US 3171408 A
Description (OCR text may contain errors)
Mar h 1965 R. P. CHILDS ET AL ORTHOPEDIC PIN GUIDING DEVICE Filed March 29, 1963 Fical FlC-S.7
5 Q5 o mufvE T cL vlzmfi mo m 0 l m DQKAY B ATTORNEY 3,171,408 GRTHOPEDIC PIN GUKDING DEVEQE Robert P. Childs, 4728 Homer Ave, Washington, l).C.;
Ray J. Hall, 12460 E. 31st Ave, Aurora, Colin; and
Austin D. Potenza, Silver Spring, Md. (66 Pine t.,
Garden City, NY.)
Filed Mar. 29, 1963, Ser. No. 259,221 3 Claims. (til. 128S3) (Granted under Title 35', US. Code (1952), see. 266) The invention described herein may be manufactured and used by or for the Government for governmental pur poses without the payment to us of any royalty thereon.
In orthopedic surgery it is frequently desirable to drive a plurality of surgical pins into a segment of bone in such a manner that the pins are parallel to one another. Some orthopedic pins have a nut on one end which is an integral part of the pin and cannot be removed from the pin without destroying desirable mechanical properties of the pin assembly. Where orthopedic pins have enlargements or nuts at their distal extremities, the prior art fails to teach a satisfactory device for guiding the entry of these pins, yet allowing the removal of such a guide after the pins have been positioned. Where a device with multiple parallel channels is used the channels must fit snugly enough around the shaft portion of the pins in order to guide them in a parallel fashion into the bone. But where the channels are snug enough for such guiding they are too small to allow removal of the device over the enlarged portion of the pin.
It is therefore an object of the instant invention to provide an orthopedic pin guiding device which can he removed after having served its function of guiding the entry of the pin into its desired position.
A second object of this invention is to provide in an orthopedic pin guiding device which can be removed after use, guide means for two or more sizes of orthopedic pins.
Other objects of this invention will be apparent to those skilled in the art upon examination of the following figures in which:
FIG. 1 is a section of the base portion of this device;
FIG. 2 is an elevation view of the guide disk of this device;
FIG. 3 is a plan view of the base portion shown in FIG. 1;
FIG. 4 is a plan view of the base portion showing the guide disk in operating position;
FIG. 5 is a plan view of the guide disk;
FIG. 6 is a perspective view of the preferred embodiment; and
FIG. 7 is a vertical section of the preferred embodiment assembled.
Briefly, this invention comprises a base portion having two generally circular coplanar disks rigidly connected along a portion of its circumference. Each of these disks is provided with a plurality of cylindrical parallel coaxial channels which are drilled to correspond in diameter with at least one size of common orthopedic pin. Each of these channels in the coplanar disks is connected to a larger channel corresponding with the size of the enlargement at the end of the orthopedic pin in such a way as to provide that an orthopedic pin corresponding in size to the smaller channel and resting in the smaller channel would, upon rotation of the base portion, be transferred from the smaller channel into the larger channel. At the diametrically opposite side of the larger channel, another smaller channel may be drilled through the base portion corresponding in each case with a diameter of a different size orthopedic pin.
Machined to slide rotatably between the two disks of the base portion is a guide disc having the same number of channels drilled therethrough in such a way as, with rota- United States Patent tion of the guide disk, corresponding channels on the same diameter may be aligned to provide a perfectly enclosed, though sectional, channel of the appropriate diameter. The device may be locked in this position. Upon turning the guide disk this channel will open up, and at another given point the larger channels will be aligned in order that the pin guide may be removed over the enlarged portion of the end of an orthopedic pin. If the pin guide is machined for two sizes of orthopedic pins, the second small channel is at the diametrically opposite side of the larger channel from the first small channel and can be aligned by further rotation of the guide disk. If the pin guide is drilled for two sizes of orthopedic pins, the guide disk will have two locking positions.
Positive locks can be provided at the appropriate positions by drilling the guide and the base portion to receive a pin. The guide disk may be rotated within the base portion around a spindle which spindle may itself be axially drilled and be used to guide another orthopedic pin. The guide disk may be provided with a handle for adjustment and with an indicator means to show the operator which series of channels are aligned at a given point.
Referring in more detail to the drawings,
l, a vertical section of the base portion, shows the two parallel disks joined along a portion of their circumference in a coplanar position.
PEG. 3 shows, in plan view, the base portion drilled for two sizes of orthopedic pins. The channels for the orthopedic pins are on opposite sides of a larger channel which is provided for removal over the enlarged end of the pin.
FIG. 4 shows in plan a guide disk 2 in working position with the base portion 1. The orthopedic pin is held firmly in channels 13 and 12 at point 26 by the interrelationship of guide disk 2 and base portion 1 respectively.
PEG. 5 shows the guide disk 2 with handle 4 and indicator 3. I should be noted that channels lid of guide disk 2 will correspond in size with channel 11 of base portion 1; and that channels 13 of guide disk 2 will correspond with channels 12 of base portion 1.
FIGS. 6 and 7 show in perspective and section respectively the assembled pin guide device with locking pin 6 and spindle 5. Locking pin 6 is inserted through channels 15 of pin guide 2 and 16 of base portion 1. It will be noted that there are two locking positions; one for each size of orthopedic pin. Indicator 3 is aligned with marks on base member 1 to show the operator the various alignment positions.
The parts of this device should be made of surgical stainless steel. Spindle 5 is used not only as an axle upon which to turn guide disk 2 but also to hold the assembly together. In practice, the channels on opposite sides of the large diameter channels may be of /8 inch and of inch, respectively, to correspond with the more popular size orthopedic needles.
The device is assembled by placing guide disk 2 into base portion 1 and then inserting spindle 5 into the central cylindrical channels of the base portion and the guide disk. The device may be locked in each of two positions for two sizes of orthopedic pins.
in orthopedic practice the surgeon would insert a guide pin through the lateral cortex of the femur in the axial line of the neck of the femur. This could be done with a guide pin not having an enlarged end. The instant pin guide device can then be oriented by threading the device over the pin through the guide pin hole in spindle 5. The device is then marked in one of the two previously described positions depending upon the diameter of the orthopedic pin. Pins are then inserted through the guides into the neck of the femur. When the enlarged ends of the pins have nearly reached the top of the pin guide device and when all pins have been inserted, the surgeon may then release the device from the lock pin and move the guide disk handle 4 to the neutral position thus orient- .pedic pins of predetermined size comprising a base portion having two generally circular mutually spaced parallel disks rigidly connected along a portion of their circumference, each of said disks being provided with a plurality of coaxial pairs of cylindrical parallel channels normal of coaxial pairs of cylindrical parallel channels normal to said disks and drilled to accept orthopedic pins of a first Y predetermined size and a plurality of coaxial pairs of cylinto said disks and drilled to accept the orthopedic pins of V predetermined size each of said channels connected to a larger channel so that upon rotation of said base portion, a pin projecting through a smaller channel would be trans ferred to said larger channel; an axial bore through each of said disks of such diameter to accept a spindle'of predetermined size; aguide ,di-s'k slidably rotatably mounted between said mutually spaced parallel disks and having correspondingly connected channels as the base disks but with the smaller channels connected to the larger channels oppositely as the base disk whereby each of said drical parallel channels normal to said disks and drilled to correspond in diameter with a second size of orthopedic pins, each of said channels being disposed on'opposite sides of alarger channel and connected to said larger channel whereby upon rotation of said base portion apin projecting through'a smaller channel will be transferred to said larger channel; a guide diskslidably and rotatably mounted between said mutually spaced parallel disks and having correspondinglyconnected channels as the base disks but with the channels accepting the first predetermined size of pins connected -to-the larger channels opsmallerchannels of said base portion fora given size pin can, upon rotation in one direction, be made to form, in
conjunction with a channelof said guide disk, a perfect,
2. The orthopedic pin guide described in claim 1 wherein said spindle contains a cylindrical channel bored axially to the diameter of an orthopedic pin.
3. The orthopedic pin guide described'in claim 1 further including rotation handle means for said guide disk;
4. The orthopedic, pin guide described in claim 1 further including indicator means for showing alignment of various'corresp onding channel combinations. I Y
5. An orthopedic pin guide configured to receive orthopedic pins of predetermined size comprising a base portion having two generally circular mutually spaced parallel disks rigidly connected along a portion of their circumference, each of said disks being provided with a plurality positely as the base disk whereby, upon rotation in one direction said base disks form in conjunction with a set of channels of said guide disk accepting the first predetermined size of pins, a perfect sectional cylinder, and upon rotation 'in the opposite direction can be made to form a sectional cylinder with said larger channels corresponding, and upon further rotation can be made to 'form a perfect sectional cylinder with said channels of said second sizevorthopedic pin'an axialbore through each of said disks of such diameter-to accept a spindle of predetermined size, a spindle mounted through the axial bore of said base portion and said guide disk; and locking means for said pin guide.
6. The orthopedic pin guide described 'in claim 5 further including a cylindrical channel axially bored to the diameter of .an orthopedic, pin through said spindle.
7. The orthopedic pin guide of claim 5 further including rotational handle means for said guide disk.
8. The orthopedic pinguide described in claim 5 further including indicator means for showing alignment of various cylindrical bore combinations.
References Cited by the Examiner UNITED STATES PATENTS 2,500,370 1 3/50 McKibbin 128-92 2,531,734 11/50 Hopkins 12892 RICHARD A. GAUDET, Primary Examiner.