EP1991152A1 - Instrument pour mesurer la stabilite d'une colonne vertebrale - Google Patents

Instrument pour mesurer la stabilite d'une colonne vertebrale

Info

Publication number
EP1991152A1
EP1991152A1 EP07723048A EP07723048A EP1991152A1 EP 1991152 A1 EP1991152 A1 EP 1991152A1 EP 07723048 A EP07723048 A EP 07723048A EP 07723048 A EP07723048 A EP 07723048A EP 1991152 A1 EP1991152 A1 EP 1991152A1
Authority
EP
European Patent Office
Prior art keywords
legs
freedom
instrument according
instrument
measuring device
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.)
Withdrawn
Application number
EP07723048A
Other languages
German (de)
English (en)
Inventor
Arnold Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cervitech Inc
Original Assignee
Cervitech Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cervitech Inc filed Critical Cervitech Inc
Publication of EP1991152A1 publication Critical patent/EP1991152A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4657—Measuring instruments used for implanting artificial joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1071—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring angles, e.g. using goniometers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A61B2090/061—Measuring instruments not otherwise provided for for measuring dimensions, e.g. length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A61B2090/067—Measuring instruments not otherwise provided for for measuring angles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4528—Joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6867—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive specially adapted to be attached or implanted in a specific body part
    • A61B5/6878—Bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4657—Measuring instruments used for implanting artificial joints
    • A61F2002/4658—Measuring instruments used for implanting artificial joints for measuring dimensions, e.g. length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4657—Measuring instruments used for implanting artificial joints
    • A61F2002/4668—Measuring instruments used for implanting artificial joints for measuring angles

Definitions

  • the invention relates to an instrument for measuring the stability of the cervical spine.
  • cervical prostheses which essentially consist of two end plates to be connected to the adjacent vertebrae with an intermediate joint piece.
  • This type also known as a so-called "constrained" prosthesis, is used in particular with a low stability of the spinal column.
  • the invention is based on the object to provide an instrument for measuring the stability of the cervical spine, which avoids the above-mentioned disadvantages and is usable intraoperatively.
  • the solution according to the invention lies in the features of the independent claim. Advantageous developments are the subject of the dependent claims.
  • an instrument for measuring the stability of the cervical spine provides that it has two legs, each with a contact plate on one and an actuator at an opposite end, wherein the legs relative to each other in at least one translational and a rotational degree of freedom about a hinged Coupling are movable such that an axis of the translational degree of freedom and a pivot point of the rotational degree of freedom are in the region of the contact plates.
  • the core of the invention is to provide such a coupling, which allows both a rotational and a translational movement between the contact plates.
  • the legs By means of the actuating member, the legs can be moved longitudinally relative to each other or angularly moved relative to each other about a pivot point in the area of the contact plates.
  • the contact plates are respectively in contact with their outwardly facing surface on the upper and lower side of the lower or upper adjacent vertebral body. With the two contact plates, the instrument can be inserted into the intermediate space, which has been freed from a defective intervertebral disc, between the adjacent vertebral bodies of the cervical spine in which a joint prosthesis is to be implanted.
  • the surgeon is thus allowed to determine both the flexibility and stability of the cervical spine with respect to a translational movement in the plane of the contact plates, in which the legs are moved relative to each other in AP and / or in the lateral direction, as well as the static Cervical spine mobility with respect to a rotational movement, such as occurs when nodding or stretching the head (flexion or extension). From these two measurements, the surgeon can get an idea of the stability.
  • the measurement takes place exactly between the two vertebrae, between which the joint prosthesis is to be used. It is therefore measured exactly at the intended implantation site. Next, the measurement is carried out after the opening of the surgical site and clearances of the intervertebral space, the joint capsule and possibly access obstructing bands are removed.
  • the measurement can thus be carried out intraoperatively, under exactly the same conditions as apply to the joint prosthesis to be used.
  • a deterioration in the stability of the cervical spine as may occur, for example, by the removal of ligaments, are taken into account in this way.
  • the surgeon With the instrument according to the invention, the surgeon thus receives valuable measures for the stability of the cervical spine. Based on this, he can decide during the operation whether to implant a joint prosthesis with full or limited freedom of movement.
  • the instrument according to the invention thus combines advantages with respect to intraoperative application with high accuracy, locally resolved precisely at the implantation site.
  • the contact plates preferably have a similar design as end plates of the prosthesis to be implanted.
  • the contact plates are expediently aligned parallel to one another. Conveniently, there is one
  • Interface between the contact plates in a median plane of the instrument, and the relative longitudinal mobility of the legs lies in a second plane (sagittal plane), the is perpendicular to the median plane and intersects it in a longitudinal axis of the instrument.
  • the sagittal plane is also a tangential plane of the rotational degree of freedom. This allows a measurement in the two degrees of freedom mentioned.
  • the articulated coupling can be designed for the direct or indirect connection of the two legs.
  • indirect is meant here that the connection is guided over adjacent vertebral bodies.
  • a pivot bearing of the articulated coupling can be formed via adjacent vertebrae, with the contact plates, in the inserted state, lying non-rotatably against the vertebral bodies.
  • the pivot bearing is designed so that its axis of rotation is transverse to the longitudinal axis of the instrument in the median plane, so the axis intersects, along which the translational movement takes place. This applies regardless of whether the pivot bearing indirectly via vertebral body or directly as a structural element, such as a pivot pin is executed.
  • the articulated coupling expediently comprises a longitudinal bearing with guide surfaces along the longitudinal axis.
  • a guide for a longitudinal displacement of the two legs is achieved relative to each other. It is particularly expedient to carry out the longitudinal and the pivot bearing combined.
  • the instrument according to the invention is expediently provided with a respective displacement and a rotation measuring device. Conveniently, it is arranged on the legs.
  • the displacement measuring device is formed as a scale on one of the legs and as an index, preferably with a vernier, on the other of the legs. This can be obtained in a simple manner, a quantitative measure of the slidability in the longitudinal direction.
  • a rotation measuring device on one of the legs a concave curved to the contact plates scale and be provided on the other leg a secondary index. It has proven useful to arrange the secondary index on an arm, which is guided in a slot of the scale. This can be prevented in a simple way an undesirable divergence of the legs.
  • the contact plates are preferably provided with ribs on their abutting against the vertebral bodies surface. Thus, they are protected against unintentional displacement relative to the vertebral bodies. Measurement errors, as might occur, for example, in the measurement of longitudinal displacement, can be counteracted.
  • locking tabs are preferably provided, which are movable from a recessed into the contact plate rest position in a protruding locking position. In the locking position, the tabs engage in the bottom surface of the vertebral body, thus providing a firm hold.
  • the articulated coupling is developed such that the legs are movable relative to one another by a further rotational degree of freedom, and that an additional angle measuring device is provided.
  • the additional angle measuring device can be combined with the aforementioned angle measuring device.
  • the instrument according to the invention allows a measurement in three degrees of freedom.
  • a neutral position is expediently provided, from which the legs are movable either along the first rotational degree of freedom or the second rotational degree of freedom.
  • a combined movement is excluded.
  • FIG. 1 is a plan view of a first embodiment of an inventive instrument.
  • Fig. 2 is a side view of the instrument shown in Fig. 1;
  • Fig. 3 is a side view in a translational movement
  • Fig. 5 is a front view of the extension movement shown in Fig. 4;
  • Fig. 6 is a detail view corresponding to Figure 5 for a second embodiment of the invention.
  • Fig. 7 shows two illustrations of guide surfaces according to the first and second embodiments.
  • the illustrated in Fig. 1 first embodiment of an inventive instrument comprises two main legs as two legs 1, 2. Both are largely the same in their basic structure, but differ in terms of ele- ments of an angle measuring device, which will be explained in more detail below. The structure of the legs 1, 2 will be explained in more detail below using the example of the leg 1.
  • the leg 1 comprises a shaft 10, at the front end of a contact plate 11 and at the rear end of a handle 18 is arranged.
  • the shaft 10 has an approximately rectangular cross section with an upper side, a lower side and two side surfaces.
  • a length measuring device 7 is applied at the top of a scale 71 .
  • the contact plate 11 connects.
  • the contact plate 11 has only about half the strength, but about twice the width of the Shank 10 on. It is formed on its outside (which is preferably flush with the underside of the shaft 10) for contact with an end face of an adjacent vertebral body 9. For this purpose, its surface has a plurality of ribs 12. In the region of the transition between the contact plate 11 and the shaft 10 is a transverse to a longitudinal axis 8 of the instrument extending stop flange 13 is provided. It serves to limit the insertion depth of the instrument with its contact plates 11, 21 in the space between two adjacent vertebrae 9.
  • the handle 18 is formed from a round wire material with a hook at the end.
  • a locking device 6 is arranged on the legs 1, 2 each have a locking device 6 is arranged.
  • the locking device 6 of the leg 2 is shown.
  • It comprises a groove-like depression 60 incorporated in the underside of the shank 20. This groove extends essentially parallel to the longitudinal axis 8, with two 90 ° bends 61, 62 at the ends.
  • the rear bend 62 terminates in the side surface of the shaft 20.
  • a double-angled rigid wire 65 is introduced in the recess 60. He is by means of a screw 64 captive, but rotatable in the Ausne secured 60.
  • the wire 65 has wing-like bends at its two ends.
  • the front bend is formed as a locking blade 66.
  • the rear projecting wing is formed as a handle. By means of it, the surgeon can actuate the wire so that the locking tab 66 is in its rest position or in its locking position.
  • a similar Verriegelungseinrichung 6 is arranged in the leg 1, a similar Verriegelungseinrichung 6 is arranged. The two locking devices 6 can be operated independently of each other via the respective handle.
  • an angle measuring device 5 is arranged at the handle-side end of the femoral shaft 10. It essentially comprises a display unit 52 and an angle index 51.
  • the display unit 52 is fixed to the rear end of the
  • Leg 2 secured by a screw. It has a slot-like recess 56.
  • a scale 54 is arranged, which indicates an angular deflection relative to the longitudinal axis 8. The angular displacement is indicated by the angle index 51.
  • This is arranged on an arm 50 at the rear end side of the shaft 10 of the leg 1 such that it passes through the slot-like recess 56 and carries at its free end a pointing mark 53 (designed as a nose).
  • the pushed through the slot-like recess 56 arm 50 additionally causes a guide of the leg 1 on the leg 2. An undesirable divergence of the legs 1 and 2 is thus prevented.
  • the scale 54 of the Winkelmessein- Direction 5 can be easily deflected leg 1, the relative angular position between the legs 1 and 2 at the mark 53 of the angle index 51 read.
  • the two contact plates 11, 21 are separated by a common planar interface 81.
  • the interface lies in a plane with the longitudinal axis 8 and the handles 18 arranged centrally on the end faces of the legs 1, 2.
  • the contact plates 11 of the two legs 1, 2 are displaceable relative to each other.
  • lateral guide plates 15 are provided on the contact plates 11, 21.
  • the side surfaces of the legs 1, 2 are separated in a corresponding manner by a second planar interface, a Sagittalflache 82, from each other.
  • the side surfaces of the legs 1, 2 are formed such that the two legs 1, 2 relative to each other in this Sagittalflache 82 are movable.
  • the sagittal surface 82 is perpendicular to the interface 81, intersecting in the longitudinal axis 8 (see Fig. 7 a, b).
  • FIG. 3 shows how the two legs 1, 2 are moved starting from the normal position shown in FIGS. 1 and 2 in a translational degree of freedom (symbolized by a double arrow 91).
  • the instrument according to the invention is introduced in an intermediate space between two adjacent vertebral bodies 9.
  • the contact plates 11, 21 with their respective outer surfaces are applied to bottom surfaces of the vertebral bodies 9.
  • the ribs 12 and brought into their locking position locking tabs 66 the contact plates 11, 21 are fixed against slippage against the vertebral bodies 9.
  • the locking is done by the handle 65 of the locking devices 6 is actuated after insertion of the instrument, whereby the locking tab 66 pivots out of the contact plate 11, 21 and 9 engages in the bottom surface of the respective vertebral body.
  • the instrument is thus ready in its measuring position and for measurement.
  • FIG. 1 The measurement of the translational displacement is shown in FIG.
  • the legs 1, 2 are moved in the direction of the longitudinal axis 8 relative to each other. More specifically, the leg 1 is pulled to the rear (in Fig. 3 to the right).
  • the contact plates 11, 21 of the legs 1, 2 are displaced along the interface 81. Since the contact plates 11, 21 are connected to the adjacent vertebral bodies 9 in a non-slip manner via the ribs 12 and the locking tabs 66, the latter also become relative in this direction shifted to each other.
  • the caused by the respective force relative translational displacement of the vertebral bodies 9 can be determined, between which the contact plates 11, 21 are used.
  • the length measuring device 7 need not necessarily be designed mechanically as shown. Just as well, it can be provided that a sensor detects the relative longitudinal movement between the legs 1, 2 and outputs to a remote display. In general, it is the surgeon's feeling that the Force determines with which he acts the translational motion ⁇ . However, if a higher accuracy or a high reproducibility, for example, for reports, is desired, it can also be provided that between the handle 18 and the legs 1, 2, a force measuring device is arranged. Thus, the introduction of defined forces can be monitored.
  • the determination takes place with regard to a rotational degree of freedom (symbolized by a double arrow 92).
  • a rotational degree of freedom symbolized by a double arrow 92.
  • this is illustrated by the example of the extension of the spine.
  • the legs 1, 2 do not become along the
  • the angular deflection resulting from the introduction of a specific force (or a torque) can be determined by means of the angle measuring device 5.
  • the operator With the determination of the stability of both by a trans ⁇ latowitz movement 91 (see Fig. 3) as by a rotational movement 92 (see Fig. 4), the operator in a simple way the stability of the spine focused on the surveyed floor between the two adjacent Determine vertebral bodies 9. This happens intraoperatively. Changes to the spinal column that are required as part of the operation, in particular the section of ligaments, are thereby taken into account.
  • the instrument according to the invention allows both an accurate as well as a spatially focused measurement.
  • the side surfaces of the shafts 10, 20 function as guide surfaces (see FIG. 7).
  • these surfaces are designed as planes (see Fig. 7a). But it can also be provided that they are performed rounded (see Fig. 7b). The latter embodiment offers the additional advantage of allowing a second rotational degree of freedom.
  • a second embodiment of the instrument according to the invention has an additional rotational degree of freedom 93.
  • This rotational degree of freedom 93 allows a rotation about the longitudinal axis 8 (the actual axis of rotation is usually slightly offset from the respective handle 18).
  • the angle measuring device 5 is developed such that it has a second Winkelmessein- direction for the second rotational degree of freedom 93.
  • There is a second slot-like recess 57 is provided. It is formed like a circular arc and cuts the already mentioned slot-like recess 56 for the first rotational degree of freedom 92 in the region of a neutral position 59.
  • a second scale 58 is arranged on the circular arc-shaped, slot-shaped recess 57.
  • a tilting angle of the instrument according to the invention can be read off it by means of the angle index mark 51.
  • the position of the index mark 51 shown in FIG. 6 is the neutral position 59.
  • the instrument can be moved both along the first and also along the second rotational degree of freedom 92, 93, ie along the slide-like recess 56 or 57. Is the
  • Fig. 7 b the design of the side surfaces of the legs 1, 2 is shown for the second embodiment.
  • the sagittal surface 82 is unchanged from the first embodiment.
  • the side surfaces of the leg shanks 10, 20 are not flat, but convexly rounded ' . This enables a mutual tilting of the legs 1, 2. In this way, the stability of the spinal column with respect to lateral tilting movements can be determined. This gives the surgeon an additional parameter for determining stability. The certainty of determination increases.
  • the invention can be summarized as follows.
  • the invention relates to an instrument for measuring the stability of the cervical spine. It has two legs 1, 2, which are connected by means of an articulated coupling such that they are movable both translationally as well as in a rotational degree of freedom to each other. There are measuring devices 5, 7 provided to the respective deflection in the translational or rotational movement determine.
  • the instrument has at its front end contact plates 11, 21, which are designed for engagement in a vortex gap. By moving the legs 1, 2 of the instrument relative to one another, the vertebral bodies 9 are displaced or tilted relative to one another via the contact plates 11, 21. As a result, the surgeon can easily and reproducibly determine the stability of the cervical spine in the area of these adjacent vertebral bodies 9.

Abstract

L'invention concerne un instrument pour mesurer la stabilité de la colonne vertébrale, lequel présente deux branches (1, 2) respectivement munies d'une plaque (11, 21) de contact à insérer dans un espace intermédiaire entre deux corps vertébraux voisins à une extrémité et un organe (18) d'actionnement à une extrémité opposée, les branches (1, 2) étant mobiles l'une par rapport à l'autre dans au moins un degré de liberté translatoire et un rotatoire par le biais d'un accouplement articulé de telle sorte qu'un axe du degré (91) de liberté translatoire et un point de rotation du degré (92) de liberté rotatoire se trouvent dans la zone des plaques (111) de contact. Grâce à cet accouplement, il est possible de déterminer aussi bien la souplesse ou la stabilité de la colonne vertébrale par rapport à un mouvement translatoire dans le plan des plaques de contact, lors duquel les branches sont déplacées l'une par rapport à l'autre dans le sens antérieur/postérieur et/ou dans le sens latéral, que la stabilité de la colonne vertébrale par rapport à un mouvement rotatoire tel qu'il se produit, par exemple, lors d'un hochement ou d'un allongement (flexion ou extension) de la tête.
EP07723048A 2006-03-06 2007-03-06 Instrument pour mesurer la stabilite d'une colonne vertebrale Withdrawn EP1991152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202006003484U DE202006003484U1 (de) 2006-03-06 2006-03-06 Instrument zur Messung der Stabilität der Halswirbelsäule
PCT/EP2007/001902 WO2007101652A1 (fr) 2006-03-06 2007-03-06 INSTRUMENT pour mesurer la stabilité d'une colonne vertébrale

Publications (1)

Publication Number Publication Date
EP1991152A1 true EP1991152A1 (fr) 2008-11-19

Family

ID=36442313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07723048A Withdrawn EP1991152A1 (fr) 2006-03-06 2007-03-06 Instrument pour mesurer la stabilite d'une colonne vertebrale

Country Status (4)

Country Link
US (1) US20090163925A1 (fr)
EP (1) EP1991152A1 (fr)
DE (1) DE202006003484U1 (fr)
WO (1) WO2007101652A1 (fr)

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US9084688B2 (en) * 2009-05-19 2015-07-21 DePuy Synthes Products, Inc. Dynamic trial implants
DE102011117724B4 (de) 2011-11-07 2018-09-13 Omar Omar-Pasha Vorrichtung zur Abstützung einer Wirbelsäule im Bereich der Querfortsätze von zwei benachbarten Wirbeln
CN108836340A (zh) * 2018-05-16 2018-11-20 江苏艾迪尔医疗科技股份有限公司 切口测量器
CN109009136B (zh) * 2018-08-30 2024-03-22 中国人民解放军第二军医大学第二附属医院 一种新型的椎间测量器

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WO2007101652A1 (fr) 2007-09-13
DE202006003484U1 (de) 2006-05-04

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