CN207370918U - Pressure release is followed closely in bone - Google Patents
Pressure release is followed closely in bone Download PDFInfo
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- CN207370918U CN207370918U CN201720253739.2U CN201720253739U CN207370918U CN 207370918 U CN207370918 U CN 207370918U CN 201720253739 U CN201720253739 U CN 201720253739U CN 207370918 U CN207370918 U CN 207370918U
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Abstract
The utility model belongs to medical instruments field, and specifically disclosing one kind can not only enter to avoid foreign matter, but also beneficial to pressure release is followed closely in the bone of cleaning in bone.Pressure release is followed closely in bone, and the nail rod including being internally provided with middle cavity further includes the head of a nail being rotatably arranged on nail rod one end；Pressure release portion is provided on the head of a nail, middle cavity is in communication with the outside by pressure release portion；Nail rod rod segment in the head of a nail is equipped with cleaning and is open, and cleaning opening is communicated with middle cavity, and the side wall of the head of a nail is equipped with opening and closing and is open, and opening and closing opening can turn to the state with cleaning opening in communication with the head of a nail.By the way that the head of a nail of the end set in nail rod with pressure release portion can nail rod be blocked in the process on the feed to avoid the patient in treatment, the patency of pressure release ensure that；When needing to being cleaned in bone, the head of a nail is turned into opening and closing opening and the position of cleaning opening in communication, you can cleaning solution is added in middle cavity by cleaning opening and is cleaned, improves the therapeutic effect of core decompression art.
Description
Technical field
The utility model belongs to medical instruments field, and in particular to pressure release is followed closely in a kind of bone.
Background technology
Cyst of jaw refers to occur the Cystic lesions containing liquid in jawbone, incrementally increases, jawbone expansion damage.Mesh
Before, intraosseous pressure excretion is generally carried out by root pipe or pressure release nail for the treatment of cyst of jaw.Existing pressure release screw includes nail
Bar, the both ends open of nail rod, inside are cavity, and the side wall of nail rod is equipped with the through hole communicated with the internal cavities of nail rod.Due to
The both ends open of nail rod, patient in treatment on the feed during, the tail end opening of nail rod is often blocked by food, is both unfavorable for
The pressure in bone is released, and be easy to cause infection, seriously affects the effect for the treatment of.
Utility model content
The technical problem to be solved by the present invention is to provide one kind can not only enter to avoid foreign matter, but also beneficial to cleaning in bone
Bone in pressure release nail.
Technical solution is used by the utility model solves its technical problem：Pressure release is followed closely in bone, in being internally provided with
Between cavity nail rod, further include the head of a nail being rotatably arranged on nail rod one end；Pressure release portion is provided on the head of a nail, it is described
Middle cavity is in communication with the outside by pressure release portion；Nail rod rod segment in the head of a nail is equipped with cleaning and is open, the cleaning opening with
Middle cavity communicates, and the side wall of the head of a nail is equipped with opening and closing and is open, and the opening and closing opening can be turned to the head of a nail to be opened with cleaning
The state that mouth is connected.
It is further that the pressure release portion includes the relief hole being arranged on the head of a nail.
Further that the relief hole is arranged on the top of the head of a nail, the both ends of relief hole be located at respectively at the top of the head of a nail it is interior,
On outer surface, the pressure release portion further includes the filter layer on the outer surface being arranged at the top of the head of a nail.
It is further that the pressure release portion is arranged on the top of the head of a nail, which is bonded to each other by least two upper ends
Concave arc shape limb form.
Further that the pressure release portion is arranged on the top of the head of a nail, the pressure release portion be spherical cambered surface closed end, the ball arc
Face closed end is made of at least three convex limbs.
It is further that the pressure release portion is arranged on the top of the head of a nail, which is included with lower part inlet end and upper
The valve chamber of portion outlet side and along the spool and spring in the valve chamber that is successively set on of flow direction of air-flow；The roof of the valve chamber
Spring slot is equipped with, one end of the spring props up spool, and another section of spring is against on spring slot.
It is further that the pressure release portion is arranged on the top of the head of a nail, which is included with lower end air inlet and upper
It brings out the cavity of gas port and the elastic valve plate closed in the cavity and by lower end air inlet is set, when in middle cavity
When pressure is more than external atmosphere pressure, the free end of elastic valve plate can be moved towards upper end gas outlet by lower end air inlet open.
It is further that valve block fixed column, the feather valve are provided on the cavity bottom wall of lower end air inlet one side
One end of piece is fixed in valve block fixed column, and the other end of elastic valve plate is fitted in the cavity bottom of lower end air inlet opposite side
On wall.
It is further that the lower end of the head of a nail is provided with the first snatch and the second snatch, is set on the side wall of the nail rod
Be equipped with respectively with the first snatch and corresponding first head of the second snatch and the second head, first head and the first snatch
Match and can be embedded, second head matches with the second snatch and can be embedded；When the head of a nail is turned to
When one head is embedded in the first snatch, opening and closing opening is not communicated with cleaning opening；Second is embedded in when the head of a nail is turned to the second head
During snatch, opening and closing opening and cleaning opening in communication.
It is further that the lateral wall of the nail rod on the upside of the first head and the second head is equipped with the protrusion knot of annular
Structure, the inner wall of the head of a nail are equipped with the sunk structure to match with bulge-structure；In the bulge-structure insertion sunk structure
Nail rod and the head of a nail is made to link together and can relatively rotate.
The beneficial effects of the utility model are：There is the head of a nail in pressure release portion by the end set in nail rod, it can be to avoid
Patient in treatment causes nail rod to be blocked in the process on the feed, ensure that the patency of pressure release；By set cleaning opening and
Can with clean opening in communication opening and closing opening, when needing to being cleaned in bone, by the head of a nail turn to opening and closing opening with
Clean the position of opening in communication, you can cleaned by cleaning opening to middle cavity addition cleaning solution, improve marrow core
The therapeutic effect of decompression.
Description of the drawings
Fig. 1 is the implementation structure diagram of the first embodiment of the utility model；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the implementation structure diagram of second of embodiment of the utility model；
Fig. 4 be the utility model second of embodiment in the first head be embedded in the first snatch when implementation structural representation
Figure；
Fig. 5 is the left view of Fig. 4；
Fig. 6 is the implementation structure diagram of the third embodiment of the utility model；
Fig. 7 is the implementation structure diagram of the 4th kind of embodiment of the utility model；
Fig. 8 is the implementation structure diagram of the 5th kind of embodiment of the utility model；
Fig. 9 is the implementation structure diagram of the 6th kind of embodiment of the utility model；
Figure 10 is the implementation structure diagram of the 7th kind of embodiment of the utility model；
Figure 11 be the utility model second to the 7th kind of embodiment in nail rod implementation structure diagram；
Figure 12 is the top view of Figure 11；
In figure mark for：It is nail rod 100, middle cavity 110, the 120, first head 130 of cleaning opening, the second head 140, convex
Play structure 150, the head of a nail 200, opening and closing opening 210, relief hole 221, filter layer 222, concave arc shape limb 231, convex limb
241st, valve chamber 251, lower part inlet end 252, top outlet side 253, spool 254, spring 255, spring slot 256, O-ring seal
257th, cavity 261, lower end air inlet 262, upper end gas outlet 263, elastic valve plate 264, valve block fixed column 265, the first snatch
270th, the second snatch 280, sunk structure 290, mat 300.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Fig. 1, Fig. 3, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10, pressure release nail in bone, including being internally provided with middle cavity
110 nail rod 100 and the head of a nail 200 being rotatably arranged on 100 one end of nail rod；Pressure release portion is provided on the head of a nail 200,
Middle cavity 110 is in communication with the outside by pressure release portion；100 rod segment of nail rod in the head of a nail 200 is equipped with cleaning opening 120, clearly
It washes opening 120 to communicate with middle cavity 110, the side wall of the head of a nail 200 is equipped with opening and closing opening 210, and opening and closing opening 210 can be with the head of a nail
200 turn to the state being connected with cleaning opening 120.Wherein, external screw thread is typically provided in nail rod 100, to be installed
Enter in bone and treated；Nail rod 100 can be that the knot of through hole is carried on the tubular structure of both ends open or side wall
Structure can also be that side wall carries the tubular structure of multiple through holes；In order to be beneficial to pressure release in bone, generally on the side wall of nail rod 100
Equipped with multiple equally distributed through holes, each through hole is connected respectively with middle cavity 110.The head of a nail 200 generally comprises calotte and sets
Put the flange in calotte lower end；The head of a nail 200 is installed by flange, flange is usually regular hexagon structure, in order to follow closely
Cap 200 screws installation；After nail rod 100 is implanted into bone, the head of a nail 200 is used to be sealed in the exposed junction of nail rod 100, can avoid controlling
Patient in treatment causes the middle cavity 110 inside nail rod 100 to be blocked in the process on the feed；Pressure release is provided on the head of a nail 200
Portion can make pressure release in bone unobstructed, beneficial to guarantee therapeutic effect.Rotatable set-up mode of the head of a nail 200 on 100 one end of nail rod
Can be a variety of, such as threaded connection is set, clearance fit is set or bearing connection is set etc.；Need in bone into
During row cleaning, by rotating the head of a nail 200 to cleaning opening 120 and 210 positions that are connected of opening and closing opening, you can opened by cleaning
Mouth 120 adds in cleaning solution to middle cavity 110 and is cleaned, and improves the therapeutic effect to patient.
In order to avoid pressure release nail is implanted into patient bone 200 unintentional rotation of the head of a nail afterwards and in order to avoid carrying out in the bone
200 unintentional rotation of the head of a nail in cleaning process in bone, pressure release, which nails on, in the bone is additionally provided with fixed structure.The fixed structure includes
Two kinds of stationary states to the head of a nail 200, a kind of is stationary state when cleaning opening 120 is connected with opening and closing opening 210, a kind of
It is stationary state when cleaning opening 120 is not connected with opening and closing opening 210；The embodiment of above-mentioned fixed structure can be more
Kind, it is preferably the structure shown in Fig. 3~12, i.e. the lower end of the head of a nail 200 is provided with the first snatch 270 and the second snatch 280, nail rod
Be provided on 100 side wall respectively with 280 corresponding first head, 130 and second head of the first snatch 270 and the second snatch
140, the first head 130 matches and can be embedded with the first snatch 270, and the second head 140 matches with the second snatch 280
And it can be embedded；When the head of a nail 200 being turned to the first head 130 being embedded in the first snatch 270, opening and closing opening 210 and cleaning
Opening 120 is not communicated with, as shown in Fig. 6~10；When the head of a nail 200 being turned to the second head 140 being embedded in the second snatch 280, open
Make and break mouth 210 is connected with cleaning opening 120, as shown in Figure 3.Generally, using 100 axis of nail rod as standard, the first snatch 270
And the second radian between snatch 280 is less than the radian between the first head 130 and the second head 140.
Specifically, as shown in Figure 4 and Figure 5, the embedded division that can be embedded in the first head 130 is provided in the first snatch 270, and
In first snatch 270 its with the first head 130 compared with side be equipped with communicated with foregoing embedded division enter notch；It screws
The head of a nail 200 makes the first snatch 270 be moved towards the first head 130, and the first head 130 can be by being embedded in first into notch
In embedded division in snatch 270.
Similarly, be provided with the embedded division that can be embedded in the second head 140 in the second snatch 280, and in the second snatch 280
Its with the second head 140 compared with side be equipped with communicated with foregoing embedded division enter notch；The head of a nail 200 is screwed, makes second
Snatch 280 is moved towards the second head 140, the insertion that the second head 140 can be embedded in by entering notch in the second snatch 280
In portion.
Wherein, it is located at mutual distance farther out into notch on notch and the second snatch 280 in the first snatch 270
One side, the first snatch 270 and the second snatch 280 be made of the stronger material of elastic deformability, such as：Rubber.
Preferably, as shown in Fig. 3 and Fig. 6~12, outside the nail rod 100 of 140 upside of the first head 130 and the second head
Side wall is equipped with the bulge-structure 150 of annular, and the inner wall of the head of a nail 200 is equipped with the sunk structure to match with bulge-structure 150
290；Bulge-structure 150, which is embedded in sunk structure 290, makes nail rod 100 and the head of a nail 200 link together and can relatively rotate.It is above-mentioned
The structure that is rotatably connected not only be beneficial to the connection of nail rod 100 and the head of a nail 200, but also convenient disassembly.
Specifically, again as shown in Figure 1, pressure release portion includes the relief hole 221 being arranged on the head of a nail 200.In order to be beneficial to pressure release, lead to
Relief hole 221 is often arranged on to the top of the head of a nail 200, and the both ends of relief hole 221 is made to be located at the inside and outside of 200 top of the head of a nail respectively
On surface.Relief hole 221 usually set it is multiple, distribution mode of multiple relief holes 221 on the head of a nail 200 can be it is a variety of, it is excellent
Elect the distribution mode such as Fig. 2 as, i.e., multiple relief holes 221 are uniformly distributed in the surface of middle cavity 110.
On the basis of the above, in order to avoid fine grained enters from relief hole 221 in the middle cavity 110 of nail rod 100, such as scheme
Shown in 3, pressure release portion further includes the filter layer 222 being arranged on the outer surface at 200 top of the head of a nail.Filter layer 222 can be by filtering
Cloth, dense micro-hole material etc. are made.
As a kind of preferred embodiment of the utility model, as shown in fig. 6, pressure release portion is arranged on the top of the head of a nail 200, this is let out
The concave arc shape limb 231 that splenium is bonded to each other by least two upper ends is formed.When the pressure in middle cavity 110 is more than the external world greatly
During air pressure, 231 place of fitting of concave arc shape limb is opened, and intraosseous pressure is released；When the pressure in middle cavity 110 is less than or equal to
During external atmosphere pressure, concave arc shape limb 231 is in the state being bonded to each other, and forms the Anti-backflow structure similar to venous valve, i.e.,
Can middle cavity 110 can be prevented liquid entry into conducting fluid to avoid entrance such as foods.
On the basis of the above, in order to protect concave arc shape limb 231, and also to the oral cavity of patient be protected, such as Fig. 7 institutes
Show, pressure release nail further includes the mat 300 for being arranged on 200 top of the head of a nail in the bone.Mat 300 is used for concave arc shape valve
The pressure release portion that piece 231 is formed covers, and usually has Web materials to be made.
As another preferred embodiment of the utility model, as shown in figure 8, pressure release portion is arranged on the top of the head of a nail 200, it should
Pressure release portion is spherical cambered surface closed end, and spherical cambered surface closed end is made of at least three convex limbs 241.When in middle cavity 110
Pressure be more than external atmosphere pressure when, form spherical cambered surface closed end convex limb 241 be flared out, intraosseous pressure is let out
Go out；When the pressure in middle cavity 110 is less than or equal to external atmosphere pressure, spherical cambered surface closed end is in closure state, you can with
The entrance such as food are avoided, can middle cavity 110 be prevented liquid entry into conducting fluid.Generally also in spherical cambered surface closed end knot
Mat 300 is provide with outside the pressure release portion of structure to be protected.
As another preferred embodiment of the utility model, as shown in figure 9, pressure release portion is arranged on the top of the head of a nail 200, it should
Pressure release portion includes the valve chamber 251 with lower part inlet end 252 and top outlet side 253 and is set gradually along the flow direction of air-flow
Valve chamber 251 in spool 254 and spring 255；The roof of valve chamber 251 is equipped with spring slot 256, one end of spring 255
Spool 254 is propped up, another section of spring 255 is against on spring slot 256.
Wherein, the top of the head of a nail 200 is mainly made of upper and lower two parts, by super after parts install valve chamber 251
The modes such as sound wave welding are fixed together；Valve chamber 251 is set in the top of the head of a nail 200, the top of valve chamber 251 be with it is outer
The top outlet side 253 that boundary communicates, the lower part of valve chamber 251 are the lower part inlet end 252 communicated with middle cavity 110；Spool 254
Generally use plastics are made, and are preferably PP plastics；Under normal conditions, spring 255 props up spool 254, makes spool 254 with surrounding
The bottom wall of valve chamber 251 contacts to form sealing.When the pressure in middle cavity 110 is less than or equal to external atmosphere pressure, spool
254 contact with surrounding the bottom wall of valve chamber 251, and food etc. is avoided to enter middle cavity 110；Pressure in middle cavity 110
When power is more than external atmosphere pressure, the pressure that spool 254 is subject to is more than the elastic force of spring 255, and the retrogressing of spool 254 makes lower part inlet end
252 open, and the pressure in middle cavity 110 is released.The flow direction of air-flow refers to that the pressure in middle cavity 110 is let out from pressure release portion
The direction in direction, i.e. lower part inlet end 252 to top outlet side 253 that gas flows when going out.
Specifically, again as shown in figure 9, spool 254 includes valve core rod and is arranged on the taper chock plug of spool boom end, spring
255 are arranged on valve core rod and between taper chock plug and spring slot 256；Pressure release portion further includes O-ring seal 257；Cone
Conical seal (contact) face, cylinder and annular flat table top are equipped with successively along the flow direction of air-flow on shape chock plug, and O-ring seal 257 is arranged on column
Between face and annular flat table top.The taper to match with conical seal (contact) face is typically provided in the bottom wall for surrounding valve chamber 251
Face, spool 254 contacts forming face sealing with surrounding the bottom wall of valve chamber 251 under the action of spring 255.In spring 255
Under elastic force effect, O-ring seal 257 forms secondary seal, further improves with being against in the bottom wall for surrounding valve chamber 251
Sealing effect.
As another preferred embodiment of the utility model, as shown in Figure 10, pressure release portion is arranged on the top of the head of a nail 200,
The pressure release portion includes the cavity 261 with lower end air inlet 262 and upper end gas outlet 263 and is arranged in cavity 261 and incites somebody to action
The elastic valve plate 264 that lower end air inlet 262 closes, when the pressure in middle cavity 110 is more than external atmosphere pressure, feather valve
The free end of piece 264 can move towards upper end gas outlet 263 and open lower end air inlet 262.
Wherein, the top of cavity 261 is the upper end gas outlet 263 communicated with the external world, and the lower part of cavity 261 is empty with centre
The lower end air inlet 262 that chamber 110 communicates；General upper end gas outlet 263 is made of multiple equally distributed through holes；Elastic valve plate
264 are usually made of elastic material, it is preferred to use silica gel material makes.
Specifically, again as shown in Figure 10, on 261 bottom wall of cavity of 262 one side of lower end air inlet being provided with valve block consolidates
Fixed column 265, one end of elastic valve plate 264 are fixed in valve block fixed column 242, and the other end of elastic valve plate 241 is fitted in
On 261 bottom wall of cavity of 262 opposite side of lower end air inlet.The other end of elastic valve plate 241 is the freedom of elastic valve plate 241
End.
Claims (10)
1. pressure release is followed closely in bone, the nail rod (100) including being internally provided with middle cavity (110), it is characterised in that：It further includes rotatable
Ground is arranged on the head of a nail (200) on nail rod (100) one end；Pressure release portion is provided on the head of a nail (200), the pressure release portion is by
Between cavity (110) be in communication with the outside；Nail rod (100) rod segment in the head of a nail (200) is equipped with cleaning opening (120), described
Cleaning opening (120) is communicated with middle cavity (110), and the side wall of the head of a nail (200) is equipped with opening and closing opening (210), described
Opening and closing opening (210) can turn to the state being connected with cleaning opening (120) with the head of a nail (200).
2. pressure release is followed closely in bone as described in claim 1, it is characterised in that：The pressure release portion includes being arranged on the head of a nail (200)
Relief hole (221).
3. pressure release is followed closely in bone as claimed in claim 2, it is characterised in that：The relief hole (221) is arranged on the top of the head of a nail (200)
Portion, the both ends of relief hole (221) are located at respectively in the inner and outer surfaces at the top of the head of a nail (200), and the pressure release portion, which further includes, to be arranged on
Filter layer (222) on outer surface at the top of the head of a nail (200).
4. pressure release is followed closely in bone as described in claim 1, it is characterised in that：The pressure release portion is arranged on the top of the head of a nail (200),
The concave arc shape limb (231) that the pressure release portion is bonded to each other by least two upper ends is formed.
5. pressure release is followed closely in bone as described in claim 1, it is characterised in that：The pressure release portion is arranged on the top of the head of a nail (200),
The pressure release portion is spherical cambered surface closed end, and the spherical cambered surface closed end is made of at least three convex limbs (241).
6. pressure release is followed closely in bone as described in claim 1, it is characterised in that：The pressure release portion is arranged on the top of the head of a nail (200),
The pressure release portion includes the valve chamber (251) with lower part inlet end (252) and top outlet side (253) and the flow direction along air-flow
The spool (254) and spring (255) in valve chamber (251) being successively set on；The roof of the valve chamber (251) is equipped with spring groove
Hole (256), one end of the spring (255) prop up spool (254), and another section of spring (255) is against spring slot (256)
On.
7. pressure release is followed closely in bone as described in claim 1, it is characterised in that：The pressure release portion is arranged on the top of the head of a nail (200),
The pressure release portion includes the cavity (261) with lower end air inlet (262) and upper end gas outlet (263) and is arranged on cavity
(261) elastic valve plate (264) in and closed lower end air inlet (262), outside the pressure in middle cavity (110) is more than
During boundary's atmospheric pressure, the free end of elastic valve plate (264) can be moved towards upper end gas outlet (263) beats lower end air inlet (262)
It opens.
8. pressure release is followed closely in bone as claimed in claim 7, it is characterised in that：Cavity positioned at lower end air inlet (262) one side
(261) valve block fixed column (265) is provided on bottom wall, one end of the elastic valve plate (264) is fixed at valve block fixed column
(265) on, the other end of elastic valve plate (264) is fitted on cavity (261) bottom wall of lower end air inlet (262) opposite side.
9. pressure release is followed closely in the bone as described in claim 1,2,3,4,5,6,7 or 8, it is characterised in that：Under the head of a nail (200)
End is provided with the first snatch (270) and the second snatch (280), is provided on the side wall of the nail rod (100) and is grabbed respectively with first
Detain (270) and corresponding first head (130) of the second snatch (280) and the second head (140), first head (130)
Match and can be embedded with the first snatch (270), second head (140) matches with the second snatch (280) and can
It is embedded；When the head of a nail (200) is turned to embedded first snatch (270) of the first head (130), opening and closing opening (210) with
Cleaning opening (120) is not communicated with；When the head of a nail (200) is turned to the second head (140) insertion the second snatch (280), opening and closing
Opening (210) is connected with cleaning opening (120).
10. pressure release is followed closely in bone as claimed in claim 9, it is characterised in that：Positioned at the first head (130) and the second head
(140) nail rod (100) lateral wall on the upside of is equipped with the bulge-structure (150) of annular, and the inner wall of the head of a nail (200) is equipped with
The sunk structure (290) to match with bulge-structure (150)；Make nail in the embedded sunk structure (290) of the bulge-structure (150)
Bar (100) and the head of a nail (200) link together and can relatively rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253739.2U CN207370918U (en) | 2017-03-15 | 2017-03-15 | Pressure release is followed closely in bone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253739.2U CN207370918U (en) | 2017-03-15 | 2017-03-15 | Pressure release is followed closely in bone |
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| Publication Number | Publication Date |
|---|---|
| CN207370918U true CN207370918U (en) | 2018-05-18 |
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ID=62297269
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720253739.2U Active CN207370918U (en) | 2017-03-15 | 2017-03-15 | Pressure release is followed closely in bone |
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| CN (1) | CN207370918U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106730072A (en) * | 2017-03-15 | 2017-05-31 | 四川大学 | Pressure release nail in bone |
| CN109875638A (en) * | 2019-03-06 | 2019-06-14 | 何志友 | A kind of medical medullary cavity internal jugular vein reflux unit |
-
2017
- 2017-03-15 CN CN201720253739.2U patent/CN207370918U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106730072A (en) * | 2017-03-15 | 2017-05-31 | 四川大学 | Pressure release nail in bone |
| CN106730072B (en) * | 2017-03-15 | 2023-08-11 | 四川大学 | Pressure relief nail in bone |
| CN109875638A (en) * | 2019-03-06 | 2019-06-14 | 何志友 | A kind of medical medullary cavity internal jugular vein reflux unit |
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