Disposable syringe made of plastics, for medical purposes, consisting of a barrel (1), a piston (2) provided with a plunger shaft (3) guided at a distance from the barrel wall, and a closure cap (4), the piston (2) being releasably joined to the plunger shaft (3). The piston (2) is at least partiall
Disposable syringe made of plastics, for medical purposes, consisting of a barrel (1), a piston (2) provided with a plunger shaft (3) guided at a distance from the barrel wall, and a closure cap (4), the piston (2) being releasably joined to the plunger shaft (3). The piston (2) is at least partially softly resilient due to the fact that on the piston periphery wall parts of greatly reduced wall thickness are present. The closure cap (4) contains a sufficiently long, stable slide bearing for the plunger shaft (3), so that deformation of the latter, arising out of off-center application of force in the retracted piston position, and out of the tendency of the relatively thin plunger shaft (3) to bow or buckle, will not be transferred to the piston (2).
대표청구항▼
CM,1. A disposable plastic syringe for medical use, comprising a substantially rigid plastic barrel having a closed end with a taper nozzle to which an injection needle of suitable size can be attached, a piston comprising a single, at least partially soft-elastic component part made of thermoplasti
CM,1. A disposable plastic syringe for medical use, comprising a substantially rigid plastic barrel having a closed end with a taper nozzle to which an injection needle of suitable size can be attached, a piston comprising a single, at least partially soft-elastic component part made of thermoplastic material disposed in direct sealing and sliding engagement with an inner wall surface of the barrel, the other end of the barrel opposite to said closed end being open, a separate closure member closing said open end; said separate closure member comprising a disc-shaped cover plate made of plastic material and having an outer substantially cylindrical ring wall and an inner substantially cylindrical ring wall, each of said ring walls protruding coaxially from said cover plate, said outer ring wall protruding in a direction towards said barrel closed end and being shaped and arranged for a durably secure fastening of said closure member to said barrel in a force-fit tight and locked manner and having a cylindrical external circumferential surface which is in a tight fit with said barrel when said closure member is inserted into said open end of said barrel, an inner wall surface of said barrel, at least one local indentation in said barrel inner wall surace and in said outer ring wall to additionally secure and strengthen the fit between said barrel and said outer ring wall; said inner ring wall protruding both in a direction towards said barrel closed end and in a direction away from said barel closed end and comprising a substantially shape-retentive positive slide guide of axially elongate tubular form, a plastic reciprocable plunger shaft connected to said piston, said plunger shaft having a maximum cross-sectional dimension which is substantially smaller than the inside diameter of said barrel and being slidable in said slide guide, the axial length of said slide guide being at least equal to the largest cross-sectional dimension of the plunger shaft and of a total length sufficient to prevent buckling or bowing of said plunger shaft, said plunger shaft being radially spaced from said barrel inner wall surface, said piston including a substantially hollow bell-shaped rotational body having a piston face and an annular wall-like piston periphery formed on said piston face, a shank portion formed centrally in the piston interior, an annular groove-like recess open rearwardly of said piston face toward said barrel open end and located between said wall-like piston periphery and said shank portion, said piston wall-like periphery having first and second softly resilient wall portions of greatly reduced wall thickness with respect to the remainder of said piston wall thickness, said softly resilient wall portions flaring toward the outer periphery of said piston, and a substantially shape-stable cylindrical wall portion of full wall thickness extending between said said first and second wall portions, an open annular groove extending into the piston body from the piston face and separating said first softly resilient wall portion from the remainder of said piston face, a sloping bevel defined in said wall-like piston periphery to be in said annular groove-like recess, said bevel being located adjacent to said second softly resilient wall portion and extending from the rearmost portion of said piston toward said piston face to said wall portion of full wall thickness and being located between said piston outer periphery and said shank portion.
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이 특허에 인용된 특허 (4)
Barta Helmut (Vienna ATX) Simonich Walter (Vienna ATX), Combined ampule-oneway injection syringe.
Uber, III, Arthur E.; Griffiths, David M.; Reilly, David M.; Hirschman, Alan D.; Cowan, Kevin P.; Trocki, Mark, Systems and methods of delivering a dilated slurry to a patient.
Uber, III, Arthur E; Griffiths, David M; Reilly, David M; Hirschman, Alan D; Cowan, Kevin P; Trocki, Mark, Systems and methods of delivering a dilated slurry to a patient.
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