RETRACTOR APPARATUS

Abstract: A retractor apparatus includes an extension rod (350), first and second support rods (312, 330) and first and second clamps (360, 370). The extension rod (350) is attached to the first support rod with the first clamp. The first support rod (312) is attached to the second support rod (330) with the second clamp (370). The first and second support rods (312, 330) extend outwardly over the surgical table on opposite sides of the incision and the second support rod (330) may be moved relative to the first support rod (312) so as to correctly position the retractors over the incision.

Description: RETRACTOR APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention. The present invention relates to surgical retractor apparatus, and in particular, it relates to a retractor apparatus that is positionable to an area proximate an incision. 2. Description of the Prior Art. In abdominal and chest surgery, it is customary to use a retractor apparatus that is direct¬ ly mounted to the operating table. The apparatus includes retractors that hold back tissue proximate to the surgical incision to enable the surgeon to work in areas such as the abdominal area or chest cavity. Most retractor apparatus are positioned above a surgical drape that defines the sterile area where the surgeon and other attendants need to move to perform the surgery correctly and efficiently. The usefulness of any retractor apparatus is limited by the number of ways that the retractors can be positioned with respect to the incision of the body and with the ease and simplicity that the surgeon can adjust the relative position of the retractor before and during surgery. In addition, the retractor apparatus should not pose any great obstructions to the surgeon's movement during surgery or take up a great amount of space, limiting the movement of the surgeon and other attendants. There have been many attempts in developing a suitable retractor apparatus. For example, the following patents illustrate retractors and/or retractor support apparatus that are movable along a single plane: SUBSTITUTE SHEET Inventor U.S. Patent No. Sloan 1,707,689 Smith 2,586,488 Smith 2,594,086 Cooper 2,893,378 Raeuchie 3,038,468 Kohlman 3,749,088 Gauthier 3,965,890 Trumbull et l 3,998,217 Gauthier 4,010,741 Hurso 4,048,987 Gauthier 4,337,762 Estes et al 4,421,107 Cabrera 4,421,108 Country Patent No. Italy 446,439 In addition, there are several patents and one brochure that illustrate devices and apparatus that permit pivotal movement of the retractor and/or some component of the apparatus about one axis with some also including movement along one plane: Inventor U.S. Patent No, Van Meter 497 ,064 Spurr 1,168,574 Crossley 1,230,873 Barlow et al 2,623,517 Nelson 2,670,732 Grieshaber 3,040,739 Jensen 3,572,326 LeVahn 4,355,631 Country Patent No. Italy 446,439 Germany 460,145 Brochures "Pilling Retractor Systems", four-page brochure of Narco Scientific, Pilling Division, Fort Washington, Pennsylvania, dated 12/81. There are also several patents, brochures and articles that either illustrate or discuss SUBSTITUTE SHEET retractor apparatus that permit pivotal movement about two axes with some also permitting movement along a single plane: "Thompson Retractor," two-page brochure of Richard C. Thompson, M.D., San Mateo, California. Price List of Automatic Retractor Holder of Great Eastern Lumber Company, Inc., New York, New York. "Bookwalter Retractor," two-page brochure of Codman & Shurtleff, Inc., Randolph, Massachusetts. Articles King, W.B., "Use of Table-Fixed Abdominal Retractors," American Journal of Surgery, Vol. 108, pp. 606-609, November 1964. Thompson, R.C. et al, "Mechanical Aids at the Operating Table," California Medicine, Vol. 97, No. 1, pp. 28-30, July 1962. At least two prior art patents, the Milo U.S. Patent 3,858,578 and the Poletti U.S. Patent 3,638,973 disclose retractor arms that are movable through the use of ball joints. Although ball joints provide a great degree of flexibility and movement. SUBSTITUTE SHEET ■ holding power and rigidity are sacrificed. In many of the above prior art references, the surgeon does not have the ability to position the retractor universally, but is limited by the limited movement of retractor support apparatus. In addition, some of the developments in retractor apparatus in attempting to improve versatility in movement have sacrificed space and created obstructions for the surgeon. SUMMARY OF THE INVENTION The present invention allows a surgeon to position retractor support rods proximate to an incision. The retractor apparatus includes an extension rod, first and second support rods and first and second clamps. The extension rod is attached to the first support rod with the first clamp. The first support rod is attached to the second support rod with the second clamp. The first and second support rods extend outwardly over the surgical table on opposite sides of the incision and the second support rod may be moved relative to the first support rod so as to correctly position the retractors over the incision. The retractor apparatus of the present invention permits a surgeon or one of his attendants to adjust the relative position of the retractors by moving a second support rod either closer or farther from the first support rod. The apparatus provides movable joints through the clamping mechanisms while also providing a joint that is exceptionally rigid, just as rigid as a support rod. The support apparatus does not require much space and provides little obstruction to the surgeon and attendants. SUBSTITUTE SHEET BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top view of an alternative embodiment. Figure 2 is a sectional view taken along the line 2-2 in Figure 1. Figure 3 is a sectional view taken along the line 3-3 in Figure 1 with portions shown whole. Figure 4 is a side view of the clamping mechanism of Figure 3. Figure 5 is an end view of the clamping mechanism of Figure 3 with portions shown in a sectional view. Figure 6 is a perspective view of the embodiment of Figure 1. Figure 7 is an exploded perspective view of the portion of Figure 6 enclosed within dotted line 1000. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention, an adjustable wishbone-type retractor support apparatus, is generally indicated at 310 in Figure 1. The embodiment 310 has a first support rod 312. The first support rod 312 has a tapered end 314 with a blunt point 315, a first substantially linear portion 316, and a first curved portion or elbow 318 having a reduced diameter. The first support rod 312 also has a second or middle substantially linear portion 320, a second elbow or curved portion 322 having a reduced diameter and a third substantially linear or end portion 324. The embodiment also includes a second support rod 330. The second support rod 330 has a tapered end 332 with a blunt'point 333, a SUBSTITUTE SHEET substantially linear portion 334, a single elbow or curved portion 336 having a reduced diameter, and a second substantially linear or end portion 338. The embodiment further includes an extension rod 350. The extension rod has a leg 352 with an end portion 354, as illustrated in Figure 2, which is connected to the third substantially linear portion 324 of the first support rod 312 through a first clamp 360. The first clamp 360 is actuated by a handle 362 which also terminates in a blunt end 364. The third substantially linear portion 324 of the first support rod 312 is also connected to the second substantially linear portion 338 of the second support rod 330 by a second clamp 370. The second clamp 370 has a handle 372 having a blunt end 374. The first clamp 360 and the second clamp 370 are located on the third substantially linear portion 324 of the first support arm 312 such that the first clamp 360 lies between the second clamp 370 and the second elbow or curved portion 322. When released, the second clamp 370 allows for alteration of the angular relationship between the third substantially linear portion 324 of the first support arm 312 and the second substantially linear portion 338 of the second support arm 330. In Figure 1, an altered angular relationship between the first support arm 312 and the second support arm 330 is indicated by broken lines 390. As illustrated in Figure 2, the clamp 360 includes a first clamp handle 362 with a handle connecting end 400. The handle connecting end 400 has a pin receiving aperture 402 disposed generally SUBSTITUTE SHEET perpendicular to the axis of the handle 362. A pivot pin 404 extends through the aperture 402. A turning bolt 406 includes a bolt head 409 having a handle retaining member 408. The combination of the pivot pin 404 and the rounded end 403 allows handle 362 to pivot approximately 180° on the turning bolt 406 about the pivot pin 404. Depending from the bolt head 409, the turning bolt 406 has a radially extending flange or shoulder 410 and a shank portion 412 terminating in a threaded shank portion 414. The shank portions 412 and 414 lie generally along aixs 413. The first clamp 360 includes a first clamping section or upper clamp body 430. The first clamping section 430 is a unitary body and has a first clamping bore 432 located proximate one end of the first clamping section 430. The clamping bore 432 has a diameter approximately equivalent to the diameter of the third substantially linear portion 324 of the first support rod 312. A slot 434 extends radially from the clamping bore 432 and across the unitary body of the first clamping section 430 generally opposite the proximate end. The slot 434 defines an upper resilient leg 436 and a lower resilient leg 438 of the first clamping section 430. The upper and lower resilient legs 436 and 438 tend to reduce the diameter of the first clamping bore 432 when they are squeezed together. Squeezing upper and lower resilient legs 436 and 438 together and thus reducing the diameter of the first clamping bore 432 serves to frictionally clamp the third substantially linear SUBSTITUTE SHEET portion 324 of the first support rod 312. The lower resilient leg 438 also includes a female or recessed frusto-conical surface 442. The female or recessed frusto-conical surface 442 of the lower resilient leg 438 shares the axis 413 with an aperture 440 in the upper resilient leg 436. The aperture 440 has a diameter sufficient to allow the threaded portion 414 and the shank portion 412 but not the shoulder 410 of the bolt 406 to pass through. The first clamp 360 also includes a clamp base 450. The clamp base 450 has a generally cylindrical outer surface 451,, A bore 456 extends radially through the base 451. Within the bore 456 the end 354 of the extension rod 350 is attached and preferably permanently locked. A male frusto-conical surface 452 extends outwardly from the clamp base 450 along the axis 413. A threaded recess 454 is disposed along the axis 413 frusto-conical surface 452 for threadably engaging the threaded shank portion 414. The male frusto-conical surface 452 is configured to cooperate with the female frusto-conical surface 442 of the first clamping section 430 to frictionally engage the surface 442. In use, as the turning bolt 406 is turned and thereby drawn further into the threaded recess 454, upper and lower resilient legs 436 and 438 are drawn or squeezed together, thereby reducing the radius of the first clamping bore 432 and thus frictionally clamping or locking the third substantially linear portion 324 of the first support rod 312 within the first clamping bore 432. Simultaneously, the female frusto-conical surface 442 SUBSTITUTE SHEET frictionally engages the male frusto-conical surface 452 such that the angular relationship of the clamp base 450 is fixed or frictionally clamped with respect -to the first clamping section 430, thereby also fixing the angular relationship between the third substantially linear portion 324 of the first support rod 312 and extension rod 350 about the pivot axis 413. The first clamp 360 may be further refined. For example, as turning bolt 406 is rotated and drawn into threaded portion 454, the radial shoulder 410 engages the upper resilient leg 436, forcing it closer to the lower resilient leg 438. In a specially preferred embodiment, a friction-reduction ring 420 disposed between the bolt radial shoulder 410 and the upper resilient leg 436 reduces friction thereby making rotation of the turning bolt 406 easier and more effective in applying pressure within the clamp 360. The ring 420 is made of a material that reduces friction between the shoulder 410 and the upper leg 436. One suitable material is sold under the trademark "DELRIN" by DuPont DeNemours & Co. of Wilmington, Delaware. The second clamp handle 372 has a handle end portion 470 that includes a pin receiving aperture 472 as illustrated in Figure 3. A turning bolt 476 includes two handle receiving members 478 and 480 on a bolt head 491. The handle receiving members 478 and 480 are spaced apart to allow the handle end portion 470 to be positioned between the members 478 and 480. The handle retaining members 478 and 480 each have a pin receiving aperture 482 and 484 which SUBSTITUTE SHEET are disposed about a common pivot axis 486. When the handle end portion 470 is placed between the handle retaining members 478 and 480 such that the ' pin receiving aperture 472 of the handle end 470 shares the common pivot axis 486, and a pivot pin 490 connects the three apertures 472, 482 and 484, the second clamp handle 372 is pivotable approximately 180° to the turning bolt 476 about the common pivot axis 486. The turning bolt 476 also includes a radially extending flange or shoulder 492 depending from the bolt head 491, followed by a shank portion 494 and terminates in a threaded end portion 496. The turning bolt 476 rotates about an axis 500. The second clamp also includes an upper unitary clamping body member 510 having an upper resilient leg 512 and a lower resilient leg 514 separated by a slot 516. The upper resilient leg 512 has an aperture 518 of diameter approximately equal to the diameter of the shank portion 494 of the turning bolt 476. The lower resilient leg 514 has a recessed or female frusto-conical surface 520 disposed about the axis 500 as the aperture 518 of the upper resilient leg 512. The second clamp 370 also includes a lower clamping member 550. The lower clamping member 550 has a clamping bore 552 proximate one end of the lower clamping member 550. A slot 554 extends radially from the clamping bore 552 to an opposite end of the lower clamping member 550. The slot 554 defines an upper resilient leg 556 and a lower resilient leg 558. The clamping bore 552 has a diameter TITUTE SHEET approximately equivalent to the third substantially linear portion 324 of the first support rod 312. When the third substantially linear portion 324 of the first support rod -312 is inserted within the clamping bore 552 and upper resilient leg 556 is forced closer to lower resilient leg 558, the diameter of clamping bore 552 is slightly reduced. Reducing the diameter of the clamping bore 552 provides a frictional clamping action upon the third substantially linear portion 324 of the first support rod 312. A male or protruding frusto-conical surface 560 extends outwardly from the upper resilient leg 556, perpendicularly to the slot 554. The male frusto-conical surface 560 is configured to mate with the female frusto-conical surface 520 of the lower resilient leg 514 of the upper clamping member 510. Coaxially disposed with the frusto-conical surface 560 is a pivot bore or aperture 562 having a diameter approximately equal to the diameter of the shank 494 of the turning bolt 476. The lower resilient leg 558 has a threaded aperture or pivot bore 564 generally disposed about the axis 500 as the pivot bore 562 of the upper resilient leg 556. The proportions of the threaded aperture 564 are such that they generally match the threaded end portion 496 of the turning bolt 476. In use, rotation of the turning bolt 576 about its longitudinal axis 500 such that bolt 576 is drawn further within threaded aperture 564 applies a force squeezing the upper resilient leg 512 closer to the lower resilient leg 514 of the upper clamping SUBSTITUTE SHEET member 510 and squeezing lower resilient leg 558 closer to the upper resilient leg 556 of the lower clamping member 550 and further squeezing the male frusto-conical surface 560 tightly against the female frusto-conical surface 520. When this tightening or clamping action occurs, shoulder 492 of turning bolt 476 is forced against the upper resilient leg 512 of the upper clamping member. In an especially preferred embodiment, a friction-reduction ring 580 is interposed between the shoulder 492 of the turning bolt 476 and the upper resilient leg 512 of the upper clamping member 510. The friction-reduction ring 580 is preferably formed of friction reducing material. A suitable material is sold under the trademark "DELRIN" by DuPont DeNemours & Co. of Wilmington, Delaware. Rotation of the turning bolt 476 about the axis 500 is facilitated by applying a tangential force to the handle- 372. Such a force is most effective when the handle 372 is at right angles to the axis 500. The spaced apart arrangement of the handle receiving members 478 and 480 effectively translates this force into rotation of the turning bolt 476. A combination of the handle 372 and the friction-reduction ring 580 allows the bolt 476 to be drawn further within the threaded aperture 564, thus a PPlyin a tremendous squeezing force to the clamp 370. As illustrated in Figure 4, the third substantially linear portion 324 has an end surface 328 and a protruding notch or pin 574 extending radially from the third substantially linear portion SUBSTITUTE SHEET 324, proximate to the end surface 328. The protruding notch or pin 574 fits within a fan-shaped recess 570 disposed within the lower clamping body 550. The fan-shaped recess extends generally radially from the clamping bore 552 in the same general direction as the slot 554, such that the protruding notch or pin 574 is engageable within the fan-shaped recess 570. Rotation of the third substantially linear portion 324 within the clamping bore 552 is limited to the rotation allowed between stop shoulders 575 and 577 which define the arc angle of the fan-shaped recess 570. When the protruding notch or pin 574 is fitted within the fan-shaped recess 570 and the first support rod 312 is locked in a stationary position through the use of the first clamp 360, the second clamp 370 may only rotate about clamping bore 552 within the limits defined by the stop shoulders 575 and 577. The upper clamping body 510 also includes a clamping aperture or bore 526 with a radially extending fan-shaped recess 528 having stop shoulders 529 and 531 as illustrated in Figure 5. The clamping bore 526 has a diameter approximately equal to the second substantially linear portion 338 of the second support rod 330. Disposed within the clamping bore 526 is the second substantially linear portion 338 of the second support rod 330. The second substantially linear portion 338 includes a pin receiving aperture 529 extending therethrough. The aperture 529 partly contains a protruding pin 530 having a length longer SUBSTITUTE SHEET than the diameter of the second substantially linear portion 338 and a radius generally equivalent to the pin receiving aperture 529. The pin 530 extends from the bore 529 at a substantially right angle from the second end portion 338 and is engageable within the recess 528. In combination, the protruding pin 530 and the fan-shaped recess 528 serve to limit the rotation of the second substantially linear portion 338 within the bore 526„ In a similar manner to that described for the lower clamping body 550, the upper and lower resilient legs 512 and 514 when forced closer together, narrow the slot 516 and slightly reduce the diameter of the clamping bore 526. Reducing the diameter of bore 526 causes a frictional clamping action against the second substantially linear portion 338 of the second support rod 330. Thus, the three clamping bores 432, 526 and 552 all function similarly. The alternative embodiment 310 is further illustrated in Figure 6. The extension rod 350 supports the first clamp 360 which in turn engages the third substantially linear portion 324 of the first support rod 312. The first clamp 360 is tightened or loosened by applying force to the handle 362. A second handle retaining member 407 is in a spaced apart relationship with the first handle retaining member 408 and serves to help translate force applied to the handle 362 into rotation of the turning bolt 406, in similar fashion to that described for the bolt 476. When the first clamp 360 is loosened, the first support rod 312 has two SUBSTITUTE SHEET degrees of freedom, first rotation about the pivot axis 413 of the first clamp 360 and second, rotation of the third substantially linear portion 324 of the first support rod 312 within the first clamp 360. When the handle 362 is employed to lock clamp 360, the movement of the first support rod 312 becomes locked with respect to these two degrees of freedom. The second clamping mechanism 370 connects the second substantially linear portion 338 of the second support rod 330 to the third substantially linear portion 324 of the first support rod 312. The second clamp 370 is tightened or loosened by the handle 372. When loosened, the second clamping mechanism 370 allows three degrees of freedom to the second support rod 330 with respect to the first support rod 312. First, the clamping mechanism 370 has a limited rotation about the third substantially linear portion- 324 of the first support rod 312. Second, a rotation about the pivot axis 500 is available. Third, a rotation of the second substantially linear portion 3-38 of the second support rod 330 within the second clamping mechanism 370 is available. When the handle 372 of the second clamping mechanism 370 is moved to a tightening or locking position, all three degrees of freedom are locked. Thus, in the alternative embodiment 310, five degrees of freedom are available to the first support rod 312 and the second support rod 330 with respect to the extension rod 350. These five degrees of freedom may be locked by turning the handles 362 and 372. SUBSTITUTE SHEET The clamp base 450 supports the first clamping section 430 which is held in place by the turn bolt 406. The third substantially linear portion 324 is connected through the first clamping section 430 and through the lower clamping member 550. The protruding notch or pin 574 limits the rotation of the lower clamping member 550 upon the third substantially linear portion 324 within the range indicated by arrows 1030. The first clamping section 430 may rotate about pivot axis 413 on the clamp base 450 a full 360° as indicated by arrows 1010. The third substantially linear portion 324 rotates within the first clamping section 430 a full 360° as indicated by arrows 1020. The lower clamping member 550 may rotate upon the third substantially linear portion 324 a limited angle as indicated by arrows 1030 in part because of the protruding pin or notch 574. The upper clamping member 510 may rotate about the pivot axis 500 upon the lower clamping member 550 a full 360° as illustrated by arrows 1040. Finally, the second substantially linear portion 338 may rotate within the upper clamping member 510 a limited angle as illustrated by arrows 1050, due in part to the interaction of the protruding pin 530. Turning " the bolt 406 serves to lock the pivotal rotation as illustrated by arrows 1010 and the bore rotation as illustrated by arrows 1020, and is actuated by handle 362. Turning the bolt 476 serves to lock the pivotal rotation illustrated by arrows 1040 as well as the bore rotations as illustrated by arrows 1030 and 1050 and is actuated SUBSTITUTE SHEET by turning the handle 372. Thus, a nearly infinite number of arrangements of the first support rod 312 and the second support rod 330 are available with respect to the extension rod 350. Once locked in position, the apparatus 310 may be used to support various retractors. Although the present invention has been described with references to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. SUBSTITUTE SHEET

Claims: WHAT IS CLAIMED IS: 1. A retractor apparatus for attaching a retractor thereto, the apparatus comprising: a first support rod with a first end portion? a second support rod with a second end por¬ tion; an extension rod with a third end portion; a first clamping means for connecting the third end portion of the extension rod to the first end portion of the first support rod, the first clamping means having both a base means portion and a first clamping section whereas the base means has a first pivot bore extending therethrough with the third end portion of the extension rod attached to the base means whereas the base means has a frusto-conical section extending outwardly, the first clamping section having a unitary body with a second pivot bore extending therethrough and a first clamping bore extending therethrough proximate one end of the body and a slot running through the body from the first clamping bore to an opposite end of the body, separating the body into first and second resilient leg portions that when a force means is applied to the leg portions the diameter of the first clamping bore is reduced, thereby frictionally clamping the first end - 19 - portion of the first support rod, the first clamping section having a frusto-conical recess such that the base means and the first clamping section are joined together in a frictional engagement by inserting a frusto-conical section of the base means into the frusto-conical recess of the first clamping section; a second clamping means for connecting the first end portion of the first support rod to the second end portion of the second support rod, the second clamping means having both a second clamping section and a third clamping section whereas the second clamping section has a unitary body with a third pivot bore extending therethrough and a second clamping bore extending - therethrough proximate one end of the body and a slot running through the body from the second clamping bore to an opposite end of the body, separating the body into third and fourth resilient leg portions that when a force means is applied to the leg portions the diameter of the second clamping bore is reduced thereby frictionally clamping the first end portion of the first support rod, the second clamping section having a frusto-conical section extending outwardly; the third clamping section SUBSTITUTE SHEET having a unitary body with a fourth pivot bore extending therethrough and a third clamping bore extending therethrough proximate one end of the body and a slot running through the body from the third clamping bore to an opposite end of the body, separating the body into fifth and sixth resilient leg portions that when a force means is applied to the leg portions the diameter of the third clamping bore is reduced, thereby frictionally clamping the second end portion of the second support rod, the third clamping section having a frusto-conical recess such that the second clamping section and the third clamping section are joined together in a frictional engagement by inserting a frusto-conical section of the second clamping section into the frusto-conical recess of the third clamping section. 2. The apparatus of claim 1 wherein the first clamping means has the first pivot bore and the second pivot bore coaxially aligned with respect to a pivot axis running through the first clamping means, the force means includes a turning bolt extending through the pivot bores and threadably engaging the base means thereby providing a force that brings the first and second leg portions of the first clamping section together when the bolt is turned. 3. The apparatus of claim 2 wherein the turning bolt includes a head section having first and second spaced-apart handle-retaining members, each handle- retaining member having first and second pin- receiving apertures, positioned along a pin pivot axis and further including a handle having a section positionable between the first and second retaining members and having a third pin-receiving aperture alignable with the first and second pin-receiving apertures and the pivot pin insertably engaging the first, second and third apertures, such that the handle is pivotable approximately 180°. 4. The apparatus of claim 1 wherein the second clamping means has the third pivot bore and the fourth pivot bore coaxially aligned with respect to a pivot axis running through the second clamping means, the force means includes a turning bolt extending through the pivot bores and threadably engaging the second clamping section thereby providing a force that brings the third and fourth leg portions of the second clamping section and the fifth and sixth leg portions of the third clamping section together when the bolt is turned. 5. The apparatus of claim 4 wherein the turning bolt includes a head section having first and second spaced-apart handle-retaining members, each handle- retaining member having first and second pin- receiving apertures, positioned along a pin pivot axis and further including a handle having a section positionable between the first and second retaining SUBSTITUTE SHEET members and having a third pin-receiving aperture alignable with the first and second pin-receiving apertures and the pivot pin insertably engaging the " first, second and third apertures, such that the handle is pivotable approximately 180°. 6. The apparatus of claim 1 wherein the third clamping section may be moved about a pivotal axis of the second clamping section such that a distal portion of the second support rod may be moved in a proximal relationship with a distal portion of the first support rod. 7. β The apparatus of claim 1 wherein the first support rod has a first protruding notch extending from the first end portion at a substantial right angle. 8. The apparatus of claim 1 wherein the second support rod has a second protruding notch extending from the second end portion at a substantial right angle. 9. The apparatus of claim 7 wherein the first clamping section has a fan-shaped recess into the body adjoining the opening of the second clamping bore such that the first protruding notch of the first support rod is engagable in the recess. 10. The apparatus of claim 8 wherein the second clamping section has a fan-shaped recess into the body ajoining the opening of the third clamping bore SUBSTITUTE SHEET such that the second protruding notch of the second support rod is engagable in the recess. 11. A clamping mechanism for connecting first and second rod sections of a retractor apparatus, the mechanism comprising: a first section with a frusto-conical section extending outwardly therefrom; a second section having a frusto-conical re¬ cess for frictional engagement with the frusto-conical section of the first section such that when the frusto-conical section is engaged in the frusto-conical recess, the first and second sections are placed in an adjoining fashion; and means for providing a force to bring together the first and second sections in an adjoining fashion. 12. The means for providing the force of claim 11 wherein the first section has a first pivot bore extending therethrough; the second section has a second pivot bore extending therethrough; a clamping mechanism including a turning bolt extending through the first and second pivot bores and threadably engaging the first section to provide a force to bring the sections together when the bolt is turned. 13. The clamping mechanism of claim 11 wherein the turning bolt includes a head section having first and second spaced-apart handle-retaining members, SUBSTITUTE SHEET each handle-retaining member having first and second pin-receiving apertures positioned along a pin pivot axis and further including a handle having a section positionable between the first and second retaining members and having a third receiving aperture alignable with the first and second pin-receiving apertures and a pivot pin insertably engaging the first, second and third apertures, such that the handle is pivotal approximately 180 θ „ SUBSTITUTE SHEET

Inventors: LEVAHN BRUCE A, OLSON ROBERT E, LEVAHN, BRUCE, A., OLSON, ROBERT, E.
Applicants: MINNESOTA SCIENTIFIC INC, MINNESOTA SCIENTIFIC, INC.
Application year: 1988
Main classification: A61B17
IPC codes: A61B17