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1. WO2014072994 - FOLDED PLUNGER AUTO RETRACTABLE SYRINGE FOR SINGLE USE

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[ EN ]


FOLDED PLUNGER SYRINGE FOR SINGLE USE TECHNICAL FIELD The present invention 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 surgeons or other needle operators may be protected from the injury during its The in relates to an assembly of the safety syringe which is simple and easy in 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 The syringe thereafter becomes finally locked to become The handling of syringe docs not require any special training to the It is simple in BACKGROUND syringes are simple axial piston pumps with a plunger that fits tightly in a cylindrical The plunger can be pulled and pushed along inside the thereby creating a pressure many syringes carry a sharp and penetrating hollow needle that is intended to puncture the mucous membrane and internal organs of humans or animals for injection or removal of or particulate there has been noticed growing evidences of injuries not restricted to medical children playing in a street walkers and the Anyone affected by injuries may be infected with serious blood born Further the danger of these injuries may escalate to possible infections from HIV and hepatitis even to those medical practitioners who work with these used needles in their normal course of There have been a number of proposals aimed at reducing these Such proposals also include A number of patents and products have also been introduced in the markets relating to various In the retractable when the injection has been 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 However these syringes often suffer from the disadvantages splash occurs back when the needle is caused to be which makes the injection process complicated and brings inconvenience for doctors and to activate the the plunger of the syringe needs a hard push beyond the normal if the needle of the syringe is drawn from the patient before the auto retraction is activated then it matters little how violent the initial On the other if the auto retraction of the needle in the syringe is activated whilst the needle is in the body of the either accidentally or it may be quite uncomfortable or cause undesirable damage to the tissues in which the needle is There is another kind of syringe in which the needle is retracted into the barrel under the action of spring after in such kind of retractable the needle is retracted too fast which may result in bursting out of blood under the body pressure from the punctured hole on the which further brings secondary cross The conventional syringes also lack in locking arrangement as well as effective retraction mechanism to prevent and restrict further use of syringes once there is a urgent need for auto retractable single use syringes which may overcome the above mentioned drawbacks and shortcomings to provide a reliable and user friendly auto retractable syringes that can protect against accidental injuries SUMMARY An object of the present subject matter is to provide a folded plunger auto retractable syringe for single Another object of the present subject matter is to provide a folded plunger auto retractable syringe with a folded plunger Another object of the present subject matter is to provide a folded plunger assembly that includes an inner plunger an outer plunger barrel and a plunger Another object of the present subject matter is to provide a folded plunger assembly that includes an barrel to hold the folded plunger Another object of the present subject matter is to provide a auto retractable syringe with a plunger plug to be inserted in an outermost Another object of the present subject matter is to provide the plunger plug with a longitudinally furrowed Another object of the present subject matter is to provide a needle carrier to the Another object of the present subject matter is to provide an to support the needle carrier and to dislodge the needle carrier to actuate the retraction Another object of the present subject matter is to provide the plunger plug with a longitudinally furrowed Another object of the present subject matter is to create a vacuum when the plunger is pulled within the Another object of the present subject matter is to uncover the needle of the syringe during the time of injecting or retracting the Another object of the present subject matter is to lock the plunger barrel inside the outermost barrel after Another object of the present subject matter is to provide the inner plunger barrel with a pair of oppositely positioned finger locks on either end to get engaged with the outer plunger Another object of the present subject matter is to provide the inner plunger barrel with a piston seal holder structured at the proximal end for holding a piston the subject matter described herein generally relates to a safety syringe having an auto retractable needle for use in medical or denial profession or in personal drug administration so that the surgeons or other needle operators may be protected from injuries after its the in relates to an assembly of the safety syringe which facilitates simple operation and easy in which the hypodermic needle retracts itself automatically by virtue of self generated vacuum and encapsulates within the barrel as soon as the last drop is injected in the body of The syringe thereafter becomes automatically locked to become The handling of syringe does not require any special training to the It is also simple in BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS These and other and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the 1 illustrates a line diagram of an inner plunger barrel of a folded plunger retractable illustrates a line diagram of an outer plunger barrel of a folded plunger retractable 1 illustrates a line diagram of a plunger plug of a plunger 2 illustrates a line diagram pf a folded plunger assembly of a folded plunger retractable illustrates a line diagram of needle carrier of a folded plunger illustrates a line diagram of an outermost barrel of a folded plunger retractable illustrates a line diagram of a needle carrier assembly housing in the outermost barrel of a folded plunger 4 illustrates a line diagram of an assembly for a complete folded plunger auto retractable 5 illustrates inner parallel grooves and provided at the distal end of the outermost barrel of a folded plunger 6 illustrates a complete assembly of a folded plunger 7 illustrates a united assembly of the two plunger barrels in a folded plunger retractable 8 illustrates the push of the plunger within the barrel in a folded plunger retractable 9 illustrates the pull of the plunger within the barrel in a folded plunger retractable 10 illustrates retraction and encapsulation of needle assembly inside the outermost barrel and a complete lock of a plunger barrel in folded plunger DETAILED DESCRIPTION The embodiments of the present subject matter are described in detail with reference to the accompanying the present subject matter is not limited to these embodiments which are only provided to explain more clearly the present subject matter to the person ordinarily skilled in the art of the present hi the accompanying like reference numerals are used to indicate like The invention is explained with respect to a safety syringe incorporating an auto retractable needle assembly the safety syringe includes a syringe and a plunger slidably located The plunger is designed with a proximal and a distal end with piston means associated therewith at its proximal end so as to be sealingly slidable within the The safety syringe according to a preferred embodiment of the present subject is structurally constructed with an inner plunger barrel an outer plunger barrel a plunger plug a needle carrier 108 and an outermost barrel The inner plunger barrel as shown in 1 is a uniformly elongated hollow cylindrical tubular body provided with a thumb rest 112 at its distal end and a piston seal holder 114 at the proximal end for holding a piston seal in an embodiment of the present subject The inner plunger barrel 102 is designed with at least one oppositely outwardly protruded pair of finger locks opening and directing outwardly towards distal as well as proximal V ends The finger locks 18 and are designed and shaped by cutting the wall of plunger barrel The inner plunger barrel 102 is also provided with two uniform circumferential oppositely face to face positioned conical 122 on outer surface at proximal The outer plunger barrel as shown in 1 is a uniformly elongated hollow cylindrical tubular body provided with a second piston seal holder 124 at proximal end for holding another piston seal The outer plunger barrel 104 is designed with the provision of at least one oppositely positioned pair of finger locks and opening and directing towards the either end of the outer plunger barrel In the embodiment of present subject matter the tooth of finger lock 156 is directed to distal end and is protruded inwardly in normal The proximal surface of tooth is designed perpendicular to the inner surface of barrel whereas the distal surface is obliquely inclined to the proximal finally constituting an oblique The tooth of finger lock 156 is almost double in thickness in comparison to the walls of the outer plunger In another embodiment of present subject the finger lock 158 is directing to the proximal end and protruded outwardly in normal It is provided with tooth and The half of the proximal portion of the outwardly protruded tooth is obliquely inclined to the distal whereas the distal portion of tooth is perpendicular to the outer surface of barrel finally constituting an outwardly protruded oblique The proximal as well as distal surfaces of tooth are parallel to each other as well as perpendicular to the outer surface of barrel The thickness of tooth of finger lock 158 is also almost double in comparison to the walls of the outer plunger In normal state the tooth protrudes in outward direction whereas the tooth remains in the level of inner surface of barrel The teeth and are designed and shaped by cutting the walls and surfaces of the barrel Tooth is shaped and designed in such a manner that it may conveniently seat inside the inner circumferential conical groove 144 of the barrel in order to snap lock the barrel 104 with the outermost barrel The tooth is also designed and shaped in such a so that it may conveniently seal within the circumferential groove 136 of the plunger plug 106 when the tooth is pressed FI shows the outermost barrel 110 which is a uniformly elongated hollow cylindrical tubular provided with a finger rest a uniform inner circumferential conical groove 130 and two oppositely positioned parallel inner grooves and opening at the distal end of barrel 110 in an embodiment of the present subject The conical groove 130 is inclined obliquely to the proximal end of the barrel 110 to facilitate sliding of an elastic 132 and the plunger assembly inside the outermost barrel 110 after the finger lock 118 becomes in normal state with the completion of the The outermost barrel 110 also includes a conical jacket 134 opening outside at proximal in an embodiment of the present subject In an embodiment of the present subject the outer diameter of the outer plunger barrel 104 is uniformly equal to the inner diameter of the outermost barrel 110 and uniformly equal to the outer diameter of distal portion D of the inner plunger barrel the inner diameter of outer plunger barrel 104 is uniformly equal to the outer diameter of remaining proximal portion P of inner plunger barrel In another embodiment of the present subject the outer diameter of the distal portion of the inner plunger barrel 102 is uniformly equal to the outer diameter of the outer plunger 104 and further equal to the inner diameter of the outermost barrel 1 the outer diameter of remaining proximal portion of inner plunger 102 is uniformly equal to the inner diameter of the outer plunger barrel illustrates the plunger plug 106 in which the outer diameter is equal to the inner diameter of outer plunger barrel 104 of the folded plunger in an embodiment of the present subject The plunger plug 106 is provided with a thickness 138 having uniform circumferential groove The plunger plug 106 is centrally designed with a longitudinally furrowed knob 140 at its proximal The furrowed knob 140 is positioned parallel to the outermost barrel 1 The furrowed knob 140 is advantageously provided with a lock element 142 at proximal The distal portion of this plunger plug is inserted in the outer plunger barrel 104 through its proximal positioning the circumferential groove 136 of plunger plug 106 in alignment of inwardly protruded tooth of linger lock 158 as shown in 1 The safety syringe 100 also includes a conical needle carrier assembly as shown in provided with a longitudinal axial passage at its centre which is parallel to the plunger barrel in an embodiment of the present subject The axial passage widens at distal end to constitute a cavity which provides a seat and internal locking arrangement 148 to capture the knob 140 provided in the plunger plug as explained earlier with reference to The inner diameter of cavity 146 is equal to the outer diameter of the knob The proximal end of the axial passage opens in a straight hollow hypodermic needle The distal portion of needle carrier 108 is designed parallel to the inner surface of the outermost barrel 1 The conical needle carrier 144 is designed with a col lar 150 at proximal end of its outer this conical proximal end extends in a removable hollow straight needle 152 attachable at proximal in an embodiment of the present subject The hollow needle 152 is advantageously encapsulated in a removable needle cover The conical needle carrier 144 is also structured with an elastic 132 having inner diameter and thickness equal to the outer diameter and thickness of distal portion of conical needle carrier The outer diameter of ring 132 is equal to the slightly enlarged inner proximal diameter of the outer barrel 1 10 in which the outer proximal circumferential edge of 132 is round in While assembling the syringe 100 in a preferred embodiment of the present subject the proximal end of inner plunger barrel 102 is inserted in the outer plunger barrel 104 through its distal end in such a way that the inwardly protruded tooth of finger lock 156 becomes in alignment of the flat portion provided between two oppositely positioned face to face circumferential conical 122 at the outer surface of inner plunger barrel so that the tooth of finger lock 156 may conveniently slide over the flat portion available between the two After slight insertion of inner plunger barrel 102 into the outer plunger barrel the lock 120 is slightly pressed inwardly to facilitate the complete insertion of rest of the inner plunger barrel 102 into the outer plunger barrel With the slide of the inner plunger barrel 102 inside the outer plunger barrel the normal position of inwardly protruded finger lock 152 is changed to become strained and the tooth protrudes in outward At this the distal portion of plunger plug 106 is inserted in the outer plunger barrel 104 through its proximal positioning the circumferential groove 136 of plunger plug 106 in alignment of inwardly protruded tooth of finger lock 158 as shown in 1 In this the inner plunger barrel 102 is inserted in the outer plunger barrel 104 at its full length to constitute a folded plunger assembly 200 along with plunger plug as shown in the plunger assembly 200 is ready to be inserted in the barrel but the conical needle carrier 108 is first inserted in the outermost barrel before the insertion of folded plunger assembly 200 along with plunger plug as shown in The proximal end of needle carrier 108 is first inserted in the outermost barrel 1 10 along with 132 through its distal keeping the needle 152 directing to proximal end of the barrel The needle assembly easily slides inside the outermost barrel After inserting the needle carrier assembly 108 in barrel the proximal end of the plunger assembly 200 is inserted into the outermost barrel 1 10 with the help of thumb rest 112 and the finger rest 128 in such a way that the outwardly protruded tooth of finger lock 156 becomes in alignment of the groove and provided at the distal end of outermost barrel 1 as shown in which finally slides into the inner circumferential conical groove 130 provided at the inner surface at the distal end of outermost barrel The tooth has been designed to slide into the outermost barrel 110 easily and conveniently through the parallel grooves and On further pressing the plunger 200 the tooth of the finger lock 158 is automatically pressed inwardly and seats conveniently inside the circumferential groove 136 of the plunger plug holding the plug This makes the plunger plug 106 to get firmly held inside the outer plunger barrel 104 at its proximal In an embodiment of the present subject a further push of the plunger barrel assembly inside the outermost barrel 110 traps the air between the plunger assembly 200 and the needle assembly which prevents the danger of insertion of knob 140 into the opening cavity 146 of the conical needle carrier When the tooth of finger lock 156 strained in outward direction occupies the seat in the inner circumferential groove the plunger assembly 200 is rotated in either direction or by approximately angle so that the plunger assembly 200 becomes fixed at this position due to the misalignment of outwardly protruded lock 156 occupying seat in groove 130 from the parallel grooves x and this plunger assembly 200 may neither be pushed further inside the outermost barrel nor it may be pulled out of the barrel 110 as evident from 6 illustrates the complete assembly of the safety syringe 100 according to the present subject While working with folded plunger the user has only option to pull out the inner pl unger barrel 102 by holding the safety syringe 100 with the help of the thumb rest 112 and the finger rest When the inner plunger barrel 102 is pulled out at its full a vacuum V is created between the plunger plug 106 and the piston seal 116 of the inner plunger barrel On pulling the inner plunger barrel 102 out of the the outwardly strained finger lock 156 already occupying the circumferential groove 130 of the plunger barrel as soon as comes in alignment Of 122 provided on the surface of inner plunger barrel 102 at proximal the outwardly strained finger lock 156 becomes in normal state and snap locks the finger lock 120 opens in outward direction and snap holds the walls of inner and outer plunger barrel and The two plunger barrels and thus unite together and catch hold each other firmly to behave like a single plunger barrel as shown in In the united plunger barrel is attempted to be pulled out completely from the outer most barrel the tooth of finger lock when comes in alignment with the conical circumferential groove 130 of the outer most restores its normal state and expands in outward direction to seat inside the conical groove 130 due to the space provided by the groove which ultimately prevents further retraction of united plunger barrel in backward the united plunger barrel may not be removed from the outer plunger barrel On the other on pressing the united plunger barrel in forward the shaped conical design of the inner circumferential groove 1 being inclined to proximal facilitates the tooth to slide the united plunger barrel easily in forward In this the united plunger barrel be moved in back and forth direction within the outermost plunger but cannot be removed out from the outer plunger The united plunger barrel is now pushed into the outermost barrel 110 which results sliding of needle assembly 108 in forward The needle assembly finally seals inside the conical jacket 134 at the proximal end of the outermost barrel The elastic associated with the conical needle occupies its seat inside the proximal portion of the barrel 1 10 having slightly enlarged after crossing over the collar formed within the proximal portion of outer most barrel 110 due to slightly enlarged diameter of axial This makes the needle 152 to come out of the opening provided at the proximal end of outermost barrel 1 10 along with protecting cover 154 as il lustrated in 9 shows how the needle cover 154 is removed to uncover the needle The needle may also be replaced as per the requirement with the help of inner lock provided The medicinal dosage may be sucked inside the outermost barrel 110 by pulling the plunger assembly The medicinal dose may also be injected into the body of the patients as shown in another embodiment of While injecting the dose with the safety syringe according to the present subject the proximal end of outer barrel 124 pushes the 132 in forward direction to dislodge the needle carrier when injection is likely to The forward movement of plunger assembly 200 makes the furrowed knob 140 of the plunger plug 106 to insert into the cavity 146 of the needle carrier which gets therein the cavity 146 as soon as the last drop of medicine is injected in body of In the same embodiment of the present subject the tooth of finger lock provided at the proximal end of outer plunger barrel 104 becomes in unstrained slate as soon as it becomes in alignment of conical circumferential groove 144 provided at the inner surface of outermost barrel The inner tooth simultaneously leaves the plunger plug free which moves in backward direction the distal end of the plunger due to the vacuum V already existing inside the plunger the attached with the 144 along with needle 152 smoothly and gently slides in backward direction to the distal end of plunger retracting the needle and finally encapsulating it inside the The finger lock 118 also simultaneously becomes in alignment with the conical circumferential groove 130 of the outermost barrel and opens itself automatically to expand in outward direction to become in normal which ultimately snaps lock the inner circumferential groove resulting in the complete lock of plunger barrel inside the outermost barrel 110 as shown in This results in the locking of the plunger assembly 200 inside the syringe 100 along with retracted needle which advantageously renders the syringe assembly completely useless for any further The folded plunger syringe 100 according to present subject matter facilitates an automatic control on the movement of plunger inside the thus providing the apt pressure and method of injecting as well as retracting the fluid through the the retractable syringes 100 as per the present subject matter may be disposed off safely in a container as there is no option to such used In other the present invention facilitates the of the used syringe by virtue of the retention of collapsed needle encapsulated within the possible infections from hepatitis and the like may be reduced to a greater the safety syringe according to the present subject matter is and easy in manufacture that encourages its usage Although the invention has been described with reference to specific this description is not meant to be construed in a limiting Various modifications of the disclosed as well as alternate embodiments of the will become apparent to the person skilled in the art upon reference to the description of the It contemplated that such modifications can be made without departing from the spirit or scope of the present invention as insufficientOCRQuality