Umbrella-shaped vertebral body forming spreader

Abstract

The invention discloses an umbrella-shaped vertebral body forming spreader which comprises a first supporting part, a sliding block, a spreading block and a driving piece. The sliding block is connected with the first supporting part, and a deformation cavity is formed between the sliding block and the first supporting part, so that the sliding block can contract in the direction close to the first supporting part; the distraction blocks are arranged on the two sides of the sliding block and connected with the sliding block and the end face of the first supporting part through deformation strips, and when the sliding block moves in the direction close to the first supporting part, the deformation strips deform, so that the distraction blocks expand in the direction away from the sliding block; when the opening block expands in the direction away from the sliding block, the opening block is in an inclined state. The driving piece is rotationally installed in the first supporting part, connected with the sliding block and used for controlling the sliding block to move in the direction close to the first supporting part. By means of the arrangement, the vertebral compression fracture distraction reduction and fixation functions can be achieved without depending on bone cement, and the application range is widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to an umbrella-shaped vertebral body forming and distracting device. BACKGROUND

[0002] Osteoporotic vertebral compression fractures are caused by osteoporosis, which leads to a decrease in bone density and bone mass of the vertebral body, and thus the fracture occurs under slight external force. According to literature reports, about 8.9 million fractures worldwide are related to osteoporosis every year, of which more than 50% occur in the vertebral body. With the increase of age, the incidence of vertebral compression fractures increases significantly. The incidence rate of 60 to 69 years old population is 22.6%, and the incidence rate of over 80 years old population is as high as 58.1%. Especially for women, after menopause, due to the decrease of female hormone level, the bone density decreases significantly, which leads to a substantial increase in the risk of fracture.

[0003] Moderate to severe osteoporotic vertebral compression fractures often require surgical treatment, and the treatment goals include restoring the height of the vertebral body, stabilizing the structure of the vertebral body, relieving clinical symptoms, and promoting early functional recovery. The current common surgical treatment methods include percutaneous vertebroplasty and percutaneous vertebral stent forming. Percutaneous vertebroplasty can effectively relieve pain after fracture and restore the height of the vertebral body and correct the kyphotic angle to some extent. However, the use of bone cement is accompanied by multiple risks. The leakage rate of traditional non-degradable bone cement (such as PMMA) is high, and the leakage rate in vertebroplasty can be as high as 87.5%, and the heat released during the solidification process is easy to cause thermal injury to the surrounding tissues. Although the degradable bone cement has good biocompatibility, its mechanical strength is low and its brittleness is high, and the degradation rate does not match the bone healing, which easily leads to support failure. In addition, the existing percutaneous vertebral stents generally adopt expandable mesh tube design, however, the distracting strength of these stents is limited, and it is difficult to withstand the compression load in the daily activities of the spine for a long time, and still needs to rely on bone cement to provide additional support. For patients who are allergic to bone cement, or patients who have posterior wall damage of the vertebral body and lead to high leakage risk, the application of such stents is limited to some extent.

[0004] Therefore, we designed an umbrella-shaped vertebral body forming and distracting device which can solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide an umbrella-shaped vertebral body forming and distracting device, which can realize the function of vertebral body stable support without relying on bone cement, and improve the application range.

[0006] To solve the above technical problems, the present application provides an umbrella-shaped vertebral body forming and distracting device, comprising a first support part, a sliding block, a distracting block and a driving part. The slider is connected with the first support part, and a deformation cavity is formed between the slider and the first support part, so that the slider can be contracted in the direction of approaching the first support part; The expansion block is arranged on both sides of the slider, and is connected with the slider and the end face of the first support part through a deformation strip. When the slider moves in the direction of approaching the first support part, the deformation strip deforms, so that the expansion block expands in the direction away from the slider; When the expansion block expands in the direction away from the slider, the expansion block is in an inclined state; The driving member is rotatably installed in the first support part and connected with the slider, and is used for controlling the slider to move in the direction of approaching the first support part.

[0007] Further, the included angle between the side end face of the expansion block away from the slider and the horizontal plane is 0°-12°.

[0008] Further, the length of the deformation strip between the expansion block and the slider is greater than the length of the deformation strip between the expansion block and the first support part.

[0009] Further, the driving member includes a rotating screw; The rotating screw is rotatably installed in the interior of the first support part, is threadedly connected with the slider, and is detachably connected with the first support part.

[0010] Further, when the expansion block is in the expanded state, one end of the rotating screw is exposed outside the slider; When the expansion block is in the contracted state, the rotating screw is hidden inside the slider.

[0011] Further, a second support part is further included; The second support part is detachably connected with one end of the first support part; The driving member further includes a rotating handle; The rotating handle has a spline shaft; One end of the spline shaft penetrates the second support part and the first support part in sequence, and is inserted with the end of the rotating screw.

[0012] Further, the spline shaft is arranged in a hexagonal structure, and one end of the rotating screw has a hexagonal hole matched with the spline shaft.

[0013] Further, the driving member further includes a sleeve assembly; The sleeve assembly is detachably connected with the second support part, and has a through hole in the interior for the spline shaft to penetrate.

[0014] Further, the sleeve assembly comprises a threaded outer sleeve and an inner sleeve; The outer sleeve is threaded with the second support part, and the outer wall has a symmetrically arranged hand-held protrusion; One end of the inner sleeve is threaded with the end of the first support part for limiting the first support part; The extension direction of the hand-held protrusion is parallel to the expansion direction of the expansion block.

[0015] Further, the deformation cavity and the sliding block are arranged in a T-shaped structure.

[0016] Compared with the prior art, the present application has at least the following beneficial effects: By connecting the first support part with the sliding block and forming a deformation cavity therebetween, the sliding block can be retracted in the direction close to the first support part, providing a structural basis for the deformation of the support; and by arranging the expansion block on both sides of the sliding block and connecting the deformation strip with the sliding block and the end face of the first support part, when the sliding block moves, the deformation strip can be deformed and drive the expansion block to expand in the direction away from the sliding block, and the expansion block expands in an inclined state, which can better fit the vertebral body to achieve the function of stable support; in addition, by arranging the driving member rotatingly installed in the first support part and connected with the sliding block, the driving member can directly control the movement of the sliding block, thereby adjusting the expansion degree of the expansion block. When expansion support is needed, only the operation of the driving member needs to be controlled, without the need for additional auxiliary materials such as bone cement, so compared with the way of relying on bone cement support or using a mesh tubular support with limited strength in the prior art, the bone cement related risks can be fundamentally avoided, and at the same time, the stable deformation and inclined expansion setting of the structure itself can provide more reliable and fitted support effect, and the operation is convenient and controllable, suitable for more clinical scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of the expansion block of the vertebral support deformation support in an embodiment of the present application when expanded; Figure 2 FIG. 2 is a partial structural schematic view of the expansion block of the vertebral support deformation support in an embodiment of the present application when expanded; Figure 3 FIG. 3 is a partial structural schematic view of the expansion block of the vertebral support deformation support in an embodiment of the present application when retracted; Figure 4 FIG. 4 is a partial sectional view of the expansion block of the vertebral support deformation support in an embodiment of the present application when retracted; Figure 5 FIG. 5 is a partial sectional view of the driving member of the vertebral support deformation support in an embodiment of the present application.

[0018] Fig. 1 is a first support part; 11 is a deformation cavity; 2 is a second support part; 3 is a sliding block; 4 is a distraction block; 41 is a deformation strip; 5 is a rotating screw; 6 is a rotating handle; 61 is a spline shaft; 7 is a sleeve assembly; 71 is a hand-held protrusion. DETAILED DESCRIPTION

[0019] The umbrella-shaped vertebral body shaping and distracting device will be described in more detail below with reference to the accompanying drawings, in which the preferred embodiments of the present application are shown, and it should be understood that those skilled in the art can modify the present application described herein while still achieving the advantageous effects of the present application. Therefore, the following description should be understood as a broad knowledge to those skilled in the art, and not as a limitation of the present application.

[0020] Moreover, those skilled in the art can form new technical solutions by cross-combining different embodiments based on the inspiration of the present specification without causing technical contradictions, and such variations should be considered to fall within the protection scope of the present patent.

[0021] The present application will be described in more detail below with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present application will be more apparent from the following description. It should be noted that the drawings are all greatly simplified and use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application.

[0022] As shown in Figures 1 to 5 the present embodiment proposes an umbrella-shaped vertebral body shaping and distracting device, which comprises a first support part 1, a sliding block 3, a distraction block 4 and a driving member.

[0023] The sliding block 3 is connected with the first support part 1, and a deformation cavity 11 is formed between the sliding block 3 and the first support part 1, so that the sliding block 3 can be contracted in the direction of approaching the first support part 1.

[0024] The distraction block 4 is arranged on both sides of the sliding block 3, and is connected with the end face of the sliding block 3 and the first support part 1 through a deformation strip 41. When the sliding block 3 moves in the direction of approaching the first support part 1, the deformation strip 41 deforms, so that the distraction block 4 expands in the direction of moving away from the sliding block 3.

[0025] When the distraction block 4 expands in the direction of moving away from the sliding block 3, the distraction block 4 is in an inclined state, so as to better adapt to the structure of the vertebral body and improve the stability of the support.

[0026] The driving member is rotatably installed in the first support part 1 and connected with the sliding block 3, for controlling the sliding block 3 to move in the direction of approaching the first support part 1.

[0027] The device is connected with the first supporting part 1 and the sliding block 3, and a deformation cavity 11 is formed between the two, so that the sliding block 3 can be contracted in the direction close to the first supporting part 1, and a structural basis for the deformation of the support is provided.

[0028] Further, the support block 4 is located on both sides of the sliding block 3, and the deformation strip 41 is connected with the sliding block 3 and the end face of the first supporting part 1, so that when the sliding block 3 moves, the deformation strip 41 can be deformed and drive the support block 4 to expand in the direction away from the sliding block 3, and the support block 4 is in an inclined state when it expands, so that it can better fit the vertebral body to realize the function of stable support.

[0029] In addition, the driving member is rotatably installed in the first supporting part 1 and connected with the sliding block 3, so that the driving member can directly control the movement of the sliding block 3, thereby controlling the expansion degree of the support block 4.

[0030] Therefore, when expansion support is needed, only the driving member needs to be controlled to operate, without the need for additional auxiliary materials such as bone cement, so compared with the existing technology which relies on bone cement support or uses a mesh tubular support with limited strength, the bone cement related risks can be fundamentally avoided, and a more reliable and fitted support effect can be provided by virtue of the stable deformation and inclined expansion of the structure, and the operation is convenient and controllable, which is suitable for more clinical scenes.

[0031] In the embodiment, the sliding block 3, the support block 4 and the first supporting part 1 are connected by the deformation strip 41 to form a whole structure, so that the number of whole component assemblies is reduced, and the assembly difficulty is effectively reduced.

[0032] It should be noted that since the vertebral body itself has a certain physiological curvature, the inclination angle of the support block 4 is further limited to be able to match the natural shape of the vertebral body, so that the support block 4 can more closely fit the inner wall of the vertebral body after expansion, avoiding local gaps or excessive extrusion caused by improper angle, and improving the fitting degree of support.

[0033] Specifically, the included angle between the end face of the support block 4 away from the sliding block 3 and the horizontal plane is 0°-12°. The specific inclination angle of the support block 4 is controlled by the moving distance of the sliding block 3, so that the size of the included angle can be adjusted according to the treatment condition of different patients, and the bone fracture reduction and anatomical repair of the patient can be better realized.

[0034] In the embodiment, in order to make the sliding block 3 move better and form an included angle (i.e. in an inclined state) with the support block 4, the size of the deformation strip 41 is further limited.

[0035] Specifically, the length of the deformation strip 41 between the expansion block 4 and the sliding block 3 is greater than the length of the deformation strip 41 between the expansion block 4 and the first support part 1. The function of the expansion block 4 forming an included angle is realized by the different displacement amounts of the deformation strips 41 with different lengths during deformation, that is, the stretching or bending degree of the long deformation strip 41 is greater, and the short deformation strip 41 is relatively stable, so when the sliding block 3 moves, the expansion block 4 can naturally form an inclined angle (0°-12°) conforming to the physiological structure of the vertebral body, ensure the fit of the expansion block 4 and the vertebral body, and improve the adaptability of the support.

[0036] In further embodiments, a specific driving member is also proposed to better complete the movement control of the sliding block 3.

[0037] The driving member includes a rotating screw 5, which is rotatably installed in the inside of the first support part 1, is in threaded connection with the sliding block 3, and is detachably connected with the first support part 1. That is, through the limiting action of the threads, the deformation strip 41 and the deformation cavity 11, when the rotating screw 5 rotates, the sliding block 3 can move in a predetermined direction, realizing the expansion or contraction of the expansion block 4.

[0038] Among them, the deformation cavity 11 and the sliding block 3 are arranged in a T-shaped structure, that is, through the plug-in design between the deformation cavity 11 and the sliding block 3, the guiding and limiting effects are achieved, so that the sliding block 3 only moves along a predetermined track, so that the expansion block 4 can accurately expand or contract when applied.

[0039] In addition, it also needs to be explained that when the expansion block 4 is in the expanded state, one end of the rotating screw 5 is exposed to the outside of the sliding block 3, and when the expansion block 4 is in the contracted state, the rotating screw 5 is hidden in the inside of the sliding block 3.

[0040] The exposure and hiding of the rotating screw 5 can be used as a visual identifier of the state of the expansion block 4, and medical personnel can quickly judge the expansion degree of the expansion block by observing whether the screw is exposed or not during the operation, without the need for additional instrument detection, simplifying the state confirmation process in the operation and improving the operation efficiency.

[0041] In other embodiments, the rotating screw 5 can always be hidden in the inside of the sliding block 3 (that is, the rotating screw 5 is hidden in the sliding block 3 when the expansion block 4 expands or contracts), to prevent the end of the rotating screw 5 from being exposed and touching the surrounding tissues of the patient's affected area.

[0042] In other embodiments, in order to facilitate the rotation of the rotating screw 5, a second support part 2 and a further limitation of the driving member are also added.

[0043] Specifically, the deformation support for supporting the vertebral body further comprises a second support part 2, which is detachably connected with one end of the first support part 1. The detachable connection between the second support part 2 and the first support part 1 enables the support to be flexibly assembled or disassembled according to the surgical requirements, facilitating preoperative sterilization, intraoperative adjustment and postoperative maintenance, and being able to adapt to different specifications of auxiliary components, thereby improving the universality of the overall structure.

[0044] The driving member further comprises a rotating handle 6, which has a spline shaft 61.

[0045] One end of the spline shaft 61 penetrates the second support part 2 and the first support part 1 in sequence and is inserted with the end of the rotating screw 5. That is, the spline shaft 61 is arranged as a power transmission connecting piece, so that when the expansion block 4 is placed in the patient's body, the medical staff can quickly control the expansion of the expansion block 4 outside the body to form a reliable support structure for the patient's vertebral body.

[0046] The spline shaft 61 is arranged in a hexagonal structure, and one end of the rotating screw 5 has a hexagonal hole matched with the spline shaft 61. The spline shaft 61 and the rotating screw 5 can be relatively fixed in the direction of the axis to rotate synchronously and complete force transmission.

[0047] As shown in Figure 1 and Figure 5 In other embodiments, the driving member further comprises a sleeve assembly 7.

[0048] The sleeve assembly 7 is detachably connected with the second support part 2 and has a through hole inside for the spline shaft 61 to penetrate, so that the spline shaft 61 can be separated from the sleeve assembly 7 along the length direction, facilitating sterilization operation after use.

[0049] It should be noted that in order to modularize the components to be connected together, the sleeve assembly 7 is further defined.

[0050] The sleeve assembly 7 comprises a threaded outer sleeve and an inner sleeve.

[0051] The outer sleeve is threadedly connected with the second support part 2, and the outer wall has symmetrically arranged hand holding protrusions 71.

[0052] It should be noted that the extension direction of the hand holding protrusions 71 is parallel to the expansion direction of the expansion block 4, that is, by arranging the extension direction of the hand holding protrusions 71 to be parallel to the expansion direction of the expansion block 4, the medical staff can still clearly know the expansion direction of the expansion block 4 when it is subjected to the force of the slider 3 when the expansion block 4 is located in the patient's body, achieving the purpose of facilitating the operation of the medical staff.

[0053] One end of the inner sleeve is threadedly connected with the end of the first supporting part 1 for limiting the first supporting part 1. That is, since the outer sleeve is threadedly connected with the second supporting part 2, the outer sleeve is threadedly connected with the inner sleeve, and the inner sleeve is threadedly connected with the first supporting part 1, the end of the first supporting part 1 is kept relatively fixed in the second supporting part 2.

[0054] It should be particularly pointed out that the first supporting part 1 and the second supporting part 2 are connected in a sliding insertion mode, and the first supporting part 1 has a half-spherical protrusion at one end thereof for being clamped in the second supporting part 2, so that when the inner sleeve is threadedly connected with the first supporting part 1, the first supporting part 1 can be kept fixed with the second supporting part 2.

[0055] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover the modifications and changes as long as they come within the scope of the appended claims and their equivalents.

Claims

1. A type of umbrella-shaped cone-shaped expander, characterized in that, Includes a first support, a slider, a spreading block, and a driving component; The slider is connected to the first support portion, and a deformable cavity is formed between the slider and the first support portion, so that the slider can contract in the direction close to the first support portion; The expansion block is disposed on both sides of the slider and is connected to the end face of the slider and the first support part through a deformation strip. When the slider moves in the direction close to the first support part, the deformation strip deforms, causing the expansion block to expand in the direction away from the slider. Wherein, when the expanding block expands in a direction away from the slider, the expanding block is in an inclined state; The drive component is rotatably mounted inside the first support portion and connected to the slider, and is used to control the slider to move in a direction close to the first support portion.

2. The umbrella-shaped cone-shaped expander as described in claim 1, characterized in that, The angle between the end face of the supporting block away from the slider and the horizontal plane is 0°-12°.

3. The umbrella-shaped cone-shaped expander as described in claim 1 or 2, characterized in that, The length of the deformation strip between the supporting block and the slider is greater than the length of the deformation strip between the supporting block and the first support portion.

4. The umbrella-shaped cone-shaped expander as described in claim 1, characterized in that, The driving component includes a rotating screw; The rotating screw is rotatably installed inside the first support part and is threadedly connected to the slider, and is detachably connected to the first support part.

5. The umbrella-shaped cone-shaped expander as described in claim 4, characterized in that, When the expansion block is in the expanded state, one end of the rotating screw is exposed to the outside of the slider; When the expanding block is in the retracted state, the rotating screw is hidden inside the slider.

6. The umbrella-shaped cone-shaped expander as described in claim 4, characterized in that, It also includes a second support section; The second support portion is detachably connected to one end of the first support portion; The driving component also includes a rotating handle; The rotating handle has a splined shaft; One end of the spline shaft passes through the second support portion and the first support portion in sequence, and is inserted into the end of the rotating screw.

7. The umbrella-shaped cone-shaped expander as described in claim 6, characterized in that, The spline shaft is configured with a hexagonal structure, and one end of the rotating screw has a hexagonal hole that matches the spline shaft.

8. The umbrella-shaped cone-shaped expander as described in claim 6, characterized in that, The drive component also includes a sleeve assembly; The sleeve assembly is detachably connected to the second support portion and has a through hole for the spline shaft to pass through.

9. The umbrella-shaped cone-shaped expander as described in claim 8, characterized in that, The sleeve assembly includes a threaded outer sleeve and an inner sleeve; The outer sleeve is threadedly connected to the second support part, and the outer wall has symmetrically arranged hand-held protrusions; One end of the inner sleeve is threaded to the end of the first support part, which is used to limit the first support part; The extension direction of the hand-held protrusion is parallel to the expansion direction of the spreading block.

10. The umbrella-shaped cone-shaped expander as described in claim 1, characterized in that, The deformation cavity and the slider are configured as a T-shaped structure.

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