CN107115143B - A kind of PVP absorbable stent and its molding method - Google Patents
A kind of PVP absorbable stent and its molding method Download PDFInfo
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- CN107115143B CN107115143B CN201710511738.8A CN201710511738A CN107115143B CN 107115143 B CN107115143 B CN 107115143B CN 201710511738 A CN201710511738 A CN 201710511738A CN 107115143 B CN107115143 B CN 107115143B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/885—Tools for expanding or compacting bones or discs or cavities therein
- A61B17/8852—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc
- A61B17/8855—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc inflatable, e.g. kyphoplasty balloons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/885—Tools for expanding or compacting bones or discs or cavities therein
- A61B17/8852—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc
- A61B17/8858—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc laterally or radially expansible
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B2017/00526—Methods of manufacturing
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Abstract
The invention discloses a kind of PVP bioabsorbable stents, comprising: expander, expander include sequentially connected Y-connection, straight tube and sacculus；Casing, casing includes fixed baffle, active blade and a pair of of adjustment structure, active blade and a pair of of adjustment structure are arranged on casing, and adjustment structure control active blade moves reciprocatingly, wherein, adjustment structure includes drawstring, winding drum and several rubbing devices, and active blade is connected on a pair of of winding drum by drawstring avoids winding drum in the moment stopped rotating since effect of inertia continues to rotate；Auxiliary device, auxiliary device include the developing ring in sacculus；The open end of net grid support, net grid support is movably set on straight tube, and sacculus is located in the hollow cavity of net grid support.The present invention can be accurately adjusted balloon expandable direction, avoid the fracture site refracture for not having to be softened.
Description
Technical field
The present invention relates to the field of medical instrument technology, and in particular to a kind of PVP bioabsorbable stent and its forming method.
Background technique
Percutaneous vertbroplasty (percutaneous vertebroplasty, PVP) refers to percutaneously through pedicle of vertebral arch or vertebra
Injection bone cement increases centrum strength and stability to reach in nut extroversion centrum, prevents from collapsing, and relieves pain or even part
A kind of minimally invasive spinal surgery technology for the purpose of recovery vertebral height.
Vertebroplasty as a kind of open surgery be used for enhance pedicle screw and fill tumor resection after leave lack
Damage the history of existing decades.The operation is that bone tissue or bone cement injection centrum are enhanced its structural strength from mechanics.It is right
In certain cases, since the risk of open surgery is too big, and halt doctor and patient, therefore percutaneous vertbroplasty occur
(PVP).Percutaneous vertbroplasty inherit the advantages of vertebroplasty and without complication related with open surgery.This operation
Carried out first in French Amiens University Hospital dept. of radiology by Galibert and Deramond within 1984, percutaneous injection bone cement first
Base methyl acrylate (polymethyl-methacrylate PMMA) has successfully treated 1 neck, 2 Vertebral Hemangioma patient, opens
The beginning of percutaneous vertbroplasty is created.The neuroradiological section of Lyons, France affiliated hospital, university and neurosurgeon use one
The technology (18G) that kind improves slightly is to 7 patient's vertebra internal injection bone cements, wherein 2 are Vertebral Hemangioma
(vertebralhemangiomas VHs), 1 is Spinal Metastases, and 4 patients have osteoporotic vertebral compressibility
Fracture.As a result the pain relief of 7 patients, good 1, excellent 6.The reports such as Kaemmerlen in 1989 treat vertebra using the technology
Body metastatic tumor has 16 acquirement significant curative effects in 20 Metastatic Tumor of Vertebral Body, and 2 invalid, has 2 complication, author occur
Think, painful osteolytic Vertebral Metastases are that the optimal operation of percutaneous vertbroplasty adapts to without invading around pedicle of vertebral arch
One of card.
1994 PVP (using the method for Deramond) taken the lead in making referrals to the U.S. by University of Virginia.From then on,
PVP becomes a kind of common method for treating painful centrum disease.The application of percutaneous vertbroplasty is gradually promoted, in addition to vertebra
Hemangioma, myeloma outside ostelytic metastases tumor, are more applied to Osteoporotic Vertebral Compression Fractures with intractable pain
Patient.As the life span of metastases patient extends, they can be movable in the final stage of quality of life and disease
It is required that also increasing accordingly.In spinal metastasis patient, it was reported that PVP can be relieved pain and is structurally reinforced by bone resorption
The centrum of destruction, so that the pain of patient mitigates and can continue to daily weight-bearing activities.European experience is mainly concentrated
Pain (including benign and malignant) related with tumour is being treated, and American experience is concentrated mainly on treatment and osteoporosis
The property related pain of compression fracture.
Percutaneous kyplasty (percutaneous kyphoplasty, PKP) is changing for percutaneous vertbroplasty
Good and development, U.S. Berkeley orthopedist MarkReiley in 1999 develop a kind of expansiveness expansion bone sacculus
(KyphXTM, InflatableBone Tamp), the technology answer centrum using the method for air bag expansion in percutaneous puncture centrum
Position, forms space inside centrum, required thrust when can reduce injection bone cement in this way, and bone cement is disposed within is not easy
Flowing.This mode is compared with usual manner, the two bio-mechanical property indistinction, clinical application show it not only and can release or
Symptom is relieved pain, can also obviously restore the stiffness and strength for being increased centrum by the height of compressed vertebral, make the physiology of backbone
Curvature is restored, and can increase the volume of splanchnocoel and improve organ function, improves the quality of life of patient.U.S. Kyphon
The expansiveness of company's development and production expands bone sacculus (KyphXTM) somewhat expensive, and domestic Guan Long company production is improved inflatable
Property expand bone sacculus have been used for clinic, expense substantially reduces, and is conducive to promote and apply.What Disc-O-Tech company, Israel developed
A kind of novel kyphoplasty Xi Tong &mdash；Sky expansion type vertebral forming system (Sky Bone Expender
System) also started to be applied to clinic.In addition, four pieces of metal foils of use that A-spine company develops make corpus vertebrae replacement simultaneously
One rear convex plasty for stablizing the Sunflower system in cavity is provided simultaneously, also can control the shape and volume in cavity
And it can be by cystic container (Vessel-X®；) indwelling also will in the Vesselplasty technology etc. for filling bone cement in centrum
Applied to clinic.
Percutaneous vertbroplasty and Balloon kyphoplasty are carried out extensively in worldwide.2002,
The percutaneous vertbroplasty that the U.S. carries out just has 38000, and percutaneous rear convex plasty has 16000, is mainly used for osteoporosis
The treatment of property vertebral compression fracture, the pain relief rate of report is more than 90%, and it is few severe complication occur, their good treatments
Effect and higher safety have obtained the approval of numerous doctors and patient.
Therefore it is badly in need of a kind of new conduit, can be accurately adjusted balloon expandable direction, solve this clinical problem.Make sacculus to
Preset distraction reduction direction expansion, the centrum collapsed is gradually propped up up to being restored to clinical treatment requirement, and shape
At a cavity for filling to insert bone filler, avoids the fracture and injury degree for aggravating broken position and cause bone again
The PVP bioabsorbable stent of folding and the forming method of PVP bioabsorbable stent.
Summary of the invention
In view of this, the present invention provide it is a kind of can be accurately adjusted balloon expandable direction, the centrum that will be collapsed gradually is propped up
Until being restored to clinical treatment requirement, and a cavity for filling is formed to insert bone filler, avoid aggravating broken
The fracture and injury degree at broken position and cause the PVP bioabsorbable stent of refracture and the forming method of PVP bioabsorbable stent.
To achieve the above object, the invention provides the following technical scheme:
A kind of PVP bioabsorbable stent, comprising:
Expander, the expander include sequentially connected Y-connection, straight tube and sacculus；
Casing, described sleeve pipe include fixed baffle, a pair of of active blade and a pair of of adjustment structure, a pair of of active blade and one
Adjustment structure is arranged in described sleeve pipe, and the adjustment structure controls a pair of of active blade and does opposite or reverse motions,
Wherein, the adjustment structure includes a pair of of the winding drum and several rubbing devices of a pair of of drawstring, coaxial arrangement, a pair of of active catch
Piece is connected on a pair of of winding drum by a pair of of drawstring, the rubbing device avoid the winding drum the moment stopped rotating by
Continue to rotate in effect of inertia；
Auxiliary device, the auxiliary device includes the developing ring in the sacculus, for whether determining the sacculus
Reach corresponding depth；
Net grid support, the open end of the net grid support are movably set on the straight tube, and the sacculus is positioned at described
In the hollow cavity of net grid support, wherein the net grid support is absorbable material.
Further, the adjustment structure further includes pinion gear, and the pinion gear is fixedly and coaxially connected in a winding drum
On one end, and the pinion gear is engaged with the outer gear ring on the periphery for the tube body for being rotatably arranged on described sleeve pipe.
Further, the adjustment structure further includes slide block, and the slide block is fixedly and coaxially connected with the winding drum,
The rubbing device acts on the slide block.
Further, the rubbing device includes friction plate and several bullet parts, the rubbing surface of the friction plate and institute
Slide block contact is stated, one end of the bullet part is connected on the friction plate, and the other end of the bullet part is connected to described sleeve pipe
Mounting base on.
Further, the bullet part is pressure spring or elastic slice.
Further, the connecting pin of the active blade is equipped with movable block, the movable block and the pipe for being located at described sleeve pipe
Guide groove on the side wall of body is slidably matched.
Further, the cross section of the guide groove is T-shaped.
Further, the net grid support do not strut before it is in long strip, diameter be 5.5mm~6.5mm, length be 30mm~
50mm。
Further, the active blade is moved along the inner wall of described sleeve pipe.
Further, the straight tube is equipped with a pair of of baffle ring, and the edge of the open end of the net grid support is embedded in a pair
Between baffle ring.
It can be seen from the above technical scheme that it is an advantage of the invention that making the movable block of active blade by adjustment structure
It is moved in the guide groove of tube body to adjust the relative position of active blade and fixed baffle, can not will have to the fractures being softened
Position is blocked, and sacculus is expanded to preset distraction reduction direction, so that the fracture and injury at broken position will not be aggravated
Degree simultaneously avoids causing refracture；By being equipped with scale on the outside of straight tube, the depth that sacculus enters can be shown.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the state diagram of net grid support when sacculus of the invention does not strut.
Fig. 3 is the state diagram of net grid support when sacculus of the invention struts.
Fig. 4 is the structural schematic diagram of casing of the invention.
Fig. 5 is the top view of casing of the invention.
Fig. 6 is the structural schematic diagram of adjustment structure of the invention.
Fig. 7 is the partial structurtes enlarged diagram of Fig. 6.
In the figure, it is marked as expander 1, straight tube 11, baffle ring 111, Y-connection 12, sacculus 13, casing 2, tube body 21, lack
Mouthfuls 211, fixed baffle 212, guide groove 213, mounting base 214, active blade 22, movable block 221, adjustment structure 23, drawstring 231,
Winding drum 232, pinion gear 233, slide block 234, rubbing device 235, friction plate 2351, guide post 2352, bullet part 2353, outer gear ring
24, auxiliary device 3, handle 31, guide rod 32, developing ring 33, net grid support 4.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
Referring to figs. 1 to Fig. 7, a kind of PVP bioabsorbable stent as shown in Figure 1, Figure 4 and Figure 5, including expander 1, casing 2,
Auxiliary device 3 and net grid support 4, the expander 1 includes sequentially connected Y-connection 12, straight tube 11 and sacculus 13, described
Straight tube 11 is connected to vertically with a primary branch of the Y-connection 12, and the sacculus 13 uses distensible material, it is contemplated that is used
Crowd is young patient, and sacculus 13 is expanded, and cancellous bone Bone graft healing, sacculus 13 is shunk, local environment back to nature physiological status；
The described sleeve pipe 2 includes tube body 21, a pair of of mounting base 214, a pair of of active blade 22 and a pair of of adjustment structure 23, the straight tube
11 are slidably arranged in the tube body 21, and the straight tube 11 is equipped with graduated scale, can show the depth of the sacculus 13, a pair of
Adjustment structure 23 passes through a pair of of mounting base 214 and is arranged on the outer wall of the tube body 21, and a pair of of active blade 22 is movably arranged on
On the tube body 21, and the adjustment structure 23 controls a pair of of active blade 22 and does opposite or reverse motions, wherein the tube body
21 front edge, which is equipped with a notch 211, makes the front end of the tube body 21 form a fixed baffle 212, and a pair of of active blade
22 are symmetricly set on the two sides of the fixed baffle 212, can arbitrarily adjust the range not being softened, and the vertical of the notch 211 cuts
Face avoids excessive be deformed of 212 stress of fixed baffle from causing osteoporosis position is secondary to be damaged in half U-shaped channel-shaped
Wound；The auxiliary device 3 includes handle 31, guide rod 32 and several developing rings 33, and the guide rod 32 is fixedly connected on the hand
On handle 31, the handle 31 can be threadedly coupled with the primary branch of the Y-connection 12, and successively fixation is arranged the developing ring 33
In the guide rod 3, and the developing ring 33 is located in the sacculus 13, for determining it is corresponding deep whether the sacculus 13 reaches
Degree, the developing ring 33 are made of impermeable radioactive material, and developing ring 33 can determine the specific position of sacculus under CT machine when use
It sets, the guide rod 32 is detachably connected with the expander 1, is cleaned convenient for the sacculus 13, sterilizes the secondary use of progress；
The open end of the net grid support 4 is movably set on the straight tube 11, and the sacculus 13 is located in the net grid support 4
In cavity, wherein 4 surface of net grid support has calcium phosphor coating, and absorbable.
As shown in Figures 2 and 3, the net grid support 4 is in long strip before not strutting, and diameter is 5.5mm~6.5mm, length
For 30mm~50mm, the net grid support 4 strut after substantially in elliptical shape ball or spherical, diameter is up to 15mm~30mm, length meeting
Shorten to 20mm~30mm.
The straight tube 11 is equipped with a pair of of baffle ring 111, and the edge of the open end of the net grid support 4 is embedded in a pair of of baffle ring
Between 111, the net grid support 4 is avoided to cause surgery location inaccurate along 11 play of straight tube during push-in, also
It can quickly, be conveniently detached from the straight tube 11 during the sacculus 13 expands, avoid the sacculus 13 when taking out
Pulling the net grid support 4 deforms the net grid support 4, influences surgical effect.The net grid support 4 has centainly rigid
Property, it is not easy to deform after being softened.
As shown in Figure 4, Figure 5 and Figure 6, the adjustment structure 23 includes a pair of of winding drum of a pair of of drawstring 231, coaxial arrangement
232, it is fixedly and coaxially connected the pinion gear 233 on one end of a winding drum 232, is fixedly and coaxially connected with the winding drum 232
Slide block 234 and several rubbing devices 235, a pair of of active blade 22 passes through a pair of of drawstring 231 and is connected to a pair of of winding drum
On 232, stirring the slide block 234 can be the rotation of winding drum 232, and then a pair of of active blade 22 is driven to do opposite or phase
To movement, the rubbing device 235 is acted on the slide block 234, the rubbing device 235 avoids the winding drum 232
Continue the position control inaccuracy that rotation causes the active blade 22 due to effect of inertia in the moment stopped rotating, wherein
The pinion gear 233 is engaged with the outer gear ring 24 on the periphery for the tube body 21 for being rotatably arranged on described sleeve pipe 2；The drawstring
231 uses do not have flexible material to be made；The connecting pin of the active blade 22 is equipped with movable block 221, the movable block 221 with
Guide groove 213 on the side wall of the tube body 21 of described sleeve pipe 2 is slidably matched, and the guide groove 213 is located on the inner wall of tube body 21
It moves the active blade 22 along the inner wall of described sleeve pipe 2, avoids occurring large area scratch in moving process, wherein described
The cross section of guide groove 213 is T-shaped.
Preferably, the number of the rubbing device 235 is 3, makes 234 stress equalization of slide block.
As shown in fig. 7, the rubbing device 235 includes friction plate 2351, guide post 2352 and several bullet parts 2353, it is described
The rubbing surface of friction plate 2351 is contacted with the slide block 234, and one end of the guide post 2352 is fixedly connected on the friction plate
On 2351, the other end of the guide post 2352 is extended in the guide hole in the mounting base 214, and the guide post 2352 is set
It sets and avoids the slide block 234 that the friction plate 2351 is driven offset when rotating starting, if the friction plate 2351 is inclined
Will drive the revolution of slide block 234 when from, reset loosens the drawstring 231, and the active blade 22 will be in free
State, one end of the bullet part 2353 are connected on the friction plate 2351, and the other end of the bullet part 2353 is connected to described
In the mounting base 214 of casing 2, wherein the bullet part 2353 is pressure spring or elastic slice.
When determining an adjustment structure 23 is active adjustment structure 23, the driven adjustment structure 23 of another adjustment structure 23,
The slide block 234 for stirring active adjustment structure 23 makes the pinion gear 233 and the winding drum 232, by a pair of of active blade 22
It furthers, is rotated since the pinion gear 233 will drive the outer gear ring 24, by institute to 23 1 side of adjustment structure operated
It states outer gear ring 24 also to engage with the pinion gear 233 of driven adjustment structure 23, so driven adjustment structure 23 is in the pinion gear 233
Under the action of do the movement opposite with active adjustment structure 23, i.e. an adjustment structure 23 exists in rope closing, another adjustment structure 23
Rope is put, not only makes operating process laborsaving, the drawstring 231 is also avoided to be elongated influence judgement essence during Reusability
Degree, can also judge the move angle of the active blade 22, since the friction plate 2351 is kept out always in institute by several teeth
It states on slide block 234, so the power for stirring the slide block 234 needs to overcome the friction plate 2351 to the slide block 234
Frictional force can rotate, avoiding slide block 234 described in surgical procedure from rotating makes the active blade 22 generate mistake
Position, since the drawstring 231 is softwood matter, so a pair of of active blade 22 can only be close to active adjustment structure 23.
The application method of PVP bioabsorbable stent provided by the invention is: during surgery, casing 2 being passed through and is drilled out in advance
Channel is extend into fractured vertebral body, while determining the position of the fixed baffle 212, is then adjusted by the adjustment structure 23
The position of a pair of of active blade 22 can block the fracture site that cannot be softened, by the sacculus 13 on expander 1 from casing
After extending into the fracture site for needing distraction reduction in 2, sacculus 13 is injected centainly by the auxiliary branch pipe interface on Y-connection 12
Volume developer pressurization make its expansion, expand sacculus 13 to preset distraction reduction direction, by the centrum collapsed by
Step is propped up until being restored to clinical treatment requirement, and form a cavity for filling to insert the filling of the bones such as bone cement
Then the sacculus 13 is shunk, is taken out by object, then the sacculus 13 of net grid support 4 will be had on expander 1 again from set
The fracture site for needing distraction reduction is extend into pipe 2, the developer pressurization for injecting certain volume to sacculus 13 makes its expansion, in turn
So that the expansion of net grid support 4 is formed sacculus shape, play support fixed function, so that the fracture and injury at broken position will not be aggravated
Degree, and avoid causing refracture, the sacculus 13 is shunk again, is taken out, in the net grid support 4 of sacculus shape stays in
Side since the net grid support 4 has certain intensity, thus can temporarily play the role of the fixed fracture of bracket, then exist
Cancellous bone is filled in the net grid support 4, since the net grid support 4 is absorbable, the magnesium alloy bracket degradation dissolution
Afterwards, Bone graft healing, wherein the skeletal grain diameter of cancellous bone is within 1mm, preferably the diameter skeletal grain that is 0.5mm, and skeletal grain may be derived from ilium
Bone.
Embodiment two
Referring to figs. 1 to Fig. 7, a kind of PVP bioabsorbable stent as shown in Figure 1, Figure 4 and Figure 5, including expander 1, casing 2,
Auxiliary device 3 and net grid support 4, the expander 1 includes sequentially connected Y-connection 12, straight tube 11 and sacculus 13, described
Straight tube 11 is connected to vertically with a primary branch of the Y-connection 12, and the sacculus 13 uses distensible material, it is contemplated that is used
Crowd is young patient, and sacculus 13 is expanded, and cancellous bone Bone graft healing, sacculus 13 is shunk, local environment back to nature physiological status；
The described sleeve pipe 2 includes tube body 21, a pair of of mounting base 214, active blade 22 and a pair of of adjustment structure 23, and the straight tube 11 can
It is slidably arranged in the tube body 21, the straight tube 11 is equipped with graduated scale, can show that the depth of the sacculus 13, a pair are adjusted
Structure 23 passes through a pair of of mounting base 214 and is arranged on the outer wall of the tube body 21, and active blade 22 is movably arranged on the tube body
On 21, and a pair of of adjustment structure 23 controls active blade 22 and moves reciprocatingly, wherein the front edge of the tube body 21 is equipped with
One notch 211 makes the front end of the tube body 21 form a fixed baffle 212, can arbitrarily adjust the range not being softened, described to lack
The longitudinal section of mouth 211 avoids excessive be deformed of 212 stress of fixed baffle from causing osteoporosis position in half U-shaped channel-shaped
It is secondary to be damaged；The auxiliary device 3 includes handle 31, guide rod 32 and several developing rings 33, and the guide rod 32 is fixed to be connected
Connect on the handle 31, the handle 31 can be threadedly coupled with the primary branch of the Y-connection 12, the developing ring 33 according to
Secondary fixation is set in the guide rod 3, and the developing ring 33 is located in the sacculus 13, for determining whether the sacculus 13 arrives
Up to corresponding depth, the developing ring 33 is made of impermeable radioactive material, and developing ring 33 can determine sacculus under CT machine when use
Specific location, the guide rod 32 is detachably connected with the expander 1, cleaned convenient for the sacculus 13, sterilizes progress
Secondary use；The open end of the net grid support 4 is movably set on the straight tube 11, and the sacculus 13 is located at the grid
In the hollow cavity of bracket 4, wherein 4 surface of net grid support has calcium phosphor coating, and absorbable.
As shown in Figures 2 and 3, the net grid support 4 is in long strip before not strutting, and diameter is 5mm~7mm, and length is
32mm~48mm, the net grid support 4 strut after substantially in elliptical shape ball or spherical, diameter can contract up to 12mm~25mm, length
It is short to 17mm~28mm.
The straight tube 11 is equipped with a pair of of baffle ring 111, and the edge of the open end of the net grid support 4 is embedded in a pair of of baffle ring
Between 111, the net grid support 4 is avoided to cause surgery location inaccurate along 11 play of straight tube during push-in, also
It can quickly, be conveniently detached from the straight tube 11 during the sacculus 13 expands, avoid the sacculus 13 when taking out
Pulling the net grid support 4 deforms the net grid support 4, influences surgical effect.The net grid support 4 has centainly rigid
Property, it is not easy to deform after being softened.
As shown in Figure 4, Figure 5 and Figure 6, the adjustment structure 23 includes drawstring 231, winding drum 232, is fixedly and coaxially connected
Pinion gear 233 on one end of winding drum 232, the slide block 234 being fixedly and coaxially connected with the winding drum 232 and several rub
Device 235 is wiped, the both ends of active blade 22 are connected on a pair of of winding drum 232 by drawstring 231, stir the slide block 234
But the winding drum 232 rotates, and then active blade 22 is driven to move reciprocatingly, and the rubbing device 235 acts on described
On slide block 234, the rubbing device 235 avoids the winding drum 232 in the moment stopped rotating since effect of inertia continues
Rotation causes the position control inaccuracy of the active blade 22, wherein the pinion gear 233 be rotatably arranged on it is described
Outer gear ring 24 on the periphery of the tube body 21 of casing 2 engages；231 use of drawstring does not have flexible material to be made；The work
The connecting pin of dynamic baffle 22 is equipped with movable block 221, the movable block 221 and on the side wall of the tube body 21 of described sleeve pipe 2
Guide groove 213 is slidably matched, and the guide groove 213, which is located on the inner wall of tube body 21, makes the active blade 22 along described sleeve pipe 2
Wall is mobile, avoids occurring large area scratch in moving process, wherein the cross section of the guide groove 213 is T-shaped.
Preferably, the number of the rubbing device 235 is 4, makes 234 stress equalization of slide block.
As shown in fig. 7, the rubbing device 235 includes friction plate 2351, guide post 2352 and several bullet parts 2353, it is described
The rubbing surface of friction plate 2351 is contacted with the slide block 234, and one end of the guide post 2352 is fixedly connected on the friction plate
On 2351, the other end of the guide post 2352 is extended in the guide hole in the mounting base 214, and the guide post 2352 is set
It sets and avoids the slide block 234 that the friction plate 2351 is driven offset when rotating starting, if the friction plate 2351 is inclined
Will drive the revolution of slide block 234 when from, reset loosens the drawstring 231, and the active blade 22 will be in free
State, one end of the bullet part 2353 are connected on the friction plate 2351, and the other end of the bullet part 2353 is connected to described
In the mounting base 214 of casing 2, wherein the bullet part 2353 is pressure spring or elastic slice.
When determining an adjustment structure 23 is active adjustment structure 23, the driven adjustment structure 23 of another adjustment structure 23,
The slide block 234 for stirring active adjustment structure 23 makes the pinion gear 233 and the winding drum 232, by active blade 22 to just
It furthers, is rotated since the pinion gear 233 will drive the outer gear ring 24, due to described outer in 23 1 side of adjustment structure of operation
Gear ring 24 is also engaged with the pinion gear 233 of driven adjustment structure 23, so work of the driven adjustment structure 23 in the pinion gear 233
The movement opposite with active adjustment structure 23 is made under, i.e. an adjustment structure 23 is putting rope in rope closing, another adjustment structure 23,
Not only make operating process laborsaving, also avoids the drawstring 231 from being elongated influence during Reusability and judge precision, it can also
The move angle that the active blade 22 is judged by several teeth, since the friction plate 2351 is kept out always in the slide block
On 234, so the power for stirring the slide block 234 needs to overcome the friction plate 2351 to the frictional force of the slide block 234
It can rotate, avoiding slide block 234 described in surgical procedure from rotating makes the active blade 22 generate dislocation, by institute
Stating drawstring 231 is softwood matter, so active blade 22 can only be close to active adjustment structure 23.
The application method of PVP bioabsorbable stent provided by the invention is: during surgery, casing 2 being passed through and is drilled out in advance
Channel is extend into fractured vertebral body, while determining the position of the fixed baffle 212, is then adjusted by the adjustment structure 23
The position of active blade 22 can block the fracture site that cannot be softened, by the sacculus 13 on expander 1 from casing 2
After extending into the fracture site for needing distraction reduction, certain body is injected to sacculus 13 by the auxiliary branch pipe interface on Y-connection 12
Long-pending developer pressurization makes its expansion, expands sacculus 13 to preset distraction reduction direction, gradually by the centrum collapsed
It props up until being restored to clinical treatment requirement, and form a cavity for filling to insert the filling of the bones such as bone cement
Then the sacculus 13 is shunk, is taken out by object, then the sacculus 13 of net grid support 4 will be had on expander 1 again from set
The fracture site for needing distraction reduction is extend into pipe 2, the developer pressurization for injecting certain volume to sacculus 13 makes its expansion, in turn
So that the expansion of net grid support 4 is formed sacculus shape, play support fixed function, so that the fracture and injury at broken position will not be aggravated
Degree, and avoid causing refracture, the sacculus 13 is shunk again, is taken out, in the net grid support 4 of sacculus shape stays in
Side since the net grid support 4 has certain intensity, thus can temporarily play the role of the fixed fracture of bracket, then exist
Cancellous bone is filled in the net grid support 4, since the net grid support 4 is absorbable, the magnesium alloy bracket degradation dissolution
Afterwards, Bone graft healing, wherein the skeletal grain diameter of cancellous bone is within 1mm, preferably the diameter skeletal grain that is 0.5mm, and skeletal grain may be derived from ilium
Bone.
Embodiment three
A kind of forming method of PVP bioabsorbable stent, comprising: the threedimensional model for establishing vertebral body structure, to the threedimensional model
Data analysis and structural adjustment are carried out, determines different dimensions, the design of virtual bracket is completed using software, wherein is empty
The design method of quasi- bracket is the aperture position for determining bracket, reserves pipeline, global shape still size similar with practical centrum
Smaller, net grid support 4 is woven using nickel magnesium alloy silk, in sacculus 13 is installed, together by sacculus 13 and bracket, be compressed in
In casing 2, overlay film or not overlay film is may be selected in bracket, so as to complete the production of PVP bioabsorbable stent.
The application method of the PVP bioabsorbable stent includes: percutaneously to get through centrum access, is inserted into casing 2, discharges bracket.
The pressurization expansion of sacculus 13 is carried out, takes out sacculus 13 after discharging air.Then, bone cement is injected.In compression fracture of spine patient
In, traditional PVP technology be easy to cause the leakage of bone cement, influences clinical effectiveness.Then, developed after percutaneous sacculus centrum it is convex at
Shape art (PKP), still, after sacculus 13 takes out, the problem of still suffering from leakage.This bracket combines 13 technology of sacculus and bracket
The respective advantage of technology.Due to there is the presence of net grid support 4, overextended is not had to concern in 13 process of expansion of sacculus, meanwhile,
Overlay film frame can prevent bone cement from leaking, and overlay film frame not can reduce leakage.Net grid support 4 can be absorbed in 3-6 months, no
Influence the combination of bone cement and self bone tissue.Therefore, easy to operate, therapeutic effect is best.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of PVP bioabsorbable stent characterized by comprising
Expander (1), the expander (1) include sequentially connected Y-connection (12), straight tube (11) and sacculus (13)；
Casing (2), described sleeve pipe (2) include fixing baffle (212), a pair of of active blade (22) and a pair of of adjustment structure (23),
A pair of of active blade (22) and a pair of of adjustment structure (23) are arranged on described sleeve pipe (2), and the adjustment structure (23) is controlled
It makes a pair of of active blade (22) and does opposite or reverse motions, wherein the adjustment structure (23) includes a pair of of drawstring (231), same
A pair of of the winding drum (232) and several rubbing devices (235) of axis setting, a pair of of active blade (22) pass through a pair of of drawstring
(231) it is connected on a pair of of winding drum (232), the rubbing device (235) avoids the winding drum (232) what is stopped rotating
Moment continues to rotate due to effect of inertia；
Auxiliary device (3), the auxiliary device (3) includes the developing ring (33) in the sacculus (13), for determining
State whether sacculus (13) reaches corresponding depth；
The open end of net grid support (4), the net grid support (4) is movably set on the straight tube (11), and the sacculus
(13) in the hollow cavity of the net grid support (4), wherein the net grid support (4) is absorbable material.
2. PVP bioabsorbable stent according to claim 1, which is characterized in that the adjustment structure (23) further includes small tooth
(233) and slide block (234) are taken turns, the pinion gear (233) is fixedly and coaxially connected on one end of a winding drum (232), and institute
It states pinion gear (233) to engage with the outer gear ring (24) on the periphery for the tube body (21) for being rotatably arranged on described sleeve pipe (2), institute
It states slide block (234) to be fixedly and coaxially connected with the winding drum (232), the rubbing device (235) acts on the slide block
(234) on.
3. PVP bioabsorbable stent according to claim 2, which is characterized in that the rubbing device (235) includes friction plate
(2351) it is contacted with several bullet parts (2353), the rubbing surface of the friction plate (2351) with the slide block (234), the bullet
One end of part (2353) is connected on the friction plate (2351), and the other end of the bullet part (2353) is connected to described sleeve pipe
(2) in mounting base (214).
4. PVP bioabsorbable stent according to claim 1, which is characterized in that the connecting pin of the active blade (22) is set
Have movable block (221), the movable block (221) and the guide groove (213) on the side wall for the tube body (21) for being located at described sleeve pipe (2) are sliding
Dynamic cooperation.
5. PVP bioabsorbable stent according to claim 4, which is characterized in that the cross section of the guide groove (213) is T-shaped.
6. PVP bioabsorbable stent according to claim 1, which is characterized in that the net grid support (4) does not strut preceding in length
Strip, diameter are 5.5mm~6.5mm, and length is 30mm~50mm.
7. PVP bioabsorbable stent according to claim 1, which is characterized in that the active blade (22) is along described sleeve pipe
(2) inner wall is mobile.
8. PVP bioabsorbable stent according to claim 1, which is characterized in that the straight tube (11) is equipped with a pair of of baffle ring
(111), the edge of the open end of the net grid support (4) is embedded between a pair of of baffle ring (111).
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| CN201710511738.8A CN107115143B (en) | 2017-06-29 | 2017-06-29 | A kind of PVP absorbable stent and its molding method |
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| CN201710511738.8A CN107115143B (en) | 2017-06-29 | 2017-06-29 | A kind of PVP absorbable stent and its molding method |
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| CN110478015B (en) * | 2019-07-30 | 2023-09-15 | 张家港市中医医院 | A balloon-type cone cavity forming device for intravertebral fixation |
| CN112244974B (en) * | 2020-11-12 | 2025-01-03 | 上海市东方医院（同济大学附属东方医院） | Percutaneous stent expansion and bone scraping vertebroplasty device |
| CN113440186B (en) * | 2021-07-19 | 2022-07-22 | 王倩青 | A traction device used to assist single-port laparoscopy |
| CN114733048A (en) * | 2022-04-11 | 2022-07-12 | 重庆市人民医院 | Transurethral prostate treatment device |
| CN115530952B (en) * | 2022-09-24 | 2025-04-18 | 北京中诺恒康生物科技有限公司 | A device for expanding and shaping the vertebral body with a curved and degradable magnesium cage |
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|---|---|---|---|---|
| CN201295279Y (en) * | 2008-11-10 | 2009-08-26 | 创生医疗器械(江苏)有限公司 | Interspinal strutting device |
| CN201798792U (en) * | 2010-10-01 | 2011-04-20 | 贺新宁 | Balloon resetting apparatus for orthopedics department |
| CN106073884A (en) * | 2016-06-16 | 2016-11-09 | 南京鼓楼医院 | A kind of PVP vertebral oriented dilated balloon-system and manufacture method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012134592A1 (en) * | 2011-03-25 | 2012-10-04 | Advanced Polymers, Inc. | Apparatus and methods for accessing and dilating bone structures using a narrow gauge cannula |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201295279Y (en) * | 2008-11-10 | 2009-08-26 | 创生医疗器械(江苏)有限公司 | Interspinal strutting device |
| CN201798792U (en) * | 2010-10-01 | 2011-04-20 | 贺新宁 | Balloon resetting apparatus for orthopedics department |
| CN106073884A (en) * | 2016-06-16 | 2016-11-09 | 南京鼓楼医院 | A kind of PVP vertebral oriented dilated balloon-system and manufacture method thereof |
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