Safety syringe
First Claim
1. A safety syringe assembly, comprising:
- an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel,a plunger slidably mounted in said barrel and having a longitudinal open channel;
a needle;
a needle holder mounting said needle at a distal end thereof and slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which said needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel;
a compression spring mounted inside of said barrel and means supporting a distal end portion of said spring against expansion;
said spring urging said needle holder toward its retracted position; and
a latch arrangement having a closed position in which said needle holder is latched relative to said barrel to hold said needle holder in its advanced position against the urging of said spring, and an open position in which said needle holder is unlatched relative to said barrel to allow said spring to expand in a proximal direction to move said needle holder to its retracted position;
said latch arrangement including a radially projecting arm on one of said needle holder and said barrel by which the needle holder is directly or indirectly engaged with the barrel, at least when in its closed position.
1 Assignment
0 Petitions
Accused Products
Abstract
A single-use safety syringe assembly comprises an elongated, generally cylindrical barrel which forms a hollow nozzle located at the distal end of the barrel and which opens into the interior of the barrel. A plunger is slidably mounted in the barrel and forms a longitudinal cavity. A needle holder carries a hollow needle on its distal end, and the needle holder is slidably mounted in the longitudinal cavity of the plunger. A biasing arrangement urges the needle holder in a direction for retracting the needle into the barrel. However, a releasable latching arrangement retains the needle holder against the urging of the biasing arrangement in a position wherein the needle projects from the barrel. An In-Barrel assembly sequence is provided which permits sequentially inserting components of the syringe into the barrel and effecting assembly with a push of the plunger. An OTN catheter may also be employed in combination with the syringe assembly.
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Citations
84 Claims
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1. A safety syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel, a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle; a needle holder mounting said needle at a distal end thereof and slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which said needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; a compression spring mounted inside of said barrel and means supporting a distal end portion of said spring against expansion;
said spring urging said needle holder toward its retracted position; anda latch arrangement having a closed position in which said needle holder is latched relative to said barrel to hold said needle holder in its advanced position against the urging of said spring, and an open position in which said needle holder is unlatched relative to said barrel to allow said spring to expand in a proximal direction to move said needle holder to its retracted position;
said latch arrangement including a radially projecting arm on one of said needle holder and said barrel by which the needle holder is directly or indirectly engaged with the barrel, at least when in its closed position. - View Dependent Claims (2, 3, 4, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 32, 63)
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5. A safety syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which a needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; a spring mounted inside said barrel and urging said needle holder toward its retracted position; and a latch having a closed position in which said needle holder is latched to said barrel to hold said needle holder in its advanced position against the urging of said spring, and an open position in which said needle holder is unlatched from said barrel to allow said spring to move said needle holder to its retracted position; wherein said needle holder has a lateral arm which extends radially, and wherein said latch engages said lateral arm of said needle holder when said latch is in its closed position. - View Dependent Claims (9)
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10. A safety syringe assembly comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which a needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; a spring mounted inside said barrel and urging said needle holder toward its retracted position; and a latch having a closed position in which said needle holder is latched to said barrel to hold said needle holder in its advanced position against the urging of said spring, and an open position in which said needle holder is unlatched from said barrel to allow said spring to move said needle holder to its retracted position; wherein said latch comprises a needle holder locking element rotatably mounted on said barrel for rotary movement between a locking position and non-locking position on the barrel.
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22. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger; a latch arrangement for latching and unlatching said needle holder relative to said barrel;
said latch arrangement including a radially projecting arm on one of said needle holder and said barrel by which the needle holder is directly or indirectly engaged with the barrel, at least when latching said needle holder relative to said barrel; anda compression spring located in said barrel in surrounding relation to said needle holder and having a distal end held against expansion so as to expand in a proximal direction for retracting said needle holder in response to unlatching said needle holder by said latching means. - View Dependent Claims (23, 24, 25, 26, 29, 37, 38, 40, 41, 64)
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27. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger; a latch for latching and unlatching said needle holder relative to said barrel; and a spring for retracting said needle holder in response to unlatching said needle holder by said latching means; wherein said needle holder has a lateral arm which extends radially, and wherein said latch releasably engages the lateral arm of said needle holder. - View Dependent Claims (28, 30, 31, 33, 34, 35, 36, 39)
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42. An over-the-needle catheter and syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which a needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; an elastic biasing member mounted inside said barrel and contacting said needle holder for urging said needle holder toward its retracted position; a latch releasably engageable with said needle holder and movable between a closed position in which said needle holder is latched to hold said needle holder in its advanced position against the urging of said biasing means, and an open position in which said needle holder is unlatched to allow said biasing means to move said needle holder to its retracted position; an over-the-needle catheter; and cooperating locking surfaces on said catheter and said syringe releasably securing said catheter to said syringe. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50)
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51. A syringe assembly comprising:
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an elongated, generally cylindrical barrel forming a hollow nozzle located at the distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in the said barrel and forming a longitudinal channel; a needle holder slidably mounted in said longitudinal open channel of the said plunger and having a lateral arm; latching means for latching and unlatching said lateral arm of said needle holder with the needle holder distally advanced relative to the barrel; and elastic means located in said barrel for retracting said needle holder within the barrel in response to the unlatching of the needle holder from said barrel. - View Dependent Claims (52, 53, 54, 55, 65, 73)
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56. A syringe assembly comprising:
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an elongated, generally cylindrical barrel forming a hollow nozzle located at the distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in the said barrel and forming a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of the said plunger and having a lateral arm; latching means for latching and unlatching said lateral arm of said needle holder relative to the barrel; and elastic means located in the proximal end portion of said barrel and responsive to unlatching of the needle holder from said barrel for retracting said needle holder within the barrel. - View Dependent Claims (57, 58, 59, 60, 61, 62, 66)
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67. A syringe assembly, comprising:
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an elongated generally cylindrical barrel forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger; a latch that releasably couples the needle holder with the barrel; and an elastic spring located in a proximal end portion of said barrel for retracting said needle holder within the open channel in response to release of said latch. - View Dependent Claims (68, 69, 70, 71, 72, 74)
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75. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger; guide slot means defining a guide slot extending along a proximal end portion of said barrel for guiding a retracting motion of said needle holder within the barrel in response to a retractile force between the barrel and the needle holder; and latching means on said barrel for latching and unlatching said needle holder at the distal end of said guide slot. - View Dependent Claims (76, 77)
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78. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger and having a lateral arm; means defining a guide slot extending along a proximal end portion of said barrel for engaging said lateral arm of needle holder and guiding said needle holder within the barrel in response to relative movement between the barrel and the needle holder; latching means on said barrel for latching and unlatching said needle holder at a distal end of said guide slot, and comprising a locking tab hingedly joined to said barrel and movable between a locking position in engagement with said lateral arm of said needle holder at said distal end of said guide slot and a non-locking position out of engagement with said lateral arm of said needle holder; and retractable force providing means coupled with said needle holder for applying a force thereto for causing said relative movement between said barrel and said needle holder in a direction for retracting said needle holder within said barrel. - View Dependent Claims (79)
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80. A method of assembling a safety syringe assembly comprising, in sequence:
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providing a barrel, a plunger having a longitudinal open channel, a needle holder which mounts a needle at a distal end thereof, a plunger cap, and a helical coil compression spring; axially inserting a plunger cap and said needle holder with said compression spring thereabout into said barrel; aligning said channel portion of said plunger with said needle holder; axially inserting said plunger into the barrel; and applying longitudinal force on said plunger for causing said plunger to advance into said barrel and cause latching of said needle holder to said barrel and sliding engagement of said needle holder with said plunger channel. - View Dependent Claims (81)
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82. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which a needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; an elastic biasing member mounted inside said barrel and contacting said needle holder for urging said needle holder toward its retracted position; and a latch releasably engageable with said needle holder and movable between a closed position in which said needle holder is latched to hold said needle holder in its advanced position against the urging of said biasing means, and an open position in which said needle holder is unlatched to allow said biasing means to move said needle holder to its retractable position.
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83. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal open channel; a needle holder slidably mounted in said longitudinal open channel of said plunger; retracting means for retracting said needle holder relative to the open channel in response to a retractile force between the barrel and the needle holder; and latching means on said barrel for latching and unlatching said needle holder.
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84. A syringe assembly, comprising:
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an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal open channel; a needle holder slidable mounted in said longitudinal open channel of said plunger and having a lateral arm; a guide slot in said barrel for engaging said lateral arm of needle holder and guiding said needle holder within the barrel in response to relative movement between the barrel and the needle holder; latching means on said barrel for latching and unlatching said needle holder; and retractable force providing means coupled with said needle holder for applying a force thereto for causing said relative movement between said barrel and said needle holder in a direction for retracting said needle holder.
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Specification