HK1237288B - Drug-solution administration device - Google Patents

Description

Drug administration device

Technical Field

The present invention relates to a drug administration device used for administering a drug into a living body.

Background Art

As devices for administering liquid medicines such as insulin, portable liquid medicine delivery devices are known that are attached to the skin of a user (patient) to administer the medicine and deliver the medicine over time. These liquid medicine delivery devices can automatically and continuously administer a predetermined amount of liquid medicine to the patient, or increase the amount of liquid medicine based on the patient's instructions during meals, exercise, and other situations. With these liquid medicine delivery devices, patients can be appropriately administered an appropriate amount of liquid medicine, thereby achieving sufficient efficacy and engaging in activities.

However, if the drug administration device is administered while air is present in the drug flow path, or if there is a delay between the activation of the infusion mechanism of the drug administration device and the actual start of infusion, air may be injected into the body, or the correct amount of drug administered to the body may be lost. Therefore, the patient needs to perform a filling operation before starting the administration operation. The filling operation is performed without the drug administration device installed by operating a controller and visually confirming that a slightly larger amount of drug is being delivered than the volume of the drug flow path of the drug administration device, or by continuing the infusion until the drug is discharged from the drug administration device.

If the drug delivery device is installed during the filling operation, not only is there a risk of air being injected into the body, making it impossible to determine the correct amount of drug delivered, but also, in the case of continuous infusion, an excessive amount of drug may be delivered. Furthermore, if the drug delivery device becomes accidentally detached from the body during the delivery operation, the intended drug may leak out of the body, potentially resulting in an insufficient amount of drug being delivered, making it impossible to determine the correct amount of drug delivered. Furthermore, if the drug delivery device is not installed during the delivery operation, expensive drug may leak out, making it difficult to determine the correct amount of drug delivered.

Accordingly, Patent Document 1 discloses a device in which an injection portion that is installed in a living body and injects a drug solution into the living body and an infusion portion that transports the drug solution to the injection portion are configured to be connected to each other, and the connection and separation status of the injection portion and the infusion portion are reported to the patient, thereby promoting the administration of an appropriate amount of drug solution.

Patent Document 1: Japanese Patent Application No. 2009-016635

However, in the above-mentioned device, if the patient fails to notice the notification or fails to fully understand the content of the notification, an appropriate amount of the medicinal solution may not be administered, and a sufficient medicinal effect may not be achieved.

Summary of the Invention

Therefore, an object of the present invention is to provide a drug administration device that can administer an appropriate amount of drug into a living body so that a user (patient) can obtain sufficient drug effects.

The drug administration device of the present invention comprises: an injection section, which is equipped with an injection component for injecting drug solution into a living body; an infusion section, which is equipped with an infusion component, which is configured to be connected to and separated from the injection section and to transport the drug solution to the injection component; and an infusion set, which transports the stored drug solution to the infusion set; a detection section, which detects the connection and separation of the injection section and the infusion section; and a control section, which controls the operation of the infusion set, and the control section limits the operation of the infusion set to fill the infusion set or the injection section with the drug solution and/or to administer the drug solution into the living body based on the detection result of the detection section.

According to the drug administration device of the present invention, the control unit limits the action of filling the infusion part or the injection part with drug solution and/or the action of administering drug solution into the biological body by the infusion device based on the detection result of the detection unit, thereby being able to administer an appropriate amount of drug solution into the biological body, so that the user (patient) of the drug administration device can obtain sufficient drug effect.

In addition, in the control unit, when the detection unit detects that the injection unit and the infusion unit are connected, if the filling action performed by the infusion pump is restricted, it is possible to prevent unwanted excessive drug solution from being administered into the living body, and it is possible to prevent air from being injected into the living body, thereby ensuring the correct amount of drug solution administered into the living body.

In this manner, with a very simple structure that restricts the filling operation by the infusion set, it is possible to reliably prevent the fluid from being transported to the infusion unit.

In addition, in the control unit, when the detection unit detects that the injection unit and the infusion unit are in a separated state, if the administration action performed by the infusion device is restricted, it is possible to prevent an undesirable amount of too little drug from being administered into the living body, and it is possible to prevent leakage of expensive drug, and to grasp the correct amount of drug administered into the living body.

In this manner, with a very simple structure that restricts the administration action by the infusion set, it is possible to reliably prevent the fluid from being transported to the injection member.

In addition, if the detection part arranges a first detected component having a contact surface and a first detection component for detecting the contact of the first detected component corresponding to the injection part and the infusion part, the connection and separation of the injection part and the infusion part can be reliably detected through a highly reliable and inexpensive structure.

In addition, if a detection unit is used that is provided with a second detected component that generates magnetism and a second detection component that detects the magnetism of the second detected component, then through a very simple structure, the connection and separation of the injection part and the infusion part can be reliably detected even if, for example, the second detected component and the second detection component are not necessarily in contact.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view showing a drug administration device according to an embodiment.

FIG. 2 is an exploded perspective view showing the components of the drug administration device of FIG. 1 excluding the controller.

3 is a perspective view partially showing an injection unit, an infusion unit, and a detection unit of the drug administration device of FIG. 1 .

4 is a cross-sectional view showing the structure of a flow path of a drug solution in a state where an injection portion and an infusion portion of the drug solution administration device of FIG. 1 are connected.

5 is a diagram showing a flow of a filling operation when the injection unit and the infusion unit of the drug administration apparatus of FIG. 1 are connected or separated.

FIG. 6 is a schematic diagram showing a filling operation of the drug administration device in the control shown in FIG. 5 .

7 is a diagram showing a flow of administration operation in a case where the injection unit and the infusion unit of the drug administration device of FIG. 1 are controlled and separated.

8 is a perspective view partially showing an injection unit, an infusion unit, and a detection unit of a drug administration device according to a modified example of the embodiment.

DETAILED DESCRIPTION

The following describes an embodiment of the present invention with reference to the accompanying drawings. The dimensional ratios in the accompanying drawings are exaggerated for ease of explanation and may differ from the actual ratios. In Figures 1 to 4 and Figure 8, arrows X, Y, and Z are used to indicate the orientation of the drug delivery device. The direction of the arrow indicated by X indicates the short side direction X of the drug delivery device. The direction of the arrow indicated by Y indicates the long side direction Y of the drug delivery device. The direction of the arrow indicated by Z indicates the thickness direction Z of the drug delivery device.

The drug administration device (insulin pump 100 ) will be described.

First, the structure of insulin pump 100 will be described with reference to FIG. 1 to FIG. 4 .

FIG1 is a perspective view of an insulin pump 100 according to an embodiment. FIG2 is a perspective view showing the various components of the insulin pump 100 of FIG1 in exploded form, excluding the controller 130. FIG2(A) shows the insulin pump 100 from above, with the disposable injection unit 110 located on the left side of the figure. FIG2(B) shows the insulin pump 100 from above, with the disposable injection unit 110 located on the right side of the figure. FIG2(C) shows the insulin pump 100 from below, with the disposable injection unit 110 located on the right side of the figure and facing the surface of a living body. FIG3 is a perspective view partially showing the disposable injection unit 110, the disposable infusion unit 120A, and the detection unit 140 of the insulin pump 100 of FIG1. FIG3(A) shows the disposable injection unit 110 and the detection unit 140 from above. FIG3(B) shows the disposable infusion unit 120A and the detection unit 140 from below. 4 is a cross-sectional view showing the structure of a flow path of a drug solution in a state where the disposable injection unit 110 and the disposable infusion unit 120A of the insulin pump 100 of FIG. 1 are connected.

The insulin pump 100 includes an injection unit (equivalent to the disposable injection unit 110 ), an infusion unit 120 (equivalent to the disposable infusion unit 120A and the reusable infusion unit 120B), a controller 130 , a detection unit 140 , and a control unit 150 .

The disposable injection unit 110 injects a drug solution (equivalent to insulin S) into the living body.

The disposable injection unit 110 includes an injection member (equivalent to the cannula 111), a holder 112, a puncture needle 113, and a housing 114. For hygienic reasons, the disposable injection unit 110 is disposed of after a few days of insulin S injection.

Cannula 111 injects a medicinal solution (equivalent to insulin S) into the body. As shown in FIG2(C), cannula 111 is connected to housing 114 and extends through inlet hole 112a of bracket 112. Cannula 111 is made of a resin material such as polyurethane, nylon, or ethylene-tetrafluoroethylene copolymer (ETFE) and is formed into a hollow cylindrical shape. As shown in FIG4, cannula 111 is inserted into the body by puncturing needle 113 while the cannula 111 is in a state where the cannula 111 is penetrated by the puncture needle 113. When the puncture needle 113 is removed from the cannula 111, the cannula 111 becomes a flow path for injecting insulin S into the body.

Bracket 112 holds cannula 111 in place within the body. Specifically, bracket 112 adheres to the surface of the body to secure cannula 111. Bracket 112 is made of a material that is flexible along the surface of the body and is rectangular in shape. One side of bracket 112 is coated with adhesive to ensure close contact with the surface. The other side of bracket 112 is connected to housing 114.

The puncture needle 113 is made of a metal such as stainless steel, aluminum, an aluminum alloy, titanium, or a titanium alloy. As shown in Figure 4 , its tip is formed with an acute-angled blade capable of puncturing a living organism. After puncturing the living organism while the puncture needle 113 is inserted through the lumen of the cannula 111 and then removed, the flow path 114f of the insulin S is sealed by a filling member 114d, which is provided in the housing 114 and through which the puncture needle 113 passes. The housing 114 integrally holds the cannula 111, the bracket 112, and the puncture needle 113, and is connected to the disposable infusion unit 120A.

As shown in FIG4 , the housing 114 is provided with the cannula 111 and the puncture needle 113 in the connected portion 114a, which is connected to the connecting portion 124a of the disposable infusion unit 120A (described later). The connected portion 114a is connected to the connecting portion 124a of the disposable infusion unit 120A, thereby penetrating the infusion tube 121 and forming a flow path 114f for the insulin S from the infusion tube 121 to the cannula 111. The connected portion 114a maintains a sealed state of the flow path 114f by removing the puncture needle 113 and sealing the opening of the connected portion 114a. Similarly, when the infusion tube 121 is penetrated by the connected portion 114a, the flow path 114f is maintained sealed by the filling member 114e that seals the opening of the connected portion 114a.

A guide portion 114c connected to the disposable housing 124 of the disposable infusion unit 120A is formed on the inner surface of the housing 114. The guide portion 114c is formed from a linear protrusion along the longitudinal direction Y. As shown in FIG2 , the abutted portion 114b provided on one side of the connected portion 114a of the housing 114 faces the abutting portion 124b provided on one side of the connecting portion 124a of the disposable housing 124.

The infusion unit 120 is composed of a disposable infusion unit 120A and a reusable infusion unit 120B, and delivers insulin S to the disposable injection unit 110 .

The disposable infusion unit 120A and the reusable infusion unit 120B are configured to be connectable to and detachable from the disposable injection unit 110 .

The disposable infusion unit 120A includes an infusion component (equivalent to the infusion tube 121), an infusion set 122, a battery 123, and a disposable housing 124. For hygienic reasons, the disposable infusion unit 120A is disposed of after a few days of insulin S infusion.

The infusion tube 121 delivers insulin S to the cannula 111 via the flow path 114f. The infusion tube 121 is made of, for example, a metal such as stainless steel, aluminum, an aluminum alloy, titanium, or a titanium alloy, or a resin material such as polyurethane, nylon, or ethylene-tetrafluoroethylene copolymer (ETFE), and is formed into a tubular shape having a flow path for the circulation of insulin S. One end of the infusion tube 121 is connected to the infusion set 122. As shown in Figure 4, when the disposable housing 124 of the disposable infusion unit 120A is connected to the housing 114 of the disposable injection unit 110, the other end of the infusion tube 121 extends through the flow path 114f that reaches the cannula 111. The flow path 114f of insulin S is kept sealed by a filling member 114e, which is provided in the disposable housing 124 and through which the infusion tube 121 extends.

The infusion set 122 delivers stored insulin S to the infusion tube 121. The infusion set 122 includes a syringe 122A storing insulin S, a pusher 122B that delivers the insulin S in the syringe 122A to the infusion tube 121, and a drive motor 122C that presses the pusher 122B.

The battery 123 supplies power to the drive motor 122C of the infusion set 122 .

The disposable housing 124 integrally holds the infusion tube 121, the infusion set 122, and the battery 123, and is connected to the disposable injection unit 110. The disposable housing 124 guides the infusion tube 121 along its inner surface toward a connection portion 124a connected to the housing 114 of the disposable injection unit 110. The disposable housing 124 has a guide portion 124c formed on its outer surface that is connected to the housing 114 of the disposable injection unit 110. The guide portion 124c is formed from a linear groove along the longitudinal direction Y.

The reusable infusion unit 120B includes a reusable housing 125. After completing several days of insulin S infusion, the reusable infusion unit 120B is reused for the next insulin S infusion. The reusable housing 125 is detachably connected to the disposable housing 124 to protect the various components of the disposable infusion unit 120A. The reusable housing 125 has a control circuit 151 mounted on its inner surface for the control unit 150 that controls the operation of the infusion device 122. The reusable housing 125 has contacts (not shown) that are electrically connected to the battery 123 when connected to the disposable housing 124, and power is supplied to the control unit 150 via these contacts.

In addition, the following mechanism can also be provided, namely, when the drive motor 122C is arranged in the reusable infusion part 120B and the disposable infusion part 120A is connected to the reusable infusion part 120B, the rotation of the drive motor 122C is converted into the squeezing of the pressing piece 122B of the disposable infusion part 120A by gears, etc.

The controller 130 is a device for the user (patient) to instruct operations such as filling the infusion unit 120 with insulin S and administering insulin, and includes input buttons 131 , a monitor 132 , a control circuit 133 , a battery 134 , and a housing 135 .

The input button 131 transmits instructions from the user (patient) to the control circuit 133 for turning on/off the power of the insulin pump 100 , filling operations of insulin S, administration operations, and the like.

The monitor 132 displays the contents of instructions given by the user (patient) via the input buttons 131 and the operating status of the insulin pump 100 .

The control circuit 133 is comprised of an integrated circuit. It includes a microcomputer and a wireless communication device. The microcomputer is equipped with a ROM that stores a control program that instructs the control circuit 151 on the operation of the insulin pump 100; a CPU that controls the system based on the control program; and RAM that temporarily stores the instructions. The wireless communication device is used to transmit and receive information to and from the controller 130 and the detection unit 140.

The battery 134 supplies driving power to the control circuit 133 and the monitor 132. The housing 135 has the input buttons 131 and the monitor 132 arranged on its surface, and the control circuit 133 and the battery 134 are housed therein.

The detection unit 140 detects the connection and separation between the disposable injection unit 110 and the disposable infusion unit 120A.

The detection unit 140 includes a first detected member (equivalent to the contact member 141 ) and a first detecting member (equivalent to the switch 142 ).

The abutment portion 114b provided on one side of the connected portion 114a of the housing 114 of the disposable injection unit 110 includes an abutment member 141. The abutment member 141 protrudes longitudinally and has an abutment surface at its distal end. A switch 142 detects abutment of the abutment member 141.

The switch 142 is provided on the connecting portion 124a of the disposable infusion unit 120A. The contact portion 124b provided on one side of the connecting portion 124a includes the switch 142, which is opposed to the contact member 141 along the longitudinal direction. The switch 142 receives power from the battery 123 and is connected to a circuit (not shown) comprising a resistor element having a predetermined resistance value.

The detection unit 140 detects the on/off state of the switch by detecting the voltage value applied to the resistor element. When the disposable injection unit 110 is connected to the reusable infusion unit 120B, the switch 142 of the pressing contact member 141 becomes open and the voltage value of the voltage applied to the resistor element is detected.

On the other hand, when the disposable injection unit 110 is separated from the reusable infusion unit 120B, the switch 142, which is separated from the contact member 141, is turned off, and no voltage is detected on the resistor element. The switch 142 can be provided on the reusable infusion unit 120B. The contact member 141 can be provided on either the disposable infusion unit 120A or the reusable infusion unit 120B, and the switch 142 can be provided on the disposable injection unit 110.

The detection unit 140 may be composed of a piezoelectric element that converts pressing force into an electrical signal, or a photocoupler that combines a light emitting element and a light receiving element.

The control unit 150 performs overall control of the insulin pump 100 .

In particular, the control unit 150 controls the filling operation and/or administration operation performed by the infusion set 122 .

The control unit 150 includes a control circuit 151. The control circuit 151 is composed of an integrated circuit and is mounted on the inner surface of the reusable infusion unit 120B. The control circuit 151 includes a microcomputer and a wireless communication device.

The microcomputer of control circuit 151 includes a ROM that stores a control program for controlling the delivery of the infusion device 122, a CPU that controls the infusion device 122 based on the control program, and a RAM that temporarily stores the driving amount of the infusion device 122. The wireless communication device is used to transmit and receive information with the controller 130 and the detection unit 140.

Next, the filling and administration operations of the insulin pump 100 will be described with reference to FIG. 5 to FIG. 7 .

FIG5 is a diagram illustrating the flow of a filling operation when the disposable injection unit 110 and the infusion unit 120 are connected or disconnected under the control of the insulin pump 100 of FIG1 . FIG6 is a schematic diagram illustrating the filling operation of the insulin pump 100 under the control shown in FIG5 . FIG7 is a diagram illustrating the flow of an administration operation when the disposable injection unit 110 and the infusion unit 120 are disconnected under the control of the insulin pump 100 of FIG1 .

First, the filling operation of the insulin pump 100 will be described.

When the detection unit 140 detects that the disposable injection unit 110 is connected to the disposable infusion unit 120A, the control circuit 133 of the controller 130 restricts the filling operation by the infusion set 122. That is, the infusion set 122 restricts delivery to the infusion tube 121 during the filling operation.

This control prevents the user (patient) of the insulin pump 100 from experiencing hypoglycemia due to excessive administration of insulin S. Furthermore, it prevents the injection of air into the body and ensures that the correct amount of insulin S is being administered. The control circuit 133 may be configured to provide a notification, such as sound or light, when the filling operation of the infusion set 122 is restricted.

Specifically, when the user (patient) operates the input button 131 via the controller 130 to perform the filling operation, the control shown in FIG. 5 is executed.

Operation of the input button 131 issues a filling operation request to the microcomputer of the control circuit 133. Upon receiving the filling operation request, the microcomputer of the control circuit 133 transmits a command to the wireless communication device to confirm the connection status between the disposable injection unit 110 and the disposable infusion unit 120A. Information is transmitted between the wireless communication device of the control circuit 133 and the microcomputer via SPI (Serial Peripheral Interface) communication.

The wireless communication device of the control circuit 133 of the controller 130 transmits a command to the wireless communication device of the control circuit 151 installed in the infusion unit 120 (reusable infusion unit 120B) to confirm the connection status between the disposable injection unit 110 and the disposable infusion unit 120A. Information is transmitted between the controller 130 and the control circuit 151 of the disposable infusion unit 120A via wireless communication.

Upon receiving the connection status confirmation command, the wireless communication device of the control circuit 151 confirms the connection status between the disposable injection unit 110 and the disposable infusion unit 120A with the microcomputer. Information is transmitted between the wireless communication device of the control circuit 151 and the microcomputer via SPI communication. The microcomputer of the control circuit 151 confirms the connection status between the disposable injection unit 110 and the disposable infusion unit 120A (whether the contact member 141 and the switch 142 are in contact) with the detection unit 140.

The detection unit 140 transmits the connection status of the disposable injection unit 110 and the disposable infusion unit 120A to the microcomputer of the control circuit 151. The connection status of the disposable injection unit 110 and the disposable infusion unit 120A is transmitted in the order from the microcomputer of the control circuit 151 to the wireless communication device, from the wireless communication device of the control circuit 151 to the wireless communication device of the control circuit 133, and from the wireless communication device of the control circuit 133 to the microcomputer.

The microcomputer of the control circuit 133 determines whether or not the filling operation by the infusion set 122 can be performed based on the connection state between the disposable injection unit 110 and the disposable infusion unit 120A.

When the disposable injection unit 110 and the disposable infusion unit 120A are connected, the filling operation is restricted by the microcomputer of the control circuit 133. In this case, the microcomputer of the control circuit 133 displays the fact that the disposable injection unit 110 and the disposable infusion unit 120A are connected (open) on the monitor 132. The microcomputer of the control circuit 133 can use the buzzer built into the controller 130 to announce that the disposable injection unit 110 and the disposable infusion unit 120A are connected (open).

On the other hand, when the disposable injection unit 110 is separated from the disposable infusion unit 120A, the microcomputer of the control circuit 133 permits the filling operation. In this case, the microcomputer of the control circuit 133 transmits a filling operation execution command in the following order: from the microcomputer of the control circuit 133 to the wireless communication device, from the wireless communication device of the control circuit 133 to the wireless communication device of the control circuit 151, and from the wireless communication device of the control circuit 151 to the microcomputer. Upon receiving the filling operation execution command, the microcomputer of the control circuit 151 executes the filling operation into the infusion set 122.

That is, based on the detection results of the detection unit 140, the control circuit 133 of the controller 130 instructs the infusion set 122 to perform a filling operation when the disposable injection unit 110 and the infusion unit 120 (disposable infusion unit 120A and reusable infusion unit 120B) are separated, as shown in Figure 6. In Figure 6, a portion of the insulin S filled into the infusion tube 121 drips outward from the front end of the infusion tube 121. The dripping insulin S is not administered into the body. In addition, in this embodiment, although the control circuit 133 of the controller 130 restricts the filling operation of the infusion unit 120 based on the detection results of the detection unit 140, this is not limited to this. The control circuit 151 itself may also restrict the filling operation of the infusion unit 120 based on the detection results of the detection unit 140. In the event that the control circuit 151 restricts the filling operation of the infusion unit, this information may be transmitted to the controller 130 and reported to the controller 130. In addition, since the extrusion speed that can be set by the administration action is very slow, if the filling action is performed at this speed, it takes a lot of time to confirm that the insulin S is dripping from the front end side of the infusion tube 121 to the outside. Therefore, the extrusion speed of the pressing member 122B in the filling action can be set to an extrusion speed faster than the extrusion speed that can be set by the administration action.

Next, the administration operation of the insulin pump 100 will be described.

When the detection unit 140 detects that the disposable injection unit 110 is separated from the disposable infusion unit 120A, the control circuit 151 limits the administration of insulin by the infusion set 122. Specifically, the infusion set 122 limits the delivery of insulin to the infusion tube 121 during the administration process based on the control of the control circuit 151. This control prevents the user (patient) of the insulin pump 100 from developing hyperglycemia due to insufficient administration of insulin S. Furthermore, it prevents leakage of expensive insulin S and ensures that the correct amount of insulin S is administered to the body. The control circuit 151 may be configured to provide a notification, such as sound or light, when the administration of insulin by the infusion set 122 is limited.

Specifically, when the disposable injection unit 110 and the disposable infusion unit 120A are separated during the administration operation by the infusion set 122 , the control shown in FIG. 7 is executed.

The microcomputer of the control circuit 151 determines whether the administration operation by the infusion set 122 can be continued based on the connection status of the disposable injection unit 110 and the disposable infusion unit 120A. This determination is continuously performed at regular intervals by the microcomputer of the control circuit 151 based on information from the detection unit 140.

When the disposable injection unit 110 and the disposable infusion unit 120A are separated, the microcomputer of the control circuit 151 stops the administration operation. Furthermore, information indicating the suspension of administration is transmitted sequentially from the microcomputer of the control circuit 151 to the wireless communication device, from the wireless communication device of the control circuit 151 to the wireless communication device of the control circuit 133, and from the wireless communication device of the control circuit 133 to the microcomputer. Upon receiving the suspension of administration, the microcomputer of the control circuit 133 displays on the monitor 132 that the disposable injection unit 110 and the disposable infusion unit 120A are separated (off).

The microcomputer of the control circuit 133 can notify the buzzer built into the controller 130 that the disposable injection unit 110 and the disposable infusion unit 120A are in the separated state (off).

As described above, according to the insulin pump 100 of the embodiment, the control unit 150 can introduce an appropriate amount of liquid medicine into the body by limiting the operation of filling the infusion tube 121 or the cannula 111 with insulin S and/or the operation of administering insulin S into the body by the infusion set 122 based on the detection results of the detection unit 140, thereby enabling the user (patient) to obtain a sufficient drug effect. Specifically, the user (patient) of the insulin pump 100 can maintain an appropriate blood sugar level.

In addition, in the control unit 150, when the detection unit 140 detects that the disposable injection unit 110 and the infusion unit 120 are in a connected state, it is possible to prevent unwanted excessive administration of insulin S into the living body by limiting the filling action performed by the infusion set 122, and it is possible to prevent air from being injected into the living body and to grasp the correct amount of liquid medicine to be administered into the living body.

In particular, in the control unit 150 , the delivery to the infusion tube 121 can be reliably prevented by a very simple configuration that restricts the filling operation by the infusion set 122 .

In addition, in the control unit 150, when the detection unit 140 detects that the disposable injection unit 110 and the infusion unit 120 are in a separated state, it is possible to prevent an undesirable amount of insulin S from being administered into the biological body by limiting the administration action performed by the infusion device 122, and it is also possible to prevent the leakage of expensive insulin S and to grasp the correct amount of liquid medicine administered into the biological body.

In particular, in the control unit 150 , the administration operation by the infusion set 122 is restricted by a very simple structure, thereby being able to reliably prevent the fluid from being delivered to the cannula 111 .

In addition, since the detection unit 140 arranges the abutment component 141 having an abutment surface and the switch 142 for detecting the abutment of the abutment component 141 corresponding to the disposable injection unit 110 and the infusion unit 120, the connection and separation of the disposable injection unit 110 and the infusion unit 120 can be reliably detected through a very reliable and inexpensive structure.

Modifications

A modified example of a drug administration device (insulin pump 200 ) will be described.

Insulin pump 200 differs from insulin pump 100 according to the above embodiment in that its detector 240 employs a magnetic detection method. In this modification, components identical to those in the above embodiment are denoted by the same reference numerals, and duplicate descriptions are omitted.

The structure of insulin pump 200 will be described with reference to FIG. 8 .

Fig. 8 is a perspective view partially showing the disposable injection unit 110, the disposable infusion unit 120A, and the detection unit 240 of the insulin pump 200. Fig. 8(A) shows the disposable injection unit 110 and the detection unit 240 from the top. Fig. 8(B) shows the disposable infusion unit 120A and the detection unit 240 from the bottom.

The detection unit 240 includes a second detected component (equivalent to the magnet 241) and a second detection component (equivalent to the magnetic sensor 242). The magnet 241 generates magnetism. The magnet 241 is disposed on the connected portion 114a of the housing 114 of the disposable injection unit 110. The magnetic sensor 242 detects the magnetism of the magnet 241. The magnetic sensor 242 is disposed on the connecting portion 124a of the disposable infusion unit 120A. The magnetic sensor 242 is opposed to the magnet 241 along the longitudinal direction. The magnetic sensor 242 connects the disposable injection unit 110 and the disposable infusion unit 120A, and detects a signal from the magnetic sensor 242 when the magnet 241 and the magnetic sensor 242 are in contact.

As described above, according to the insulin pump 200 of the modified example of the embodiment, since the detection unit 240 arranges the magnet 241 for generating magnetism and the magnetic sensor 242 for detecting the magnetism of the magnet 241 corresponding to the disposable injection unit 110 and the infusion unit 120, through a very simple structure, even if, for example, the magnet 241 and the magnetic sensor 242 are not necessarily in contact, the connection and separation of the disposable injection unit 110 and the infusion unit 120 can be reliably detected.

As mentioned above, the drug solution administration device of the present invention has been described by using the embodiment and the modified examples. However, these aspects can be modified as appropriate based on the contents described in the scope of the claims.

For example, the drug administration device is not limited to a device for injecting insulin S into a living body, but may also be a device for administering a drug having analgesic, anesthetic, or other medicinal effects into a living body.

This application is based on Japanese Patent Application No. 2014-229168 filed on November 11, 2014, the disclosure of which is incorporated herein by reference in its entirety.

Explanation of Reference Numerals: 100, 200…insulin pump (drug administration device); 110…disposable injection portion (injection portion); 111…cannula (injection component); 112…bracket; 112a…introduction hole; 113…puncture needle; 114…housing; 114a…connected portion; 114b…abutted portion; 114c…guide portion; 114d, 114e…filling component; 114f…flow path; 120…infusion portion; 120A…disposable infusion portion (infusion portion); 120B…reusable infusion portion (infusion portion); 121…infusion tube (infusion component); 122…infusion set; 122A…syringe; 122B…pressing member; 122C…driving motor; 123 …battery; 124…disposable housing; 124a…connecting portion; 124b…abutting portion; 124c…guiding portion; 125…reusable housing; 130…controller; 131…input button; 132…monitor; 133…control circuit; 134…battery; 135…housing; 140, 240…detecting portion; 141…abutting member (first detected member); 142…switch (first detecting member); 241…magnet (second detected member); 242…magnetic sensor (second detecting member); 150…control portion; 151…control circuit; S…insulin; X…short side direction of the insulin pump; Y…long side direction of the insulin pump; Z…thickness direction of the insulin pump.

Claims (7)

1. A drug delivery device, comprising: The injection unit has an injection component for injecting drug solutions into a living organism; An infusion unit includes: an infusion component configured to be connected to and detached from the injection unit and to deliver the drug solution to the injection unit; and an infusion set that delivers the stored drug solution to the infusion component. The detection unit detects the connection and separation of the injection unit and the infusion unit; and The control unit controls the operation of the infusion set; The controller receives requests from the user and controls the control unit. The drug delivery device is characterized in that... The drug delivery device performs the filling action of delivering the drug solution from the infusion set to the infusion component, and the delivery action of delivering the drug solution into the organism. When the controller receives a request from the user to perform the filling action, it requests the control unit to specify which state—connection or separation—of the injection unit and the infusion unit detected by the detection unit. Once it is confirmed that the injection unit and the infusion unit are in the separated state, a filling action execution command is sent to the control unit. When it is confirmed that the injection unit and the infusion unit are in the connected state, the filling action execution command is not sent to the control unit. 2. The drug delivery device according to claim 1, characterized in that, When the detection unit detects that the injection unit and the infusion unit are connected, the control unit restricts the filling action performed by the infusion set. 3. The drug delivery device according to claim 2, characterized in that, The action of the infusion set filling the infusion component is restricted. 4. The drug delivery device according to any one of claims 1 to 3, characterized in that, When the detection unit detects that the injection part is separated from the infusion part, the control unit restricts the delivery action performed by the infusion set. 5. The drug delivery device according to claim 4, characterized in that, The action that the infusion set gives to the injection component is restricted. 6. The drug delivery device according to claim 1, characterized in that, The detection unit is provided with a first component to be detected having a contact surface and a first detection unit for detecting the contact of the first component to be detected, corresponding to the injection unit and the infusion unit. 7. The drug delivery device according to claim 1, characterized in that, The detection unit is provided with a second detection component that generates magnetism and a second detection component that detects the magnetism of the second detection component, corresponding to the injection unit and the infusion unit.