CN108645733A - A kind of touch sensor for measuring biological tissue elasticity modulus - Google Patents

A kind of touch sensor for measuring biological tissue elasticity modulus Download PDF

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Publication number
CN108645733A
CN108645733A CN201810454301.XA CN201810454301A CN108645733A CN 108645733 A CN108645733 A CN 108645733A CN 201810454301 A CN201810454301 A CN 201810454301A CN 108645733 A CN108645733 A CN 108645733A
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CN
China
Prior art keywords
biological tissue
elasticity modulus
touch sensor
cylindrical shell
electrode plate
Prior art date
Application number
CN201810454301.XA
Other languages
Chinese (zh)
Inventor
申景金
吴亚勇
王宏程
Original Assignee
南京邮电大学
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Application filed by 南京邮电大学 filed Critical 南京邮电大学
Priority to CN201810454301.XA priority Critical patent/CN108645733A/en
Publication of CN108645733A publication Critical patent/CN108645733A/en

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    • 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
    • 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
    • G01N3/02Details
    • G01N3/06Special adaptations of indicating or recording means
    • G01N3/066Special adaptations of indicating or recording means with electrical indicating or recording means
    • 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
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • 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
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • 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
    • G01N2203/0076Hardness, compressibility or resistance to crushing
    • G01N2203/0078Hardness, compressibility or resistance to crushing using indentation
    • 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
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/0617Electrical or magnetic indicating, recording or sensing means

Abstract

A kind of touch sensor for measuring biological tissue elasticity modulus, including semienclosed cylindrical shell, the top layer upper surface of cylindrical shell is installed by strain pressure transducer, the electric pole plate of the connected capacitance pressure transducer, in its lower surface, lower electrode plate and the rigid pressure head of capacitance pressure transducer, are connected.It is supported by cylindricality silica gel between electric pole plate and lower electrode plate.The upper surface of lower electrode plate is equipped with insulating layer.Rigid pressure head is cylindric, and the upper surface area of rigid pressure head is identical as the lower electrode plate suqare of capacitance sensor, and is connected by liquid glue.The bottom lower surface of cylindrical shell and the lower surface of rigid pressure head are located in same level, and the present invention, can be with the elasticity modulus of depth of cup and biological tissue between Accurate Determining sensor and biological tissue by abundant comprehensive sensor and contact biological tissue mechanism.

Description

A kind of touch sensor for measuring biological tissue elasticity modulus

Technical field

The present invention relates to a kind of sensor more particularly to a kind of tactile sensings for measuring biological tissue elasticity modulus Device.

Background technology

Biological tissue's touch sensor can feed back measured biological tissue's information after being analyzed via necessary processing To doctor, doctor is made to obtain and the similar feeling of true contact biological tissue.Using this kind of sensor, not only facilitate to biology Whether tissue, which occurs lesion, is differentiated, and can reduce the risk of micro-wound surgical operation, improves operation safety.

According to the applicant understood, at this stage, domestic and international scientific research personnel has carried out many to touch sensor from different perspectives It explores, it is proposed that numerous mentalities of designing and analysis method.But there are still some insufficient:Sensor structure has to be optimized;Shortage pair The analysis of sensor and contact biological tissue mechanism;The measurement for only focusing on contact force has ignored to depth of cup and biological group Knit the measurement method of the important parameters such as elasticity modulus.

Invention content

It is an object of the invention to:A kind of touch sensor for measuring biological tissue elasticity modulus, by fully comprehensive Close sensor and contact biological tissue mechanism, can between Accurate Determining sensor and biological tissue depth of cup and biological tissue Elasticity modulus.

In order to reach object above, a kind of touch sensor for measuring biological tissue elasticity modulus, including it is semiclosed Strain pressure transducer is installed in the cylindrical shell of formula, the top layer upper surface of cylindrical shell, and lower surface is connected capacitive pressure The electric pole plate of sensor, lower electrode plate and the rigid pressure head of capacitance pressure transducer, are connected.

The present invention preferred embodiment be:The top layer upper surface of cylindrical shell is connected strain-type pressure sensing by liquid glue Device.

Preferably, the top layer lower surface of cylindrical shell is connected the electric pole plate of capacitance pressure transducer, by liquid glue.

Preferably, electric pole plate and lower electrode plate are round copper sheet, pass through cylindricality between electric pole plate and lower electrode plate Silica gel supports.

It is highly preferred that the upper surface of lower electrode plate is equipped with insulating layer.

Preferably, rigid pressure head is cylindric, the upper surface area of rigid pressure head and the lower electrode plate face of capacitance sensor Product is identical, and is connected by liquid glue.

Preferably, the bottom lower surface of cylindrical shell and the lower surface of rigid pressure head are located in same level.

The present invention has the beneficial effect that:The touch sensor of the present invention is cylindrical shape, and when mutually being squeezed with biological tissue, half seals The lower surface and rigid pressure head for closing cylindrical shell generate impression in tissue surface simultaneously, and the strain-type pressure of cylindrical shell top layer passes Sensor can measure the contact total power between touch sensor and biological group, internal capacitance type sensor can measure rigid pressure head with Contact force between tissue can calculate and change between the upper and lower electrode plate of capacitance at this time according to the basic principle of capacitance type sensor Distance.It can accurately be obtained in conjunction with the formula that Elastic Contact Theory is extrapolated using above-mentioned two obtained power and distance The important parameters such as the elasticity modulus of depth of cup and biological tissue between sensor and tissue.

Description of the drawings

The present invention will be further described below with reference to the drawings.

Fig. 1 is the structural diagram of the present invention;

Fig. 2 is the structural schematic diagram of the cylindrical shell of the present invention;

Fig. 3 is structural schematic diagram in the cylinder of the cylindrical shell of the present invention;

Fig. 4 is sensor of the invention and two-dimensional representation when contact biological tissue;

Fig. 5 is the two-dimensional representation after sensor of the invention is squeezed with biological tissue.

Specific implementation mode

Embodiment one

- Fig. 3 is please referred to Fig.1, the present embodiment provides a kind of touch sensor for measuring biological tissue elasticity modulus, packets Semienclosed cylindrical shell 1 is included, the top layer of cylindrical shell 1 is closed, and the annular diameters of cylindrical shell are r, outer annular diameter For R, using iron as the making material of cylindrical shell 1, strain pressure transducer 2 is installed in the top layer upper surface of cylindrical shell 1, After touch sensor and biological tissue squeeze, this pressure sensor can measure the contact total power F between touch sensor and tissue, The electric pole plate 4 of the connected capacitance pressure transducer, in the top layer lower surface of cylindrical shell 1, the lower electrode of capacitance pressure transducer, Plate 7 is connected with rigid pressure head 8.

The top layer upper surface of cylindrical shell 1 is connected strain pressure transducer by liquid glue 3.

The top layer lower surface of cylindrical shell 1 is connected the electric pole plate 4 of capacitance pressure transducer, by liquid glue.

Electric pole plate 4 and lower electrode plate 7 are round copper sheet, pass through cylindricality silica gel between electric pole plate 4 and lower electrode plate 7 5 supports.

The upper surface of lower electrode plate 7 is equipped with insulating layer 6.

Rigid pressure head 8 is cylindric, the upper surface area of rigid pressure head 8 and the 7 area phase of lower electrode plate of capacitance sensor Together, it is S, and is connected by liquid glue.

The bottom lower surface of cylindrical shell 1 is located in same level with the lower surface of rigid pressure head 8

As shown in figure 4, when touch sensor and biological tissue just contact, tissue surface does not deform upon, two pressure Sensor registration is zero, and the initial distance on capacitance pressure transducer, between bottom crown is D.As shown in figure 5, working as sensor and group When knitting contact squeeze, tissue surface deforms upon, and generation depth of cup is H.

The strain pressure transducer registration in outside is the contact total power F between sensor and tissue, condenser type pressure at this time Force snesor registration is the contact force f between rigid pressure head and tissue can obtain according to the calibration relationship between capacitance C and power f Capacitance C.According to formula

The two poles of the earth distance between plates d at this time can be released by formula (1), touch sensor squeezes front and back capacitor plate with biological tissue Between variation distance, delta d=D-d.Due to the rigidity characteristic of rigid pressure head 8, before and after touch sensor is squeezed with biological tissue, cylinder The variation distance h of interior structure is approximately equal to Δ d.The formula being derived from according to contact theory:

(2) in formula,

(3) in (4), k is the ratio of cylindrical shell inner ring radius r and outer shroud radius R, i.e.,According to above-mentioned formula, Depth of cup H can be found out.

After acquiring depth of cup H, by contact theory, the relational expression between contact total power F and H can be obtained:

(5) in formula, the expression formula for example above-mentioned (3) and (4) formula of a and b, ν are material Poisson's ratio, usually take v=0.5.μ is to cut Shear modulu.There are following relationships between modulus of shearing μ, elastic modulus E, Poisson's ratio v three:

E=2 μ (1+v) (6)

In (5) formula, first derivative is asked to depth of cup H, following expression can be obtained:

In conjunction with above-mentioned (6) and (7) formula, following formula can be extrapolated:

According to known each parameter, (8) formula is utilized, it can be in the hope of the elastic modulus E of biological tissue.

In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (7)

1. a kind of touch sensor for measuring biological tissue elasticity modulus, which is characterized in that including semienclosed cylinder The top layer upper surface of shell, the cylindrical shell is installed by strain pressure transducer, the connected capacitive pressure sensing in lower surface The electric pole plate of device, lower electrode plate and the rigid pressure head of the capacitance pressure transducer, are connected.
2. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1, which is characterized in that The top layer upper surface of the cylindrical shell is connected the strain pressure transducer by liquid glue.
3. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1, which is characterized in that The top layer lower surface of the cylindrical shell is connected the electric pole plate of the capacitance pressure transducer, by liquid glue.
4. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1, which is characterized in that The electric pole plate and the lower electrode plate are round copper sheet, pass through cylindricality between the electric pole plate and the lower electrode plate Silica gel supports.
5. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1 or 4, feature exist In the upper surface of the lower electrode plate is equipped with insulating layer.
6. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1, which is characterized in that The rigid pressure head is cylindric, the lower electrode plate suqare phase of the upper surface area of the rigid pressure head and the capacitance sensor Together, and by liquid glue it is connected.
7. a kind of touch sensor for measuring biological tissue elasticity modulus according to claim 1, which is characterized in that The bottom lower surface of the cylindrical shell is located at the lower surface of the rigid pressure head in same level.
CN201810454301.XA 2018-05-14 2018-05-14 A kind of touch sensor for measuring biological tissue elasticity modulus CN108645733A (en)

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Citations (10)

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JPH0755598A (en) * 1993-08-19 1995-03-03 Mitsubishi Cable Ind Ltd Tactile sensor and tactile imager
JP3928053B2 (en) * 2004-09-13 2007-06-13 国立大学法人名古屋大学 Sensing device
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CN106053250A (en) * 2016-05-31 2016-10-26 航天材料及工艺研究所 Device and method for measuring superhigh temperature flexure elasticity modulus and fracture strain of material
CN206315079U (en) * 2016-04-18 2017-07-11 北京百脉智连科技有限公司 A kind of pulse image sensor and pulse condition collecting device for demarcating static force

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0755598A (en) * 1993-08-19 1995-03-03 Mitsubishi Cable Ind Ltd Tactile sensor and tactile imager
JP3928053B2 (en) * 2004-09-13 2007-06-13 国立大学法人名古屋大学 Sensing device
CN101063646A (en) * 2006-04-24 2007-10-31 香港理工大学 Method for testing and determining material or organizational Yang modulus and poisson ratio by impression
CN101059380A (en) * 2007-02-16 2007-10-24 中国科学院上海微系统与信息技术研究所 Flexible capacitance type touch sensor production method
CN102589759A (en) * 2012-02-20 2012-07-18 浙江大学 Bionic flexible touch sense sensing array based on piezoresistive type and capacitance type combination
CN204301899U (en) * 2013-12-06 2015-04-29 美蓓亚株式会社 Load cell
CN103743503A (en) * 2013-12-31 2014-04-23 浙江大学 Flexible three-dimensional force touch sensor based on piezoresistive and capacitive combination
CN205483873U (en) * 2016-01-25 2016-08-17 中国科学院声学研究所东海研究站 Biological tissue elasticity measuring apparatu
CN206315079U (en) * 2016-04-18 2017-07-11 北京百脉智连科技有限公司 A kind of pulse image sensor and pulse condition collecting device for demarcating static force
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