CN112120778A - Centrum struts filling device and propeller - Google Patents
Centrum struts filling device and propeller Download PDFInfo
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- CN112120778A CN112120778A CN202010982346.1A CN202010982346A CN112120778A CN 112120778 A CN112120778 A CN 112120778A CN 202010982346 A CN202010982346 A CN 202010982346A CN 112120778 A CN112120778 A CN 112120778A
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- sleeve
- mandrel
- expansion
- expansion sleeve
- ring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- 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, e.g. tourniquets
- 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, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8802—Equipment for handling bone cement or other fluid fillers
- A61B17/8805—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it
- A61B17/8816—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
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Abstract
The invention relates to the field of medical instruments, and on the one hand, provides a vertebral body expanding and filling device which comprises an expansion sleeve, a mandrel and a limiting ring, wherein the expansion sleeve is made of a nonmetal material, a plurality of slots are formed in the expansion sleeve, the expansion sleeve is sleeved on the mandrel, a blocking structure is arranged at the front end part of the mandrel, a ring positioning structure and a connecting structure matched with a pull rod are arranged at the tail part of the mandrel, the limiting ring is positioned behind the expansion sleeve, the limiting ring is pushed forwards to extrude the expansion sleeve to expand the expansion sleeve, the limiting ring is connected to the ring positioning structure to keep the expansion state of the expansion sleeve, the aim of expanding and filling a vertebral body is fulfilled, and the risk problem of leakage of vertebral body filling bone cement is solved because the bone. On the other hand, the propeller adopts the working principle of a forward and reverse internal and external thread structure, and realizes the rotation of the screw rod through the design of threads and thread pitches, and the internal and external sleeves move to two directions according to different speeds, so the propeller is simple and convenient to operate.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a vertebral body expanding and filling device and a propeller.
Background
Vertebroplasty (PVP) and kyphoplasty (PKP) are the most effective and simplest surgical methods for treating vertebral compression fracture at present, wherein the PKP adopts a balloon or other mechanical devices to open a compressed vertebral body, so that kyphotic deformity is partially or completely corrected, and then a filling agent (bone cement) is injected to strengthen the vertebral body, thereby achieving the purposes of stabilizing fracture, recovering vertebral mechanical strength and relieving pain.
However, the greatest risk of this operation is leakage when injecting bone cement, and therefore this operation is particularly emphasized on the state when injecting bone cement, where the risk of leakage is high when the bone cement is too thin and injection is difficult when the bone cement is too thick, and the filling is not full.
Therefore, in view of the current situation of high risk of injecting bone cement into a vertebral body in the prior art, it is an urgent need to solve the problem of developing a vertebral body distraction device and a propeller for implanting the vertebral body distraction device into the vertebral body.
Disclosure of Invention
On one hand, aiming at the problem that the risk of injecting bone cement into the vertebral body is high in the prior art, the invention provides a vertebral body expanding and filling device which comprises an expansion sleeve, a mandrel and a limiting ring, wherein the expansion sleeve is made of a non-metal material, a plurality of open grooves cut along the axial direction of the expansion sleeve are formed in the expansion sleeve, the open grooves are arranged around the expansion sleeve, the expansion sleeve is sleeved on the mandrel, a blocking structure used for blocking the expansion sleeve from moving downwards is arranged at the front end part of the mandrel, the limiting ring is connected with the mandrel in a matched mode, the limiting ring is located behind the expansion sleeve, a ring positioning structure is arranged on the mandrel, the limiting ring is pushed forwards to extrude the expansion sleeve to be expanded, and the limiting ring is connected to the ring positioning structure to keep the expansion sleeve in an expanded state; the rear part of the mandrel is provided with a pull rod connecting structure used for being connected with the propeller, and the mandrel is formed by hinging a plurality of movable joints. The expansion sleeve is made of non-metal materials, such as peek materials, and can be implanted into a human body; the expansion sleeve has an expansion function by arranging the slots on the expansion sleeve, the slots are formed on the sleeve at intervals of a certain length, the circumference is divided equally by 4-6, the included angle of each segment of slot is 60-90 degrees, the expansion part can be designed into various specifications by adjusting the initial length and the length of the slots of the expansion sleeve, and a doctor can select the required specification for use according to the condition of a patient; the mandrel is hinged by a plurality of movable joints, and the mandrel is arranged in a hinge structure, so that the expanded sleeve can be bent at a certain angle with the direction of inserting the instrument according to the shape in the vertebral body, and the upper and lower end plates are prevented from being damaged by forced expansion; the expansion sleeve is sleeved on the mandrel through the expansion sleeve, the expansion sleeve can be expanded by pushing the limiting ring, the expansion sleeve is easy to place in a contraction state, the expansion sleeve is expanded to fill the vertebral body after being placed in the contraction state, and risks can be reduced compared with the filling of bone cement.
Furthermore, four movable joints are arranged, and the connecting structures at two adjacent hinged positions are in a vertical relation. The four movable joints are arranged into two groups of mutually perpendicular structures, so that the bending to a certain degree is realized to better adapt to the internal shape of the vertebral body.
Furthermore, the pull rod connecting structure is a threaded hole formed in the rear end face of the mandrel. The detachable connection with the pull rod of the propeller is realized.
Further, the spacing collar suit is on the dabber, be provided with the snap ring on the spacing collar, ring location structure includes the elastic hook, and after the snap ring crossed the elastic hook, the elastic hook relied on self elasticity to outwards pop out and hook the snap ring. Through setting up the cooperation of elastic hook and snap ring, the snap ring is crossed behind the elastic hook and is blocked it, prevents that the spacing ring from moving backward to keep the inflation state after the expansion tube struts.
Further, the spacing ring suit is on the dabber, be provided with the expansion incision that link up on the lateral wall of spacing ring, ring location structure includes the annular groove, and when the spacing ring removed the position of annular groove, the spacing ring can contract the card and go into in the annular groove. Due to the existence of the expansion incision, the limiting ring can be contracted after entering the annular groove, and the limit of the pushed limiting ring is realized, so that the expanded state of the expanded sleeve after expansion is kept.
On the other hand, in order to realize better implantation of the vertebral body distraction filling device into a vertebral body, the invention also provides a propeller, which comprises the vertebral body distraction filling device, a pull rod, an inner sleeve and an outer sleeve which are sequentially arranged from inside to outside, wherein the front end of the pull rod is connected with the mandrel, the front end of the inner sleeve props against the limiting ring, the propeller also comprises an inner threaded rod, an outer threaded rod and a limiting block, the rear end of the inner sleeve is connected with the internal threads of the inner threaded rod and the outer threaded rod through an inner sleeve connecting structure, the rear end of the outer sleeve is connected with the external threads of the inner threaded rod and the outer threaded rod through an outer sleeve connecting structure, the limiting block limits the rotation of the inner sleeve and the outer; before the expansion sleeve is unfolded, the expansion sleeve is positioned in the outer sleeve, the inner sleeve moves forwards while the outer sleeve moves backwards by rotating the inner threaded rod and the outer threaded rod, and the inner sleeve pushes the limiting ring to move forwards so as to unfold the expansion sleeve. The mandrel is tensioned through the pull rod so that the inner sleeve can push the limiting ring forwards to move forwards along the mandrel, the expansion sleeve is expanded, and the transmission speed of the inner sleeve and the outer sleeve is coordinated to ensure that the expansion sleeve is smoothly expanded by arranging certain inner and outer screw pitches on the inner and outer threaded rods. The front end of the outer sleeve is sleeved outside the expansion sleeve, and the expansion sleeve contained in the outer sleeve is not deformed when the restraint expansion sleeve is extruded by the inner sleeve.
Further, still include shell, handle and thrust bearing, the stopper links firmly with the shell, and thrust bearing installs the rear portion at the shell, the rear portion of inside and outside threaded rod is passed thrust bearing and is connected with the handle behind the shell. The axial resistance of the screw rod during rotation is reduced by arranging the thrust bearing, and the rotation of the inner threaded rod and the outer threaded rod can be driven by rotating the handle, so that the operation is convenient.
Further, the first scheme is as follows: the inner sleeve connecting structure comprises an inner sleeve seat, a long slotted hole for accommodating a limiting block is formed in the middle of the inner sleeve seat, and reverse external threads are arranged at the rear part of the inner sleeve seat and are matched and connected with internal threads of the internal and external threaded rods; the outer sleeve connecting structure comprises an outer sleeve seat, a long slotted hole for accommodating the limiting block is also formed in the middle of the outer sleeve seat, and internal threads are formed in the rear part of the outer sleeve seat and are matched and connected with external threads of the internal and external threaded rods; the stopper passes the slotted hole, the outside of stopper is connected with the shell cover, the shell covers and installs the handle, the centre of stopper is provided with the through-hole, the pull rod passes from this through-hole, the rear portion of pull rod is connected with the pull rod hand wheel.
Further, the second scheme is as follows: the inner sleeve connecting structure comprises an inner sleeve seat, an inner sleeve connecting rod and a connecting seat, the inner sleeve seat is fixedly connected with the lower part of the inner sleeve connecting rod, the upper part of the inner sleeve connecting rod is fixedly connected with the connecting seat, the connecting seat is in fit connection with internal threads of an internal threaded rod and an external threaded rod through a screw rod, the limiting block is positioned in an inner cavity of the inner sleeve connecting rod, the rear end of the pull rod penetrates through the limiting block and then is fastened through a nut, and an indicating needle is arranged on the connecting seat and is displayed from an; the outer sleeve connecting structure comprises an outer sleeve seat and an outer sleeve connecting rod, the rear part of the outer sleeve is fixedly connected with the outer sleeve seat, the outer sleeve seat is connected with the lower part of the outer sleeve connecting rod, and the upper part of the outer sleeve connecting rod is connected with the external threads of the internal and external threaded rods in a matched mode.
Furthermore, the mandrel and the limiting ring are made of titanium alloy materials.
According to the technical scheme, the invention has the following advantages:
the invention provides a vertebral body expanding and filling device, wherein an expanding and filling part is made of a material meeting the biocompatibility requirement of an implanted medical instrument, an expanding sleeve is made of a non-metal material, a mandrel and a limiting ring are made of a titanium alloy material, a collapsed vertebral body can be lifted during expansion, the height of the vertebral body is recovered, and the risk of bone cement leakage is fundamentally solved because bone cement is not required to be injected. The mandrel adopts two pairs of hinge structures which are mutually vertical, so that the expanded sleeve can be bent at a certain angle with the direction of the device implantation according to the shape in the vertebral body, and the upper and lower end plates are prevented from being damaged by forced expansion. By adjusting the initial length of the expansion sleeve and the length of the slot, the expansion part can be designed into various specifications, and a doctor can select the required specification according to the condition of a patient for use.
The invention also provides a propeller which has two schemes, adopts the working principle of a forward and reverse internal and external thread structure, realizes the rotation of the screw rod through the design of threads and thread pitches, moves the internal and external sleeves in two directions according to different speeds, and has compact structure and simple and convenient operation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of the mandrel and the stop collar in fig. 1.
Fig. 3 is an overall view of the outside of fig. 1.
Fig. 4 is another schematic structural diagram of embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of the mandrel and the stop collar shown in fig. 2.
Fig. 6 is an overall view of the outside of fig. 2.
Fig. 7 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 8 is a side view of embodiment 2 of the present invention.
Fig. 9 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 10 is a schematic view of embodiment 3 of the present invention after the upper half of the housing is hidden.
Figure 11 is a schematic diagram of the structure of an expanded casing according to embodiments 1-4 of the present invention.
In the figure, 1, an expansion sleeve, 2, a mandrel, 3, a limiting ring, 4, a pull rod, 5, an inner sleeve, 6, an outer sleeve, 7, a limiting block, 8, an inner threaded rod, an outer threaded rod, 9, a thrust bearing, 10, a handle, 11, a pull rod hand wheel, 12, a shell, 21, a threaded hole, 22, an elastic hook, 31, a snap ring, 32, an expansion notch, 51, an inner sleeve seat, 53, an inner sleeve connecting rod, 54, a connecting seat, 55, a screw rod, 56, an indicating needle, 61, an outer sleeve seat, 63, an outer sleeve connecting rod, 101 and a groove.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
Detailed description of the preferred embodiment 1
As shown in fig. 1 to 6 and fig. 11, the present embodiment provides a vertebral body distraction filling device, which mainly comprises an expansion sleeve 1, a mandrel 2 and a stop collar 3, wherein the mandrel 2 and the stop collar 3 are made of titanium alloy, the expansion sleeve 1 is made of peek non-metal material and can be implanted in a human body, the expansion sleeve 1 is provided with a plurality of slots 101 cut along the axial direction of the expansion sleeve 1, the slots 101 are arranged around the expansion casing 1, the expansion casing 1 is provided with the slots 101, the slots 101 are arranged on the casing at intervals of certain length, the circumference 4-6 is equally divided, the included angle of each segment of the slot is 60-90 degrees, and by adjusting the initial length of the expansion casing 1, the length and the number of the slots 101, the expansion part can be designed into various specifications, and doctors can select the required specification for use according to the condition of patients; the expansion sleeve 1 is sleeved on the mandrel 2, the front end part of the mandrel 2 is provided with a blocking structure for blocking the expansion sleeve 1 from moving downwards, the limiting ring 3 is connected with the mandrel 2 in a matched manner, the limiting ring 3 is positioned behind the expansion sleeve 1, the mandrel 2 is provided with a ring positioning structure, the limiting ring 3 is pushed forwards to extrude the expansion sleeve 1 to expand the expansion sleeve, and the limiting ring 3 is connected to the ring positioning structure to keep the expansion state of the expansion sleeve 1; the rear portion of dabber 2 is provided with the 4 connection structure of pull rod that are used for being connected with the propeller, dabber 2 forms through many freely movable joints are articulated, in this scheme, freely movable joints are provided with four, connection structure at two adjacent articulated positions is the vertical relation, realize being the crooked of certain angle towards the equidirectional not, set up dabber 2 into hinge structure, the sleeve pipe after can making the inflation has the crooked of certain angle with the direction that the apparatus was put into according to the shape in the vertebra, better adaptation centrum internal shape, the endplate about the inflation damage of preventing forces.
Wherein, the connecting structure of the pull rod 4 is a threaded hole 21 arranged on the rear end surface of the mandrel 2, and the pull rod 4 is detachably connected with the propeller.
In some embodiments, the retainer ring 3 is sleeved on the mandrel 2, the retainer ring 3 is provided with a snap ring 31, the ring positioning structure comprises an elastic hook 22, after the snap ring 31 passes over the elastic hook 22, the elastic hook 22 is popped out outwards by means of elasticity of the elastic hook 22 and hooks the snap ring 31, and by arranging the elastic hook 22 and the snap ring 31 to be matched, the snap ring 31 passes over the elastic hook 22 and then the elastic hook 22 clamps the elastic hook, so that the retainer ring 3 is prevented from moving backwards, and the expanded state of the expanded sleeve 1 after being expanded is kept.
In other embodiments, the stop collar 3 is sleeved on the mandrel 2, the through expansion notch 32 is arranged on the side wall of the stop collar 3, the stop collar 3 is installed on the mandrel 2 after being expanded to increase the diameter through the expansion notch 32, the collar positioning structure comprises an annular groove, when the stop collar 3 moves to the position of the annular groove, the stop collar 3 can be shrunk and clamped into the annular groove, due to the existence of the expansion notch 32, the stop collar 3 can be shrunk after entering the annular groove, the limit collar 3 after being pushed is limited, and the expansion state of the expansion sleeve 1 after being propped open is maintained.
Detailed description of the preferred embodiment 2
As shown in fig. 7 and 8 (which is one of the schemes), the present embodiment provides a propeller, including the vertebral body distraction filling device in embodiment 1, further including a housing 12, a handle 10, a thrust bearing 9, and a pull rod 4, an inner sleeve 5 and an outer sleeve 6, which are sequentially arranged from inside to outside, wherein a screw head is arranged at the front end of the pull rod 4 and connected with the mandrel 2, the front end of the inner sleeve 5 abuts against the limit ring 3, the propeller further includes an inner and outer threaded rod 8 and a limit block 7, the rear end of the inner sleeve 5 is connected with the internal thread of the inner and outer threaded rod 8 through the inner sleeve 5 connection structure, the rear end of the outer sleeve 6 is connected with the external thread of the inner and outer threaded rod 8 through the outer sleeve 6 connection structure, the limit block 7 limits the rotation of the inner sleeve 5 and the outer sleeve 6, and the pull rod; before expansion sleeve 1 struts, expansion sleeve 1 is located outer tube 6, can make inner tube 5 forward movement when outer tube 6 backward movement through rotating inside and outside threaded rod 8, and inner tube 5 promotes spacing ring 3 forward movement and then struts expansion sleeve 1, and stopper 7 links firmly with shell 12, and thrust bearing 9 installs at the rear portion of shell 12, and the rear portion of inside and outside threaded rod 8 is passed thrust bearing 9 and is connected with handle 10 behind shell 12. The mandrel 2 is tensioned through the pull rod 4 to realize that the inner sleeve 5 pushes the limiting ring 3 forwards to move forwards along the mandrel 2, the expansion sleeve 1 is expanded, a certain internal and external screw pitch is arranged on the internal and external screw thread rods 8 to coordinate the forward and backward moving speeds of the inner sleeve 5 and the outer sleeve 6, the expansion sleeve 1 is sequentially expanded from front to back, the front end of the outer sleeve 6 is sleeved outside the expansion sleeve 1, and when the expansion sleeve 1 is restrained to be extruded by the inner sleeve 5, the expansion sleeve 1 contained in the outer sleeve 6 is not deformed.
The further improvement is that: the inner sleeve 5 connecting structure comprises an inner sleeve seat 51, a long slotted hole for accommodating the limiting block 7 is formed in the middle of the inner sleeve seat 51, and reverse external threads are arranged at the rear part of the inner sleeve seat 51 and are matched and connected with internal threads of the internal and external threaded rods 8; the outer sleeve 6 connecting structure comprises an outer sleeve seat 61, a long slot hole for accommodating the limiting block 7 is also formed in the middle of the outer sleeve seat 61, and internal threads are formed in the rear part of the outer sleeve seat 61 and are matched and connected with external threads of the internal and external threaded rods 8; the limiting block 7 penetrates through the long-slot hole, the outer side of the limiting block 7 is connected with a shell 12 cover, the shell 12 cover is provided with a handle 10, a through hole is formed in the middle of the limiting block 7, the pull rod 4 penetrates through the through hole, and the rear portion of the pull rod 4 is connected with a pull rod hand wheel 11.
Detailed description of preferred embodiments 3
As shown in fig. 9 and 10 (which is another solution), the present embodiment provides a pusher different from that of embodiment 2, which comprises the vertebral body distraction filling device of embodiment 1, a shell with upper and lower shells detachably connected together, a handle 10, a thrust bearing 9, the pull rod 4, the inner sleeve 5 and the outer sleeve 6 are sequentially arranged from inside to outside, a threaded head is arranged at the front end of the pull rod 4 and connected with the mandrel 2, the front end of the inner sleeve 5 props against the limiting ring 3, the pull rod further comprises an inner threaded rod 8, an outer threaded rod 8 and a limiting block 7, the rear end of the inner sleeve 5 is connected with the internal thread of the inner threaded rod 8 through a connecting structure of the inner sleeve 5, the rear end of the outer sleeve 6 is connected with the external thread of the inner threaded rod 8 through a connecting structure of the outer sleeve 6, the limiting block 7 limits the rotation of the inner sleeve 5 and the outer sleeve 6, and the pull; before expansion sleeve 1 struts, expansion sleeve 1 is located outer tube 6, can make inner tube 5 forward movement when outer tube 6 backward movement through rotating inside and outside threaded rod 8, and inner tube 5 promotes spacing ring 3 forward movement and then struts expansion sleeve 1, and stopper 7 links firmly with shell 12, and thrust bearing 9 installs at the rear portion of shell 12, and the rear portion of inside and outside threaded rod 8 is passed thrust bearing 9 and is connected with handle 10 behind shell 12. The mandrel 2 is tensioned through the pull rod 4 to realize that the inner sleeve 5 pushes the limiting ring 3 forwards to move forwards along the mandrel 2, the expansion sleeve 1 is expanded, a certain internal and external screw pitch is arranged on the internal and external screw thread rods 8 to coordinate the forward and backward moving speeds of the inner sleeve 5 and the outer sleeve 6, the expansion sleeve 1 is sequentially expanded from front to back, the front end of the outer sleeve 6 is sleeved outside the expansion sleeve 1, and when the expansion sleeve 1 is restrained to be extruded by the inner sleeve 5, the expansion sleeve 1 contained in the outer sleeve 6 is not deformed.
The further improvement is that: the inner sleeve 5 connecting structure comprises an inner sleeve seat 51, an inner sleeve connecting rod 53 and a connecting seat 54, the inner sleeve seat 51 is fixedly connected with the lower part of the inner sleeve connecting rod 53, the upper part of the inner sleeve connecting rod 53 is fixedly connected with the connecting seat 54, the connecting seat 54 is in fit connection with the internal threads of the internal and external threaded rods 8 through a screw 55, the limiting block 7 is positioned in the inner cavity of the inner sleeve connecting rod 53, the rear end of the pull rod 4 penetrates through the limiting block 7 and then is fastened through a nut, and the connecting seat 54 is provided with an indicating needle 56; the outer sleeve 6 connecting structure comprises an outer sleeve seat 61 and an outer sleeve connecting rod 63, the rear part of the outer sleeve 6 is fixedly connected with the outer sleeve seat 61, the outer sleeve seat 61 is connected with the lower part of the outer sleeve connecting rod 63, and the upper part of the outer sleeve connecting rod 63 is connected with the external threads of the internal and external threaded rods 8 in a matched mode.
The terms "upper", "lower", "outside", "inside", and the like in the description and claims of the present invention and the above-described drawings (if any) are used for distinguishing relative positions without necessarily being construed qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The centrum distraction filling device is characterized by comprising an expansion sleeve, a mandrel and a limiting ring, wherein the expansion sleeve is made of nonmetal materials, the expansion sleeve is provided with a plurality of slots which are cut along the axial direction of the expansion sleeve, the slots are arranged around the expansion sleeve, the expansion sleeve is sleeved on the mandrel, the front end part of the mandrel is provided with a blocking structure for blocking the expansion sleeve from moving downwards, the limiting ring is connected with the mandrel in a matching way, the limiting ring is positioned behind the expansion sleeve, the mandrel is provided with a ring positioning structure, the limiting ring is pushed forwards to extrude the expansion sleeve to expand the expansion sleeve, and the limiting ring is connected to the ring positioning structure to keep the expansion state of the expansion sleeve; the rear part of the mandrel is provided with a pull rod connecting structure used for being connected with the propeller, and the mandrel is formed by hinging a plurality of movable joints.
2. The vertebral body distracting filling device of claim 1, wherein there are four of said movable joints, and the connecting structures at two adjacent hinged locations are in a perpendicular relationship.
3. The vertebral body distraction filling device of claim 1, wherein the pull rod attachment structure is a threaded hole disposed on the rear end face of the mandrel.
4. The vertebral body distraction filling device of any one of claims 1-3, wherein the stop ring is sleeved on the mandrel, a snap ring is arranged on the stop ring, and the ring positioning structure comprises an elastic hook which springs outwards by means of the elasticity of the elastic hook and hooks the snap ring and blocks the expansion sleeve from being pulled out backwards after the stop ring passes over the elastic hook.
5. The vertebral body distraction filling device according to any one of claims 1 to 3, wherein the stop collar is sleeved on the mandrel, a through expansion cut is arranged on the side wall of the stop collar, the collar positioning structure comprises an annular groove, the collar positioning structure is arranged at the tail part of the mandrel after the diameter is enlarged by the expansion of the expansion cut, and when the stop collar moves to the position of the annular groove, the stop collar can be shrunk and clamped into the annular groove and stop the expansion sleeve from being pulled out backwards.
6. A propeller, characterized by, include the centrum of any claim 1-5 struts the filling device, also include the tie rod, inner cannula and outer thimble set up from inside to outside sequentially, the front end of the said tie rod is connected with mandrel, the front end of the said inner cannula supports the spacing ring, also include internal and external threaded rod and stopper, the rear end of the said inner cannula passes the female threaded connection of the internal threaded rod of the female connection structure and internal and external threaded rod, the rear end of the said outer thimble passes the male connection structure and external threaded connection of the external threaded rod of the external and internal threaded rod, the said stopper rotates the spacing to inner cannula and outer cannula, the said tie rod is connected with stopper and can strain the mandrel; before the expansion sleeve is unfolded, the expansion sleeve is positioned in the outer sleeve, the inner sleeve moves forwards while the outer sleeve moves backwards by rotating the inner threaded rod and the outer threaded rod, and the inner sleeve pushes the limiting ring to move forwards so as to unfold the expansion sleeve.
7. The propeller as recited in claim 6, further comprising a housing, a handle and a thrust bearing, wherein the stopper is fixedly connected to the housing, the thrust bearing is installed at the rear portion of the housing, and the rear portions of the inner and outer threaded rods penetrate through the thrust bearing and the housing to be connected to the handle.
8. The propeller as claimed in claim 7, wherein the inner sleeve connection structure comprises an inner sleeve seat, a long slot hole for accommodating the limiting block is arranged in the middle of the inner sleeve seat, and reverse external threads are arranged at the rear part of the inner sleeve seat and are matched and connected with internal threads of the internal and external threaded rods; the outer sleeve connecting structure comprises an outer sleeve seat, a long slotted hole for accommodating the limiting block is also formed in the middle of the outer sleeve seat, and internal threads are formed in the rear part of the outer sleeve seat and are matched and connected with external threads of the internal and external threaded rods; the stopper passes the slotted hole, the outside of stopper is connected with the shell cover, the shell covers and installs the handle, the centre of stopper is provided with the through-hole, the pull rod passes from this through-hole, the rear portion of pull rod is connected with the pull rod hand wheel.
9. The propeller as claimed in claim 7, wherein the inner sleeve connecting structure comprises an inner sleeve seat, an inner sleeve connecting rod and a connecting seat, the inner sleeve seat is fixedly connected with the lower portion of the inner sleeve connecting rod, the upper portion of the inner sleeve connecting rod is fixedly connected with the connecting seat, the connecting seat is connected with the internal threads of the inner and outer threaded rods in a matched mode through a screw, the limiting block is located in the inner cavity of the inner sleeve connecting rod, the rear end of the pull rod penetrates through the limiting block and then is fastened through a nut, and an indicating needle is arranged on the connecting seat and is displayed through an opening window of the; the outer sleeve connecting structure comprises an outer sleeve seat and an outer sleeve connecting rod, the rear part of the outer sleeve is fixedly connected with the outer sleeve seat, the outer sleeve seat is connected with the lower part of the outer sleeve connecting rod, and the upper part of the outer sleeve connecting rod is connected with the external threads of the internal and external threaded rods in a matched mode.
10. The propeller of claim 6, wherein the mandrel and the stop collar are both made of a titanium alloy material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010982346.1A CN112120778B (en) | 2020-09-17 | 2020-09-17 | Centrum struts filling device and propeller |
| PCT/CN2020/124581 WO2022057017A1 (en) | 2020-09-17 | 2020-10-29 | Vertebral body expanding and filling device and propeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010982346.1A CN112120778B (en) | 2020-09-17 | 2020-09-17 | Centrum struts filling device and propeller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112120778A true CN112120778A (en) | 2020-12-25 |
| CN112120778B CN112120778B (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010982346.1A Active CN112120778B (en) | 2020-09-17 | 2020-09-17 | Centrum struts filling device and propeller |
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| WO (1) | WO2022057017A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022057505A1 (en) * | 2020-09-17 | 2022-03-24 | 山东冠龙医疗用品有限公司 | Vertebral-body spreading and filling apparatus and pushing device |
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| WO2022057017A1 (en) | 2022-03-24 |
| CN112120778B (en) | 2022-03-25 |
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