US20080223475A1 - Method for securing objects using wires - Google Patents
Method for securing objects using wires Download PDFInfo
- Publication number
- US20080223475A1 US20080223475A1 US11/717,034 US71703407A US2008223475A1 US 20080223475 A1 US20080223475 A1 US 20080223475A1 US 71703407 A US71703407 A US 71703407A US 2008223475 A1 US2008223475 A1 US 2008223475A1
- Authority
- US
- United States
- Prior art keywords
- tool
- wires
- break
- point
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
- B21F15/02—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire
- B21F15/04—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire without additional connecting elements or material, e.g. by twisting
Abstract
The invention controls the break-off point of twisted wires to predictably break at the edge of the tightening tool. This is achieved by slightly weakening the wire at this point, using the pressure of the tightening tool and the shape of the jaw to introduce a controlled weak point. The tool creates uniform and strong twisted wire joints.
Description
- The invention relates to securing objects using wires, and in particular to securing broken or cut bones in the human body using wires as well as tightening ligature wires in orthodontics.
- The use of wires to secure objects by twisting the ends of the wires dates back many centuries, but so does the uncertainty of this process.
FIG. 1 shows an object broken or cut into twoparts wires 2 twisted to formjoints 3 usingpliers 4 or a similar tool.Joint 3 is reliable when it consists of multiple twists of wire. Quite frequently the wire breaks closer to the object, leaving an insufficient number of turns as shown by 3A. In such cases the joint frequently opens when stressed, as shown by 3B. This is particularly undesirable in surgery such as sternotomy where the sternum is held together by such twisted wires after the surgery. Any joint failure as shown by 3B requires a new surgery. Similar use of wires and similar problems is found in orthodontics and many other areas of medicine. While this problem is critical in surgery it is common to many non-medical fields such as tightening re-enforcement bars in concrete work, using wires as hose clamps, twisting wires to form electrical connections and many other applications. The most common solution to this problem in prior art is to replace the wire twisting with a crimped ferrule 13. This solution, while reliable, adds cost, complexity and sometimes is not feasible because of limited access to the area. - The invention enables the break-off point of twisted wires to predictably occur at the edge of the tightening tool. This is achieved by slightly weakening the wires at this point, using the pressure of the tightening tool and the shape of the jaw to introduce a controlled weak point. Such a uniform break-off point allows secure and uniform twisted wire joints.
-
FIG. 1 shows a perspective view of the prior art. -
FIG. 2 shows a perspective view of the uniform break-off in wires twisted according to the invention. -
FIG. 3 shows a tool that can be used to practice the invention. -
FIG. 4 shows an alternate form of a tool used to practice the invention. -
FIG. 5 shows an enlarged view of the wires breaking off. - It was found that the break-off point of the twisted wires can occur at the edge of the pliers in a completely predictable manner if the wire at this point will be slightly weaker than at the rest of the twisted section.
FIG. 2 shows the appearance ofobjects twisted wires 2 having thetwisted section 3 break-off at a uniform point. Clearely 1A and 1B can also be separate objects. It was also found that the simplest way to introduce such a controlled weakening is to squeeze the twisted wires at a high pressure, significantly higher than the pressure created when regular pliers or similar tools are used. This allows varying the length of the twisted section simply by changing the point of gripping the wires with the tool. The pressure depends on the wire diameter; for stainless steel wires commonly used in sternotomy (0.7-1 mm diameter) the pressure of the jaws of the tool should be in the range of 100-300 Kg. In order to easily generate the required high pressure, a high leverage system or toggle system is used as shown in the tools ofFIG. 3 andFIG. 4 . In order to have a uniform pressure, not dependent on operator, it is desired to build into the tool some form of snap action which locks thetool arms - Referring now to
FIGS. 3 and 4 ,tool 4 comprises of hardenedsteel jaws 5 pivoting on hardenedpivot 6 and actuated byarms pivots FIG. 3 andFIG. 4 can easily have a mechanical advantage of 30:1 thus no more than 10 Kg of force are needed at handles 10 to created 300 kg of pressure at tip ofjaws 5.FIG. 3 shows a tool shape similar to currently used surgical pliers whileFIG. 4 shows a different style ofhandles 10 to make thetool 4 acquire the shape of a screwdriver whenhandles 10 are latched together by latch 11. This shape facilitates twisting of the wires. In bothFIG. 3 andFIG. 4 the latch 11 is released by sideways pressure on the handles. Another advantage of the latch is that the piece of wire that beaks off stays locked in the tool and can not accidentally drop into an undesired spot. Such a tool can also be made as a disposable tool, where onlyjaws 5 are made of high quality materials, such as type 440 stainless steel, while the rest of the tool is made of bent sheet metal or molded filled plastic. -
FIG. 5 shows a close up view of the controlled break-off. The twisted part ofwires 2 breaks at theedge 5A ofjaws 5 intosection 3A which securesobjects section 3B which remains locked injaws 5. Because of the high pressure ofjaws 5section 3B has a slightly reduced cross section ofwire 2, causing the wires to break exactly atedge 5A ofjaw 5. Both the pressure and shape ofedge 5A are important and have to be determined experimentally for each wire size. Theedge 5A ofjaw 5 has to be rounded with a very small radius, typically 0.05 mm to 0.2 mm. The hardness ofjaws 5 in the areas coming in contact with thewire 2 has to be at least 60 Rc because of the very high local pressure. The ends ofjaws 5 coming in contact with the wire can be flat or slightly concave. The concave jaws tend to center the wire in the jaw. Because the pressure and shape of the tip of the jaws are quite critical and depend on the exact wire size, it is best to have a separate non-adjustable tool for each size of wire.Handles 10 are squeezed together until the tool locks at the correct setting. The snap action of the tool gives clear tactile feedback to the user. - While the preferred embodiment controls the break point by compressing the wire the invention should be understood to cover any method of controlling the break point of the wire.
Claims (9)
1. A method for securing objects using a wire comprising of:
wrapping wires around said objects; and
gripping ends of said wires and twisting then together in a manner causing said twisted wires to break off in a predictable break-off point.
2. A method as in claim 1 wherein said predictable break off is achieved by griping said wires using a tool generating a predictable and repeatable pressure.
3. A method as in claim 1 wherein said wires are gripped using a locking tool having hard jaws and said break-off point is at the edge of said jaws.
4. A tool for twisting together wires used for securing objects, said tool gripping said wires in a manner causing the twisted wires always to break off at the tip of said tool.
5. A tool as in claim 4 wherein said tool being in the shape of locking pliers.
6. A tool as in claim 4 wherein said tool being in the shape of a screwdriver.
7. A tool as in claim 4 wherein said tool comprises a snap action mechanism set for a particular wire size.
8. A tool as in claim 4 wherein said tool is disposable.
9. A tool as in claim 4 having jaws shaped to generate a centering action when gripping said wires.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/717,034 US20080223475A1 (en) | 2007-03-13 | 2007-03-13 | Method for securing objects using wires |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/717,034 US20080223475A1 (en) | 2007-03-13 | 2007-03-13 | Method for securing objects using wires |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080223475A1 true US20080223475A1 (en) | 2008-09-18 |
Family
ID=39761456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/717,034 Abandoned US20080223475A1 (en) | 2007-03-13 | 2007-03-13 | Method for securing objects using wires |
Country Status (1)
Country | Link |
---|---|
US (1) | US20080223475A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108136481A (en) * | 2015-05-25 | 2018-06-08 | 优素福·尼迈 | Bore attachment |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3959960A (en) * | 1975-03-12 | 1976-06-01 | Santos Manuel V | Tensioning, twisting and cutting device for sutures |
US4392494A (en) * | 1979-02-14 | 1983-07-12 | Ashby Richard L | Ligature tying instrument |
US5361809A (en) * | 1993-04-29 | 1994-11-08 | Chan Ts Ang Chi | Binding apparatus |
US5542843A (en) * | 1995-03-22 | 1996-08-06 | Price; Michael T. | Rotatably driven autoclavable ligation instrument |
-
2007
- 2007-03-13 US US11/717,034 patent/US20080223475A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3959960A (en) * | 1975-03-12 | 1976-06-01 | Santos Manuel V | Tensioning, twisting and cutting device for sutures |
US4392494A (en) * | 1979-02-14 | 1983-07-12 | Ashby Richard L | Ligature tying instrument |
US5361809A (en) * | 1993-04-29 | 1994-11-08 | Chan Ts Ang Chi | Binding apparatus |
US5542843A (en) * | 1995-03-22 | 1996-08-06 | Price; Michael T. | Rotatably driven autoclavable ligation instrument |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108136481A (en) * | 2015-05-25 | 2018-06-08 | 优素福·尼迈 | Bore attachment |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |