KR20060014421A - Syringes with restrictor - Google Patents

Abstract

The barrel (10) of a hypodermic syringe has an open end connectable to a retractable injection needle unit via a mounting portion (28) of the needle unit which screws into a collar (26) at the open end of the barrel. Located internally within the barrel, adjacent its open end, is a restrictor (14) in the form of a resiliently deformable disc having a central opening (16). The disc is flat and has a diameter which is slightly greater than the internal diameter of the barrel so that, when the disc is pressed into the barrel, it takes up a slightly conical set. This facilitates securing the washer in position in the barrel. The opening (16) is sufficiently small so as ordinarily to retain liquid within the barrel by virtue of surface tension effects. This prevents liquid drawn into the barrel by means of a filling needle unit from "glugging" out of the barrel while the filling needle unit is being replaced by the injection needle unit. The opening (16) is also adapted to allow passage of the needle (30) and its mounting hub (32) into the barrel and hollow plunger upon actuation of the retractable needle unit at the completion of an injection stroke of the plunger.

Description

Syringe with limiter {SYRINGES WITH RESTRICTOR}

The present invention relates to fitting needle parts to the outer cylinder of a subcutaneous or other syringe and more particularly to the structure of the outer cylinder.

It is common to fit a filling needle into a syringe for the purpose of drawing liquid from the vial with a rubber lid to the outer cylinder of the syringe by contraction of the plunger, the rubber lid being perforated by the filling needle. After changing the injection the intermediate needle is separated and replaced by a needle for administering the medicine to the patient. It is necessary to change the needle to meet the needs of the patient.

While changing the needle, the syringe barrel is configured in the form of a wide open end to allow for needle contraction, with care being taken through the open end of the barrel when the barrel is turned over so that the open end faces downward. The contents of the syringe are spilled.

With respect to sealing the open end of the outer cylinder according to specification GB-A-2 356 144, the sealing consists of the form of a lid fitted to the outside over the open end of the outer cylinder, It has a central hole small enough to retain but extends deformably to allow movement of the rear end to the needle hub for connection with the outer cylinder.

It is an object of the present invention to provide a restrictor for the open end of a syringe barrel that simply fits the filling and injection needles into the outer cylinder to overcome the above mentioned problems.

According to the present invention there is provided an outer cylinder for using a retractable needle assembly comprising a mounting hub and a needle for the needle, the outer cylinder being provided with a restrictor located near or within the open end of the outer cylinder. The restrictor has one or more holes adapted to move the mounting hub and the needle into the outer cylinder and small enough to retain liquid at normal levels within the outer cylinder.

In this way, liquid is injected into the outer cylinder, for example by means of a filling needle unit, to prevent "glugging" leaking from the outer cylinder, while at the same time the filling unit is replaced with an injection needle unit, Leakage is limited by moderately small holes or surface tension effects associated with the holes to accommodate the liquid.

In particular, if the outer cylinder is manipulated before the filling needle unit is detached and the shrinkable infusion needle unit is engaged, the loss of drug “glugging” from the outer cylinder is significantly reduced by the restrictor. In water-based drugs having a viscosity of about 1 cP and a surface tension of about 73 dyne / cm at a temperature of 20 ° C., when the outer cylinder is directed downward, the restrictor is generally used and does not vibrate vigorously To prevent leakage.

The hole has a variety of shapes, in which it is made to include a passage through which the liquid can move.

In general, the retractable injection needle unit is capable of automatically retracting by automatically disengaging the hub from the holder, the mounting portion for connecting to the outer cylinder, the needle, a mounting hub for the needle, a holder for supporting the hub in a forward position, the holder And the mounting hub and needle for inserting backward from the front position into the outer cylinder.

Liquids are generally used at temperatures of 20 ° C. with viscosities ranging from 0.6 to 1 cP and surface tensions ranging from 20 to 100 dyne / cm.

The plunger is the cavity and the retraction device for inserting the needle into the cavity plunger.

 The retraction device inserts the hub and needle into the hollow plunger and the front end of the plunger moves forward in the plunger to insert the needle and mounting hub into the cavity plunger by the retraction device. And a detachable member removed from the front end at the end of the.

The restrictor is a component integrally formed with or separated from the outer cylinder.

The restrictor is deformable, for example elastically deformable, and is located in an area of one or more holes to allow movement of the needle and mounting hub.

The restrictor includes a seal formation that interacts with the member of the needle unit so that the liquid discharged from the outer cylinder is trapped in the needle during the injection stroke of the plunger.

The hole may be provided with one or more inwardly directed projections or comprise a single circular hole to enhance the function of the restrictor to prevent leakage of liquid from the outer cylinder. For example, the surface of the hole is in the form of a layering formed by the protrusions.

The protrusions or protrusions are flexible to allow movement of the needle and hub.

In an embodiment of the invention, the aperture of the restrictor is sized to allow the hub and needle to move while the needle is retracted.

According to another embodiment, the aperture is formed to a size that is not sufficient for the hub and needle to move. In such embodiments, the restrictor is formed with a portion that is broken or removed to allow movement of the hub and the needle while the needle is retracted. In another alternative, the restrictor is separated as it is made of a fragile or brittle material, and this method no longer blocks the needle and hub when needle shrinkage is required.

The restrictor includes an outer portion and an inner portion, the inner portion being disengaged or cut away from the outer portion to create an opening large enough to allow movement of the needle and hub during needle contraction.

The inner and outer portions are bounded by lines or zones of weakness in the inner portion that are separable from the outer portion to enable needle contraction.

The inner and outer portions are alternatively connected at a molding interface between the inner portions to be removed or cut from the outer portion, such as to reach or approach the completed state of the front stroke.

The inner portion is provided with the hole.

The inner part is in the shape of a tube formed by a passage provided with the hole.

According to one embodiment of the invention, the restrictor comprises a disk located inside the outer cylinder.

When positioned in the outer cylinder, the disk is configured in a conical shape including a "tip" and a "tip" with a hole located in front of the outer surface of the disk.

The conical shape of the disk faces an obtuse angle of 140 °.

The disks are thin, flat when manufactured and can be manufactured, injected or compression molded by technicians and cut or compressed from strips or sheets so that the disks are occupied in the shape of a cone but without the use of hands when manufactured. Lose.

Alternatively, the disc is generally manufactured in a conical shape by molding.

The holes in the disk are flat circular or otherwise configured. For example, the surface of the disk is provided with one or more fingers in an effect of reducing the cross-sectional area of the hole to enhance the function of sealing the leak of liquid from the outer cylinder.

The surface of the hole is configured in the form of a axial as by one or more fingers as mentioned above. The surface of the hole is provided with the shape of fingers and / or axiality, and the device provides flexibility for the finger or fingers or other protrusions to allow movement of the needle and hub.

The disc has the function of self-retaining when inserted. If the outer surface is desired to be connected in a groove or with a shoulder at the wall of the outer cylinder, the disk is prevented from being separated.

The outer surface of the disk is axially formed to assist deformation when one or more fingers are provided and / or inserted into the outer cylinder and / or assists in retaining inserted into the outer cylinder.

In general, the material of the disc (or other form of limiter) consists of a deformable polymer material or elastomeric material suitable for medical use. For example, the material is one suitable for exposing non-toxic ethylene gas and / or gamma radiation.

The device is such that the rear end of the needle or hub unit is positioned in front of the disk when the needle and hub assembly is fitted to the outer cylinder.

According to another embodiment of the invention, the restrictor is in the form of an annular flange, which is selectively rearward facing and protrudes toward the inside of the outer cylinder, the flange being a hole small enough to hold liquid in a normal state within the outer cylinder. Is formed. This embodiment is particularly suitable for outer cylinders with relatively small filling capacities on the order of 1 ms.

The flange is deflectable radially elastically outward.

The flange is integrally formed with the outer cylinder proximate the open end.

The functions of the flange as a lip are sealed by acting together with the member of the needle unit such as to interact with the restrictor of the contraction injection needle unit.

Within an embodiment of the invention, the restrictor is reticulated or perforated to prevent liquid “glugging” leaking from the outer cylinder.

 The restrictor is formed in an array of holes distributed over the cross section of the outer cylinder.

The restrictor is brittle or brittle, formed or easily broken, formed of one or more lines or zones composed of a weak portion to break any portion to form the hub assembly and the required holes to allow movement of the needle while the needle is retracted. Made of material

Within another embodiment of the invention, the restrictor generally comprises an inner portion and an outer portion connected together and are restrained from each other when the plunger approaches or approaches the completion of the front stroke.

The outer portion allows only forward movement in a limited range relative to the outer cylinder or is limited to forward movement.

After releasing the inner member from the outer member, the inner subsidiary forms an opening in a restrictor large enough to allow movement of the needle or hub assembly during needle contraction.

The inner member is provided with a central passageway for the liquid coming out of the outer cylinder and into the outer cylinder, the passage retaining liquid in the outer cylinder in a normal state when no pressure is applied to the plunger to move forward. Small enough to do.

The restrictor is provided with an additional opening or openings in their natural form on the outer portion.

According to the disclosure in WO 02/87669, the two parts of the limiter are connected to each other by molding the other part in the presence of one part by double injection molding.

Alternatively the two parts are connected to each other by means of a fragile piece of material which is just separated to allow the inner member to be released from the outer member when required. For example, the restrictor is molded from a plastic material which is thin webs of plastic material connecting the two parts.

The hub and limiter are formed by double injection when plastic molding, and according to the disclosure in WO 02/87669 the limiter is axially constrained like the hub.

Like the device, the injection needle is connected to the outer cylinder via a unidirectional coupling formed by the needle unit and the parts connected internally on the outer cylinder such that the injection needle is connected to the outer cylinder not separated from the outer cylinder. There is damage to the parts.)

The unidirectional connection means comprise a bayonet-type connection or threaded connection between the outer cylinder and the male and parts of the injection needle unit.

The unidirectional connecting means comprise a screw connection between the female member and the male member, and within the gap above one of the members there is a visible gap between the thorn and the thread in each part, at least when the member is screwed. One elastic deformation is formed in the barbed to lock behind the end of the threaded portion at intervals in the other part of the members to prevent separation of the members. The device is disclosed in GB-A-2 353 078, the full scope of the invention being incorporated by reference.

The connection is provided on an internal threaded part vice versa or on the needle unit connected to an external thread on the outer cylinder.

1: Longitudinal sectional view which shows the outer cylinder of the medical syringe in which the unit provided with the restrictor, the filling needle, and the lid unit according to the first embodiment of the invention are fitted.

Fig. 2: A view of the outer cylinder filled with liquid and removed from the outer cylinder, similar to Figure 1;

Fig. 3: View of the outer cylinder similar to Fig. 2 but fitted with the injection needle assembly

Fig. 4: An enlarged view of the injection needle assembly fitted to the outer cylinder

Fig. 4A is a schematic diagram showing the surface of a hole formed in the restrictor.

Fig. 5: Perspective view of a syringe in which a restrictor is provided in accordance with a second embodiment of the invention, to which the retractable injection needle is connected.

6: Cross-sectional view of a syringe modified according to the embodiment of FIG.

Fig. 7: Perspective view of a fragile disc or similar type of restrictor

Fig. 8: Perspective view showing a two part restrictor provided with a passage smaller than the lateral dimension of the needle hub allowing the central member

Fig. 9: Enlarged perspective view of the restrictor shown in Fig. 8.

10: Perspective view of a restrictor including an outer portion and a central portion.

11: Enlarged perspective view of a restrictor according to the embodiment of FIG. 10.

The syringe of the present invention is a hypodermic needle syringe as shown for example in WO 02/87669 when the injectable needle unit of the retractable form is fitted. In general, such a syringe has a front end proximate to the open end of the outer cylinder while discharging liquid from the barrel and at one end is separated or provided from the front end of the syringe. Has The needle includes a papermaker, a mounting hub, and a needle for supporting the hub in a forward position, the needle is released from the papermaker and the shrinkage device is operable to operate. A needle is injected and the hub is mounted rearward from the front position with the cavity plunger. The some portion is provided from the front end of the plunger during or prior to operation of the shrinkage device. The restraint of the hub from the papermaker has the effect of coordination between the papermaker and the front end of the plunger, so that forward movement of the plunger at or near the end of the forward stroke moves the restrictor. It is effective at restraining the needle and the hub.

Referring to the drawings, the barrel 10, which is in the form of the tube of the syringe, is open at the forward end 12 and is coupled with a restrictor, which is not latex, and is elastically deformed. Possible discs, washers 14 have a central opening 16. In the knocked down state, the washer 14 is a plate with a diameter slightly larger than the inner diameter of the outer cylinder at the front end 12. When the washer 14 is pressurized into the inside of the outer cylinder, it is formed into a slightly conical shape due to the diameter slightly larger than the inner diameter of the outer cylinder. As a result, the washer is easily fixed at the front end of the outer cylinder. The washers are initially made in a conical form instead of being in a flat form. The surface of the washer 14 contacts the inner wall of the outer cylinder 10 and limits its movement backwards due to the conical shape of the washer while filling the outer cylinder.

It will be appreciated that the washer does not have to be conical while it is secured in such a way that it does not move backwards while filling the outer cylinder. In order to facilitate positioning of the washer, the outer cylinder is provided with a shoulder 18 or a groove formed in the washer 14. When the washer is located in the outer cylinder, the opening 16 is located in front of the outer surface of the washer. Although not shown, the front end of the outer cylinder is in the form of a conical end located in front of the washer and absorbs the formation of the front end of the outer cylinder when inserted.

According to FIG. 1, the outer cylinder is associated with a unit comprising a protective sheath 22 and a filling needle 20, which unit is a rear end portion of the unit 20, 22 ( It is coupled to the front end of the outer cylinder by means of a screwed connection between 24) and a collar 26 protruding forward of the outer cylinder. A user is ready to use the filling needle and pulls it into the barrel in the usual manner (not shown, but as the syringe contracts towards the rear of the barrel) and the needle 20 is inserted into another source or vial of fluid. The lid 22 is removed from the syringe when it is released. As the fluid is absorbed into the outer cylinder, it flows directly through the opening 16 into the evacuated volume of the outer cylinder at the center of the washer 14.

As a result, replacement of the injection needle unit and the filling needle unit is necessary. The filling needle unit is separated from the outer cylinder 10 (shown in FIG. 2), and then the injection needle unit is coupled to the outer cylinder. The risk of drug “glugging” of the liquid from the barrel is transferred to the washer (14) if the barrel is commonly used, such as shaking or flipping (not strenuous). Will be significantly reduced, and the opening 16 is shaped so that a small hole is formed in the chamber filled with liquid, i. In this way, during the needle replacement, the liquid is held in the outer cylinder by means of a phase washer 14 provided in the outer cylinder which is not subjected to any excessively violent shaking or actuation. Lose.

The injection needle unit comprises a mounting portion (28) for connecting to the outer cylinder, an injection needle (30) and a crown (34) composed of an injection needle (30) carried by a hub (hub) 32 (restrainer). The hub 32 and the needle 30 are deflected rearward by the spring 36 to retract into the outer cylinder at a suitable time, and engage the cavity plunger inside the plunger. According to the disclosure in WO 02/87669, the hub 32 and crown 34 are formed by a double injection molding operation so that the crown is separated to separate the crown 34 and the hub 32. Tied together until they are carried by the collar 37 of the plunger, the needle and the hub are restrained for spring injection movement with the outer cylinder and plunger. The forward movement of the collar 37 is released to the crown 34 by an elastically deformable upper washer 14 while the needle is unconstrained, but as mentioned above the invention results in the formation of the needle retracting device. It will be appreciated that is not limited, and other methods within the prior art are used to retain the hub and needle when needle shrinkage is required, and at the same time used to release the restraint.

The leading end 38 of the plunger is detached from the plunger and injected into the plunger prior to or during membrane destraining of the hub from the crown. In this connection, although not necessary, the leading end of the plunger is made by double injection in accordance with the disclosure in WO 01/42164, the entire disclosure of which is incorporated by reference.

The spacing between the front end of the washer 14 and the rear end of the crown is minimized to prevent waste of medicine. The spring 36 and the hub move freely through the opening 160 in the washer when contact is established between the moving end portion of the crown 34 and the collar 34 of the plunger and needle contraction is initiated. The hub is dimensioned as follows.

According to the disclosure in GB-A-2 353 078, the coupling between the mounting portion of the injection needle unit and the outer cylinder is a one-way coupling. The fitting of the filling needle assembly in contrast to the injection needle unit, the filling needle unit is through a similar coupling means, except for the omission of locking barbs, so that it is easily separated at the end of the work.

In the embodiment according to FIGS. 1 to 4, the openings 16 in the disc are rounded or formed into other shapes made using surface tension effects to prevent “glugging” of liquid leakage from the outer cylinder. For example, the opening 16 is formed in a castellated configuration as shown in Fig. 4A to reduce the cross-sectional area, and the protrusions extend radially inwards but are easily deflected. It does not prevent passage of the needle or hub assembly after needle contraction occurs.

Referring to the embodiment of Fig. 5, the restrictor is formed by a flange 100 or an annular projection provided inside the front end of the outer cylinder 102. The restrictor is integrally formed by the outer cylinder and the plastic molding. As shown in Fig. 5, the syringe is shown in a fitted shape as the injection needle fills and separates the outer cylinder containing the filling needle unit. In this embodiment the hub 112 and crown 108 are joined to each other by double injection at a molding interface 126, the members being bonded or fused to each other at the interface and mechanically connected Lose. Such a device is also available in other embodiments of the invention shown herein.

Prior to fitting the cover of the unit (not shown) and the injection needle unit 103, the restrictor 100 is provided with a restrictor of sufficiently small diameter to effectively prevent leakage of liquid from the filled outer cylinder. do. When the invention is improved in this way, the diameter of the opening in the restrictor 100 allows the passage of the assembly comprising the needle 110 and the hub 112 while the needle retracting device is in operation. It is decided to. As a result of this, the achievement of the present invention is to provide a syringe of a small diameter and a syringe of a small volume, such as syringes with a filling capacity of the order of 1 ml. In such a case, the diameters of the various parts are made smaller, which in general prevents the risk of spillage from the external cylinder, and the liquids within the typical viscosity range of the liquids to be administered by injection are small enough. Form a restrictor hole. Consistent with the above invention, the general properties of the liquids used in the syringes range from 0.6 to 70 cP (typically 1 cP) in fluid viscosity and from 20 to 100 dyne / cm (typically 73 dyne / cm).

Degree. The restrictor 100 shown in Fig. 5 provides the additional function of the plunger forming a seal between the inner wall surface of the outer cylinder and the crown 108, while a forward stroke is formed. It is arranged in the form of an elastic deflectable lip seal, which extends inwards and backwards and tends to be radially deflected inwards by applying pressure to enhance the sealing action. When the crown 108 is located and engages with the lip seal or limiter 100, the lip seal or limiter is radially deflected outwardly. The lip seal or limiter 100 is in a loose, unbiased state when the crown 108 is not present and the central hole is deflected outwardly by the crown 108 when the lip seal is not deflected. It is formed with a reduced diameter compared to the extended diameter.

Degree. Operation of the syringe according to 5 is shown in FIG. 3 and FIG. Similar to that shown in Figure 4, and also shown in WO 02/87669, the syringe is described in more detail. After the outer cylinder is filled, the filling needle is separated and the lip seal / limiter 100 is provided to hold the contents of the outer cylinder while waiting for the fitting of the injection needle unit. Prior to the injection of the injection, the needle cover is removed and the injection needle unit is fitted. In response to the injection of a needle into the patient and the operation of the plunger to press the contents of the outer cylinder through the needle 110, the plunger is forwarded to the crown to release the needle 110 and the hub 112. Move 108 and eventually contact. At this time, the blocking portion of the plunger is released to allow the hub and needle to contract with the cavity plunger, such as the contraction formed by the spring 116.

According to the illustration of FIG. 6, which is a variation of the embodiment of FIG. 5, the limiter 200 has the same function as an elastically deflectable lip seal, but the needle of the injection needle unit is movable while the needle contracts around its interior. In addition, an inwardly facing portion 220 is provided through the assembly of the hub 212. The portion 220 is integrally formed with the restrictor 200, and in turn is integrally formed with the outer cylinder 202. The portion 220 may be in any other shape, such as where the portion 220 consists of a axial shape or other shape that is one or more members that protrude radially inwardly larger than the other members. It is formed as an alternative central hole or central circular hole constructed.

After the outer cylinder 220 is filled by the filling needle unit, the leakage of liquid is limited by the aperture 222. Degree. According to the embodiment of 6, the central hole 222 is shown in FIG. Fig. 5, which includes syringes of larger fill volume, which is smaller than similar to that of 5. FIG. Tolerate the use of a limiter 200 of 6. The front end 224 of the plunger eventually contacts the portion 220 while the plunger 206 forms a forward stroke, and the pressure held above the plunger until the needle begins to contract (the interface Formed by the movement of the crown 208 and the deflection of the restrictor 200, the blocking portion 221 of the plunger being unconstrained when the hub is released from the crown at 226. And protrude into the cavity plunger 206 by a spring over the hub and needle. Immediately after, or essentially simultaneously with, the release of the hub from the crown, release of the blocking portion takes place earlier.

Degree. According to the embodiment shown in FIG. 7, the outer cylinder 302 is shown in FIG. 5 and FIG. A lip seal 330 is provided as shown in Fig. 6, but in this case the lip seal does not require a function such as a limiter. According to this embodiment, the individual restrictor 300 is provided with openings 332 which are drilled and reticular or otherwise formed, which allow the inflow of liquid into the outer cylinder 302 while filling the surface. The effect of tension eliminates or prevents the risk of leakage of the drug from the outer cylinder when the filling unit is separated. The restrictor 300 is in the form of a perforated or reticular disk located within the outer cylinder, and is restrained against forward movement by, for example, the inner shoulder 334 of the outer cylinder around the outer portion.

The restrictor 300 is mounted to cooperate with the plunger 306 as the plunger approaches the completed state of the front stroke, and the openings limit the assembly of the hub 312 and the needle to the restrictor position. It is formed in the restrictor 300 sufficient to move in excess. At the interface 326 the engagement is detached to release the hub from the crown and the hub or needle assembly is attached to the rim portion as the plunger reaches or approaches the completed state of the front stroke. , 340, is injected into the cavity plunger by the opening formed by the restraint of the blocking portion 338, and then a movement towards the rear of the hub and needle assembly is formed.

In order to allow the hub or needle assembly to move through the restrictor, the restrictor 300 is brittle and broken by the forward advancement of the plunger 306. For example, the restrictor 300 is formed of one or more lines or zones consisting of a weak portion for breaking any portion to form the hub assembly and the required holes to allow movement of the needle, or a department that is easily broken Made of material that is fragile or fragile.

Degree. 8 and FIG. With reference to the embodiment 9, the limiter 400 comprises a central part 450 and the outer members connected to each other in this manner at appropriate points during the forward stroke of the plunger 406. (outer part 452), wherein the central member 450 is free from the outer member 452 such that the assembly of the hub 412 and the needle (not shown) are through the spring (not shown). Injectable into the cavity plunger 406 along a central member 450. The central member 450 is provided with a passageway 454 through which liquid can move during the filling and injecting process. The passage is formed to a suitable dimension so that the liquid filled in the outer cylinder 402 is maintained in the outer cylinder by the surface tension effect for the time between removing the filling needle unit and fitting the injection needle unit. The general diameter of the passage 454 is the same as conventional Luer Fittings for syringes, which is 2.0 mm. Degree. 5 to degrees. In an embodiment according to 7, the outer cylinder is provided with a lip seal 430 for operating simultaneously with the crown 408.

In the same manner as the hub and crown disclosed in WO 02/87669, the engagement between the parts 450 and the members 452 is a two-shot molding of one or more plastic materials. It is fixed by the limiter 400 made and connected to each other at the molding interface 456. As mentioned, the coupling at the interface is a technical feature by the formation of the outline of the members at the interface and / or includes the fusion or adhesion of the material at the interface. However, other bonding arrangements are used instead than produced by double injection molding. The outer member has a conical shape or adopts a shape when inserted into the outer cylinder such that the outer periphery contacts the inner wall of the outer cylinder 402 so that the limiter 400 easily moves forward, but restricts movement to the rear. do.

In addition to the passage 454, the outer member 452 is one such as cut-away portions 458 or holes that form inlets for introducing liquid during filling of the outer cylinder. The above opening is formed. These openings 458 are shaped to prevent leakage of liquid “glugging” from the outer cylinder 402 by the effect of surface tension. Of course, during the injection operation the plunger 406 is When pressed forward, the liquid is not only discharged through the passage 454 but also by the opening 458. The openings 458 as the cutaway portion shown in Fig. 9. The radially protruding arms 460 are formed to impart additional flexibility to the outer part 452 so as to prevent backward movement and to easily move in the forward direction.

The limiter 400 is located within the outer cylinder 402 including a small clearance X. When the plunger 406 reaches completion of the front stroke during the injection process, the leading end of the rim portion 440 is initially applied to the collar 453 of the outer member 452. And at the same time the blocking portion or protrusion 438 contacts the central member 450. The forward movement of the plunger is maintained and then sent to the crown 408 by the leading end 462 of the outer portion 452 and the leading portion 464 of the blocking portion 438 to the hub ( 412 to abutment including the trailing end of 412. The central member 450 is released from the outer member 452 of the restrictor, the hub 412 is released from the outer member 452 while the various members occupy the gap X, and the hub 412 is unconstrained from the crown 408, and the blocking portion 438 is shaped to be unconstrained from the rim portion 440. In such a fixed state, the hub and needle assembly is inserted by the spring (not shown) into the cavity plunger 406 along the central portion 450 of the restrictor 400.

Degree. 8 and FIG. Similar to the embodiment shown in FIG. 10 and degrees. According to 11, the two members 550, 552 are connected by webs 566 or narrow frangible sections instead of double injection molding. The two members are made of a single plastic molding, and the webs 566 are formed by a circular arrangement of openings 558 surrounding the central member 550. A passageway 554 is provided in the central member 550 and liquid is introduced through the passage 554 and the openings 558 during filling. However, the inflow of liquid is limited by the surface tension effect to prevent liquid leaking from the outer cylinder 502 when the outer cylinder is filled and fitted to the needle injection unit.

Degree. 8 and FIG. According to the embodiment of 9, the forward movement of the plunger 506 is effective to deconstrain the various members from each other when separating the members at the interface 526, 542 and into the narrow section webs. 566 and the central member 550 inserts the needle or hub assembly back into the cavity plunger 506 by the hole formed by removing the blocking portion 538 from the rim 540. Free to be possible.

Degree. 10 and degrees. According to the eleventh embodiment, the outer member 552 is shown in the form of a conical disk comprising a continuous outer surface, but preferably FIG. 8 and FIG. The outer surface is provided with one or more cutaway portions as shown in FIG. 9.

The above description is a preferred embodiment but may be changed by those skilled in the art without departing from the scope of the invention. The features of the invention are (for example, unidirectional connections referred to in FIGS. 1 to 4) depicted as individual embodiments for clarity and provided in combination within a single embodiment. Conversely, various features of the invention are depicted within a single embodiment for the sake of brevity, and are provided separately.

Claims (36)

A barrel 10 having an open end 12 connectable to the needle unit, said needle unit comprising a mounting portion 24, 28 for connecting to said outer cylinder and said In a syringe barrel assembly comprising a restrictor 14 for an open end, The restrictor is formed of a member 14 located inside the outer cylinder 10 proximate the open end 12, the restrictor having one or more apertures 16, the one or more apertures ( and the aperture is small enough to hold liquid to a moderate degree within the outer cylinder. 2. The mounting portion 28, needle 30, and mounting hub for the needle of claim 1, wherein the mounting portion 28, needle 30, for connecting to the barrel 10 for the use of a retractable injection needle unit. (mounting hub) 32, a retainer 34 for holding the hub 32 in the forward position, a retraction mechanism 36, which is automatically capable of releasing the hub from the holder, the forward position Characterized in that it comprises at least one hole 16 formed as a passage for inserting the needle and the mounting hub into the outer cylinder from the mounting hub and the needle 30 for backwards insertion into the outer cylinder 10. Syringe barrel assembly. 3. The plunger of claim 2 comprising a plunger capable of sliding in the outer cylinder towards the open end 12 for the effect of withdrawing liquid from the outer cylinder through the needle 30, wherein the plunger Having a forward end proximate to the needle, the front end being formed for joining the restrictor 14 such that forward movement of the plunger restrains the hub 32 for the effect of release of the restraint. Syringe barrel assembly characterized in that it is moved to the holder (34) through. 4. The plunger of claim 2 or 3, wherein the plunger is in the form of a cavity, the retracting device inserts the hub 32 and the needle 30 into the hollow plunger, and the front end of the plunger. Characterized in that the plunger has a removable part 38 removed from the front end at the end of the forward movement to insert the needle and mounting hub into the cavity plunger by the retracting device. Syringe barrel assembly. 5. The mounting hub (32) and the needle (30) according to claim 2, 3 or 4, wherein at least one portion of the restrictor (14) is deformable and the portion is through the hole. Syringe barrel assembly, characterized in that located within the region of one or more apertures (16) to allow movement of. The syringe barrel assembly of any one of the preceding claims, wherein the one or more apertures (16) are formed and / or circular of one or more inwardly directed projections. 7. A syringe barrel assembly according to claim 6, wherein the surface of the at least one hole (16) is configured in a castellated configuration. 8. A method according to claim 6 or 7, wherein one of the one or more protrusions is flexible to allow movement of the needle 30 and mounting hub 32 of the retractable injection needle unit. Syringe barrel assembly. 2. The said restriction as set forth in claim 1, wherein said needle unit is formed of insufficient size to use a retractable injection needle including said mounting portion for connecting to said outer cylinders 402,502, needles and mounting hubs 412,512. The one or more holes 454,554 of the machine 400 allow the mounting hub 412, 512 and the needle to move while the needle contracts, and the restrictor 400 includes two separable portions 450,550. One of said portions is movable to said mounting hub and passage of said needle while said needle contracts. 10. The method of claim 9, wherein the restrictor 400 includes an inner portion 450, 550 and an outer portion 452, 552, wherein the inner portion is mounted to the mounting hub 412, 512 while the needle contracts. And a releasable or detachable barrel assembly from the outer portion to produce an opening large enough to allow movement of the needle. 11. The inner portion 450,550 and outer portion 452,552 are bounded by lines or zones of weakness in the inner portion that are separable from the outer portion to enable needle contraction. Syringe barrel assembly, characterized in that. 12. A syringe barrel assembly according to claim 11, wherein the fragile line or zone is formed by one or more webs (566) of material connecting the outer and inner portions. 11. The syringe barrel assembly of claim 10, wherein the inner and outer portions are connected at a molding face (456) between the inner portion (450) that is removable from the outer portion (452). 14. A syringe barrel assembly according to claim 10, 11, 12 or 13, wherein said at least one hole (454,554) is arranged in said inner portion. 15. A syringe barrel assembly according to claim 14, wherein the inner portion (450,550) is configured in a tubular shape with a passageway (454,554). The syringe barrel assembly according to any one of the preceding claims, wherein said restrictor (14,400) or said outer portion (452,552) comprises a disk. 17. A syringe barrel assembly according to claim 16, wherein the disk is formed into a generally conical shape comprising an apex located in front of an outer surface of the disk and the holes (16,454,554) at the tip of the disk. 18. A syringe barrel assembly according to claim 17, wherein the conical shape of the disk (15,452,552) is subtend at an obtuse angle of 140 degrees. 19. Syringe barrel assembly according to claim 17 or 18, characterized in that the disk (14,452,552) occupies a conical shape when positioned in the outer cylinder (10,402,502) and is made of a thin and flat disk. 20. The device according to claim 16, 17, 18 or 19, characterized in that the restrictor is a separate member (14, 400) formed to self-retain in the outer cylinder when located in the outer cylinder. A syringe barrel assembly. 21. A syringe barrel assembly according to claim 20, wherein said surface of said restrictor is connected to a shoulder or inside of a hole in a wall of outer cylinders (10,402,502) to prevent said disk from being removed. . 22. The method of claim 21, wherein the outer surface of the restrictor is formed to be veneered to aid retention and / or to aid deformation during insertion into the outer cylinder 10,402,502 and / or one or more fingers. Syringe barrel assembly, characterized in that formed by). The syringe barrel assembly according to any one of the preceding claims, characterized in that the restrictor (14,400) is made of elastomeric or deformable polymer material suitable for medical use. 2. The needle assembly of claim 1, wherein the needle unit includes the mounting portion for connection to the outer cylinder 302, the needle and the mounting hub 312, so that the one or more apertures may be used for the retractable injection needle unit. Insufficiently sized to allow movement of the mounting hub 312 and the needle when it is retracted, the limiter 300 is made of a fragile or other fragile material such that the mounting hub moves and the needle Syringe barrel assembly, characterized in that when the shrinkage is broken. The outer cylinder (102,202,302,402,502) according to any one of the preceding claims, wherein the restrictor comprises a sealing formation (100,200,330,430,530) that interacts with the members (parts 108,208,308,408,508) of the needle unit during the injection stroke of the plunger. The liquid discharged from the syringe barrel assembly is characterized in that it is trapped in the needle (passageway) in the needle. 26. A syringe barrel assembly according to claim 25, wherein said seal formation includes an annular flange projecting rearward and projecting toward the interior of said barrel. 27. A syringe barrel assembly according to claim 26, wherein said flange (100,200) is formed with said aperture small enough to hold liquid to a moderate extent within said outer cylinder. 28. A syringe barrel assembly according to claim 26 or 27, wherein said flange is resiliently deflectable radially outwardly radially outwardly relative to said outer cylinder. 29. A syringe barrel assembly according to claim 26, 27 or 28, wherein said flange is integrally formed in said outer cylinder. 30. The needle as claimed in claim 26, 27, 28 or 29, wherein the function of the flange as a lip interacts with the limiters 108, 208, 308, 408 and 508 of the contraction injection needle unit. A syringe barrel assembly, characterized in that it is sealed by acting with a member of the unit. The syringe barrel assembly according to any one of the preceding claims, wherein said restrictor (300,400) is reticulated or perforated to form said apertures (332,458). 32. A syringe barrel assembly according to claim 31, wherein said restrictor is formed in an arrangement of holes (332) distributed over a cross section of said barrel (302). The injection needle unit according to any one of the preceding claims, wherein the injection needle unit is connected to the outer cylinder 10 via one-way coupling means formed by interfitting the needle unit and the parts of the outer cylinder. Syringe barrel assembly, characterized in that the injection needle unit assembled to the outer cylinder can not be separated from the outer cylinder. 34. The bayonet-type connection according to claim 33, wherein the unidirectional connecting means is a bayonet-type connection between the outer cylinder 10 and the female and male of parts of the injection needle unit, or A syringe barrel assembly comprising a threaded connection. 12. A syringe barrel assembly according to any one of the preceding claims, having a syringe barrel assembly, at least two separate needle units selectively connectable to the open end 12 of the barrel, the mounting units for connecting to the barrel. Syringe kit characterized by having (24,28). 36. The syringe kit of claim 35, wherein said needle units comprise a retractable infusion needle unit and a filling needle unit.

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