WO1992007526A1

WO1992007526A1 - External bone fixing apparatus

Info

Publication number: WO1992007526A1
Application number: PCT/US1990/006225
Authority: WO
Inventors: Igor Klimov
Original assignee: Igor Klimov
Priority date: 1988-04-11
Filing date: 1990-11-02
Publication date: 1992-05-14

Abstract

An external bone fixating device for correcting bone deformation. The device comprises arched members (1, 2, 5) adapted to encircle a fractured body member, straight members (3, 4) adapted to connect with the arched members, and bone contacting members (8). The device further comprises connection members (6, 7 and 9-14) to connect the straight members to the arched members, and to connect the bone contacting members to the arched and straight members respectively, such that the device has continuous threaded adjustments around the arched members and along the straight members for controlled measured dosage.

Description

< EXTERNAL BONE FIXING APPARATUS

"New Yorker" Apparatus

This invention relates to means and methods of correcting bone deformation and, more particularly, to such means using external fixation.

Background

The proposed device is designed for use in traumatology and orthopedy in changing the shape of deformed bones; in lengthening the bones and in causing new growth of bone, skin, nerve tissue, blood vessels in deficient limbs, treatment of pseudo-arthrosis and osteomelitis, flesh fractures, open ultisplintered fractures with vast damage to bone and soft tissue.

The device has no contra-indications in treatment of adults and, especially, of children.

Prior Art, Disadvantages

All known previous external fixators are based on a principle of fixed connection between the ring and tension rod. They are as follows:

Bittner, 1936 ; Pat. USA 205502-4 ittmozer, 19-+8; Germany XXXVIII Zur Druckosteosynthese 229-231

Ilizarov, 1951, 197-4; Soviet Union Pat. USA U615338

Kalnberz, 197*1, 1976; Soviet Union Pat. USA 3977397

Fisher, 1982; Pat. USA -4308863

Monticelli-Spinelli, 1981, 1983; Italy

Hardy (Sequoia), 1990; France Pat. USA 890631

Jaquet, 1982; Switzerland Pat. USA -+36562-4

Cambras, 1986; Cuba Pat. USA -462U2-49

Hence, their general disadvantages are:

1. Bone fixators: wires and pins can only be immovably connected on the rings. There can be -4 to 8 rings in the device which can bring the weight of the device to 10-1*4 lbs.

2.- All types of devices lack full accurate adjustable rotation.

3. Dosage of movement of the wire inside the ring is not possible.

-4. For reposition, additional equipment and numerous re-assembly of device is needed.

5. Very labor consuming, especially in cases where rotation and reposition are necessary.

SUBSTITUTE SHEET 6. Factually, all contemporary devices are of fixation type.

7. The best of all contemporary devices, Ilizarov 197*4 is heavy (10-1^4 lbs), employs many details of various shapes and purposes, and is complicated in usage.

The most pertinent prior art known to Applicant is the Ilizarov device. However, Applicant's system has differences and advantages over the Ilizarov device.

Advantages

The proposed apparatus is multi-purpose and based on a new concept-moving connection between ring and tension rod. Applicant introduced for the first time: threaded arched member; and connectors with a measurable dosage of movement by means of nuts on circular and straight members.

This innovations give the device the following advantages over existing models:

1. Bone fixators-wires and pins are fixed on both the ring and tension rods which decreases weight of the device.

2. Wires and pins has a measurable dosage of movement.

3. The present invention permits full accurate mechanical adjustment of rotation is 36θ degrees which is an improvement over Ilizarov which requires manual adjustment of rotation.

•4. Dosage of movement of wire inside the ring is possible.

5. In case of reposition, no additional equipment is necessary.

6. Low labor' consumption in cases when rotation and reposition are necessary.

7. Device is simultaneously doing reposition, rotation and lengthening of the bone.

8. Applicant's system uses a minimum of parts. Device is easy in manufacturing and usage, lightweight (1.5-3 lbs), employs only -4 multi¬ purpose details as compared to -40 or more (l) in Ilizarov's device.

9. Pins and wires which support the bone may be mounted at different angles by use of head connector (olive).

10. The details employed in Applicant's device for reposition and rotation can also be used in other devices of similar purposes.

SUBSTITUTESHEET INVENTION

The invention provides means and methods of correcting bone deformation comprising arched members adapted to encircle a fractured body member, straight members are adapted to connect to arched members, bone contacting members, means to connect straight members to arched members and means to connect bone contacting members to arched and straight members.

Objects of the Invention

Accordingly, a principal object of the invention is to provide new and improved means and methods for correcting bone fractures.

Another object is to provide new and improved means for correcting bone deformation comprising arched members, adapted to encircle a fractured body member, straight members adapted to connect arched members, bone contacting members, means to connect straight members to arched members, and means to connect bone contacting members to arched and straight members, providing an adjustable frame for holding the bone ends in place, until they grow together.

Another object of the invention is to provide new and improved means, and methods for correcting bone deformation comprising apparatus wherein arched members are threaded, and wherein connecting members comprise olive members having first and second shaftways perpendicular to each other or three shaftways and means to clamp olive members to arched members, straight members and bone contacting members. Where olive connectors with two or three holes and nuts are assembled from two parts.

These and other objects of the invention will be apparent from the following specifications and drawings.

Brief Description of the Drawings

Figure 1 is a perspective view of an embodiment of the invention. Fig. 2 and 3 are perspective detail views of the olive type connecting members which are assembled from two parts.

Fig. -4 is a perspective view of a nut assembled from two parts.

SUBSTITUTESHEET Description of the Preferred Embodiments

Referring to the drawings, the invention comprises two arched members 1 and 2, which are adapted to encircle a body member, such as an arm or leg, for a fracture of bone B.

Two straight members 3 and -4, are connected to arched members. Arched members are threaded and may be 1/k OD threaded metal. The members 1 and 2 may be one piece members.

Arched member would have to have one side having reversed threads so that Nut 5 could bring the members together to form a continuous, preferably circular member.

The straight members 3 and h, are threaded metal rods, 1/-4 OD for instance, which are adjustably clamped to circular members 1 and 2. The frame may be polymers, eutectic, ceramic, nylon, etc. materials.

Bone contacting members 8 are passed through the bone on both sides of the fracture. These members are preferably stainless steel members. They are^*passed through the bone on either side of the fracture and clamped to circular members 1 and 2, and straight members 3 and -4 by means of olive connectors 6 and head olive 10.

Fig. 2 and 3 show detail views of a typical connecting olive shape member 12 and 13 having two or three shaftways which are perpendicular to each other. In the connection between the circular members and the straight members, the circular member would pass through one shaftway and the straight member through the other.

Referring to Fig.3, the olive connections 12, 13 etc. may be clamped to the straight member k by means of nuts 9, and may be clamped to the circular member 2, etc., by means of nuts 9«

Fig.-4 is a perspective view of a two part nut.

SUBSTITUTESHEET Operation of Invention

Note that all necessary adjustments from straight members to circular members may be made in the process of setting the fracture and then locked into place to hold the fractured bone ends in position. The procedure is as follows:

1. The bone contracting members 8 etc., are passed through the bone on both sides of the fracture. They would be in different planes and at different angles so as not to interfere with each other.

2. The frame comprising circular members and straight members are then positioned encircling the arm or leg and the circular members and the straight members are connected together loosely so that they can be adjusted.

3. The bone contracting members 8 etc., are then loosely connected to the circular members and to the straight members, by means of the olive connectors 6.

All of the above connections have to be loosely made so that they may be adjusted for setting the fracture and they are then clamped together permanently. Therefore, the present invention not only performs the function of fixation, but also assists in the repositioning and setting of the racture.

Once the members are clamped together permanently, the patient is free to walk if there is a leg fracture. The frame of the present invention is much lighter and more comfortable than other apparati.

The frame of the present invention may be applied with the use of a local anesthetic. Care should be taken to avoid the possibility of infection with conventional methods.

The apparatus performs:

1. Fixation - stabilization.

2. Reposition - in the setting of fracture(s).

3. Rotation of the bone to 180 and 36θ.

TE SHEET

Claims

It is Claimed

1. "New Yorker" apparatus comprising threaded arched members and connectors with a measurable dosage of movement by means of nuts on circular and straight members.

2. Where the connectors can be assembled from two parts.

3. Where the nuts can be assembled from two parts.

•4. Apparatus as in Claim 1 where connectors can have three holes perpendicular to each other.

5. Apparatus as in Claim 1 where connector is olive head.

SUBSTITUTE SHEET