High-precision differential type diaphragm optical fiber pressure sensing system

Abstract

The invention provides a high-precision differential type diaphragm optical fiber pressure sensing system. The high-precision differential type diaphragm optical fiber pressure sensing system comprises a puncture needle and a sensing probe, and further comprises an elastic diaphragm, wherein the puncture needle consists of a needle shell and a hollow needle cavity, the sensing probe is arranged inthe needle cavity, and the elastic diaphragm is nested in the inner wall of the needle shell and is arranged at the front end of the sensing probe; a needle tip is arranged at the front end of the puncture needle; the sensing probe and the elastic diaphragm are integrated in the part, close to the needle tip, of the needle cavity; the sensing probe comprises three sets of first optical fiber pressure sensors and a second optical fiber pressure sensor, wherein the first optical fiber pressure sensors are distributed in an annular array mode by taking the axis of the needle cavity as the center, and the second optical fiber pressure sensor is arranged on the axis line of the needle cavity; and the optical fiber pressure sensors performs differential type output with one input and two outputs. According to the high-precision differential type diaphragm optical fiber pressure sensing system, the measurement precision of the micro-strain force can be improved, the micro strain of the forcefrom the transverse direction and the axial direction can be sensed, particularly, the second optical fiber pressure sensor arranged on the axis line of the needle cavity can effectively improve theaxial strain precision, the interaction force sense information between the puncture needle and soft tissues can be enhanced, and therefore accurate control can be realized, and the safety of the operation can be improved.

Description

technical field [0001] The invention belongs to the technical field of micro-scale and high-precision optical fiber pressure sensing, and in particular relates to a high-precision differential diaphragm optical fiber pressure sensing system, which is suitable for minimally invasive surgery. Background technique [0002] In minimally invasive surgery, almost all minimally invasive surgery lacks the direct involvement of touch. Minimally invasive surgeons usually only obtain the proximal operating force of the surgical instrument, and the sensor is generally installed at the end of the minimally invasive surgical instrument (usually a puncture needle), such as figure 1 The external holding part 2 shown cannot directly obtain the direct force between the surgical instrument and the soft tissue, resulting in the lack of force sense information of the minimally invasive surgeon, who cannot sense the strain of the force more accurately. Invasive surgery carries risks. Moreover, ...

AI Technical Summary

Problems solved by technology

Minimally invasive surgeons usually only obtain the proximal operating force of the surgical instrument, and the sensor is generally installed at the end of the minimally invasive surgical instrument (usually a puncture needle), such as figure 1 The external holding part 2 shown cannot directly obtain the direct force between the surgical instrument and the soft tissue, resulting in the lack of force sense information for minimally invasive surgeons, who cannot more accurately sense the strain of the force, giving microscopic Invasive surgery carries risks

Moreover, most minimally invasive surgical instruments can only effectively sense small strains (Fx, Fy) from lateral forces, and are not so sensitive to small strains from axial forces (Fz)

Moreover, most optical fiber pressure sensors use an input and output optical fiber structure, and its light intensity is easily affected by the intensity of the light source, refractive index, etc., resulting in inaccurate detection, which greatly increases the uncertainty and risk factor of surgery.

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