CN208383355U - A kind of high-precision differential type diaphragm optical fiber pressure capsule system - Google Patents
A kind of high-precision differential type diaphragm optical fiber pressure capsule system Download PDFInfo
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- CN208383355U CN208383355U CN201820905701.3U CN201820905701U CN208383355U CN 208383355 U CN208383355 U CN 208383355U CN 201820905701 U CN201820905701 U CN 201820905701U CN 208383355 U CN208383355 U CN 208383355U
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- needle
- optical fiber
- fibre optic
- compression sensor
- optic compression
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Abstract
The utility model provides a kind of high-precision differential type diaphragm optical fiber pressure capsule system, including the puncture needle being made of needle shell and hollow needle cavity, the sensing probe being placed in needle cavity, puncture needle front end is needle point, further includes the flexible sheet for being nested on needle shell inner wall and being mounted on sensing probe front end；Sensing probe and flexible sheet are integrated in the part in needle cavity close to needle point；Sensing probe includes three groups of first fibre optic compression sensors being distributed using needle cavity axial line as center annular array, the second fibre optic compression sensor being placed on needle cavity axial line；Above-mentioned fibre optic compression sensor is the differential type output of two output of an input.The utility model can improve the small strain of the measurement accuracy, induced lateral and axial force of small strain power, axial strain precision can be effectively improved by being especially placed in the second fibre optic compression sensor on needle cavity axial line, enhance and information is felt to the interaction force between puncture needle and soft tissue, to realize precisely manipulation, the safety of operation is improved.
Description
Technical field
The utility model belongs to small range high-precision optical fiber pressure sensing arts, and in particular to a kind of high-precision
Differential type diaphragm optical fiber pressure capsule system is suitable for micro-wound surgical operation.
Background technique
In micro-wound surgical operation, almost all of micro-wound surgical operation all lacks the direct participation of tactile.Minimally invasive surgery
Operative doctor is typically only capable to obtain the proximal end operating force of surgical instrument, and it is (common that sensor is typically mounted at Minimally Invasive Surgery instrument
For puncture needle) terminal position, it is as shown in Figure 1 it is outer hold portion 2, can not directly acquire direct between surgical instrument and soft tissue
Active force results in the missing of the power feel information of micro-wound surgical operation doctor, cannot more accurately sense the strain size of power,
Risk is brought to Minimally Invasive Surgery.And most micro-wound surgical operation instrument generally can only actual induction from cross force
Small strain (Fx, Fy) is not so sensitive for axial force (Fz) small strain induction.And most of fiber-optic pressure sensor
Using one output optical fibre structure of an input, light intensity is easy to be influenced by the intensity of light source, refractive index etc. device, causes to examine
Survey is not accurate, considerably increases the uncertain probability and danger coefficient of operation.
Utility model content
Aiming at the shortcomings in the prior art with problem, the utility model relates to a kind of high-precision differential type diaphragm optical fiber
Pressure capsule system can effectively improve the measurement accuracy of small strain power, enhance doctor between surgical instrument and soft tissue
Interaction force feel information, to realize accurate manipulation to surgical instrument, improve the safety of operation.
The utility model is achieved by the following technical programs:
The mounting object of the utility model is Minimally Invasive Surgery instrument, specially puncture needle, the puncture needle front end be for
Be pierced into the needle point of human body soft tissue, end be for connect with external device it is outer hold portion, the puncture needle is hollow shape, packet
Include peripheral needle shell and hollow needle cavity.
A kind of high-precision differential type diaphragm optical fiber pressure capsule system, the sensing including being placed in the needle cavity of puncture needle are visited
Head, the utility model further include the flexible sheet being nested on needle shell inner wall, and the flexible sheet is mounted on the sensing probe
Front end；The sensing probe includes three groups of first fiber-optic pressure sensors being distributed using needle cavity axial line as center annular array
Device, the second fibre optic compression sensor being placed on needle cavity axial line, first fibre optic compression sensor are mutually between any two
120°；First fibre optic compression sensor is fixed on needle shell inner wall by epoxide-resin glue, three group of first optical fiber pressure
Force snesor is in same section of needle cavity, and three groups are same model, size, size, and second fibre optic compression sensor passes through
Fixed beam is fixed on the needle cavity axial location, and for the fixed beam crossbearer in needle cavity, the flexible sheet will be outside it when installing
It is peripherally weldingly fixed on the inner wall of needle shell.The optical fiber of first fibre optic compression sensor and the second fibre optic compression sensor
It is designed as an input terminal and two output ends.
Further, the optical fiber structure of first fibre optic compression sensor and the second fibre optic compression sensor is concentric ring
The glass core of arrangement being distributed from the inside to the outside, the first output fibre core, input fibre core, the second output fibre core and the optical fiber packet of outside
Layer.Fiber optic bundle one end is divided into 3 beams by above structure, and input fibre core is light beam input, the first output fibre core and the second output fibre core
For two light beams output.
Further, the flexible sheet is often made of quartz diaphragm, can reduce the influence that temperature change is brought.
Further, the sensing probe and flexible sheet are integrated in the part in the needle cavity of puncture needle close to needle point.
Further, the first fibre optic compression sensor diameter is 100 μm, and the second fibre optic compression sensor diameter is 80 μm.
Compared with prior art, the utility model beneficial effect includes:
(1) optical fiber sensing technology advantage be high sensitivity, electromagnetism interference, good insulating, it is corrosion-resistant, can circumnutate, volume
Small and good compatibility with optical fiber transmission line etc., fibre optic compression sensor is integrated in the close of puncture needle by the utility model
The position of needle point, this is that nearest position is contacted with soft tissue, improves doctor and feels resolution to the power between needle point and soft tissue
Rate realizes the accurate manipulation to Minimally Invasive Surgery instrument.
(2) distributed architecture for first and second fibre optic compression sensor that the utility model uses is operated in Minimally Invasive Surgery
In the process can actual induction come from cross force (Fx, Fy) and axial force (Fz) small strain, especially the second optical fiber pressure biography
The design of sensor is even more to compensate for the not high defect of axial force small strain accuracy, and the detection accuracy of small stress-strain is significant
It improves.Accurate operation convenient for doctor to operation.
(3) the utility model is exported using flexible sheet differential type and the structure of single-input double-output designs, and utilizes bullet
Property diaphragm deform, the distance between fibre optic compression sensor and diaphragm change, by pressure signal be converted to displacement letter
Number, to be modulated to light intensity.Show that small stress-strain relationship, this detection method can be effective by the modulation and demodulation of light
Output intensity is eliminated to become than the interference of the factors such as reflectivity, the intensity of light source with diaphragm, the ratio between signals of two outputs and measurement distance
Change has preferable linear relationship, to be conducive to improve anti-interference ability and measurement accuracy.
(4) the differential output form of the dual output of the utility model fibre optic compression sensor, improve anti-interference ability and
The measurement accuracy of small power, and there is good output linearity degree, the size of the more acurrate induction small strain power of energy can effectively be kept away
Exempt to hurt human health tissue because of the missing of strain is felt to small power.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of micro-wound surgical operation instrument in the prior art.
Fig. 2 is the perspective structure schematic diagram after the utility model installation.
Fig. 3 is the side view structure perspective view of the sensing probe of the utility model.
Fig. 4 is the utility model structure principle chart, wherein 4 (a) be fibre optic compression sensor transmission principle figure；4 (b) be light
The schematic diagram of the section structure of fine pressure sensor；4 (c) be the measuring principle schematic diagram of sensing probe.
Illustrate: 1- puncture needle, 101- needle shell, 102- needle cavity, 2- hold portion, 3- needle point, 4- human body soft tissue, 5- bullet outside
Property diaphragm, 6- sensing probe, the first fibre optic compression sensor of 61-, the second fibre optic compression sensor of 62-, 601- first export fibre
Core, 602- input fibre core, and 603- second exports fibre core, 604- fibre cladding, 605- glass core, 7- fixed beam.
Fz is axial direction, and FxFy is transverse direction.
I0Input optical fibre Shu Guangqiang, I1Interior output fiber bundle light intensity, I2Outer output fiber bundle light intensity.
Pressure difference before and after P- flexible sheet.
The variable quantity of membrane cavity when d-flexible sheet deformation.
Term " center ", "upper", "lower", "left", "right", " transverse direction ", " axial direction ", " water in the description of the present invention,
It is flat ", " preceding ", " end ", "inner", the instructions such as "outside" orientation or positional relationship to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term
" first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.For the common of this field
The concrete meaning of above-mentioned term in the present invention can be understood for technical staff with concrete condition.
Specific embodiment
With reference to the accompanying drawing, the utility model is further described.
A kind of high-precision differential type diaphragm optical fiber pressure capsule system involved in the utility model is mounted in inside
In empty Minimally Invasive Surgery instrument, and puncture needle is common instrument in Minimally Invasive Surgery, and the utility model is installation with puncture needle
Object, as shown in Figure 1,1 front end of puncture needle is for being pierced into the needle point 3 of human body soft tissue 4, end as connecting with external device
Connect it is outer hold portion 2, puncture needle 1 is hollow shape, needle shell 101 and hollow needle cavity 102 including periphery.
As shown in Figures 2 and 3, a kind of high-precision differential type diaphragm optical fiber pressure sensing system involved by the utility model
System, including the sensing probe 6 being placed in the needle cavity 102 of puncture needle 1 and the flexible sheet 5 being nested on 101 inner wall of needle shell, institute
State the front end that flexible sheet 5 is mounted on the sensing probe 6, the sensing probe 6 includes three groups and with 102 axial line of needle cavity is
First fibre optic compression sensor 61 of thimble shape array distribution, the second fibre optic compression sensor being placed on 102 axial line of needle cavity
62, three group of first fibre optic compression sensor 61 is mutually in 120 ° between any two.In specific implementation, first optical fiber pressure passes
Sensor 61 is fixed on 101 inner wall of needle shell by epoxide-resin glue, and three group of first fibre optic compression sensor 61 is at same section
In needle cavity, and three groups are same model, size, size, and second fibre optic compression sensor 62 is fixed on institute by fixed beam 7
102 axial location of needle cavity is stated, 7 crossbearer of fixed beam is outer peripherally by it when the flexible sheet 5 is installed in needle cavity 102
It is weldingly fixed on the inner wall of needle shell 101, flexible sheet 5 is often made of quartz diaphragm, three group of first light in specific implementation converges
Fine 61 diameter of pressure sensor is usually set to 100 μm or so, and 62 diameter of the second fibre optic compression sensor is usually set to 80 μm
Left and right.
The distribution design of above-mentioned 6 structure of sensing probe can effectively realize the decoupling for maximizing axially and transversely power measurement,
It can effectively sense the strain from the small power of Fx, Fy, Fz, wherein three group of first fibre optic compression sensor 61 be mutually in
120 ° of interval angles are distributed on needle cavity inner wall, have remarkable result for the detection of cross force (Fx, Fy) small strain, but right
It is not so significant for detecting accuracy in the small strain of axial force.And the design of the second fibre optic compression sensor 62 at axle center
The measurement accuracy of axial force (Fz) small strain can be effectively improved, because puncture needle second optical fiber when axially moving is induction
The most effective position of distance change.And strain induction is uniform, abundant, comprehensive and non-blind area；The basic principle of Fibre Optical Sensor be by
Optical signal is sent into modulator by optical fiber, after making parameter to be measured and entering the light interaction of modulator zone, leads to the optical of light
Matter (intensity, wavelength, frequency, phase, the polarization state of such as light) changes, and becomes the signal source modulated, and is passing through optical fiber
It is sent into optical detector, it is demodulated, obtain measured parameter.Light continuous reflection and transmission in a fiber when in use, Minimally Invasive Surgery
Flexible deformation occurs for 5 stress of flexible sheet in operating process, and pressure signal is converted into displacement signal and is detected, specially light
The distance between fine pressure sensor and diaphragm change and output intensity are caused to be modulated, and pass through the modulation and demodulation of light
It can be concluded that small stress-strain relationship.
According to principle of elasticity, the relationship between pressure change and change of cavity length can be indicated with following formula:
In formula, the variable quantity of membrane cavity when d-flexible sheet deforms；μ-flexible sheet Poisson's ratio；R-flexible sheet
Effective radius；E-flexible sheet Young's modulus；H-flexible sheet thickness；Pressure difference before and after P-flexible sheet.
As shown in Fig. 4 (a) (b) (c), the light of first fibre optic compression sensor 61 and the second fibre optic compression sensor 62
Fine structure is concentric circle permutation, is arranged successively glass core 605, first from the inside to the outside and exports fibre core 601, input fibre core 602, second
The fibre cladding 604 of fibre core 603 and external package is exported, fiber optic bundle one end is divided into 3 beams, fiber design one by above structure
A input terminal and two output ends, input fibre core 602 are that light beam input, the first output fibre core 601 and the second output fibre core 603 are
Two light beams output, wherein the fiber optic bundle light intensity that the first output fibre core 601 of most one circle of the inside exports is I1, centre one is enclosed defeated
The fiber optic bundle light intensity for entering the input of fibre core 602 is I0, the fiber optic bundle light intensity that the second output fibre core 603 that outside one is enclosed exports is I2.When
When puncture needle 1 does not work, when the pressure difference P of 5 front and back of flexible sheet is zero, flexible sheet is indeformable, reflects two beam output lights
Fine light intensity is equal, I1=I2；After puncture needle 1 is pierced into human body soft tissue, the preceding pressure difference of flexible sheet 5 is greater than rear pressure difference, P > 0, when wearing
Pricker extract out human body soft tissue when with insertion human body soft tissue be it is opposite, the preceding pressure difference of flexible sheet 5 be less than rear pressure difference, P < 0, press
5 compressive deformation of flexible sheet when poor P is not zero, so that the reflected light received in the first output fibre core 601 that the inside one is enclosed
Strong I1Reduce, the reflective light intensity I that the second output fibre core 603 that outside one is enclosed receives2Increase, forms not good enough output, and two beams
Light intensity the ratio between can indicate are as follows:
The related constant such as A-and diaphragm size, material and output fiber bundle numerical aperture in formula；Before P-flexible sheet
Pressure difference afterwards.
Formula (1) both sides are taken into logarithm, take first item to obtain after expansion on the right of equation when meeting AP≤1
Above formula shows that output intensity is more unrelated than with the factors such as the reflectivity of diaphragm, the intensity of light source, thus can be effective
The influence of these factors is eliminated, and the ratio between the signal that optical fiber measurement two exports has preferable linear pass with measurement distance change
System, to be conducive to improve anti-interference ability and measurement accuracy.
The sensing probe 6 is integrated in the part in the needle cavity 102 of puncture needle 1 close to needle point 3 with flexible sheet 5, is convenient for
The power for improving small strain power between needle point 3 and human body soft tissue 4 when puncture needle 1 uses feels resolution ratio.
The above only expresses preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not
Therefore it can be interpreted as that a limitation on the scope of the patent of the present invention.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of the premise utility, several deformations can also be made, improves and substitutes, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (7)
1. a kind of high-precision differential type diaphragm optical fiber pressure capsule system, including needle shell (101) by periphery and hollow
The puncture needle (1) that needle cavity (102) is constituted and the sensing probe (6) that is placed in the needle cavity (102), before the puncture needle (1)
End is needle point (3), end is to hold portion (2) outside, it is characterised in that: further includes the flexible sheet being nested on needle shell (101) inner wall
(5), the flexible sheet (5) is mounted on the front end of the sensing probe (6)；The sensing probe (6) includes three groups and is fixed on
The first fibre optic compression sensor (61) on needle shell (101) inner wall, the second optical fiber pressure being placed on needle cavity (102) axial line
Force snesor (62)；The optical fiber of first fibre optic compression sensor (61) and the second fibre optic compression sensor (62) is transmitted as difference
Dynamic formula output, including two outputs of an input.
2. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: three
Group first fibre optic compression sensor (61) is distributed by center annular array of needle cavity (102) axial line, and described three group first
Fibre optic compression sensor (61) is mutually in 120 ° between any two.
3. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: institute
The optical fiber structure for stating the first fibre optic compression sensor (61) and the second fibre optic compression sensor (62) is concentric circle permutation, by it is interior extremely
It is arranged successively glass core (605), the first output fibre core (601), input fibre core (602), the second output fibre core (603) and outer outside
The fibre cladding (604) in portion.
4. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: institute
State the part that sensing probe (6) and flexible sheet (5) are integrated in needle point (3) close in needle cavity (102).
5. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: institute
Flexible sheet (5) is stated to be made of quartz diaphragm.
6. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: the
One fibre optic compression sensor (61) diameter is 100 μm, and the second fibre optic compression sensor (62) diameter is 80 μm.
7. a kind of high-precision differential type diaphragm optical fiber pressure capsule system according to claim 1, it is characterised in that: institute
It states the second fibre optic compression sensor (62) and is fixed on the needle cavity (102) axial location, the fixed beam by fixed beam (7)
(7) crossbearer is in needle cavity (102)；The interior of needle shell (101) will be peripherally weldingly fixed on when the flexible sheet (5) is installed outside it
On wall.
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|---|---|---|---|
| CN201820905701.3U CN208383355U (en) | 2018-06-12 | 2018-06-12 | A kind of high-precision differential type diaphragm optical fiber pressure capsule system |
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| CN201820905701.3U CN208383355U (en) | 2018-06-12 | 2018-06-12 | A kind of high-precision differential type diaphragm optical fiber pressure capsule system |
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| CN208383355U true CN208383355U (en) | 2019-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775981A (en) * | 2018-06-12 | 2018-11-09 | 南昌大学 | A kind of high-precision differential type diaphragm optical fiber pressure capsule system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775981A (en) * | 2018-06-12 | 2018-11-09 | 南昌大学 | A kind of high-precision differential type diaphragm optical fiber pressure capsule system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190115 Termination date: 20210612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |