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WO1997005825A1 - Instrument de mesure de la rigidite du cartilage articulaire - Google Patents

Instrument de mesure de la rigidite du cartilage articulaire Download PDF

Info

Publication number
WO1997005825A1
WO1997005825A1 PCT/ES1996/000154 ES9600154W WO9705825A1 WO 1997005825 A1 WO1997005825 A1 WO 1997005825A1 ES 9600154 W ES9600154 W ES 9600154W WO 9705825 A1 WO9705825 A1 WO 9705825A1
Authority
WO
WIPO (PCT)
Prior art keywords
instrument
rigidity
measuring
cartilage
articular
Prior art date
Application number
PCT/ES1996/000154
Other languages
English (en)
Spanish (es)
Inventor
Pedro Guillen Garcia
Original Assignee
Asociacion Instituto De Biomecanica De Valencia Y Fundacion Mapfre Medicina
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 Asociacion Instituto De Biomecanica De Valencia Y Fundacion Mapfre Medicina filed Critical Asociacion Instituto De Biomecanica De Valencia Y Fundacion Mapfre Medicina
Publication of WO1997005825A1 publication Critical patent/WO1997005825A1/fr

Links

Classifications

    • 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
    • A61B5/4514—Cartilage
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0048—Detecting, measuring or recording by applying mechanical forces or stimuli
    • A61B5/0053—Detecting, measuring or recording by applying mechanical forces or stimuli by applying pressure, e.g. compression, indentation, palpation, grasping, gauging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0089—Biorheological properties

Definitions

  • the present invention consists of an instrument for measuring the stiffness of articular cartilage, the type of which have means of processing two signals obtained from two trans ⁇ ductors, one of which provides a signal proportional to the force applied to the cartilage and the other a signal proportional to the sinking that occurs in said cartilage when the referred force is applied, so that the processing means obtain the value of the rigidity from these parameters.
  • the object of the invention is to enable the execution of the measurement of the stiffness of the articular cartilage by means of indentation techniques, of the type used in arthroscopy, damaging the patient as little as possible.
  • Another object of the invention is to provide a portable instrument for measuring cartilage stiffness, so that its handling is simplified and considerably facilitated.
  • the invention is characterized in that it has indentation means that include a housing for a carrier strap of the displacement or sinking transducer that the cartilage suffers.
  • It also includes support means for the indentation means, among which the force transducer is inserted so that when the pressure is applied to the cartilage, after the indentation is carried out, the displacement of the strip occurs, measuring the force and displacement. in the processing means, which obtain the value of stiffness.
  • the indentation means are determined by a hollow cylindrical body whose front end is closed and in proximity thereto has a hole or opening in one of whose edges has an orthogonal appendix whose tip constitutes the means to press on the cartilage.
  • the hollow cylindrical body is provided with a longitudinal opening diametrically opposed to the hole in which the strap is arranged.
  • the strap has at its end a bend that defines a small section that passes through the hole of the cylindrical body, so that said end is flush with that of the appendix.
  • the other end of the strap is fixed by a flange on the back of the longitudinal opening.
  • the displacement measurement transducer that undergoes strapping when pressing on the cartilage is determined by a gauge, which are the sensors used in extensometry, which forms a Wheatston bridge, together with three resistors located in the conditioning means. .
  • the force transducer is determined by an annular body equipped with four sensors that form a Wheatstone bridge.
  • the support means have a hollow cylinder in which the hollow cylindrical body of indentation is inserted and fixed.
  • the support means have a head in which the annular body, which constitutes the force transducer, is fixed, so that the hollow cylinder is inserted into the head through the annular body and fixed between them by interposing sectors, so that when the pressure in the appendix occurs it is transmitted to the annular sensor.
  • the head is attached to a hollow handle inside which the electronic means for conditioning the signals obtained in the transducers are housed.
  • the electronic signal conditioning means are located between two longitudinal frames whose assembly is fixed by two extreme discoidal parts, so that the extraction of the electronic means is enabled to allow sterilization of the rest of the elements, whereby the handle is its rear part includes a thread in which a plug is placed that constitutes the means of facilitating access for the extraction and introduction of electronic means.
  • the extreme discoid parts that constitute the means of joining the longitudinal frames and The plate that supports the electronic signal conditioning means has holes, one of which constitutes the means through which a connector that is positioned in the head emerges, while the other constitutes the means of the passage of a cable for connection to an isolation amplifier.
  • the isolation amplifier constitutes the means that allows the connection to a computer or a processing card of the signals obtained in the transducers and treated in the signal conditioning means.
  • the signal conditioning means are powered by rechargeable batteries so that the instrument together with the features already discussed above, is fully portable, for which it can be included in a case along with the battery charger, connection cables and amplifiers of isolation.
  • FIGURES Figure 1. Shows an exploded perspective view of the exploded view of the instrument for measuring the stiffness of the articular cartilage object of the invention.
  • Figure 2. Shows a view according to a longitudinal section of the assembled instrument assembly, except for the electronic means that are partially inserted.
  • Figure 3. It shows a partial and sectioned view of the detail of the arrangement of the strap on the indentation means as well as the location of the different elements in the head.
  • Figure 4.- Shows a view according to a longitudinal section of the indentation bar.
  • Figure 5. Shows a plan view of the previous figure.
  • Figure 6. Shows a section along the axis A-
  • Figure 7.- Shows a plan view of the strip in order to show the location of the sensor.
  • Figure 8.- Shows a side view of the strap of the previous figure.
  • Figure 9. Shows a view according to a longitudinal section of the cylindrical body that supports the indentation bar of Figures 4, 5 and 6.
  • Figures 10 and 11 show a view of the sectors through which the force transducer is coupled.
  • Figure 12. Shows a bottom plan view of the flange by means of which the strap is fixed on the cylindrical element 1.
  • Figure 13. Shows a sectional view along the axis C-C of the previous figure.
  • Figure 14.- Shows a view according to section D-D of the previous figure.
  • Figure 15.- Shows a view according to a longitudinal section of the head that supports the indentation means.
  • Figure 16.- Shows a view according to a section B-B of the previous figure.
  • Figure 17. Shows a view of the cap that is screwed to the head, this view being partially sectioned.
  • Figure 18. Shows a front view of one of the racks that support electronic media.
  • Figure 19. Shows a view according to section EE of the previous figure.
  • Figure 20. Shows a front view of the other frame that constitutes the means for holding the electronic means.
  • Figure 21 Shows a longitudinal section along the axis F-F of the previous figure.
  • Figure 22. It shows a front view of one of the discoid elements that provide the fixation of the longitudinal frames and the electronic means.
  • Figure 23. Shows a plan view of a portable case in which the instrument of the invention is included as well as the elements necessary for its operation.
  • Figure 24 Shows an example of the application of a measure of the stiffness of a cartilage.
  • the instrument for the measurement of the stiffness of the articular cartilage of the invention presents as a completely new feature, the fact of enabling the execution of said measure, without the need to open the area that precedes the cartilage that is desired
  • Check its status that is, it allows its use by means of the indentation technique in a way that allows to examine the mechanical properties of the entire articular surface and to represent the variations of these properties with the cartilage topography.
  • the equipment will be used mainly in arthroscopic examinations, which implies very restrictive design conditions.
  • the invention has an indentation bar that is constituted from a cylindrical body 1, one of whose ends is topped by a cap hemispherical 2 from which and in the lower area a hole 3 is provided which is flanked by an appendix 4 whose tip constitutes the means for pressing the cartilage, as will be described later.
  • the cylindrical body 1 is provided with a longitudinal opening 5 on which a strap 6 is located at the end of which a bend has been made that defines a small section 7 that passes through the hole 3, all so that the end of section 7 flush with the end of Appendix 4.
  • the fixing of the strip 6 is carried out through a flange 8 whose upper surface is semicircular and adapts perfectly to the cylindrical body 1, so that it is arranged as an extension thereof.
  • the flange 8 has a thread 9 in which a screw 10 is tightened through a hole 11 arranged in the cylindrical body, the flexible tongue 6 being perfectly retained.
  • a gauge or gauge 12 is included which together with three resistors constitutes a Wheatstone bridge, the functionality of which will be described later.
  • the cylindrical body 1 is housed and fixed in a hollow cylinder 13 in whose anterior and internal part it has a section 14 of larger diameter in which the cylindrical body 1 is housed and fixed.
  • the instrument of the invention has a head 15 in which the front part is provided with a thread 16 in which a cover 17 with a hole 18 is fixed through which the cylindrical body 13 is inserted inside the head fifteen.
  • the head 15 has a first zone 19 in which a force sensor is included which is determined by an annular body 20 through which the cylindrical body 13 runs, fixing it and the head 15, by interposing a sector 22 and 23 respectively whose location is shown in figures 2 and 3 and whose structure is represented in figures 10 and 11. Note that said sectors are arranged one on the inside of the annular body and another on the outside, so these have different curvatures.
  • the head 15 has the hole 24 and the cylindrical body 13 with the threaded hole 25.
  • the rear end of the cylindrical body 13 is located in the zone 26 of the head 15, in which It is fixed using a screw 27.
  • the head 15 has a zone 28 which after a step defines a zone 29 that constitutes the rear opening of the head, so that said step constitutes the means of locating a disk piece 32 which is fixed by means of the screws 33 in the holes 30 practiced in the head.
  • a handle 34 that is housed in the zone 29 of the head 15, in which it is fixed through the holes 31 by means of screws 35.
  • the handle 34 is constituted by a hollow cylindrical body in which a button 36 is included, the functionality of which will be described later.
  • the discoidal piece 40 has an opening
  • the frame 37 is provided with a groove 45 which is located in correspondence with the opening 43 of the disk piece 40, so that to make the introduction of the electronic circuit, said groove 45 must be placed in correspondence with the pushbutton 36, of so that this constitutes a means of guidance. when introducing the electronic circuit.
  • the transducers located in the strip and inside the head are related to a connector provided in the zone 28 of the head 15, and by means of the corresponding cables that run through the different cylindrical bodies.
  • the electronic circuit when the electronic circuit is introduced, and after being guided as already mentioned, the electronic circuit is connected through the corresponding connector with the force and displacement transducers.
  • the electronic circuit includes a power battery, so that when the connection is made correctly, an indicator light arranged on the handle 34 turns on.
  • connection cable of the electronic circuit to a computer or a processing card comes out, which processes the data obtained in the electronic circuit.
  • the end of the appendix 4 and the end of the section 7 of the strip 6 are placed on the cartilage to be explored and pressed on the cartilage (figure 24), whereby the end of the appendix 4 causes a sinking of the cartilage , so that the strip 6 undergoes a displacement produced by the sinking of the cartilage, which is detected by the sensor 12 that is part of the Wheatstone bridge included in the electronic circuit, so that it effects the conditioning of said signal for subsequent treatment or interpretation.
  • the pressure exerted on appendix 4 is transmitted along the entire cylindrical body 1 and from it passes to the cylindrical body 13, which presses on the annular body 20 constituting the force transducer, this signal being conditioned in the electronic circuit only included in the handle 34 of the device of the invention.
  • the conditioned signals can be sent to the processing card or to the computer through the isolation amplifier, which has not been represented as being evident.
  • the button 36 allows the equipment to be switched on and also set to zero which allows the various measures to be carried out in order to obtain the load-deformation curves of the cartilage.
  • the described device has the particularity that it is easily transportable, and manageable, so that it can easily be included and transported in a portable case 47 in which the isolation amplifier 46 is included, the assembly determined by the frames 37, 38 and the support 39 which includes the electronic signal adaptation circuit, the cover 48, a battery charger 49, and the network connection cables 50.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Medical Informatics (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Rheumatology (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'instrument possède des moyens de traitement permettant de mesurer la force que l'on exerce sur le cartilage et l'affaissement que produit ladite force, afin d'obtenir la valeur de la rigidité du cartilage. L'instrument se caractérise en ce qu'il possède des moyens d'indentation (1) qui comprennent un logement pour une languette métallique (6) portant le transducteur de déplacement (12). Il possède des moyens de support (13, 15 et 34) portant les moyens d'indentation, entre lesquels est intercalé le transducteur de force (20), de sorte que lorsque l'on applique la force sur le cartilage, après avoir effectué l'indentation, la languette ou tige (6) se déplace, ce déplacement se traduisant par une valeur de rigidité du cartilage, valeur qui est donnée par les moyens de traitement. L'instrument se caractérise aussi par le fait qu'il est portable.
PCT/ES1996/000154 1995-08-03 1996-07-23 Instrument de mesure de la rigidite du cartilage articulaire WO1997005825A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP9501585 1995-08-03
ES9501585 1995-08-03

Publications (1)

Publication Number Publication Date
WO1997005825A1 true WO1997005825A1 (fr) 1997-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES1996/000154 WO1997005825A1 (fr) 1995-08-03 1996-07-23 Instrument de mesure de la rigidite du cartilage articulaire

Country Status (1)

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WO (1) WO1997005825A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040718A1 (fr) * 1997-03-10 1998-09-17 Asociacion Instituto De Biomecanica De Valencia Instrument pour la quantification de l'etat mecanique de conservation de surfaces biologiques
US5904658A (en) * 1996-08-23 1999-05-18 Osteobiologics, Inc. Hand-held materials tester
DE19929578A1 (de) * 1999-06-21 2001-01-11 Universitaetsklinikum Charite Verfahren und Vorrichtung zur Knorpel-Testung
CN105547880A (zh) * 2015-12-31 2016-05-04 广东科学技术职业学院 钣金强度快速检测装置及其检测方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132224A (en) * 1977-01-12 1979-01-02 Randolph Robert G Durometer for indentible tissue and the like
US4364399A (en) * 1981-02-23 1982-12-21 Dashefsky Joseph H Diagnostic instrument
EP0085813A1 (fr) * 1981-12-28 1983-08-17 Olympus Optical Co., Ltd. Sonde tubulaire à passer sur une surface à examiner pour détecter des variations de dureté
WO1993002619A1 (fr) * 1991-08-01 1993-02-18 Ilkka Kiviranta Dispositif et procede de mesure servant a evaluer la rigidite de tissus rigides
WO1993020752A1 (fr) * 1992-04-21 1993-10-28 Board Of Regents, The University Of Texas System Instrument de mesure arthroscopique par entaillage et son procede d'utilisation
WO1995028880A1 (fr) * 1994-04-22 1995-11-02 Board Of Regents The University Of Texas System Dispositif d'evaluation de cartilages articulaires et procede d'utilisation dudit dispositif

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132224A (en) * 1977-01-12 1979-01-02 Randolph Robert G Durometer for indentible tissue and the like
US4364399A (en) * 1981-02-23 1982-12-21 Dashefsky Joseph H Diagnostic instrument
EP0085813A1 (fr) * 1981-12-28 1983-08-17 Olympus Optical Co., Ltd. Sonde tubulaire à passer sur une surface à examiner pour détecter des variations de dureté
WO1993002619A1 (fr) * 1991-08-01 1993-02-18 Ilkka Kiviranta Dispositif et procede de mesure servant a evaluer la rigidite de tissus rigides
WO1993020752A1 (fr) * 1992-04-21 1993-10-28 Board Of Regents, The University Of Texas System Instrument de mesure arthroscopique par entaillage et son procede d'utilisation
WO1995028880A1 (fr) * 1994-04-22 1995-11-02 Board Of Regents The University Of Texas System Dispositif d'evaluation de cartilages articulaires et procede d'utilisation dudit dispositif

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904658A (en) * 1996-08-23 1999-05-18 Osteobiologics, Inc. Hand-held materials tester
EP0920614A4 (fr) * 1996-08-23 2001-10-04 Osteobiologics Inc Dispositif d'essai de materiaux tenu a la main
WO1998040718A1 (fr) * 1997-03-10 1998-09-17 Asociacion Instituto De Biomecanica De Valencia Instrument pour la quantification de l'etat mecanique de conservation de surfaces biologiques
ES2120916A1 (es) * 1997-03-10 1998-11-01 Inst De Biomecanica De Valenci Instrumento para la cuantificacion del estado mecanico de conservacion de superficies biologicas.
DE19929578A1 (de) * 1999-06-21 2001-01-11 Universitaetsklinikum Charite Verfahren und Vorrichtung zur Knorpel-Testung
DE19929578C2 (de) * 1999-06-21 2001-06-07 Universitaetsklinikum Charite Verfahren und Vorrichtung zur Knorpel-Testung
US6783503B1 (en) 1999-06-21 2004-08-31 Karl Storz, Gmbh & Co. Kg Method and device for testing the rigidity of biological tissue
CN105547880A (zh) * 2015-12-31 2016-05-04 广东科学技术职业学院 钣金强度快速检测装置及其检测方法

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