KR20020062704A - A position-adjustment system for an instrument for surgery of the spine - Google Patents

Abstract

PURPOSE: Provided is a position-adjustment system for instrumentation for surgery of the spine, which system is put into place precisely and quickly. CONSTITUTION: A position-adjustment system for a surgical instrument in particular for surgery of the spine comprises: an elongate member(2) suitable for being connected to a first element of the instrument; a body suitable for being fastened to the elongate member and for being connected to a second element of the instrument; a connection device for connecting the elongate member to the body and arranged to have an unlocked state in which they allow the elongate member(2) to slide relative to the body and a locked state in which they prevent the elongate member(2) from sliding relative to the body.

Description

A POSITION-ADJUSTMENT SYSTEM FOR AN INSTRUMENT FOR SURGERY OF THE SPINE}

The present invention relates to an adjustment system of surgical surgical instruments for use in spinal column.

In the event of trauma, simple or complex fractures of one or more vertebral bones in the spine are corrections applied to return the spine to its original shape, especially with respect to curvature involving lordosis and kyphosis. Various configurations can be generated that require movement. Special tools are used for this purpose to enable recovery in cooperation with the bone bonding system, which is distinct from other cases. German patent G-91-12 466.2 describes a mechanism comprising an adjusting system having a threaded rod with two opposing threads located on either side of the drive means. Each thread engages a hole in the female thread groove of the body connected to the element of the instrument. The operation of such a system is long because of the pitch of the threads, and also because of the fact that the surgical glove contacts the thread with sharp edges that can hold or tear the glove during operation, also due to the fact that additional attention is required. This prolongs the time required for the procedure, which is very harmful to the patient.

It is an object of the present invention to provide an adjustment system for spinal surgical instruments that can be accurately and quickly positioned.

In order to implement this, according to the invention there is provided a positioning system of a surgical, in particular spinal, surgical instrument, the system being fixed to a stretching member, the stretching member and adapted to be connected to a first element of the instrument. Connecting means arranged to a body suitable for connection to a second element of the body and to the body, in an unlocked state allowing the stretching member to slide relative to the body and in a locked state to prevent the stretching member from sliding against the body; It is provided.

Thus, while it is possible for the locked state to be fixed quickly at the selected position, in the unlocked state it is possible to adjust the position simple, accurate and fast. Thus, such a system can be operated simply, accurately and quickly.

Preferably, the connecting means is arranged to prevent the stretching member from slipping with respect to the body by the wedging effect.

Preferably, the connecting means has at least one elastically deformable element.

Preferably, the deformable element is suitable to meet the wedge effect.

Preferably, the system is arranged in such a way that in the locked state the sliding is fixed in a single direction.

Preferably, the deformable element represents the bearing surface and the elongate member represents a contact surface suitable for contacting the bearing surface in the locked state.

The length member thus carries a deformable specimen on the deformable element without any intervention by the operator towards the locked position due to the contact between the contact surface and the bearing surface. The operator does not act on the deforming element and therefore the operator's hand does not touch the sharp edge. Therefore, there is no risk of damage or tearing of the gloves during surgery.

Preferably, the contact surface is smooth and a lock is obtained by friction.

Preferably, the contact surface is node.

Preferably, the bearing surface comprises a node.

Preferably, the contact surface provides a recess, in particular a groove.

Preferably, the bearing surface has a protrusion adapted to be received in the recess.

Preferably, the deforming element is divided into all or part of the length of the element.

Preferably, the deformable element has a deformable tongue at one end.

Preferably, the deformable element has an end that satisfies the loosening.

Preferably, the deformable element is conical.

Preferably, the end that satisfies the release comprises a bearing rim.

Preferably, said connecting means comprise a second elastically deformable element.

Preferably, the second deformable element is suitable to prevent slipping when displaced in the other direction.

Preferably, the second deformable element is a mirror image of the first deformable element.

Preferably, the body can be disassembled into at least two parts.

Preferably, the body comprises means, in particular a ring, for interconnecting the two parts.

The present invention also provides an orthopedic, in particular spinal column surgical instrument comprising a positioning system having at least one of the above features.

Other features and advantages of the invention appear in the description of the following examples.

1 is an overall cross-sectional view of an embodiment of the present invention.

2 is an exploded perspective view of the embodiment of FIG. 1 excluding the rod;

3A is a perspective view of a deformable element of the embodiment of the invention of FIG. 1.

3B is a cross-sectional view of the III-III view seen through the deformable element of FIG. 3A.

4A is a perspective view of a fragment of the body of the embodiment of the invention of FIG. 1.

4B is a cross-sectional view on IV-IV of the body portion of FIG. 4A.

5 and 6 are cross-sectional views of the embodiment of FIG. 1 in operation.

7 is a schematic diagram of using the embodiment of FIG. 1 in surgery.

<Brief description of the symbols in the drawings>

1: position adjusting system 2: extending member

3: hollow body 4, 6: half cell

8, 10: deformation element 12: ring

14: bearing edge 30: tongue

38: protrusion 62: recess

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the positioning system 1 slidably receives the rod 2 of the circular portion together with a pair of elastically deformable elements 8, 10 each having a circular plate 14 fixed at one end. It is provided with a hollow body (3) suitable for.

The hollow body 3 has half-shells 4, 6 interconnected by rings 12. The half cell 6 is a mirror image of the half cell 4 with respect to the surface perpendicular to the rotation axis A of the main body 3. Only one half cell is described in detail.

2, 4A and 4B, the half cell 4 has a through hole 18 extending along the rotation axis A. As shown in FIG. The half cell 4 has an outer surface 61 and two axial end surfaces 34 and 60. The end face 60 joins the outer face 61 through the circular surface 26. The portion of the outer surface 61 is replaced by a plane 48 parallel to the axis of rotation A. The female threaded hole 50 passing through a radius perpendicular to this plane 48 is opened out inside the hole 18. The hole 18 is composed of a plurality of positions. The cylindrical first portion of the circular portion defined by surface 52 exhibits a first diameter, and the cylindrical second portion of the circular portion defined by surface 54 represents a second diameter that is greater than the diameter of the first portion. The through hole 50 is open into this part. The third portion is defined by the cylindrical surface 58 itself of the circular portion and is in the form of a truncated conical surface 56 extending to cause expansion of the aperture 18 from the diameter of the second portion to the diameter of the fourth portion. . It will be described below that the surface 56 forms a bearing surface.

The ring 12 for interconnecting the two symmetric half cells 4 and 6 has a cylindrical outer surface 22 that is generally the same diameter as the diameter of the fourth portion of each of the half cells. The ring 12 also provides a cylindrical inner surface 20. The length of the ring 12 is equal to twice the width of the fourth portion of each of the half cells 4 and 6.

The main body 3 is formed as follows. The ring 12 is inserted into the fourth portion of the hole 18 of the first half cell. Since the ring is twice the width, if the ring 12 is placed in the first half cell, it protrudes from the surface 34 of the present half cell. Thereafter, the second half cell is engaged with the ring 12 until the face 34 bears against the face 34 of the first half cell. Thus, the main body 3 is completely formed. While the ring is used at the time of operation, the ring remains detachably between the two actuators so that the instrument can be completely disinfected by the operating room nurse, but the ring is forcibly fixed to be held together with the body 3. In that way the outer diameter of the ring 12 of each half cell and the inner diameter of the fourth part are selected. For even more robust assembly, link elements (not shown) may optionally be used to be secured by threaded members (not shown) suitable for engaging the tapping of the respective half cell 4 and 6 holes 50 and The link element is suitable to bear against the plane 48.

2, 3A and 3B, the deforming elements 8 and 10 will be described. The element 10 is a mirror image of the element 8 with respect to the plane perpendicular to the axis of rotation A of the element. Therefore, only one of the two elements is described. The elastic deformation element 8 has two recesses 32 and 33. The general shape of the deforming element 8 is tubular. The recess 32 represents the first cylindrical surface 42 by the first diameter and the second cylindrical surface 44 by the second diameter which is slightly larger than the diameter of the surface 42. The recess 32 forms a complete circle around the deformable element 8 and is separated from the recess 33 of the deformable element 8 by a concave groove 36 which occupies a plane perpendicular to the axis. The recess 33 of the deforming element 8 consists of a plurality of tongues 30 evenly distributed over the entire circumference of the deforming element 8. In this case, there are eight tongues 30. Each tongue 30 is separated from the next tongue by a slot 46 extending from the groove 36 of the deforming element 8 to the free axis end of the recess 33. In the groove 36, each slot 46 becomes a circular through hole 40. At the free end of the recess 33 of the deforming element 8, each tongue 30 extends with an outer radius with respect to the deforming element 8 and ends with a protrusion representing the conical surface 28. At the free end, still, the face 28 opposite each tongue has convex protrusions, preferably circular portions, extending towards the inner radius of the deforming element 8. As will be explained below, the recess 33 is the part of the element 8 which deforms in use. This deformation is due to each tongue suitable for inherent deformation near the groove 36.

The diameter of the surface 44 is approximately the same as the diameter of the first portion of the hole 18 defined by the surface 52. The diameter of the surface 42 is generally the same as the diameter of the hole 16 in the plate 14 briefly described below.

The plate 14 constitutes each ring represented by a through hole 16 and a circular outer rim 24. The plate 14 is suitable for mounting to the recesses 32 of the respective deformable elements 8 and 10 to cover the surface 42.

Referring to FIG. 1, the stretching member 2 suitable for being accommodated inside the main body 3 is a circular partial rod on the rotation axis A, and has a plurality of circumferential grooves 62 uniformly distributed along its entire length. Indicates. This groove 52 is a circular part.

The following describes how the positioning system is assembled. The first deformable element 8 is inserted in contact with the surface 52 in such a way that the surface 4 occupies, for example, the first part of the hole 18. Thereafter, the first plate 14 may be forcibly fixed to the recess 32 of the first deforming element 8 in such a way that the hole 16 of the plate 14 receives the surface 42 of the deforming element. Mounted together. Thereafter, the ring 12 is forcedly inserted into the fourth portion of the hole 18 of the half cell in such a way that the surface 22 contacts the surface 58. Thereafter, the second deformable element 10 is inserted into the second half cell 6 in the same way that the deformable element 8 is inserted in the first half cell 4, and then still in the same way. The second plate 14 is suitably positioned on the recess 32 of the deforming element 10. As a result, the second half cell 6 is inserted into the ring 12 so that the whole covers the main body 3. In each half cell, since each surface 28 is suitable for contacting the surface 56 of the hole 18, each deformable element has one end due to the presence of the plate 14 on the recess 32. And by the presence of a protrusion having a surface 28 at the end of the tongue 30. Next, when the plate 14 contacts the rear face 60 of the half cell, the surface 28 of each tongue 30 is separated from the surface 56 of the half cell. Conversely, when the surface 28 of each tongue 30 contacts the surface 56 of the half cell, the plate 14 is no longer in contact with the surface 60 of the half cell. As a result, in use, the stretching member 2 is then inserted into the assembled assembly as described above.

The operation of the position adjustment system 1 will be described below with reference to FIGS. 5, 6 and 7. The vertebral column has vertebrae V3, which represent complex fractures. The vertebrae V3 are coupled to two healthy vertebrae V1 and V2 on either side via the vertebral discs I1 and I2. The elongate member 2 is connected with the element E2 of the surgical instrument engaged with the vertebrae V1, while the body 3 is connected with the second element E1 of the same surgical instrument with the vertebral bone V2. Suppose it is. The direction for moving the stretching member 2 in the arrow direction F 'is explained with reference to FIG. For this reason, the operator exerts a force F on the plate 14 connected to the deforming element 8. This force F is brought into contact with the surface 60 and the plate 14 of the half cell 4 of the body 3 and with the surface 56 of the half cell corresponding to the surface 28 of the blade 30. The deformable element 8 is movable so that it is no longer in contact. The circular projection 38 meshes with the groove 62 of the stretching member 2. The other deformable element 10 has a projection 38 that engages another groove 62 of the elongate member 2. When a force F is applied to the first plate 14, each blade surface 28 of the second deformable element 10 contacts the surface 56 of the half cell 6. As a result, the second plate 14 connected to the second deformable element 10 withdraws from the surface 60 of the second half cell 6. Thereafter, the stretching member 2 is moved in the arrow direction F '. The protrusions 38 of the first deforming element 8 escape from the grooves 62 because the projections 38 and the grooves 62 are circular and the outward movement of the various tongues 30 deforming the grooves 36 inherently. Thus, the stretching member 2 is released from the deforming element 8. At the same time, the stretching member 2 drags the second deforming element 10 to move in the direction D. FIG. Surface 28 is then no longer in contact with face 60 of half cell 6. When the second plate 14 is in contact with the face 60 of the half cell 6, this drag is over. For the same reason with respect to the first deformable element 8, the elongate member 2 is disengaged in the same way from the second deformable element 10, since the projection 38 and the groove 62 are circular. to be. Thereafter, the operator can cause the stretching member 2 to slide with respect to the main body 3 in an arrow direction F 'over an arbitrary distance.

If the stretching member 2 reaches the desired position, the operator stops applying the force F that has been added to the first plate 14. The blade 30 of the deformable element 8 then closes as soon as the projection 38 engages the first effective groove 62. The stretching member 2 continues to move in the direction of the arrow F ', and the stretching member 2 has the surface 28 of each tongue 30 of the deforming element 8 being the surface of the half cell 4. The deformable element 8 is attracted until it comes in contact with 56, whereby the projection 38 in the groove 62 under the force D ′ generated by the contact between the surface 56 and the surface 28. The assembly is locked into position to hold.

Symmetrically, by operating the second plate 14 in the same manner as described above, the operator can move the stretching member 2 in the direction opposite to the arrow F '.

Similarly, by simultaneously operating both plates 14 as described above, the operator can move the main body 3 in either direction at any distance along the elongate member 2 such that the main body 3 is positioned at any desired position. Can cause slipping.

Of course, various modifications of the invention can be made without departing from the scope of the invention.

For example, the groove 62 of the elongate member 2 may be replaced with a nodal or smooth surface. Under such circumstances, the deformable element may have a nodal surface instead of the protrusion 38. After this, locking of the position by friction can be obtained.

While the present invention allows the locked state to be fastened in the selected position, it is possible to obtain a device in which the unlocked state is simple, accurate and allows for quick adjustment of the position, which device is simple, accurate and Can be operated quickly.

Claims (22)

Position of the surgical, in particular spinal, surgical instrument having an elongate member 2 adapted to be connected to the first element of the instrument and a body 3 fixed to the elongated member and adapted to be connected to the second element of the instrument In the adjustment system, the stretching member slides with respect to the main body and an unwinding state that connects the stretching member 2 to the main body 3 and allows the stretching member 2 to slide (F ') with respect to the main body 3. Positioning system for surgical, in particular spinal surgery instruments, characterized in that it has connecting means 8, 10 arranged in a locked state to prevent it from being pulled out. The method of claim 1, And said connecting means is arranged to prevent the stretching member from slipping with respect to the body by the wedge effect. The method according to claim 1 or 2, Said connecting means comprises at least one elastically deformable element (8, 10). Positioning system of a surgical, in particular spinal, surgical instrument. The method according to claim 2, wherein And said deformable element is adapted to meet the wedge effect. The method according to any one of claims 2 to 4, The system of claim 1, wherein the system is arranged in such a way that sliding is prevented upon displaced in a single direction in the locked state. The method according to any one of claims 3 to 5, The elastically deformable element represents a bearing surface 38 and the elongate member represents a contact surface 62 suitable for contacting the bearing surface in the locked state, in particular a surgical system, in particular a spinal surgical instrument positioning system. . The method of claim 6, The contact surface (62) is smooth and configured to be locked by friction, the positioning system of a surgical, in particular spinal, surgical instrument. The method of claim 6, Positioning system of the surgical, in particular spinal surgery instruments, characterized in that the contact surface (62) is knurled. The method according to any one of claims 6 to 8, The bearing surface (38) is characterized in that it comprises knurling. Positioning system of surgical instruments, in particular spinal surgery instruments. The method according to any one of claims 6 to 9, Said contact surface is provided with a recess (62), in particular a groove. The method of claim 10, The bearing surface has a projection (38) adapted to be received in the recess, wherein the positioning system of the surgical, in particular the spinal surgical instrument. The method according to any one of claims 3 to 11, wherein Wherein said deformable element is split into all or part of the length of the element. The method of claim 12, Positioning system of the surgical, in particular spinal surgery instruments, characterized in that the deformable element has a deformable tongue (30). The method according to any one of claims 3 to 13, The deformable element has an end portion (32) for satisfying disengagement. The method according to any one of claims 3 to 14, Positioning system of the surgical, in particular spinal surgery instruments, characterized in that the deformable element is generally conical. The method according to claim 14 or 15, Positioning system of the surgical, in particular spinal, surgical instrument, characterized in that the end (32) that satisfies the release comprises a bearing rim (14). The method according to any one of claims 3 to 16, Said connecting means comprises a second elastically deformable element (10). Positioning system of a surgical instrument, in particular a spinal surgery instrument. The method of claim 17, And said second deformable element is adapted to prevent slipping upon displaced in the other direction. The method of claim 17 or 18, Said second deformable element (10) is a mirror image of the first deformable element (8). The method according to any one of claims 1 to 19, Positioning system of a surgical, in particular spinal, surgical instrument, characterized in that the body (3) can be disassembled into at least two parts (4, 6). The method of claim 20, The body includes a means (12) for interconnecting two parts, in particular a ring, for positioning a surgical system, in particular a spinal surgical instrument. The method according to any one of claims 1 to 21, An orthopedic, in particular spinal column, surgical instrument comprising a position adjustment system.