US564581A - Trocar - Google Patents

Description

(No Model.)

S.`B.BAKBR.

TROOAR.

No. 564.581- Patented July 28,-1896.'

UNITED STATES- PATENT OFFICE.

SOIPIO E. BAKER, OF SPRINGFIELD, OHIO.

TROCAR.

SPECIFICATION forming part of Letters Patent No. 564,581, dated July 28, 1896.

Appnmion ined Marchas, 1896;

Serial No. 585,174. (No model.)

To a/ZZ whom it may concern:

Be it known that I, ScIPIo E. BAKER, a citizen of the United States,residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Trocars, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in trocars.

The objects of my invention are (a) to so construct the tip of my trocar that it may be readily inserted into the flesh and removed therefrom without tearing the flesh and without being deflected from the line in which it is inserted, and (b) to prevent the passage in the trocar from becoming clogged.

In the accompanying drawings, on which like reference-letters indicate corresponding parts, Figure l is a perspective view of my improved trocar entire; Fig. 2, a longitudinal sectional view of the same; Fig. 3, a detail perspective view of the trocar point, and Fig. 4 a sectional view'on the line a; of Fig. 3.

The letter A represents a vulcanized rubber tube which snugly incases a metallic tubular core or lining B, formed of brass orv other suitable metal. The lower end of this metallic tube or core is preferably screwthreaded, as shown in section in Fig. 2. Upon the screw-threaded end of this core is screwed an arrow or spear tip O, made of highly-teinpered steel or other suitable metal. This tip has two diverging cutting-edges d and b. From these edges and the point of the tip the metal gradually thickens until it becomes the same in diameter as the body of the trocar, thus forming a raised portion on each side of the tip, and which is greatest along a central line c and d, midway between the cuttingedges. The cutting-edges are tapered out until they extend considerably beyond the body of the instrument, and then they taper back. in a slightly-curved line preferably not wider than the body itself. Thus no matter whether the trocar is inserted into the flesh or withdrawn therefrom there is no possibility of tearing the flesh, as there are no irregularities to come in contact with it. Then again by thickening my tip in the manner shown from either side ofthe cutting-edges to the center, as also from the point of the tip along these lines, (shown at c d,) the tip is stiffened and consequently will not be deflected from the line in which it is inserted when the flesh or viscera is pierced, as is the case where a simple cutting-blade is used. It will also be seen that a hole D extends through the tip. This hole connects with a passage E, drilled or otherwise formed in the upper portion of the tip. A part of this passage is preferably screw-threaded, as shown at F, to screw onto the lower end of the tubular core B. When this tip is screwed into place, it snugly fits against the rubber tube A, and the tip being the same size eXteriorly as the tube, a smooth joint is formed. It will also be understood that the tip may be soldered or otherwise secured to the core B instead of being screwed thereon. In somecases also the tip and body of the trocar may be formed of one solid piece of metal. When this is the case, no inner tubular core is necessary.

In order to prevent the hole or opening D in the tip from becoming filled or clogged when inserted into the body of a person, and for cleaning the core, I provide a plunger G, which fits the core and is long enough to extend into the tip and close the opening therein.

In using my trocar it is inserted into the flesh or viscera to the position desired, such as into the heart or other organs, for embalming purposes. The plunger is removed and a pump or aspirator connected to its outer end by a rubber tube or other suitable means. The trocar is then turned about one-fourth of a revolution, which spreads the flesh away from the hole on each side of the tip and allows the blood or gases to be freely drawn out, and also allows the embalming fluid to be readily pumped into the body.

With all of the trocars now on the market the openings become easily closed and require much time in keeping them open, so that the blood may be removed or the embalming fluid pumped in. This difficulty I have overcome by my improved construction.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a trocar, a tip consisting of a fiat pointed portion and a tubular portion, and having. a transverse opening in the flat 'por- IOO provided with diverging euttingedges, a transverse Opening and an interior cavity, whereby the tip is widened to hold the flesh away from the opening by partially rotating the troear, and whereby communication is established from the interior of the orifice to the interior of the incision.

In testimony whereof I aiix my signature in presence of two Witnesses.

SCIPIO E. BAKER. Ttnesses EDWIN L. ARTHUR, W. M. MCNAIR.

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