DE7707950U1 - Wire tensioner for surgery - Google Patents

Description

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OSTEO AG, 2545 Selzach (Switzerland)

Wire tensioner for surgery

The present invention relates to a wire tensioner for
surgery, with an adapter sleeve, a tension spring and a
Tension handle and is used to tension a cerclage wire.

When fixing parts of the bone, a wire, a so-called |

Cerclage wire, placed around a part of the bone, stretched, bent |

or twisted and then broken off or by means of a §

cut through with a pair of pliers. There are already a large number of -

Wire tensioners are known, for example, one in which both \ wire ends after looping in a bore at the top

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7707950 1104.78

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of the instrument are introduced and fixed there, whereupon the wire is tensioned by means of a tensioning disc rotating on a thread and then twisted until the wire breaks. Bf; in this instrument it is difficult to measure the clamping force and can lead to the wire breaking in the wrong place, especially when twisted. The disassembly and cleaning This instrument is relatively cumbersome and the handling, if one takes into account the fact that the surgeon has gloves carries, ilt difficult.

Another wire tensioner consists of a sleeve with a milled recess, in which a handle with a hole transversely to the sleeve axis can be inserted. The wire is inserted through the hole and tensioned by turning the handle. Then the wire is kinked and cut off. Here, too, it is difficult to dose the clamping force and can, especially when buckling, lead to breakage of the wire. There is also the risk of the sleeve slipping off during work.

Finally, a wire tensioner is known which has a clamping sleeve, has a tension spring guided in a holder and a tensioning disk rotatable on a thread lying in the longitudinal axis. The tension spring causes after tensioning and during After twisting the wire, the tensioning force remains constant, but either the tensioning disk must be held and some locking mechanism must be operated. At the lead there are also notches that allow a reproducible machining

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This makes it easier for the surgeon to make notes in order to assign a particular notch to a particular wire. This device is very cumbersome to clean can also be used when handling and holding this instrument under operating conditions Difficulties arise.

It is an object of the present invention to provide a Specify wire tensioner with which one can easily dose the wire tension, at which the tension state of the wire is maintained at all times, which is easy to handle and can be held firmly so that it can slide off while working prevented and which can be easily and quickly dismantled to ensure good cleaning.

The wire tensioner according to the invention is used to solve this problem characterized in that a scale is attached to the clamping sleeve, which the front edge of the sleeve holder as Ztdger

the

is assigned, and that / on the slotted for receiving the wire, lying transversely to the longitudinal axis of the wire tensioner Shaft seated tension handle provided with a return stop is1

A preferred embodiment of the invention is characterized in that the pawl of the return inhibitor is one to the on the shaft of the cocking handle seated ratchet wheel engaging nose to secure the pull-out cocking handle.

In the following, the invention is based on the drawing of an Aus

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management example explained in more detail.

Fig. 1 shows, partially in longitudinal section, an inventive Wire tensioner,

FIG. 2 shows, partially in section, the wire tensioner from FIG. 1

and FIG. 3 shows, in a side view, a section of the Wire tensioner according to Fig. 1.

In Fig. 1 you can see the essential components of the wire tensioner, the housing 1, the clamping sleeve 2, the sleeve holder 3, the tensioning spring 4 and the tensioning handle 5 with the one slot 6 having Shaft 7. The clamping sleeve 2 has a hardened eyelet 9 with a small opening 8 at its lower end. the The eyelet 9 is screwed into the clamping sleeve and can therefore be easily exchanged. On the lower part of the adapter sleeve is a Engraved scale 10, which in the present case goes from 0 to 50 kp, since the wires used usually have a tensile strength of approximately 60 kp. In the central area, the clamping sleeve has a collar 11 on which the clamping spring rests on the one hand 4 and on the other hand, in the relaxed state, the holder 3 is supported, the part of the clamping sleeve lying above the collar in FIG the tension spring protrudes. The holder 3 is connected to the housing 4 by means of a bayonet lock 12, the closing effect is increased by the fact that the spring is already somewhat tensioned when it is closed and thus acts on the bayonet lock. So-

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Both the housing and the upper part of the case holder are square in order to ensure that the instrument is held firmly in place. This is especially important when you consider that the surgeon wears gloves and that these gloves are used during the operation can often be smeared.

The upper part of the housing has a go through transversely to the longitudinal axis Hole 7a for receiving the SpanngriffweHe and a milled recess 13 au The backstop 14 consists essentially of the ratchet 15 and C the pawl 17 under the action of the spring 16. The tooth of the ratchet wheel and the pawl are, as usual with such backstop, arranged such that the cocking handle in a Direction can be turned, while in the other direction the pawl blocks the ratchet wheel. The pawl 17 also has a nose 18 which engages around the ratchet wheel and thus the Secures the cocking handle from being pulled out. In order to be able to pull out the cocking handle, the pawl, which is rotatable about bearing 19, has to be against the pressure of the spring 16 connected to the pawl

Depress plate 20, thereby releasing the cocking handle. The wound wire 21 is also shown in FIG.

In order to perform a so-called single cerclage / the wire is turned around guided the bone and through an oes-a put through. The end of the wire is then pushed through the clamping sleeve and the housing and the slot in the clamping handle shaft and attached to the shaft by turning the tension handle. Through this, that the cocking handle can be easily removed and reinserted

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the insertion of the wire is made much easier. When clamping of the wire can: i the surgeon determine at any time the tension under which the wire is being tensioned can interrupt and the clamping force remains constant because of the return inhibition that acts immediately. The engraved Scale shows the surgeon how far he can go with the tensioning without tearing the wire. After tensioning, the Wire bent, it being advantageous if this Biec ^ radius is as small as possible. In the present case, this is achieved in that the eyelet 9 is designed in the shape of a beak. This one If the eyelet shows signs of wear and tear the quickest, it is advantageous if it can be easily replaced. With the so-called Double cerclage is the wire double around the bone laid and the two wire ends are through the wire and ansculiessend inserted through the adapter sleeve and onto the expansion shaft, tensioned and then twisted and cut off. In the When using the wire tensioner for this type of Cerclage, the eyelet opening must be elongated, advantageously oval, whereby the width may only be a little more than the wire diameter and the sleeve holder and the eyelet must be held so that they cannot rotate. It goes without saying that a holder designed in this way can also be used for single cerclages. To the surgeon To save unnecessary effort when tensioning, the tensioning handle is wing-shaped, the wings being relatively are long. Of great importance with surgical instruments is the ability to clean them quickly and easily. This fact is taken into account with the present wire tensioner

worn so that the individual essential parts can be easily dismantled are. As already mentioned, the cocking handle can go through with the shaft simple pressure on the plate can be taken out, whereby this fact plays a major role in removing the wire remnants, The cutout 13 also contributes to this. Furthermore, the clamping sleeve with the holder can easily be separated from the housing by means of the quick-release fastener and the tension spring can be removed.

Various details of the wire tensioner can also be designed differently.

j stalten. Any other scale can be engraved in this way.

be fourth and the arrangement of the pawl with its spring and the plate can also be designed differently. Instead of the ratchet catching around the ratchet wheel with its nose, the ratchet can wheel have a circumferential bead around which the pawl

j engages. In addition, the cocking handle does not need to have wings and can for example be equipped with a round, grooved button. Even if the square shape of the case and the Hülsenhaltererteiis offer particular advantages, these parts could also be designed, for example, six-sided.

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Claims (8)

- 8 claims for protection 1. Wire tensioner for surgery, with a clamping sleeve, ai Tension spring and a tension handle, characterized in that a scale is attached to the tensioning sleeve (2), the scale at the front Edge of the sleeve holder (3) is assigned as a pointer, and that tolerance seated on the shaft (7) slotted to receive the wire (21) and lying transversely to the longitudinal axis of the wire tensioner Tension handle (5) is provided with a return stop (14). 2. Wire tensioner according to claim 1, characterized in that the pawl (17) of the return inhibitor one to the on the Shaft of the cocking handle seated ratchet wheel (15) engaging nose (18) to secure the pull-out cocking handle. 3. Wire tensioner according to claim 1 or 2, characterized in that the clamping sleeve at its lower end has an 'exchangeable, hardened eyelet (9). 4. wire tensioner according to claim 3, characterized in that the eyelet is tapered. 5. Wire tensioner according to one of claims 1-4, characterized in that that the clamping sleeve is connected to the housing (1) by a quick-release fastener (12) (3) is held. 7707950 04/13, 78 · T · 9 * ™ · · «» til »»! • · · ■ · IJ 6. Wire tensioner according to one of claims 1-5, characterized in that that the housing and the sleeve holder have a square cross-section. 7. Wire tensioner according to one of claims 1-6 / for single cerclage, characterized in that the eyelet (9) has a round opening. 8. Wire tensioner according to one of claims 1-6, for; the Double- \ J and single-cerclage, characterized in that the eyelet has an elongated, preferably oval-shaped opening, and that the clamping sleeve and the eyelet are held rotationally fixed. 7707950 04/13/78