CN104665940A - Root canal foreign object extractor - Google Patents
Root canal foreign object extractor Download PDFInfo
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- CN104665940A CN104665940A CN201510073904.1A CN201510073904A CN104665940A CN 104665940 A CN104665940 A CN 104665940A CN 201510073904 A CN201510073904 A CN 201510073904A CN 104665940 A CN104665940 A CN 104665940A
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- bracing
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- swing arm
- lower bracing
- foreign body
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Abstract
The invention relates to a root canal foreign object extractor. The extractor comprises a sleeve, a rod part which is inserted in a sleeve in a sliding manner and an operation mechanism which is used for operating the rod part to slide in the sleeve, wherein a bulge loop is arranged on the inner wall face of the lower part of the sleeve; a conical part is arranged at the lower end part of the rod part; the conical part of the rod part slides to the bulge loop of the sleeve and is used for taking out a foreign object by matching with the bulge loop of the sleeve; the operation mechanism comprises an upper linking strip of which one end part is connected to the upper end part of the rod part, a lower linking strip of which one end is connected to the sleeve, and an operation part which is connected between the upper linking strip and the lower linking strip and is used for enabling one end part of the upper linking strip and one end part of the lower linking strip to be relatively close or separated; and the operation part is operated to drive the rod part to slide in the sleeve. The root canal foreign object extractor can be used for operating in the oral cavity by a single hand and conveniently taking out a foreign object from the root canal, and is compact in structure, reliable in operation and convenient to operate.
Description
Technical field
the present invention relates to gear division medical instruments field, particularly relate to a kind of root pipe foreign body extractor.
Background technology
gear division root canal is basic skills and the optimum selection of dental pulp disease and periapical disease, can prevent periapical lesion or promote the healing of periapical lesion that occurred.In gear division Micro-Endodontics process, fracture sometimes for cutting the Dentinal apparatus of infection, root pipe ring is used to bore to remove the apparatus that can make to fracture of a small amount of dentin around the apparatus that fractures to loosen, root pipe foreign body extractor is adopted to take out in root pipe the apparatus that fractures again, but existing gear division root pipe foreign body extractor suffers from the operation of tooth place, convenient not, and operation sight line and illuminating ray can be blocked, reduce the therapeutic effect of operation.
Summary of the invention
the object of this invention is to provide a kind of can the root pipe foreign body extractor of one-handed performance.
for achieving the above object, the technical solution used in the present invention is:
a kind of root pipe foreign body extractor, comprise sleeve pipe, the rod member be plugged in described sleeve pipe slided, the internal face of described casing part has bulge loop, the bottom of described rod member has tapered portion, the bulge loop place that the tapered portion of described rod member slides into described sleeve pipe coordinates with it and carries out getting thing, described root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in described sleeve pipe for operating described rod member, described operating mechanism comprises the upper bracing that an end is connected to described rod member upper end, one end is connected to the lower bracing on described sleeve pipe, be connected between described upper bracing and lower bracing for make described upper bracing relative with an end of lower bracing near or away from operating parts, rod member described in operating parts described in operation drives slides in described sleeve pipe.
preferably, described upper bracing is bracing in elasticity, and described lower bracing is bracing under elasticity, and described upper bracing, the other end of lower bracing are connected.
further preferably, described operating parts comprises lever post in inverted T shape and pressing plate, the end of described lever post has hook part, described pressing plate comprises a bending part, described upper bracing, lower bracing are offered porose, described lever post is successively through the hole of described lower bracing, upper bracing, and the hook part of described lever post is through the hole of described upper bracing, and an end of described pressing plate is fastened between the hook part of described upper bracing and described lever post.
further preferably, described operating parts comprises the chute push pedal being arranged on described upper bracing upper surface that an end is fixed on pin on described lower bracing, slip, the other end of described pin has ailhead, described upper bracing is offered porose, described pin is through the hole of described upper bracing, described ailhead is positioned at the top of described upper bracing, and the chute push pedal described in slip can be fastened between described upper bracing and described ailhead.
preferably, described upper bracing is bracing in rigidity, and described lower bracing is bracing under rigidity, and described lower bracing is connected with reed seat, is connected with flexure strip between described reed seat and the upper surface of upper bracing.
further preferably, described operating parts comprises turn screw, and described upper bracing offers screwed hole, and described turn screw is threaded with described screwed hole, and the end of described turn screw is against described lower bracing upper surface.
further preferably, described operating parts comprises positive and negative tooth swing arm, revolve and be located at positive tooth nut on described positive and negative tooth swing arm and anti-tooth nut, be fixed on the knob on described positive and negative tooth swing arm, described upper bracing, lower bracing is offered porose, described positive and negative tooth swing arm is through described upper bracing, the hole of lower bracing, described positive tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described upper bracing and is against on described flexure strip, described anti-tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described lower bracing and is fixed on the lower surface of described lower bracing.
further preferably, the other end of described lower bracing is connected with lever, is equipped with the screw rod that can prolong its length direction and slide, described screw rod is provided with by its locking nut of locking relative to lever in described lever.
preferably, described described upper bracing is bracing in rigidity, and described lower bracing is bracing under rigidity, and described upper bracing, the other end of lower bracing are connected by elastic ring.
further preferably, described operating parts comprises positive and negative tooth swing arm, revolve and be located at positive tooth nut on described positive and negative tooth swing arm and anti-tooth nut, be fixed on the knob on described positive and negative tooth swing arm, described upper bracing, lower bracing is offered porose, described positive and negative tooth swing arm is through described lower bracing, the hole of lower bracing, described positive tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described upper bracing and is against on the upper surface of described upper bracing, described anti-tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described lower bracing and is fixed on the lower surface of described lower bracing.
because technique scheme is used, the present invention compared with prior art has following advantages and effect:
the application can take out with one-handed performance the apparatus fractureed in root pipe easily outside oral cavity, compact conformation, reliable operation, easy to operate.
Accompanying drawing explanation
accompanying drawing 1 is the partial schematic diagram (not getting thing state) of sleeve pipe and rod member;
accompanying drawing 2 is the partial schematic diagram (getting thing state) of sleeve pipe and rod member;
accompanying drawing 3 is the front view (not getting thing state) of embodiment one;
accompanying drawing 4 is the top view of embodiment one;
accompanying drawing 5 is the front view (getting thing state) of embodiment one;
accompanying drawing 6 is the front view of embodiment two;
accompanying drawing 7 is the top view of embodiment two;
accompanying drawing 8 is the front view of embodiment three;
accompanying drawing 9 is the front view of embodiment four;
accompanying drawing 10 is the front view of embodiment five.
wherein: 1, sleeve pipe; 10, bulge loop; 2, rod member; 20, tapered portion; 3, upper bracing; 4, lower bracing; 50, lever post; 500, hook part; 51, pressing plate; 510, bending part; 60, pin; 600, ailhead; 61, chute push pedal; 70, reed seat; 71, flexure strip; 72, turn screw; 80, positive and negative tooth swing arm; 81, positive tooth nut; 82, anti-tooth nut; 83, knob; 90, elastic ring; 100, lever; 101, screw rod; 102, locking nut; 0, screw.
Detailed description of the invention
below in conjunction with accompanying drawing and case study on implementation, the invention will be further described:
embodiment one:
a kind of root pipe foreign body extractor as Figure 1-5, the wedge rod member 2 be plugged in sleeve pipe 1 comprise wedge sleeve pipe 1, sliding, the internal face of sleeve pipe 1 bottom has bulge loop 10, the bottom of rod member 2 has tapered portion 20, and the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 coordinates with it and carries out getting thing.
root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in sleeve pipe 1 for operating rod member 2, operating mechanism comprise upper bracing 3, end that an end is connected to rod member 2 upper end be connected to lower bracing 4 on sleeve pipe 1, be connected between bracing 3 and lower bracing 4 for make upper bracing 3 relative with an end of lower bracing 4 near or away from operating parts, operation operating parts drives rod member 2 to slide in sleeve pipe 1.Wherein: the upper end of rod member 2 is connected by screw 0 with between upper bracing 3.
in the present embodiment: upper bracing 3 is bracing in elasticity, and lower bracing 4 is bracing under elasticity, and the other end of upper bracing 3, lower bracing 4 is connected.Operating parts comprises lever post 50 in inverted T shape and pressing plate 51, the end of lever post 50 has hook part 500, pressing plate 51 comprises a bending part 510, upper bracing 3, lower bracing 4 are offered porose, lever post 50 is successively through the hole of lower bracing 4, upper bracing 3, and the hook part 500 of lever post 50 is through the hole of upper bracing 3, and an end of pressing plate 51 is fastened between the hook part 500 of bracing 3 and lever post 50.During operation: the other end pressing down pressing plate 51, the bending part 510 of pressing plate 51 be against bracing 3 upper surface and with bending part 510 for turning point rotates, the hook part 500 of lever post 50 is upwards carried in the other end of pressing plate 51, make bracing 3 relative close with an end of lower bracing 4, be connected to rod member 2 slide downward in sleeve pipe on bracing 3, until the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 has coordinated with it get thing, one hand can complete.
embodiment two:
a kind of root pipe foreign body extractor as shown in Fig. 1-2,6-7, the wedge rod member 2 be plugged in sleeve pipe 1 comprise wedge sleeve pipe 1, sliding, the internal face of sleeve pipe 1 bottom has bulge loop 10, the bottom of rod member 2 has tapered portion 20, and the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 coordinates with it and carries out getting thing.
root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in sleeve pipe 1 for operating rod member 2, operating mechanism comprise upper bracing 3, end that an end is connected to rod member 2 upper end be connected to lower bracing 4 on sleeve pipe 1, be connected between bracing 3 and lower bracing 4 for make upper bracing 3 relative with an end of lower bracing 4 near or away from operating parts, operation operating parts drives rod member 2 to slide in sleeve pipe 1.Wherein: the upper end of rod member 2 is connected by screw 0 with between upper bracing 3.
in the present embodiment: upper bracing 3 is bracing in elasticity, and lower bracing 4 is bracing under elasticity, and the other end of upper bracing 3, lower bracing 4 is connected.Operating parts comprises the chute push pedal 61 being arranged on bracing 3 upper surface that an end is fixed on pin 60 on lower bracing 4, slides, the other end of pin 60 has ailhead 600, upper bracing 3 is offered porose, pin 60 is through the hole of upper bracing 3, ailhead 600 is positioned at the top of bracing 3, and slip chute push pedal 60 can be fastened between bracing 3 and ailhead 60.During operation: pinch bracing 3, lower bracing 4, make bracing 3 relative close with an end of lower bracing 4, be connected to rod member 2 slide downward in sleeve pipe on bracing 3, until the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 has coordinated with it get thing; Simultaneously: promote chute push pedal 60 and be fastened between bracing 3 and ailhead 60, keep getting thing state between tapered portion 20 and bulge loop place 10, one hand can complete.
embodiment three:
a kind of root pipe foreign body extractor as shown in Figure 8, the wedge rod member 2 be plugged in sleeve pipe 1 comprise wedge sleeve pipe 1, sliding, the internal face of sleeve pipe 1 bottom has bulge loop 10, the bottom of rod member 2 has tapered portion 20, and the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 coordinates with it and carries out getting thing.
root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in sleeve pipe 1 for operating rod member 2, operating mechanism comprise upper bracing 3, end that an end is connected to rod member 2 upper end be connected to lower bracing 4 on sleeve pipe 1, be connected between bracing 3 and lower bracing 4 for make upper bracing 3 relative with an end of lower bracing 4 near or away from operating parts, operation operating parts drives rod member 2 to slide in sleeve pipe 1.Wherein: the upper end of rod member 2 is connected by screw 0 with between upper bracing 3.
in the present embodiment: upper bracing 3 is bracing in rigidity, and lower bracing 4 is bracing under rigidity, lower bracing 4 is connected with reed seat 70, is connected with flexure strip 71 between the upper surface of reed seat 70 and upper bracing 3.Operating parts comprises turn screw 72, and upper bracing 3 offers screwed hole, and turn screw 72 is threaded with screwed hole, and the end of turn screw 72 is against the upper surface of lower bracing 4.During operation: rotate turn screw 72, upper bracing 3 is moved down on rotary screw 72 by the threaded engagement between turn screw 72, press down flexure strip 71 and drive upper bracing 3 relative close with an end of lower bracing 4, be connected to rod member 2 slide downward in sleeve pipe on bracing 3, until the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 has coordinated with it get thing, one hand can complete.
in addition, the other end of lower bracing 4 is connected with lever 100, the screw rod 101 that can prolong its length direction and slide is equipped with in lever 100, screw rod 101 is provided with by its locking nut 102 of locking relative to lever 100, the length of lever 100 can be adjusted by sliding screw 101, and locked by lock nut 102.
embodiment four:
a kind of root pipe foreign body extractor as shown in Figure 9, the wedge rod member 2 be plugged in sleeve pipe 1 comprise wedge sleeve pipe 1, sliding, the internal face of sleeve pipe 1 bottom has bulge loop 10, the bottom of rod member 2 has tapered portion 20, and the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 coordinates with it and carries out getting thing.
root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in sleeve pipe 1 for operating rod member 2, operating mechanism comprise upper bracing 3, end that an end is connected to rod member 2 upper end be connected to lower bracing 4 on sleeve pipe 1, be connected between bracing 3 and lower bracing 4 for make upper bracing 3 relative with an end of lower bracing 4 near or away from operating parts, operation operating parts drives rod member 2 to slide in sleeve pipe 1.Wherein: the upper end of rod member 2 is connected by screw 0 with between upper bracing 3.
in the present embodiment: upper bracing 3 is bracing in rigidity, and lower bracing 4 is bracing under rigidity, lower bracing 4 is connected with reed seat 70, is connected with flexure strip 71 between the upper surface of reed seat 70 and upper bracing 3.Operating parts comprises positive and negative tooth swing arm 80, revolve and be located at positive tooth nut 81 on positive and negative tooth swing arm 80 and anti-tooth nut 82, the knob 83 be fixed on positive and negative tooth swing arm 80, upper bracing 3, lower bracing 4 are offered porose, positive and negative tooth swing arm 80 is through the hole of upper bracing 3, lower bracing 4, positive tooth nut 81 to revolve on the positive and negative tooth swing arm 80 that is located at and passes hole on bracing 3 and is against on flexure strip 71, anti-tooth nut 82 to revolve on the positive and negative tooth swing arm 80 that is located at and passes hole on lower bracing 4 and is fixed on the lower surface of lower bracing 4, and knob 83 is between upper bracing 3, lower bracing 4.During operation: turn knobs 83, positive and negative tooth swing arm 80 is rotated, drive on positive tooth nut 81 and positive and negative tooth swing arm 80 and rotate, press down flexure strip 71 and drive upper bracing 3 relative close with an end of lower bracing 4, be connected to rod member 2 slide downward in sleeve pipe on bracing 3, until the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 has coordinated with it get thing, one hand can complete.
in addition, the other end of lower bracing 4 is connected with lever 100, the screw rod 101 that can prolong its length direction and slide is equipped with in lever 100, screw rod 101 is provided with by its locking nut 102 of locking relative to lever 100, the length of lever 100 can be adjusted by sliding screw 101, and locked by lock nut 102.
embodiment five:
a kind of root pipe foreign body extractor as shown in Figure 10, the wedge rod member 2 be plugged in sleeve pipe 1 comprise wedge sleeve pipe 1, sliding, the internal face of sleeve pipe 1 bottom has bulge loop 10, the bottom of rod member 2 has tapered portion 20, and the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 coordinates with it and carries out getting thing.
root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in sleeve pipe 1 for operating rod member 2, operating mechanism comprise upper bracing 3, end that an end is connected to rod member 2 upper end be connected to lower bracing 4 on sleeve pipe 1, be connected between bracing 3 and lower bracing 4 for make upper bracing 3 relative with an end of lower bracing 4 near or away from operating parts, operation operating parts drives rod member 2 to slide in sleeve pipe 1.Wherein: the upper end of rod member 2 is connected by screw 0 with between upper bracing 3.
in the present embodiment: upper bracing 3 be bracing in rigidity, and lower bracing 4 be bracing under rigidity, and the other end of upper bracing 3, lower bracing 4 is connected by elastic ring 90, by elastic ring 90 to make between upper bracing 3, lower bracing 4 can close or away from elasticity change.Operating parts comprises positive and negative tooth swing arm 80, revolve and be located at positive tooth nut 81 on positive and negative tooth swing arm 80 and anti-tooth nut 82, the knob 83 be fixed on positive and negative tooth swing arm 80, upper bracing 3, lower bracing 4 are offered porose, positive and negative tooth swing arm 80 is through the hole of lower bracing 3, lower bracing 4, positive tooth nut 81 to revolve on the positive and negative tooth swing arm 80 that is located at and passes hole on bracing 3 and is against on the upper surface of bracing 3, anti-tooth nut 82 to revolve on the positive and negative tooth swing arm 80 that is located at and passes hole on lower bracing 4 and is fixed on the lower surface of lower bracing 4, and knob 83 is between upper bracing 3, lower bracing 4.During operation: turn knobs 83, positive and negative tooth swing arm 80 is rotated, positive tooth nut 81 is driven to rotate on positive and negative tooth swing arm 80, press down flexure strip 71 and drive and upper bracing 3 relative close with an end of lower bracing 4, be connected to rod member 2 slide downward in sleeve pipe on bracing 3, until the bulge loop place 10 that the tapered portion 20 of rod member 2 slides into sleeve pipe 1 has coordinated with it get thing, one hand can complete.
above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1. a root pipe foreign body extractor, comprise sleeve pipe, the rod member be plugged in described sleeve pipe slided, the internal face of described casing part has bulge loop, the bottom of described rod member has tapered portion, the bulge loop place that the tapered portion of described rod member slides into described sleeve pipe coordinates with it and carries out getting thing, it is characterized in that: described root pipe foreign body extractor also comprises the operating mechanism carrying out sliding in described sleeve pipe for operating described rod member, described operating mechanism comprises the upper bracing that an end is connected to described rod member upper end, one end is connected to the lower bracing on described sleeve pipe, be connected between described upper bracing and lower bracing for make described upper bracing relative with an end of lower bracing near or away from operating parts, rod member described in operating parts described in operation drives slides in described sleeve pipe.
2. a kind of root pipe foreign body extractor according to claim 1, is characterized in that: described upper bracing is bracing in elasticity, and described lower bracing is bracing under elasticity, and described upper bracing, the other end of lower bracing are connected.
3. a kind of root pipe foreign body extractor according to claim 2, it is characterized in that: described operating parts comprises lever post in inverted T shape and pressing plate, the end of described lever post has hook part, described pressing plate comprises a bending part, described upper bracing, lower bracing are offered porose, described lever post is successively through the hole of described lower bracing, upper bracing, and the hook part of described lever post is through the hole of described upper bracing, and an end of described pressing plate is fastened between the hook part of described upper bracing and described lever post.
4. a kind of root pipe foreign body extractor according to claim 2, it is characterized in that: described operating parts comprises the chute push pedal being arranged on described upper bracing upper surface that an end is fixed on pin on described lower bracing, slip, the other end of described pin has ailhead, described upper bracing is offered porose, described pin is through the hole of described upper bracing, described ailhead is positioned at the top of described upper bracing, and the chute push pedal described in slip can be fastened between described upper bracing and described ailhead.
5. a kind of root pipe foreign body extractor according to claim 1, it is characterized in that: described upper bracing is bracing in rigidity, described lower bracing is bracing under rigidity, and described lower bracing is connected with reed seat, is connected with flexure strip between described reed seat and the upper surface of upper bracing.
6. a kind of root pipe foreign body extractor according to claim 5, it is characterized in that: described operating parts comprises turn screw, described upper bracing offers screwed hole, described turn screw is threaded with described screwed hole, and the end of described turn screw is against described lower bracing upper surface.
7. a kind of root pipe foreign body extractor according to claim 5, it is characterized in that: described operating parts comprises positive and negative tooth swing arm, revolve and be located at positive tooth nut on described positive and negative tooth swing arm and anti-tooth nut, be fixed on the knob on described positive and negative tooth swing arm, described upper bracing, lower bracing is offered porose, described positive and negative tooth swing arm is through described upper bracing, the hole of lower bracing, described positive tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described upper bracing and is against on described flexure strip, described anti-tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described lower bracing and is fixed on the lower surface of described lower bracing.
8. a kind of root pipe foreign body extractor according to claim 5 or 6 or 7, it is characterized in that: the other end of described lower bracing is connected with lever, be equipped with the screw rod that can prolong its length direction and slide in described lever, described screw rod be provided with by its locking nut of locking relative to lever.
9. a kind of root pipe foreign body extractor according to claim 1, it is characterized in that: described described upper bracing is bracing in rigidity, described lower bracing is bracing under rigidity, and described upper bracing, the other end of lower bracing are connected by elastic ring.
10. a kind of root pipe foreign body extractor according to claim 9, it is characterized in that: described operating parts comprises positive and negative tooth swing arm, revolve and be located at positive tooth nut on described positive and negative tooth swing arm and anti-tooth nut, be fixed on the knob on described positive and negative tooth swing arm, described upper bracing, lower bracing is offered porose, described positive and negative tooth swing arm is through described lower bracing, the hole of lower bracing, described positive tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described upper bracing and is against on the upper surface of described upper bracing, described anti-tooth nut to revolve on the positive and negative tooth swing arm that is located at and passes hole on described lower bracing on the lower surface being fixed on described lower bracing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073904.1A CN104665940B (en) | 2015-02-12 | 2015-02-12 | A kind of root pipe foreign body extractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073904.1A CN104665940B (en) | 2015-02-12 | 2015-02-12 | A kind of root pipe foreign body extractor |
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| Publication Number | Publication Date |
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| CN104665940A true CN104665940A (en) | 2015-06-03 |
| CN104665940B CN104665940B (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510073904.1A Active CN104665940B (en) | 2015-02-12 | 2015-02-12 | A kind of root pipe foreign body extractor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105167866A (en) * | 2015-08-28 | 2015-12-23 | 成都普瑞幂尔医疗咨询有限公司 | Combined interacanal fractured instrument extracting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105167866A (en) * | 2015-08-28 | 2015-12-23 | 成都普瑞幂尔医疗咨询有限公司 | Combined interacanal fractured instrument extracting device |
| CN105167866B (en) * | 2015-08-28 | 2017-10-17 | 成都普瑞幂尔医疗咨询有限公司 | Fracture apparatus withdrawing device in a kind of combined type root pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104665940B (en) | 2017-04-05 |
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