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Publication numberUS820845 A
Publication typeGrant
Publication dateMay 15, 1906
Filing dateMar 30, 1905
Priority dateMar 30, 1905
Publication numberUS 820845 A, US 820845A, US-A-820845, US820845 A, US820845A
InventorsLyman Guy Barton
Original AssigneeAlbert A Wheelock, Lyman Guy Barton
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Obstetrical forceps.
US 820845 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

N0. 820,845; PATENTED MAY 15, 1906.



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Specification of Letters Patent.

ratented May 15, 1906.

Application filed March 30. 1905, Serial No. 252,857.

To all whom it ntag concern:

Be it known that I, LYMAN GUY BARTON, a citizen of the United States, and a resident of Willsboro, in the county of Essex and State of New York, have invented new and useful Improvements in Obstetrical Forceps, of which the following is a full, clear, and exact description.

My invention relates to obstetrical forceps, and more particularly to those of the axistraction type.

Its principal objects are to provide such an instrument which may be-readily applied to the fetal head and efliciently manipulated to effect delivery.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views. Figure 1 is a perspective view of one em- Fig. 2 is a top Fig. 3 shows in top plan bodiment of my invention. plan view thereof. one of the forcep members separated from its companion. Fig. 4 is a transverse sectional detail on the line 4 4 of Fig. 1. Figs. .5 and 6 are top plan views of the cooperating ends of the blade extensions. Fig. 7 is a sectional detail of the pivotal connection between the members, and Fig. 8 is a similar view of the mounting for the approximating device.

A pair of forcep members are designated by the letters A and B, the former comprising a traction rod or handle portion 10 and a blade portion 11, while the latter has similar elements 12 and 13 respectively. Each handle has a central flattened portion 14, through which is a longitudinal slot 14, that of the blade 10 being formed to secure greater 1ightness of the instrument and being bridged at 15 to support a pivot-pin or projection 16. This pin is rotatable in the bridge, its shank 17 turning in an opening therein and being retained in place by a screw 18, threaded through the side of the portion 14 and entering an annular groove 19 in the shank. The pivot-pin at its outer end is provided with an elongated head 20, the thickness of which is such as to allow it to enter the slot in the companion member and its length being sufficient to hold them against separation when it is turned across the handle. Beyond the portions 14 the handles diverge at 22 to receive the blade portions 11 and 13, which are mounted upon the handles 10 and 12 respectively, for independent rotation. The engaging portions 25 of these blades are preferab y formed with the usual contour to adapt them to the head of the fetus and to the pelvic cavity. Extending from the side of each of the blade portions is a pivot-pin or projection 26, which is rotatable in an opening in the end of the section 22 of each handle and may be held against disengagement by a screw entering a groove, as has been described in connection with the main pivot-pin.

The blades extend inwardly beyond the pivot-pin at 27, where they are provided with connecting means to allow the coordination of their movements. Upon the extension of the blades 11 are separated walls 28 28, which receive between them a tongue 29, projecting from the extension of the blade 13. Between the walls 28 extends a pivot-pin or projection 30, which may engage a recess 31 in the side of the companion extension. When the pin and recess are in cooperation, they may be locked to prevent separation by a member 32, turning about a screw 33, threaded into the end of the pin 30, and having in its under side a transverse slot or recess 34 to receive a pin or projection 35 from the extension of the blade 13, which seats itself in a depression 36, opening from the outer wall of the recess 34. The member 32 may be knurled or corrugated at 37 to facilitate engagement by the fingers of the operator.

At the ends of the handles opposite the blades are grip portions 38, extending therefrom at a suitable angle, and adjacent to these, upon the upper faces of the handles, are posts 39 and 40, which are rotatably mounted in a manner similar to the pivotpins and are bifurcated at their outer extremities. Between the fork of the post 39. is hinged a rod 41, which may enter the fork of the post 40 and is threaded to receive a thumb-nut 42.

In use the forcep members are separated and are independently introduced into the uterus until the end of the blade of each touches the head, by which it will be deflected, and by virtue of its pivotal connection with the handle will glide between said head and the pelvic wall and assume the proper position, the handles at all times maintaining substantially an axial position with relation to the pelvis. When both blades have thus been applied, the pin 16 is caused to enter the groove in the handle of the companion member and its head is turned to secure them. The members may now be moved longitudinally until the recess 34 comes opposite the pin 35, when they may be brought into cooperation and the blade extensions locked by the member 32. The screw 41 is now swung into the bifurcation of the post 40 and its nut turned until the blades are properly approximated. It will be seen that when closed upon the head they may occupy an angular position with relation to the handles, this varying between such limits as are indicated in full and L The '1 dotted lines in Fig. 2 of the drawings. instrument is now ready to apply traction to aid in delivery. With the forceps ordinarily employed, the blade and handle being continuous and not moving independently, application to the fetal head in the medium and high positions cannot be made without disturbing its relation to the proper pelvic diameters, in which it is neccessary to descend, even though the instrument be rotated on its own axis through a considerable angle and the handles markedly depressed against the perineum. As a consequence greater compression force is required to prevent slipping of the blades and greater traction force is required to complete delivery. This entails increased risk to both fetus and maternal tissues. With my improved forceps, however, by means of the'independent action of blades and handles exact application to the head may be made without disturbing its proper relation to the pelvic diameters, the handles remaining in the axis of the interior strait without depression against the perineum. As a consequence the head descends in a proper j attitude, less compression and less traction force being required, and as parturition pro ceeds the handles may be shifted longitudinally upon one another, this causing the blades to rotate together to follow the head, thus'permitting the handles to remain in an axial position and the blades to maintain their fixed relation to the head. The capability of independent movement of the blade upon the handle in application and the simul taneous rotation of the blades during traction especially adapts this instrument for such positions of the fetus as when the longinected to the handle and the blade of the other member. 2. Obstetrical forceps, comprising associated members, each having a handle, and a blade pivoted to the handle, the handle and the blade of one member being pivotally connected to the handle and the blade of the other member, and the handles being movable longitudinally with respect to each other.

3. Obstetrical forceps comprising associated members, each having a handle and a blade portion, said members being pivotally connected and also movable longitudinally of one another 4. Obstetrical forceps comprising cooperating handles, blades pivoted upon the han. dles, and means for simultaneously swinging the blades with respect to the handle through their connections therewith.

5. Obstetrical forceps comprising cooperating handles, blades movable upon the handles, said blades being pivotally connected to one another.

6. Obstetrical forceps comprising a pair of associated members composed of a bla e and a handle pivotally connected, the members being movable longitudinally of each other, and means for constraining the blade portions to move symmetrically.

7. Obstetrical forceps comprising a pair of associated members, one of which has a slot and the other a projection operating in the slot and furnishing a pivotal connection.

8. Obstetrical forceps comprising a pair of associated members, one of which has a slot and the other a projection operating in the slot, said projection being rotatable upon its member and provided with an elongated head.

9. Obstetrical forceps comprising a pair of handles pivoted to one another, and a blade pivoted upon each handle, on an axis perpendicular thereto.

10. Obstetrical forceps comprising a pair of handles pivoted to one another, a blade pivoted upon each handle and being extended inwardly beyond their pivots, and a connection between the blade extensions.

11. Obstetrical forceps comprising a pair of handles pivoted to one another, a blade pivoted upon each handle and being extended inwardly beyond their pivots, one of said blade extensions being provided with a recess and the other with a cooperating pin, and means for lockin the pin within the recess.

12. Obstetrica forceps comprising a pair of handles pivoted to one another, a blade pivoted u on each handle and being'extended inwardly beyond their pivots, one of said blade extensions being provided with a recess and the other with a cooperating pin, a proj ection upon one of the extensions, and a member movably mounted upon the other extension for engagement with the projecj tion.

sweat 13. Obstetrical forceps, comprising inde- In testimony whereof I have signed my endently-movable handles, blades pivoted name to this specification in the presence .of IO to the handles on) an axis per endicuiar there two subscribing witnesses.

to, means where ythe hand es ma e move 7 5 longitudinallywith respect to eacl i other, and LYMAN BARTON me ans whereby the blades may be constrained Witnesses:

to move in definite relation with respect to K. C. BARTON,

each other. A. A. WHEELooK.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4151846 *Nov 17, 1977May 1, 1979Dieter von ZeppelinForceps
US4248233 *Apr 20, 1979Feb 3, 1981Zeppelin Dieter VonForceps
US5139503 *Nov 28, 1990Aug 18, 1992Salas Ceniceros SalvadorObstetrical spatulas
US8939989Apr 20, 2011Jan 27, 2015Alex ObohObstetric forceps
Cooperative ClassificationA61B17/44