CN214434448U - Centrum internal expanding device based on three-column fixation and implantation sleeve - Google Patents

Abstract

The utility model discloses an expansion device and implantation sleeve pipe in centrum based on three posts are fixed, implant (1) and inside hollow screw (2) of middle fretwork form integral type or disconnect-type expansion device, implantation sleeve pipe (3) include outer tube (31) and interior pole (32), interior pole (32) can be at outer tube (31) internalization, and the one end of interior pole (32) is equipped with external screw thread (321) and implants the centrum internal expansion device of integration centrum internal expansion device or separation matched stack formula through working channel (4) of establishing target area in the centrum, through effort between outer tube (31) and interior pole (32), shorten implant (1) preceding near-end distance, will implant (1) middle part inflation, certain holding power has, the mechanics supports in the realization art immediately. And the implant (1) and the screw (2) are used for realizing three-column fixation, so that the stability of the expansion device in the vertebral body is further enhanced.

Description

Centrum internal expanding device based on three-column fixation and implantation sleeve

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to expansion device and implantation sleeve pipe in centrum based on three posts are fixed.

Background

Osteoporosis is an age-related disease. By 2020, population numbers at and above the age of 60 will for the first time exceed population numbers below the age of 5. The aged of 60 years and older worldwide is 8.41 billion at present, and 20 billion is expected to be reached by 2050. Osteoporosis and its associated complications have become a major health-threatening condition for the elderly. Of these, about 39% of women over the age of 65 suffer from osteoporotic vertebral compression fractures.

The most widely adopted treatment methods at present are Percutaneous Vertebroplasty (PVP) and Percutaneous Kyphoplasty (PKP), and the goal of the methods is to fill Polymethylmethacrylate (PMMA) bone cement into the fractured vertebral body, restore the height of the vertebral body as much as possible, realize anterior-medial column fixation, reshape the stability of the vertebral column, and damage the transmission of peripheral nerve pain by the thermal effect of the bone cement, thereby achieving the purpose of effective relief. As the number of cases increases, clinicians are becoming aware that the vertebral body height restored during PKP procedures may be temporary, as partial or even complete vertebral body collapse often occurs after balloon deflation. Bone cement leakage is also likely to occur if too much bone cement is injected during the operation. After operation, the cement is displaced and the vertebral body is fractured again and other complications are caused by poor crosslinking between the cement and the cancellous bone or obvious difference between the rigidity of the cement and the rigidity of the vertebral body. Additional pain is brought to the patient and the medical expense is increased.

Some enterprises have been successively introduced with a variety of different structure-based, such as: vertebral Body steering

And the like, the vertebral body reinforcing system can restore the height of the vertebral body without a balloon in the operation. Although not widely popularized and entered into clinic, a certain effect is achieved. This also suggests how to maintain the height of the vertebral body after reduction in the operation, improve the fixation stability, reduce the rigidity difference between the inner plant and the cancellous bone, and thus improve the curative effect of the operation, which is still a problem to be solved urgently in the current spinal surgery.

SUMMERY OF THE UTILITY MODEL

For solving the problem that above-mentioned prior art exists and not enough, the utility model provides an expansion device and implantation sleeve pipe in centrum based on three post are fixed, aim at found one kind can strut immediately in the art, maintains the centrum height, and elastic modulus is less than bone cement to provide the expansion device and implantation method in centrum of ideal stability based on three post fixation theory. So as to further improve the curative effect of the osteoporotic vertebral fracture by a simple, feasible and cheap way.

The following design structure and design scheme are specifically adopted:

the utility model provides an expansion device in centrum based on three post are fixed, includes middle fretwork slender type implant (1) and inside hollow screw (2), is equipped with first internal thread (11) in the distal end port of implant (1), and the near-end port of implant (1) is connected as an organic whole with screw (2) head.

Preferably, the implant (1) and the screw (2) can also be assembled separately, by providing a second internal thread (12) in the proximal end of the implant (1) adapted to the thread of the head of the screw (2).

Preferably, the middle part of the implant (1) is of a net structure, holes with different shapes are formed in a crossed mode, the middle part of the implant (1) is expanded by reducing the distance between the far end and the near end of the implant (1), and the slender implant (1) is expanded into the net-shaped implant (1) with certain supporting force.

Preferably, the threads from the head part to the outer side of the tail part of the screw (2) are sparse in front and dense in back, and the tail part of the screw (2) is provided with an inner hexagonal lace hole (21).

Preferably, the inner diameter of the distal end port of the implant (1) is equal to the inner diameter of the screw (2).

An implant sleeve in a vertebral body based on three-column fixation comprises an outer sleeve (31) and an inner rod (32), wherein the inner rod (32) can move in the outer sleeve (31), and an external thread (321) is arranged at one end of the inner rod (32).

Preferably, the external thread (321) is adapted to the first internal thread (11).

The working principle of the utility model is as follows:

the utility model makes the implant (1) and the screw (2) into an integrated vertebral body internal expansion device or a separated assembly type vertebral body internal expansion device, implants the implant (1) and the screw (2) into a target area in the vertebral body (5) by adopting the implantation sleeve (3), and supports the vertebral body (5) by expanding the implant (1) through the outer sleeve (31) and the inner rod (32) of the implantation sleeve (3); the backbone divide into fore-stock (half before the centrum), center pillar (half behind the centrum) and back post (pedicle of vertebral arch), and wherein implant (1) and screw (2) anterior segment part are used for supporting fore-stock and center pillar, realize the stability that centrum (5) are fixed promptly, and screw (2) latter half is used for supporting the back post, realizes the fixed stability of pedicle of vertebral arch (6) promptly to this realizes that three posts are fixed.

The utility model discloses include following step when using:

step one, establishing a working channel (4) to a fracture area through a bilateral or unilateral pedicle (6) channel;

step two, implanting the integrated intravertebral expansion device or the split-assembly type intravertebral expansion device with a proper size into a target area in a vertebral body (5) through the established working channel (4) by using the implantation sleeve (3), connecting an inner rod (32) of the implantation sleeve (3) with the far end of the implant (1), connecting an outer sleeve (31) of the implantation sleeve (3) with the near end of the implant (1) or the tail part of the screw (2), then pulling the inner rod (32) towards the near end of the implant (1) to expand the middle part of the implant (1) without moving the outer sleeve (31).

And step three, withdrawing the implantation sleeve, and for the assembled expansion device, inserting a guide wire along the working channel (4), and connecting the head of the screw (2) with a second thread (12) in the proximal end of the implant body (1) through guide of the guide wire.

And step four, finally injecting bone cement according to the requirement.

Compared with the prior art, the utility model produced beneficial effect:

1. the utility model discloses simple and easy, compare PKP PVP art commonly used, can resume and keep the centrum height at once in the art, and based on the fixed intravertebral expanding unit of three posts, with the help of the power of controlling of pedicle of vertebral arch, can further improve fixed stability, the reducible interior plant is not hard up to be shifted and is leaded to the incidence of operation failure.

2. The utility model discloses a titanium alloy material provides certain centrum holding power after the expansion, and elastic modulus is less than traditional PMMA bone cement. Provides conditions for the auxiliary combination of calcium sulfate, magnesium sulfate and the like which have biological activity but insufficient mechanical strength. Thereby avoiding the damage risk caused by PMMA polymerization heating and reducing the incidence rate of PMMA poisoning. Can also reduce the incidence of vertebral body re-fracture caused by PMMA high elastic modulus and stress concentration.

Drawings

FIG. 1 is a schematic structural view of the integrated expanding device of the present invention;

FIG. 2 is a cross-sectional view of the integrated stent of the present invention;

FIG. 3 is a schematic view of the expanded structure of the integrated stent of the present invention;

FIG. 4 is a schematic structural view of the split-type expanding device of the present invention;

FIG. 5 is a cross-sectional view of the breakaway dilation device of the present invention;

FIG. 6 is a schematic view of the expanded split-type stent of the present invention;

FIG. 7 is a schematic structural view of a hexagonal flower hole of the screw according to the present invention;

FIG. 8 is a schematic structural view of the implant cannula of the present invention;

FIG. 9 is a view showing the usage of the integrated dilating device and the implanting cannula of the present invention;

FIG. 10 is a view showing the use of the split-type stent and the implantation sheath according to the present invention;

FIG. 11 is a view showing the state of the integrated dilating device of the present invention implanted in the whole implant screw and the outer sleeve;

FIG. 12 is a state diagram of the integrated expanding device of the present invention when the inner rod is screwed in;

FIG. 13 is a view of the integrated stent of the present invention expanded after implantation;

FIG. 14 is a view showing the implanted state of the integrated stent of the present invention;

FIG. 15 is a view showing the state of the split-type stent of the present invention implanted in an implant and with an outer sleeve being added;

FIG. 16 is a view showing the state of the split-type stent of the present invention when the inner rod is screwed in;

FIG. 17 is a view of the separated type dilating device of the present invention expanded after implantation;

FIG. 18 is a view showing the state of the split type stent of the present invention with screws being screwed;

FIG. 19 is a view of the separated type dilating device of the present invention after being implanted;

reference numerals: 1-an implant; 11 — a first internal thread; 12 — a second internal thread; 2-screws; 21-hexagonal flower-edge holes; 3, implanting a sleeve; 31-outer sleeve; 32-inner rod; 4, a working channel; 5-vertebral body; 6-pedicle of vertebral arch.

Detailed Description

The following describes embodiments of the present invention in more detail with reference to the accompanying drawings and specific examples.

The specific implementation mode is as follows:

example 1

The specification and the attached drawings 1-7 show that the centrum internal expansion device based on three-column fixation comprises a slender implant body 1 with a hollow middle part and a screw 2 with a hollow inner part, wherein a first internal thread 11 is arranged in a distal end port of the implant body 1, and a proximal end port of the implant body 1 is connected with the head of the screw 2 into a whole.

Further, as shown in fig. 4-6 of the specification, the implant 1 and the screw 2 may be assembled separately by providing a second internal thread 12 in the proximal end port of the implant 1 that is adapted to the thread of the head of the screw 2.

Further, the middle part of the implant 1 is a net structure, holes with different shapes are formed by crossing, and the middle part of the implant 1 is expanded by reducing the distance between the far end and the near end of the implant 1, as shown in the attached figures 3 and 6 in the specification, the elongated implant 1 is expanded into a net-shaped implant 1 with supporting force.

Further, the thread from the head to the outer side of the tail of the screw 2 is sparse in front and dense in back, and as shown in the specification and figure 7, the tail of the screw 2 is provided with an inner hexagonal lace hole 21 for facilitating the threading of a guide wire.

Further, the inner diameter of the distal end port of the implant 1 is equal to the inner diameter of the screw 2.

Example 2

As shown in the specification and the attached figure 8, the implanting sleeve 3 comprises an outer sleeve 31 and an inner rod 32, wherein the inner rod 32 can move in the outer sleeve 31, and one end of the inner rod 32 is provided with an external thread 321.

Further, the external thread 321 is adapted to the first internal thread 11.

Example 3

A method for implanting a three-column fixation based interbody integrated augmentation device, comprising the steps of:

step one, establishing a working channel 4 to a fracture area through a bilateral or unilateral pedicle 6 channel;

step two, as shown in the attached drawings 11-14 of the specification, an integrated intravertebral expansion device with a proper size is implanted into a target area in a vertebral body 5 through an established working channel 4 by adopting an implantation sleeve 3, the implant 1 and the front half section of the screw 2 support the vertebral body 5, and the rear half section of the screw 2 holds the pedicle 6 of vertebral arch; as shown in the attached drawing 12 of the specification, the inner rod 32 of the implantation sleeve 3 is screwed in, the inner rod 32 passes through the inside of the screw 2 and passes through the implant 1, and is connected with the first internal thread 11 at the distal end of the implant 1 through the external thread 321, the outer sleeve 31 of the implantation sleeve 3 is connected with the tail part of the screw 2, then the outer sleeve 31 is fixed, as shown in the attached drawing 13 of the specification, the inner rod 32 is pulled towards the proximal direction of the implant 1, the middle part of the implant 1 is expanded, the vertebral body 5 is propped up, wherein the screw 2 with a slightly longer length can be selected, and the tail part of the screw 2 penetrates out of the pedicle 6, so that the implantation position can be conveniently found by a secondary operation.

And step three, as shown in the attached figure 14 of the specification, withdrawing the implantation sleeve 3, withdrawing the outer sleeve 31 and simultaneously screwing out the inner rod 32.

And step four, finally injecting bone cement according to the requirement.

Example 4

A method for implanting a three-post fixation based intravertebral distraction device, comprising the steps of:

step one, establishing a working channel 4 to a fracture area through a bilateral or unilateral pedicle 6 channel;

step two, as shown in the attached drawings 15-19 of the specification, the separated type vertebral body internal expansion device with a proper size is implanted into a target area in a vertebral body 5 through the built working channel 4 by adopting the implantation sleeve 3, as shown in the attached drawing 16 of the specification, the inner rod 32 of the implantation sleeve 3 is screwed in from the near end of the implant 1 to the far end of the implant 1 and is connected with the first internal thread 11 at the far end of the implant 1 through an external thread 321, the outer sleeve 31 of the implantation sleeve 3 is connected with the near end of the implant 2, then the outer sleeve 31 is fixed, as shown in the attached drawing 17 of the specification, the inner rod 32 is pulled towards the near end of the implant 1, the middle part of the implant 1 is expanded to support the vertebral body 5, the front half sections of the implant 1 and the screw 2 support the vertebral pedicle 5, and the rear half section of the screw 2 holds the vertebral pedicle 6;

and step three, withdrawing the implantation sleeve 3, withdrawing the outer sleeve 31, simultaneously screwing out the inner rod 32, then placing a guide wire along the working channel 4, guiding and screwing in the screw 2 through the guide wire, as shown in the figure 18 in the specification, the head of the screw 2 is connected with the second internal thread 12 at the near end of the implant 1, so that the screw 2 is fully connected with the near end of the implant 1, wherein the screw 2 with a slightly longer length can be selected, and the tail part of the screw 2 is exposed on the surface of a vertebral plate outside the pedicle 6, thereby facilitating the determination of the first implantation position by a secondary operation.

And step four, finally injecting bone cement according to the requirement.

The protection scope of the present invention is not limited to the above embodiments, but is only for the purpose of helping explain and explain the present invention, rather than limiting the protection scope of the present invention, as long as the design is the same as the present invention or as long as the design is equivalent to replace all fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides an expansion device in centrum based on three post are fixed, includes the slender type implant (1) of middle fretwork and inside hollow screw (2), its characterized in that: a first internal thread (11) is arranged in a far end port of the implant body (1), and a near end port of the implant body (1) is connected with the head of the screw (2) into a whole.

2. The intravertebral dilation device based on three post fixation of claim 1 wherein: the implant (1) and the screw (2) can also be assembled separately by providing a second internal thread (12) in the proximal end of the implant (1) that is adapted to the thread of the head of the screw (2).

3. The intravertebral dilation device based on three post fixation of claim 1 wherein: the middle part of the implant body (1) is of a net-shaped structure, holes with different shapes are formed in a crossed mode, the middle part of the implant body (1) is expanded by reducing the distance between the far end and the near end of the implant body (1), and the slender implant body (1) is expanded into the net-shaped implant body (1) with supporting force.

4. The intravertebral dilation device based on three post fixation of claim 1 wherein: the threads from the head of the screw (2) to the outer side of the tail of the screw are sparse in front and dense in back, and an inner hexagonal flower side hole (21) is formed in the tail of the screw (2).

5. The intravertebral dilation device based on three post fixation of claim 1 wherein: the inner diameter of the distal end port of the implant (1) is equal to the inner diameter of the screw (2).

6. A three-column fixation based intravertebral implantation sleeve for implanting the intravertebral expansion device of claim 1 into a vertebral body, wherein: the implantation sleeve (3) comprises an outer sleeve (31) and an inner rod (32), wherein the inner rod (32) can move in the outer sleeve (31), and one end of the inner rod (32) is provided with an external thread (321); the implant (1) and the screw (2) are implanted into a target area in the vertebral body (5) by adopting the implantation sleeve (3), and the implant (1) is expanded to support the vertebral body (5) through an outer sleeve (31) and an inner rod (32) of the implantation sleeve (3).

7. The intravertebral implant cannula based on three post fixation of claim 6, wherein: the external thread (321) is matched with the first internal thread (11).

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