CN106175922A - A kind of method measuring catheter pressure stress - Google Patents

Abstract

The present invention relates to a kind of method measuring catheter pressure stress, said method comprising the steps of: measured the stress of catheter pressure by ergometer, measured the strain of described catheter pressure by grating demodulation instrument；Utilize stress that described ergometer measurement obtains and strain calculation the first corrected parameter that described grating demodulation instrument is measured and the second corrected parameter；Described first correct value parameter and the second corrected parameter is utilized to set up pressure detecting model；In actually detected, the strain of described catheter pressure measured by described grating demodulation instrument and described pressure detecting model is utilized to be calculated radial force and the axial force that described catheter pressure is subject to, and making a concerted effort of calculating that described catheter pressure is subject to.The method of the present invention can stress accurate, simple, quickly detection catheter pressure.

Description

A kind of method measuring catheter pressure stress

Technical field

The present invention relates to technical field of intelligent traffic, particularly relate to a kind of measurement catheter pressure stress Method.

Background technology

Power sensing technology on electrophysiologicalcatheter catheter is the technology grown up recent years.This technology The built-in force transducer of head end at conduit, to measure the electrophysiologicalcatheter catheter when electro physiology is performed the operation Contact force between head end and ablation tissue.Medical research finds what electrophysiology ablation caused Contact force between punching rate and electrophysiology ablation conduit head end and tissue has certain relation.

It was proposed CF (conduit head end stress) electrophysiologicalcatheter catheter, this electrophysiologicalcatheter catheter in recent years Be on the basis of Carto (a kind of Electrophysiological mapping system) newly-increased module to measure CF value, Its principle is by three miniature coils equally distributed on the circumference of deformable body, and working as of making is led The locus of three coils of deformable body deformation effect during tube head end stress, then by deformable body The receiving coil of the other end accepts the space magnetic vector of three miniature coils, thus draws deformation The strain of body, then the CF value of conduit head end is restored by demodulation calculating equipment.

Conventional computational methods are substantially calculating based on mathematics tensor, calculate complexity and easily go out Wrong.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of method measuring catheter pressure stress, real The now simple accurately detection to catheter pressure.

For solving above-mentioned technical problem, the invention discloses a kind of side measuring catheter pressure stress Method, said method comprising the steps of:

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.

Preferably, also include after described step S3 sets up described pressure detecting model calculating pressure The step of 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.

Preferably, 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.

Preferably, in described step S12, the described pressure measured by described grating demodulation instrument The strain of conduit includes three strains: the first strain, the second strain and the 3rd strain；Wherein, First strain partitioning is the first radial strain and described first axial strain, and the second strain partitioning is Second radial strain and the second axial strain, the 3rd strain partitioning is the 3rd radial strain and the 3rd Axial strain；

Described three strains are obtained by the detection signal of three described grating pressure sensors is demodulated Arriving, three described grating pressure sensors are uniformly distributed in the one of the deformable body of described catheter pressure On individual circumference.

Preferably, in described step S2, utilize equation below calculate described first corrected parameter and 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, 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.

Preferably, in described step S4, calculate what described catheter pressure was subject to according to equation below 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.

Preferably, described 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.

The technique scheme of the present invention has the advantage that the method for the present invention can be accurate, simple Stress single, quickly detection catheter pressure.

Accompanying drawing explanation

Fig. 1 is the flow chart of a kind of method measuring catheter pressure stress of the present invention；

Fig. 2 is that in the present invention, catheter pressure connects grating sensor schematic diagram；

Fig. 3 is catheter pressure stress strength figure in the present invention.

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. 1 is the flow chart of a kind of method measuring catheter pressure stress of the present invention, the present invention Method comprise the 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.

The method of the present invention can stress accurate, simple, quickly detection catheter pressure

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.

Further, in described step S12, the described pressure measured by described grating demodulation instrument The strain of power conduit includes three strains: the first strain, the second strain and the 3rd strain；Its In, the first strain partitioning is the first radial strain and described first axial strain, and second answers variation Solution is the second radial strain and the second axial strain, the 3rd strain partitioning be the 3rd radial strain and 3rd axial strain；

Described three strains are obtained by the detection signal of three described grating pressure sensors is demodulated Arriving, three described grating pressure sensors are uniformly distributed in the one of the deformable body of described catheter pressure On individual circumference.

In described step S2, utilize equation below to calculate described first corrected parameter and second and revise 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.The bar of catheter pressure is by power During square bending, the strain of its material is being perpendicular to each layer of Impact direction all with distance center layer Distance increase and increase.The present invention installs three grating pressure on the deformable body of catheter pressure Sensor, its detection signal passes to grating demodulation instrument and is demodulated obtaining three strains, such as Fig. 2 Shown in.Three grid voltage force transducers are uniformly distributed on a circumference of described catheter pressure, i.e. Three grating pressure sensors are to become the formal distribution of 120 degree of angles in catheter pressure each other Axial direction a circumference on, described circumference is positive round, not oval other forms that wait Circular.

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, as shown in Figure 3.

Further, the method for the present invention 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.

Such as Fig. 3, the direction of conduit stress, i.e. conduit and tissue patch can be calculated by step S5 By time angle, it is simple to, it is judged that conduit head end with tissue recline area (because perpendicular contact and The area of parallel contact is different), to make corresponding adjustment.

Corresponding to the method for the present invention, open a kind of catheter pressure strained detection device, the present invention Device include: ergometer, for detecting the stress of catheter pressure；Grating pressure sensor, It is arranged on the deformable body of described catheter pressure, for detecting the strain signal of catheter pressure；Light Grid (FBG) demodulator, is connected with the grating pressure sensor of described catheter pressure, is used for demodulating described light The signal of grid voltage force transducer obtains the strain of described catheter pressure；And processor, with described Grating demodulation instrument connects, and utilizes stress and described grating demodulation that described ergometer measurement obtains Pressure detecting model is set up in the strain that instrument is measured, and utilizes by described grating solution during detection Strain and the described pressure detecting model of adjusting the described catheter pressure of instrument measurement are calculated described Radial force that 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..

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 (7)

1. the method measuring catheter pressure stress, it is characterised in that described method include with Lower step:

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.

Method the most according to claim 1, it is characterised in that described step S3 is set up After described pressure detecting model also include calculate pressure correction value step:

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.

Method the most according to claim 2, it is characterised in that described step S1 is concrete Comprise the 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.

Method the most according to claim 3, it is characterised in that in described step S12, The strain of described catheter pressure measured by 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 strain With described 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；

Described three strains are obtained by the detection signal of three described grating pressure sensors is demodulated Arriving, three described grating pressure sensors are uniformly distributed in the one of the deformable body of described catheter pressure On individual circumference.

Method the most according to claim 4, it is characterised in that in described step S2, 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.

Method the most according to claim 5, it is characterised in that described catheter pressure is Outer ply strain E_maxCalculated by equation below:

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

Wherein,

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

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

Method the most according to claim 6, it is characterised in that in described step S4, Including making a concerted effort that the described catheter pressure of calculating is subject to, formula is specially utilized to calculate:

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

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.