WO1997005825A1 - Instrument for measuring the rigidity of articular cartilage - Google Patents

Instrument for measuring the rigidity of articular cartilage Download PDF

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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
Grant status
Application
Patent type
Prior art keywords
means
instrument
measuring
articular cartilage
according
Prior art date
Application number
PCT/ES1996/000154
Other languages
Spanish (es)
French (fr)
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/45For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4514Cartilage
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/0048Detecting, measuring or recording by applying mechanical forces or stimuli
    • A61B5/0053Detecting, measuring or recording by applying mechanical forces or stimuli by applying pressure, e.g. compression, indentation, palpation, grasping, gauging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40Investigating hardness or rebound hardness
    • G01N3/42Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/45For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4528Joints
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0089Biorheological properties

Abstract

The instrument comprises processing means for measuring the force which is exerted on the cartilage and the collapse caused by said force, in order to obtain a value of the cartilage rigidity. It is characterized in that it is comprised of indentation means (1) including a housing for a metal strip (6) carrying the displacement transducer (12). It has support means (13, 15 and 34) for the indentation means, between which is arranged the force transducer (20) so that, when applying the force to the cartilage, once the indentation has been done, a displacement of the metal strip (6) takes place, and consequently the cartilage rigidity is obtained in the processing means. The instrument is also characterized in that it is portable.

Description

MEASURING INSTRUMENT FOR STIFF articular cartilage. OBJECT OF THE INVENTION

The present invention, as expressed in the title of this specification, consists of an instrument for measuring the stiffness of articular cartilage, type those with processing means two signals obtained from two trans ¬ producers, one of which provides a signal proportional to the force applied to cartilage and other signal a signal proportional to sag occurs in the cartilage to apply the said force, so that the processing means receive the value of rigidity from these parameters. However, the invention is intended to authorize the execution of the measure of the stiffness of articular cartilage by Indentation techniques of the type used in arthroscopies, damaging as little as possible to the patient. Another object of the invention to provide a portable instrument for the measurement of cartilage stiffness, so that considerably simplifies and facilitates handling.

BACKGROUND OF THE INVENTION The articular cartilage degeneration is associated with changes in the mechanical properties of the material, including rigidity. Such variations in stiffness are affected both by the aging thereof as by pathological processes or degenerative. Therefore we have developed a number of devices that allow to obtain the value of cartilage stiffness from the load-deformation curves of the material, different conditions for age, wear and thickness. All these devices have the disadvantage that require free access to the cartilage, for what must you open the correspondien¬ area in which the cartilage is located, so be empowered after making a measurement of this type, it is necessary to sew the open area.

In addition, such devices have a considerable volume, considerably difficult to transport, so must be the patient who has to move to the place of location of the measuring device, which also constitutes a drawback.

DESCRIPTION OF THE INVENTION To resolve the drawbacks indicated above the invention is characterized by comprising means indentation including a housing for a carrier strip transducer displacement or subsidence suffering cartilage.

Supporting means further includes means indentation between the force transducer so that when pressure is applied on cartilage, after making the indentation, the displacement of the strip occurs intercalates, measured strength and lie desplaza¬ in the processing means, which receive the value of rigidity.

Means indentation are determined by a hollow cylindrical body whose front end is closed and in proximity thereto has one hole or opening in one of its edges presents an orthogonal appendix whose tip constitutes the means of exerting pressure on cartilage. The hollow cylindrical body is provided with a longitudinal opening diametrically opposite the hole in which the strap is arranged. The strip has at its end a bend which defines a small section which passes through the hole of the cylindrical body, so that said end flush with the appendix. The other end of the strap is fixed by a flange at the back of the longitudinal opening.

The displacement measuring transducer suffering strip pressing on cartilage is determined by a feeler, which are the sensors utiliza¬ two strain gauge which forms a bridge Wheatsto- ne, along with three resistors on the conditioning means .

The force transducer is determined by an annular body provided with four sensors forming a Wheatstone bridge.

For its part the support means include a hollow cylinder in which is inserted and fixed the hollow cylindrical body indenting. Furthermore the supporting means have a head in which is fixed the annular body, which constitutes the force transducer, so that the hollow cylinder is introduced into the head through the annular body and fixed between them by interposing sectors, so that the pressure produced in the appendix to this is transmitted annular sensor.

The head is attached to a hollow handle into which electronic means acondiciona¬ tion of the signals obtained in the transducers are housed. The electronic signal conditioning are between two longitudinal racks which assembly is fixed by two end sheaves, so that the removal of the electronic means is authorized to allow sterilization of the rest of the elements, so that the handle its rear part includes a threaded plug in which a forming the means to facilitate access for removal and insertion of electronic media is located.

Extreme sheaves which constitute the attachment means of the longitudinal racks and the plate supporting electronic means acondicio¬ tioning signal, have holes, one of which is the means through which emerges a connector it is positioned on the head, while the other constitutes the means of passage of a cable for connection to an isolation amplifier.

The isolation amplifier is the means which enables connection to a computer or a card processing the signals obtained in the transducer and processed in the signal conditioning means.

Means signal conditioning are powered by rechargeable batteries so that the instrument with the features as discussed above, is fully portable, for what it can be included in a kit along with the battery charger, cables and amplifiers aislamien¬ to.

Hereinafter to provide a better understanding of this specification and forming an integral part thereof, a series of figures in which with an illustrative and nonlimiting character represent the object of the invention is attached.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows an exploded perspective exploded view of an instrument for measuring the stiffness of articular cartilage object of the inven¬ tion.

Figure 2 shows a view according to a longitudinal section of the assembled instrument assembly, except for the electronic means are partially introduced.

3. Figure 3 shows a partial and sectioned view of the detail of the arrangement of the strap on the means of indentation and the location of various elements in the head. Figure 4 shows a view along a longitudinal section of the rod buckling.

Figure 5 shows a plan view of the previous figure. Figure 6 shows a section along the axis A-

A of Figure 4.

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 strip of the previous figure.

Figure 9 shows a view in longitudinal section of the cylindrical body supporting the rod indentation Figures 4, 5 and 6.

Figures 10 and 11 show a view of the sectors through which the coupling force transducer is effected.

Figure 12 shows a bottom plan view of the flange by which the fixing strip 13 shows is performed on the cylindrical element 1. Figure a sectional view according to the axis CC of the previous figure.

Figure 14 shows a view along section DD of the previous figure.

Figure 15 shows a view along a longitudinal section of the bearing head means indentation.

Figure 16.- Shows a view according to section BB of the previous figure.

Figure 17.- shows a view of the cover which 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 along section EE of the previous figure. Figure 20.- Shows a front view of another frame constituting the holding means of electronic media.

Figure 21.- Shows a longitudinal section along the axis FF of the previous figure.

Figure 22.- Shows a front view of one of the discoid elements that provide the fastening of the longitudinal racks and cos electróni¬ means. Figure 23.- Shows a plan view of a portable bag in which the instrument of the invention and the elements necessary for its operation are provided.

Figure 24.- Shows an example of application of a measure of the stiffness of cartilage.

DESCRIPTION OF AN EMBODIMENT OF THE INVENTION A description of the invention based on the aforementioned figures is made das comenta¬. The instrument for measuring the stiffness of the articular cartilage of the invention, presented as completely novel feature, the fact of enabling the execution of that measure, without it having to open the area that precedes the cartilage to be check their status, that is, enables use by indentation technique allows examination so that the mechanical properties of the entire joint and represent variations of these propieda¬ des with the topography of the cartilage surface. The equipment is to be used mainly in arthroscopic examinations, which implies a very restrictive design conditions.

To achieve the previously mentioned objectives, the invention features a bar indenta¬ tion that is constituted from a cylindrical body 1, one end of which is topped by a hemispherical cap 2 from which and in the bottom area there is provided a hole 3 which is flanked by an appendix 4 whose tip is the means for pressing the cartíla¬ go, as will be described later. Furthermore, the cylindrical body 1 is provided with a longitudinal opening 5 on which a strip 6 is positioned on the end has been practiced a bend defining a small section 7 passing through the hole 3, all so that the end the section 7 is flush with the end of the tab 4.

Fixing the strip 6 it is performed through a flange 8 whose upper surface is semicircular and fits the cylindrical body 1 so that is arranged as an extension thereof. The flange 8 has a threaded 9 wherein a screw 10 which passes through a hole 11 arranged in the cylindrical body is tightened, the flexible tongue being retained perfectly 6.

On the tongue 6 a feeler or sensor 12 which together with three resistors constituting a Wheatstone bridge, whose functionality will be described later is included.

The cylindrical body 1 is housed and fixed in a hollow cylinder 13 whose front and internally has a portion 14 of larger diameter in which is housed and fixed the cylindrical body 1.

In addition, the instrument of the invention has a head 15 whose front portion is provided with a thread 16 on which a cover 17 provided with a hole 18 through which the cylindrical body 13 is inserted inside the head is fixed fifteen.

The head 15 has a first zone 19 in which a force sensor is determi¬ swim by an annular body 20 through which extends the cylindrical body 13, fixed to it and the head 15, by interposing includes a sector 22 and 23 whose location mind respectiva¬ shown in figures 2 and 3 and the structure shown in figures 10 and 11. Note that these sectors have one on the inside of the annular body and the other on the outside, so these have different curvatures.

To allow the passage and fixing screws 21, 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 area 26 of the head 15, in which it is fixed by a screw 27.

The head 15 has an area 28 following a stepping defines a zone 29 which constitutes the rear opening of the head, so that said staggering is the average location of a discoidal member 32 which is fixed by screws 33 into holes 30 formed in the head.

Another elements constituting the instrument of the invention is determined by a handle 34 which is received in the area 29 of the head 15, which is set through the holes 31 by screws 35.

The handle 34 is constituted by a hollow cylindrical body in which a switch 36, whose functionality will be described later is included.

Inside the handle 34 an electronic circuit that is supported by two grooved racks 37 and 38 between which a support 39 is inserted, joining these elements by their ends by sheaves 40 and 41 through teeth staying correspon¬ screws 42.

an electronic circuit whose function will be described posteriormen- included in the support 39. The discoidal part 40 has an opening

43 and with a central hole 44 through which sale- outside the connector of the electronic circuit with the force transducer and displacement transducer arranged on the strip 6.

The frame 37 is provided with a slot 45 is located in correspondence to the opening 43 of the discoidal piece 40, so that the in¬ sertion to the electronic circuit, said groove 45 should be placed in correspondence with the pusher 36, from so that it constitutes a guiding means. when introducing the electronic circuit.

The transducers located in the strip and inside the head, are associated with an area 28 provided in the connector head 15, and by corresponding cables running through the various cylindrical bodies.

Thus, at the time the introduction of the electronic circuit, and after guided as already mentioned, the connection of the electronic circuit through the corresponding connector with the force transducers and displacement is effected.

The electronic circuit includes a battery power, so that the connection made correctly, one indicator lamp provided in the handle 34 is turned.

After entering the electronic circuit inside the handle 34, it is sealed by a plug

48 through which the cable leaves the electronic circuit to a computer or processor board, which processes data from the electronic circuit.

At this point it is noted that the connection to the computer or electronic circuit card procesamien¬ to, is performed by an isolation amplifier 46. A description of the operation of the instrument of the invention is performed.

To perform the indentation, the end of the tab 4 and the end portion 7 of the strip 6, on cartilage exploring is placed and pressed onto the cartilage (Figure 24) whereby the end of the appendix 4 produces a collapse of cartilage so that the strip 6 undergoes a displacement produced by hundimien¬ to cartilage, which is detected by the sensor 12 forming part of the Wheatstone bridge included in the electronic circuit, so that the latter performs conditioning of the signal for further trata¬ tion or interpretation.

The pressure exerted on the appendix 4 is transmitted throughout the cylindrical body 1 and it passes the cylindrical body 13, which presses the annular body 20 constituting the force transducer, this signal being conditioned in the circuit electró¬ nico included in the handle 34 of the inven¬ tion device. Conditioned signals can be sent to the card processing or computer through the isolation amplifier, which is not shown to be evident.

The ignition switch 36 allows the team and also zeroing that allows the distin¬ tas measures to obtain the load curves-deforma¬ tion of cartilage.

The fact that the electronic circuit located inside the handle 34, can be removable, it is because required effect sterilization of the instrument, for which the whole device is introduced into an autoclave reaches temperatures of 1302, circuns¬ tance that electronics can not stand, so you need to be extracted. From the foregoing, it is clear that both the transducers and the wiring to the connector are suitable to be able to subject the process esterili¬ tion.

The device described, particu¬ larity presents that is easily portable, and manageable, so it can easily be included and carried in a portable briefcase 47 wherein the isolator assembly 46 determined by racks 37 is included, 38 and support 39 which includes the electronic circuit of signal adaptation, the cover 48, a battery charger 49, and the connecting cables to the network 50.

Claims

What is claimed
1. INSTRUMENT FOR MEASURING Stiffness articular cartilage, the type which have two processing means signals obtained from two transducers, one for measuring a force applied to cartilage and other for measuring the sinking or desplaza¬ tion which occurs in cartilage by applying force; essentially it characterized in that it has means indentation including a housing for a carrier strip transducer displacement or subsidence;
also having support means means indentation between the force transducer, so that by applying pressure on cartilage, after making the indentation, the movement of the strip occurs, allowing to measure the force exerted intercalates and the displacement obtained, so that the processing means the value of cartilage stiffness is obtained.
2. INSTRUMENT FOR MEASURING RIGIDITY ARTICULAR CARTILAGE according to claim 1, said means caracte¬ curly indentation are determined by a cylindrical hollow body whose front end is closed and in proximity thereto has a hole (3) one edge of which has an appendage (4) whose tip is the means for pressing the cartilage; having foreseen that the hollow cylindrical body (1) allows the clamping strip (6)
3. INSTRUMENT FOR MEASURING RIGIDITY articular cartilage, according to previous claims, characterized porgue the strip (6) has at its end a bend which defines a small section (7) which passes through the hole (3) cylindrical body (1), which end flush with the appendix, and whose other end is fixed by a flange (8) in the cylindrical body.
4. INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 1, Zado caracteri¬ that the transducer measuring displacement or collapse of cartilage, is determined by a sensor (12) (gauge) forming a Wheatstone bridge with three resistors located in the support means.
5. INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 1, caracteri¬ Zado that the force transducer is provided with four sensors forming a Wheatstone bridge.
6. INSTRUMENT FOR MEASURING STIFF
ARTICULAR CARTILAGE according to claim 1, caracteri¬ Zado that the support means include a hole (13) cylinder in which are inserted and fixed indentation means.
7. INSTRUMENT FOR MEASURING STIFF
ARTICULAR CARTILAGE according to claim 1, caracteri¬ Zado because the supporting means also have a head (15) in which is inserted and fixed hollow cylinder (13).
8. INSTRUMENT FOR MEASURING RIGID
Articular cartilage according to claims 1 and 7, characterized in that inside the head (15) force transducer (20) so it is set that the hole (13) cylinder extending therethrough and fixed between them so that the pressure produced in the appendix (4), it is transmitted to the force transducer (20).
9. INSTRUMENT FOR MEASURING THE STIFFNESS OF ARTICULAR CARTILAGE according to claims 1 and 7, characterized in that the head is fixed to a hollow handle in which is included, with the possibility of extracting all or part of the electronic processing means including the resistors of the Wheatstone bridge and means of adaptation of the signals obtained in the transducers, so that these signals can be processed days.
10. INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 10, wherein the head (15) connection means transducers with cos electróni¬ conditioning means and signal processing are included.
11. INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 1, wherein the support means include a handle (34) consists of a hollow that joins the head (15) cylinder, and in which cos electróni¬ include conditioning means and processing signals from the transducers.
12.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 1 and 10, characterized in that the electronic signal conditioning are placed on a support (39) provided between two longitudinal racks (37 and 38) which assembly fixed by two end sheaves (40 and 41).
13.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage, according to previous claim, characterized by one of the sheaves emerges a connector that is positioned in the head (15) so that connects to the connector provided in this means joining electronic transducers.
14.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage, according to previous claims, characterized in that the electronic means of signal processing and conditioning are powered by rechargeable batteries.
15.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claim 12, wherein the handle (34) has a button (36) activates electronically and performs the reset thereof to authorize the execution diferen¬ tes of measures.
16.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage according to claims 12 and 15, characterized in that the longitudinal frame (37) has a slot (45) which is guided on the pusher (36), facilitating the connection between the cos electróni¬ conditioning means and signal processing and transducers.
17.- INSTRUMENT PAR ALA RIGIDITY MEASUREMENT ARTICULAR CARTILAGE, according to previous claims, characterized in that the electronic means of conditioning and processing signals are connected to an isolation amplifier (46), whereby the connection is made to the means processing that may be determined by a specific card or a personal computer.
18.- INSTRUMENT FOR MEASURING RIGIDITY articular cartilage, according to previous claims, wherein the means indenter and the support thereof, together with a battery charger (49), connecting cables and amplifica¬ mers insulation (46), are arranged on a portable case (47).
PCT/ES1996/000154 1995-08-03 1996-07-23 Instrument for measuring the rigidity of articular cartilage WO1997005825A1 (en)

Priority Applications (2)

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

Publications (1)

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

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040718A1 (en) * 1997-03-10 1998-09-17 Asociacion Instituto De Biomecanica De Valencia Instrument for qualifying the mechanical preservation status of biological surfaces
US5904658A (en) * 1996-08-23 1999-05-18 Osteobiologics, Inc. Hand-held materials tester
DE19929578A1 (en) * 1999-06-21 2001-01-11 Universitaetsklinikum Charite Method and apparatus for cartilage testing
CN105547880A (en) * 2015-12-31 2016-05-04 广东科学技术职业学院 Fast metal plate strength detecting device and detecting method thereof

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 (en) * 1981-12-28 1983-08-17 Olympus Optical Co., Ltd. Tubular probe for sensing hardness variations when rubbed over a surface to be examined
WO1993002619A1 (en) * 1991-08-01 1993-02-18 Ilkka Kiviranta Measuring device and measuring procedure for assessing the stiffness of rigid tissue
WO1993020752A1 (en) * 1992-04-21 1993-10-28 Board Of Regents, The University Of Texas System Arthroscopic indenter and method for using the same
WO1995028880A1 (en) * 1994-04-22 1995-11-02 Board Of Regents The University Of Texas System Articular cartilage evaluator and method for use

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 (en) * 1981-12-28 1983-08-17 Olympus Optical Co., Ltd. Tubular probe for sensing hardness variations when rubbed over a surface to be examined
WO1993002619A1 (en) * 1991-08-01 1993-02-18 Ilkka Kiviranta Measuring device and measuring procedure for assessing the stiffness of rigid tissue
WO1993020752A1 (en) * 1992-04-21 1993-10-28 Board Of Regents, The University Of Texas System Arthroscopic indenter and method for using the same
WO1995028880A1 (en) * 1994-04-22 1995-11-02 Board Of Regents The University Of Texas System Articular cartilage evaluator and method for use

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920614A4 (en) * 1996-08-23 2001-10-04 Osteobiologics Inc Handheld materials tester
US5904658A (en) * 1996-08-23 1999-05-18 Osteobiologics, Inc. Hand-held materials tester
EP0920614A1 (en) * 1996-08-23 1999-06-09 Osteobiologics, Inc. Handheld materials tester
ES2120916A1 (en) * 1997-03-10 1998-11-01 Inst De Biomecanica De Valenci Instrument for quantification of the mechanical state of preservation of biological surfaces.
WO1998040718A1 (en) * 1997-03-10 1998-09-17 Asociacion Instituto De Biomecanica De Valencia Instrument for qualifying the mechanical preservation status of biological surfaces
DE19929578A1 (en) * 1999-06-21 2001-01-11 Universitaetsklinikum Charite Method and apparatus for cartilage testing
DE19929578C2 (en) * 1999-06-21 2001-06-07 Universitaetsklinikum Charite Method and apparatus for cartilage testing
US6783503B1 (en) 1999-06-21 2004-08-31 Karl Storz, Gmbh & Co. Kg Method and device for testing the rigidity of biological tissue
CN105547880A (en) * 2015-12-31 2016-05-04 广东科学技术职业学院 Fast metal plate strength detecting device and detecting method thereof

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