JP2019103565A - Syringe - Google Patents

Abstract

To provide a syringe which can be surely connected to a medical device corresponding to a stored agent, and prevents an exchange connector from being removed and reused.SOLUTION: A syringe 1 is connected to a medical device 30 and supplies a dedicated agent 10. The medical device is used only for administration of the dedicated agent 10. The medical device includes a receiving part having a specific shape corresponding to the dedicated agent 10. The syringe 1 includes a barrel 4 and a connector 2. The cylindrical barrel 4 can store the dedicated agent 10. The barrel 4 includes a nozzle 3. The dedicated agent 10 is discharged from the nozzle 3. The connector 2 is connected to the nozzle 3 so as not to be detached. The connector 2 has a shape which is connectable to the receiving part having a specific shape corresponding to the dedicated agent 10, and is not connectable to the medical device used for administration of another agent excluding the dedicated agent 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a syringe.

  A technique related to a luer connector connected to a syringe or the like is disclosed, for example, in Japanese Patent Application Publication No. 2016-540618 (Patent Document 1).

Japanese Patent Application Publication No. 2016-540618

  Medical devices are used to administer drugs to patients. Syringes are used to deliver medication to medical devices. The connection with the syringe in the medical device has a specific shape corresponding to each of the various medicines. It is required to securely connect a syringe containing a drug to a medical device corresponding to the drug.

  The connector disclosed in the above-mentioned Patent Document 1 converts the specific shape corresponding to one medicine of the connector of the syringe into the specific shape corresponding to another medicine. Therefore, the syringe may be connected to a medical device that does not correspond to the medicine contained in the syringe.

  An object of the present invention is to provide a syringe that can be reliably connected to a medical device corresponding to a contained medicine, and prevents the conversion connector from being disconnected and used.

  The syringe according to the present invention is connected to a medical device and supplies a dedicated medicine to the medical device. Medical devices are used exclusively for the administration of specialized drugs. The medical device includes a receiver having a specific shape corresponding to the special agent. The syringe comprises a cylindrical barrel, a plunger, a gasket and a connector. The barrel can contain a dedicated drug. The barrel contains a nozzle from which the special agent is discharged. The plunger is axially moveable in the barrel within the barrel. The gasket has an outer diameter approximately equal to the inner diameter of the barrel. A gasket is provided at the tip of the plunger. The connector is non-removably joined to the nozzle. The connector is connectable to a receptacle having a specific shape corresponding to a dedicated drug, and has a shape that can not be connected to a medical device used for administration of another drug that is not a dedicated drug.

  According to the above-described syringe, it is possible to reliably connect the syringe containing the special agent to the medical device used for administration of the special agent.

  In the above-described syringe, the connector has a joint and a fragile part. The joint portion is a portion where the connector and the nozzle are joined. The fragile portion is smaller in strength than the joint portion. By providing the weakened portion, it is surely impossible to remove the connector from the nozzle.

  In the above-described syringe, the fragile portion is broken when a torque equal to or greater than a specified value acts on the connector. This makes it more reliably impossible to remove the connector from the nozzle.

  According to the application of the present invention, the syringe can be reliably connected to the medical device corresponding to the contained medicine, and repeated use can be prevented.

1 is a perspective view of a syringe according to Embodiment 1. FIG. It is a fragmentary sectional view of a syringe which follows the II-II line shown in FIG. 1 is a cross-sectional view of a connector according to Embodiment 1. FIG. It is a fragmentary sectional view which shows an example of the medical device used for administration of the drug for anesthesia. It is a fragmentary sectional view which shows an example of the medical device used for administration of an enteral nutrient. FIG. 5 is a cross-sectional view showing a syringe connected to the medical device used to administer the anesthetic drug shown in FIG. 4; It is a figure which shows the cross section of the medical device used for administration of the enteral nutrient shown in FIG. 5, and a syringe. 10 is a perspective view of a connector according to Embodiment 2. FIG. It is sectional drawing of the connector according to Embodiment 2 which follows the IX-IX line shown in FIG. FIG. 10 is a cross-sectional view showing a syringe according to Embodiment 2 connected to a medical device used for administration of enteral nutrient. It is a figure which shows the cross section of the medical device used for administration of the chemical | medical agent for anesthesia shown in FIG. 4, and a syringe. It is the table | surface which showed the failure torque of the connector in an Example and a comparative example.

  Hereinafter, the syringe 1 in the embodiment will be described based on the drawings. In the embodiments described below, the same or substantially the same configurations are denoted by the same reference numerals, and redundant description will not be repeated. Each configuration of the embodiments described below may be selectively combined as appropriate.

Embodiment 1
<Syringe 1>
FIG. 1 is a perspective view of a syringe 1 according to the first embodiment. FIG. 2 is a partial cross-sectional view of the syringe 1 along the line II-II shown in FIG. As shown in FIGS. 1 and 2, the syringe 1 includes a barrel 4, a plunger 5, a gasket 6, and a connector 2.

  The barrel 4 has a generally cylindrical shape. The axial direction DR1 of the barrel 4 is shown by the double arrows in FIGS. 1 and 2. In the inside of the barrel 4, a dedicated medicine 10 is accommodated. The dedicated drug 10 is a drug classified according to ISO 80 369 of the International Organization for Standardization (ISO), and is, for example, a drug for anesthesia, a drug for blood vessels, an enteral nutrient and the like.

  As shown in FIG. 2, the barrel 4 includes a nozzle 3 and an auxiliary portion 12. The nozzle 3 is formed at the tip of the barrel 4. The nozzle 3 has a tubular shape. The nozzle 3 has an outer peripheral surface 3a. The outer peripheral surface 3 a has a tapered shape in which the outer diameter of the nozzle 3 increases as it is separated from the tip end surface S of the barrel 4. The exclusive medicine 10 is discharged from the nozzle 3.

  The auxiliary portion 12 is formed in a tubular shape on the radially outer side of the nozzle 3 so as to surround the nozzle 3. A female screw 12 a is formed on the inner peripheral surface of the auxiliary portion 12.

  The plunger 5 has a shape extending in the axial direction DR1. The plunger 5 is inserted into the barrel 4. The plunger 5 is movable within the barrel 4 in the axial direction DR1.

  The gasket 6 is an elastic body. The gasket 6 is provided at the tip of the plunger 5. The gasket 6 has an outer diameter substantially equal to the inner diameter of the barrel 4. The barrel 4 has an inner circumferential surface 4a. The gasket 6 has an outer peripheral surface 6a. The outer peripheral surface 6a is in close contact with the inner peripheral surface 4a. The gasket 6 is movable together with the plunger 5 in the axial direction DR1 in the barrel 4.

  By pressing the plunger 5 in the direction (arrow A direction in FIG. 2) approaching the nozzle 3, the gasket 6 moves in the arrow A direction together with the plunger 5 while sliding on the inner peripheral surface 4 a. By the movement of the plunger 5 and the gasket 6, the special agent 10 contained in the barrel 4 is discharged from the nozzle 3, and the special agent 10 is supplied to the medical device 30 described later.

<Connector 2>
FIG. 3 is a cross-sectional view of connector 2 according to the first embodiment. The cross section of FIG. 3 is a cross section along the line II-II shown in FIG. The connector 2 has a shape extending in the axial direction DR1. The connector 2 includes a inserting portion 9 and a connecting portion 11. The insertion portion 9 and the connection portion 11 are arranged side by side in the axial direction DR1 and are directly connected to form the connector 2 as an integral structure.

  The insertion portion 9 has a tapered shaft 9 b and an enclosure 9 f. The tapered shaft portion 9b has a tubular shape. The tapered shaft portion 9 b has an outer peripheral surface 9 g. The outer peripheral surface 9 g has a tapered shape in which the outer diameter of the tapered shaft portion 9 b is larger as it approaches the connecting portion 11.

  The enclosure 9 f is disposed in a tubular shape on the radially outer side of the tapered shaft 9 b so as to surround the tapered shaft 9 b. The enclosure 9 f has an inner circumferential surface 9 h. An insertion female screw 9a is formed on the inner circumferential surface 9h.

  The connecting portion 11 has a tubular shape. The connecting portion 11 has an inner circumferential surface 11 a. The inner circumferential surface 11 a has a tapered shape in which the inner diameter of the connecting portion 11 decreases as the inner circumferential surface 11 a approaches the insertion portion 9. The connecting portion 11 has a male screw portion 2a on the outer peripheral surface.

  As shown in FIG. 2, the connector 2 and the barrel 4 are connected by screwing the male screw portion 2 a of the connecting portion 11 and the female screw portion 12 a of the auxiliary portion 12.

  The connecting portion 11 has a joint portion 13. The bonding portion 13 refers to a portion of the inner peripheral surface 11 a of the connecting portion 11 in contact with the outer peripheral surface 3 a of the nozzle 3. The connector 2 can not be removed from the nozzle 3 by being bonded to the nozzle 3 at the bonding portion 13 by, for example, an adhesive or heat welding.

<Medical devices 30, 31>
FIG. 4 is a partial cross-sectional view showing an example of a medical device 30 used for administration of a drug for anesthesia. The medical device 30 is exclusively used for administration of a drug for anesthesia. The medical device 30 includes a flange portion 25 and a receiving portion 20. The flange portion 25 annularly extends radially outward of the cylindrical medical device 30.

  The receiving part 20 has a specific shape corresponding to a drug for anesthesia. The receiving portion 20 has a tubular shape. The axial direction DR2 of the receiving portion 20 is indicated by a double arrow in FIG. The receiving portion 20 is a portion of the medical device 30 that protrudes in the axial direction DR2 with respect to the flange portion 25.

  The receiving portion 20 has a receiving male screw portion 20a on the outer peripheral surface. The receiving portion 20 has an end face T4. The receiving portion 20 has an inner circumferential surface 20b. The inner circumferential surface 20b has a tapered shape in which the inner diameter of the receiving portion 20 increases as approaching the end face T4.

  FIG. 5 is a partial cross-sectional view showing an example of a medical device 31 used for administration of an enteral nutrient. The receiving part 21 shown in FIG. 5 has a specific shape corresponding to the enteral nutrient.

  The receiving portion 21 has a large diameter portion 21 e and a tapered shaft portion 21 d. The large diameter portion 21 e has a tubular shape. The large diameter portion 21 e is disposed radially outside the tapered shaft portion 21 d so as to surround the tapered shaft portion 21 d. A receiving female screw portion 21c is formed on the inner circumferential surface 21g of the large diameter portion 21e.

  The tapered shaft portion 21d has a tubular shape. The axial direction DR3 of the tapered shaft portion 21d is indicated by a double arrow in FIG.

  The outer peripheral surface of the tapered shaft portion 21d has a tapered surface 21f and a chamfered portion 21h. The tapered shaft portion 21d has an end face T3. The tapered surface 21f has a tapered shape in which the outer diameter of the tapered shaft portion 21d decreases as it approaches the end face T3.

  The chamfered portion 21h is connected to the tapered surface 21f and connected to the end surface T3. Similar to the tapered surface 21f, the chamfered portion 21h also has a tapered shape in which the outer diameter of the tapered shaft portion 21d decreases as it approaches the end face T3, but the taper angle (two generatrix in the cross section of the outer peripheral surface) Angle) is large.

  The medical device used for administration of the exclusive drug 10 other than the anesthetic drug and the enteral nutrient includes a receiving unit corresponding to each of the dedicated drug 10. The receiving portion has a specific shape corresponding to each of the dedicated medicines 10.

  6 is a cross-sectional view showing the syringe 1 connected to the medical device 30 used for administration of the anesthetic drug shown in FIG. The cross section of FIG. 6 is a cross section along the line II-II shown in FIG.

  Dedicated drug 10 according to the first embodiment is a drug for anesthesia, and cutting part 9 according to the first embodiment has a shape connectable to receiving part 20 of medical device 30 used for administration of the drug for anesthesia. ing.

  The minimum outer diameter of the tapered shaft 9b (the outer diameter of the portion of the tapered shaft 9b farthest from the connecting portion 11) is smaller than the maximum inner diameter of the receiving portion 20 (the inner diameter of the end face T4 of the receiving portion 20). Thus, the tapered shaft portion 9 b can be inserted into the receiving portion 20.

  The maximum inner diameter of the receiving portion 20 is smaller than the maximum outer diameter of the tapered shaft portion 9 b (the outer diameter of the portion of the tapered shaft portion 9 b closest to the connecting portion 11). The minimum inner diameter of the receiving portion 20 (the inner diameter at a portion farthest from the end face T4 of the receiving portion 20) and the minimum outer diameter of the tapered shaft 9b are substantially equal.

  The outer peripheral surface 9g of the tapered shaft 9b is in close contact with the inner peripheral surface 20b of the receiver 20 in a state where the whole of the receiver 20 is disposed in the space between the tapered shaft 9b and the enclosure 9f of the connector 2 ing. The flange portion 25 is in contact with the end surface T2 of the insertion portion 9.

  Further, the connector 2 and the medical device 30 are connected by screwing the insertion female screw 9a and the receiving male screw 20a. Thereby, the syringe 1 according to the first embodiment and the medical device 30 are connected.

  FIG. 7 is a view showing a cross section of the medical device 31 used for administration of the enteral nutrient shown in FIG. 5 and the syringe 1. The insertion portion 9 according to the first embodiment has a shape that can not be connected to a medical device used for administration of another drug that is not an anesthetic drug such as an enteral nutrient.

  The inner diameter of the end face T1 of the large diameter portion 21e is smaller than the outer diameter of the end face T2 of the insertion portion 9. The inner diameter at the end face T3 of the tapered shaft portion 21d is smaller than the minimum outer diameter of the tapered shaft portion 9b.

  As shown by a two-dot chain line in FIG. 7, the large diameter portion 21e and the surrounding portion 9f interfere with each other, and further, the tapered shaft portion 21d and the tapered shaft portion 9b also interfere with each other. Therefore, the medical device 31 used for administration of the enteral nutrient and the insertion portion 9 according to the first embodiment can not be connected.

  As a result, it is not possible to connect the medical device 31 used for administration of the enteral nutrient and the syringe 1 containing the anesthetic drug. Therefore, the syringe 1 containing the anesthetic drug can be reliably connected to the medical device 30 used for administration of the anesthetic drug.

<Vulnerable Division W>
The connector 2 has a fragile portion W whose strength is smaller than the bonding strength of the bonding portion 13. The fragile portion W is formed as a portion which is relatively thin and in which stress concentration is likely to occur. The fragile portion W is formed at the boundary between the insertion portion 9 and the connection portion 11.

  When it is attempted to remove the connector 2 once joined from the nozzle 3 and torque is applied to the connector 2, the connector 2 is broken starting from the fragile portion W with a torque smaller than the joint strength of the joint 13. When the fragile portion W is broken, the insertion portion 9 and the connection portion 11 are divided.

  By providing the fragile portion W, if it is attempted to remove the connector 2 once joined, the connector 2 is broken, so that the connector 2 can not be reliably removed from the nozzle 3. Thus, once the connector 2 corresponding to the medical device used for administration of the special agent 10 contained in the syringe 1 is joined to the nozzle 3, replacement of the connector 2 becomes impossible.

  Therefore, the syringe 1 containing the exclusive drug 10 can be reliably connected to the medical device used for administration of the exclusive drug 10. Furthermore, the connector 2 can be removed from the barrel 4 after administration of the exclusive drug 10 to prevent the barrel 4 from being reused.

Second Embodiment
FIG. 8 is a perspective view of connector 2 according to the second embodiment. FIG. 9 is a cross-sectional view of connector 2 according to the second embodiment, taken along line IX-IX shown in FIG. The connector 2 according to the second embodiment has a shape extending in the axial direction DR1. The connector 2 includes a inserting portion 9 and a connecting portion 11. The insertion portion 9 and the connection portion 11 are arranged side by side in the axial direction DR1 and are directly connected to form the connector 2 according to the second embodiment as an integral structure.

  The connector 2 according to the second embodiment further includes a flange portion 26. The flange portion 26 is provided at the proximal end of the connecting portion 11 and extends annularly outward in the radial direction of the tubular connector 2. The insertion portion 9 protrudes with respect to the flange portion 26 in the axial direction DR1. The insertion portion 9 has a tubular shape.

  The inner peripheral surface of the insertion portion 9 has a tapered surface 9 d and a chamfered portion 9 e. The tapered surface 9 d has a tapered shape in which the inner diameter of the insertion portion 9 decreases as the connection portion 11 is approached. The chamfered portion 9e is connected to the tapered surface 9d.

  Similar to the tapered surface 9d, the chamfered portion 9e also has a tapered shape in which the inner diameter of the insertion portion 9 decreases toward the connecting portion 11, but the taper angle (two generatrices in the cross section of the inner circumferential surface) Angle) is large.

  The insertion portion 9 has an outer peripheral surface 9i. A protrusion 9 c is provided on the outer peripheral surface 9 i. The protrusion 9c protrudes radially outward from the outer peripheral surface, and extends in a spiral shape corresponding to the bottom of the receiving female screw 21c.

  FIG. 10 is a cross-sectional view showing a syringe 1 according to Embodiment 2 connected to a medical device 31 used for administration of an enteral nutrient. The cross section of FIG. 10 is a cross section along line IX-IX shown in FIG.

  Unlike Embodiment 1, in Embodiment 2, dedicated drug 10 is an enteral nutrient. The insertion portion 9 according to the second embodiment has a shape connectable to the receiving portion 21 of the medical device 31 used for administration of the enteral nutrient.

  The minimum outer diameter of the tapered surface 21f (the outer diameter of the portion closest to the end face T3 of the tapered surface 21f) is smaller than the maximum inner diameter of the tapered surface 9d (the inner diameter of the portion farthest from the connecting portion 11 of the insertion portion 9). Thus, the tapered shaft portion 21 d can be inserted into the insertion portion 9.

  Since the outer diameter of the chamfered portion 21 h is smaller than the minimum outer diameter of the tapered surface 21 f, the tapered shaft portion 21 d can be easily inserted into the insertion portion 9.

  The maximum inner diameter of the tapered surface 9d is smaller than the maximum outer diameter of the tapered surface 21f (the outer diameter at a portion farthest from the end surface T3 of the tapered surface 21f). The minimum inner diameter of the tapered surface 9d (the inner diameter of the portion closest to the connecting portion 11 of the insertion portion 9) and the minimum outer diameter of the tapered surface 21f are substantially equal.

  The tapered surface 21f of the tapered shaft portion 21d and the tapered surface 9d of the inserted portion 9 are in close contact with each other with the entire insertion portion 9 being disposed in the space between the tapered shaft portion 21d and the large diameter portion 21e of the medical device 31. doing. Further, the chamfered portion 21 h of the tapered shaft portion 21 d is in close contact with the chamfered portion 9 e of the insertion portion 9. The flange portion 26 is in contact with the end surface T1 of the large diameter portion 21e.

  Moreover, the connector 2 and the medical device 31 are connected by the projection part 9c engaging with the receiving female screw part 21c. Thereby, the syringe 1 according to the second embodiment and the medical device 31 are connected.

  Unlike the first embodiment, the male screw portion 2a shown in FIG. 2 is not formed in the connecting portion 11. However, as in the first embodiment, the connector 2 has, for example, an adhesive or heat welding at the bonding portion 13. Since the nozzle 3 is joined to the nozzle 3 and the like, the nozzle 3 can not be removed.

  FIG. 11 is a view showing a cross section of the medical device 30 used for administration of the anesthetic drug shown in FIG. 4 and the syringe 1. The insertion portion 9 according to the second embodiment has a shape that can not be connected to a medical device used for administration of another drug that is not an enteral nutrient, such as an anesthetic drug.

  The maximum inner diameter of the insertion portion 9 is smaller than the outer diameter of the receiving male screw 20a (the diameter of the tip circle of the receiving male screw 20a).

  As shown by the two-dot chain line in FIG. 11, the receiving male screw portion 20a and the insertion portion 9 interfere with each other, so that the medical device 30 used for administration of a drug for anesthesia can not be connected with the insertion portion 9 according to the second embodiment. ing.

  Thereby, the medical device 30 used for administration of the drug for anesthesia can not be connected to the syringe 1 containing the enteral nutrient. Therefore, also in connector 2 according to the second embodiment, similarly to connector 2 according to the first embodiment, syringe 1 containing the enteral nutrient can be reliably connected to the medical device 31 used for administration of the enteral nutrient. An effect is obtained.

  The shape of the barrel 4 according to the first and second embodiments is the same. Therefore, when newly manufacturing the syringe 1 having the insertion portion 9 connectable to only the receiving portion having a specific shape, it is sufficient to change the shape of the insertion portion 9.

  Since the barrel 4 having a common shape can be used, it is sufficient to newly manufacture the connector 2 when newly manufacturing the syringe 1 connectable only to the medical device including the receiving part having the specific shape, and hence the manufacturing cost is reduced. The increase can be suppressed.

  Examples will be described below. Five connectors 2 having insert portions 9 according to the first embodiment were respectively produced as Example 1 and Example 2, and each was joined to the barrel 4. As a comparative example 1, five connectors which do not provide a weak part were produced, and each was joined to a barrel.

  In the examples and comparative examples, the connector and the nozzle were joined using a UV cure adhesive. The failure torque of the joint was 170 [cN · m].

  The volume of the barrel in the syringe of Example 1 and Comparative Example 1 was 20 mL. The volume of the barrel 4 in the syringe 1 of Example 2 was 2.5 mL.

  A torque was applied to the connectors in the example and the comparative example in the direction in which the connectors were removed from the nozzles, and the failure torque of each connector was measured.

  FIG. 12 is a table showing damage torques of the connectors in the example and the comparative example. The failure torques of the connectors in the example and the comparative example were measured, respectively, and the average value was calculated. In Example 1 and Example 2, the fragile portion W was broken and the connector 2 was broken at a value smaller than the breakage torque (170 [cN · m]) of the joint 13.

  On the other hand, in the connector of Comparative Example 1 in which the fragile portion was not provided, the connector was broken when a torque of 160 to 170 [cN · m] acted. In consideration of the variation in the quality of the connector, it can not be said that the connector is necessarily broken at a joint failure torque (170 [cN · m]) or less.

  By providing the fragile portion W, it is possible to damage the connector 2 when it is attempted to remove the connector 2 once joined, so it is shown that the connector 2 can not surely be removed from the nozzle 3 It was done.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  Reference Signs List 1 syringe, 2 connector, 3 nozzle, 4 barrel, 5 plunger, 6 gasket, 9 insertion portion, 10 dedicated medicine, 11 connection portion, 12 auxiliary portion, 13 joint portion, 20, 21 receiving portion, 25, 26 flange portion, 30, 31 Medical equipment, W vulnerable part.

Claims (3)

A syringe connected to a medical device including a receptacle having a specific shape corresponding to the special agent that is exclusively used for administration of the special agent, and supplies the special agent to the medical device,
A cylindrical barrel including a nozzle capable of containing the special agent and from which the special agent is discharged;
A plunger movable in an axial direction of the barrel within the barrel;
A gasket having an outer diameter substantially equal to the inner diameter of the barrel and provided at the tip of the plunger;
A connector non-removably joined to the nozzle;
The syringe has a shape that can be connected to a receptacle having the specific shape and can not be connected to a medical device used for administration of another drug that is not the dedicated drug. The connector has a joint at a portion where the connector and the nozzle are joined,
The syringe according to claim 1, wherein the connector has a fragile portion whose strength is smaller than that of the joint.   The syringe according to claim 2, wherein the fragile portion breaks when a torque equal to or greater than a specified value acts on the connector.

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