Prefilled, vented two-compartment syringe
First Claim
1. A prefilled, vented, readily activated syringe assembly adapted to receive a hypodermic needle comprising:
- a barrel member defining a substantially tubular chamber having a wall portion;
a nozzle portion communicating with said tubular chamber;
a hydrophobic filter element operatively associated with said nozzle portion of said barrel member;
a holder member in sealing arrangement with said nozzle portion and positioned outwardly from said filter element;
means to retain said holder member on said nozzle portion;
passage means defined by said holder element;
a piercing tubular member having a piercing point, slidably positioned in said passage means of said holder member and said piercing point spaced from said filter element;
a first stopper in slidable and sealing engagement in said tubular chamber to provide a compartment for a first flowable medicinal material;
a second stopper adapted to receive a plunger rod in slidable and sealing engagement in said tubular chamber of said barrel member and spaced from said first stopper to provide a compartment for a second flowable medicinal material;
means constructed and arranged in combination with said first and second stoppers and said barrel member to provide upon movement of said first stopper toward said second stopper fluid communication between said compartments for said first and second medicinal materials;
whereby upon movement of said second stopper in the direction of said first stopper, intermixing of said first and second medicinal materials will be effected with emission of air through said filter element;
upon subsequent movement of said piercing tubular member toward said filter with a piercing thereof;
attachment of said hypodermic needle to said piercing tubular member; and
upon further movement of said second stopper toward said first stopper substantially;
all of said medicinal materials will be expelled from said syringe.
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Accused Products
Abstract
A prefilled, readily activated syringe assembly wherein a fluid medicament and a diluent therefor can be intermixed in a syringe barrel with a venting thereof. A medical powder is sealed in a barrel by means of an intermediate slidable stopper and the diluent is sealed in the same barrel between the stopper and a plunger stopper. A bypass channel is provided in the syringe barrel which permits intermixing of the diluent and the medicament when the plunger stopper is moved toward the intermediate stopper. Movement of the plunger stopper inwardly in the barrel is afforded by means of a hydrophobic filter element associated with the nozzle portion. After intermixing of the diluent and the medicament the filter vent is pierced by means of a piercing tubular member to which is attached a hypodermic needle. Continued movement of the plunger stopper will expel the mixed medicament from the syringe.
160 Citations
16 Claims
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1. A prefilled, vented, readily activated syringe assembly adapted to receive a hypodermic needle comprising:
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a barrel member defining a substantially tubular chamber having a wall portion; a nozzle portion communicating with said tubular chamber; a hydrophobic filter element operatively associated with said nozzle portion of said barrel member; a holder member in sealing arrangement with said nozzle portion and positioned outwardly from said filter element; means to retain said holder member on said nozzle portion; passage means defined by said holder element; a piercing tubular member having a piercing point, slidably positioned in said passage means of said holder member and said piercing point spaced from said filter element; a first stopper in slidable and sealing engagement in said tubular chamber to provide a compartment for a first flowable medicinal material; a second stopper adapted to receive a plunger rod in slidable and sealing engagement in said tubular chamber of said barrel member and spaced from said first stopper to provide a compartment for a second flowable medicinal material; means constructed and arranged in combination with said first and second stoppers and said barrel member to provide upon movement of said first stopper toward said second stopper fluid communication between said compartments for said first and second medicinal materials; whereby upon movement of said second stopper in the direction of said first stopper, intermixing of said first and second medicinal materials will be effected with emission of air through said filter element;
upon subsequent movement of said piercing tubular member toward said filter with a piercing thereof;
attachment of said hypodermic needle to said piercing tubular member; and
upon further movement of said second stopper toward said first stopper substantially;
all of said medicinal materials will be expelled from said syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A prefilled, vented, readily activated syringe assembly adapted to receive a hypodermic needle comprising:
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a barrel member defining a substantially tubular chamber having a wall portion with a bypass channel formed in said wall portion; a nozzle portion communicating with said tubular chamber; a hydrophobic filter element in sealing engagement with said nozzle portion of said barrel member; a holder member in sealing engagement with said nozzle portion and positioned outwardly from said filter element; passage means defined by said holder element; a piercing tubular member having a piercing point, slidably positioned in said passage means of said holder member and said piercing point spaced from said filter element; a first stopper in slidable and sealing engagement in said tubular chamber and spaced from said bypass channel opposite said nozzle portion to provide a compartment for a first flowable medicinal material; a second stopper adapted to receive a plunger rod in slidable and sealing engagement in said tubular chamber of said barrel member and spaced from said stopper to provide a compartment for a second flowable medicinal material; whereby upon movement of said second stopper in the direction of said first stopper, said first stopper will move adjacent said bypass channel to thereby permit intermixing of said first and second medicinal materials with emission of air through said filter element;
upon subsequent movement of said piercing tubular member toward said filter with a piercing thereof;
attachment of said hypodermic needle to said piercing tubular member; and
upon further movement of said second stopper toward said first stopper substantially all of said medicinal materials will be expelled from said syringe. - View Dependent Claims (13, 14, 15, 16)
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Specification