Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
1999-10-05
2001-12-04
Nguyen, Anhtuan T. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S164080, C604S164120
Reexamination Certificate
active
06325781
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a puncturing device for an indwelling needle which provides for the prevention of health care workers from catching viruliferous infections such as AIDS, HIV or the like due to needlestick injuries from injectors.
(2) Description of the Related Art
In conventionally hospitals and other medical fields, the current main trend is to instruct medical workers not to recap the needle. Because of many needlestick injuries have occurred when a used injector is recapped. However, medical treatments such as blood collection, intravenous administration of medicament etc., are done, instead of treatment rooms, clinics and the like, at bed sites in sickrooms where equipment for collecting needles and injectors is not always provided for. In these cases, an optimal method for avoiding needlestick injuries is to recap the needle. No other devices which offer a worthwhile advantage for their adoption have been developed.
In a conventional indwelling needle which has an inner and outer needle, they are usually joined fast in order to avoid easy removal. Therefore, it is necessary to pull out the inner needle whilst appropriately pressing the outer needle after vain puncture or the like. So, this conventional configuration has the risk of an unskilled worker accidentally and erroneously pulling out the outer altogether with the inner needle from the vein or at least has the problem of producing strain on the vein, thus a solution has been needed. Further, it is necessary to proceed cautiously when the needle is placed into a weak thin vein of a child or the like. Specifically, there is a risk of the opposing wall of the lumen of the vein being damaged if the puncture is too deep. On the other hand, there is another problem in that a too shallow puncture cannot place the outer needle correctly even though the inner needle has punctured the vein.
SUMMARY OF THE INVENTION
The present invention relates to a device which allows health care workers to perform instant and safe disposal of the inner needle made up of a metallic injection needle etc., at once after use of an indwelling needle.
It is therefore an object of the invention to provide a puncturing device which protects health care workers from needlestick injuries from the needle (the inner needle made up of metal) after use.
It is another object of the invention to provide a puncturing device in which an indwelling needle can be fastened without any instability to reduce the burden on the human body during usage and which can prevent the needle from accidentally projecting out as well as preventing the re-use of the needle after it has been used once.
It is still another object of the invention to provide a puncturing device which is readily assembled and inexpensive and can be safely and correctly placed into a weak thin vein of a child etc.
In order to achieve the above objects, the present invention is configured as follows:
In accordance with the first aspect of the invention, a medical puncturing device for an indwelling needle, includes:
an indwelling needle composed of an indwelling outer needle element of a soft synthetic resin capillary tube and a puncturing inner needle element of a metallic capillary tube fitted through the outer needle element;
an outer sleeve for incorporating the indwelling needle and having a guide slot cut along the axial direction on the peripheral surface thereof;
an actuator disposed at the rear end of the indwelling needle and having a projected actuator part fitted through the guide slot; and
a spring interposed between the rear end of actuator and the rear end of the outer sleeve for urging the indwelling needle to the retracted position inside the outer sleeve, and is characterized in that the indwelling needle can move in and out through the opening of the outer sleeve by the actuation of the actuator; and the guide slot further has an engagement window formed continuous from the proximity of the front end thereof forming an L-shape configuration; and the indwelling needle is kept in the projected state with respect to the outer sleeve when the actuator is moved forward and the projected actuator part formed on the actuator is turned so as to be engaged with the engagement window.
In accordance with the second aspect of the invention, a puncturing device for an indwelling needle composed of an indwelling outer needle element of a soft synthetic resin capillary tube and a puncturing inner needle of a hard capillary tube fitted through the outer needle element, includes:
the outer needle element disposed at the front end of the outer sleeve;
the inner needle fitted through the outer needle element;
an actuator integrally formed at the rear end of the inner needle and arranged inside the outer sleeve and the actuator having a projected actuator part; and
an outer sleeve having a guide slot cut along the axial direction on the peripheral surface thereof and an engagement window formed continuous from the proximity of the front end thereof forming an L-shape configuration, the projected actuator part being fitted through the guide slot, and is characterized in that the tip of the inner needle is kept in the projected state from the tip of the outer needle element when the projected actuator part is engaged with the engagement window.
In accordance with the third aspect of the invention, the puncturing device having the above first or second aspect is characterized in that the actuator part is turned and slidably fitted into the engagement window so as to be engaged therein and in the engaged state, one end of the actuator part is mated with one end of the engagement window forming a disengageable engagement which prevents easy removal of the actuator part from the engagement window.
In accordance with the fourth aspect of the invention, the puncturing device having the above first or second aspect is characterized in that the outer sleeve has front and rear engagement windows in L-shaped configurations, one continuous from the proximity of the front end thereof and the other continuous from the proximity of the rear end thereof, and the actuator part is slidably fitted into each engagement window and engaged therein as the actuator part is turned.
In accordance with the fifth aspect of the invention, the puncturing device having the above first or second aspect is characterized in that when the projected actuator part is turned and engaged with the engagement window, abutment portions formed on the inner periphery of the outer sleeve and on the outer periphery of the actuator engage with each other so as to secure the actuator relative to the outer sleeve to thereby fix the indwelling needle without instability.
In accordance with the sixth aspect of the invention, the puncturing device having the above fourth aspect is characterized in that when the actuator part is engaged with the rear engagement window, an engaging portion formed at one end of the rear engagement window engages the actuator part so as to prohibit the actuator part from disengaging from the engagement window.
In accordance with the seventh aspect of the invention, the puncturing device having the above second aspect is characterized in that a spring urging the inner needle to the retracted position inside the outer sleeve is provided between the rear end of actuator and the rear end of the outer sleeve.
In accordance with the eighth aspect of the invention, the puncturing device having the above first or seventh aspect is characterized in that the spring which exerts twisting force on the actuator so that the actuator turns in the rotational direction is provided between the rear end of actuator and the rear end of the outer sleeve, and the actuator is automatically fitted and engaged into the rear engagement window due to the twisting force of the spring when the actuator moves back to the retracted position.
In accordance with the ninth aspect of the invention, the puncturing device having the above second aspect, further includes a rotation stop
Suzuki Hitoshi
Takagi Hiroshi
Takemae Kentaro
Darby & Darby
Mitsubishi Pencil Kabushiki Kaisha
Nguyen Anhtuan T.
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