Syringe and syringe plungers for use with medical injectors
DCFirst Claim
1. A syringe comprising:
- a body; and
a plunger movably disposed within the body, the plunger comprising;
a cylindrical wall extending in a longitudinal direction and having a circumferentially continuous inner surface and an outer surface, the inner surface defining a retaining shoulder formed in a radial direction and extending along the circumference of the cylindrical wall; and
a plurality of inwardly projecting flanges extending rearwardly from the retaining shoulder and fixedly disposed on the circumferentially continuous inner surface of the cylindrical wall, wherein the plurality of inwardly projecting flanges extending a length in a longitudinal direction and are fixedly connected along the length to the cylindrical wall,wherein the inwardly projecting flanges are continuously supported in the longitudinal direction by the circumferentially continuous inner surface of the cylindrical wall,wherein the outer surface is defined by a wall that is planar in axial and annular directions.
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Accused Products
Abstract
A syringe plunger includes a wall having an inner surface and one or more inwardly projecting flanges disposed on the inner surface of the wall. Preferably, the inner surface of the wall defines a retaining shoulder formed along an axial plane thereof. An injector drive member preferably includes at least one retaining member adapted to engage the retaining shoulder of the syringe plunger to allow the drive member to retract the plunger with the body of the syringe. Further, the drive member preferably includes one or more outwardly extending flange members adapted to be engaged by the inwardly projecting flanges of the syringe plunger. When the syringe body is rotated, the at least one retaining member on the drive member is retracted and disengaged from the retaining shoulder of the syringe plunger.
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Citations
12 Claims
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1. A syringe comprising:
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a body; and a plunger movably disposed within the body, the plunger comprising; a cylindrical wall extending in a longitudinal direction and having a circumferentially continuous inner surface and an outer surface, the inner surface defining a retaining shoulder formed in a radial direction and extending along the circumference of the cylindrical wall; and a plurality of inwardly projecting flanges extending rearwardly from the retaining shoulder and fixedly disposed on the circumferentially continuous inner surface of the cylindrical wall, wherein the plurality of inwardly projecting flanges extending a length in a longitudinal direction and are fixedly connected along the length to the cylindrical wall, wherein the inwardly projecting flanges are continuously supported in the longitudinal direction by the circumferentially continuous inner surface of the cylindrical wall, wherein the outer surface is defined by a wall that is planar in axial and annular directions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fluid injection system comprising:
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an injector comprising; a housing; and a drive member at least partially disposed within the housing, the drive member comprising; at least one retaining member; and
one or more outwardly extending flange members; anda syringe comprising; a body; and a plunger movably disposed within the body, the plunger comprising; a cylindrical wall extending in a radial direction and having a circumferentially continuous inner surface and an outer surface, the inner surface defining a retaining shoulder formed in a radially inward direction and extending along the circumference of the cylindrical wall; and a plurality of inwardly projecting flanges extending rearwardly from the retaining shoulder and fixedly disposed on the circumferentially continuous inner surface of the cylindrical wall, wherein the plurality of inwardly projecting flanges extending a length in a longitudinal direction and are fixedly connected along the length to the cylindrical wall, wherein each of the inwardly projecting flanges are continuously supported in the longitudinal direction by the circumferentially continuous inner surface of the cylindrical wall; wherein the at least one retaining member on the drive member of the injector is adapted to engage the retaining shoulder on the cylindrical plunger wall to enable the drive member to retract the plunger within the body of the syringe; and wherein the plurality of inwardly projecting flanges on the cylindrical plunger wall are adapted to engage the one or more outwardly extending flange members on the drive member when the syringe body is rotated about its longitudinal axis, the one or more outwardly extending flange members operable to cause the at least one retaining member on the drive member to disengage the retaining shoulder on the cylindrical wall of the plunger upon rotation of the syringe body. - View Dependent Claims (8, 9)
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10. A syringe comprising:
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a body; and a plunger movably disposed within the body, the plunger comprising; a cylindrical wall having a continuous inner surface and an outer surface, the inner surface defining a retaining shoulder formed and extending along the circumference of the cylindrical wall; and a plurality of inwardly projecting flanges extending radially from the continuous inner surface and rearwardly from the retaining shoulder, wherein the plurality of inwardly projecting flanges includes a proximal end and a distal end, wherein the distal end connects to the retaining shoulder and the proximal end connects to the cylindrical wall, wherein the outer surface is defined by a wall that is planar in axial and annular directions. - View Dependent Claims (11, 12)
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Specification