CN103785089B - Nasal trachea cannula checks mirror - Google Patents
Nasal trachea cannula checks mirror Download PDFInfo
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- CN103785089B CN103785089B CN201410068229.9A CN201410068229A CN103785089B CN 103785089 B CN103785089 B CN 103785089B CN 201410068229 A CN201410068229 A CN 201410068229A CN 103785089 B CN103785089 B CN 103785089B
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Abstract
The invention discloses a kind of nasal trachea cannula and check mirror.Described nasal trachea cannula checks mirror, comprise eyepiece, radiation source and guiding tube, guiding tube one end is operation and observation section end, the other end is bendable portion end, is provided with in operation and observation section end the second operating grip that before and after control bendable portion, the first bending operating grip and control bendable portion bend right and left; Be provided with in guiding tube inside and disperse optical fibre channel, focusing optical fiber path and observe optical fibre channel, observe optical fibre channel bright dipping end, disperse optical fibre channel and focusing optical fiber path light inputting end is all positioned at operation and observation section end, observe optical fibre channel light inputting end, disperse optical fibre channel and focusing optical fiber path bright dipping end is all positioned at bendable portion end, eyepiece is arranged on observes optical fibre channel bright dipping end, and radiation source is arranged on disperses optical fibre channel and focusing optical fiber path light inputting end.The present invention accurately can not only stretch into trachea by guidance tracheal intubation, can also check whether pipe has foreign body or pathological changes simultaneously.
Description
Technical field
The present invention relates to a kind of tracheal intubation and check mirror, particularly a kind of nasal trachea cannula checks mirror.
Background technology
Endotracheal intubation has become cardio-pulmonary resuscitation and with the important measures in the Severe acute disease patient rescue process of respiratory dysfunction.Endotracheal intubation is important rescue technology conventional in rescue service, be in management of respiratory most widely used general, the most effectively, one of means the most efficiently, be the basic skill that medical worker must skillfully grasp, vital effect is played to rescue patient life, reduction case fatality rate.
Mostly stretch into trachea through oral cavity guidance tracheal intubation clinically, complete intubation, then external respirator in tracheal intubation, and then auxiliary have the Severe acute disease patient of respiratory dysfunction to complete respiratory movement.But patient etc. is closed for such as comatose patient, general anesthesia operation patient or tooth, trachea cannot be stretched into by oral cavity guidance tracheal intubation, and stretch into trachea through oral cavity guidance tracheal intubation and have following weak point: the misery brought to patient is large, affect patient normally to take food, and easily cause patient tired during long-time intubate, increase oral cavity infection chance.Although there is the technology that some per nasal guidance tracheal intubations stretch into trachea in prior art, but these technology are often depended on and are set right to tracheal intubation by oral cavity, to make tracheal intubation accurately stretch into tracheal strips, operation easier is large.
Summary of the invention
For the above-mentioned technical problem existed in prior art, the present invention proposes a kind of nasal trachea cannula and check mirror, easy to operate, accurately can stretch into tracheal strips by guidance tracheal intubation per nasal.
To achieve these goals, the present invention adopts following technical scheme:
Nasal trachea cannula checks mirror, comprise eyepiece, radiation source and guiding tube, described guiding tube one end is operation and observation section end, the other end is bendable portion end, is provided with in operation and observation section end the second operating grip that before and after control bendable portion, the first bending operating grip and control bendable portion bend right and left; Three optical fibre channels are provided with in guiding tube inside, namely disperse optical fibre channel, focusing optical fiber path and observe optical fibre channel, wherein, observe optical fibre channel bright dipping end, disperse optical fibre channel and focusing optical fiber path light inputting end is all positioned at operation and observation section end, observe optical fibre channel light inputting end, disperse optical fibre channel and focusing optical fiber path bright dipping end is all positioned at bendable portion end, eyepiece is arranged on observes optical fibre channel bright dipping end, and radiation source is arranged on disperses optical fibre channel and focusing optical fiber path light inputting end.
Further, be provided with paired observation eyeglass between above-mentioned eyepiece and observation optical fibre channel, this paired observation eyeglass is the circular eyeglass combined by several monochromatic fan-shaped glass lens, and the fan-shaped glass lens of described monochrome is selected an aligning and observed optical fibre channel bright dipping end.
Further, above-mentioned paired observation eyeglass is detachable eyeglass.
Further, at bendable portion end, described guiding tube inside is provided with multiple bending section back-up block be connected along guiding tube length direction order, bending section back-up block is the square shape of four, front, rear, left and right corner point end all in tetrapyamid shape, and each corner point is on the summit of corresponding rectangular pyramid respectively; Each corner point end is offered respectively a drift angle perforation; First operating grip is wound around the rear control bracing wire that connects the front control bracing wire of the sinciput angle point end of each bending section back-up block and the rear corner point end of an each bending section back-up block of connection, front control bracing wire is contrary with the winding direction of rear control bracing wire on the first operating grip; Second operating grip is wound around the right control bracing wire that connects the left control bracing wire of the left corner point end of each bending section back-up block and the right corner point end of an each bending section back-up block of connection, left control bracing wire is contrary with the winding direction of right control bracing wire on the second operating grip; Article three, optical fibre channel passes through from the middle part of each bending section back-up block.
Further, the middle part of above-mentioned bending section back-up block offers the first cylindric through hole, this first cylindric through hole comprises the top perforate being positioned at bending section back-up block upper surface and the bottom perforate being positioned at bending section back-up block lower surface, and the diameter of bottom perforate is less than the diameter of section of the first cylindric through hole remainder; Above bending section back-up block, be provided with the first annular stile be connected with perforate edge, top, the upper edge of the first annular stile is provided with annular horizontal flange; First annular stile inside offers first central hole and a first annular optical fibre channel perforation be wrapped in outside this first central hole, first annular optical fibre channel perforation is made up of three the first fan-shaped perforation linkings, and three optical fibre channels pass through from one of them first fan-shaped perforated inner respectively; First annular stile stretches into the first cylindric through hole inside that adjacent flex portion back-up block is offered; The first annular stile between annular horizontal flange and bending section back-up block upper surface is arranged with coil tension spring; The diameter of the external diameter of annular horizontal flange, the diameter of coil tension spring, bottom perforate is closed and is: the diameter of the diameter > bottom perforate of the external diameter > coil tension spring of annular horizontal flange.
Further, aforesaid operations and observation section end are provided with the 3rd regulating handle, 3rd regulating handle is wound around the central pull that an article connects the first central hole of each bending section back-up block, a tension adjustment spring is respectively set in the operation and observation section end of central pull He on bendable portion end.
Further, above-mentioned guiding tube inside is also provided with multiple cylindrical support block be connected along guiding tube length direction order, and cylindrical support block is provided with four the control bracing wire perforation be drawstring through for front control bracing wire, rear control bracing wire, left control bracing wire and right control; Article three, optical fibre channel passes through from the middle part of each cylindrical support block.
Further, above-mentioned guiding tube inside is also provided with multiple cylindrical support block be connected along guiding tube length direction order, and cylindrical support block is provided with four the control bracing wire perforation be drawstring through for front control bracing wire, rear control bracing wire, left control bracing wire and right control; The middle part of cylindrical support block offers the second cylindric through hole, above cylindrical support block, be provided with the second annular stile that through hole upper edge cylindric with second is connected, the second annular stile stretches into the second cylindric through hole inside that adjacent column shape back-up block is offered; Second annular stile inside offers second central hole and a second annular optical fibre channel perforation be wrapped in outside this second central hole, second annular optical fibre channel perforation is made up of three the second fan-shaped perforation linkings, and three optical fibre channels pass through from one of them second fan-shaped perforated inner respectively; Central pull connects the second central hole of each cylindrical support block.
Advantage of the present invention is:
The nasal trachea cannula that the present invention addresses checks mirror, for oral trachea cannula, the diameter of guiding tube obviously reduces, the present invention is by the coordinated of eyepiece, radiation source, guiding tube and three optical fibre channels, accurately can stretch into trachea by guidance tracheal intubation, be beneficial to the inconvenience overcoming oral trachea cannula technology and bring, operation easier obviously reduces; In addition, the present invention can also check whether pipe has foreign body or diseased region while tracheal intubation guiding is entered trachea, facilitates medical personnel to understand the state of patient respiration passage.
Accompanying drawing explanation
Fig. 1 is the structural representation that in the present invention, nasal trachea cannula checks mirror, and in figure, nasal trachea cannula checks that mirror is in non-case of bending;
Fig. 2 is the structural representation that in the present invention, nasal trachea cannula checks mirror, and in figure, nasal trachea cannula checks that mirror is in curving state;
Fig. 3 is A portion enlarged drawing in Fig. 1;
Fig. 4 is B portion enlarged drawing in Fig. 1;
Fig. 5 is the top view of bending section back-up block in the present invention;
Fig. 6 is the side view of bending section back-up block in the present invention;
Fig. 7 is structural representation when adjacent two bending section back-up blocks are connected in the present invention;
Fig. 8 is the top view of cylindrical support block in the present invention;
Fig. 9 is the side view of cylindrical support block in the present invention;
Figure 10 is structural representation when adjacent two cylindrical support blocks are connected in the present invention;
Figure 11 is the structural representation of paired observation eyeglass in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
Shown in composition graphs 1 to Fig. 4, nasal trachea cannula checks mirror, comprises eyepiece 101, radiation source 102 and guiding tube 103.Guiding tube 103 one end is operation and observation section end I, and the other end is bendable portion end II.
The first operating grip 104 and the second operating grip 105 is provided with in operation and observation section end I.First operating grip 104 bends for controlling bendable portion fore-and-aft direction, and the second operating grip 105 bends for controlling bendable portion left and right directions.There are three optical fibre channels in guiding tube 103 inside, namely disperse optical fibre channel 106, focusing optical fiber path 107 and observe optical fibre channel 108.Wherein, observe optical fibre channel 108 bright dipping end, disperse optical fibre channel 106 and focusing optical fiber path 107 light inputting end is all positioned at operation and observation section end I, observe optical fiber 108 path light inputting end, disperse optical fibre channel 106 and focusing optical fiber path 107 bright dipping end is all positioned at bendable portion end II, eyepiece 101 is arranged on observes optical fibre channel 108 bright dipping end, for observing the image frame that bendable portion end II place passes back, being convenient to observe nasal trachea cannula and checking that mirror stretches into situation and whether pipe has foreign body or diseased region.Radiation source 102 is arranged on disperses optical fibre channel 106 and focusing optical fiber path 107 light inputting end, and radiation source 102 preferably adopts cold light source.
Irradiated by radiation source 102 and disperse optical fibre channel 106 and focusing optical fiber path 107 light inputting end, light is along dispersing optical fibre channel 106 and focusing optical fiber path 107 arrives bendable portion end II.Divergence of beam can be come owing to dispersing optical fibre channel 106, therefore bendable portion end II place scene can be lighted, be convenient to accurate guidance tracheal intubation and stretch into trachea, disperse optical fibre channel 106 light well to be converged on some positions to be seen, therefore set up focusing optical fiber path 107 and can be used for a certain concrete position of close-ups as the position with foreign body or pathological changes, enrich the function of tracheal intubation bootstrap technique.Observing optical fibre channel 108 is passed on eyepiece 101 by the image frame at bendable portion end II place, guides and observe for medical personnel.
Preferably, between eyepiece 101 and observation optical fibre channel 108, be provided with paired observation eyeglass 109, paired observation eyeglass 109 is the circular eyeglass combined by several monochromatic fan-shaped glass lens 110, as shown in figure 11.The impact of color exposure light source 102 light source color selected by paired observation eyeglass 109, more can give prominence to the position of pipe foreign body or pathological changes.Paired observation eyeglass 109 is detachable eyeglass, paired observation eyeglass 109 can be taken off when guidance tracheal intubation enters trachea; At eyepiece 101 and observe installation Comparison viewing lens 109 between optical fibre channel 108 when a certain foreign body of concrete observation trachea or diseased region, by rotating paired observation eyeglass 109, make to observe optical fibre channel 108 bright dipping end and aim at the fan-shaped glass lens 110 of a certain monochrome, highlight foreign body or diseased region.
At bendable portion end II, guiding tube 103 inside is provided with multiple bending section back-up block 111, and each bending section back-up block 111 is connected along guiding tube 103 length direction order.
Bending section back-up block 111 is the square shape of four, front, rear, left and right corner point end all in tetrapyamid shape.Concrete, bending section back-up block 111 is obtained by following steps processing:
First get the cube block of one piece of regular shape, four vertical rib mid points along cube block cut the upper cutting face of formation one and a lower cutting face respectively obliquely and obliquely, and the angle of cutting obliquely is identical with the angle of cutting obliquely.
Each corner point is on the summit of corresponding rectangular pyramid respectively; Through cutting two opposite flanks of upper cutting face and the lower cutting face formation rectangular pyramid formed, each corner point end is offered respectively a drift angle perforation 112.
First operating grip 104 is wound around the rear control bracing wire 114 that connects the front control bracing wire 113 of the sinciput angle point end of each bending section back-up block and the rear corner point end of an each bending section back-up block of connection, front control bracing wire 113 is contrary with the winding direction of rear control bracing wire 114 on the first operating grip 104; Second operating grip 105 is wound around the right control bracing wire 116 that connects the left control bracing wire 115 of the left corner point end of each bending section back-up block and the right corner point end of an each bending section back-up block of connection, left control bracing wire 115 is contrary with the winding direction of right control bracing wire 116 on the second operating grip; Article three, optical fibre channel passes through from the middle part of each bending section back-up block 111.
By rotating the first operating grip 104 clockwise or counterclockwise, the elasticity of front control bracing wire 113 and rear control bracing wire 114 can be controlled: concrete, when current control bracing wire 113 is wound around further on the first operating grip 104, can be furthered the sinciput angle point end distance of adjacent two bending section back-up blocks 111, and then make guiding tube 103 lateral bend forward, on the contrary, if when rear control bracing wire 114 is wound around further on the first operating grip 104, can be furthered the rear corner point end distance of adjacent two bending section back-up blocks 111, and then make guiding tube 103 lateral bend backward,
In like manner, when left control bracing wire 115 is wound around further on the second operating grip 105, can be furthered the left corner point end distance of adjacent two bending section back-up blocks 111, and then guiding tube 103 is bent to the left, on the contrary, if when right control bracing wire 116 is wound around further on the second operating grip 105, the right corner point end distance of adjacent two the bending section back-up blocks 111 that can further, and then guiding tube 103 is bent to the right.
Concrete, as shown in Figure 5 and Figure 6, the middle part of bending section back-up block 111 offers the first cylindric through hole 127, this first cylindric through hole comprises the top perforate 128 being positioned at bending section back-up block upper surface and the bottom perforate 129 being positioned at bending section back-up block lower surface, and the diameter of bottom perforate 129 is less than the diameter of section of the first cylindric 127 through hole remainders; The upper edge being provided with the annular stile of the first annular stile 119, first be connected with perforate edge, top above bending section back-up block 111 is provided with annular horizontal flange 130; First annular stile 119 inside offers first central hole 117 and a first annular optical fibre channel perforation be wrapped in outside this first central hole, first annular optical fibre channel perforation is connected by three the first fan-shaped perforation 118 and forms, and three optical fibre channels pass through from one of them first fan-shaped perforation 118 inside respectively; First annular stile 119 stretches into the first cylindric through hole 127 inside that adjacent flex portion back-up block is offered, as shown in Figure 7; Between annular horizontal flange 130 and bending section back-up block 111 upper surface first annular stile 119 is arranged with coil tension spring 131; The diameter of the external diameter of annular horizontal flange, the diameter of coil tension spring, bottom perforate is closed and is: the diameter of the diameter > bottom perforate of the external diameter > coil tension spring of annular horizontal flange.
In addition, multiple cylindrical support block 120 be connected along guiding tube length direction order is also provided with in guiding tube inside, cylindrical support block is provided with four control bracing wires perforation 121, front control bracing wire, rear control bracing wire, left control bracing wire and right control bracing wire respectively from one of them control bracing wire perforation through; Article three, optical fibre channel passes through from the middle part of each cylindrical support block 120.
Concrete, shown in composition graphs 8 and Fig. 9, the middle part of cylindrical support block 120 offers the second cylindric through hole 132, the second annular stile 124 that through hole 132 upper edge cylindric with second is connected is provided with above cylindrical support block, second annular stile 124 stretches into the second cylindric through hole 132 inside that adjacent column shape back-up block is offered, as shown in Figure 10; Second annular stile 124 inside offers second central hole 122 and a second annular optical fibre channel perforation be wrapped in outside this second central hole, second annular optical fibre channel perforation is connected by three the second fan-shaped perforation 123 and forms, and three optical fibre channels pass through from one of them second fan-shaped perforation 123 inside respectively.
Operation and observation section end I are provided with the 3rd regulating handle 125,3rd regulating handle 125 is wound around one article of central pull 126, central pull 126 connects the first central hole 117 of each bending section back-up block 111 and the second central hole 122 of each cylindrical support block 120 successively, in the operation and observation section end I of central pull 126 He on bendable portion end II, a tension adjustment spring (not shown) is respectively set, 3rd regulating handle 125, for regulating the rate of tension of guiding tube 103, is avoided guiding tube overrelaxation or excessively tightens.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this description; made all equivalently to substitute, obvious variant, within the essential scope all dropping on this description, protection of the present invention ought to be subject to.
Claims (4)
1. nasal trachea cannula checks mirror, comprise eyepiece, radiation source and guiding tube, it is characterized in that, described guiding tube one end is operation and observation section end, the other end is bendable portion end, is provided with in operation and observation section end the second operating grip that before and after control bendable portion, the first bending operating grip and control bendable portion bend right and left; Three optical fibre channels are provided with in guiding tube inside, namely disperse optical fibre channel, focusing optical fiber path and observe optical fibre channel, wherein, observe optical fibre channel bright dipping end, disperse optical fibre channel and focusing optical fiber path light inputting end is all positioned at operation and observation section end, observe optical fibre channel light inputting end, disperse optical fibre channel and focusing optical fiber path bright dipping end is all positioned at bendable portion end, eyepiece is arranged on observes optical fibre channel bright dipping end, and radiation source is arranged on disperses optical fibre channel and focusing optical fiber path light inputting end; Be provided with paired observation eyeglass between described eyepiece and observation optical fibre channel, this paired observation eyeglass is the circular eyeglass combined by several monochromatic fan-shaped glass lens, and the fan-shaped glass lens of described monochrome is selected an aligning and observed optical fibre channel bright dipping end; Described paired observation eyeglass is detachable eyeglass; At bendable portion end, described guiding tube inside is provided with multiple bending section back-up block be connected along guiding tube length direction order, bending section back-up block is the square shape of four, front, rear, left and right corner point end all in tetrapyamid shape, and each corner point is on the summit of corresponding rectangular pyramid respectively; Each corner point end is offered respectively a drift angle perforation; First operating grip is wound around the rear control bracing wire that connects the front control bracing wire of the sinciput angle point end of each bending section back-up block and the rear corner point end of an each bending section back-up block of connection, front control bracing wire is contrary with the winding direction of rear control bracing wire on the first operating grip; Second operating grip is wound around the right control bracing wire that connects the left control bracing wire of the left corner point end of each bending section back-up block and the right corner point end of an each bending section back-up block of connection, left control bracing wire is contrary with the winding direction of right control bracing wire on the second operating grip; Article three, optical fibre channel passes through from the middle part of each bending section back-up block; The middle part of described bending section back-up block offers the first cylindric through hole, this first cylindric through hole comprises the top perforate being positioned at bending section back-up block upper surface and the bottom perforate being positioned at bending section back-up block lower surface, and the diameter of bottom perforate is less than the diameter of section of the first cylindric through hole remainder; Above bending section back-up block, be provided with the first annular stile be connected with perforate edge, top, the upper edge of the first annular stile is provided with annular horizontal flange; First annular stile inside offers first central hole and a first annular optical fibre channel perforation be wrapped in outside this first central hole, first annular optical fibre channel perforation is made up of three the first fan-shaped perforation linkings, and three optical fibre channels pass through from one of them first fan-shaped perforated inner respectively; First annular stile stretches into the first cylindric through hole inside that adjacent flex portion back-up block is offered; The first annular stile between annular horizontal flange and bending section back-up block upper surface is arranged with coil tension spring; The diameter of the external diameter of annular horizontal flange, the diameter of coil tension spring, bottom perforate is closed and is: the diameter of the diameter > bottom perforate of the external diameter > coil tension spring of annular horizontal flange.
2. nasal trachea cannula according to claim 1 checks mirror, it is characterized in that, described operation and observation section end are provided with the 3rd regulating handle, 3rd regulating handle is wound around the central pull that an article connects the first central hole of each bending section back-up block, a tension adjustment spring is respectively set in the operation and observation section end of central pull He on bendable portion end.
3. nasal trachea cannula according to claim 1 checks mirror, it is characterized in that, described guiding tube inside is also provided with multiple cylindrical support block be connected along guiding tube length direction order, and cylindrical support block is provided with four the control bracing wire perforation be drawstring through for front control bracing wire, rear control bracing wire, left control bracing wire and right control; Article three, optical fibre channel passes through from the middle part of each cylindrical support block.
4. nasal trachea cannula according to claim 2 checks mirror, it is characterized in that, described guiding tube inside is also provided with multiple cylindrical support block be connected along guiding tube length direction order, and cylindrical support block is provided with four the control bracing wire perforation be drawstring through for front control bracing wire, rear control bracing wire, left control bracing wire and right control; The middle part of cylindrical support block offers the second cylindric through hole, above cylindrical support block, be provided with the second annular stile that through hole upper edge cylindric with second is connected, the second annular stile stretches into the second cylindric through hole inside that adjacent column shape back-up block is offered; Second annular stile inside offers second central hole and a second annular optical fibre channel perforation be wrapped in outside this second central hole, second annular optical fibre channel perforation is made up of three the second fan-shaped perforation linkings, and three optical fibre channels pass through from one of them second fan-shaped perforated inner respectively; Central pull connects the second central hole of each cylindrical support block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068229.9A CN103785089B (en) | 2014-02-27 | 2014-02-27 | Nasal trachea cannula checks mirror |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068229.9A CN103785089B (en) | 2014-02-27 | 2014-02-27 | Nasal trachea cannula checks mirror |
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| Publication Number | Publication Date |
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| CN103785089A CN103785089A (en) | 2014-05-14 |
| CN103785089B true CN103785089B (en) | 2016-01-20 |
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| CN201410068229.9A Expired - Fee Related CN103785089B (en) | 2014-02-27 | 2014-02-27 | Nasal trachea cannula checks mirror |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105640485A (en) * | 2016-03-29 | 2016-06-08 | 广州医科大学附属第医院 | Airway environment monitoring device |
| CN106510859A (en) * | 2016-12-31 | 2017-03-22 | 重庆市光利医疗科技有限公司 | Lighting device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192134A (en) * | 1986-02-17 | 1987-08-22 | オリンパス光学工業株式会社 | Curved part device for endoscope |
| DE3725114A1 (en) * | 1987-07-29 | 1989-02-09 | Wolf Gmbh Richard | STROBOSCOPE LIGHT GENERATOR FOR PARTICULAR MEDICAL PURPOSES |
| US5005558A (en) * | 1988-05-16 | 1991-04-09 | Kabushiki Kaisha Toshiba | Endoscope |
| US20040199052A1 (en) * | 2003-04-01 | 2004-10-07 | Scimed Life Systems, Inc. | Endoscopic imaging system |
| EP1661505B1 (en) * | 2003-09-05 | 2014-12-31 | Olympus Corporation | Endoscope |
| KR100867656B1 (en) * | 2007-07-03 | 2008-11-10 | 주식회사 케어텍 | Bending section for endoscope |
| CN203724584U (en) * | 2014-02-27 | 2014-07-23 | 青岛大学医学院附属医院 | Nasal trachea cannula checking endoscope |
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Inventor after: Mao Chenggang Inventor after: Xue Wenting Inventor after: Xiao Yitai Inventor after: Li Shouying Inventor after: Han Yan Inventor after: Yu Xiaoyan Inventor before: Mao Chenggang Inventor before: Xiao Yitai Inventor before: Xue Wenting Inventor before: Li Shouying Inventor before: Han Yan Inventor before: Yu Xiaoyan |
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