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EP-4736909-A1 - DRUG SOLUTION ADMINISTRATION DEVICE AND DRUG SOLUTION ADMINISTRATION SYSTEM

EP4736909A1EP 4736909 A1EP4736909 A1EP 4736909A1EP-4736909-A1

Abstract

A drug solution administration system (10) includes a drug solution administration device (100) that is detachably mounted to a holder (20). A casing (120) constituting the drug solution administration device has a bottom outer surface (126) that faces a holder inner surface (26) when the drug solution administration device is mounted to the holder. A flow path forming member (166) is accommodated in a recessed groove (132) of the bottom outer surface. The flow path forming member has an opening (172) and a hollow interior (170). The hollow interior forms a drug solution flow path (210) within the recessed groove. A drug solution discharged from a reservoir (102) in the casing flows along the drug solution flow path toward a cannula (66).

Inventors

  • UCHIYAMA, JOJI
  • SEKIGUCHI, Shota

Assignees

  • Terumo Kabushiki Kaisha

Dates

Publication Date
20260506
Application Date
20240723

Claims (12)

  1. A drug solution administration device comprising: a reservoir that is filled with a drug solution; and a casing that accommodates the reservoir, wherein the casing has a bottom portion including: a bottom outer surface which faces a living subject when the drug solution is administered to the living subject, and a bottom inner surface which is a back surface of the bottom outer surface, the reservoir is arranged on the bottom inner surface, the bottom outer surface has a recessed groove which is recessed in a direction orthogonal to an axial direction of the casing and directed toward the bottom inner surface, the bottom outer surface includes a groove inner side surface and a ceiling surface which are inner surfaces of the recessed groove, the drug solution administration device includes a flow path forming member which is accommodated in the recessed groove and has a hollow interior, and the hollow interior of the flow path forming member forms, within the recessed groove, a drug solution flow path through which the drug solution flows.
  2. The drug solution administration device according to claim 1, wherein an entirety of the flow path forming member is accommodated in the recessed groove in a thickness direction which is orthogonal to the axial direction of the casing and directed toward the bottom outer surface.
  3. The drug solution administration device according to claim 1, wherein the reservoir has a drug solution outlet from which the drug solution is discharged, the casing has a communication hole which communicates with the drug solution outlet, and the drug solution outlet and the drug solution flow path communicate with each other via the communication hole.
  4. The drug solution administration device according to claim 1, wherein, when the drug solution administration device is viewed in a thickness direction which is orthogonal to the axial direction of the casing and directed toward the bottom outer surface, at least a portion of the drug solution flow path overlaps with the reservoir.
  5. The drug solution administration device according to claim 4, wherein the reservoir has a curved side surface which is arcuate and curves in a convex shape toward the flow path forming member, and when a direction toward the bottom outer surface in the thickness direction is defined as a downward direction, and a direction opposite to the downward direction and away from the bottom outer surface is defined as an upward direction, a position of the flow path forming member in the thickness direction is between a lowermost portion of the reservoir and a central portion of the reservoir in the thickness direction.
  6. The drug solution administration device according to claim 1, wherein a material of the flow path forming member is resin.
  7. The drug solution administration device according to claim 6, wherein the flow path forming member is transparent.
  8. The drug solution administration device according to any one of claims 1 to 7, wherein the drug solution flow path extends in an axial direction of the reservoir, and the axial direction of the casing coincides with the axial direction of the reservoir.
  9. The drug solution administration device according to claim 8, wherein a flow direction of the drug solution in the drug solution flow path is opposite to a pushing direction on the drug solution stored inside the reservoir.
  10. The drug solution administration device according to claim 9, wherein the flow path forming member is substantially L-shaped.
  11. A drug solution administration system comprising: the drug solution administration device according to claim 1; and a holder that the drug solution administration device is detachably mounted to, wherein the holder has a cannula unit including a cannula to be indwelled in a body of a living subject, and the cannula unit is positioned in the holder between two end portions in the axial direction, and between two end portions in a width direction which is orthogonal to both the axial direction and a thickness direction, which is orthogonal to the axial direction of the casing and directed toward the bottom outer surface.
  12. The drug solution administration system according to claim 11, wherein the cannula unit has a first connecting portion, the flow path forming member has: a second connecting portion which is detachably connected to the first connecting portion, and an opening which is formed on a side portion facing the ceiling surface of the recessed groove and communicates with the hollow interior, and the recessed groove and the hollow interior form a drug solution flow path through which the drug solution discharged from the reservoir flows toward the cannula.

Description

Technical Field The present invention relates to a drug solution administration device and a drug solution administration system for administering a drug solution to a living subject. Background Art A portable drug solution administration system includes a cannula, a reservoir, and a pump unit. In the drug solution administration systems disclosed in US 11,291,764 and WO 2019/008562 A, the cannula, the reservoir, and the pump unit are accommodated in the same casing. A drug solution is stored in the reservoir. When using a drug solution administration system configured as described above, the user first fixes the casing to the body of a patient by adhering it thereto. Next, the user causes the distal end of the cannula to protrude from the holder and indwell in the body of the patient. Thereafter, the pump unit discharges the drug solution from the inside of the reservoir to the outside of the reservoir. The drug solution discharged from the reservoir is administered into the body of the patient through the cannula. In US 11,291,764, as illustrated in Fig. 1, the reservoir and the cannula are connected to each other via tubes (reference signs TU1 and TU2). In WO 2019/008562 A, as illustrated in Fig. 10G, the reservoir and the cannula are connected to each other via a joint (reference sign 548). As understood from Fig. 1 of US 11,291,764 and Fig. 10G of WO 2019/008562 A, the tubes and the joint are accommodated inside the casing. Summary of Invention In the configurations disclosed in US 11,291,764 and WO 2019/008562 A, as described above, it is necessary to accommodate the cannula, the reservoir, the pump unit, and the tubes (or the joint) in the casing. Therefore, it is not easy to downsize the drug solution administration device. An object of the present invention is to solve the above-described problem. (1) One aspect of the present invention is a drug solution administration device including: a reservoir that is filled with a drug solution; and a casing that accommodates the reservoir, wherein the casing has a bottom portion including: a bottom outer surface which faces a living subject when the drug solution is administered to the living subject, and a bottom inner surface which is a back surface of the bottom outer surface, the reservoir is arranged on the bottom inner surface, the bottom outer surface has a recessed groove which is recessed in a direction orthogonal to an axial direction of the casing and directed toward the bottom inner surface, the bottom outer surface includes a groove inner side surface and a ceiling surface which are inner surfaces of the recessed groove, the drug solution administration device includes a flow path forming member which is accommodated in the recessed groove and has a hollow interior, and the hollow interior of the flow path forming member forms, within the recessed groove, a drug solution flow path through which the drug solution flows. According to this configuration, it is possible to supply the drug solution from the reservoir inside the casing to the drug solution flow path formed outside the casing. In this case, it is unnecessary to bridge a tube or the like from the reservoir to the cannula inside the casing. Therefore, it is unnecessary to accommodate a tube inside the casing. As a result, the casing can be downsized, thereby enabling the downsizing of the drug solution administration device. Further, in assembling the drug solution administration device, it is easier to assemble the flow path forming member outside the casing than to additionally accommodate a tube inside the casing that has already accommodated the reservoir and the pump unit. (2) In the drug solution administration device according to item (1) above, an entirety of the flow path forming member may be accommodated in the recessed groove in a thickness direction which is orthogonal to the axial direction of the casing and directed toward the bottom outer surface. When the drug solution administration device is mounted to or detached from the holder, interference of the flow path forming member with the holder is avoided. Accordingly, the drug solution administration device can be smoothly mounted to or detached from the holder. (3) In the drug solution administration device according to item (1) or (2) above, the reservoir may have a drug solution outlet from which the drug solution is discharged, the casing may have a communication hole which communicates with the drug solution outlet, and the drug solution outlet and the drug solution flow path may communicate with each other via the communication hole. In this case, inside the casing, it is not necessary to establish communication between the drug solution outlet of the reservoir and the hollow interior of the flow path forming member via a tube or the like. Therefore, the number of components inside the casing is reduced, allowing for greater flexibility in the internal layout of the components in the casing. Furthermore, the downsi