Patent ID: 12239495

DETAILED DESCRIPTION OF THE INVENTION

An embodiment of the present application is described hereinafter with reference to the drawings. In the following description, the side of a surgical skin marker at which side a felt ink reservoir (i.e., a writing tip end)3is positioned is referred to as the tip end side, and the side opposite thereto is referred to as the advancing rotary5, which is at a rear end side. Further, the direction heading toward the tip end side is referred to as the frontward direction, and the direction opposite thereto is referred to as the rearward direction. Moreover, in cases in which identical reference numerals are used in different drawings, the identical reference numerals indicate identical structures even if the structures indicated by the reference numerals are not referenced per drawing.

FIG.1illustrates a state in which, at the surgical felt marker of the embodiment of the present application, the felt ink reservoir3that is the tip end of a pen core has been extended from the internal reservoir. As illustrated in the internal view ofFIG.1the felt ink reservoir has, at the tip end side of a shaft cylinder that is cylindrical tube shaped, a tip end reduced-diameter portion whose outer diameter gradually decreases toward the front side, and has a end portion that is attached to the rear end of the shaft cylinder, an advancing rotary5projects out from the end portion and extends forward, and includes a twistable rotating portion that allows advancement of the felt ink reservoir. An opening part is formed at the tip end of the tip end reduced-diameter portion, wherein the felt ink reservoir can be advanced to allow surgical marking of a subject. The reduced diameter portion can be covered with a cap and serves as a protection of the felt ink reservoir as illustrated in the view ofFIG.3.

As illustrated inFIG.1that is internal, cross-sectional view of the surgical skin marker, an ink accommodating felt ink reservoir3, which is tubular and at whose tip end is felt and can be cut and removed for additional use and is housed at the interior of the shaft cylinder of the surgical marking pen. Inner felt that is formed from, for example, wool, viscose, polyester, polypropylene, nylon, or cotton fibers is accommodated at the interior of the ink accommodating felt ink reservoir. The tip end side of the felt ink reservoir is located in the cylindrical accommodating tube which outer diameter is reduced. The felt ink reservoir optionally includes one or more notches4.

A core or internal portion of the surgical marker, which is shaped as a solid cylinder and which includes an internal screw6connected to an advancement track7, and a felt ink reservoir advancing base8, allows advancement of the felt ink reservoir through the end with rotation of the advancing rotary.

The ink composition of the felt ink reservoir can include an aqueous ink composition includes a water soluble solvent in an amount of from 10 mass % to 80 mass %, preferably from 20 mass % to 60 mass %, and more preferably from 30 mass % to 50 mass %. This water soluble solvent is not particularly limited provided that it is an organic solvent having a hydrophobic group and a hydrophilic group in the molecule structure, and an organic compound having two or more, and preferably two or three, hydroxy groups (—OH) within the molecule is preferable. Examples of such an organic compound are glycerin, diethylene glycol, triethylene glycol, propylene glycol, and ethylene glycol. Inclusion of such a water soluble organic solvent improves the affinity of the aqueous ink composition with respect to the inner felt ink reservoir.

Further, it is preferable that a felt ink reservoir at the tip end of the pen core can be cut in order to prevent drying or dirtying due to the adhesion of ink, and once cut can be used for further surgical procedures on the same or a different subject. The subject can be a human or an animal. Further, it is preferable for the aqueous ink composition to have the initial viscosity at shear rates of 1 to 383 s−1 (25° C.) within the range of 2 to 15 mPa·sec, and the surface tension (25° C.) greater than or equal to 30 mN/m.

An end cap2that is substantially shaped as a cylindrical tube is press-fit into and fixed to the end side covering the felt ink reservoir.

A delivery mechanism5is formed by the advancing rotary5. As will be described later, this advancing rotary5causes the felt ink reservoir3to project out from and retract into the opening part. An internal screw6that is placed in the pen core is interposed between a rear end, which is positioned at the rear end edge of the pen core of the tube, and a tip end, which is a step formed at the inner peripheral surface of the tip end reduced-diameter portion of the shaft cylinder. The advancing rotary urges the felt ink reservoir3toward the tip end reduced-diameter portion.

The pen core is formed in the shape of a rod having a circular cross-section. The tip end side of the pen core is the felt ink reservoir3that is formed in a substantially hemispherical shape. The rear end side of the pen core includes the advancing rotary5.

It should be understood that the foregoing description is only illustrative of the invention. Various alternatives and modifications can be devised by those skilled in the art without departing from the invention. Accordingly, the present invention in intended to embrace all such alternatives, modifications and variances that fall within the scope of the appended claims.