the drug cartridge containing the drug to the infusion device, then attaches the needle assembly to the elastic seal side of the drug cartridge, then sets the dose, operates the infusion device, Inject drugs. The drug in the drug cartridge is not consumed after several such doses. The emptied drug cartridge is removed from the apparatus by the patient himself, a new drug cartridge is mounted, and the above-described injection operation is repeated. In such a conventional injection device, when exchanging the drug cartridge, a member for holding the drug cartridge (hereinafter referred to as a cartridge holder) is removed from the main body, the drug cartridge is taken out from the cartridge holder, and the new drug cartridge is used as the cartridge holder. It was common to insert and then attach the cartridge holder to the infusion device. (For example, see Patent Document 1)

  This conventional apparatus is a manual type syringe, and there is an electric type shown in FIG. FIG. 23 is a block diagram showing the inside of an electric syringe currently used for dentistry. The principle of drug administration will be described with reference to FIG. Now, the syringe 203 filled with the medicine is set in a cartridge holder 202 attached to the main body 210.

  When SW1 is pressed, the motor 211 rotates forward, and this rotational force is decelerated by the reduction gear box 209 directly connected to the motor 211 to rotate the reduction gear main shaft 208 of the reduction gear box 209. The tip of the reduction gear main shaft 208 meshes with the gear 206 via the rotating disk 207, and rotates the gear 206. Further, since the gear 206 meshes with the gear 205, the rotational force of the gear 206 is transmitted to the gear 205. On the same axis as the gear 205, a gear 205a is provided so as to mesh with a rack 204a provided in the lower right half from the center of the pushing piston 204. When the gear 205 rotates, the gear 205a also rotates in the same direction as the gear 205. As a result, the pushing piston 204 is moved in the direction of the injection needle 213, so that the medicine in the syringe 203 is removed from the injection needle 213. Extruded.

  At the time of injection, air is vented by the above-described operation, and then the injection needle 213 is inserted into the affected area to administer the drug. SW2 is a switch for reverse rotation of the motor 211, and 212 is a battery for driving the motor 211.

  Also, portability is important for insulin infusion devices, and therefore a small and lightweight device is desired. Here, the conventional injection device is generally a linear piston having a stroke capable of injecting all of the medicine in the medicine cartridge, and some of them are equipped with a curvature type piston. (For example, see Patent Document 2)

Utility Model Registration No. 3088706 Special Table 2000-513974 Publication

  By the way, when a patient actually uses an injection device, there is a demand for easy replacement of a medicine cartridge.

  However, in the conventional infusion device, in such a case, the cartridge holder in which the medicine cartridge is inserted is removed from the body of the infusion device, the medicine cartridge is taken out from the cartridge holder, replaced with a new medicine cartridge, and then the infusion device body again. It was inconvenient and troublesome to install a cartridge holder.

  In addition, in the case of an injection device having a linear piston shape, a piston having a stroke capable of injecting all of the medicine in the medicine cartridge is necessary, and the length of the piston is almost the same as the whole length of the medicine cartridge. Therefore, the length of the injection device itself is required to be at least twice as long as the length of the medicine cartridge, which contributes to an increase in the size of the device. In addition, in the case of an injection device having a curvature type piston, the length of the device can be made shorter than the former linear piston rod, but because of the curvature, the thickness of the device becomes thicker and the handling of the device is difficult. Arise.

  Furthermore, in the conventional medical administration device, the operation is simple by electrically injecting the drug, but when you feel uneasy whether the electric syringe including the drive unit such as a motor is operating normally. There is. The act of administering such a drug not only causes psychological distress, but also has a great influence on the human body when an abnormal operation of the electric syringe occurs, and may lead to a life-threatening state.

  The conventional medical administration device is configured as described above, and there is a problem that the operation of exchanging the cartridge is troublesome.

  In addition, there is a problem that the size of the apparatus is large and inconvenient to handle.

  In addition, in the electric drive type, there is a problem that the patient may have anxiety at the time of drug administration, such as air bleeding before injection and the operating state of the machine.

  The present invention has been made to solve the above-described problems, and provides a medical administration device that allows a patient to easily replace a cartridge and that can reduce the size of an injection device itself. The purpose is to do.

  In addition, the air venting operation is surely performed before the injecting operation, and the abnormal operation during the injecting operation is detected and notified to the user, thereby reducing physical and mental distress to the patient and a more stable state. It is an object of the present invention to provide a medical administration device capable of administering a drug.

  A first aspect of the present invention includes a drug cartridge in which one end is closed with a plunger, and a drug is stored therein, a cartridge holder that stores the drug cartridge, and a multi-stage expansion / contraction mechanism. And a piston rod assembly for pressing and moving the plunger.

  According to a second aspect of the present invention, in the above invention, the plurality of stages of expansion and contraction mechanisms of the piston rod assembly include a plurality of stages of piston rods that linearly slide in parallel to the axial direction of the cartridge holder, The length of each piston rod is set to be shorter than the total length of the medicine cartridge.

  A third invention is characterized in that, in the above invention, the plurality of piston rods are arranged concentrically and slide sequentially from piston rods located outside the concentric circles when extending.

  According to a fourth aspect of the present invention, there is provided a medicine cartridge whose one end is closed by a plunger and containing a medicine therein, a cartridge holder for containing the medicine cartridge, and a piston that presses and moves the plunger in the medicine cartridge. A rod assembly and a needle assembly for administering the medicine discharged from the other end of the medicine cartridge by the movement of the piston rod, and performing the air venting operation by the movement of the piston rod before administration. It is characterized by.

  The fifth invention is characterized in that, in the above invention, the puncture speed during the air venting operation is lower than the puncture speed during the administration.

  A sixth invention is characterized in that, in the invention, the piston rod operates at a speed lower than the speed at the time of administration during the air bleeding operation.

  In a seventh aspect of the invention, in the invention, the low speed operation of the piston rod during the air venting operation is based on PWM control (Pulse Width Modulation) for controlling by changing the ON / OFF ratio of the pulse width. It is characterized by.

  The eighth invention is characterized in that, in the invention, the low speed operation of the piston rod during the air venting operation is based on voltage control.

  The ninth invention is characterized in that, in the above invention, the administration operation is enabled after detecting that the air bleeding operation has been performed before the administration operation.

  According to a tenth aspect of the present invention, in the above invention, the button includes a button for performing the air venting operation and a button for injecting a medicine, and an operation by pressing a button for injecting the medicine after the air venting operation. It is characterized by permitting.

  In an eleventh aspect of the invention, in the above invention, the medical administration device further comprises means for detecting whether or not the vicinity of the needle assembly of the medical administration device is in contact with the administration site. The operation is suppressed.

  According to a twelfth aspect of the invention, one end of which is closed by a plunger, a medicine cartridge containing a medicine therein, a cartridge holder for containing the medicine cartridge, and a piston for pressing and moving the plunger in the medicine cartridge A rod assembly, a needle assembly for administering a drug discharged from the other end of the drug cartridge by the movement of the piston rod, and a dose setting means for a user to set a dose of the drug to be administered; The dose comparison means for comparing the set amount set by the dose setting means with the dose administered in the past, and if the comparison result by the dose comparison means is above a certain level, the operation of the piston rod is suppressed. And a control means for controlling to do so.

  A thirteenth invention is characterized in that, in the above invention, the dose comparison means compares the dose set by the user with the dose administered last time.

  A fourteenth invention is characterized in that, in the above invention, the dose comparison means compares a dose set by a user with a dose at a past multiple doses.

  A fifteenth invention is characterized in that, in the above invention, the dose comparison means compares the dose set by the user with an average value of doses at the time of multiple administrations in the past. It is.

  A sixteenth aspect of the present invention is characterized in that in the above-mentioned invention, there is provided notification means for notifying the user that the administration operation is not possible when the comparison result by the dose comparison means is a certain value or more. Is.

  According to a seventeenth aspect of the invention, in the invention, when the administration of the medicine set by the user is permitted after the notification by the notification unit, the control unit cancels the operation suppression of the piston rod. It is a feature.

  According to an eighteenth aspect of the invention, one end of which is closed with a plunger, a medicine cartridge containing a medicine therein, a cartridge holder for containing the medicine cartridge, and a piston for pressing and moving the plunger in the medicine cartridge A first dose detection means for programmatically detecting the dose of the drug, and a second dose detection means for detecting the actual dose of the drug by means of an electronic circuit, the first dose The detection result by the first dose detection means is detected by comparing the detection result by the dose detection means with the detection result by the second detection means.

  A nineteenth invention is characterized in that, in the above invention, when an excessive dose is detected by the first or second dose detection means, the piston rod is stopped and the administration operation is interrupted. It is what.

  The twentieth invention is characterized in that, in the above-mentioned invention, the dosage detected by the second dosage detection means is based on a movement amount of the piston rod.

  In a twenty-first aspect, the dose detected by the second dose detection means is based on a time when the piston rod moves at a constant speed in the invention. To do.

According to the medical administration device according to claim 1 of the present invention, one end of which is closed by the plunger, the medicine cartridge containing the medicine, the cartridge holder for housing the medicine cartridge, and the inside of the medicine cartridge The user sets the piston rod that moves the plunger by pressing the plunger, the needle assembly for administering the medicine discharged from the other end of the medicine cartridge by the movement of the piston rod, and the dosage of the medicine to be administered A dose setting means for comparing, a dose comparison means for comparing a set amount set by the dose setting means with a dose administered in the past, and a comparison result by the dose comparison means is not less than a certain value includes a control means for controlling so as to suppress the operation of the piston rod so that the dispensing operation impossible, the dosage comparing means If that comparison result is constant or more, comprising a notification means for notifying that the dispensing operation is possible on the user, and after notification by the notification means, the dosage of the drug that the user has set by pressing the administration switch If permitted, the control means cancels the piston rod operation suppression and performs the injection operation. If the dose changes greatly , notify the user before administration and confirm By adopting a configuration that shifts to operation, there is an effect that it is possible to reduce mental and physical pains to the electric medical administration device.

Further, according to the medical administration device according to claim 2 of the present invention, in the medical administration device according to claim 1 , the dose comparison means includes the dose set by the user and the administration administered last time. Since the dose is compared, the configuration is such that the user cannot move to the administration operation when the dose changes greatly, thereby reducing mental and physical pain to the motorized medical administration device. Can do.

According to the medical administration device according to claim 3 of the present invention, in the medical administration device according to claim 1 , the dose comparison means includes the dose set by the user and the past multiple doses. Compared to the dose at the time, if the dose greatly changes, the configuration in which the user cannot shift to the operation of the administration, the mental and physical pain to the electric medical administration device is reduced. Can be reduced.

According to the medical administration device according to claim 4 of the present invention, in the medical administration device according to claim 1 , the dose comparison means includes a dose set by the user and a plurality of doses in the past. Compared with the average value of the dose at the time, if the dose greatly changes, the user can not shift to the operation of the administration, so that the mental and physical for the electric medical administration device Pain can be reduced.

The arrow line figure which shows the whole medical administration device concerning Embodiment 1 of this invention. The block diagram of the needle holder vicinity for demonstrating replacement | exchange of the chemical | medical agent cartridge of the said medical administration instrument. The block diagram which shows the state which pulled out the needle holder from the main body for demonstrating replacement | exchange of the medicine cartridge of the said medical administration instrument. The block diagram which shows the state which took out the medicine cartridge for demonstrating replacement | exchange of the medicine cartridge of the said medical administration instrument. The principal part enlarged view of the needle holder in the said medical administration instrument. The principal part enlarged view for demonstrating the said medical administration instrument needle holder operation | movement. The figure which shows the state which slid the needle holder for demonstrating the said medical administration instrument needle holder operation | movement. The figure which shows the piston rod assembly of the said medical administration instrument. The figure for demonstrating the state of a detection lever at the time of attaching a needle assembly to the needle holder of the said medical administration instrument. The figure which shows the structure of the rear end part vicinity of the chemical | medical agent cartridge of the said medical administration instrument. The figure which shows the structure of the principal part of the piston rod assembly of the medical administration instrument concerning Embodiment 2 of this invention. The block diagram which shows the state which stored the piston rod assembly of the medical administration instrument concerning Embodiment 2 of this invention in the piston rod hold member. The block diagram for demonstrating operation | movement of the piston rod assembly of the medical administration instrument concerning the said Embodiment 2. FIG. The further block diagram for demonstrating operation | movement of the piston rod assembly of the medical administration instrument concerning the said Embodiment 2. FIG. The partial cross section figure for demonstrating the screwing state of the bush shaft and each piston rod of the medical administration instrument concerning Embodiment 1 of this invention. The perspective view for demonstrating the internal structure of the medical administration instrument concerning Embodiment 3 of this invention. The perspective view which shows the external appearance of the medical administration instrument concerning the said Embodiment 3. FIG. The block diagram for demonstrating the electrical circuit connection of the medical administration instrument concerning the said Embodiment 3. FIG. The figure which shows the flowchart for demonstrating operation | movement of the medical administration instrument concerning the said Embodiment 3. FIG. The figure which shows the flowchart for demonstrating operation | movement of the medical administration instrument concerning Embodiment 4 of this invention. The figure which shows the flowchart for demonstrating operation | movement of the medical administration instrument concerning Embodiment 5 of this invention. The figure which shows the flowchart for demonstrating operation | movement of the medical administration instrument concerning Embodiment 6 of this invention. The figure which shows the structure of the conventional medical administration instrument.

  Embodiments of a medical administration device of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is an overall configuration diagram of a medical administration device according to Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 1 denotes an administration device, which has an injection portion abutting cover 7 that abuts against an injection site when a patient performs self-injection at the distal end portion, and a needle assembly 6 is disposed therein. is set up.

  Here, when the patient replaces the medicine cartridge, the needle assembly 6 attached to the needle holder 4 is exposed when the injection portion contact cover 7 is slid in the direction of arrow A as shown in FIG. Originally, in order to prevent an accidental puncture accident caused by the needle assembly 6, it is normal to replace the needle assembly 6 after attaching a protective cover (not shown), but this is omitted here.

  Next, as shown in FIG. 3, the needle holder 4 is slid in the arrow B direction. By moving the needle holder 4 to a predetermined position and then rotating the needle holder 4 around the axis, the drug cartridge 2 is exposed from inside the administration device 1. Thereafter, the drug cartridge 2 is detached and attached by the patient himself.

  The above is a schematic description of replacement of the medicine cartridge 2. Next, a more detailed description will be given with reference to FIGS.

  In FIG. 5, support columns 9 are provided on both side ends of the front end portion of the cartridge holder 3 that holds the medicine cartridge 2 inside. The needle holder 4 to which the needle assembly 6 is attached is formed with a groove 8 for slide guide of the support 9, and the needle holder 4 and the cartridge holder 3 are fitted by the groove 8 and the support 9. ing.

  Here, when the patient replaces the medicine cartridge 2, as shown in FIG. 6, the needle holder 4 is moved in the direction of the arrow B in the direction of the arrow B after the injection portion contact cover 7 (see FIG. 2) is moved to a predetermined position. Slide in the direction of arrow B until the rear end abuts against the column 9. When the needle holder 4 is moved to a predetermined position, as shown in FIG. 7, the needle holder 4 rotates around the support column 9, and the distal end portion 2 a of the medicine cartridge 2 is exposed from the distal end of the cartridge holder 3.

  Thereafter, the medicine cartridge 2 can be replaced. In addition, after the new medicine cartridge 2 is mounted, the injection can be performed by reversing the above operation.

  Next, the holding form of the medicine cartridge 2 will be described with reference to FIGS.

  A detection lever 18 is attached to the needle holder 4. FIG. 9 shows a state of the detection lever 18 when the needle assembly 6 is attached to the needle holder 4 (see FIG. 8). When the needle assembly 6 is attached to the needle holder 4, the rear end portion of the needle assembly 6 presses the detection lever 18, and the rear end portion of the detection lever 18 presses the front end portion 2 a of the medicine cartridge 2. Yes. As shown in FIG. 10, the rear end portion 2 b of the medicine cartridge 2 is pressed by a pressing member 19 slidably attached to the outer periphery of the piston rod hold member 16.

  The pressing member 19 includes a spring member 20 and a stopper member 21.

  With the above configuration, the presence of the needle assembly 6 and the medicine cartridge 2 can be detected by detecting the position of the pressing member 19.

  As described above, in the first embodiment, the tip end portion of the drug cartridge 2 is exposed by pulling the needle holder 4 from the main body of the administration device 1 and rotating it, so that the cartridge holder 3 is attached to the administration device 1. Since the medicine cartridge 2 can be detached while being held, unlike the conventional case, the patient is not required to separate the cartridge holder from the apparatus main body every time the cartridge is replaced. The exchange can be performed freely regardless of the mounting state of the needle assembly, and handling can be facilitated.

(Embodiment 2)
Next, a medical administration device according to Embodiment 2 of the present invention will be described. FIG. 11 shows a configuration diagram centering on the piston rod assembly of the electric medical administration device according to the second embodiment of the present invention. As shown in the figure, the drive gear 10 for transmitting a drive source from a motor or the like (not shown) has a male screw shape (not shown) on the outer periphery, and has approximately the same length as the entire length of the rod assembly. The bush shaft 11 is press-fitted. Further, a hollow piston rod A12 having a female screw portion (not shown) screwed to the male screw portion of the bush shaft 11 on its inner peripheral portion has a male screw shape (not shown) on its outer peripheral portion. have. Further, a piston rod B14 having a female screw portion (not shown) screwed to the piston rod A12 on its inner peripheral portion is screwed to the piston rod A12. FIG. 15 shows the screwed state of the bush shaft 11, piston rod A12, and piston rod B14.

  Further, the piston rod A12 and the piston rod B14 are provided with convex anti-rotation parts 13 and 15 on the outer peripheral part, respectively. As shown in FIG. 9, the piston rod B14 is covered with a piston rod hold member 16 having a hollow shape that allows the piston rod A12 and the piston rod B14 to slide smoothly. The piston rod hold member 16 is provided with a concave piston rod rotation prevention portion 17 which is in contact with the rotation prevention portions 13 and 15 of the piston rod A12 and piston rod B14 and prevents the rotation thereof. It has been.

  Next, the actual operation will be described with reference to FIGS. First, FIG. 12 shows an initial state, and the rotation preventing portion 13 of the piston rod A12 is located outside the piston rod hold member 16. Here, the driving force of the driving gear 10 is transmitted to the bush shaft 11 and the piston rod A12, and the driving gear 10, the bush shaft 11 and the piston rod A12 rotate in one direction synchronously.

  Further, since the rotation preventing portion 15 of the piston rod B14 is in contact with the piston rod rotation preventing portion 17 of the piston rod hold member 16 and is in a non-rotatable state, it is transmitted from the piston rod A12 to the piston rod B14. The rotational force is converted into a propulsive force that moves the piston rod B14 forward, and the piston rod B14 slides in the direction of arrow A as shown in FIG. Here, the external thread part of the outer peripheral part of the precursor piston rod A12 is not formed in full length, but a part of several millimeters from the opposite side of the rotation preventing part 13 forms an incomplete thread part. Designed. Therefore, the rotation of the piston rod A12 stops when the threaded portion of the piston rod B14 reaches the incomplete threaded portion of the piston rod A12.

  Here, since the rotation preventing portion 15 of the piston rod B14 is still in contact with the piston rod rotation preventing portion 17 of the piston rod holding member 16, the piston rod A12 that has stopped rotating is synchronized with the piston rod B14. Then slide in the direction of arrow A. Further, at the same time that the rotation preventing portion 15 of the piston rod B14 is separated from the piston rod rotation preventing portion 17 of the piston hold member 16, the rotation preventing portion 13 of the piston rod A12 is moved to the piston rotation preventing portion 17 of the piston hold member 16. Therefore, the piston rod B14 slides in the medicine cartridge 2 in synchronization with the slide of the piston rod A12 (see FIG. 14). Further, returning the piston rod to the initial state may be performed by reversing the above described process.

  As described above, in the medical administration device according to the second embodiment, the expansion / contraction mechanism of the piston rod assembly is connected to the bushing shaft 11, the cylindrical piston rod A12 that is screwed to the bushing shaft 11, and the piston rod A12. The device can be made very compact by comprising a cylindrical piston rod B14 to be screwed together and a piston rod holding member 16 for housing them, and by moving the piston rod linearly in multiple stages. As a result, a medical administration device having excellent portability can be provided.

(Embodiment 3)
Next, a medical administration device according to Embodiment 3 of the present invention will be described with reference to FIGS.

  FIG. 16 is a perspective view for explaining the internal structure of the medical administration device according to the third embodiment, FIG. 17 is a perspective view showing the appearance of the medical administration device, and FIG. 18 is an electric diagram of the medical administration device. FIG. 19 is a block diagram for explaining the circuit connection, and FIG. 19 is a diagram showing a flowchart for explaining the operation of the medical administration device.

  First, FIG. 16 will be described.

  Now, the syringe 101 filled with the medicine is set in a cartridge holder 103 attached to the main body 102.

  Now, holding the main body 102 in hand, the contact sensor is applied to the site to be administered, and the administration switch 104 provided on the side surface of the main body 102 is pushed. Then, the needle motor 105 rotates forward, and this rotational force is transmitted to the slide cap 107 via the slide rod 106 directly connected to the needle motor 105. The rotational force of the needle motor 105 is converted by the slide cap 107 into a force for linear motion. The slide cap 107 moves in the direction of the arrow when the needle motor 105 rotates forward. By starting to move, the withdrawal sensor 108 is turned off. The slide cap 107 moves a certain amount in the direction of the arrow. At that time, the needle sensor 109 is turned on, and the rotation of the needle motor 105 is stopped.

  The slide cap 107 and the inner frame assembly part 110 are connected. When the puncture motor 105 rotates forward, the inner frame assembly unit 110 moves in the direction of the arrow. The inner frame assembly part 110 and the injection assembly part 111 are connected. Then, the injection assembly unit 111 is moved in the direction of the arrow when the puncture motor 105 rotates forward, and the injection needle 112 is put into the affected area.

  Then, after performing the needle operation, the injection motor 113 rotates forward, and this rotational force is decelerated by the reduction gear box 114 directly connected to the injection motor 113 to rotate the gear main shaft 115 of the reduction gear box 114. The tip of the gear main shaft 115 rotates the primary gear 116. Then, the rotational force is transmitted to the tertiary gear 118 via the secondary gear 117. The tertiary gear 118 and the primary rod 119 are connected. Since the primary rod 119 and the secondary rod 120 mesh with each other, the rotational force of the primary rod 119 is transmitted to the secondary rod 120. Since the secondary rod 120 and the tertiary rod 121 mesh with each other, the rotational force of the secondary rod 120 is transmitted to the tertiary rod 121. The rotational force of the tertiary rod 121 is regulated by a groove provided inside the cartridge holder 103, and the tertiary rod 121 moves in the direction of the arrow. When the tertiary rod 121 is propelled through the syringe 101 by a certain amount, the rotating secondary rod 120 also propels the syringe 101. The tertiary rod 121 pushes out the medicine in the syringe 101 from the injection needle 112 and performs an injection operation. The injection amount is adjusted by the rotation sensor 122 counting the rotation of the injection motor 113.

  In addition, about the structure of the primary rod 119, the secondary rod 120, and the tertiary rod 121, it shall have the same structure as the piston rod assembly demonstrated in Embodiment 1. FIG.

  When the injection operation is finished, the injection motor 113 rotates in the reverse direction to return the secondary rod 120 and the tertiary rod 121 to their original positions. Thereafter, the needle motor 105 rotates in the reverse direction, and the slide cap 107 moves in the direction opposite to the arrow. The slide cap 107 and the inner frame assembly part 110 are connected. Then, when the needle motor 105 rotates in the reverse direction, the inner frame assembly portion 110 moves in the direction opposite to the arrow. The inner frame assembly part 110 and the injection assembly part 111 are connected. Accordingly, the injection assembly part 111 is moved in the direction opposite to the arrow together with the inner frame assembly part 110 when the puncture motor 105 rotates in the reverse direction, and the needle 112 is removed from the affected part.

  When the slide cap 107 returns to the original position, the needle removal sensor 108 is turned on and the puncture motor 105 is stopped. Thereby, the needle removal operation is finished.

  Next, the external configuration of the medical administration device of the present invention will be described with reference to FIG.

  In FIG. 17, reference numeral 123 denotes a power switch, which is a switch for turning on the power when the medical administration device is used, and for turning off the power after use.

  Reference numeral 124 denotes an air vent switch for starting an air vent operation in the syringe or the injection needle.

  Reference numeral 125 denotes a setting switch for setting the amount of medicine to be injected into the body.

  Reference numeral 126 denotes a contact sensor for detecting whether or not it is in contact with a site to be administered.

  Reference numeral 127 denotes a display device for displaying the set amount of the medicine to be injected into the body and the status in the medical administration device, for example, the remaining amount of the medicine.

  Reference numeral 128 denotes a puncture port, which is an opening through which the injection needle passes at the time of puncture and withdrawal.

  Next, an electrical circuit configuration of the medical administration device having the configuration shown in FIGS. 16 and 17 will be described with reference to FIG. The same reference numerals as those in FIGS. 16 and 17 indicate the same or corresponding parts.

  Reference numeral 129 denotes a speaker, which is a device for notifying the user of the end of the operation by voice or notifying the user in case of abnormal operation.

  Reference numeral 132 denotes an origin sensor, which is a sensor for detecting that the piston for injecting the medicine in the syringe is in the position of the origin.

  A motor driver 131 outputs a signal for driving the injection motor 113 and the puncture motor 105 in accordance with a command from the microprocessor 130.

  Reference numeral 130 denotes a microprocessor, which is a control unit that issues a command to operate the injection motor 113 and the needle needle motor 105 in response to an input from the air vent switch 124, the administration switch 104, and the like according to a program.

  Next, the air venting and drug injection sequence of the medical administration device will be described with reference to the flowchart of FIG. When the air vent switch 124 or the administration switch 104 is pressed, the sequence starts (step a1).

  Next, it is determined whether or not the air vent switch 124 has been pressed (step a2). When the air vent switch 124 is pressed, the process proceeds to step a3.

  In step a3, the needle extraction sensor 108 is turned on using PWM (Pulse Width Modulation) control or the like that lowers the drive voltage of the puncture motor 105 or changes the ON / OFF ratio of the signal pulse width. The needle motor 105 is operated at a low speed during the period from when the needle sensor 109 is turned on to when the needle sensor 109 is turned on. Next, in step a4, the injection motor 113 is driven only by the necessary amount during the air venting operation to rotate normally, and the air venting operation is performed.

  Next, in step a5, the needle motor 105 is rotated in the reverse direction at a low speed to move the needle sensor 109 to the ON position, and the process is terminated (step a9).

  On the other hand, if the dosing switch 104 is pressed instead of the air vent switch 124 in step a2, the process proceeds to step a6. In step a6, since the pain to the patient can be reduced if the needle is operated at a high speed, the needle motor 105 is operated at a high speed.

  Next, in step a7, the injection motor 113 is operated to inject a set amount of medicine.

  Next, in step a8, after the injection is completed, the puncture motor 105 is rotated in the reverse direction at a high speed to move from the puncture position to the withdrawal position, and the process is completed (step a9).

  As described above, according to the medical administration device according to the third embodiment, by using the plurality of piston rods 119 to 121 and depressing the air vent switch 124, it is electrically operated as the piston rods 119 to 121 move. The air venting operation can be easily performed, and at the time of the air venting operation, the injection motor 113 is operated at a low speed, thereby reducing the risk that the drug attached to the injection needle or the like will scatter when visually confirmed. be able to.

(Embodiment 4)
Next, a medical administration device according to Embodiment 4 of the present invention will be described. Since the configuration is the same as that shown in FIGS. 16 to 18, redundant description is omitted here.

  The operation of the medical administration device according to the fourth embodiment will be described with reference to FIG.

  When the air release switch 124 or the administration switch 104 is pressed, the sequence starts (step b1).

  First, it is determined whether or not the air vent switch 124 has been pressed (step b2). If it is not the air vent switch 124 but the administration switch 104 that has been pressed, step b2 is performed again. At this time, in the case of the administration switch 104, the administration operation is not performed, so that the speaker 129 is used for voice, or the display device 127 is used for the display, or the speaker 129 and the display device 127 are both used. It may be configured to notify the person.

  On the other hand, if the air vent switch 124 is pressed in step b2, the process proceeds to step b3. In step b3, it is determined whether or not the contact sensor 126 is on. When the contact sensor 126 is on, there is a risk that the user may accidentally puncture the needle, so step b3 is performed again. At this time, when the contact sensor 126 is on, the air venting operation is not performed, so that the speaker 129 is used for voice, or the display device 127 is used for the display, or the speaker 129 and the display device 127 are displayed. Both may be configured to notify the user.

  On the other hand, if the contact sensor 126 is turned on in step b3, the process proceeds to step b4. In step b4, a process for operating the injection motor 113 to remove the syringe 101, the injection needle 112 and the internal air is performed.

  Next, the user presses the air bleed switch 124 again based on the judgment of whether the air bleed is sufficient for the injection needle 112 when it is insufficient.

  If air bleeding is sufficient, the administration switch 104 is subsequently pressed. In step b5, it is determined which switch has been pressed. If the air vent switch 124 has been pressed, the process proceeds to step b3, and if the administration switch 104 has been pressed, the process proceeds to step b6.

  In step b6, it is determined whether or not the contact sensor 126 is on. If the contact sensor 126 is not turned on, the administration device may not be in contact with the predetermined administration site of the user, so step b3 is performed again. At this time, since the injection operation is not performed when the contact sensor 126 is not turned on, the fact is displayed by using the speaker 129 by voice, the display device 127, or both the speaker 129 and the display device 127. It may be configured to notify the user. If the contact sensor 126 is on, the process proceeds to step b7.

  In step b7, the injection motor 113 is operated by an amount corresponding to the set amount to perform the injection operation, and the process is terminated (step b8).

  As described above, according to the fourth embodiment, the plurality of piston rods 119 to 121 are used to detect that the air vent switch 124 has been pressed before the administration switch 104 is pressed, Since the injection operation by pressing is enabled, the air venting operation can be surely performed before the injection operation, the risk of accidentally injecting air into the human body can be reduced, and the safety of the device Can be increased.

(Embodiment 5)
Next will be described a medical administration device according to a fifth implementation of the present invention. Since the configuration is the same as that shown in FIGS. 16 to 18, redundant description is omitted here.

  The operation of the medical administration device according to the fifth embodiment will be described with reference to FIG.

  The sequence starts (step c1) when the user enters a state for setting the injection amount.

  First, in step c2, a process for calculating a range from a past set value is performed. Use the previous dose as the range based on the previous set value, and use the method of setting the previous dose within the range of, for example, plus or minus 30%, or the average value of the past multiple times, for example, 10 times of data. Further, a method of setting the value within a range of, for example, plus or minus 30%, or a method of obtaining a range by statistically calculating data for a plurality of past times, for example, 10 times, using a standard deviation or the like may be used.

  Next, in step c3, the user determines the injection amount by the setting circuit 133.

  Subsequently, in step c4, the value input by the user in step c3 is compared with the value calculated in step c2. As a result of the comparison, if it is within the predetermined range, the process proceeds to step c6. If it is out of range, the process proceeds to step c5 described later.

  In step c5, the speaker 129 is used for voice to indicate that the user is out of the range, or the display device 127 is used for the display, or the user is notified by both the speaker 129 and the display device 127. Then, it is determined whether or not the process can proceed to the injection process. If the user permits the transition to injection, the process proceeds to step b7. If the user refuses, the process returns to step b3.

  In step b7, the injection motor 113 is operated for the set injection amount to perform the injection process, and the process ends (step b8).

  Note that in step c5, the speaker 129 is used as a voice to indicate that the user is out of range, or the display device 127 is used to display, or the speaker 129 and the display device 127 are both notified to the user. After that, it may be configured to move to step c3 without confirming the user.

  As described above, according to the medical administration device according to the fifth embodiment, when setting the dose with the setting switch 125, referring to the past dose, the set value and the past dose are set. When the comparison is performed and the comparison result is out of the predetermined range, the user uses the speaker 129 by voice to indicate that the set value is out of the range, or displays it using the display device 127, or the speaker 129. Since both the display device 127 and the display device 127 are notified to the user, depending on the drug, if the dose is accidentally administered in a different amount, the human body may be affected. In the case of change, it is possible to improve the safety of the electric medical administration device by notifying the user before administration and shifting to the confirmation operation, or by adopting a configuration incapable of shifting to the administration operation. Kill.

(Embodiment 6)
Next will be described a medical administration device according to a sixth implementation of the present invention. Since the configuration is the same as that shown in FIGS. 16 to 18, redundant description is omitted here.

  The electrical circuit configuration of the medical administration device according to the sixth embodiment will be described with reference to the block diagram of FIG. FIG. 22 is a diagram showing a state in which a setting circuit 133, a comparison circuit 134, and a count circuit 135, which are configurations unique to the present embodiment, are added to the configuration of FIG. 18, and the display device 127 shown in FIG. The speaker 129 and the like are omitted in the description.

  The rotation sensor 122 can output the operation of the injection motor 113 as a frequency, and is output to the microprocessor 130 and the count circuit 135.

  The count circuit 135 is an electronic circuit, and is a circuit that counts the signal of the rotation sensor 122 and can count the operation amount of the injection motor 113.

  The setting circuit 133 is also an electronic circuit, and is a circuit capable of holding the operation amount obtained by converting the injection amount output from the microprocessor 130. In addition, the microprocessor 130 can receive an instruction to start or end the injection operation by the microprocessor 130, whereby the count circuit 135 can be initially operated.

  The dose can be detected by counting the amount of movement of the piston rod or the time when the piston rod moves at a constant speed.

  The comparison circuit 134 is also an electronic circuit that compares the set value in the setting circuit 133 with the count value of the count circuit 135. If the count value exceeds a certain value with respect to the set value before the operation ends, the motor driver It is possible to stop the operation of 131 without passing through the microprocessor 130, and to notify the microprocessor 130 that it exceeds a certain level. Further, when the count value is less than or equal to the set value after the operation is completed, it is possible to notify the microprocessor 130 that the count value is less than or equal to a certain value.

  With such a configuration, in addition to monitoring the injection amount by program processing using the microprocessor 130, the comparison circuit 134 can directly monitor the actual injection amount in an electronic circuit. Even during the abnormal operation of the 130 program, it is possible to prevent excessive or insufficient injection of medicines by performing processing such as detecting the abnormality in the comparison circuit 134 and forcibly stopping the motor driver 131. Double safety measures can be provided, and the safety of the electric medical administration device can be improved.

  The medical administration device according to the present invention is useful as an electric injection device or the like for a medicine such as insulin which is easy to replace a medicine cartridge and has excellent portability.

DESCRIPTION OF SYMBOLS 1 Administration device 2 Drug cartridge 3 Cartridge holder 4 Needle holder 5 Piston rod 6 Needle assembly 7 Injection part contact cover 8 Groove part 9 Support | pillar 10 Drive gear 11 Bush shaft 12 Piston rod a
13 Piston rod a rotation prevention part 14 Piston rod b
15 piston rod b rotation prevention unit 16 piston rod hold member 17 piston rod rotation prevention unit 18 detection lever 19 pressing member 20 spring member 21 stopper member 101 syringe 102 body 103 cartridge holder 104 administration switch 105 puncture motor 106 slide rod 107 slide gap 108 Needle extraction sensor 109 Needle sensor 110 Inner frame assembly part 111 Injection assembly part 112 Injection needle 113 Injection motor 114 Reduction gear box 115 Gear main shaft 116 Primary gear 117 Secondary gear 118 Secondary gear 119 Primary rod 120 Secondary rod 121 Secondary rod 122 Rotation Sensor 123 Power switch 124 Air vent switch 125 Setting switch 126 Contact sensor 127 Display device 128 Needle port 129 Speaker 130 Microprocessor 131 Motor driver 132 Origin sensor 133 Setting circuit 134 Comparison circuit 135 Count circuit

Claims (4)

One end of which is closed with a plunger, and a drug cartridge containing the drug inside,
A cartridge holder for storing the medicine cartridge;
A piston rod that moves by pressing a plunger in the medicine cartridge;
A needle assembly for dispensing the drug discharged from the other end of the drug cartridge by movement of the piston rod;
A dose setting means for the user to set the dose of the drug to be administered;
A dose comparison means for comparing a set amount set by the dose setting means with a dose administered in the past;
If the comparison result by the dose comparison means is greater than or equal to a certain value, the control means for controlling to suppress the operation of the piston rod so that the administration operation is impossible ,
A notification means for notifying the user that the administration operation is impossible when the comparison result by the dose comparison means is a certain value or more ,
After the notification by the notification means, when the user permits the administration of the medicine set by pressing the administration switch, the control means cancels the operation suppression of the piston rod and executes the injection operation.
A medical administration device characterized by that. The medical administration device according to claim 1,
The dose comparison means compares the dose set by the user with the previous dose.
A medical administration device characterized by that. The medical administration device according to claim 1,
The dose comparison means compares the dose set by the user with the dose at the past multiple doses,
A medical administration device characterized by that. The medical administration device according to claim 1,
The dose comparison means compares the dose set by the user with the average value of doses at the time of multiple administrations in the past.
A medical administration device characterized by that.

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