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Publication Number
US-12370323-B2
Publication Date
2025-07-29
Expiration Date
Abstract
An injection device includes a syringe including a body having an opening, a conversion portion, a button, and a slider. The button includes a pair of leg portions disposed so as to straddle the conversion portion and having front slopes inclined with respect to a tip direction by a set angle. The conversion portion includes a pair of engaging portions connected to a rear end portion of a gasket and having rear slopes that slidingly contact the front slopes of the leg portions. The slider moves the conversion portion and button in the tip direction. The conversion portion moves in the tip direction along with the gasket in accordance with an operation of pushing down the button toward the inside of the body. An injection unit includes the injection device and one or more adjustment members configured to adjust the frontmost position of the button in the opening.
Core Innovation
An injection device includes a syringe having a tubular body with a peripheral wall that has a rectangular-shape opening in a plan view, the opening extending from an outer surface to an inner surface of the peripheral wall. A conversion portion is connected to a rear end portion of a gasket disposed on a tip side of the body and is contained in the body, and a button is disposed on the conversion portion and is supported by the conversion portion such that side portions of the button are sandwiched between both side walls of the opening.
A slider is disposed in the opening in the peripheral wall and interfaces with the outer surface of the peripheral wall, and is configured to move the conversion portion and the button in a tip direction that is a direction in which the gasket moves toward a tip of the body. The button has a cross-sectional U-shape on a plane perpendicular to the tip direction and includes a pair of leg portions disposed so as to straddle the conversion portion, with front slopes inclined with respect to the tip direction by a set angle, and the conversion portion includes a pair of engaging portions with rear slopes that slidingly contact the front slopes and move in the tip direction in accordance with pushing down the button toward inside of the body.
The slider includes a safety protrusion disposed on a side near the button, and the safety protrusion is formed such that a tip surface is flush with the rear end surface of the button when the button is disposed in a frontmost position in the opening and the slider is disposed in a rearmost position in the opening. The button has a pinching groove formed along the tip direction from a rear end surface of the button, and the slider further includes a first slider disposed on a side near the button and a second slider disposed on a side near a rear wall of the opening, where the first and second sliders are movable independently from one another.
Claims Coverage
The disclosed subject matter includes one independent claim with a dependent claim that further specifies an injection unit configuration. The inventive coverage centers on a mechanical coupling that converts a push-down of a U-shaped button into tip-direction movement of a gasket via angled engaging surfaces, with safety interlock geometry using a safety protrusion interacting with a pinching groove and a communication hole, and independent first/second sliders; the dependent claim adds stepwise adjustment of a frontmost position using spacers with a preset width.
Rectangular-opening conversion of button to tip-direction gasket movement
An injection device where a syringe with a tubular body has a peripheral-wall rectangular opening, a conversion portion connected to a rear end portion of a gasket is contained in the body, a button is supported on the conversion portion with side portions sandwiched between both side walls of the opening, and a slider in the opening moves the conversion portion and the button in a tip direction so that the gasket moves toward a tip of the body.
U-shaped button with angled front slopes and engaging portions with sliding rear slopes
The button has a cross-sectional U-shape on a plane perpendicular to the tip direction with a pair of leg portions straddling the conversion portion and front slopes inclined with respect to the tip direction by a set angle, and the conversion portion includes a pair of engaging portions with rear slopes that slidingly contact the front slopes and move in the tip direction in accordance with an operation of pushing down the button toward inside of the body.
Safety protrusion flush condition with frontmost and rearmost positioning
The slider includes a safety protrusion disposed on a side near the button, formed such that a tip surface thereof is flush with the rear end surface of the button when the button is disposed in a frontmost position in the opening and the slider is disposed in a rearmost position in the opening.
Independently movable first and second sliders
The slider includes a first slider disposed on a side near the button and a second slider disposed on a side near a rear wall of the opening, where the first and second sliders are movable independently from one another.
The claims primarily cover an injection device in which a slider drives tip-direction gasket movement through a conversion portion and a U-shaped button with angled front slopes and corresponding engaging portions with sliding rear slopes, while a safety protrusion and pinching groove/communication hole arrangement constrain actuation based on frontmost and rearmost positioning. Independent first/second slider structures support the safety interaction, and a dependent injection unit further adds frontmost-position adjustment using adjustment members including spacers with a preset width.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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