US 1707298 A
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April 2, 1929. P. s. CORLEO 1,707,298
ADJUSTABLE OBSTETRIC FORCEPS Filed Dec. 10, 1926 INVENTOR PIETRO SIRENA coeuzo ATTOE NEY Patented Apr. 2, 1929.
UNITED STATES I trials PATENT FFMIE;
PIETRO SIBENA GORLEO, 0F PALERMO, ITALY.
ADJUSTABLE OBSTETRIG FORGEPS.
1 Applieationfiled neeeruber 10,1926, SeriaI No. 153,890, and. in Italy October F37, 1923.
The subject of the present invention is an improved adjustable obstetric forceps with alternately arranged yiehling lades, Which is illustrated by Way of example in the accompanying drawing, in which 2- r a Figure 1 shows the forceps in the closed position, and
Figure 2 shows the same in the open position, with outsprea d handles and blades, each of Which comprises a divided elastically yielding blade (as in the case in, which the instrumentapplird in a vertex presentation with occipito-frontal grip).
The forceps forming the subject of the present invention obviates the known disadvantages attaching to the various types of Torceps at present in use,such disadvantages being due to compre sive action.
ldaid action is minimized by means of a suitable shaping of the blades the shanks of which are made parallel to each other only in one part, according to the English method of articulation (Figure 2) differing from other types of forceps heretofore described. but hinged according to the Gern'ian method.
As can be seen from Figure 2, the left rear blade member and the front right blade member g are provided with a longitudinal recess which s-ierves as a lodgment for the respective left front blade member g and right rear blade member g This arrangement facilitates the sliding of the locking collars f and f which engage respectively with the blade members 9 F and o r t, and the locking of the blade member g as in the known forceps. The collars f and are slid over the shanks of the blades With the greatest ease inasmuch the blade members are in the same plane.
Figure 1 indicates, by the dotted lines the positions 7 and assumed by the locking collars f and 7 when moved away from the pin a in order to lock the blade members 9 and 9 whilst in Figure 2 the said locking means situated in the vicinity of the pivotal point in order to leave the divided blades free to yield.
In Figure the blade-members g and g are in the position corresponding to the act of pressing on the head. and have yielded to an extent corresponding to the oblique left diameter.
in the action of compression the forceps adapts itself to the presented part, the head i becomes fixed so as to prevent any increase of the antero-posterior diameter, and thus use, Which is in turn facilitates a corresponding; increase cl of the right oblique diameter, which increase is more favorable for overcoming the obstacle of thebrim of the pelvis, through coinciding With the right oblique .liameter of the pelvis. p i
During the operation of extraction and only in the moment When the n'e entod part is to pass from the brim to the Wale portion of the cavity of the pelvis, the operator ni by drawing down the collars f and j role the yielding blade members 5 and (f sons to pass by the obstacle. Afterwards, by pushbelrompleted as with solid forceps.
The instrument according to the present design, possesses the characteristic of being provided with divided blades With the corre sponding sliding collars on the shanks, these latter have the same character as those of ordinary forceps.
The forceps now described exerts a minimum of compression on the part presented, thereby reducing the mortality among the newly born. The use of this forceps enables intervention to take place in cases of con .tracted pelvis of a moderate degree, with a notable reduction in the number of more sorious and complicated operative processes.
Clinical tests have demonstratei'l that the fenestrated blade members of the forceps may be divided alternately Without lowering the resistance of the instrument to the action of gripping and traction, on the contrary it is of advantage in the rotary action that the alternate discontinuity of the blades trans forms the forceps from rigid to flexible grip, With the result that the compressive action of the instrument is considerably lessened, the instrument being no longer subjected to the classic leverage action produced by the compression of the handles; and finally that said reduction in the compressive action, attains the maximum with the blades yielding (5 kg), is also considerable when the blades are locked (7 kg.) and therefore the application of the said instrument with the loclring collars raised as an ordinary forceps signifies an important advantage over the compressive action of the instruments hitherto in not less than 18 kg.
1. An improved obstetric forceps comprising pivotally connected blades, each blade being divided so as to provide a yielding portion and a relatively unyielding portion, a
.ing' the collars up agaim the operation may f recess in'the relatively unyielding portion of each blade, and movable locking collars f adapted to lock each yielding portion-to its respective unyielding portion.
2. An improved obstetric forceps comprising pivotally connected blades, divided so as to present a yielding portion and a relatively unyielding portion, part of the shanks of the unyielding portions of the blades being parallel, a recess provided in each said parallel part of the shank, and movable locking collars adapted to lock each yielding portion to its respective unyielding portion in the recess of said unyielding portion.
' 3. An improved obstetric forceps comprising' pivoted handles, having 'fe'nestrae, said ,fenestrae having divided shanksat the bottom 4:. An improved obstetric forceps comprising pivoted handles having fenestrae, mounted thereon, said fenestrae having divided shanks at the bottom thereof, the front shank of one fenestra and the rear shank of the other being made integral with said pivoted handles and having movable locking collars slidable thereon engaging said divided shanks.
5. An improved obstetric forceps comprising pivoted handles having fenestrae mounted thereon, said fenestrae having divided shanks at the bottom thereof, the front shank of one fenestra and the rear shank of the other being made integral with said pivoted handles and having movable locking collars slidable thereon engaging said divided shanks, and recesses provided in said shanks integral with said pivoted handles, the two divided shanks being adapted to be secured in said recesses by the said movable locking collars.
PIETRO SIRENA CORLEO.