JP6569412B2 - Drug administration device - Google Patents

Description

  The present invention relates to a drug administration device, and more particularly to a drug administration device having a syringe and a plunger rod.

  Conventional drug administration devices include, for example, International Publication No. 2007/032352 (Patent Document 1), Japanese Unexamined Patent Application Publication No. 2015-128456 (Patent Document 2), Japanese Unexamined Patent Application Publication No. 2013-226198 (Patent Document 3), and Japanese Unexamined Patent Application Publication No. 2013. -226197 (patent document 4) and JP 2013-226193 (patent document 5).

International Publication No. 2007/032352 JP2015-128456A JP 2013-226198 A JP 2013-226197 A JP 2013-226193 A

  In a syringe pump, a medicine administration device (particularly a plunger rod) may not be correctly attached. In that case, there is a possibility that a phenomenon called “syphoning” in which the medicine in the syringe is administered regardless of the control.

  In order to prevent such a problem from occurring, it is necessary to restrict the plunger rod from moving forward. Patent Document 1 discloses means for fixing a plunger rod.

  Since the medicine administration tool used for the syringe pump may use a medicine aspirated by itself other than the prefilled syringe, it does not want to prevent movement in the pulling direction.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a drug administration device that prevents the plunger rod from moving unexpectedly while preventing the plunger rod from moving unexpectedly. It is the purpose.

  The drug administration device according to the present invention restricts the movement of the syringe, the plunger rod as the piston inserted into the syringe, and the plunger rod being inserted into the syringe, and allows the plunger rod to be discharged from the syringe. A regulating portion that regulates the movement of the plunger rod at a position along the longitudinal direction of the plunger rod. The holding part which hold | maintains at least one of a syringe and a plunger rod in the position where a control part controls the movement of a plunger rod is further provided. It is possible to invalidate the function of the holding unit by rotating the plunger rod with respect to the syringe.

  Preferably, the restricting portion can regulate the movement of the plunger rod at a plurality of positions along the longitudinal direction of the plunger rod.

  Preferably, the restricting portion includes a first portion provided on the syringe and a second portion provided on the plunger rod.

  Preferably, at least a part of the restricting portion is provided on a ridge extending in the longitudinal direction of the plunger rod.

1 is a perspective view of a drug administration device according to Embodiment 1. FIG. 1 is a perspective view of a drug administration device according to Embodiment 1. FIG. FIG. 3 is a plan view of the drug administration device viewed from a direction indicated by an arrow III in FIG. It is a side view of the medicine administration tool connected to the syringe pump. FIG. 5 is a side view of a medicine administration device in which a plunger rod is rotated by 45 ° from the position shown in FIG. 6 is a side view of a plunger rod used in a drug administration device according to Embodiment 2. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. Moreover, it is also possible to combine each embodiment.

(Embodiment 1)
1 and 2 are perspective views of a drug administration device according to the first embodiment. Referring to FIGS. 1 and 2, drug administration device 1 according to Embodiment 1 includes syringe 10 and plunger rod 20 inserted into syringe 10.

  The syringe 10 is a cylindrical member, and a nozzle portion 11 is provided at the tip thereof. A needle or a connector is connected to the nozzle portion 11. It is possible to connect the nozzle portion 11 to the infusion line through a connector. The liquid in the syringe 10 can be discharged from the nozzle portion 11.

  The distal end portion of the plunger rod 20 is inserted into the syringe 10. A seal member is provided at the tip of the plunger rod 20. The seal member is in close contact with the inner wall of the syringe 10. Thereby, the space of the part before the plunger rod 20 is sealed in the internal space of the syringe 10.

  Plunger ridges 21 and 29 are provided on the plunger rod 20. The ridges 21 and 29 extend in the longitudinal direction of the plunger rod 20. In this embodiment, four ridges 21 and 29 are provided, but the number of ridges 21 and 29 is not limited to four.

  In the protrusion 21, the engaging surface 22 extends in the longitudinal direction. A claw 24 is provided on the engagement surface 22. In this embodiment, the claw 24 is provided on only one protrusion 21, but the plurality of protrusions 21 may be provided with the claw 24. The claw 24 regulates the movement in the direction in which the plunger rod 20 is inserted into the syringe 10.

  FIG. 3 is a plan view of the drug administration device viewed from the direction indicated by arrow III in FIG. With reference to FIG. 3, a safety clip 30 is attached to the syringe 10. The safety clip 30 is provided on the flange-shaped portion of the syringe 10.

  The safety clip 30 is provided with an engaging portion 31 that can engage with the protrusion 21. A claw 34 is provided on the surface of the engaging portion 31. The movement in the direction in which the plunger rod 20 is inserted into the syringe 10 is restricted by the claw 34 of the engaging portion 31 and the claw 24 of the protrusion 21 meshing with each other.

  The engaging portion 31 and the engaging surface 22 constitute the restricting portion 2. The restricting unit 2 restricts the movement of the plunger rod 20 being pushed into the syringe 10 and allows the plunger rod 20 to be pulled out of the syringe 10.

  The safety clip 30 is provided with a holding portion 32 for suppressing the rotation of the plunger rod 20 in the direction indicated by the arrow 20a. The holding part 32 is engaged with the lower protrusion 21. The claw 34 of the engaging portion 31 and the claw 4 of the ridge 21 are reliably engaged with each other by the biasing force of the elastic material constituting the holding portion 32.

  Since the holding portion 32 allows the plunger rod 20 to move in the axial direction, the plunger rod 20 moves in the direction in which the plunger rod 20 is discharged from the syringe 10 even when the protrusion 21 is in contact with the holding portion 32. It is possible.

  The claws 24 and 34 act as a one-way clutch and allow only movement in one direction of the plunger rod 20. The claws 24 and 34 can be replaced with other configurations. For example, the plunger rod 20 can be attached to be movable only in a direction in which the plunger rod 20 is discharged from the syringe 10 by a ratchet mechanism.

  2 and 3, the plunger rod 20 is locked to the syringe 10, and the plunger rod 20 can be pushed into the syringe 10 side only after the lock is removed. It is not necessary to release the lock when pulling the plunger rod 20. When the plunger rod 20 is pulled, drag resistance by the claws 24 and 34 is generated.

  To release the lock, a force is applied in the direction in which the plunger rod 20 is rotated in the direction indicated by the arrow 20a. At this time, since the holding portion 32 is engaged with the ridge 21, rotating force is generated between the holding portion 32 and the ridge 21 in the direction indicated by the arrow 32a.

  When the force in the direction of the arrow 20a due to the rotation is greater than the force of regulation in the direction of the arrow 32a, the holding portion 32 and the protrusion 21 are disengaged. As a result, the plunger rod 20 can be rotated.

  When the plunger rod 20 rotates, the claw 24 of the plunger rod 20 and the claw 34 of the engaging portion 31 are disengaged. In this state, the plunger rod 20 can move in either the direction approaching the syringe 10 or the direction away from the syringe 10.

  FIG. 4 is a side view of the drug administration device connected to the syringe pump. Referring to FIG. 4, a syringe pump 100 is a device that injects a drug using a drug administration device (syringe). The syringe pump 100 includes a motor 110, a shaft 120 driven by the motor 110, and a hook 130 attached to the shaft 120. A hook 130 engages the rear end of the plunger rod 20.

  The hook 130 is connected to the shaft 120 and can move together with the shaft 120 in a direction approaching the syringe 10. A sensor may be provided on the hook 130 so that the dedicated plunger rod 20 provided with the restricting portion 2 can be detected. In this case, the syringe pump 100 may operate only when the dedicated plunger rod 20 is engaged with the hook 130.

  When injecting a medicine into the human body using the syringe pump 100, an infusion line connected to the human body is connected to the nozzle portion 11 of the syringe 10 filled with the medicine. In this state, the syringe pump 100 cannot push the plunger rod 20 into the plunger 10 because the claw 34 of the engaging portion 31 shown in FIGS.

  FIG. 5 is a side view of the drug administration device in which the plunger rod is rotated by 45 ° from the position shown in FIG. As shown in FIG. 5, the shaft 120 rotates the hook 130 by 45 degrees. Then, the plunger rod 20 rotates as shown in FIG. Thereby, the engagement between the claw 34 of the engaging portion 31 and the claw 24 of the protrusion 21 is released. As a result, the shaft 120 can push the plunger rod 20 into the syringe 10. The medicine in the syringe 10 is injected into the human body via an infusion line.

When a medicine is injected into a human body using a syringe pump, a siphoning phenomenon may occur. The siphoning phenomenon means that when the position of the syringe pump is higher than the patient and the pusher (plunger rod) of the syringe is not fixed for some reason, a medicine is injected in a large amount with a drop. For example, in a syringe with a large drop and a volume of 50 cm ³ , all the medicine may be spontaneously injected within 5 minutes if the syringe is not correctly fixed to the slider of the syringe pump. Furthermore, siphoning is more likely to occur when connected to other infusion routes with higher flow rates. However, the injection time varies depending on the conditions such as the head and the equipment used. Even when the head is small, siphoning may occur due to the extreme negative pressure.

  On the other hand, the occurrence of siphoning can be suppressed by engaging the claw 34 of the engaging portion 31 and the claw 24 of the protrusion 21. As an example, when the syringe 1 is used exclusively for the syringe pump 100, administration is started by pressing an administration start button or the like while the sensor on the syringe pump 100 side confirms that the syringe 1 is securely set. It is conceivable that the hook 130 is controlled to rotate by 45 ° by giving the instruction to the syringe pump. In this case, it is preferable that a manual part removing operation is not necessary.

  That is, the drug administration device 1 regulates the movement of the syringe 10, the plunger rod 20 inserted into the syringe 10, and the movement of the plunger rod 20 being inserted into the syringe 10, and the movement of the plunger rod 20 being discharged from the syringe 10. The restricting portion 2 is capable of restricting the movement of the plunger rod 20 at a position along the longitudinal direction of the plunger rod 20. The restricting portion 2 can regulate the movement of the plunger rod 20 at a plurality of consecutive positions along the longitudinal direction of the plunger rod 20. The restricting portion 2 includes an engaging portion 31 as a first portion provided in the syringe 10 and an engaging surface 22 as a second portion provided in the plunger rod 20. The holding part 32 which hold | maintains at least one of the syringe 10 and the plunger rod 20 in the position where the control part 2 controls the movement of the plunger rod 20 is further provided. The function of the holding part 32 can be invalidated by rotating the plunger rod 20 with respect to the syringe 10. At least a part of the restricting portion 2 is provided on the ridge 21 extending in the longitudinal direction of the plunger rod 20.

  In the drug administration device 1 configured as described above, the regulating unit 2 regulates the position of the plunger rod 20 at a plurality of positions, so that various volumes of medicine are held in the syringe 10 and the plunger rod 20 is moved. Can be regulated.

(Embodiment 2)
FIG. 6 is a side view of a plunger rod used in the drug administration device according to the second embodiment. With reference to FIG. 6, in the plunger rod 20 according to the second embodiment, the engagement surface 22 is continuously provided on the protrusion 21 in that the engagement surface 22 is provided intermittently on the protrusion 21. Different from the provided plunger rod 20 according to the first embodiment.

  The present invention can be used in the fields of drug administration devices and syringe pumps.

  DESCRIPTION OF SYMBOLS 1 Drug administration tool, 10 Syringe, 11 Nozzle part, 20 Plunger rod, 21, 29 protrusion, 22 engagement surface, 22a 1st engagement surface, 22b 2nd engagement surface, 24,34 nail | claw, 30 safety clip, 30a 1st part, 30b 2nd part, 31 engaging part, 31a 1st engaging part, 31b 2nd engaging part, 32 holding | maintenance part, 100 syringe pump, 110 motor, 120 shaft, 130 hook.

Claims (4)

A syringe,
A plunger rod inserted into the syringe;
A restriction part that restricts movement of the plunger rod inserted into the syringe and allows movement of the plunger rod discharged from the syringe;
The restricting portion can restrict the movement of the plunger rod at a position along the longitudinal direction of the plunger rod,
A holding part for holding at least one of the syringe and the plunger rod at a position where the restriction part restricts the movement of the plunger rod;
Ri can der disabling the function of the holding portion by rotating the plunger rod with respect to the syringe,
The said restriction | limiting part engages with the said plunger rod outside the said syringe, and is a chemical | medical agent administration tool which regulates the movement of the said plunger rod .   The drug administration device according to claim 1, wherein the restricting portion is capable of regulating movement of the plunger rod at a plurality of positions along a longitudinal direction of the plunger rod.   3. The drug administration device according to claim 1, wherein the restricting portion includes a first portion provided in the syringe and a second portion provided in the plunger rod.   The drug administration device according to any one of claims 1 to 3, wherein at least a part of the restricting portion is provided on a protrusion extending in a longitudinal direction of the plunger rod.