WO2014080420A2 - Vacuum-retractable safety (vrs) syringe for single use - Google Patents

Vacuum-retractable safety (vrs) syringe for single use Download PDF

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Publication number
WO2014080420A2
WO2014080420A2 PCT/IN2013/000657 IN2013000657W WO2014080420A2 WO 2014080420 A2 WO2014080420 A2 WO 2014080420A2 IN 2013000657 W IN2013000657 W IN 2013000657W WO 2014080420 A2 WO2014080420 A2 WO 2014080420A2
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
plunger
conical
needle
proximal end
Prior art date
Application number
PCT/IN2013/000657
Other languages
French (fr)
Other versions
WO2014080420A3 (en
Inventor
Jai Hind RATHORE
Bharati RATHORE
Pratibha RATHORE
Neelam RATHORE
Bhuvan Chandra RATHORE
Original Assignee
Rathore Jai Hind
Rathore Bharati
Rathore Pratibha
Rathore Neelam
Rathore Bhuvan Chandra
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rathore Jai Hind, Rathore Bharati, Rathore Pratibha, Rathore Neelam, Rathore Bhuvan Chandra filed Critical Rathore Jai Hind
Publication of WO2014080420A2 publication Critical patent/WO2014080420A2/en
Publication of WO2014080420A3 publication Critical patent/WO2014080420A3/en

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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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • 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
    • A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • 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
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • A61M2005/3241—Needle retraction energy is accumulated inside of a hollow plunger rod
    • A61M2005/3242—Needle retraction by vacuum

Definitions

  • the present invention Vacuum-retractable Safety Syringe 1 00 for Single use relates to a safety syringe having an auto retractable needle for use in the medical or dental profession or in personal drug administration so that the physicians, surgeons or other needle operators may be protected from the needle-stick injury during its use.
  • the invention in particular, relates to an assembly of the safety syringe which is simple and easy in handling, in which the hypodermic needle retracts itself automatically by virtue of self generated vacuum and encapsulate within the barrel as soon as the last drop is injected in the body of patient. The syringe thereafter becomes finally locked -to become non-reusable.
  • the handling of syringe does not require any special training to the operators. It is simple in manufacture.
  • syringes are simple axial piston pumps with a plunger that fits tightly in a cylindrical barrel. The plunger can be pulled and pushed along inside the barrel, thereby creating a pressure gradient. Additionally, many syringes carry a sharp and penetrating hollow needle that is intended to puncture the skin, mucous membrane and internal organs of humans or animals for injection or removal of fluids, aerosols, or particulate suspensions.
  • the plunger of the syringe needs a hard push beyond the normal pressure. Therefore, if the needle of the syringe is drawn from the patient before the auto retraction is activated then it matters little how v iolent the initial kick-back is, On the other hand, if the auto retraction of the needle in the syringe is activated whilst the needle is in the body of the patient, either accidentally or deliberately, it may be quite uncomfortable or cause undesirable damage to the tissues in which the needle is inserted. There is another kind of syringe in which the needle is retracted into the barrel under the action of spring after injection.
  • the needle is retracted too fast which may result in bursting out of blood under the body pressure from the punctured hole on the body, which further brings secondary cross infections.
  • the conventional syringes also lack in full-proof locking arrangement as well as effective retraction mechanism to prevent and restrict further use of syringes once used.
  • An object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with an inner plunger barrel 108. an outer plunger barrel 112, an outermost barrel 102, and a needle carrier assembly 104 holding a hypodermic needle 140 along- with a need le cover 142.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for S ingle use with a uniformly hollovv cylindrical tubular outer plunger barrel, provided with a thumb rest 164 at its distal end D and a piston seal holder at proximal end P for holding a first piston seal 170.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a uniformly hol low cylindrical tubular outer plunger ' barrel comprising diametrically as well as oppositely positioned two longitudinal slots 172 and 173 to provide sliding passage to the outwardly protruded conical notches 143 and 144 of inner plunger barrel 108.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use an inner plunger barrel 108 to create vacuum between the inner plunger barrel and the outer plunger barrel.
  • Another object of the present subject matter is to provide the outer plunger barrel 112 with outwardly protruded finger lock 166 at distal end to lock the outer plunger barrel 112 within the outermost barrel 102 by conveniently seating inside the inner circumferential conical groove 120 of the outermost barrel 102 after completion of the injection process.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a uniformly hollow cylindrical tubular inner plunger barrel 108 comprising diametrically as well as oppositely positioned two finger locks 143 and 144 opening at distal end, wherein, each of the finger lock is provided with an outwardly protruded conical notch, having proximal surface perpendicular to the outer surface of the inner plunger barrel, whereas the distal surface of notch is obl iquely inclined to the distal end.
  • Another object of the present subject matter is to provide the inner plunger barrel a piston seal holder 148, holding the piston seal 150 to create vacuum between the inner as well as outer plunger barrels during the injection process.
  • Another object of the present subject matter is to provide the Vacuum-retractable K Safety Syringe for Single use with a un iform ly hollow cylindrical tubular outermost barrel 102 comprising a finger rest 128 at the d istal end and further comprising a conical jacket 126 » ⁇ at proximal end to hold the needle carrier assembly 104.
  • Another object of the present subject matter is to provide the outermost barrel 1 02 with two sets of face to face positioned, uniform, inner circumferential conical C-grooves 120 and 122, positioned at some distance from each other at the distal end D of the outer most barrel 102, both set of grooves 120 and 122 being perpendicularly separated by diametrically opposite longitudinal grooves (X and Y), opening at distal end.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with an O-ring 136 to hold the needle carrier assembly 1 04 within the outermost barrel 126 and dislodge the needle carrier assembly after the completion of injection process.
  • Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a plunger plug 110 comprising a centrally positioned furrowed nipple 154 at proximal surface, the nipple having the locking means 156 to snap lock with the locking member 132, provided in the cavity 1 30 of needle carrier assembly 104.
  • Another object of the present subject matter is to provide the plunger plug 104 with the groove 154 to hold the gasket seal 160, so that the plug 110 is held air-tightly within the collar 168 provided at the inner side of the proximal end of outer plunger barrel 112.
  • the subject matter described herein generally relates to a safety syringe having an auto-retractable needle for use in medical or dental profession or in personal drug administration, so that the physicians, surgeons or other needle operators may be protected from needle-stick injuries after its use. Therefore, the invention, in particular, relates to an assembly of the safety syringe which facilitates simple operation and easy handling, in which the hypoderm ic needle automatical ly retracts itself by virtue of self generated vacuum during operation process and automatically encapsulates within the barrel, as soon as the last drop of medicine is injected in the body of patient. The syringe, thereafter, automatically locks itself to become non-reusable. It describes a simple technique which is easy in manufacture and does not requ ire any special training to the operators for handling
  • Fig 1 illustrates a line diagram of an outer plunger barrel of Vacuum-retractable Safety Syringe for Single use.
  • Fig 2 i l lustrates line diagrams of need le carrier assembly of Vacuum-retractable Safety Syringe for Single use.
  • Fig 3 illustrates line diagrams of needle carrier assembly housed inside the outer barrel of Vacuum-retractable Syringe for Single use.
  • Fig 4(a) il lustrates a l ine diagram of an inner plunger barrel of the Vacuum- retractable Safety Syringe for Single use.
  • Fig 4(b) illustrates a line diagram of plunger plug of the Vacuum-retractable Safety Syringe for Single use.
  • Fig 4(c) illustrates line diagrams of outer plunger ban-el of the Vacuum-retractable Safety Syringe for Single use.
  • Fig 5 il lustrates a line diagram of complete plunger assembly of the Vacuum- retractable Safety Syringe for Single use. .
  • Fig 6 illustrates a line diagram of the complete assembly of the Vacuum-retractable Safety Syringe for Single use.
  • Fig 7, 8 and 9 il lustrate line diagrams of various functional stages during injection process of the Vacuum-retractable Safety Syringe for Single use.
  • Fig 10 illustrates a line diagram of completely locked Vacuum-retractable Safety Syringe for Single use with retracted needle, encapsulated, in plunger barrel.
  • the safety syringe includes a syringe barrel and a plunger slidably located therein.
  • the plunger is designed with a proximal and a distal end with piston means associated therewith at its distal end so as to be sealingly slidable within the barrel.
  • the of the Vacuum-retractable Safety Syringe for Single use (VRS) 100 is structural ly constructed with an outer plunger barrel 112, inner plunger barrel 108, a plunger plug 110, an outermost barrel 102 and a needle carrier assembly 104 holding a hypodermic needle 140 along with a needle cover 142.
  • the outer plunger barrel 112 as shown in Fig.
  • 4(c) comprises of a uniformly elongated cylindrical U-shaped hollow tubular body opening outs ide at proximal end P, provided with a thumb rest 162 and outwardly protruded finger lock 166 at distal end, two diametrically opposite longitud inal slots 172 & 173 in middle portion and a first piston seal 170 at the outer surface of the proxi mal end of the plunger barrel 112.
  • the inner diameter of the outer plunger barrel 112 at the proximal end is equal to the outer diameter of the inner plunger barrel 108, which slightly increases to constitute a collar 168 at the inner surface of proximal end of the outer plunger barrel.
  • the inner diameter and the width of collar 1 68 are eq ual to the outer diameter and thickness of the plunger plug 110 respectively.
  • the inner diameter of the collar 168 is provided with a conical groove 169 to hold the plunger plug 110 with the help of gasket seal ring 160 packed between the collar 168 and the outer circumferential surface of the plunger plug 110.
  • the outer plunger barrel 112 is provided with diametrically opposite face to face positioned two uniform longitudinal slots 172 & 173 in the midd le portion of outer plunger barrel 112 to constitute passage for axial movement of the conical notches 145 and 146, provided at the proximal ends of the finger locks 143 and 144.
  • the inner plunger barrel 1 08 as shown in Fig. 4(a), comprises of a uniformly elongated hollow cylindrical tubu lar body, provided with a seal holder 148 at the proximal end to hold a second piston seal 150.
  • the inner plunger barrel 108 is further provided with oppositely positioned two finger locks 143 and 144 opening at distal end.
  • the distal ends of the finger locks are provided with outwardly protruded conical notches 145 and 146.
  • the proximal end of each of the conical notch is perpendicular to the outer surface of the barrel 108, whereas the distal end is obliquely inclined to the distal end of the barrel 108.
  • the outer diameter of the inner plunger barrel is equal to the inner diameter of collar 168 of the outer plunger barrel 112.
  • FIG. 4(b) il lustrates the plunger plug 110, wherein the outer diameter and thickness of the plunger plug 110 is respectively equal to the inner diameter and width of the collar 168, provided at the proximal end of the outer plunger barrel 112.
  • the plunger pl ug is provided with a uniform outer circumferential groove 152 in alignment with the groove 169 provided at the inner surface of the collar 168, to hold the plug firmly inside the proximal end of the outer plunger barrel 112 with the help of gasket seal ring 160 sandwiched between the respective circular grooves 169 and 152 of inner plunger barrel 108 and the plunger plug 110.
  • the plunger plug 110 is central ly designed with a longitudinally furrowed knob 154 at its proximal surface, having its outer diameter equal to the inner surface of the cavity 130 of needle carrier 104.
  • the furrowed knob 154 is advantageously provided with a lock element 156 at proximal end.
  • the lock element 156 snap locks within the needle carrier cavity with the lock element 132, provided at the proximal end of the cavity 130.
  • inner plunger barrel 110 is inserted into the outer plunger barrel 112 through its proximal open end keeping the conical notches 145 & 146 of finger locks 143 and 144 in alignment of the longitudinal slots 172 and 173 in such a manner so that the outwardly protruding notches protrude out passing through the longitudinal passage of slots 172 and 173.
  • the notches press the finger locks 143 and 144 in inward direction ' and on push ing the inner plunger barrel 110 further into the outer plunger barrel 1 12, it conveniently inserts into the outer plunger barrel.
  • the notches 145 & 146 of the finger locks 143 & 144 protrude out passing through the longitudinal slots 172 and 173, as shown in Fig. 5.
  • the plug 110 After inserting the inner plunger barrel 108 into the outer plunger barrel 112, the plug 110 is fitted inside the proximal end of the outer plunger barrel.
  • the elastic gasket ring 160 is fitted within the circumferential conical groove 152 of the plunger plug 110 and the plunger plug is inserted through its distal end into the outer plunger barrel 112 through its open proximal end in such a manner that the gasket ring is sandwiched and packed between the two inner as well as outer circumferential grooves 169 and 152 provided at the inner surface of collar 168 of the outer plunger barrel and the outer surface of plunger plug 110 respectively.
  • the plunger plug 110 is air-tightly held inside the proximal end of the outer plunger barrel 112 to constitute a complete plunger assembly 114, as shown in Fig. 5.
  • the outer most barrel 102 as shown in Fig. 1, comprises a uniformly elongated hollow cylindrical tubular body, provided with a finger rest 128 and two sets of face to face positioned, un iform, inner circumferential C-grooves 120 and 122, positioned at some distance from each other at the distal end D of the outer most barrel 102.
  • the first set of conical groove 120 is obliquely and slidably inclined towards the proximal end of the outer W most barrel 102, whereas the distal end of conical groove is perpendicular to the inner surface of the outermost barrel 102.
  • the second set of conical groove 122 is obliquely and slidably inclined towards the distal end of the outer most barrel 102, whereas the proximal end of conical groove is perpendicular to the inner surface of the outermost barrel 102.
  • the both set of grooves 120 and 122 are perpendicularly separated by diametrically opposite longitudinal grooves (X and Y), opening at distal end as shown in Fig. 1(b).
  • the outer most barrel 102 is customized into a conical jacket 126, opening at the proximal end of the outer most barrel 102 in an embod iment of the present subject matter.
  • the inner diameter of the outermost barrel 102 is equal to the outer diameter of the outer plunger barrel 112 throughout its length but it slightly increases at the proximal portion of the outermost barrel to constitute a tiny collar 124 to hold the needle carrier assembly.
  • the vacuum-retractable Safety Syringe 100 also includes a conical needle carrier assembly 104, as shown in Fig. 2, comprising of a hol low conical need le carrier 139, provided with a longitudinal ax ial passage at its centre which is parallel to the outermost barrel 102, in an em bod iment of the present subject matter.
  • the axial passage widens at distal end to constitute a cavity 130, which provides a seat and internal , locking arrangement 132 to capture the knob 154 provided in the plunger plug 110; as explained earlier.
  • the inner diameter of cavity 130 is equal to the outer diameter of the knob 154.
  • the proximal end of the axial passage opens outside at proximal end through a straight hollow hypodermic needle 140.
  • the distal portion of needle carrier 104 is designed parallel to the inner surface of the outermost barrel 102.
  • the conical needle carrier 104 is designed with a collar 138 at distal end of its outer surface. Further, this conical proximal end extends in a removable hollow straight needle 140 attachable at proximal end, in an embodiment of the present subject matter.
  • the hollow needle 140 is advantageously encapsulated in a removable needle cover 142.
  • the conical needle carrier 104 is also structured with an elastic O-ring 136 having inner diameter and thickness equal to the outer diameter and thickness of distal portion of conical needle carrier 104.
  • the outer diameter of O-ring 136 is equal to the slightly enlarged inner proximal d iameter of the outer barrel 102.
  • the outer proximal circumferential edge of O-ring 132 is round in shape.
  • the proximal end of needle carrier 104 is first inserted in the outermost barrel 102 along with O-ring 136 through its distal end, keeping the needle 140 directing to proximal end of the barrel 102.
  • the needle assembly easily slides inside the outermost barrel 102.
  • the needle carrier assembly seats conveniently inside the outermost barrel within the inner proximal potion provided with slightly enlarged diameter at its proximal end and the needle 140 along with needle cover 142 protrudes out through the proximal opening of outermost barrel 102, as shown in Fig. 3, to constitute complete outermost barrel assembly 106.
  • the proximal end of the complete plunger assembly 114 holding inner plunger barrel 108 and plunger plug 110, as shown in Fig. 5, is inserted into the outermost barrel containing the needle carrier assemblyl06, as shown in Fig. 3, through its distal end in such a manner, so that the conical notches 145 & 146 protruding out through the longitudinal slots 172 & 173 in complete plunger assembly 114 become in alignment of the longitudinal groove X & Y, provided at the distal end of outer plunger barrel 112.
  • the plunger assembly 114 On pressing the complete plunger assembly 114 further into the outermost barrel in forward direction, the notches X & Y slide axially into the outermost barrel because the finger locks 143 & 144 are pressed in inward direction while passing over the slops at the proximal end of the longitudinal grooves X & Y. After inserting the plunger assembly into the outermost barrel, the plunger assembly is rotated in either direction approximately at 80- 120° angle to misalign the notches 145 & 146 from the longitudinal grooves X & Y.
  • the user While working with the syringe 100, as shown in Fig. 6, the user has to remove the needle cover 142 to expose the needle 140.
  • the plunger assembly 114 is pulled in backward direction until the notches 145 & 146 become in alignment of circumferential groove 122 of the outermost barrel 102 and get engage therein the conical groove 122, as shown in Fig. 7.
  • Figs 7 to 9 illustrate other embodiments of the present subject matter which show how the medicinal dose may be injected into the body of the patient.
  • plunger assembly 114 While injecting the medicinal dose into the body of patient, the continuous movement of plunger assembly 114 in forward direction simultaneously initiates and executes the following actions at the final stage of completion of injection: Firstly, the furrowed nipple 154 inserts into the cavity 130 of needle carrier assembly 104 through its distal end and gets snap locked therein with the help of locking members 156 and 132 respectively. Thus the needle carrier along with hypodermic needle locks with the plunger plugs 110 at its proximal end.
  • the proximal end of the plunger assembly 114 pushes the O-ring 134 in forward direction, which results the plunger plug 110 to dislodge from the collar 168 of the plunger barrel 112, as shown in Fig. 9. Consequently, the dislodged plunger plug holding needle along with the needle carrier gently as well as smoothly retracts in backward direction due to the pull of vacuum between the plunger plug 110 and the second piston seal 150.
  • the outwardly protruded finger lock 166 provided at the distal end of the outer plunger barrel 112 reaches in alignment of inner conical groove 120 of outermost barrel 102 which snaps lock therein the groove to completely lock the plunger barrel 112 inside the outermost barrel 102.
  • the needle assembly automatically retracts and gets encapsulated with in the plunger barrel, and the plunger barrel is automatically locked inside the outermost barrel to render the syringe assembly completely locked and quite unusable for any further use, as shown in Fig. 10.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Environmental & Geological Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

The Vacuum Retractable Safety Syringe (VRS) 100 for singe use comprises a plunger barrel assembly 114, outermost barrel 102 and a needle carrier assembly 104 holding a detachable needle 140 along with needle cover 142. The plunger barrel assembly comprises an inner and an outer plunger barrels. The outer plunger barrel 112 is provided with two diametrically opposite longitudinal slots 172 & 173 holding conical notches 145 &146 of finger locks 143 & 144, provided at the distal end of the inner plunger barrel. The inner plunger barrel housing inside the outer plunger barrel is also provided with a second piston seal 150 at proximal end. The outer plunger barrel 112 opening at proximal end is provided with a first piston seal 170 at the outer surface. The plunger plug 110 provided with a centrally positioned furrowed knob 154 at proximal surface is fixedly mounted at the proximal end of the outer plunger barrel. The finger lock 166 is provided at the distal end of outer plunger barrel to prevent the removal of plunger assembly from the outermost barrel. The outer most barrel comprises a uniformly elongated hollow cylindrical tubular body, provided with a conical jacket 126 opening at the proximal end, a finger rest 128 and two sets of uniform, inner circumferential C-grooves 120 and 122 at distal end. A conical needle carrier assembly 104 comprising a hollow conical needle carrier 139, holding a detachable straight hollow hypodermic needle, is fixedly mounted in the conical jacket of the outermost barrel with the help of an elastic O- ring 136. The needle carrier is provided with a cavity 130 with locking means 132 to capture the knob 154 provided in the plunger plug 1 10, which opens in a detachable straight hollow hypodermic needle 140 at proximal end. While working with the syringe, the plunger assembly 114 is pulled in backward direction until the notches 145 & 146 get engage therein the conical groove 122 to fix the inner plunger barrel. Further push of the plunger barrel in forward direction, creates a vacuum between the plunger plug 110 and inner plunger barrel 108. The medicinal dosage may be sucked into the chamber between the outermost barrel and plunger assembly as usual. As soon as the last drop of medicine is injected into the body of patient, the furrowed nipple 154 inserts and snap locks into the cavity 130 of needle carrier assembly 104 with the help of locking members 156 and 132. The plunger assembly 1 14 pushes the O-ring 134 in forward direction, to dislodge the needle carrier, consequently, the plunger plug 110 holding needle carrier along with needle gently retracts in backward direction and finally encapsulates inside the plunger barrel due to the pull of vacuum. Simultaneously, the outwardly protruded finger lock 166 snap locks within the conical groove 120 to completely lock the plunger barrel 112 inside the outermost barrel 102 to render the complete syringe assembly quite unusable for any further use.

Description

TECHNICAL FIELD
The present invention Vacuum-retractable Safety Syringe 1 00 for Single use relates to a safety syringe having an auto retractable needle for use in the medical or dental profession or in personal drug administration so that the physicians, surgeons or other needle operators may be protected from the needle-stick injury during its use. The invention, in particular, relates to an assembly of the safety syringe which is simple and easy in handling, in which the hypodermic needle retracts itself automatically by virtue of self generated vacuum and encapsulate within the barrel as soon as the last drop is injected in the body of patient. The syringe thereafter becomes finally locked -to become non-reusable. The handling of syringe does not require any special training to the operators. It is simple in manufacture.
BACKGROUND
Generally, syringes are simple axial piston pumps with a plunger that fits tightly in a cylindrical barrel. The plunger can be pulled and pushed along inside the barrel, thereby creating a pressure gradient. Additionally, many syringes carry a sharp and penetrating hollow needle that is intended to puncture the skin, mucous membrane and internal organs of humans or animals for injection or removal of fluids, aerosols, or particulate suspensions.
Recently, there has been noticed growing evidences of needle-stick injuries for, not restricted to medical professionals, but also for the children playing in park, a street walkers and the like. Anyone affected by needle-stick injuries may be infected with serious blood born diseases. Further the danger of these injuries may escalate to possible infections from HIV and hepatitis B, even to those medical practitioners who work with these used needles in their normal course of business.
There have been a number of proposals aimed at reducing these needle-stick injuries. ' Such proposals also include auto-retractable syringes. A number of patents and products have also been introduced in the markets relating to various auto-retractable syringes. In the retractable, syringes, when the injection has been adm inistered, the piston is pushed away from the leading end of the barrel by a spring or a similar biasing means and the needle tip is accordingly retracted into the barrel. However these syringes often suffer from the disadvantages i.e. splash occurs back when the needle is caused to be retracted, which makes the injection process compl icated and brings inconvenience for doctors and nurses. Conventionally, to activate the auto-retraction, the plunger of the syringe needs a hard push beyond the normal pressure. Therefore, if the needle of the syringe is drawn from the patient before the auto retraction is activated then it matters little how v iolent the initial kick-back is, On the other hand, if the auto retraction of the needle in the syringe is activated whilst the needle is in the body of the patient, either accidentally or deliberately, it may be quite uncomfortable or cause undesirable damage to the tissues in which the needle is inserted. There is another kind of syringe in which the needle is retracted into the barrel under the action of spring after injection. However, in such kind of retractable syringes, the needle is retracted too fast which may result in bursting out of blood under the body pressure from the punctured hole on the body, which further brings secondary cross infections. The conventional syringes also lack in full-proof locking arrangement as well as effective retraction mechanism to prevent and restrict further use of syringes once used.
Thus, there is an urgent need for auto-retractable single use syringes which may overcome the above mentioned drawbacks and shortcomings to provide a safe, reliable and user friendly auto-retractable syringes that can protect against accidental injuries too.
SUMMARY
An object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with an inner plunger barrel 108. an outer plunger barrel 112, an outermost barrel 102, and a needle carrier assembly 104 holding a hypodermic needle 140 along- with a need le cover 142.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for S ingle use with a uniformly hollovv cylindrical tubular outer plunger barrel, provided with a thumb rest 164 at its distal end D and a piston seal holder at proximal end P for holding a first piston seal 170.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a uniformly hol low cylindrical tubular outer plunger' barrel comprising diametrically as well as oppositely positioned two longitudinal slots 172 and 173 to provide sliding passage to the outwardly protruded conical notches 143 and 144 of inner plunger barrel 108.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use an inner plunger barrel 108 to create vacuum between the inner plunger barrel and the outer plunger barrel. Another object of the present subject matter is to provide the outer plunger barrel 112 with outwardly protruded finger lock 166 at distal end to lock the outer plunger barrel 112 within the outermost barrel 102 by conveniently seating inside the inner circumferential conical groove 120 of the outermost barrel 102 after completion of the injection process.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a uniformly hollow cylindrical tubular inner plunger barrel 108 comprising diametrically as well as oppositely positioned two finger locks 143 and 144 opening at distal end, wherein, each of the finger lock is provided with an outwardly protruded conical notch, having proximal surface perpendicular to the outer surface of the inner plunger barrel, whereas the distal surface of notch is obl iquely inclined to the distal end.
Another object of the present subject matter is to provide the inner plunger barrel a piston seal holder 148, holding the piston seal 150 to create vacuum between the inner as well as outer plunger barrels during the injection process.
Another object of the present subject matter is to provide the Vacuum-retractable K Safety Syringe for Single use with a un iform ly hollow cylindrical tubular outermost barrel 102 comprising a finger rest 128 at the d istal end and further comprising a conical jacket 126 »< at proximal end to hold the needle carrier assembly 104.
Another object of the present subject matter is to provide the outermost barrel 1 02 with two sets of face to face positioned, uniform, inner circumferential conical C-grooves 120 and 122, positioned at some distance from each other at the distal end D of the outer most barrel 102, both set of grooves 120 and 122 being perpendicularly separated by diametrically opposite longitudinal grooves (X and Y), opening at distal end.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with an O-ring 136 to hold the needle carrier assembly 1 04 within the outermost barrel 126 and dislodge the needle carrier assembly after the completion of injection process.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a locking mean at the proximal end of the needle carrier assembly to replace the needle as per requirement. Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a hypodermic straight hollow needle 140 encapsulated within the needle cover 142.
Another object of the present subject matter is to provide the Vacuum-retractable Safety Syringe for Single use with a plunger plug 110 comprising a centrally positioned furrowed nipple 154 at proximal surface, the nipple having the locking means 156 to snap lock with the locking member 132, provided in the cavity 1 30 of needle carrier assembly 104.
Another object of the present subject matter is to provide the plunger plug 104 with the groove 154 to hold the gasket seal 160, so that the plug 110 is held air-tightly within the collar 168 provided at the inner side of the proximal end of outer plunger barrel 112.
Accordingly, the subject matter described herein generally relates to a safety syringe having an auto-retractable needle for use in medical or dental profession or in personal drug administration, so that the physicians, surgeons or other needle operators may be protected from needle-stick injuries after its use. Therefore, the invention, in particular, relates to an assembly of the safety syringe which facilitates simple operation and easy handling, in which the hypoderm ic needle automatical ly retracts itself by virtue of self generated vacuum during operation process and automatically encapsulates within the barrel, as soon as the last drop of medicine is injected in the body of patient. The syringe, thereafter, automatically locks itself to become non-reusable. It describes a simple technique which is easy in manufacture and does not requ ire any special training to the operators for handling
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
These and other features, aspects, and advantages of the present invention will become better understood when the fol lowing detailed description is read with reference to the accompanying drawings in which the like characters represent the like parts throughout the drawings, wherein:
Fig 1 illustrates a line diagram of an outer plunger barrel of Vacuum-retractable Safety Syringe for Single use.
Fig 2 i l lustrates line diagrams of need le carrier assembly of Vacuum-retractable Safety Syringe for Single use.
Fig 3 illustrates line diagrams of needle carrier assembly housed inside the outer barrel of Vacuum-retractable Syringe for Single use. Fig 4(a) il lustrates a l ine diagram of an inner plunger barrel of the Vacuum- retractable Safety Syringe for Single use.
Fig 4(b) illustrates a line diagram of plunger plug of the Vacuum-retractable Safety Syringe for Single use.
Fig 4(c) illustrates line diagrams of outer plunger ban-el of the Vacuum-retractable Safety Syringe for Single use.
Fig 5 il lustrates a line diagram of complete plunger assembly of the Vacuum- retractable Safety Syringe for Single use. .
Fig 6 illustrates a line diagram of the complete assembly of the Vacuum-retractable Safety Syringe for Single use.
Fig 7, 8 and 9 il lustrate line diagrams of various functional stages during injection process of the Vacuum-retractable Safety Syringe for Single use.
Fig 10 illustrates a line diagram of completely locked Vacuum-retractable Safety Syringe for Single use with retracted needle, encapsulated, in plunger barrel.
DETAILED DESCRIPTION
The embodiments of the present subject matter are . described in detail with reference to the accompanying drawings. However, the present subject matter is not lim ited to these embodiments, wh ich are on ly provided to explain more clearly the present subject matter to the person ordinarily skilled in the art of the present disclosure. In the accompanying drawings, like reference numerals are used to indicate the l ike components.
The invention is explained with respect to a safety syringe incorporating an auto retractable needle assembly therein. Generally, the safety syringe includes a syringe barrel and a plunger slidably located therein. The plunger is designed with a proximal and a distal end with piston means associated therewith at its distal end so as to be sealingly slidable within the barrel.
The of the Vacuum-retractable Safety Syringe for Single use (VRS) 100, according to a preferred embodiment of the present subject- matter, is structural ly constructed with an outer plunger barrel 112, inner plunger barrel 108, a plunger plug 110, an outermost barrel 102 and a needle carrier assembly 104 holding a hypodermic needle 140 along with a needle cover 142. The outer plunger barrel 112, as shown in Fig. 4(c), comprises of a uniformly elongated cylindrical U-shaped hollow tubular body opening outs ide at proximal end P, provided with a thumb rest 162 and outwardly protruded finger lock 166 at distal end, two diametrically opposite longitud inal slots 172 & 173 in middle portion and a first piston seal 170 at the outer surface of the proxi mal end of the plunger barrel 112.
The inner diameter of the outer plunger barrel 112 at the proximal end is equal to the outer diameter of the inner plunger barrel 108, which slightly increases to constitute a collar 168 at the inner surface of proximal end of the outer plunger barrel. The inner diameter and the width of collar 1 68 are eq ual to the outer diameter and thickness of the plunger plug 110 respectively. The inner diameter of the collar 168 is provided with a conical groove 169 to hold the plunger plug 110 with the help of gasket seal ring 160 packed between the collar 168 and the outer circumferential surface of the plunger plug 110. The outer plunger barrel 112 is provided with diametrically opposite face to face positioned two uniform longitudinal slots 172 & 173 in the midd le portion of outer plunger barrel 112 to constitute passage for axial movement of the conical notches 145 and 146, provided at the proximal ends of the finger locks 143 and 144.
The inner plunger barrel 1 08, as shown in Fig. 4(a), comprises of a uniformly elongated hollow cylindrical tubu lar body, provided with a seal holder 148 at the proximal end to hold a second piston seal 150. The inner plunger barrel 108 is further provided with oppositely positioned two finger locks 143 and 144 opening at distal end. The distal ends of the finger locks are provided with outwardly protruded conical notches 145 and 146. The proximal end of each of the conical notch is perpendicular to the outer surface of the barrel 108, whereas the distal end is obliquely inclined to the distal end of the barrel 108. The outer diameter of the inner plunger barrel is equal to the inner diameter of collar 168 of the outer plunger barrel 112.
FIG. 4(b) il lustrates the plunger plug 110, wherein the outer diameter and thickness of the plunger plug 110 is respectively equal to the inner diameter and width of the collar 168, provided at the proximal end of the outer plunger barrel 112. At the outer surface of the thickness, the plunger pl ug is provided with a uniform outer circumferential groove 152 in alignment with the groove 169 provided at the inner surface of the collar 168, to hold the plug firmly inside the proximal end of the outer plunger barrel 112 with the help of gasket seal ring 160 sandwiched between the respective circular grooves 169 and 152 of inner plunger barrel 108 and the plunger plug 110.
The plunger plug 110 is central ly designed with a longitudinally furrowed knob 154 at its proximal surface, having its outer diameter equal to the inner surface of the cavity 130 of needle carrier 104. The furrowed knob 154 is advantageously provided with a lock element 156 at proximal end. During the completion of injection process, when the furrowed knob 154 gets insert into the cavity 130 of the needle carrier 104, the lock element 156 snap locks within the needle carrier cavity with the lock element 132, provided at the proximal end of the cavity 130.
The distal end of inner plunger barrel 110 is inserted into the outer plunger barrel 112 through its proximal open end keeping the conical notches 145 & 146 of finger locks 143 and 144 in alignment of the longitudinal slots 172 and 173 in such a manner so that the outwardly protruding notches protrude out passing through the longitudinal passage of slots 172 and 173. During this process the notches press the finger locks 143 and 144 in inward direction ' and on push ing the inner plunger barrel 110 further into the outer plunger barrel 1 12, it conveniently inserts into the outer plunger barrel. After complete insertion of the inner plunger barrel into the outer plunger barrel, the notches 145 & 146 of the finger locks 143 & 144 protrude out passing through the longitudinal slots 172 and 173, as shown in Fig. 5.
After inserting the inner plunger barrel 108 into the outer plunger barrel 112, the plug 110 is fitted inside the proximal end of the outer plunger barrel. The elastic gasket ring 160 is fitted within the circumferential conical groove 152 of the plunger plug 110 and the plunger plug is inserted through its distal end into the outer plunger barrel 112 through its open proximal end in such a manner that the gasket ring is sandwiched and packed between the two inner as well as outer circumferential grooves 169 and 152 provided at the inner surface of collar 168 of the outer plunger barrel and the outer surface of plunger plug 110 respectively. Thus, the plunger plug 110 is air-tightly held inside the proximal end of the outer plunger barrel 112 to constitute a complete plunger assembly 114, as shown in Fig. 5.
The outer most barrel 102, as shown in Fig. 1, comprises a uniformly elongated hollow cylindrical tubular body, provided with a finger rest 128 and two sets of face to face positioned, un iform, inner circumferential C-grooves 120 and 122, positioned at some distance from each other at the distal end D of the outer most barrel 102. The first set of conical groove 120 is obliquely and slidably inclined towards the proximal end of the outer W most barrel 102, whereas the distal end of conical groove is perpendicular to the inner surface of the outermost barrel 102. The second set of conical groove 122 is obliquely and slidably inclined towards the distal end of the outer most barrel 102, whereas the proximal end of conical groove is perpendicular to the inner surface of the outermost barrel 102. The both set of grooves 120 and 122 are perpendicularly separated by diametrically opposite longitudinal grooves (X and Y), opening at distal end as shown in Fig. 1(b). The outer most barrel 102 is customized into a conical jacket 126, opening at the proximal end of the outer most barrel 102 in an embod iment of the present subject matter.
The inner diameter of the outermost barrel 102 is equal to the outer diameter of the outer plunger barrel 112 throughout its length but it slightly increases at the proximal portion of the outermost barrel to constitute a tiny collar 124 to hold the needle carrier assembly.
The vacuum-retractable Safety Syringe 100 also includes a conical needle carrier assembly 104, as shown in Fig. 2, comprising of a hol low conical need le carrier 139, provided with a longitudinal ax ial passage at its centre which is parallel to the outermost barrel 102, in an em bod iment of the present subject matter. The axial passage widens at distal end to constitute a cavity 130, which provides a seat and internal , locking arrangement 132 to capture the knob 154 provided in the plunger plug 110; as explained earlier. The inner diameter of cavity 130 is equal to the outer diameter of the knob 154. The proximal end of the axial passage opens outside at proximal end through a straight hollow hypodermic needle 140. The distal portion of needle carrier 104 is designed parallel to the inner surface of the outermost barrel 102. The conical needle carrier 104 is designed with a collar 138 at distal end of its outer surface. Further, this conical proximal end extends in a removable hollow straight needle 140 attachable at proximal end, in an embodiment of the present subject matter. The hollow needle 140 is advantageously encapsulated in a removable needle cover 142. The conical needle carrier 104 is also structured with an elastic O-ring 136 having inner diameter and thickness equal to the outer diameter and thickness of distal portion of conical needle carrier 104. The outer diameter of O-ring 136 is equal to the slightly enlarged inner proximal d iameter of the outer barrel 102. The outer proximal circumferential edge of O-ring 132 is round in shape.
While assembling the syringe 100 in a preferred embodiment of the present subject matter, the proximal end of needle carrier 104 is first inserted in the outermost barrel 102 along with O-ring 136 through its distal end, keeping the needle 140 directing to proximal end of the barrel 102. The needle assembly easily slides inside the outermost barrel 102. On further pressing in forward direction, the needle carrier assembly seats conveniently inside the outermost barrel within the inner proximal potion provided with slightly enlarged diameter at its proximal end and the needle 140 along with needle cover 142 protrudes out through the proximal opening of outermost barrel 102, as shown in Fig. 3, to constitute complete outermost barrel assembly 106.
Now, the proximal end of the complete plunger assembly 114 holding inner plunger barrel 108 and plunger plug 110, as shown in Fig. 5, is inserted into the outermost barrel containing the needle carrier assemblyl06, as shown in Fig. 3, through its distal end in such a manner, so that the conical notches 145 & 146 protruding out through the longitudinal slots 172 & 173 in complete plunger assembly 114 become in alignment of the longitudinal groove X & Y, provided at the distal end of outer plunger barrel 112. On pressing the complete plunger assembly 114 further into the outermost barrel in forward direction, the notches X & Y slide axially into the outermost barrel because the finger locks 143 & 144 are pressed in inward direction while passing over the slops at the proximal end of the longitudinal grooves X & Y. After inserting the plunger assembly into the outermost barrel, the plunger assembly is rotated in either direction approximately at 80- 120° angle to misalign the notches 145 & 146 from the longitudinal grooves X & Y.
While working with the syringe 100, as shown in Fig. 6, the user has to remove the needle cover 142 to expose the needle 140. The plunger assembly 114 is pulled in backward direction until the notches 145 & 146 become in alignment of circumferential groove 122 of the outermost barrel 102 and get engage therein the conical groove 122, as shown in Fig. 7.
After engagement of conical notches 145 and 146 in conical groove, the further push of the plunger barrel in forward direction, creates a vacuum between the plunger plug 110 and inner plunger barrel 108. The medicinal dosage may be sucked into the chamber between the outermost barrel and plunger assembly as usual, by holding the syringe 100 with the help of the thumb rest 162 and the finger rest 128. Figs 7 to 9 illustrate other embodiments of the present subject matter which show how the medicinal dose may be injected into the body of the patient. While injecting the medicinal dose into the body of patient, the continuous movement of plunger assembly 114 in forward direction simultaneously initiates and executes the following actions at the final stage of completion of injection: Firstly, the furrowed nipple 154 inserts into the cavity 130 of needle carrier assembly 104 through its distal end and gets snap locked therein with the help of locking members 156 and 132 respectively. Thus the needle carrier along with hypodermic needle locks with the plunger plugs 110 at its proximal end.
Secondly, the proximal end of the plunger assembly 114 pushes the O-ring 134 in forward direction, which results the plunger plug 110 to dislodge from the collar 168 of the plunger barrel 112, as shown in Fig. 9. Consequently, the dislodged plunger plug holding needle along with the needle carrier gently as well as smoothly retracts in backward direction due to the pull of vacuum between the plunger plug 110 and the second piston seal 150. Simultaneously, the outwardly protruded finger lock 166 provided at the distal end of the outer plunger barrel 112, reaches in alignment of inner conical groove 120 of outermost barrel 102 which snaps lock therein the groove to completely lock the plunger barrel 112 inside the outermost barrel 102.
' in this way, after the completion of injection process, as soon as the last drop of medicine is injected into the body of patient, the needle assembly automatically retracts and gets encapsulated with in the plunger barrel, and the plunger barrel is automatically locked inside the outermost barrel to render the syringe assembly completely locked and quite unusable for any further use, as shown in Fig. 10.

Claims

We claim: .
1. The Vacuum Retractable Safety Syringe (VRS) 100 for singe use comprises a plunger barrel assembly 114, outermost barrel 102 and a needle carrier assembly 104 holding a detachable needle 140 along with needle cover 142, wherein,
the plunger barrel assembly 114 comprises an outer plunger barrel 112, inner plunger barrel 108 and a plunger plug 110, wherein,
the outer plunger barrel 112 is a U-shaped hollow tubular body opening at proximal end, holding a first piston seal 170 at the outer surface and a collar 168 with conical groove 169 at inner surface at proximal end;
the outer plunger barrel 112 is provided with a , thumb rest 162 and a dista!ly directing outwardly protruded finger lock 166 at distal end; the outer plunger barrel 112 is provided with face to face positioned two diametrically opposite longitudinal slots 172 & 173 in middle portion to hold and facilitate sliding movement to the conical notches 145 and 146 of inner plunger barrel;
an inner plunger barrel 108 comprising a uniformly elongated hollow cylindrical tubular body, provided with a seal holder 148 at the proximal end to hold a second piston seal 150;
the inner plunger barrel further provided with oppositely positioned two finger locks 143 and 144 opening at distal end, wherein the distal ends of the finger locks are provided with outwardly protruded conical notches 145 and 146;
an outer most barrel 102, comprising a uniformly elongated hollow cylindrical tubular body, provided with a conical jacket 126 opening at the proximal end, a finger rest 128 and two sets of face to face positioned, uniform, inner circumferential C-grooves 120 and 122 at distal end, wherein, the grooves 120 and 122 are perpendicularly separated by diametrically opposite longitudinal grooves (X and Y), opening at distal end; a conical need le carrier assembly 104 comprising a hollow conical needle carrier 139, a detachable straight hollow hypodermic needle 140 and an elastic O-ring 134, wherein,
the conical needle carrier 139 is provided with an axial passage which widens at distal end to constitute a cavity 130 provided with locking means 132 to capture the knob 154 provided in the plunger plug 110, wherein,
the proximal end of axial passage extends in a detachable straight hollow hypodermic needle 140 along with needle cover 142 at proximal end of conical needle carrier assembly 104; the conical needle carrier is provided with a collar 138 at distal end to hold the needle carrier assembly inside the outermost barrel 102 with the help of an elastic O-ring 134, wherein,
the elastic O-ring 136 provided with inner diameter and thickness equal to the outer diameter and thickness of distal portion of conical needle carrier 104, constituting a collar 138, whereas the outer diameter is equal to enlarged inner diameter of outermost barrel 102.
The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the inner diameter of the outermost barrel 102 is equal to the outer diameter of the outer plunger barrel 112 throughout its length, which slightly increases at the proximal portion of the outermost barrel to constitute a tiny collar 124 to hold the needle carrier assembly 104.
The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the inner diameter of the outer plunger barrel 112 at the proximal end is equal to the outer diameter of the inner plunger barrel .108, which slightly decreases to constitute a collar 168 provided with inner circumferential groove 169 to hold plunger plug 110 through gasket seal ring 160.
The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the inner diameter and the width of collar 168 are respectively equal to the outer diameter and thickness of the plunger plug 110.
5. The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the proximal end of each of the conical notch is perpendicular to the outer surface of the inner plunger barrel 108, whereas the distal end is obliquely incl ined to the distal end of the inner plunger barrel 108,
6. The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the inner diameter of cavity 130 is equal to the outer diameter of the knob 154.
7. The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the conical needle carrier 139 is designed with a col lar 138 at distal end of its outer surface and the proximal end is conically modified to hold a hypodermic needle 140 through a locking means 141.
8. The Vacuum Retractable Safety Syringe (VRS) for singe use as claimed in claim 1 , wherein the outer diameter of O-ring 134 is equal to the enlarged inner diameter of outermost barrel 102 and the outer proximal circumferential edge of O-ring 134 is round in shape.
9. The Vacuum Retractable Safety. Syringe (VRS) for singe use as claimed in claim 1 , wherein the first set of conical groove 120 is obliquely and slidably inclined towards the proximal end of the outer most barrel 102, whereas the distal end of conical groove is perpendicular to the inner surface of the outermost barrel 102.
10. The Vacuum Retractable Safety Syringe (VRS). for singe use as claimed in claim 1 , wherein the second set of conical groove 122 is obliquely and slidably inclined towards the distal end of the outer most barrel 102, whereas the proximal end of conical groove is perpendicular to the inner surface of the outermost barrel 102.
PCT/IN2013/000657 2012-11-26 2013-10-29 Vacuum-retractable safety (vrs) syringe for single use WO2014080420A2 (en)

Applications Claiming Priority (2)

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IN3625DE2012 2012-11-26
IN3625/DEL/2012 2012-11-26

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WO2004039441A2 (en) * 2002-10-30 2004-05-13 Jun Piao Teng Vacuum auto-retractable safety syringe

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WO2004039441A2 (en) * 2002-10-30 2004-05-13 Jun Piao Teng Vacuum auto-retractable safety syringe
US20040087907A1 (en) * 2002-11-01 2004-05-06 Smith Martin E. Disposable safety syringe

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Publication number Priority date Publication date Assignee Title
WO2016142799A3 (en) * 2015-03-10 2016-11-03 Rathore Jai Hind A fluid injecting system with needle retraction by vacuum
GB2552289A (en) * 2015-03-10 2018-01-17 Hind Rathore Jai A fluid injecting system with needle retraction by vacuum
US10729857B2 (en) 2015-03-10 2020-08-04 Jai Hind Rathore Fluid injecting system with needle retraction by vacuum
GB2552289B (en) * 2015-03-10 2020-12-23 Hind Rathore Jai A fluid injecting system and a method thereof
JP2021003558A (en) * 2015-03-10 2021-01-14 ヒンド ラソア，ジャイ Fluid injection system and method thereof

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