CN2891990Y

CN2891990Y - Dilator for forming cavity in centrum

Info

Publication number: CN2891990Y
Application number: CN 200520037723
Authority: CN
Inventors: 邹德威
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-28
Filing date: 2005-12-28
Publication date: 2007-04-25
Anticipated expiration: 2015-12-28

Abstract

The utility model relates to a kind of expander used in empty cavity formed in the vertebral body, including a hollow outer tube and an inner core arranged through the hollow outer tube; one end of the outer tube is fixed with the inner core, while the other end is actively sleeved; the outer tube has a elastic expanding section formed by the two or more than two pieces of openings strips; at least the elastic expanding section is covered with the elastic covering film. The use of the expander of the utility model can compress the cancellous bone seamlessly and completely to the upper and lower end plates and the surrounding bone cortex, when the device is expanding; the device can improve the densification of the vertebral body and raise the effects of the operative treatment of the compression fractures of the spine caused by the osteoporosis.

Description

Be used for forming the dilator of cavity vertebral body

Technical field

This utility model relates to a kind of medical apparatus that is used for spinal treatments, is a kind of dilator that is used for forming vertebral body cavity specifically.

Background technology

The compression fracture of spine that is caused by osteoporosis, difficulty is very big in treatment.The patient is usually owing to pain, can not stand, and the long-term bed of having to, and effective treatment means for want of, and causes quality of life sharply to descend, and causes various complication.

For effectively treating this compression fracture of spine, obtained satisfied early efficacy by the operation that utilizes dilator that vertebral body is expanded the protruding shaping in back at present.For example, WO 2005/011507 patent disclosure a kind of dilator that is used for forming cavity vertebral body.Shown in Fig. 1-2, this dilator comprises a hollow outer pipe 91 and is placed through interior pipe 92 in this hollow outer pipe 91, this two Guan Yuyi end is fixing, and outer tube 91 is provided with elastic dilatation section 93 in the position of this two pipes stiff end, the end in addition of two pipes then is slidingly connected, and this elastic dilatation section 93 is that the tear strip 931 that is provided with more than two or two on a section of outward appearance forms.In use, this dilator is inserted in conduit, producing to axial the position by the end that is slidingly connected at interior pipe 92 and 91 of outer tubes moves, make the elastic dilatation section 93 of outer tube 91 extend out formation cavity (as shown in Figure 2), the axial location of interior pipe 92 of the sheathed end that reactivates at this moment and outer tube 92, this elastic dilatation section 93 can be withdrawn as shown in Figure 1, and takes out from conduit, inject bone cement in the cavity that in vertebral body, forms then so that it forms a foundry goods in cavity, promptly finished operation.Utilize this dilator can when expansion will fracture because of osteoporosis the spongy bone that subsides be squeezed to vertebral body soleplate up and down and around cortical bone, and the height and the shape of hindering vertebra are recovered by in cavity, injecting bone cement.

But, above-mentioned dilator also has following defective in use: because the elastic dilatation section 93 on this dilator outer tube 91 is to be formed by tear strip, it changes and the next cavity that forms in vertebral body of oppressed distortion expansion by the axial location of outer tube 91 with interior pipe 92, as shown in Figure 2, this tear strip 931 is when opening, the osteoporosis spongy bone slag that subsides of fracturing has bigger space between the adjacent apertures bar 931, because of can fall in the cavity by this space; In addition, owing to have bigger space between the tear strip 931, for forming complete cavity, need constantly to rotate this dilator, this tear strip edge can produce the cutting and crushing effect to its spongy bone that touches when rotating, more spongy bone slag is dropped in the cavity, rather than evenly be expressed to the soleplate up and down of vertebral body, cause the compactness of vertebral body and cavity wall poor, thereby surgical result is produced adverse influence.

Therefore, be necessary to provide a kind of novel dilator that is used for forming cavity, overcome the defective that above-mentioned existing dilator exists vertebral body.

Summary of the invention

Technical problem to be solved in the utility model is, a kind of dilator that is used for forming vertebral body cavity is provided, and can spongy bone be squeezed to soleplate up and down and the cortical bone on every side of vertebral body when expansion, improves the compactness of vertebral body, improves surgical effect.

Above-mentioned technical problem of the present utility model can adopt following technical scheme to solve, a kind of dilator that is used for forming cavity vertebral body, comprise a hollow outer pipe and be placed through the interior inner core of this hollow outer pipe, this outer tube and inner core are at one end fixing then to be slidingly connected in the other end, and be formed with the elastic dilatation section that constitutes by the tear strip more than two or two on the outer tube, outside described elastic dilatation section, be covered with the elasticity overlay film at least.

As a concrete example, described elasticity overlay film can be the cryptomere with an opening, and this cryptomere elasticity overlay film is fixed in outside the elastic dilatation section from the stiff end of outer tube and inner core is sheathed.

As the selectable example of another one, described elasticity overlay film also can be the tubulose with two openings, and tubulose elasticity overlay film is sheathed is fixed in outside the elastic dilatation section for this, and this elastic dilatation section is coated on wherein.

In this utility model, described elasticity overlay film is adhered to outside the described elastic dilatation section.

In this utility model, described inner core can convexedly stretch in certain-length outside the hollow outer pipe and form holding end at the end that is slidingly connected.Can be further be provided with external screw thread, and on this external screw thread, be bolted with adjusting nut, thereby can force outer tube to move axially, the elastic dilatation section on the outer tube is expanded by this adjusting nut of turn with respect to inner core at the holding end of inner core.This adjusting nut can be adjusted axially relatively moving of this outer tube and inner core on the one hand, after adjustment is finished, also can play the positioning action that prevents that outer tube and inner core from moving to axial on the other hand.

In this utility model, the graduation mark of the volume after the end that is slidingly connected of outer tube and inner core can be provided with the expansion of elasticity of response expansion segment.

Adopt said structure of the present utility model, in use, this dilator is inserted in conduit, producing to axial the position by the end that is slidingly connected between inner core and outer tube moves, make the elastic dilatation section of outer tube extend out and strut the elasticity overlay film that its outside covers, will because of osteoporosis fracture the spongy bone that subsides evenly be squeezed to vertebral body soleplate up and down and around cortical bone, and form cavity.Dilator of the present utility model is because in process of expansion, the tear strip of this formation elastic dilatation section is covered with the elasticity overlay film outward, producing the gap in tear strip expansion back is covered by the elasticity overlay film, thereby do not have the situation that the spongy bone slag falls in the cavity and take place, and the elasticity overlay film is strutted the spongy bone of back to contact with it in the tear strip expansion and is produced even squeezing action, and in vertebral body, form complete cavity, and need as existing dilator, not rotate, and the edge of tear strip is not because of being covered and can expose by the elasticity overlay film yet, thereby avoided tear strip edge cuts spongy bone to make it to fall into the situation generation of cavity, after in vertebral body, forming cavity like this, originally the spongy bone that occupied cavity is squeezed in the cavity wall fully, it is finer and close to make sclerotin, has greatly improved surgical result.

Description of drawings

The existing basic structure sketch map that is used for forming the dilator of cavity of Fig. 1 vertebral body;

The expansion state sketch map of the existing dilator of Fig. 2;

Fig. 3 basic structure sketch map that is used for forming the dilator of cavity of the present utility model vertebral body;

The partial sectional view of Fig. 4 Fig. 3;

The A-A cutaway view of Fig. 5 Fig. 3;

Fig. 6 dilator expansion state of the present utility model partial sectional view;

The B-B cutaway view of Fig. 7 Fig. 6;

A kind of enforcement structural representation of Fig. 8 this utility model;

The expansion state sketch map of Fig. 9 dilator of the present utility model in vertebral body.

The specific embodiment

Shown in Fig. 3-9, the dilator that is used for forming cavity of the present utility model vertebral body, comprise a hollow outer pipe 1 and be placed through inner core 2 in this hollow outer pipe 1, this outer tube 1 then is slidingly connected in the other end with inner core 2 is at one end fixing, and be formed with the elastic dilatation section 12 that constitutes by the tear strip more than two or two 11 on the outer tube 1, outside described elastic dilatation section 12, be covered with elasticity overlay film 3 at least.

In use, as shown in Figure 9, this dilator is inserted in conduit 4, producing to axial the position by the end that is slidingly connected at

inner core

2 and 1 of outer tube moves, make the elastic dilatation section 12 of outer tube 1 extend out and strut the elasticity overlay film 3 that its outside covers, will because of osteoporosis fracture the spongy bone that subsides evenly be squeezed to vertebral body soleplate up and down and around cortical bone, and form cavity.This utility model dilator is in above-mentioned process of expansion, owing to constitute the tear strip 11 outer elasticity overlay films 3 that are covered with of elastic dilatation section 12, producing the gap in tear strip 11 expansion backs is covered by elasticity overlay film 3, thereby do not have the situation that the spongy bone slag falls in the cavity and take place, and elasticity overlay film 3 is strutted the spongy bone of back to contact with it in tear strip 11 expansions and is produced even squeezing action, and in vertebral body, form complete cavity, and need as existing dilator, not rotate, and the edge of tear strip 11 can not expose because of being covered by elasticity overlay film 3 yet, thereby avoided tear strip 11 edge cuts spongy bones to make it to fall into the situation generation of cavity, after in vertebral body, forming cavity like this, originally the spongy bone that occupied cavity is squeezed in the cavity wall fully, it is finer and close to make sclerotin, has greatly improved surgical result.

As a concrete example, shown in Fig. 3-9, described elasticity overlay film 3 can be the cryptomere with an opening, and this cryptomere elasticity overlay film 3 is from outer tube 1 sheathed being fixed in outside the elastic dilatation section 12 of stiff end with inner core 2, thereby elastic dilatation section 12 is coated on wherein.

As the selectable example of another one, described elasticity overlay film 3 also can be the tubulose with two openings, these tubulose elasticity overlay film 3 sheathed being fixed in outside the elastic dilatation section 12, and this elastic dilatation section 12 is coated on wherein, 3 liang of openings of this elasticity overlay film can be directly fixed on the outer wall of outer tube 1, move when avoiding strutting, not shown.

In this utility model, described elasticity overlay film 3 also can directly be adhered to outside the described elastic dilatation section 12.

In this utility model, the tear strip shape of elastic dilatation section 12, opening mode and outer tube 1 and inner core 2 all can adopt WO 2005/011507 patent described in the mode that is slidingly connected of the end that is slidingly connected etc., describe in detail no longer one by one at this.

As preferable specific embodiment, as shown in Figure 8, inner core 2 can convexedly stretch in hollow outer pipe 1 certain-length at the end that is slidingly connected and form holding end 21.Can be further be provided with external screw thread at the holding end 21 of inner core 2, and on this external screw thread, be bolted with adjusting nut 5, thereby can force outer tube 1 to move axially by this adjusting nut 5 of turn, make the elastic dilatation section 12 on the outer tube 1 expand or shrink with respect to inner core 2.This adjusting nut 5 can be adjusted axially relatively moving of this outer tube 1 and inner core 2 on the one hand, after adjustment is finished, also can play the positioning action that prevents that outer tube 1 and inner core 2 from moving to axial on the other hand, is convenient to operate when forming cavity and regulate.

As further improvement of the utility model, referring to shown in Figure 8, can be provided with the graduation mark 23 of reflection elastic dilatation section 12 volumes in the described end that is slidingly connected, in the present embodiment, this graduation mark 23 is established on the outer surface of holding end 21 of inner core 2, observed and recorded scale simultaneously when the turn helicitic texture.This graduation mark 23 can be arranged at any position of the end that is slidingly connected, and as described each position of WO 2005/011507 patent, as long as can react the volume that forms cavity, this utility model does not limit the position that is provided with of graduation mark 23.

Owing to be provided with graduation mark 23, and adopted the axial relative displacement of 5 pairs of outer tubes 1 of adjusting nut and inner core 2 to regulate at the described end that is slidingly connected, so not only can grasp cavity volume more intuitively, be convenient to hold the injection rate of bone cement, and can control cavity volume from the degree of accuracy of fine setting by turn adjusting nut 5, also because tear strip 11 has certain rigid, make that the shape of cavity is fixed basically, if change the opening length of tear strip 11, the elasticity distribution state, just can control cavity shape and volume artificially, therefore, also be convenient to the injection rate that the doctor grasps the sclerotin implant, can reduce operating difficulty to a certain extent.

This utility model outer tube 1 can adopt multiple materials such as macromolecular material or metal to make with inner core 2, in operation, can produce radiography clearly, can be widely used in the medical domain of multiple needs formation cavity, and the plastics in the employing macromolecular material or plastic cement mixture or resin, not only has elastic deformation characteristic preferably, cost is also lower

The foregoing description is several specific embodiment of the present utility model, only is used to illustrate this utility model, but not is used to limit this utility model.

Claims

1, a kind of dilator that is used for forming cavity vertebral body, comprise a hollow outer pipe and be placed through the interior inner core of this hollow outer pipe, this outer tube and inner core are at one end fixing then to be slidingly connected in the other end, and be formed with the elastic dilatation section that constitutes by the tear strip more than two or two on the outer tube, it is characterized in that, outside described elastic dilatation section, be covered with the elasticity overlay film at least.

2, the dilator that is used for forming vertebral body cavity as claimed in claim 1 is characterized in that described elasticity overlay film is the cryptomere with an opening, and this cryptomere elasticity overlay film is fixed in outside the elastic dilatation section from the stiff end of outer tube and inner core is sheathed.

3, the dilator that is used for forming vertebral body cavity as claimed in claim 1 is characterized in that described elasticity overlay film is the tubulose with two openings, and tubulose elasticity overlay film is sheathed is fixed in outside the elastic dilatation section for this.

4, the dilator that is used for forming vertebral body cavity as claimed in claim 1 is characterized in that described elasticity overlay film is adhered to outside the described elastic dilatation section.

As the described dilator that is used for forming cavity of the arbitrary claim of claim 1-4, it is characterized in that 5, described inner core convexedly stretches in certain-length outside the hollow outer pipe and forms holding end at the end that is slidingly connected vertebral body.

6, the dilator that is used for forming vertebral body cavity as claimed in claim 5 is characterized in that, is provided with external screw thread at the holding end of inner core, and is bolted with adjusting nut on this external screw thread.

7, the dilator that is used for forming vertebral body cavity as claimed in claim 1 is characterized in that, the graduation mark of the volume after the end that is slidingly connected of described outer tube and inner core is provided with the expansion of elasticity of response expansion segment.