CN107715254B - Drug cartridge and drug injector having the same - Google Patents

Drug cartridge and drug injector having the same Download PDF

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Publication number
CN107715254B
CN107715254B CN201610875744.7A CN201610875744A CN107715254B CN 107715254 B CN107715254 B CN 107715254B CN 201610875744 A CN201610875744 A CN 201610875744A CN 107715254 B CN107715254 B CN 107715254B
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China
Prior art keywords
drug
medicine
main body
pinion
mounting
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CN201610875744.7A
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Chinese (zh)
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CN107715254A (en
Inventor
金根植
林养浩
金喜赞
李晶灿
安重雨
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Oriental Medical
Seoul National University Industry Foundation
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Oriental Medical
Seoul National University Industry Foundation
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Publication of CN107715254A publication Critical patent/CN107715254A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31525—Dosing
    • A61M5/31526—Dosing by means of stepwise axial movements, e.g. ratchet mechanisms or detents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/31556—Accuracy improving means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31566—Means improving security or handling thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
    • A61M5/31578—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M2005/14268—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body with a reusable and a disposable component
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2006—Having specific accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/3152—Piston or piston-rod constructions, e.g. connection of piston with piston-rod including gearings to multiply or attenuate the piston displacing force

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

The present invention relates to a medicine injector capable of automatically and precisely injecting a medicine into a patient and a medicine cartridge mounted to the medicine injector to supply the medicine to be injected into the patient. The drug injector can include: a body; a mounting part provided at a lower part of the body and having a pinion protruding therefrom; a drive part which is arranged in the main body and rotates the pinion protruding from the mounting part; and a drug cassette which is provided in the mounting portion so as to be attachable/detachable, and which supplies a drug to be injected into a patient when the drug cassette is attached, the drug cassette including: a body having a shape with one side opened, a space for storing medicine to be injected into a patient is formed in the body, a first insertion hole into which a pinion is inserted is formed on the bottom surface, and a discharge port for discharging the medicine stored in the space is formed on the other side; and a piston member that discharges the medicine stored in the space to the discharge port, the piston member including a piston rod and a piston.

Description

Drug cartridge and drug injector having the same
Technical Field
THE present invention relates to a DRUG injector capable of automatically and precisely injecting a DRUG into a patient and a DRUG cartridge mounted to THE DRUG injector to supply THE DRUG to be injected into THE patient, and more particularly, to a DRUG cartridge which can be easily mounted to or dismounted from THE DRUG injector and which, when mounted, can be precisely controlled in a syringe pump manner, and a DRUG injector (DRUG CARTRIDGE AND DRUG injection DEVICE injecting THE SAME) having THE DRUG cartridge.
Background
A medical drug injector is a device for automatically injecting a certain amount of drug or infusion solution into a patient, and is a common medical instrument used in almost all medical fields including wards, emergency rooms, operating rooms, and the like including patients with chronic diseases who require continuous drug injection.
Such medical drug injectors are classified into general-purpose infusion pumps that use a method of injecting an infusion solution by applying pressure to an infusion bag, a method of pressing a drug storage chamber with an elastic body, a method of squeezing a tube (tube) by a peristaltic method to transfer an infusion solution, and a syringe pump (or syringe) pump that uses a piston method of pressing a mounted medical syringe by operation of a motor.
Generally, in the case of a medical drug injector that requires very precise drug injection control like an insulin injector, a syringe pump is mainly used.
In addition, such a drug injector is provided in a small and portable manner so that a patient can perform drug injection not only in a hospital but also in daily life outside the hospital.
On the other hand, in the conventional drug injector, since the drug storage unit is integrally formed with the main body having the drive unit and the control unit for automatically and precisely injecting the drug, there is a problem that the drug injector should be purchased and used again when the drug stored in the drug storage unit is completely used up.
In such a cartridge type medicine injector, since the main body having the drive portion and the control portion built therein can be used semi-permanently, and only the cartridge needs to be replaced when the medicine is used up, there is an advantage that the burden of the cost of the patient can be reduced.
However, although the cartridge type medicine injector is configured such that the cartridge can be easily attached to and detached from the main body, there is a problem in that it is difficult to configure the cartridge type medicine injector such that the medicine injection control can be automatically and accurately performed when the cartridge is attached to the main body.
As prior arts related to such a cartridge type medicine injector, there are korean patent No. 1347640 (hereinafter, referred to as 'prior art 1'), korean patent No. 1615745 (hereinafter, referred to as 'prior art 2'), and the like.
The prior art 1 relates to a "cartridge type drug injector" which has a problem that it is difficult to perform accurate drug injection control from the viewpoint that the drug stored in the cartridge is automatically injected into the patient by the piezoelectric pump set with the cartridge mounted to the body. This is because the injection of the drug can be precisely controlled by a syringe pump method in general.
Further, the prior art 2 relates to the "drug injection pump having a drug storage unit in a syringe form which can be stacked and bent" which has been granted by the present inventors, and has advantages such that not only the cartridge can be easily attached and detached, but also a plurality of cartridges can be attached, and the cartridge is small in size and portable, but also there is a problem that it is difficult to manufacture from the viewpoint of forming the syringe form in a bent form.
Prior art documents
Patent document
Patent document 1: korean granted patent No. 1347640 (public notice date: 2014 01, 03)
Patent document 2: korean patent No. 1615745 (published: 2016, 03, 02 and 2016)
Disclosure of Invention
Problems to be solved
The present invention is directed to solving the above-described problems, and provides a drug cassette that can be easily attached to or detached from a drug injector, and that can perform precise drug injection control in a syringe pump manner when attached, and a drug injector having the drug cassette.
Means for solving the problems
A drug injector according to an embodiment of the present invention automatically injects a drug into a patient, the drug injector can include: a body; a mounting part provided at a lower part of the body and having a pinion (pinion) protruding therefrom; a drive unit provided inside the main body and configured to rotate the pinion protruding from the mounting portion; and a drug cassette detachably provided to the mounting portion and configured to supply a drug to be injected into a patient when the drug cassette is mounted, the drug cassette including: a body having a shape with one side opened, a space for storing the medicine to be injected into the patient is formed in the body, a first insertion hole into which the pinion is inserted is formed on the bottom surface, and a discharge port for discharging the medicine stored in the space is formed on the other side; and a piston member that discharges the medicine stored in the space to the discharge port, the piston member including: a piston rod having a rack (rack) formed thereon and linearly moving by movement of the rack caused by rotation of the pinion, wherein the rack is engaged with the pinion inserted into the first insertion hole when the medicine cartridge is mounted to the mounting portion; and a piston formed at an end of the piston rod in a shape corresponding to a cross-sectional shape of the space, and configured to discharge the medicine stored in the space by being pushed in the direction of the discharge port by linear movement of the piston rod.
In the drug injector according to an embodiment of the present invention, a rack formation hole having an inner surface formed by the rack may be formed in the piston rod.
In addition, according to the medicine injector of an embodiment of the present invention, the medicine cartridge may further include a cover which is engaged with the opened side of the body to cover the opened side, the cover may be formed with a through hole through which the piston rod is inserted along a linear movement direction of the piston rod, and a second insertion hole which communicates with the first insertion hole in a state where the cover is engaged with the opened side of the body may be formed in a bottom surface of the through hole.
In addition, according to the medicine injector of an embodiment of the present invention, a discharge portion may be formed on the other side of the main body to extend from the discharge port and protrude outward of the main body when the medicine cassette is mounted to the mounting portion.
In addition, according to the medicine injector of an embodiment of the present invention, the mounting portion may be formed with a first mounting groove to which the body is mounted, and a second mounting groove extended from one side of the first mounting groove to mount the piston rod protruding from the body.
In addition, according to the drug injector of an embodiment of the present invention, the driving part may include: a motor provided on one side of the inside of the main body; a first gear part which is located at the lower part of the mounting part, has a protruding part protruding toward a hole formed in the mounting part at the center part thereof, and has a hook part engaged with the pinion gear at the end part thereof; and a gear assembly that transmits rotation of the motor to the first gear part.
On the other hand, a drug cassette for a drug injector according to an embodiment of the present invention is a drug cassette for a drug injector, which is detachably provided with a drug injector for automatically injecting a drug into a patient and which supplies a drug to be injected into the patient when the drug cassette is attached, and the drug cassette for a drug injector may include: a main body having a shape with one side opened, having a space for storing a medicine to be injected into the patient therein, having a first insertion hole formed in a bottom surface thereof, and having a discharge port formed in the other side thereof for discharging the medicine stored in the space; and a piston member that discharges the medicine stored in the space to the discharge port, the piston member including: a piston rod formed with a rack (rack) and linearly moved by movement of the rack; and a piston formed at an end of the piston rod in a shape corresponding to a cross-sectional shape of the space, and configured to discharge the medicine stored in the space by being pushed in the direction of the discharge port by linear movement of the piston rod.
Effects of the invention
The medicine cartridge and the medicine injector according to the embodiment of the present invention configured as described above are configured such that the pinion protruding from the body mounting portion is inserted into the first insertion hole of the medicine cartridge body, thereby allowing the medicine cartridge to be easily mounted on the body.
In addition, according to the drug cassette and the drug injector of the embodiment of the present invention, since the pinion and the rack are automatically engaged with each other when the drug cassette is mounted on the body mounting portion, the drug injection control can be accurately performed in the syringe pump manner.
The effects according to the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the claims and the description of the specification.
Drawings
Fig. 1 is a perspective view illustrating a medicine injector according to an embodiment of the present invention.
Fig. 2 is a diagram showing an example in which an LCD (liquid crystal display) screen according to fig. 1 is constituted by a touch panel.
Fig. 3 is a bottom perspective view of the drug injector according to fig. 1.
Fig. 4 is an exploded perspective view of the drug injector according to fig. 3.
Fig. 5 is an exploded perspective view of a drug cassette according to an embodiment of the present invention.
Fig. 6 is a front view of the drug cassette according to fig. 5.
Fig. 7 is a bottom perspective view of the drug cassette according to fig. 5.
Fig. 8 is a bottom view of the drug cassette according to fig. 5.
Fig. 9 is a diagram schematically illustrating a driving part according to an embodiment of the present invention.
Fig. 10 is a schematic cross-sectional view of a state in which the medicine cartridge according to fig. 5 is mounted to the medicine injector according to fig. 1.
Description of the symbols
10-drug injector, 20-body, 21-mounting, 70-pinion, 100-drug cartridge, 134-rack.
Detailed Description
Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
On the other hand, the thickness and the size in the drawings are exaggerated for clarity of the description, and thus, the present invention is not limited by the relative size or thickness illustrated in the drawings.
Fig. 1 is a perspective view showing a medicine injector according to an embodiment of the present invention, and fig. 2 is a view showing an example in which an LCD screen according to fig. 1 is formed of a touch screen.
Referring to fig. 1 and 2, a drug injector 10 according to an embodiment of the present invention includes a body 20 and a drug cassette 100, the drug cassette 100 being detachably provided to the body 20 and supplying a drug to be injected into a patient while being mounted to the body 20.
The drug cassette 100 stores a drug to be injected into a patient in the interior thereof, and when the drug cassette is mounted on the main body 20, the discharge portion 122 from which the drug stored in the interior is discharged protrudes to the outside of the main body 20.
In this way, an injection needle, a drug injection tube, or the like is connected to and engaged with the protruding discharge portion 122, so that the drug stored in the drug cassette 100 can be injected into the patient.
The medicine injector 10 according to the present embodiment is configured to automatically inject the medicine stored in the medicine cartridge 100 into the patient using a syringe pump method capable of performing precise medicine injection control, and for this purpose, the medicine injector 10 includes: a driving part which is provided inside the main body 20 and automatically injects the medicine stored in the medicine cartridge 100 by a syringe pump method; and a control unit for controlling the drive unit.
In addition, the medicine injector 10 according to the present embodiment is a cartridge type medicine injector which is used by newly attaching a new medicine cartridge 100 after detaching the medicine cartridge 100 from the body 20 in a case where the medicine stored in the medicine cartridge 100 has been completely exhausted, and thus the body having the driving part and the control part built therein can be used semi-permanently.
In addition, the medicine injector 10 according to the present embodiment can include: an LCD screen 12 provided on the upper surface of the main body 20; a switch (on/off)14 of the LCD screen 12, which is provided on the upper surface side of the main body 20; and a power switch 15 provided on a side surface of the main body 20.
As shown in fig. 2, the LCD screen 12 can be provided as a touch screen so that a user can manipulate precise drug injection conditions and the like by touch.
As described above, if the user directly sets the injection conditions of the automatically injected drug through the LCD 12 formed of the touch panel, the controller built in the main body 20 controls the driving unit according to the set conditions, and thus the drug stored in the drug cassette 100 can be automatically and accurately injected into the patient according to the set conditions.
In addition, various information such as the remaining battery level and the injection amount can be displayed on the LCD screen 12.
Fig. 3 is a bottom perspective view of the drug injector according to fig. 1, fig. 4 is an exploded perspective view of the drug injector according to fig. 3, fig. 5 is an exploded perspective view of a drug cassette according to an embodiment of the present invention, fig. 6 is a front view of the drug cassette according to fig. 5, fig. 7 is a bottom perspective view of the drug cassette according to fig. 5, and fig. 8 is a bottom view of the drug cassette according to fig. 5.
Referring to fig. 3 to 8, a medicine injector 10 according to an embodiment of the present invention can include: a mounting part 21 provided at a lower part (upper part when referring to fig. 3) of the main body 20 to mount the medicine cartridge 100; and a cover 40 covering the mounting portion 21.
In addition, a pinion (ping) 70 protrudes from the mounting portion 21, and a rack (rack)134 that meshes with the pinion 70 when the drug cassette 100 is mounted on the mounting portion 21 can be formed.
In detail, the drug cartridge 100 can include: a main body 110 having a flat shape with one side 112 opened, and having a space 111 for storing a medicine therein, and an outlet 115 for discharging the medicine stored in the space 111 formed on the other side; a piston member 130 that discharges the medicine stored in the space 111 to the discharge port 115; and a cap 140 which is engaged with the opened side 112 of the main body 110 to cover the opened side 112 in a state where the piston member 130 has been engaged with the main body 110.
In addition, a first insertion hole 117 may be formed in the bottom surface of the body 110, and the pinion 70 protruding from the mounting portion 21 is inserted into the first insertion hole 117 when the drug cassette 100 is mounted to the mounting portion 21.
The piston member 130 can include: a piston rod 132 formed with a rack 134, the rack 134 being engaged with the pinion 70 inserted into the first insertion hole 117 in a state where the drug cartridge 100 has been mounted to the mounting portion 21; and a piston 138 formed at an end of the piston rod 132 in a shape corresponding to the sectional shape of the space 111.
In this way, when the pinion 70 rotates in a state where the drug cassette 100 is mounted on the mounting portion 21, that is, in a state where the pinion 70 and the rack 134 are engaged with each other, the rack 134 linearly moves and the piston rod 132 linearly moves, and thus the piston 138 pushes the drug stored in the space 111 toward the discharge port 115 by the linear movement of the piston rod 132, and the drug can be discharged to the outside of the main body 110.
Further, a seal member 139 may be provided on the outer peripheral surface of the piston 138, and the seal member 139 may be fitted into the space 111 and press-contact the inner surface of the space 111 to press the medicine.
Further, a rack forming hole 135 can be formed in the piston rod 132, and the rack forming hole 135 has an inner side surface 137 formed by the rack 134.
For example, the rack forming hole 135 may be formed in a substantially rectangular shape so as to have at least one inner side surface 137 formed in a linear shape along the moving direction of the piston rod 132, and the rack 134 may be formed on at least one inner side surface 137 among the inner side surfaces 137.
Thus, when the drug cassette 100 is mounted to the mounting portion 21, the pinion 70 inserted through the first insertion hole 117 protrudes toward the rack formation hole 135 and engages with the rack 134.
At this time, the pinion 70 and the first insertion hole 117 are formed to have a diameter and a width corresponding to each other, and the rack 134 may be formed to protrude from the inner surface 137 of the rack formation hole 135.
Thus, as shown in fig. 8, the rack 134 can protrude toward the inside of the first insertion hole 117, and thus when the drug cassette 100 is mounted on the mounting portion 21, the pinion 70 protruding from the mounting portion 21 is inserted into the first insertion hole 117, and the pinion 70 and the rack 134 can be easily engaged with each other and mounted.
Further, a through hole 142 through which the piston rod 132 is inserted along the linear movement direction of the piston rod 132 may be formed in the cap 140, a stepped portion 143 that engages with the stepped portion 133 formed in the side surface of the piston rod 132 may be formed in the side surface of the through hole 142, and a second insertion hole 145 that communicates with the first insertion hole 117 when the cap 140 engages with the open side 112 of the body 110 may be formed in the bottom surface of the through hole 142. Here, the size of the second insertion hole 145 can be formed in a size corresponding to the size of the first insertion hole 117.
In this way, when the cap 140 is fitted to the open side 112 of the body 110 in a state where the piston 138 is fitted to the side 112 with the piston rod 132 penetrating the through hole 142 of the cap 140, the first insertion hole 117, the second insertion hole 145, and the rack formation hole 135 can be in a state of communicating with each other, and thus, when the drug cassette 100 is mounted to the mounting portion 21, the pinion 70 is inserted into the first insertion hole 117 and the second insertion hole 145 in this order, protrudes toward the rack formation hole 135, and is engaged with the rack 134.
On the other hand, the drug cassette 100 may include, on the other side of the main body 110: a discharge port 122 formed extending from the discharge port 115 and protruding outward of the main body 20 when the drug cassette 100 is mounted on the mounting portion 21; and an engaging portion 123 wrapping the discharge portion 122 with a predetermined distance from the discharge portion 122 and having a screw 124 formed on an inner side surface thereof.
In this way, in a state where the drug cassette 100 is attached to the main body 20, an injection needle, a drug injection tube, or the like is connected to the discharge portion 122 protruding to the outside of the main body 20, and the drug stored in the drug cassette 100 can be injected into the patient.
On the other hand, the mounting portion 21 can include: a first mounting groove 22 mounting the main body 110 of the medicine cartridge 100; a second mounting groove 23 formed extending from one side of the first mounting groove 22 to mount the piston rod 132 protruding from the main body 110; and a third mounting groove 24 formed at an edge side of the mounting part 21 to mount the fitting part 123 such that the discharge part 122 protrudes toward the outside of the body 20 in a state where the main body 110 has been mounted to the first mounting groove 22.
At this time, the pinion gear 70 is formed to protrude from the first mounting groove 22 and can protrude from a portion substantially adjacent to the second mounting groove 23.
The body 20 may include a cover 40 covering the mounting portion 21, a protruding groove 42 may be formed on one side of an edge of the cover 40, the protruding groove 42 may be engaged with the third mounting groove 24 to form a protruding hole in which the discharge portion 122 protrudes to the outside of the body 20 when the cover 40 is engaged with the mounting portion 21, a transparent window 43 formed of a transparent material may be formed on the cover 40, and the remaining amount of the medicine stored in the space 111 of the body 110 may be checked through the transparent window 43.
On the other hand, the driving unit provided inside the main body 20 is configured to be able to rotate the pinion gear 70.
Fig. 9 is a view schematically showing a driving part according to an embodiment of the present invention, and fig. 10 is a schematic cross-sectional view of a state in which a medicine cartridge according to fig. 5 is mounted to a medicine injector according to fig. 1.
Referring to fig. 9 and 10, the driving part 30 according to the present embodiment may include a motor 35 provided at one side inside the body 20, a power supply part 17 provided at one side of the motor 35, a first gear part 50 positioned at a lower portion of the mounting part 21, and a gear assembly 33 transmitting rotation of the motor 35 to the first gear part 50.
Further, a protruding portion 53 protruding toward a hole formed in the mounting portion 21 may be formed in the center portion of the first gear portion 50, a hook portion 52 to which the pinion gear 70 is engaged may be formed at an end portion of the protruding portion 53, an engaging portion 55 engaged with the main body 20 may be formed at a lower portion of the first gear portion 50, and the engaging portion 55 may rotate the first gear portion 50.
In this way, the pinion gear 70 engaged with the hook portion 52 of the first gear portion 50 can be rotated by the operation of the motor 35.
As seen from the above, the present invention relates to a drug cassette that can be easily attached to or detached from a drug injector and that, when attached, can perform precise drug injection control in a syringe pump manner, and a drug injector having the drug cassette. It should be noted that the embodiments can be modified in various ways. Therefore, the present invention is not limited to the embodiments disclosed in the present specification, and it should be noted that all the modifications that can be made by those skilled in the art are included in the scope of the claims of the present invention.

Claims (1)

1. A medication injector for automatically injecting medication into a patient, the medication injector comprising:
a body;
a mounting portion provided at a lower portion of the body and having a pinion protruding therefrom;
a drive unit provided inside the main body and configured to rotate the pinion protruding from the mounting portion; and the number of the first and second groups,
a drug cassette which is detachably provided to the mounting part and which supplies a drug to be injected to a patient when the drug cassette is mounted,
the above-mentioned medicine box body includes:
a main body having a shape with one side opened, a space for storing the medicine to be injected into the patient is formed in the main body, and an outlet for discharging the medicine stored in the space is formed on the other side; and the number of the first and second groups,
a piston member that discharges the medicine stored in the space to the discharge port, and,
a cover which is matched with the opened side of the main body to cover the opened side;
the piston member includes:
a piston rod having a rack forming hole formed therein to be linearly moved by movement of a rack caused by rotation of the pinion, wherein the rack forming hole has an inner side surface on which the rack is formed, and the rack is engaged with the pinion inserted into the first insertion hole when the medicine cartridge is mounted to the mounting portion; and the number of the first and second groups,
a piston which is formed at an end of the piston rod in a shape corresponding to a cross-sectional shape of the space and which discharges the medicine stored in the space by being pushed in a direction of the discharge port by linear movement of the piston rod,
the cap is formed with a through hole through which the piston rod is inserted along a linear movement direction of the piston rod,
the mounting part is formed with a first mounting groove for mounting the main body and the pinion gear protrudes, a second mounting groove formed extending from one side of the first mounting groove and mounting the piston rod protruding from the main body,
the drive unit includes:
a motor provided to the main body;
a first gear part located at a lower portion of the first mounting part, having a protrusion protruding toward a hole formed in the first mounting groove at a center portion thereof, and having a hook portion formed at an end portion thereof, to which the pinion gear is engaged; and the number of the first and second groups,
a gear assembly for transmitting the rotation of the motor to the first gear part,
a first insertion hole is formed in a bottom surface of the main body, and the pinion protruding in the first mounting groove is inserted through the first insertion hole when the medicine cartridge is mounted to the mounting portion,
a second insertion hole is formed in a bottom surface of the through hole of the cover, the second insertion hole communicating with the first insertion hole in a state where the cover is fitted to the opened side of the body so that the pinion gear inserted through the first insertion hole is inserted therethrough,
when the medicine cartridge is mounted to the mounting portion, the pinion protruding from the first mounting groove is inserted through the first insertion hole and the second insertion hole, and is engaged with the rack;
a discharge portion formed on the other side of the main body and extending from the discharge port so as to protrude outward of the main body when the medicine cartridge is mounted to the mounting portion;
and an engaging portion 123 wrapping the discharge portion 122 with a predetermined distance from the discharge portion 122 and having a screw 124 formed on an inner side surface thereof.
CN201610875744.7A 2016-08-12 2016-09-30 Drug cartridge and drug injector having the same Active CN107715254B (en)

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KR1020160103088A KR101923267B1 (en) 2016-08-12 2016-08-12 Drug cartridge and drug infusion device including the same

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KR101923267B1 (en) 2018-11-28
KR20180018116A (en) 2018-02-21

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