US1573681A - Trocar - Google Patents

Description

Feb. 16 1926.

J. a. DAIREAUX TROCAR Filed Jun 18, 1924 A THOR/ 576 Falented Feb. 16,1925.

:j UNITED STAT JORGE ease IDAIBEAUX', or BUENOS Aims, A GENTINA.

' anocnn.

' Application filed a'une 18, 1924; Seria1 "No L'72t)',803i

To all whom it'mey concern;-

I Be it known that I, JoReE GAso DAIREAUX,

a citizen of the Republic of Argentina, re siding at Maipu 671, Buenos Aire'afArgentina, have invented a new and useful Trocar, of which the following is a specification.

This invention is for a new veterinary apparatus for the exclusive purpose of operatapparatus, known astrocars,

ing on food bound animals. As is well known, except n i'ery rare cases, bound animals almost invariably die if intervention be not taken without delay and an opening made in the stomach allowing of the escape of the gases and matter which produce ;the swelling, the characteristic symptoms of this illness. .At present tins operation is effected by means ofspecial or simply by means of knives. V g

Although the above means may result in saving the animals, they 'both otter serious deficiencies.

apparatus in case several 'animalsare efi'ected at the same time, as the'tube has, to be loft in the wound. Again," when the tube has been inserted it isv very prone to become blocked by the matter drawn 011', and this means that the operator has to"maintain a constant watch in order to clear the tube each time it gets stopped up. otherwise the apparatus would be ineffective. The skin contracts as the swelling gees down,

V and the tube remains tightly gripped, thus Operations practised with knives cause, of necesslty, large wounds, since the-tenslon of the skin tends to close 'up' the wound.

Iherefore, as is easily understoocLit takesa I long time to. heal, leaving the animal in a weak state and exposed to risk of infections."

ing a kind of hinged flap, which later isusedas a covering to aid the closing-of the wound after the swelling has subsided. Obviously when the incision is iirst made .tllB tension of the swelled body draws the incision open and holds it open. and this continues until the swelling subsides. With tins instrument a large number oi animals As regards the first,it is necessary to keep on hand a number of these giving rise to tears 1n the -wound, which makes it difiicult to healwhen the" tube is withdrawn.

can be'operated on very rapidly, without need for accessory parts, andthe punctures practised do not get blocked up. nor do they require any attention whatsoever during the evacuation the wound healing very rapidly as soon as this ceases and allows the contraction of the skin.

For the betterunderst'anding of scription the following detailed drawings are attached Figure 1, showing in perspective an instrument for making punctures in foodhound animals. 7 v Figure 2, showing same in plan view.

Figure 3, showing the form of the incision in the skin. I

In these figures the part numbered 1, is

- the cutting part of the instrument, which is Iormed of a, steel tube that'may be opened 7 this de along its length or not, and the end of this is cut off obliquely, the edge of this oblique out being sharpened all round,the section thus being as shown'in Fig. 2,: 1t may be made in the form of a complete circle, pro vided that the sector below 1 is left'unsharpcncd, or that it has aprojection to prevent 7 that portion from cutting and also to act as a stop,

thus avoiding a deeper penetration than necessary. In thisway the'apparatus, independent of a handle, may be formed of a simpletube cut off in theYm-anner described. g 7

The drawmg only shows one of many ways in which the cutting instrument can be mounted.

In the present case the stop is i'ormed'by the end washer, numbered 2, which is fixed Y 011 the handle, numbered 3, holding the cutting part. 5 g As is shown in Figure 3 the incision made by the instrument isa semi-circular one.' Due to this special form" of incision the part A does not oppose any resistance to the internal pressure and allows the free escape of the gases and matter; When] the skin Lonlracts, the perforation shrinks and the centre part of thesemi-circle closes it up, thus aiding in a speedy healing. [The character of this invention and the way in which it is put into practice having thus beendescribed and specified, I claim as being my exclusive invention and property: c j An instrument for making punctures in bound animals, comprising a handle ro- Ill) ing a Hat face at right angles to the 1ongi edges extending throughout their length, Ludinal axis of the handle, and a cutting whereby the flat face of the enlargement 0t 10 blade secured thereto projecting centrally the handle forms a stop to limitche punclroni the face of the enlargement and in ture and provision is made for making a line With the handle, said blade being curved incision Which is greater than a semicurved transversely and having its edges circle and facilitates closing of the Wound. gradually inclined to form a pointed end,'

said edges being sharpened t0 fOI'EI-l cutting v JORGE GASC DAIREAUX.

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