Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2000-01-31
2001-03-06
Yasko, John D. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S195000
Reexamination Certificate
active
06196997
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disposable syringe mainly used in medical treatment.
2. Description of the Prior Art
A syringe needle of the syringe after use is attached with patient's blood and the like containing pathogenic bacteria etc. When the syringe needle attached with blood or the like is reused, there is a possibility of triggering a secondary infection. To prevent such a secondary infection, a number of disposable syringes are used. As the disposable syringe, for example, like the syringe as disclosed in Japanese Patent Laid-Open No. 31681/1995 (hereinafter referred to as “a conventional syringe”), a syringe (a lead-in type syringe needle) of the system is generally known where the syringe needle attached with blood or the like after use is inserted into a syringe body of the syringe and discarded after kept in a state of being untouchable from outside.
The conventional syringe comprises; a syringe body; a piston sliderably inserted from one end of the syringe body; a smaller-diameter portion formed at the other end in the opposite direction of one end of the syringe body; a needle support detachably supported by the smaller-diameter portion; a syringe needle supported by the needle support; a stopper formed in a tip of the smaller-diameter portion for preventing the needle support from slipping off in the other end direction of the syringe body; an locking projection from a tip of the axis center direction of the piston; and a locking hole disposed on a syringe side of the needle support for engaging with said locking projection when the piston is pressed in, and wherein, after the locking projection is inserted into and engaged with the locking hole by pressing in the piston, the syringe needle with the needle support is pulled into the syringe and stored there by pulling out the piston.
the conventional syringe is widely used even today in medical field and the like. However, the inventor was not satisfied with it and continued to engage in research work by seeking for a method of improving usable facility. What the inventor aimed at is whether removal of the needle support from the syringe body could be made more smoother than before. To make removal of the needle support smooth, a locking structure with the needle support and the syringe body may be made into a structure easy to disengage. This is because, if the structure is easy to disengage, a tensile force at the time when the needle support is pulled into the syringe body together the syringe needle may be to be weak.
However, if the structure easy to disengage is adapted, a trouble tends to arise where a sealability between the needle support and the syringe body is lost and parenteral solution leaks out from the syringe body. This is particularly true of a syringe of the system where the syringe needle is used with the needle support is attached. That is, since a compressive force at the time when the syringe needle is attached acts upon this locking structure, the locking structure can not be extremely weak no matter how smooth drawing out should be made. To satisfy at once a conflicting demand for both making drawing out (removal) smooth and sufficiently keeping sealability in high level is the object to be solved of the present invention.
DISCLOSURE OF THE INVENTION
To solve the above mentioned object, the locking structure is required to be such that it works strongly when an injection is executed actually or works weakly or does not work at all when the needle support is drawn out from the syringe body. The inventions as mentioned in respective claims are made from this view and detailed contents thereof will be described again in separate paragraphs to follow.
The 1st invention comprises; a cylindrical syringe body; a piston sliderably inserted (frequently insertable) from one end (an end of the other end) of the syringe body; a smaller-diameter portion having an inside-diameter smaller than an inside-diameter of the syringe body and formed at the other end (an end in the opposite direction of the one end) of the syringe body; a needle support detachably (attachably and detachably) supported by the smaller-diameter portion; a syringe needle supported by the needle support; a pass-through hole formed in the needle support for communicating with the flow passage of the syringe needle and the inside of the syringe body; a stopper formed on a tip portion of the smaller-diameter portion for preventing the needle support for slipping off in the other end direction (in the direction where the syringe needle is available) of the syringe body; a locking projection projected from a tip of an axis center direction of the piston (toward the direction where the needle support is available); and a locking hole disposed on the piston side of the needle support for engaging with the locking projection when the piston is pressed in, and wherein a structure of the syringe is basically the same with the conventional syringe in that the syringe needle, after the locking projection is inserted into and engaged with the locking hole by pressing in the piston, is pulled into the inside of the syringe body and stored there by pulling out the piston. No restriction is imposed on the shape of the needle support. The syringe needle and the needle support may be united or separated. The reason why an inner diameter of the smaller-diameter portion is made smaller than the inner diameter of the syringe body is to make an outer peripheral face of the needle support to be drawn out so as not to contact with an inner peripheral face of the syringe body. That is, if the inner diameter of the syringe body is equal to the inner diameter of the smaller-diameter portion, the outer peripheral face of the needle support has to slide along, that is, has to be drawn out, while contacting with the inner peripheral face of the syringe body. To prevent such a contact, the inner diameter is made smaller.
A structural characteristic of the 1st invention is such that the locking structure for preventing the needle support from slipping off in one end direction of the syringe body is provided between the inner peripheral face of the smaller-diameter portion and the outer peripheral face of the needle support; a seal structure is formed for preventing liquid leak in a locking portion of the locking structure; and the locking projection and the locking hole are formed in the shape where the engagement of the locking structure is disengaged and the needle support is deformed to expand the inner peripheral face of the smaller-diameter portion in the radial direction when the locking projection is inserted into and engaged with the locking hole. The shape of “the locking projection” and “the locking hole” may be of any shape if the engagement of the locking structure can be disengaged through the syringe support.
The 1st invention basically generates the same action effect with the conventional syringe such that after injection the piston is further pressed in and the locking projection is inserted into and engaged with the locking hole and then the piston is drawn out and the needle support can be pulled into the inside of the syringe body with the syringe needle and stored there. A support of the needle support by the smaller-diameter portion is executed by making the needle support pressurized from the syringe body side and climbed over the locking structure. The needle support once supported can not be slipped out of the smaller-diameter portion owing to the stopper and the locking structure. The stopper acts when the piston is pressed in and the locking structure acts when, for example, the syringe needle is attached. The seal structure prevents parenteral solution injected into the syringe body from leaking outside. When the locking projection is inserted into and engaged with the locking hole, the needle support is deformed to expand the inner peripheral face of the smaller-diameter portion in the radial direction, thereby disengaging the engagement of the locking structure. Since
Eckert Seamans Cherin & Mellott , LLC
Yasko John D.
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