WO1991012841A1 - Syringe with retractable needle - Google Patents
Syringe with retractable needle Download PDFInfo
- Publication number
- WO1991012841A1 WO1991012841A1 PCT/FR1991/000154 FR9100154W WO9112841A1 WO 1991012841 A1 WO1991012841 A1 WO 1991012841A1 FR 9100154 W FR9100154 W FR 9100154W WO 9112841 A1 WO9112841 A1 WO 9112841A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylindrical
- extension
- piston
- syringe
- movable element
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
Definitions
- the invention relates to a syringe.
- a conventional syringe has a cylindrical body in which a piston slides and the base of which carries an adjustment on which the mandrel of a needle fits.
- the syringe and needle should in principle be discarded - after single use; however, they may be re-used and spread diseases (AIDS, viral hepatitis B).
- Injection equipment has therefore been designed to be unusable after single use: the syringe is provided with a cylindrical tip orolonqé by the adjustment, the assembly seems to be weakly secured . , while the piston has a projection which forms a pusher detaching the adjustment of the endpiece and blocking it in the mandrel of the needle during ⁇ ⁇ 'injection,!' gear of barbs on the adjustment and in the cavity of the mandrel makes the needle unusable.
- This needle made unusable can however transmit diseases by injection after injection, either accidentally (manipulations by nursing staff or cleaning worker) or accidentally (injection on beaches and public places).
- the object of the present invention is to remedy this drawback and to this end provides a syringe designed in such a way that the needle made unusable after use can enter the coros of the syringe forming a disposable container after use.
- The. syringe body is provided at its base with an external cylindrical tip.
- this nozzle is limited at its end by a rim defining a cylindrical opening whose internal diameter is slightly greater than the external diameter of the mandrel of the needle.
- This rim is intended to serve as a stop.
- the external cylindrical end piece has an internal cylindrical extension which also has longitudinal slots arranged along the lines of the generators. These slots separate portions of cylindrical surface which form flexible tongues in variable number and equal to that of the slots which delimit them and terminated by lugs.
- the lugs are characteristic, the longitudinal section of a lug affects the shape of a rectangular trapezoid whose large external base extends the corresponding tongue and the small internal base which must be of sufficient size is extended by the non-parallel side the greatest. The smaller non-parallel side forms a right angle with the tongue and is intended to serve as a stop.
- the junction zone of the cylindrical extension and the flexible tongues may have a slight relief intended to ensure sealing with the cylindrical movable element.
- the external cylindrical end piece and its internal extension receive a hollow cylindrical movable element, the part of which distends relative to the base of the syringe supports the cylindrical proximal end of the fitting with which it forms a tight but weakly integral assembly.
- the actual cylindrical movable element consists of two parts:
- the distal part which responds to the opening of the external cylindrical tip of the syringe: its external diameter is slightly greater than the external diameter of the mandrel of the needle, its internal diameter defines a cylindrical cavity the diameter of which is itself slightly greater than the section of the cylindrical part of the adjustment.
- the proximal part forming the body of the cylindrical mobile element its external diameter is slightly less than the internal diameter of the cylindrical end piece in which it is capable of sliding, but slightly greater than the diameter of the delimiting rim the opening of the external cylindrical tip of the syringe which therefore forms a stop preventing the displacement of the mobile cylindrical element in the posterior anterior direction.
- the cylindrical extension with which the piston is provided at its end corresponding to the base of the syringe is composed of several parts:
- the extension segment adjoining the piston has an upper section or equal to the external diameter of the cylindrical mobile element, and a length such that its end aff ⁇ ries the proximal base of the mobile element cylindrical when the syringe plunger is pushed to the end of its travel.
- This segment forms a shoulder, the end of which is faired in such a way that the fairing and the cylindrical surface of this segment of the extension of the piston are capable of coming into contact with the large free base and the smallest of the parallel sides of the front pins.
- the median segment of the extension of the piston has a section slightly smaller than the diameter of the cavity of the cylindrical movable element so as to be able to engage and slide therein; this segment has a length such that its end abuts against the proximal end of the adjustment before the syringe piston is at the end of its travel.
- the median segment When the syringe plunger is pushed to the end of its travel, the median segment forms a plunger and separates the adjustment of the movable element blocked forwards by the stop formed by the rim of the end of the external endpiece.
- This median segment carries circular reliefs forming barbs intended to mesh with those arranged in opposite direction which is provided with the cavity of the cylindrical movable element, and to allow the traction of that when it is released by the spacing lugs and that the piston is pulled back.
- the median segment is finally rib longitudinally so as to allow the flow of residual liquid when the piston reaches the end of the stroke.
- the distal segment of the extension of the piston has a cross section slightly less than the diameter of the adjustment duct so as to be able to engage and slide therein, and a length slightly greater than the latter.
- This distal segment is provided at its end with barbs forming like the branches of a grapple intended to pull the needle back after the injection when the piston is pulled.
- the distal segment is longitudinally ribbed to allow the flow of the drop residual at the end of injection.
- the plunger may have a thread on its face corresponding to the • plunger arm making it possible to unscrew the latter after use, as exists on vaccine syringes.
- the protective cap of the needle can be delivered with a stopper provided so as to adapt to the end of the cylindrical end of the syringe and prevent the exit of the retracted needle into the body of the syringe forming housing.
- syringes with low capacity such as insulin syringe or Intra-dermo syringe
- syringes with low capacity such as insulin syringe or Intra-dermo syringe
- syringes with low capacity such as insulin syringe or Intra-dermo syringe
- FIG. 1 is a schematic axial sectional view of the syringe according to the invention with a partial enlargement of the end of the syringe and a front section along ⁇ ' - Figure 2 is the schematic view in axial section, the partial enlargement of the end and the fron ⁇ tale section along AA 'of the same syringe as in Figure 1, at the end of injection.
- - Figure 3 is a schematic axial sectional view of the syringe at the various stages of injection 3a start of injection, 3b during injection, 3c end of injection, 3d, 3e, 3f syringe after injection.
- FIG. 4 is a schematic axial sectional view of the elements constituting a syringe according to the invention.
- Figure 1 shows a syringe according to the invention empty or at the start of an injection: the piston 2 slides in the body 1 of the syringe which carries at its base 3 an external cylindrical tip 4 whose opening 5 is limited by a rim 6, this external cylindrical end piece 4 has an internal extension 7 divided by slots 3 in flexible tabs 9 terminated by lugs 10 in the shape of a rectangular trapezoid, the smallest non-parallel side 1 of which forms a stop, and the , small base 12 is suffi ⁇ ciently long and is extended by the larger non-parallel side 13.
- the internal face of the root of the flexible tongues 9 has a relief 14 intended to ensure the seal with the seal 15 supported by the 'mobile cylindrical element 16, the distal part 17 of which has an external diameter 18 slightly greater than the external diameter of the needle mandrel 1 "and an internal diameter slightly greater than that of the cylindrical part of the adjustment 20 which extends it.
- the proximal part 22 of the cylindrical movable element 16 has a diameter slightly less than that of the cylindrical end piece 4-7 in which it slides, this diameter is however greater than that of the rim 6, which forms a stop immobilizing towards the before the cylindrical movable element 16 which is moreover immobilized towards the rear by the pins 10.
- the cavity 23 of the cylindrical movable element 16 is provided with circular reliefs forming barbs 24.
- the piston 2 is provided with an extension 25 in three parts 26, 28, 30.
- the wide segment 26 has a upper section or equal to the diameter of the cylindrical movable element 16, its end carries a fairing 27.
- the median segment 28 has a cross section smaller than the diameter of the cavity 23 of the cylindrical movable element 16 in which it is likely to engage , it is provided with barbs 29 which are likely to mesh with the barbs 24 of the cylindrical movable element 16.
- the distal segment 30 has a cross section smaller than the diameter of the fitting duct 20 in which it is likely to s 'engage, it is provided at its end with barbs 3i whose braches form a grap ⁇ pin.
- FIG. 2 represents a syringe according to the invention at the end of injection: the piston 2 is pushed at the end of its travel against the base 3 of the syringe body 1.
- the wide segment 26 of the extension of the piston 25 has a length such that its end is flush with the base of the cylindrical movable element 16, it forms a shoulder, the faired end of which 27 after being in contact with the sides not the largest 13 and the small bases 12 parallel the lugs 10 have separated them by flexing flexible lan ⁇ guettes 9 whose reliefs 14 which throttled the seals 15 have released their grip; thus the cylindrical movable element 16 is released from the stop 11 of the lug 10.
- the distal segment 30 has slid in the adjustment duct 16, its length is such that the barbs 31 form a terminal grapple deployed at the end of the fitting 16.
- Figure 3a shows the syringe according to the invention at the start of injection as described in Figure 1.
- Figure 3b shows the syringe according to the invention during injection: the fairing 27 of the wide segment 26 of the extension of the piston approaching the larger non-parallel side 13 and the small base 12 of the pins 10 which gradually move away.
- the middle segment 28 slides in the cavity 23 of the cylindrical movable element 16 and has an ion gueur as it abuts against the adjustment 20 and makes pous ⁇ evening.
- FIG. 3c represents the syringe according to the invention at the end of injection as described in FIG. 2: the plunger 2 touches the base 3 of the body of the syringe 1, the wide segment 26 of the extension of the plunger deviates completely flexible tongues 9 and lugs 10 releasing the cylindrical movable element 16 towards the rear, the * reli ⁇ sealing efs i4 collide with the seals 15.
- the middle segment 28 has separated the adjustment assembly — cylindrical mo ⁇ bile element 20-16 , its barbs 29 are meshed with the barbs 24 of the cylindrical mobile element 16.
- the distal segment 30 has slid in the duct of the nozzle 20, its terminal barbs 31 are deployed at the end of the adjustment.
- Figure 3d shows the syringe according to the invention after the injection: the user pulls back the arm 32 of the piston 2, the importance of the length of the small base 12 of the lug 10 prevents that -ci to be inserted between the end of the wide segment 26 of the piston extension of the cylindrical movable element i6 secured to each other by the gear of their respective barbs 29 and 24. the lugs iO therefore remain separated when the assembly extension of the piston-cylindrical movable member 26-16 is pulled back.
- the barbs 31 which terminate the distal segment 30 of the extension of the piston pull back the snap 20 broken in the mandrel 19 of the needle whose external diameter is less than that of the rim 6 of the opening 5 of the external cylindrical end piece 4.
- 3e represents the syringe according to the invention after the injection when the user continues to pull the piston back: the extension assembly of the piston-cylindrical movable element-adjustment-needle 25-16-20-19 fits into the body of the syringe 1.
- FIG. 3f shows the syringe according to the invention: the needle completely retracted into the body 1 of the syringe, the arm of the piston 32 is unscrewed; the external cylindrical endpiece 4 can receive the plug 33 of the needle cap.
- FIG. 4 represents the various constituent elements of the syringe according to the invention: body of ring 1, piston 2 and its extension 25 in three parts 26, 28, 30 cylindrical movable element 16 with its seal 15 and extended by the adjustment 20, pis ⁇ ton arm 32.
- the arrow indicates the mounting method: the cylindrical movable element-adjustment assembly is put in place by the body of the syringe.
- FIG. 5 shows an embodiment of a syringe according to the invention in which the proximal part 22 of the movable element is not cylindrical, but in a truncated cone with a large posterior base embedded in force in the internal extension 7 of the cylinder, this embodiment may optionally allow deletion relief and seal, or perfect thereof if they are maintained.
- FIG. 6 represents another embodiment of a syringe according to the invention where the adjustment 20 is integral and inseparable from the cylindrical movable element 16, this embodiment makes it possible to reduce the extension 25 of the piston 2 to only two parts.
- the wide segment 26 always forms a shoulder while the segment 27 becomes distal and loses its role as a pusher, its barbs 29 intended to mesh with the barbs 24 of the cylindrical mobile element 16, allow the traction of the assembly extension of the piston-moving element cyiindrique-adjustment-aiguiiie 25-16-20-19, this assembly is entirely retrac ⁇ table in the body of the syringe.
- the adjusage 20 secured to the movable element i6 comprises a distilled part 33 which allows adaptation to the mandrel of the needle, and a proximal part 34 of the same diameter as the crown 35 of the mandrel.
- the flexible tongues 9 form a truncated cone whose small base responds to their extremi ⁇ tees terminated by lugs the shape of which is close to that of a rectangle (FIG. 7d): the small anterior side li at right angles to the tongue stop form.
- the other side pe ⁇ tit 36 is in a plane parallel to the plane of the crown 35 of the mandrel of the needle.
- the free edge of the lug has a front part 37 parallel to the tongue and a rear part 38 parallel to the mandrel of the needle, (fig 7d).
- This arrangement forms a stop in the postero-anterior direction is compensated by a streamlined shape accen ⁇ killed by the shoulder 26 of the extension of the piston.
- This embodiment makes it possible to have a stop retaining the crown 35 of a conventional needle preventing the needle from coming out again. shooting (Tigure / c)
- FIG. 8 represents a syringe according to the invention of small gauge (uitra-dermo or insulin), with "needle mounted” secured to the movable element; the tabs as 5 in FIG. 7 prevent the needle-movable assembly from coming out.
- This embodiment with needle mounted per ⁇ puts miniaturization essential for small caliber syringes.
- a hygienic syringe according to -, C to the invention allows the retraction of the needle in the body of the syringe forming a housing, any risk of pi ⁇ septic qûre is ruled out.
- the molding of the syringe body with a cylindrical esehout, like that of the plunger with an extension, is of similar feasibility and cost as that of a conventional syringe.
- the moulaq ⁇ of the cylindrical-fitting mobile assembly does not add any difficulty and can only bring a small additional cost.
- the widespread adoption of hygienic injection equipment according to the invention would make a considerable contribution to hygiene and to the prevention of diseases transmitted by septic injection at low cost.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR90/02325 | 1990-02-26 | ||
FR9002325A FR2658724B1 (en) | 1990-02-26 | 1990-02-26 | HYGIENIC SYRINGE WITH A RETRACTABLE NEEDLE IN THE SYRINGE BODY AFTER USE. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991012841A1 true WO1991012841A1 (en) | 1991-09-05 |
Family
ID=9394111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1991/000154 WO1991012841A1 (en) | 1990-02-26 | 1991-02-25 | Syringe with retractable needle |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0516761A1 (en) |
JP (1) | JPH05503649A (en) |
AU (1) | AU7551491A (en) |
CA (1) | CA2076864A1 (en) |
FR (1) | FR2658724B1 (en) |
WO (1) | WO1991012841A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993023100A1 (en) * | 1992-05-15 | 1993-11-25 | Thomas Lenz | Disposable injection syringe |
US5370619A (en) * | 1989-12-20 | 1994-12-06 | Rossi; Lucio | Single-use safety syringe provided with retractile needle and device preventing it from being reused |
EP0661067A1 (en) * | 1993-12-16 | 1995-07-05 | Long-Hsiung Chen | Simplified safety syringe with retractable self-biased needle |
EP0681487A1 (en) * | 1993-02-01 | 1995-11-15 | Innova Development Corporation | Hypodermic syringe with needle retraction feature |
WO2020264057A1 (en) * | 2019-06-27 | 2020-12-30 | Sharps Technology, Inc. | Ultra-low waste disposable safety syringe for low dose injections |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2142735B1 (en) * | 1997-11-14 | 2000-12-01 | Sanchez Manuel Valle | PERFECTED SYRINGE WITH BUILT-IN LOCKING SYSTEM CALLED FOR SINGLE USE OR NOT REUSABLE. |
NL1020937C2 (en) * | 2002-06-25 | 2003-12-30 | Medical Patents Ltd | Injection syringe having retractable injection needle for medical applications, has liquid holder with outlet opening, plunger having plunger head, injection needle with needle amount mounted on outlet opening of holder |
WO2004000398A1 (en) | 2002-06-25 | 2003-12-31 | Medical Patents Limited | Injection syringe having a retractable injection needle |
SE0301667D0 (en) * | 2003-06-04 | 2003-06-04 | Medsafe Asa | Disposable injection syringes |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0321903A2 (en) * | 1987-12-21 | 1989-06-28 | Stuart M. Dolgin | Fluid passing apparatus with means for covering the same |
EP0347742A1 (en) * | 1988-06-23 | 1989-12-27 | Aldo Venturini | Disposable safety syringe |
-
1990
- 1990-02-26 FR FR9002325A patent/FR2658724B1/en not_active Expired - Lifetime
-
1991
- 1991-02-25 CA CA 2076864 patent/CA2076864A1/en not_active Abandoned
- 1991-02-25 EP EP19910906646 patent/EP0516761A1/en not_active Ceased
- 1991-02-25 AU AU75514/91A patent/AU7551491A/en not_active Abandoned
- 1991-02-25 JP JP50691991A patent/JPH05503649A/en active Pending
- 1991-02-25 WO PCT/FR1991/000154 patent/WO1991012841A1/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0321903A2 (en) * | 1987-12-21 | 1989-06-28 | Stuart M. Dolgin | Fluid passing apparatus with means for covering the same |
EP0347742A1 (en) * | 1988-06-23 | 1989-12-27 | Aldo Venturini | Disposable safety syringe |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5370619A (en) * | 1989-12-20 | 1994-12-06 | Rossi; Lucio | Single-use safety syringe provided with retractile needle and device preventing it from being reused |
WO1993023100A1 (en) * | 1992-05-15 | 1993-11-25 | Thomas Lenz | Disposable injection syringe |
US5527285A (en) * | 1992-05-15 | 1996-06-18 | Funova Ab | Disposable injection syringe |
EP0681487A1 (en) * | 1993-02-01 | 1995-11-15 | Innova Development Corporation | Hypodermic syringe with needle retraction feature |
EP0681487A4 (en) * | 1993-02-01 | 1997-05-21 | Innova Dev Corp | Hypodermic syringe with needle retraction feature. |
EP0661067A1 (en) * | 1993-12-16 | 1995-07-05 | Long-Hsiung Chen | Simplified safety syringe with retractable self-biased needle |
WO2020264057A1 (en) * | 2019-06-27 | 2020-12-30 | Sharps Technology, Inc. | Ultra-low waste disposable safety syringe for low dose injections |
US11497860B2 (en) | 2019-06-27 | 2022-11-15 | Sharps Technology, Inc. | Ultra-low waste disposable safety syringe for low dose injections |
Also Published As
Publication number | Publication date |
---|---|
AU7551491A (en) | 1991-09-18 |
FR2658724A1 (en) | 1991-08-30 |
FR2658724B1 (en) | 1992-08-28 |
EP0516761A1 (en) | 1992-12-09 |
JPH05503649A (en) | 1993-06-17 |
CA2076864A1 (en) | 1991-08-27 |
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