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Patent US8137353 - Surgical saw - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA surgical saw for cutting bone that can be used with ease in tight places yet maintain sufficient cutting power. The surgical saw 10 has a flexible linear body made of twisted stainless steel wire and cutting parts formed on the flexible linear body. The cutting parts are made of abrasive material affixed...http://www.google.com/patents/US8137353?utm_source=gb-gplus-sharePatent US8137353 - Surgical sawAdvanced Patent SearchPublication numberUS8137353 B2Publication typeGrantApplication numberUS 11/430,823Publication dateMar 20, 2012Filing dateMay 10, 2006Priority dateMay 10, 2005Also published asUS20070055262Publication number11430823, 430823, US 8137353 B2, US 8137353B2, US-B2-8137353, US8137353 B2, US8137353B2InventorsKatsuro Tomita, Shigeo Kawakami, Masaaki Matsutani, Kanji MatsutaniOriginal AssigneeMani., Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (16), Non-Patent Citations (2), Classifications (7) External Links: USPTO, USPTO Assignment, EspacenetSurgical saw
US 8137353 B2Abstract
A surgical saw for cutting bone that can be used with ease in tight places yet maintain sufficient cutting power. The surgical saw 10 has a flexible linear body made of twisted stainless steel wire and cutting parts formed on the flexible linear body. The cutting parts are made of abrasive material affixed to the flexible linear body 12 a alternating with portions of the flexible linear body with no abrasive particles 12 b. Auxiliary cutting parts 13 of lesser cutting power may be provided along both lateral sides of each of the cutting parts 12. Images(5) Claims(5)
a primary cutting part adapted to cut hard tissue such as bone affixed to a portion of the flexible linear body, the primary cutting part including portions where abrasive particles are attached to the flexible linear body alternating with portions where no abrasive particles are attached to the flexible linear body, the portions with abrasive particles having a length of 1-5 mm;
secondary cutting parts each having a length longer than a length of the primary cutting part, adapted to cut hard tissue such as bone, having a coarse surface where no abrasive particles are attached to the flexible linear body, provided on both ends of the primary cutting part; and
a flexible hollow tube of synthetic resin, dimensioned to allow the flexible linear body to pass therethrough.
2. The surgical saw according to claim 1, wherein the flexible linear body is a single strand of metal wire,
3. The surgical saw according to claim 1, wherein the flexible linear body is stranded wire or mesh line.
4. The surgical saw according to claim 1, wherein at least the primary cutting part of the flexible linear body is coated with a lubricating material.
5. The surgical saw according to claim 1, further comprising a pair of handles attached at opposed ends of the flexible linear body. Description
Consequently, Japanese Registered Utility Model No. 3018201 proposes a surgical saw having a forked frame with two arms is proposed, with a wire strung between the tips of the two arms of the frame and the base of the frame attached to a vibrating device such as a reciprocator.
A stranded wire made of a metal such as stainless steel is used for the wire of the surgical saw described in Japanese Registered Utility Model No. 3018201, with the wire given a coarse surface. The coarseness of the surface cuts the bone.
However, the saw described in Japanese Registered Utility Model No. 3018201, because it coarsens the surface of metal wire, suffers from inadequate cutting power. In addition, the wire is strung straight between the tips of the arms, which necessitates a working space at least equal to the length of the wire and thus makes the saw difficult to use in tight places.
A surgical saw according to a first aspect of the present invention can maintain flexibility by alternating portions where abrasive particles are affixed for cutting with portions with no abrasive particles affixed, and therefore can be used in tight places. Moreover, cutting power sufficient to cut through such hard tissue as bone can be obtained with the surgical saw of the present invention. In addition, according to a second aspect of the present invention, auxiliary cutting parts are provided in addition to the cutting part to enable bone to be cut without damaging soft tissue such as blood vessels and nerves (including thick nerves such as the spinal cord). In addition, according to a third aspect of the present invention, the surgical saw is coated with a lubricating material and can therefore prevent leakage of toxic material from the linear body, thereby improving the suitability of the surgical saw for work with living tissue. Additionally, the lubricating coating enables the surgical saw to cut smoothly.
The linear body 11 uses a stainless steel wire having a diameter of approximately 0.3-1.0 mm. Using stainless steel prevents rust, enabling the adverse effects of rust on human tissue to be eliminated. It is preferable to use something flexible that can bend to the shape of the bone for the linear body 11 although a single strand may be used provided that it is annealed, it is preferable to use a stranded wire or mesh line. Using stranded wire and mesh line makes it possible to obtain a linear body 11 that is flexible as well as strong. In addition, the surfaces of the stranded wire or mesh line are uneven, and this unevenness, although it provides little cutting power, nevertheless has enough cutting power to saw through bone without damaging soft tissue such as blood vessels and nerves. There is no particular limit on the number of strands in the stranded wire. In the present embodiment, the number of strands is 7�7 (for a total of 49 strands).
The surgical saw 10 is coated with a lubricating material. Silicon resin and TEFLON (TEFLON� is a registered trademark of E. I. DU PONT DE NEMOURS AND COMPANY, a Delaware corporation) may be used as lubricants. The coating prevents the linear body 11 from directly contacting tissue and can prevent leakage of toxic materials such as nickel and the like from the linear body 11 and thus improves the suitability of the saw for use with living tissue. In addition, where the abrasive particles affixed to the linear body 11 are large and apt to cut too much and in an unstable manner, use of the coating allows the surgical saw 10 to cut smoothly. Although the coating may be applied only to the cutting parts 12, it is preferable that the auxiliary cutting parts 13 be coated as well. Provided that it provides good lubrication, the substances that may be used as the lubricant are not limited, and moreover are not limited to fluids and may be powders.
Then, as shown in FIG. 3E, the ends of the surgical saw 10 are pulled alternately so as to cut. Where there is soft tissue such as blood vessels and nerves nearby as is the case with the spinal vertebrae 30, it is preferable that initially the spinal vertebrae 30 be cut into slightly with the auxiliary cutting parts 13 so as to provide a groove for the cutting parts 12 of the surgical saw 10 to follow, after which the spinal vertebrae 30 may be cut away with the cutting parts 12. The cutting force of the auxiliary cutting parts 13 is small, and therefore the blood vessels and nerves can be pushed aside and moved away from the location of the cut without damaging them. Then, if bone is to be cut with the cutting parts 12, these cutting parts 12 pass through a space formed (cut away) by the auxiliary cutting parts 13, and therefore damage to the blood vessels and nerves can be prevented.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS184804 *Oct 5, 1876Nov 28, 1876 Improvement in surgical sawsUS1306636 *Jun 18, 1918Jun 10, 1919George May SelbyAbrasive wire rope.US2752964 *Apr 15, 1953Jul 3, 1956Stanley PrusinskiFlexible hand sawUS3150470 *Aug 11, 1961Sep 29, 1964Barron Lee HDiamond coated wire sawUS4258763 *Nov 20, 1978Mar 31, 1981Fernando FigueredoCutting device having a flexible cutting elementUS4464836 *Sep 15, 1982Aug 14, 1984Hissa Robert EFriction saw and handle assemblyUS4709699 *Aug 6, 1986Dec 1, 1987Fort Wayne Metals Research Products CorporationSurgeon's Gigli saw and methodUS5817711 *Aug 11, 1997Oct 6, 1998Nippei Toyama CorporationAqueous working liquid composition for wire sawUS6063083 *May 22, 1998May 16, 2000Duong-Van; MinhElectrosurgery blade having discrete point discharge saw-tooth edgeUS6152894 *Mar 23, 1999Nov 28, 2000Kubler; HaraldSurgical cutting instrumentUS20020151905 *Apr 11, 2002Oct 17, 2002Jun IshiharaPin for forming a hole for inserting an indwelling needleUS20030224705 *Feb 21, 2003Dec 4, 2003Schmidt James E.Diamond abrasive tonehole file for woodwind musical instrumentsUS20050216023 *Mar 29, 2004Sep 29, 2005Luke AramMethod and apparatus for arthroscopic bone preparationUS20060089609 *Oct 15, 2005Apr 27, 2006Baxano, Inc.Devices and methods for tissue modificationUS20080255624 *Mar 30, 2007Oct 16, 2008Gregory ArcenioMethods and devices for multipoint access of a body partJPH0318201A Title not available* Cited by examinerNon-Patent CitationsReference1 *Fred H. Albee, Bone Surgery with Machine Tools, Apr. 1936, The Scientific American Digest, pp. 178-181.2 *K. Tomita et al., The Threadwire Saw: a New Device for Cutting Bone. A Brief Note, Dec. 1996, JBJS, vol. 78-A, No. 12, pp. 1915-1917.* Cited by examinerClassifications U.S. Classification606/82International ClassificationA61B17/00Cooperative ClassificationA61B2017/145, A61B17/14, A61B2017/143, A61B17/15European ClassificationA61B17/14RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services