Automatic injection device
First Claim
1. A syringe plunger formed of a polymeric material, the syringe plunger comprising:
- a pressurizer disposed at a proximal end; and
a distal end bifurcated into a first plunger arm having a first conical surface and a second conical surface, and a second plunger arm having a first conical surface and a second conical surface, the distal end including;
a first contact surface defined by the first conical surface of the first plunger arm and the first conical surface of the second plunger arm, the first contact surface configured to initially contact a firing engagement mechanism, the first contact surface disposed at a first angle of between about 40° and
about 80°
relative to a longitudinal axis of the syringe plunger, anda second contact surface defined by the second conical surface of the first plunger arm and the second conical surface of the second plunger arm, the second contact surface configured to contact the firing engagement mechanism subsequent to contact by the first contact surface.
3 Assignments
0 Petitions
Accused Products
Abstract
Exemplary embodiments provide a syringe plunger formed of a polymeric material. The syringe plunger includes a pressurizer disposed at a proximal end, and a distal end bifurcated into a first plunger arm having a first conical surface and a second conical surface, and a second plunger arm having a first conical surface and a second conical surface. The distal end includes a first contact surface defined by the first conical surface of the first plunger arm and the first conical surface of the second plunger arm, the first contact surface configured to initially contact a firing engagement mechanism, the first contact surface disposed at a first angle of between about 40° and about 80° relative to a longitudinal axis of the syringe plunger. The distal end also includes a second contact surface defined by the second conical surface of the first plunger arm and the second conical surface of the second plunger arm, the second contact surface configured to contact the firing engagement mechanism subsequent to contact by the first contact surface.
408 Citations
56 Claims
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1. A syringe plunger formed of a polymeric material, the syringe plunger comprising:
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a pressurizer disposed at a proximal end; and a distal end bifurcated into a first plunger arm having a first conical surface and a second conical surface, and a second plunger arm having a first conical surface and a second conical surface, the distal end including; a first contact surface defined by the first conical surface of the first plunger arm and the first conical surface of the second plunger arm, the first contact surface configured to initially contact a firing engagement mechanism, the first contact surface disposed at a first angle of between about 40° and
about 80°
relative to a longitudinal axis of the syringe plunger, anda second contact surface defined by the second conical surface of the first plunger arm and the second conical surface of the second plunger arm, the second contact surface configured to contact the firing engagement mechanism subsequent to contact by the first contact surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An automatic injection device, comprising:
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a syringe including a syringe barrel for holding a substance; and a syringe plunger formed of a polymeric material, the syringe plunger including; a pressurizer disposed at a proximal end; and a distal end bifurcated into a first plunger arm having a first conical surface and a second conical surface, and a second plunger arm having a first conical surface and a second conical surface, the distal end including; a first contact surface defined by the first conical surface of the first plunger arm and the first conical surface of the second plunger arm, the first contact surface configured to initially contact a firing engagement mechanism, the first contact surface disposed at a first angle of between about 40° and
about 80°
relative to a longitudinal axis of the syringe plunger, anda second contact surface defined by the second conical surface of the first plunger arm and the second conical surface of the second plunger arm, the second contact surface configured to contact the firing engagement mechanism subsequent to contact by the first contact surface. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of forming a syringe plunger for an automatic injection device, the method comprising:
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forming a distal end of the syringe plunger, the distal end bifurcated into a first plunger arm having a first conical surface and a second conical surface, and a second plunger arm having a first conical surface and a second conical surface; forming a first contact surface with the first conical surface of the first plunger arm and the first conical surface of the second plunger arm, the first contact surface configured to initially contact a firing engagement mechanism of the automatic injection device, the first contact surface disposed at a first angle of between about 40° and
about 80°
with respect to a longitudinal axis of the syringe plunger;forming a second contact surface with the second conical surface of the first plunger arm and the second conical surface of the second plunger arm, the second contact surface configured to contact the firing engagement mechanism subsequent to contact by the first contact surface; forming a proximal end of the syringe plunger; and forming an intermediate portion of the syringe plunger between the distal end and the proximal end. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification