CN104634609A - Metal wire tool for minimally invasive cutting of biological soft tissues - Google Patents
Metal wire tool for minimally invasive cutting of biological soft tissues Download PDFInfo
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- CN104634609A CN104634609A CN201510066828.1A CN201510066828A CN104634609A CN 104634609 A CN104634609 A CN 104634609A CN 201510066828 A CN201510066828 A CN 201510066828A CN 104634609 A CN104634609 A CN 104634609A
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- tinsel
- cutting
- cutter
- soft tissues
- soft tissue
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Abstract
The invention belongs to the technical fields of soft materials and experimental mechanics, and discloses a metal wire tool for minimally invasive cutting of biological soft tissues. The tool comprises a metal wire cutter and a vibration device, wherein a metal wire is subjected to surface etching through a chemical method and has a proper micro-nano texture; by combination with a reciprocating linear motion cutting mode provided by the vibration device, the adhesive power between the biological soft tissues and the tool can be effectively reduced when the biological soft tissues are cut; the to-be-exerted cutting force is reduced; the destructive effects on soft tissues in the cutting process are reduced; minimally invasive cutting is achieved; a sample with a precise physical dimension can be obtained by cutting; and the cut sample can relatively really reflect the mechanical property of the biological soft tissues. The tool is simple in manufacturing method, convenient and fast to operate, low in cost and convenient to produce and popularize.
Description
Technical field
The invention belongs to soft material and Experimental Mechanics technical field, relate to biologic soft tissue cutting, be related specifically to the tinsel cutter of a kind of Wicresoft cutting biologic soft tissue.
Background technology
Collide with in daily life, fall, a lot of accident such as traffic accident all may cause wound even threat to life in varying degrees to human tissue organ (as brain, liver, kidney etc.), for Forecasting Methodology and safeguard procedures effectively reliably can be developed, need the mechanical property of testing human soft tissue accurately, setting up suitable mechanical model, is the reference data that experimental verification and numerical simulation provide.In addition, obtain human body soft tissue accurately mechanical property to medical diagnosis, formulate operation plan etc. all there is important practical advice meaning.Because the Portions of soft tissue such as pig, ox organ mechanics performance is similar to corresponding human body soft tissue, in experiment, conventional its replaces tissue.Mechanics Performance Testing to be carried out to biologic soft tissue sample, need cutting to prepare the sample of certain specification size.Conventional method is the mould by manufacturing and designing certain specification shape, size, obtains sample by the method cutting being directly firmly pressed into biologic soft tissue.But the quality of biologic soft tissue is soft, and has stronger adhesiveness.Use the method in process of press in, soft tissue usually can be caused to produce larger distortion, and along with both contacts area increase after die nose enters biologic soft tissue, adhesion constantly increases, the cutting force of applying also needs corresponding increase; When taking-up mould is with when being separated cutting sample with mould, for overcoming adhesion between soft tissue and mould, also need to apply larger external force.In cutting process cutting force size, sampling time compelling force be all difficult to predicting and evaluating on the destruction of soft tissue and on the impact of soft tissue Viscous Elastic Mechanics performance.In addition, due to the existence of adhesion, sample can produce larger distortion in cutting process, is difficult to the sample obtaining precise geometrical size.Use physiological saline wet mold before cutting or spray physiological saline in cutting process, adhesive attraction between sample and mould can be reduced to a certain extent, but the method limited efficiency, poor controllability, complex operation.
Summary of the invention
The invention provides the tinsel cutter of a kind of Wicresoft cutting biologic soft tissue, this cutter utilizes chemical etching or machining process to form micro-nano texture in wire surface, in conjunction with straight-line oscillation cutting mode, reduce the adhesion effect in cutting process, effective minimizing cutting force, reduces the impact that cutting process produces sample mechanical property, realizes Wicresoft's cutting, cut surface can be made smooth simultaneously, cut out the sample of precise geometrical size.
The tinsel cutter involving vibrations device of Wicresoft of the present invention cutting biologic soft tissue and arch wire cutter two parts.
Vibrating device is used to provide linear reciprocating motion effect, to-and-fro movement arch wire cutter being done advance-cut-retreat-cut, the main cutting force of cutting soft tissue is become the tangential force on cut surface, the more static cutting of normal force significantly reduces, because reciprocating frequency is larger, tangential force direction changes very fast, damage on tangential to soft tissue hardly, use micro-nano texture surface tinsel to combine vibration cutting mode and effectively can reduce the cutting force needing to apply, Soft Tissue Deformation is also less.
The amplitude of described vibrating device need be greater than 3mm, and vibration frequency is not less than 30Hz.Described vibrating device can adopt medical reciprocating saw to realize.
Arch wire cutter comprises handle of a knife, arc intermediate plate, pad, bolt, nut and tinsel.Handle of a knife is used for connecting device of reciprocating vibration and arch wire cutter, by the two ends tension metal silk of screw bolt and nut at arc intermediate plate; Arc intermediate plate needs to use the large material of rigidity to prepare, and prevents it from deforming in assembling process.Shim clip is between bolt and arc intermediate plate, and pad should have certain elasticity, toughness and physical strength, can add the transfer scope of big nut, better control pretightning force, guarantees not produce destruction to tinsel when fastening metal silk simultaneously.
Described pad can adopt red steel paper pad.
Described tinsel can adopt molybdenum filament, copper wire etc., and tinsel will have suitable diameter, and diameter is excessive, and easily cause cutting force to increase, diameter is too small, install and cutting process in tinsel easily rupture.Described wire diameter scope: 0.08mm-0.3mm.
Described tinsel need have suitable surfaceness, cut contact time, too small, cross large roughness be all not easy cause stress concentrate thus weaken cutting effect.The roughness Ra scope of described wire surface: 20nm-800nm.
Described wire surface micro-nano texture can adopt chemical etching method (as FeCl
3,hCl, H
3pO
4, H
2o
2deng composition solution) obtain, machining process (as sandblasting, ball blast, electrosparking etc.) also can be adopted to carry out surface treatment acquisition.
Described tinsel can adopt low-surface-energy silicon fluoride (as 17 fluorine decyl trimethoxy silanes, ten trifluoro octyltri-ethoxysilane) process, by dehydration condensation between silicone hydroxyl and metal surface hydroxyl by fluorocarbon chain grafting to metal surface, formed and there is strong-hydrophobicity, strong oleophobic surface simultaneously, adhesion when reducing cutting and between biologic soft tissue.
Adopt tinsel to replace mould cutting, can reduce the contact area of sample and cutting tool, reduce adhesion between the two after cutting soft tissue, the cutting force of applying also can correspondingly reduce.Due to the existence of wire surface micro-nano texture, soft tissue and wire contact region uneven, effective contact area diminishes, can cut time cause stress concentrate, reduce cutting force.Simultaneously, owing to capturing large quantity of air in micro-nano texture, a water part in tissue is contacted with mattress, a part of with discrete micro-nano protuberance contacts, when water contacts with micro nano surface, water can not infiltrate in micro-nano texture, effective enhancing hydrophobicity wiry, is also conducive to the adhesive attraction reducing soft tissue.Because surface of contact reduces and the existence of micro-nano texture, can adhesive attraction be reduced equally when taking-up cutter and reduce externally applied forces, reducing the destruction to soft tissue.
Cutting test device by reference to the accompanying drawings shown in 1, also can cutting force size in real-time testing biologic soft tissue cutting process, also can be cut out the sample of accurate geometry size by parametric controller.Use stepper motor can control medical reciprocating saw 7 and move cutting sample 8 along rail plate 15 (being added with scale), rotation platform 13 can make circular platform 9 half-twist, the accurate movement of planar movement platform controlled round platform 9 in X-Y direction.
Effect of the present invention and benefit are to utilize chemical method etching method to obtain micro-nano texture in wire surface, in conjunction with the to-and-fro movement cutting mode that vibrating device provides, the adhesion between biologic soft tissue and cutter effectively can be reduced when cutting biologic soft tissue sample, reduce the required cutting force applied, reduce in cutting process the destruction that soft tissue produces, realize Wicresoft's cutting, and can the sample obtaining precise geometrical size be cut, make the sample of cutting more truly can reflect the mechanical property of biologic soft tissue.This cutter method for making is simple, and simple operation is with low cost, is convenient to produce and promote.
Accompanying drawing explanation
Fig. 1 is cutting test device schematic diagram.
Fig. 2 is the force-displacement curve etching molybdenum filament vibration cutting sheep brain in the embodiment of the present invention 2.
Fig. 3 (a) is molybdenum filament scanning electron microscope diagram before etching.
Fig. 3 (b) is molybdenum filament scanning electron microscope diagram after etching.
Fig. 4 (a) is molybdenum filament static contact angle survey sheet before etching.
Fig. 4 (b) is molybdenum filament static contact angle survey sheet after etching.
In figure: 1 handle of a knife; 2 arc intermediate plates; 3 red steel paper pads; 4 bolts; 5 nuts; 6 molybdenum filaments;
7 medical reciprocating saws; 8 samples; 9 circular platforms; 10 connecting links; 11, force snesor;
12 data acquisition processing systems; 13 rotation platforms; 14 XY mobile platforms; 15 rail plates;
16 stationary platforms.
Embodiment
Below in conjunction with technical scheme and accompanying drawing, the present invention is described further
Embodiment 1: surface of molybdenum wire under micro-nano texturing method:
(1) molybdenum filament (length: 10cm, diameter: 80 μm) is put into FeCl
3(FeCl in etching liquid
3with H
2the mass ratio of O is 4:15, also needs to add HCl, H
3pO
4, H
2o
2, itself and water volume ratio are 2:2:2:15), at room temperature etch 5min.
(2) take out molybdenum filament absolute ethyl alcohol ultrasonic cleaning 30s, clean surface of molybdenum wire under residue, dry in atmosphere.
(3) adopt scanning electron microscope (SEM) to observe the surface topography of molybdenum filament before and after etching, see accompanying drawing 3.
(4) adopt contact angle measurement to measure, by regulation and control micropin, 2 μ l water droplets are dripped in molybdenum filament, measure the static contact angle of water droplet surface of molybdenum wire under before and after etching.Before etching, static contact angle is 125 °; After etching, static contact angle is 141 °, as shown in Figure 4.
Embodiment 2:
(1) red steel paper pad 3, bolt 4 are respectively put a pair at arc intermediate plate about 2 aperture, slightly nutting 5, by the molybdenum filament 6 of etching circle on the spaced winding of the right and left rubber sheet gasket 3 and bolt 4 upper end, continue nutting 5.Rotating nut 5, by fastening for molybdenum filament 6, uses cyanoacrylate that the arc intermediate plate 2 installing molybdenum filament 6 is adhesive in handle of a knife 1 correct position.The molybdenum filament cutter head assembled is positioned on medical reciprocating saw 7 front end, more whole cutter is fixed on rail plate 15.
(2) fresh sheep brain tissue sample 8 is positioned over circular platform 9 center, open medical reciprocating saw 7, amplitude is 3mm, frequency is 30Hz, molybdenum filament cutter is driven to carry out linear reciprocating motion, control medical reciprocating saw 7 and be moved downward to incision sample to certain depth along rail plate 15 with the speed of 1mm/min, record force-displacement curve, is shown in accompanying drawing 2.
Claims (9)
1. a tinsel cutter for Wicresoft's cutting biologic soft tissue, comprises arch wire cutter and device of reciprocating vibration two part; It is characterized in that,
Device of reciprocating vibration is used to provide linear reciprocating motion, to-and-fro movement arch wire cutter being done advance-cut-retreat-cut, and the main cutting force of cutting soft tissue is become the tangential force on cut surface;
Arch wire cutter comprises handle of a knife, arc intermediate plate, pad, bolt, nut and tinsel; Handle of a knife is used for connecting device of reciprocating vibration and arch wire cutter; Screw bolt and nut is at the two ends tension metal silk of arc intermediate plate; Arc intermediate plate uses the large material of rigidity to prepare, and prevents it from deforming in assembling process; Shim clip, between bolt and arc intermediate plate, adds the transfer scope of big nut, better controls pretightning force, guarantees not produce destruction to tinsel when fastening metal silk simultaneously.
2. tinsel cutter according to claim 1, is characterized in that, described wire diameter: 0.08mm-0.3mm.
3. tinsel cutter according to claim 2, is characterized in that, the roughness Ra of described wire surface: 20nm-800nm.
4., according to the arbitrary described tinsel cutter of claim 1-3, it is characterized in that, the amplitude of described vibrating device need be greater than 3mm, and vibration frequency is not less than 30Hz.
5. tinsel cutter according to claim 4, is characterized in that, described device of reciprocating vibration adopts medical reciprocating saw, and described tinsel adopts molybdenum filament or copper wire.
6. the tinsel cutter knitted according to claim 1,2,3 or 5, is characterized in that, described pad adopts red steel paper pad.
7. the tinsel cutter knitted according to claim 4, is characterized in that, described tinsel obtains micro-nano texture by corrasion or adopts machining process to carry out surface treatment and obtains micro-nano texture.
8. the tinsel cutter knitted according to claim 6, is characterized in that, described tinsel obtains micro-nano texture by corrasion or adopts machining process to carry out surface treatment and obtains micro-nano texture.
9. the tinsel cutter knitted according to claim 7 or 8, it is characterized in that, described tinsel adopts low surface energy fluorine silane treatment, by dehydration condensation between silicone hydroxyl and metal surface hydroxyl by fluorocarbon chain grafting to metal surface, formed and there is strong-hydrophobicity, strong oleophobic surface simultaneously, adhesion when reducing cutting and between biologic soft tissue.
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CN201510066828.1A CN104634609A (en) | 2015-02-06 | 2015-02-06 | Metal wire tool for minimally invasive cutting of biological soft tissues |
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CN201510066828.1A CN104634609A (en) | 2015-02-06 | 2015-02-06 | Metal wire tool for minimally invasive cutting of biological soft tissues |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105619041A (en) * | 2016-02-29 | 2016-06-01 | 南京航空航天大学 | Preparation method of oleophobic cutter with micro-nano composite structure surface |
CN108175507A (en) * | 2017-08-31 | 2018-06-19 | 北京邮电大学 | Automatically control high-precision Soft tissue cutting robot |
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US4485706A (en) * | 1980-10-27 | 1984-12-04 | Disharoon Dale R | Methods and apparatus for cutting a substrate |
CN200950796Y (en) * | 2006-06-19 | 2007-09-26 | 大连通远食品有限公司 | Device for removing fish bone in cutting fish meat slices |
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2015
- 2015-02-06 CN CN201510066828.1A patent/CN104634609A/en active Pending
Patent Citations (4)
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US4051755A (en) * | 1976-10-07 | 1977-10-04 | Charles F. Kettering Foundation | Ultramicrotome and attachment therefore |
US4485706A (en) * | 1980-10-27 | 1984-12-04 | Disharoon Dale R | Methods and apparatus for cutting a substrate |
CN200950796Y (en) * | 2006-06-19 | 2007-09-26 | 大连通远食品有限公司 | Device for removing fish bone in cutting fish meat slices |
CN201203539Y (en) * | 2008-06-02 | 2009-03-04 | 兰峰 | Vibration type microtome for tissue culture |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105619041A (en) * | 2016-02-29 | 2016-06-01 | 南京航空航天大学 | Preparation method of oleophobic cutter with micro-nano composite structure surface |
CN105619041B (en) * | 2016-02-29 | 2018-02-16 | 南京航空航天大学 | A kind of preparation method of the oleophobic cutter with micro-nano compound structure surface |
CN108175507A (en) * | 2017-08-31 | 2018-06-19 | 北京邮电大学 | Automatically control high-precision Soft tissue cutting robot |
CN108175507B (en) * | 2017-08-31 | 2020-09-04 | 北京邮电大学 | Automatic control high accuracy soft tissue cutting robot |
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