CN106264708A - A kind of catheter pressure strained detection device - Google Patents

Abstract

The present invention relates to a kind of catheter pressure strained detection device, described device includes: ergometer, for detecting the stress of catheter pressure；Grating pressure sensor, is arranged on the deformable body of described catheter pressure, for detecting the strain signal of catheter pressure；Grating demodulation instrument, is connected with described pressure grating pressure sensor, obtains the strain of described catheter pressure for demodulating the detection signal of described grating pressure sensor；And processor, it is connected with described grating demodulation instrument, stress that described ergometer measurement obtains and the strain that described grating demodulation instrument is measured is utilized to set up pressure detecting model, and utilize the strain of described catheter pressure measured by described grating demodulation instrument and described pressure detecting model to be calculated radial force and the axial force that described catheter pressure is subject to during detection, calculate that described catheter pressure is subject to makes a concerted effort.The present invention can realize to catheter pressure stress quick, accurately detect.

Description

A kind of catheter pressure strained detection device

Technical field

The present invention relates to technical field of medical instruments, particularly relate to a kind of catheter pressure stress detection Device.

Background technology

At present, in medical interventions, radio frequency ablation catheter has had extensive application, It is mainly used in the treatment of the diseases such as heart atrial fibrillation, arrhythmia, intractable hypertension.Its Using method is by puncturing radio frequency on femoral artery or radial artery under the auxiliary of X-ray machine Ablation catheter inserts heart by blood vessel or is rich in orthosympathetic tremulous pulse, enters lesions position Row radio-frequency (RF) ablation.

Current this ablative surgery is completed, due to staff by experienced doctor's manual operation It is difficult to control accurately conduit head end tissue is reclined power, so disappearing at heart and tremulous pulse Melt and operation often has the complication of perforation and edema occur.There are some power conduits in the market, Such as patent CN201420301029.9 is mentioned a kind of can the medical catheter head end of measuring pressure. But the test calibration method about this conduit does not the most disclose, therefore this kind of pressure cannot be led The stress of pipe detects.The stress of catheter pressure is not the most surveyed by prior art simultaneously The device of amount.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of simple, effective to catheter pressure stress Carry out the device detected.

For solving above-mentioned technical problem, the invention discloses a kind of catheter pressure strained detection device, Described device includes:

Ergometer, for detecting the stress of catheter pressure；

Grating pressure sensor, is arranged on the deformable body of described catheter pressure, is used for detecting pressure The strain signal of power conduit；

Grating demodulation instrument, is connected with described pressure grating pressure sensor, is used for demodulating described grating The detection signal of pressure transducer obtains the strain of described catheter pressure；

And processor, it is connected with described grating demodulation instrument, utilizes described ergometer measurement to obtain Stress and the strain measured of described grating demodulation instrument set up pressure detecting model, and in detection During utilize the strain of described catheter pressure and institute obtained by the demodulation of described grating demodulation instrument State pressure detecting model and be calculated radial force and the axial force that described catheter pressure is subject to, calculate What described catheter pressure was subject to makes a concerted effort.

Preferably, described processor includes force analysis unit, and described ergometer is measured by it The stress of described catheter pressure is decomposed into along the axial axial force of catheter pressure and along catheter pressure Radial force radially；And described strain partitioning is radial strain and axle by described force analysis unit To strain, wherein, described radial strain is caused by described radial force, and described axial strain is by institute State axial force to cause.

Preferably, described grating pressure sensor is three, and is uniformly distributed in described pressure On one circumference of conduit；The strain that obtains of demodulation of described grating demodulation instrument includes three strains: First strain, the second strain and the 3rd strain；Wherein, the first strain partitioning is the first radial direction Strain and the first axial strain, the second strain partitioning is the second radial strain and the second axial strain, 3rd strain partitioning is the 3rd radial strain and the 3rd axial strain.

Preferably, described processor includes that unit set up by model, and it utilizes described ergometer to measure Strain calculation the first corrected parameter and second that the stress obtained and described grating demodulation instrument are measured Corrected parameter, and utilize described first correct value parameter and the second corrected parameter to set up pressure detecting Model:

F₁=K₁·E_max

F₂=K₂·E_a2

In formula, K1 represents described first corrected parameter, and K2 represents described second corrected parameter, F1 represents the radial force that described catheter pressure is subject to, and it is axial that F2 represents that described catheter pressure is subject to Power, E_maxRepresent the outermost layer strain of described catheter pressure, E_a2Represent what described axial force caused Described first axial strain.

Preferably, described model is set up unit and is utilized equation below described first corrected parameter of calculating With the second corrected parameter:

$K_1=\frac{F_1}{E_{\max }}$

$K_2=\frac{F_2}{E_{a2}}$

In formula, F1 represents the radial force that the described catheter pressure that described ergometer is measured is subject to, F2 Representing the axial force that the described catheter pressure that described ergometer is measured is subject to, K1 represents described first Corrected parameter, K2 represents described second corrected parameter, E_maxRepresent the outermost of described catheter pressure Ply strain, E_a2Represent described first axial strain that described axial force causes.

Preferably, described model set up unit utilize equation below calculate catheter pressure described Outer ply strain E_max:

$E_{max}=\frac{E_{a1}}{\frac{\sqrt{3}K}{\sqrt{4+4K=4K^2}}}$

Wherein,

$K=\frac{E_{a1}}{E_{b1}}$

E_a1+E_b1+E_c1=0

E_a2=E_b2=E_c2

In formula, Ea1 represents described first radial strain, and Eb1 represents described second radial strain, Ec1 represents described 3rd radial strain, and Ea2 represents described first axial strain, and Eb2 represents Two direction axial strains, Ec2 represents third direction axial strain.

Preferably, described processor also includes amending unit, changes the stress of described catheter pressure, Utilize the strain of the described catheter pressure measured by described grating demodulation instrument and described pressure detecting Model is calculated radial force and the axial force that described catheter pressure is subject to, and calculates presently described pressure What power conduit was subject to makes a concerted effort；Calculate that presently described catheter pressure is subject to makes a concerted effort and by described dynamometry The difference of the stress of the described catheter pressure of measurement amount, as pressure correction value, and utilizes described pressure What described catheter pressure was subject to by power correction value makes a concerted effort to be modified.

Preferably, described processor is according to making a concerted effort that the equation below described catheter pressure of calculating is subject to:

$F=\sqrt{{F_1}^2+{F_2}^2}$

In formula, F represents that what described catheter pressure was subject to makes a concerted effort, and F1 represents that described catheter pressure is subject to The radial force arrived, F2 represents the axial force that described catheter pressure is subject to.

Preferably, described processor calculates described catheter pressure and tissue wall according to equation below Angle:

$cos\mathrm{\θ}=\frac{F_1}{F}$

In formula, θ represents the angle of described catheter pressure and tissue wall, and F represents described catheter pressure Be subject to makes a concerted effort, and F1 represents the radial force that described catheter pressure is subject to.

The technique scheme of the present invention has the advantage that and can realize catheter pressure stress Quick, accurately detect.

Accompanying drawing explanation

Fig. 1 is the structural representation of catheter pressure；

Fig. 2 is assembly of the invention structural representation；

Fig. 3 is the power that the power utilizing assembly of the invention measurement to obtain obtains with ergometer measurement Correlation curve figure；

Fig. 4 is the error curve diagram of the catheter pressure stress utilizing assembly of the invention to detect.

Detailed description of the invention

Make to retouch the most in detail to the detailed description of the invention of the present invention with embodiment below in conjunction with the accompanying drawings State.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.

Fig. 2 is assembly of the invention structural representation, the inventive system comprises: ergometer, For detecting the stress of catheter pressure；Grating pressure sensor, is arranged at described catheter pressure On deformable body, for detecting the strain signal of catheter pressure；Grating demodulation instrument, with described pressure The grating pressure sensor of conduit connects, and obtains for demodulating the signal of described grating pressure sensor Strain to described catheter pressure；And processor, it is connected with described grating demodulation instrument, utilizes Pressure is set up in stress and the strain of described grating demodulation instrument measurement that described ergometer measurement obtains Detection model, and utilize the described pressure measured by described grating demodulation instrument to lead during detection Strain and the described pressure detecting model of pipe are calculated the radial force that described catheter pressure is subject to And axial force, calculate that described catheter pressure is subject to makes a concerted effort.

Catheter pressure includes conduit head end and deformable body, as it is shown in figure 1, during catheter pressure stress Its deformable body can bend, and is positioned at the sensor above deformable body and deformation detected, by signal transmission To grating demodulation instrument, there is grating demodulation instrument to process and strained.Preferably, described grating demodulation The model that instrument is is SM130, for the fiber Bragg grating (FBG) demodulator of MiCROPIC company of the U.S., but It is not limited to this kind of equipment, it is also possible to other same categories of device replace.It is seen from figure 1 that, pressure Power F suffered by conduit can be decomposed into two power: is respectively along axial power F1 of conduit and hangs down Power F2 that straight catheter is axial.Test when, give F1 and the F2 stress that conduit is simple respectively, By optical fibre interrogation instrument SM130 detection strain.

Further, described processor includes force analysis unit, and described ergometer is measured by it The stress of described catheter pressure be decomposed into along the axial axial force of catheter pressure and lead along pressure Caliber to radial force；And described force analysis unit by described strain partitioning be radial strain and Axial strain, wherein, described radial strain causes with described radial force, described axial strain with Described axial force causes.Preferably, grating pressure sensor is three, and is uniformly distributed in On one circumference of described catheter pressure, i.e. three grating pressure sensors are to become 120 each other The formal distribution of degree angle is on a circumference of the axial direction of catheter pressure, and described circumference is Positive round, the not oval circle waiting other forms, the demodulation of the most described grating demodulation instrument obtains Strain includes three strains: the first strain, the second strain and the 3rd strain；Wherein, first Strain partitioning is the first radial strain and the first axial strain, and the second strain partitioning is the second radial direction Strain and the second axial strain, the 3rd strain partitioning is the 3rd radial strain and the 3rd axial strain.

Further, described processor includes that unit set up by model, and it utilizes described dynamometry to measure Strain calculation the first corrected parameter that the stress measured and described grating demodulation instrument are measured and the Two corrected parameters, and utilize described first correct value parameter and the second corrected parameter to set up pressure inspection Survey model:

F₁=K₁·E_max

F₂=K₂·E_a2

In formula, K1 represents described first corrected parameter, and K2 represents described second corrected parameter, F1 represents the radial force that described catheter pressure is subject to, and it is axial that F2 represents that described catheter pressure is subject to Power, E_maxRepresent the outermost layer strain of described catheter pressure, E_a2Represent what described axial force caused First axial strain.

Described model is set up unit and is utilized equation below calculating described first corrected parameter and second to repair Positive parameter:

$K_1=\frac{F_1}{E_{\max }}$

$K_2=\frac{F_2}{E_{a2}}$

In formula, F1 represents the radial force that the described catheter pressure that described ergometer is measured is subject to, F2 Representing the axial force that the described catheter pressure that described ergometer is measured is subject to, K1 represents described first Corrected parameter, K2 represents described second corrected parameter, E_maxRepresent the outermost of described catheter pressure Ply strain, E_a2Represent the first axial strain that described axial force causes.

Described model is set up unit and is utilized equation below to calculate the outermost layer strain E of catheter pressure_max:

$E_{max}=\frac{E_{a1}}{\frac{\sqrt{3}K}{\sqrt{4+4K=4K^2}}}$

Wherein,

$K=\frac{E_{a1}}{E_{b1}}$

E_a1+E_b1+E_c1=0

E_a2=E_b2=E_c2

In formula, Ea1 represents described first radial strain, and Eb1 represents described second radial strain, Ec1 represents described 3rd radial strain, and Ea2 represents described first axial strain, and Eb2 represents institute Stating the second axial strain, Ec2 represents described 3rd axial strain.

Further, described processor calculates, according to equation below, the conjunction that described catheter pressure is subject to Power:

$F=\sqrt{{F_1}^2+{F_2}^2}$

In formula, F represents that what described catheter pressure was subject to makes a concerted effort, and F1 represents that described catheter pressure is subject to The radial force arrived, F2 represents the axial force that described catheter pressure is subject to.

Further, described processor also includes amending unit, changes being subject to of described catheter pressure Power, utilizes the strain of the described catheter pressure measured by described grating demodulation instrument and described pressure Detection model is calculated radial force and the axial force that described catheter pressure is subject to, and calculates current institute That states that catheter pressure is subject to makes a concerted effort；Calculate that presently described catheter pressure is subject to makes a concerted effort and by described The difference of the stress of described catheter pressure measured by ergometer, as pressure correction value, and utilizes institute It is modified state that described catheter pressure is subject to by pressure correction value with joint efforts.

Further, described processor calculates described catheter pressure and tissue wall according to equation below Angle:

$cos\mathrm{\θ}=\frac{F_1}{F}$

In formula, θ represents the angle of described catheter pressure and tissue wall, and F represents described catheter pressure Be subject to makes a concerted effort, and F1 represents the radial force that described catheter pressure is subject to.

Fig. 3 is the power that the power utilizing assembly of the invention measurement to obtain obtains with ergometer measurement Correlation curve figure；Curve with initial point is the data utilizing assembly of the invention to record, and carries The curve having square dot is by the data measured by ergometer, is found by two Data Comparisons, Its result is basically identical, illustrates that the test result of this system is the most accurate.

The data recorded by ergometer are considered standard accurately, then utilize assembly of the invention to survey The data obtained deduct the difference that the data measured by ergometer obtain, as described in Figure 4, this difference base This controls within 2g, illustrates that the data precision utilizing assembly of the invention to measure is the highest.

Corresponding and assembly of the invention there is also a kind of method measuring catheter pressure stress, and it includes Following steps:

S1, by ergometer measure catheter pressure stress, detected by grating pressure sensor Catheter pressure strain signal, and demodulate the detection of described grating pressure sensor by grating demodulation instrument Signal, obtain the strain of described catheter pressure；

S2, stress that described ergometer measurement obtains and described grating demodulation instrument is utilized to demodulate Strain calculation the first corrected parameter arrived and the second corrected parameter；

S3, described first correct value parameter and the second corrected parameter is utilized to set up pressure detecting model:

F₁=K₁·E_max

F₂=K₂·E_a2

In formula, K1 represents described first corrected parameter, and K2 represents described second corrected parameter, F1 represents the radial force that described catheter pressure is subject to, and it is axial that F2 represents that described catheter pressure is subject to Power, E_maxRepresent the outermost layer strain of described catheter pressure, E_a2Represent what described axial force caused First axial strain；

S4, actually detected in, utilize the described catheter pressure measured by described grating demodulation instrument Strain and described pressure detecting model are calculated radial force and the axle that described catheter pressure is subject to Xiang Li, and making a concerted effort of calculating that described catheter pressure is subject to.

Further, also include after described step S3 sets up described pressure detecting model calculating pressure The step of power correction value:

Change the stress of described catheter pressure, utilize and demodulated, by described grating demodulation instrument, the institute obtained Strain and the described pressure detecting model of stating catheter pressure are calculated described catheter pressure and are subject to Radial force and axial force, and making a concerted effort of calculating that presently described catheter pressure is subject to；

Ergometer is utilized to measure the stress of described catheter pressure；

Calculate that presently described catheter pressure is subject to make a concerted effort and described ergometer is measured described pressure and is led The difference of the stress of pipe, as described pressure correction value, and utilizes described pressure correction value to institute State the described catheter pressure that step S4 calculates to be modified be subject to joint efforts.

Further, described step S1 specifically includes following steps:

S11, measured the stress of catheter pressure by ergometer, and the institute measured by described ergometer State the stress of catheter pressure to be decomposed into along the axial axial force of catheter pressure and along catheter pressure footpath To radial force；

S12, detect catheter pressure strain signal by grating pressure sensor, and by grating solution The signal adjusting instrument demodulation grating pressure sensor detection obtains the strain of described catheter pressure, and will Described strain partitioning is radial strain and axial strain, wherein, and described radial strain and described footpath Causing to power, described axial strain causes with described axial force.

In described step S12, in described step S12, measured by described grating demodulation instrument The strain of described catheter pressure includes three strains: the first strain, the second strain and the 3rd are answered Become；Wherein, the first strain partitioning is the first radial strain and described first axial strain, second Strain partitioning is the second radial strain and the second axial strain, and the 3rd strain partitioning is the 3rd radial direction Strain and the 3rd axial strain；Described three strains are by the inspection of three described grating pressure sensors Surveying that signal is demodulated obtains, three described grating pressure sensors are uniformly distributed in described pressure On one circumference of the deformable body of conduit..

Further, in described step S2, equation below is utilized to calculate described first corrected parameter With the second corrected parameter:

$K_1=\frac{F_1}{E_{max}}$

$K_2=\frac{F_2}{E_{a2}}$

In formula, F1 represents the radial force that the described catheter pressure that described ergometer is measured is subject to, F2 Representing the axial force that the described catheter pressure that described ergometer is measured is subject to, K1 represents described first Corrected parameter, K2 represents described second corrected parameter, E_maxRepresent the outermost of described catheter pressure Ply strain, E_a2Represent the first axial strain that described axial force causes.

The outermost layer strain E of described catheter pressure_maxCalculated by equation below:

$E_{max}=\frac{E_{a1}}{\frac{\sqrt{3}K}{\sqrt{4+4K=4K^2}}}$

Wherein,

$K=\frac{E_{a1}}{E_{b1}}$

E_a1+E_b1+E_c1=0

E_a2=E_b2=E_c2

In formula, Ea1 represents described first radial strain, and Eb1 represents described second radial strain, Ec1 represents described 3rd radial strain, and Ea2 represents described first axial strain, and Eb2 represents institute Stating the second axial strain, Ec2 represents described 3rd axial strain.

Further, in described step S4, calculate described catheter pressure according to equation below and be subject to Make a concerted effort:

$F=\sqrt{{F_1}^2+{F_2}^2}$

In formula, F represents that what described catheter pressure was subject to makes a concerted effort, and F1 represents that described catheter pressure is subject to The radial force arrived, F2 represents the axial force that described catheter pressure is subject to.

Further, said method is further comprising the steps of:

S5, calculate the angle of described catheter pressure and tissue wall:

$cos\mathrm{\θ}=\frac{F_1}{F}$

In formula, θ represents the angle of described catheter pressure and tissue wall, and F represents described catheter pressure Be subject to makes a concerted effort, and F1 represents the radial force that described catheter pressure is subject to.

Can be calculated by step S5 when the direction of conduit stress, i.e. conduit recline with tissue Angle, θ, it is simple to judge that area that conduit head end reclines with tissue is (because perpendicular contact and parallel The area of contact is different), thus make corresponding adjustment.

Last it is noted that above example is only in order to illustrate technical scheme, and Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side The spirit and scope of case.

Claims (8)

1. a catheter pressure strained detection device, it is characterised in that described device includes:

Ergometer, for detecting the stress of catheter pressure；

Grating pressure sensor, is arranged on the deformable body of described catheter pressure, is used for detecting pressure The strain signal of power conduit；

Grating demodulation instrument, is connected with described pressure grating pressure sensor, is used for demodulating described grating The detection signal of pressure transducer obtains the strain of described catheter pressure；

And processor, it is connected with described grating demodulation instrument, utilizes described ergometer measurement to obtain Stress and the strain measured of described grating demodulation instrument set up pressure detecting model, and in detection During utilize the strain of described catheter pressure and institute obtained by the demodulation of described grating demodulation instrument State pressure detecting model and be calculated radial force and the axial force that described catheter pressure is subject to, calculate What described catheter pressure was subject to makes a concerted effort.

Device the most according to claim 1, it is characterised in that described processor includes being subject to Power analytic unit, the stress of its described catheter pressure measured by described ergometer is decomposed into along pressure Axial force that power conduit is axial and along catheter pressure radial force radially；And described force analysis Described strain partitioning is radial strain and axial strain by unit, wherein, described radial strain by Described radial force causes, and described axial strain is caused by described axial force.

Device the most according to claim 2, it is characterised in that described grating pressure sensing Device is three, and is uniformly distributed on a circumference of described catheter pressure；Described grating solution The strain adjusting instrument demodulation to obtain includes three strains: the first strain, the second strain and the 3rd are answered Become；Wherein, the first strain partitioning is the first radial strain and the first axial strain, the second strain Being decomposed into the second radial strain and the second axial strain, the 3rd strain partitioning is the 3rd radial strain With the 3rd axial strain.

Device the most according to claim 3, it is characterised in that described processor includes mould Unit set up by type, and it utilizes the stress and described grating demodulation instrument that described ergometer measurement obtains Strain calculation the first corrected parameter measured and the second corrected parameter, and utilize described first to revise Value parameter and the second corrected parameter set up pressure detecting model:

F₁=K₁·E_max

F₂=K₂·E_a2

In formula, K1 represents described first corrected parameter, and K2 represents described second corrected parameter, F1 represents the radial force that described catheter pressure is subject to, and it is axial that F2 represents that described catheter pressure is subject to Power, E_maxRepresent the outermost layer strain of described catheter pressure, E_a2Represent what described axial force caused Described first axial strain.

Device the most according to claim 4, it is characterised in that unit set up by described model Equation below is utilized to calculate described first corrected parameter and the second corrected parameter:

$K_1=\frac{F_1}{E_{\max }}$

$K_2=\frac{F_2}{E_{a2}}$

In formula, F1 represents the radial force that the described catheter pressure that described ergometer is measured is subject to, F2 Representing the axial force that the described catheter pressure that described ergometer is measured is subject to, K1 represents described first Corrected parameter, K2 represents described second corrected parameter, E_maxRepresent the outermost of described catheter pressure Ply strain, E_a2Represent described first axial strain that described axial force causes.

Device the most according to claim 5, it is characterised in that unit set up by described model Equation below is utilized to calculate the described outermost layer strain E of catheter pressure_max:

$E_{max}=\frac{E_{a1}}{\frac{\sqrt{3}K}{\sqrt{4+4K=4K^2}}}$

Wherein,

$K=\frac{E_{a1}}{E_{b1}}$

In formula, Ea1 represents described first radial strain, and Eb1 represents described second radial strain, Ea2 represents described first axial strain.

Device the most according to claim 6, it is characterised in that described processor also includes Amending unit, changes the stress of described catheter pressure, utilizes by the measurement of described grating demodulation instrument The strain of described catheter pressure and described pressure detecting model are calculated described catheter pressure and are subject to The radial force arrived and axial force, calculate that presently described catheter pressure is subject to makes a concerted effort；Calculate current What described catheter pressure was subject to makes a concerted effort and by the stress of the described ergometer described catheter pressure of measurement Difference, as pressure correction value, and utilizes described pressure correction value to be subject to described catheter pressure Make a concerted effort be modified.

Device the most according to claim 7, it is characterised in that described processor is according to such as What the lower formula described catheter pressure of calculating was subject to makes a concerted effort:

$F=\sqrt{{F_1}^2+{F_2}^2}$

In formula, F represents that what described catheter pressure was subject to makes a concerted effort, and F1 represents that described catheter pressure is subject to The radial force arrived, F2 represents the axial force that described catheter pressure is subject to.