Method for preestimating soft tissue puncturing friction coefficient of flexible needles
A friction coefficient and flexible needle technology, applied in the direction of measuring devices, instruments, mechanical devices, etc., can solve the problems of reducing tissue incision, reducing discomfort, and unable to control the needle tip, etc., to achieve easy installation, simple working principle, and save manpower Material effect
Inactive Publication Date: 2018-02-02
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
However, the traditional puncture surgery uses a rigid needle, which cannot effectively control the position of the needle tip. Due to uneven force on the needle tip and tissue deformation during puncture, the needle tip deviates from the intended target, resulting in puncture failure; therefore, for the traditional puncture needle However, foreign scholars have proposed the use of flexible needle control technology. The flexible needle uses a slender needle tube, which can reduce tissue incision, reduce discomfort, and speed up postoperative recovery. More importantly, the flexible needle can achieve curved trajectory.
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[0027] For implementation, refer to the attached figure 1 , attached figure 2 .
[0028] A method for estimating the coefficient of friction of soft tissue puncture with a flexible needle comprises the following steps:
[0029] Step 1: Use an electronic scale to measure the weight of the agar block used in the experiment ;
[0030] Step 2: The motor rotates, and the screw slide table pulls the agar block at a constant speed to move;
[0031] Step 3: The tension sensor measures the tension when the agar block moves at a constant speed ;
[0032] Step 4: According to the formula , to calculate the friction coefficient of the flexible needle penetrating soft tissue .
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The invention discloses a method for preestimating a soft tissue puncturing friction coefficient of flexible needles. According to results of previous studies, an agar block can be used as an experimental biomimetic material for substituting a soft tissue; a principle adopted by the invention is as follows: through movement of a screw sliding table, uniform movement of the agar block with known mass on a plane formed by paving a plurality of flexible needles can be achieved; one end of a tension sensor is fixedly connected to a tension sensor supporting plate, the other end of the tension sensor is fixedly connected to the baffle-free end of an agar block pulling rod, and the tension sensor is used for measuring a pulling force for dragging the agar block, namely a friction force for dragging the agar block at uniform speed; according to the relationship between the friction force and a positive pressure (namely the weight of the agar block), the soft tissue puncturing friction coefficient of the flexible needles can be worked out.
Description
technical field [0001] The invention relates to a method for estimating the friction coefficient of soft tissue punctured by a flexible needle, belonging to the technical field of friction coefficient measurement. Background technique [0002] Minimally invasive interventional medicine is a brand-new medical technology that has developed rapidly in recent years. It is an emerging medical method between surgery and internal medicine. Targeted puncture technology is one of the most promising medical methods. Traditional puncture surgery uses rigid needles, which cannot effectively control the position of the needle tip. Due to uneven force on the needle tip and tissue deformation during puncture, the needle tip deviates from the intended target, resulting in puncture failure; therefore, for traditional puncture needles However, foreign scholars have proposed the use of flexible needle control technology. The flexible needle uses a slender needle tube, which can reduce tissue i...
Claims
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IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 赵燕江黄磊胡海龙
Owner HARBIN UNIV OF SCI & TECH
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