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High-precision fiber grating force sensor for measuring puncture force of minimally invasive surgery

A minimally invasive surgery, fiber grating technology, applied in the measurement of force, the measurement of force by measuring the change of the optical properties of the material when it is stressed, surgery, etc., can solve problems such as poor detection sensitivity, achieve small size, avoid chirp phenomenon, the effect of improving the ability to resist lateral interference

Pending Publication Date: 2022-03-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor detection sensitivity in the application of the existing fiber Bragg grating in the minimally invasive puncture force sensing technology, the present invention provides a coupling design of the sensor element fiber Bragg grating and a planar spring arranged in parallel, and develops a new type Force sensor for puncture force measurement in minimally invasive puncture surgery

Method used

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  • High-precision fiber grating force sensor for measuring puncture force of minimally invasive surgery
  • High-precision fiber grating force sensor for measuring puncture force of minimally invasive surgery
  • High-precision fiber grating force sensor for measuring puncture force of minimally invasive surgery

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Experimental program
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Embodiment 1

[0037] Embodiment 1: as Figures 1 to 7 As shown, a high-precision fiber grating force sensor for puncture force measurement in minimally invasive surgery is mainly composed of a sensor housing 1, a planar spring assembly 2, a fiber Bragg grating 3, a puncture needle 4, and a signal processing unit, wherein:

[0038] The interior of the sensing housing 1 is hollow, and the top of the sensor housing 1 is provided with a first optical fiber fixing part 31, and the first optical fiber fixing part 31 is provided with a first optical fiber installation groove 311, and the first optical fiber installation The groove 311 communicates with the inside of the sensor housing 1;

[0039] The planar spring assembly 2 is arranged inside the sensor housing 1 and is fixed to the side wall of the sensor housing 1; the planar spring assembly 2 is composed of two planar springs arranged in parallel and a connection and fixation of the two planar springs. The spring connector 23 is composed of; ...

Embodiment 2

[0047] Embodiment 2: as Image 6 As shown, a high-precision fiber grating force sensor for puncture force measurement in minimally invasive surgery is a preferred embodiment of embodiment 1, the difference is that the sensor housing 1 in this embodiment consists of a first housing 11, The second housing 12 and the third housing 13 are assembled together by screw connection; wherein: the first optical fiber fixing part 31 is arranged on the top of the first housing 11, and the first housing 11 and the second housing A first annular groove is provided between the body 12, and the first planar spring 21 is assembled in the first annular groove; a second annular groove is provided between the second shell 12 and the third housing 13, and the first Two planar springs 22 are assembled in the second annular groove.

[0048] Specifically, such as Image 6 As shown, the first housing 11 is a hollow cylindrical structure provided with internal thread segments; the second housing 12 is...

Embodiment 3

[0049] Embodiment 3: A high-precision fiber grating force sensor used for puncture force measurement in minimally invasive surgery. The difference from Embodiment 2 is that a hollow thread is provided between the first optical fiber fixing part and the first housing 11 of the 31 Section 14, the hollow threaded section 14 is provided with a central through hole connected with the first optical fiber installation groove 311; the force sensor is also provided with an external protective nut 5 connected with the hollow threaded section 14 , used to protect the fiber splicing point.

[0050] In the high-precision fiber grating force sensor described in Embodiment 3, the fiber Bragg grating 3 can be drawn out by an external protective nut 5 and connected to a signal processing unit, and the signal processing unit includes a fiber grating demodulator and a computer A system for converting an optical wavelength signal into a digital signal.

[0051] The specific working principle is ...

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Abstract

The invention relates to a high-precision fiber bragg grating force sensor for measuring puncture force in minimally invasive surgery, which comprises two plane springs, a fiber bragg grating, a sensor shell, a spring connecting piece, a puncture needle and a signal processing unit, deformation in the direction of the neutral axis of the sensor can be generated, and a puncture needle signal is converted into a grating strain signal; the optical fiber Bragg grating is hung between the sensor shell and the two plane springs under the action of pretightening force, axial strain can be generated under the action of puncture force, a strain signal is converted into an optical wavelength signal, and the sensor shell is used for fixing the optical fiber and the two plane springs; and the spring connecting piece is used for connecting and fixing the two plane springs. The sensor has the advantages of being high in resolution ratio, good in linearity, high in sensitivity and the like, can detect tiny puncture force changes, and is of great significance in assisting doctors in puncture operations and guaranteeing safety of patients.

Description

technical field [0001] The invention relates to the technical field of minimally invasive puncture force sensing, in particular to a high-precision optical fiber grating force sensor capable of accurately measuring the interaction force between a puncture needle and human tissue during minimally invasive puncture. Background technique [0002] In modern clinical medicine, puncture needle interventional surgery has increasingly become a common medical method. This method has been widely used in various minimally invasive percutaneous procedures, such as interventional radiology, neurosurgery, brachytherapy, drug delivery, cancer tissue diagnostic biopsy and blood sampling, etc. Compared with open surgery, puncture needle interventional surgery has the advantages of less incision and trauma, less risk of infection, less bleeding, shorter postoperative recovery time, and lower mortality rate. It is a minimally invasive method for accessing internal tissues and organs. Although...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24A61B90/00
CPCG01L1/246A61B90/06A61B2090/065
Inventor 史超阳唐中心王树新
Owner TIANJIN UNIV
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