Non-reusable hypodermic syringe
First Claim
1. A single use disposable hypodermic syringe comprising:
- a hollow elongated barrel portion;
a piston in sealing engagement with and axially translated along said barrel portion;
a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston;
a walled chamber disposed proximate the other end of said barrel portion;
a first plug member disposed in said chamber and moveable therein from a rearward position to a forward position;
a second plug member disposed forwardly of said first plug member;
fluid flow means disposed in said first plug member for allowing fluid flow therethrough;
means defined by said first plug member for maintaining said first plug member in said rearward position upon air being drawn into and ejected from said barrel portion through said fluid flow means in response to translation of said piston within said barrel portion and for permanently maintaining said first plug member in said forward position upon said first plug member being moved to said forward position by said liquid during ejection thereof from said syringe; and
means defined by said second plug member for sealing said fluid flow means upon said first plug member being forced to said forward position and said piston being retracted within said barrel portion toward said one end thereof to prevent any additional liquid from being drawn into said barrel portion through said fluid flow means thereby rendering said syringe non-reusable.
1 Assignment
0 Petitions
Accused Products
Abstract
A single use disposable hypodermic syringe having a hollow elongated barrel portion, a piston and sealing engagement with an axially translatable along the barrel portion, a piston rod secured to the piston and projecting from the rearward end of the barrel portion for use in reciprocating the piston, a walled chamber disposed proximate the forward end of the barrel portion and plug means disposed in the chamber and moveable therein from a rearward position to a forward position in response to liquid being forced against the plug member by the piston. The plug member defines fluid passages therein to allow fluid flow about the plug member and an annular flange which cooperates with the interior surface of the chamber for maintaining the plug member in the rearward position upon air being passed through the fluid passages in response to translation of the piston within the barrel portion. The annular flange also cooperates with a second portion of the chamber wall for permanently maintaining the plug member in the forward position upon the plug member being moved to the forward position by the liquid during ejection thereon from the syringe. With the plug member in the forward position, the annular flange thereon seals the fluid passages upon the piston being retracted within the barrel portion toward the rearward end thereof to prevent any additional liquid from being aspirated into the barrel portion of the syringe about the plug member thereby rendering the syringe non-reusable.
70 Citations
38 Claims
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1. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translated along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion; a first plug member disposed in said chamber and moveable therein from a rearward position to a forward position; a second plug member disposed forwardly of said first plug member; fluid flow means disposed in said first plug member for allowing fluid flow therethrough; means defined by said first plug member for maintaining said first plug member in said rearward position upon air being drawn into and ejected from said barrel portion through said fluid flow means in response to translation of said piston within said barrel portion and for permanently maintaining said first plug member in said forward position upon said first plug member being moved to said forward position by said liquid during ejection thereof from said syringe; and means defined by said second plug member for sealing said fluid flow means upon said first plug member being forced to said forward position and said piston being retracted within said barrel portion toward said one end thereof to prevent any additional liquid from being drawn into said barrel portion through said fluid flow means thereby rendering said syringe non-reusable.
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2. A single use disposable hypodermic syringe comprising:
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a hollow elongated constant diameter barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion; a first plug member disposed in said chamber and defining means therein to allow fluid flow therethrough, said plug member being moveable from a rearward position to a forward position in response to liquid being forced against said plug member by said piston; a second plug member disposed in said chamber forwardly of said first plug member and defining means for allowing liquid flow about said second plug member for ejection from said syringe and means for sealing said fluid flow means in said first plug member upon said second plug member being forced against said first plug member when said first member is in said forward position; and means for maintaining said first plug member in said rearward position upon air being passed therethrough in response to translation of said piston within said barrel portion and for permanently maintaining said plug member in said forward position upon said first plug member being moved to said forward position by said liquid during ejection thereof from said syringe such that upon said first plug member being forced to said forward position and said piston being retracted within said barrel portion toward said one end thereof, said second plug member is caused to be drawn rearwardly within said chamber against said first plug member, sealing said fluid flow means therein and preventing any additional liquid from being aspirated into said barrel through said first plug member thereby rendering said syringe non-reusable. - View Dependent Claims (3, 4, 5, 6)
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7. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel having a forward end and a rearward end; a piston in sealing engagement with and axially translatable along a first portion of said barrel; a piston rod secured to said piston and projecting from the rearward end of said barrel for use in reciprocating said piston; a first plug member disposed in a second portion of said barrel forwardly of said piston, said member being moveable from a rearward position to a forward position within said second barrel portion in response to liquid being forced against said member by said piston and defining a fluid flow channel extending axially therethrough; a second plug member disposed in said barrel forwardly of said first plug member and defining one or more channels therein for the passage of fluid about said second plug member and means thereon for sealing said fluid flow channel in said first plug member upon said plug members being disposed in an abutting relationship to prevent fluid flow through said channel; and means for maintaining said first plug member in said rearward position and spaced from said second plug member to allow a variable volume of air to be drawn into and ejected from said barrel through said channel in said first plug member and about said second plug member in response to reciprocation of said piston within said barrel prior to liquid being drawn into said barrel whereby said syringe can operate as an air pump and, upon liquid being drawn into said barrel about said second plug member and through said channel in said first plug member and said first plug member being forced forwardly within said barrel to said forward position during ejection of liquid from said barrel by the force of the liquid acting on said first plug member, said means maintains said first plug member in said forward position such that upon said piston being retracted toward said rearward end of said barrel, said second plug member is caused to be drawn rearwardly against said first plug member, sealing said fluid flow channel in said first plug member and preventing any additional fluid from being drawn into said barrel through said first plug member thereby rendering said syringe non-reusable. - View Dependent Claims (8, 9, 10, 11)
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12. A single use hypodermic syringe comprising:
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a hollow elongated barrel having a forward end, a rearward end, and a constant diameter portion adjacent said rearward end; a piston in sealing engagement with and axially translatable along said constant diameter portion of said barrel; a piston rod secured to said piston and projecting from said rearward end of said barrel for use in reciprocating said piston; a first plug member disposed in said barrel forwardly of said piston and defining a fluid flow channel extending axially therethrough and means cooperating with said barrel for retaining said plug member within a first portion of said barrel as a variable volume of air is drawn into and ejected from said barrel in response to translation of said piston within said barrel prior to liquid being drawn into said barrel whereby said syringe can operate as an air pump, said means, retaining said plug member within a second portion of said barrel upon liquid having been drawn into said barrel and ejected therefrom through said channel so as to move the plug from first to second portion of the barrel; and a second plug member spaced from said first plug member, said second plug member having flow passages therein for the passage of fluid about said second plug member and means thereon for sealing said channel in said first plug member upon said first plug member being disposed within said second portion of said barrel and said piston being retracted toward said rearward end thereof whereby liquid is prevented from being further drawn into said barrel through said first plug member, rendering said syringe non-reusable. - View Dependent Claims (13, 14)
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15. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel having a forward end, a rearward end and a constant diameter portion adjacent said rearward end; a piston in sealing engagement with and axially translatable along said constant diameter portion of said barrel; a piston rod secured to said piston and projecting from said rearward end of said barrel for use in reciprocating said piston; a cap member secured to and disposed about said forward end of said barrel and defining a central opening therein; a cannula means carried by said cap member and communicating with said central opening; a first plug member disposed in said barrel forwardly of said piston and defining a fluid flow channel extending axially therethrough, a first stop means adapted to abut a first shoulder defined by said barrel to limit the forward movement of said plug member within said barrel, and an annular resilient flange member in sealing engagement with said barrel to prevent fluid flow therebetween and retain said plug member within a first portion of said barrel as a variable volume of air is drawn into and out of said barrel through said cannula means prior to liquid being drawn into said barrel whereby said syringe can operate as an air pump and, upon said plug member being forced forwardly of said first portion of said barrel during the ejection of liquid from said barrel by the force of the liquid acting on said plug member, to cooperate with a second shoulder defined by said barrel to retain said plug member within a second forward portion of said barrel; and a second plug member disposed forwardly of said first plug member and defining means thereon for sealing said fluid channel in said first plug member upon said first plug member being disposed in said second forward portion of said barrel and said piston being retracted toward said rearward end of said barrel, whereby any additional liquid is prevented from being drawn into said barrel through said flow channel in said first plug member thereby rendering said syringe non-reusable. - View Dependent Claims (16, 17)
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18. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion; and axially translatable plug means constructed of a liquid impervious material disposed in said chamber and movable therein from a rearward position to a forward position, said plug means defining fluid flow means therein, said fluid flow means being continuously open when said plug means is in said rearward position and, prior to liquid being drawn into said barrel portion, a allowing a variable volume of air to pass therethrough and be drawn into and ejected from said barrel portion in response to translation of said piston within said barrel portion during the use of the syringe as an air pump and, upon liquid being drawn into said barrel portion through said fluid flow means and least a portion thereof ejected from said syringe, said plug means sealing said fluid flow means in response to said piston being retracted within said barrel portion toward said one end thereof and preventing any additional liquid from being aspirated into said barrel portion through said fluid flow means thereby rendering said syringe non-reusable. - View Dependent Claims (19)
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20. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a first plug member disposed in a portion of said barrel forwardly of said piston and moveable from a rearward position to a forward position in response to liquid being forced against said plug member by said piston, said plug member defining a fluid flow channel therein for allowing a variable volume of air to pass therethrough and be drawn into and ejected from said barrel in response to translation of said piston within said barrel prior to liquid being drawn into said barrel whereby said syringe can operate as an air pump; means for permanently maintaining said first plug member in said forward position upon said plug member being moved to said forward position; and a second plug member movably disposed in said barrel forwardly of said first plug member, said second plug member defining closure means thereon for sealing said fluid flow channel upon said first plug member being disposed in said forward position and said closure means being drawn into sealing engagement with said channel upon the retraction of said piston within said barrel.
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21. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion; a plug member disposed in said chamber and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston, said plug member having a fluid flow channel therein allowing for the passage of fluid therethrough to and from said barrel portion when said plug member is in said rearward position; resilient retaining means carried by said plug member for retaining plug member in said rearward position prior to liquid being drawn into said barrel portion and allowing a variable volume of air to be drawing into and ejected from said barrel portion through said channel when said piston is reciprocated within said barrel portion during the use of said syringe as an air pump; and means disposed in said chamber for closing said fluid flow channel in response to said piston being retracted within said barrel portion toward said one end thereof upon liquid having been drawn into said barrel portion and said plug member moved to said forward position by the ejection of at least a portion of said liquid from said barrel portion thereby preventing any additional liquid from being drawn into said barrel portion and rendering said syringe non-reusable. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion, said chamber having a first annular side wall portion extending about a rearward portion thereof, a second annular side wall portion extending about a forward portion thereof and defining an enlarged diameter portion of said chamber, and an annular shoulder disposed in said chamber between said first and second wall portions; a plug member disposed in said chamber and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston, said plug member defining a body portion, a cylindrical portion disposed rearwardly of said body portion, and a rear plug surface at the rearward end thereof; a resilient flange defined by said plug member and disposed thereon forwardly of said body portion, said flange defining a forward plug surface at the forward end thereof, an annular side wall adjacent said forward plug surface, and a diameter greater than the inner diameter of said first wall portion of said chamber and less than the diameter of said second wall portion, said flange being in a flexed disposition and bearing against said first wall portion of said chamber when said plug member is in said rearward position; a firs fluid flow channel disposed in said flange and extending through said forward plug surface and a forward portion of said annular side wall, said fluid flow channel communicating with said barrel portion, thereby allowing for the passage of fluid therethrough to and from said barrel portion, said flange maintaining said plug member in said rearward position prior to liquid being drawn into said barrel portion and allowing a variable volume of air to be drawn into and ejected from said barrel portion through said fluid flow-channel when said piston is reciprocated within said barrel portion during the use of said syringe as an air pump; and upon said plug member being moved to said forward position by liquid being forced against such said plug member by said piston, said flange flexes outwardly within said enlarged diameter portion of said chamber such that upon said piston being subsequently retracted within said barrel portion toward said one end thereof, said flange is drawn against said shoulder in said chamber, sealing said fluid flow channel and preventing any additional liquid from being drawn into said barrel portion, thereby rendering said syringe non-reusable. - View Dependent Claims (28)
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29. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion and defining an annular shoulder therein; a plug member disposed in said chamber and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston, said plug member having a fluid flow channel therein for the passage of fluid therethrough to and from said barrel portion when said plug member is in said rearward position and defining a resilient retaining means for retaining said plug member in said rearward position prior to liquid being drawn into said barrel portion and allowing a variable volume of air to be drawn into and ejected from said barrel portion through said channel when said piston is reciprocated within said barrel portion during the use of said syringe as an air pump and, upon liquid being drawn into said barrel portion through fluid flow channel and at least a portion thereof ejected from said barrel portion, said plug member cooperates with said shoulder to seal said channel in response to said piston being retracted within said barrel portion toward said one end thereof, thereby preventing any additional liquid from being drawn into said barrel portion through said channel and rendering said syringe non-reusable. - View Dependent Claims (30)
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31. A single use disposable hypodermic syringe comprising:
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a hollow elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion; a first plug member disposed in said chamber and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston; a fluid flow channel extending axially through said first plug member for allowing a variable volume of air to pass therethrough and be drawn into and ejected from said barrel portion when said first plug member is in said rearward position; means for retaining said first plug member in said rearward position when said piston is reciprocated within said barrel portion prior to liquid being drawn into said barrel portion during the use of the syringe as an air pump; means for permanently maintaining said first plug member in said forward position upon said plug member being moved to said forward position by liquid being forced against said first plug member by said piston during the ejection thereof from said barrel portion; and a second plug member disposed in said barrel portion forwardly of said first plug member, said second plug member being axially movable within said barrel portion and defining closure means thereon for sealing said fluid flow channel upon said first plug member being disposed in said forward position and said closure means being drawn into sealing engagement with said first plug member by the retraction of said piston within said barrel portion toward said one end thereof.
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32. A single use disposable hypodermic syringe comprising:
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an elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion, said chamber having a first annular wall portion extending about a rearward portion thereof, a second wall portion extending about a forward portion thereof and defining an enlarged diameter portion of said chamber, and an annular shoulder disposed in said chamber between said first and second wall portions; a fluid flow channel disposed in said first wall portion and said shoulder communicating said forward portion of said chamber with said rearward portion thereof; a plug member disposed in said chamber and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston; and an annular resilient flange carried by said plug member and bearing against said first wall portion of said chamber when said plug member is in said rearward position, retaining said plug member in said rearward position prior to liquid being drawn into said barrel portion and allowing a variable volume of air to be drawn into and ejected from said barrel portion through said fluid flow channel when said piston is reciprocated within said barrel portion during the use of said syringe as an air pump, said flange extending radially outwardly from said plug member within said enlarged diameter portion of said chamber when said plug member is in said forward position and, upon said piston being retracted within said barrel portion toward said one end thereof when said plug member is in said forward position, said flange bears against said shoulder, closing said fluid flow channel and preventing any additional liquid from being drawn into said syringe barrel portion. - View Dependent Claims (33, 34)
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35. A single use disposable hypodermic syringe comprising:
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an elongated barrel portion; a piston in sealing engagement with and axially translatable along said barrel portion; a piston rod secured to said piston and projecting from one end of said barrel portion for use in reciprocating said piston; a walled chamber disposed proximate the other end of said barrel portion and defining an annular shoulder therein; a plug member having a rearward end and a forward end and disposed in said chamber proximate said annular shoulder and movable therein from a rearward position to a forward position in response to liquid being forced against said plug member by said piston; a fluid flow channel disposed in said shoulder and extending rearwardly of said rearward end of said plug member when said plug member is in said rearward position for the passage of fluid therethrough to and from said barrel portion; a resilient retaining means carried by said plug member for retaining said plug member in said rearward position prior to liquid being drawn into said barrel portion and allowing a variable volume of air to be drawn into and ejected from said barrel portion through said fluid flow channel when said piston is reciprocated within said barrel during the use of the syringe as an air pump and, upon liquid being drawn into said barrel portion through said fluid flow channel and at least a portion thereof ejected from said barrel portion, said resilient retaining means flexes outwardly to cooperate with said annular shoulder to seal said fluid flow channel in response to said piston being retracted within said barrel portion toward said one end thereof, thereby preventing any additional liquid from being drawn into said barrel portion through said channel and rendering said syringe non-reusable. - View Dependent Claims (36, 37, 38)
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Specification