JPH05503649A - syringe with retractable needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] syringe with retractable needle The present invention relates to a syringe.

Traditional syringes have a cylindrical body with a piston sliding inside, and a The tip base of the main body supports a cylindrical protrusion for fitting the needle mandrel. . In principle, syringes and needles should be disposed of after one use, and should not be reused. If this occurs, there is a risk of transmitting diseases (AIDS, viral hepatitis).

Therefore, injection devices have been designed to be unusable after one use. , the syringe for this purpose has a cylindrical end piece extended with a cylindrical projection, These assemblies are loosely supported relative to each other, while the pistons are thruster that separates the cylindrical projection of the needle and locks it within the needle mandrel during injection engagement of the jaws on the side of the tubular process with the jaws in the mandrel cavity. This makes the needle unusable.

However, even with this non-reusable needle, accidents (nursing or cleaning personnel) (handling) or by accident (piercing at the beach or in a public place). There is a risk of contracting the disease due to the puncture after shooting.

The aim of the invention is to eliminate this drawback and for this purpose - Needles that are deemed unusable after use are placed inside the syringe body, which serves as a waste disposal container A retractable syringe is provided.

This eliminates any fear of contaminated punctures, even by accident. Ru.

The body of the syringe according to the invention comprises an outer cylindrical end piece at its distal base. Ru.

According to one feature of the invention, this end piece has a cylindrical outlet at its tip. terminated by an edge delimiting the needle, the inside diameter of the edge being the outer diameter of the needle mandrel. It is slightly larger than the diameter. This edge acts as a stopper. It is.

According to another feature of the invention, the outer cylindrical end piece has an inner rear extension. Both are similarly cylindrical and have a plurality of longitudinal slots arranged parallel to the axis. child The slots extend around the barrel periphery to form a plurality of flexible tabs terminating in ridges. The surface is divided into sections, the number of tabs is arbitrary, and the slots separating them are The number of edges equal to the number of points is characteristic, and the longitudinal section of the edge has a trapezoidal rectangular shape. has been achieved. The outer long side of this shape runs along the corresponding tab; The inner shorter side of is of sufficient size to be connected to the longest non-parallel side. There is. The shortest non-parallel side is perpendicular to the tab 7 and serves as a stop. It is. The region of the cylindrical rear extension with the flexible tab has an inner A slight bulge may be formed to prevent leakage from the cylindrical movable member.

According to another feature of the invention, the outer tubular end piece and its inner rear extension are It receives an empty cylindrical movable member, and the end of the movable member remote from the base of the syringe tip The part supports the cylindrical base of the cylindrical protrusion for instrument mounting, and these parts ensure a leak-free mutual connection. A loosely held structure is formed.

The cylindrical movable member itself consists of two parts. In other words, the front part (for mounting the meter) This is the outer cylindrical end piece of the it (extended by a cylindrical projection) This is the part corresponding to the exit orifice of the The outside diameter is slightly smaller than the outside diameter of the needle mandrel. The inside diameter is the boundary of the cylindrical cavity, and the diameter of the cavity is is slightly larger than the cross-sectional diameter of the cylindrical portion of the needle attachment cylindrical projection.

・The rear part that forms the main body of the cylindrical movable member The outer diameter is greater than the inner diameter of the outer cylindrical end piece within which this rear section slides. Although slightly smaller, the hole at the tip of the exit orifice of the outer cylindrical end piece of the syringe The edge is slightly larger than the inner diameter of the edge, so that the edge extends from the rear to the front of the cylindrical movable member. This is to act as a stopper to prevent movement in the opposite direction.

The middle part of the surface of this rear part is made of rubber or plastic for complete leak-proofing. A flexible seal is supported, which is a flexible seal of the inner cylindrical extension. It is arranged to be opposite to the bulge in the joint area with the sible tab. The tab is separated If not, the bulge will rub against the seal to achieve leak-proofing during injection and prevent injection from occurring. When the tabs finally separate, the seal is released, which causes the movable member to engage the tabs. It is easier to slide against.

The inner hole surface of this rear portion is provided with a plurality of annular bulges that form hooking jaws. ing.

According to another feature of the invention, the tip of the piston is provided at the tip facing the base of the syringe tip. The columnar projections are divided into several parts, namely: ・piston adjacent segment with relatively large cross section) and ・intermediate size section an intermediate segment having a surface and carrying a hooking jaw; ・Distal segment with a narrow cross section and terminating in a small jaw forming a grasping part [・, It consists of

According to another feature of the invention, the piston-adjacent segment of the protrusion is arranged in said cylindrical movable part. It has a cross section that is larger than the outer diameter of the material, and its length is enough to push the piston of the syringe until it reaches the end of its movement. The length is such that the end face of the segment comes into contact with the rear portion of the cylindrical movable member when It is. This segment forms a shoulder, and the end face of the shoulder The end face and the cylindrical circumferential surface of the segment protruding from the piston are aligned with the syringe piston. During movement, before the syringe piston reaches the end of its movement, the inner self of the tip base It is molded in such a shape that it can come into contact with the outer surface and the inner circumferential surface of the projecting edge, respectively. Ru. Additionally, this relatively large cross-sectional segment is located between the flanges of each flexible tab. When the tabs are engaged and separated, the stopper formed by the protruding edge opens and the cylindrical movable The member can now be moved from the front to the rear.

According to another feature of the invention, said intermediate segment projecting from the piston has a cylindrical shape. From the hole diameter of the hollow space of the cylindrical movable body so that it can engage and slide inside the movable body. also has a slightly smaller cross-section, and this intermediate segment is where the syringe piston is located. Before reaching the end of the movement, the tip of the intermediate segment touches the rear end of the needle attachment tube. It has a length that it reaches and stops. The syringe piston moves through the travel path and is pushed up to the When the middle segment acts as a thruster, it pushes the outer end piece forward. A cylindrical movable part whose forward movement is locked by a stopper formed at the joint part. Separate the connection between the material and the cylindrical protrusion for attaching the needle. This intermediate segment is It has an annular enlarged part forming a jaw, and the hooking jaw part is attached to the tubular movable member. The cylindrical movable member engages similar jaws arranged in opposite directions on the inner surface of the cavity. When released by the separation action of the flange and the piston is pulled backwards, the cylindrical The movable member can be retracted. The intermediate segment is finally The ribs are warped in the long plane direction, and the piston remains when it reaches the end of its movement. I feel like I can wash my body off at night.

According to another feature of the invention, said tip segment projecting from the piston is provided with an instrumentation of the inner hole of the cylindrical projection so as to be able to engage with and slide within the cylindrical projection. It has a cross section slightly smaller than the diameter, and its length is slightly longer than the cylindrical projection. It has become. This tip segment has a hooking jaw at its tip. It has a forked shape to pull the needle backward during the retraction process of the piston after injection. It is designed to form a gripping hook.

As with the intermediate segment, the distal segment is also longitudinally ribbed. Allowing droplet flow that remains at the end of the injection.

The piston may be provided with a thread on its plunger side. The piston can be unscrewed after use, as is done with syringes. It can also be done. In addition, the protective cap of the needle includes the outer cylindrical endpoint of the syringe. It is also possible to provide a plug that fits over the end of the container and acts as a container. It is also possible to prevent the needle drawn into the syringe body from escaping.

The principle of the syringe according to the invention, which is equipped with a needle that can be retracted after use, is as follows: It is understood that this feature can be achieved by partially combining the features of Tsutomu's syringe. For example, a low volume syringe in the form of an insulin or subcutaneous injection. Due to its dimensions, it is not possible to use a cylindrical needle without a removable needle with a mandrel. Designed with a needle integrally attached to a movable member, in which case The diameter of the exit orifice of the outer flll II-shaped end piece can be significantly reduced. and omit the protruding tip segment from the piston and instead use a A middle segment with hooking jaws allows each tubular member to have an integral needle. It is also possible to perform needle retraction.

To illustrate the invention by way of a non-limiting example, FIG. 1 shows a syringe according to the invention. A schematic longitudinal cross-sectional view of the syringe, a partially enlarged view of the tip of the syringe, and a front cross-sectional view along the AA'' line. It is a front view, Figure 2 shows a schematic longitudinal section of the same syringe as in Figure 1 at the end of the injection and injection. They are a partial enlarged view of the distal end portion of the syringe and a front sectional view of the same syringe along AA'', Figure 3 is a schematic longitudinal cross-sectional view of the syringe at each stage of injection, 3a is at the start of injection, 3b is During the injection, 3C shows the end of the injection, 3d, 3e, 3f show the syringe after the injection, FIG. 4 is a schematic vertical cross-sectional view of parts constituting the syringe according to the present invention, 5.6.7 and 8 respectively longitudinal sections of two embodiments of a syringe according to the invention It is a schematic diagram.

FIG. 1 shows a syringe according to the invention empty, ie at the beginning of an injection, with the piston 2 slides inside the syringe body l, which body has an outer cylindrical end piston at its distal base 3. supporting a base 4 whose orifice 5 terminates in an edge 6 and The slot 8 allows the piece 4 to have a plurality of flexible plates terminating in a rectangular trapezoidal ridge 10. It is equipped with an inner cylindrical extension part 7 divided into two cylindrical tabs 9, and the trapezoidal shape of the projecting edge is The shortest non-parallel side 11 of the has a sufficiently long non-parallel side 13 that widens rearward and extends in a tapered shape. Flexi The inner peripheral surface of the base of the flexible tab 9 has an enlarged portion 14 and is supported by a cylindrical movable member 16. The front portion 17 of the cylindrical movable member is leak-proof with the annular seal 15 has an outer diameter slightly larger than the outer diameter of the mandrel 19 of the injection needle, and its inner diameter It is slightly larger than the outer shape of the cylindrical portion of the meter mounting cylindrical projection 20 protruding from this.

The rear portion 22 of the movable tubular member 16 has a tubular end piston within which it slides. has an outer diameter slightly smaller than the inner diameter of the bases 4 to 7; however, this outer diameter is From the inner diameter of the edge portion 6 that constitutes a stopper that prevents the forward movement of the material 16 is large, and the backward movement of the cylindrical movable member is prevented by the trapezoidal protrusion 10. It is.

The cavity 23 of the cylindrical movable member 16 has an annular bulge forming a hooking jaw 24. It has a department.

The piston 2 is provided with a projection 25 consisting of three segments 26, 28, 30. It is being Thick segment 26 is larger than the diameter of tubular movable member 16 or They have the same cross section, and the tips thereof are tapered portions 27. middle The segment 28 has a cross section smaller than the diameter of the cavity 23 of the cylindrical movable member 16. and an intermediate segment 28 for engagement within the cavity. 28 has a catch jaw 29 that can engage with the catch jaw 24 of the cylindrical movable member 16. It is provided. The tip segment 30 is smaller than the inner hole diameter of the cylindrical protrusion 20 for instrument mounting. It has a small cross section, and its tip can enter into the inner hole and engage with the cylindrical projection 20. A pair of jaws 31 are provided to form a forked gripping hook.

FIG. 2 shows the syringe according to the invention after injection, with the piston 2 at the tip of the syringe body 1. It has been pushed to the end of its travel facing part 3. In this state, the thick segment of piston 25 The member 26 has a length such that its front end surface contacts the rear end surface of the cylindrical movable member 16. In addition, the base of the segment [26] forms a conical shoulder, and its tape The par-shaped tip 27 is located between the longest non-parallel side 13 and the shorter flat side of the trapezoidal edge 10. After contacting the row side 12, each trapezoidal ridge 10 is bent by bending the flexible tab 9. The bulges 14, which were separated from each other and pressed against the leakage prevention seal 15, are now free from pressure. The pressing is stopped, and as a result, the cylindrical movable member 16 moves away from the stopper J1 of the trapezoidal flange 10. I am free and free. The intermediate segment 28 protruding from the piston is connected to the outer cylinder. A stopper formed at the edge portion 6 of the shaped end piece 4 prevents forward movement. It is fitted into the cavity 23 of the cylindrical movable member 16 which is Due to the length of segment 28, after it operates as a thruster, The assembled structure of the needle attachment cylindrical projection 2o and the cylindrical movable member 16, which were loosely integrated, is now separated, and the intermediate segment is reversely inserted into the cavity 23 of the cylindrical movable member 16. The jaws 24 are aligned in the same direction. The tip segment 30 is a tube for attaching a needle. The jaw 31 at the tip is inserted into the cylindrical projection 16 for needle attachment, and its length is such that the jaw 31 at the tip is inserted into the cylindrical projection 16 It is designed to become a gripping hook that protrudes and engages the tip surface of the.

FIG. 38 shows a syringe of the invention at the beginning of an injection as described in FIG. show.

Figure 3b shows the syringe according to the invention in the wood, with the thick segment protruding from the piston. The tapered portion 27 of the point 26 is approaching the non-parallel side 27, and the trapezoidal edge lO The small parallel sides 12 of are moving away from each other. The intermediate segment 28 is the cylindrical movable member 1 6, but its length is about the same as the cylindrical protrusion 20 for mounting the meter. It reaches the point where it reaches the target and acts as a thruster.

FIG. 30 shows the syringe of the invention at the end of the injection as described in FIG. The thick segment 2 contacts the base of the tip of the syringe body 1 and protrudes from the piston. 26 completely separates both the flexible tab 9 and the trapezoidal protrusion 1.0 to form a cylindrical shape. The movable member 16 is opened so that it can be moved rearward, and the enlarged part 14 for preventing leakage is also sealed. It is far from Le 15. The intermediate segment 28 has a movable cylindrical projection 20 for attaching a needle. [Parts] It has been separated from the assembly consisting of 6, and its jaw 29 has a cylindrical shape. It engages the jaws 24 of the moving member 16. The tip segment 30 is a cylindrical protrusion 2 for mounting a meter. 0, and the jaw 31 at the tip thereof protrudes from the tip of the cylindrical projection 20. .

FIG. 3d shows the syringe according to the invention after injection, in which the user presses the plunger of the piston 2. Pull back 32. Depending on the length of the small parallel side 12 of the trapezoidal edge 10, the trapezoidal edge 10 The relationship between the rear end surface of the cylindrical movable member 16 and the front end surface of the segment 26 protruding from the piston These cylindrical movable members and the piston protrusion 25 are prevented from entering between them. , are intermeshed by the engagement of their respective jaws 29 and 24. Therefore the stand The shaped protrusion a10 has an assembly structure 26-16 formed by a piston protrusion and a cylindrical movable member. It separates when being pulled backwards. of the tip segment 30 of the piston projection. The jaws 31 forming the end are connected to the needle mounting tube already separated in the needle mandrel 19. The protrusion 20 is pulled back, and the outer diameter of this jaw 31 is aligned with the orifice of the outer cylindrical end piece 4. smaller than the inner diameter of the edge portion 6 of the base 5.

Figure 3e shows the syringe of the invention after injection when the piston continues to be pulled backwards. , a series consisting of a piston protrusion, a cylindrical movable member, a cylindrical projection for needle attachment, and a needle. The assembly assembly 25-1.6-20-19 is retracted into the syringe body l.

Figure 3f shows the syringe of the present invention, but the piston is removed after the needle has been completely retracted into the body. The plunger 32 of the needle cap is removed, and the cylindrical end piece 4 is removed from the plunger of the needle cap. It becomes possible to receive the lug 33.

Figure 4 shows each element constituting the syringe of the present invention. piston 2 and Its protrusion 25 consisting of three segments 26.28.30, leakage I top seal 15, and a cylindrical movable member 16 extended by a cylindrical needle attachment projection 20; It consists of a piston plunger 32. The arrows indicate the assembly procedure. The assembly of the moving member and the needle mounting tubular projection is introduced into the syringe body.

FIG. 5 shows an embodiment of a syringe according to the invention, in which the rear part 2 of the movable member 2 is not cylindrical (it is a truncated conical shape, and the large diameter base at the rear is a cylindrical end). It is press-fitted into the inner extension 7 of the piece and in this embodiment can be inflated if desired. Removing the protrusion and leakproof seal, or when they are installed You can check its airtightness.

FIG. 6 shows another embodiment of the invention, in which the needle mounting cylindrical projection 20 is cylindrical and movable. It is integrated with the member 16 and cannot be separated. In this embodiment, the protrusion 2 of the piston 2 5 to only two parts. Thick segment 26 Hana while the middle segment 28 is spaced apart to form its thruster. The jaw 29 that engages with the jaw 24 of the cylindrical movable member 16 loses its role as a piston. Assembly structure 25- consisting of a ring protrusion, a cylindrical movable member, a cylindrical protrusion for attaching a needle, and a needle. It is possible to draw in 16-20-19.

Figures 7a, 7b, 7c, 7d show the present invention using a conventional needle or a needle like that of Figure 6. An example of a syringe according to the present invention is shown. Cylindrical protrusion 20 for needle attachment integrated with movable member 16 The tip portion 33 that enables fixation of the needle mandrel and the crown 35 of the mandrel and an adjacent portion 34 having the same diameter. Flexible tab 9 is a truncated cone shaped, the minor parallel sides of which correspond to their ends terminating in the trapezoidal ridge, and whose shape The shape is almost rectangular (Fig. 7d), and the front hand opening 1 is perpendicular to the tab. 1 forms a stopper. The other 36 at hand is the crown 3 of the needle mandrel. It lies in a plane parallel to the plane of 5. The free end of the trapezoidal flange is the forward portion 37 parallel to the tab. with the rear portion 38 parallel to the needle mandrel (Fig. 7d). against the front This arrangement forming a stop is due to the special shape of the shoulder 26 of the piston projection. will be compensated. This embodiment has a stopper that stops the crown 35 of a conventional needle. This prevents the needle from reappearing (Figure 7c).

Figure 8 shows an injection according to the invention for subcutaneous injection or incielin with a small caliper. It has a built-in needle that is integrated with the movable member, and the tab as shown in Figure 7 can be used as the needle. This prevents the re-appearance of an assembled structure made up of moving parts. This with built-in needle The embodiment allows for the miniaturization necessary for small caliper syringes.

That is, the use of the sanitary syringe according to the invention involves the insertion of a needle into a body that acts as a container. Retraction is possible, thus eliminating the risk of bacterial entry by puncture.

This syringe is easy to manufacture and has a molded syringe body with a cylindrical end piece. molding, as well as molding of pistons with protrusions, is considered practicable. No wonder, its price is also considered similar to traditional syringes. Cylindrical moving part Molding the assembly structure consisting of the material and the cylindrical protrusion for mounting the instrument is difficult. (This only includes a small additional price.)

Widespread adoption of the sanitary syringe according to the invention requires little cost and improves hygiene and puncturing. It makes a considerable contribution to the prevention of diseases caused by bacterial invasion. Ru.

FIG. 3a FIG. 4a FIG.5 S Summary book The syringe has a flexible tab (9) extending inward and terminating in a trapezoidal ridge (101). It has an end piece (4) having a. Nozzle at the end with moderate strength (20) A hollow movable member (16) fitted with can be slid between the tabs. piston (2) has a protrusion consisting of several parts, one of which is a smooth thick segment. The point (26) engages with the trapezoidal ridge (101 and has a segment 128 with jaws (29)). is slidable into the cavity 23. The piston (2) reaches the end of its movement. Then, the segment (28) is separated from the movable member (I6) by pushing the nozzle (20). and inserting the segment (30) with jaws (31) into the bore of the nozzle (20). It is possible. After the injection is performed, the segment (26) leaves the trapezoidal edge 10. The movable member (16) is opened so that it can be moved backwards. Chin f291 (24) and the jaws (31) and the nozzle (20), the movable member-nozzle The assembly structure of the holder 116-20-191 and the gauge are connected to the syringe by the piston. It can be pulled inside.

Copy of amendment vA translation) Submission form (Article 184-8 of the Patent Law) August 26, 1992

Claims (5)

[Claims] 1. The needle can be retracted into the syringe body forming a disposable container after use. This is a sanitary syringe designed to allow the user to The flexible cylindrical end piece 4 terminates in a trapezoidal flange 10 forming a stopper. A longitudinal slot 8 dividing a portion of the cylindrical surface to form a cylindrical tab 9 an inner cylindrical extension 7 terminating in this end piece 4 and its tab 9; The long part 7 has a slightly smaller diameter and is cylindrical ( or partially cylindrical and partially conical) movable member 16 is received, and this hollow movable member 16 supports a needle attachment cylindrical projection 20 at its tip, and the internal cap of the movable member The tee 23 is provided with an annular enlarged portion forming a hooking jaw 24, which allows the piston 2 to The tip protruding extension 25 has at least two parts, namely a thick cross-section part 26 and a thin cross-section part 26. The said part 26 of the protruding part of the piston 2 is formed of a surface part 28 at its end 27. The outer diameter of the movable member 16 is larger than or equal to the outer diameter of the movable member 16. It has a thick cross section, and the length of said part is such that its end reaches the end of the piston's movement. The portions 26 are arranged to abut against the movable member, and each trapezoidal flange of the inner extension 7 10 and tab 9, and when engaged, they are separated to form the trapezoidal shape. The stopper formed by the projecting edge is released, and the movable member 16 is finally pulled rearward. The thin part 28 of the protrusion of the piston 2 is connected to the cavity 23 of the movable member 16. can be engaged and slid within the cavity with a cross-section smaller than the diameter of , the surface of this portion 28 further includes an inverted jaw 29 engageable with the jaw 24 of the movable member 16. and eventually move the movable member and, in some embodiments, adjacent parts rearwardly. A sanitary syringe characterized by being able to be drawn into a sanitary syringe. 2. The outer cylindrical end piece 4 has a cylindrical shape terminated at its distal end by an edge portion 6. orifice 5, the diameter of which is larger than the needle mandrel 19. The syringe according to claim 1. 3. The trapezoidal ridge 10 has a trapezoidal or rectangular cross-sectional shape, and its long base extends inward. A non-woven fabric extending along the tab 9 of the long part 7 and having a relatively large dimension on its short top edge 12. extending to the parallel side 13, the smallest non-parallel side 11 being at right angles to the tab 9, An inner stopper is formed at the tip of the tube 9 to prevent the movable member 16 from moving backward during injection. The movable part is blocked by the opening of said stopper by the shoulder 27 of the piston projection. The rearward movement of the material 16 after injection is canceled, and the trapezoidal edge further takes on a shape similar to a rectangle. The crown of the needle mandrel has small non-parallel sides forming its rear stop. The trapezoidal edge is located in a plane parallel to the plane of the needle and supports the rear part of the needle. Claim characterized in that the large free side has a rear part parallel to the needle mandrel The syringe according to item 1 or 2. 4. A cylindrical (or conical) surface of the movable member is attached to the inner surface of each side of the flexible tab 9. It has an enlarged portion 14 that corresponds to the flexible seal located at the top to ensure complete leakage prevention. The syringe according to any one of claims 1, 2 and 3, characterized in that: 5. The assembly structure consisting of the movable member 16 and the cylindrical protrusion 20 for mounting the meter is designed to prevent leakage. The segments 28 of the piston projection are weakly connected to each other at the diameter of the movable member 16 It has a smaller cross section and the tip is measured before the piston reaches the end of its travel. It has a length such that it comes into contact with the mounting cylindrical projection 20, and the segment functions as a thruster. from the movable member 16 and the needle attachment cylindrical projection 20, which are weakly connected to each other by acting as The assembled structure is separated and disassembled, and this segment 28 is attached to the piston protrusion 25 as the third segment. The cross-section of this segment 30 is is larger than the diameter of the inner hole of the instrument mounting cylindrical projection 20 with which it can be engaged and slid. The segment 30 is small and has a hooking jaw 31 at its tip forming a grasping hook, The jaw 31 pulls the needle mandrel 19 and the locked needle attachment cylindrical projection 20 backward. Claim 1, 2, 3, or 4, characterized in that: syringe.