CN114569225A

CN114569225A - Bone filling bag

Info

Publication number: CN114569225A
Application number: CN202011390453.1A
Authority: CN
Inventors: 邓向军; 王筱凡; 宋月华; 宋志伟
Original assignee: Shanghai Kinetic Medical Co Ltd
Current assignee: Shanghai Kinetic Medical Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2022-06-03

Abstract

The invention discloses a bone filling bag which comprises a bag body, an inner tube and an outer tube, wherein the opening end of the bag body is the tail end of the bag body, the other end of the bag body is the head end of the bag body, the tail end of the bag body is sleeved on the inner tube, the outer tube is sleeved on the bag body, the bag body is clamped between a gap between the inner tube and the front end of the outer tube to lock the tail end of the bag body, and one end of the inner tube is communicated with the bag body; the inner tube is axially movable relative to the outer tube; further comprising a support member supporting the pouch head end; the support is a part of the inner tube, or the support is a separate component; the support is axially movable relative to the outer tube. The length of the sac is adjusted by the axial movement of the inner tube and the outer tube.

Description

Bone filling bag

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a bone filling capsular bag.

Background

At present, the methods generally applied to osteoporotic vertebral compression fracture include percutaneous vertebroplasty and percutaneous kyphoplasty, wherein the percutaneous vertebroplasty is widely applied. Through injecting bone cement in order to increase centrum intensity and stability into the centrum, have that the wound is little, the effectual advantage of relieving pain, generally adopt earlier use the sacculus inflation in order to form the cavity after, the bone cement of reperfusion, and reach the effect that the bone cement was perfused to the low pressure, finally realize the reduction of bone cement leakage rate. However, in the operation, the bone filler is injected into the affected vertebra by means of percutaneous puncture, and a series of complications related to the injection of the bone filler, such as bone cement leakage, are easily accompanied in the operation. So can use bone filling bag to prevent bone cement seepage in the doctor of partial treatment operation, through filling bone cement in the bag in toward the vertebra body to the realization is raised the centrum that sinks, is increased centrum intensity, is alleviated painful, and the polymer network layer structure that the bag is fine and close can wrap up the bone cement of the overwhelming part, reduces bone cement's leakage rate.

At present, the length of the capsular bag is fixed, because the size of the vertebral body is different from the puncture angle, the size of the capsular bag needs to be selected according to clinical practice before implantation, the capsular bag can not be adjusted, and a small capsular bag for a large vertebral body and a large capsular bag for a small vertebral body are easy to appear.

Disclosure of Invention

The invention provides a bone filling capsular bag, which realizes the adjustment of the length of the capsular bag through the axial movement of a support piece.

The technical scheme of the invention is as follows:

a bone filling bag comprises a bag, an inner tube and an outer tube, wherein the opening end of the bag is a bag tail end, the other end of the bag is a bag head end, the bag tail end is sleeved on the inner tube, the outer tube is sleeved on the bag, the bag is clamped between a gap between the inner tube and the outer tube, the bag tail end is locked, and one end of the inner tube is communicated with the bag;

the inner tube is axially movable relative to the outer tube;

further comprising a support supporting the pouch head end; the support is a portion of the inner tube or the support is a separate component.

Preferably, the inner tube is sleeved with the outer tube, and the inner tube moves axially relative to the outer tube. Preferably, the socket joint is a threaded socket joint; or the sleeve joint is a sliding sleeve joint or a bayonet sleeve joint.

Preferably, the inner tube and the outer tube are connected through an electric push rod to realize axial movement and positioning.

Preferably, the inner tube or the outer tube is provided with scale marks for displaying the axial movement distance.

Preferably, the inner tube extends no further than the head end of the balloon, the inner tube being free of contact, contacting or connecting with the head end of the balloon.

Preferably, the inner tube extends to the balloon head end, the inner tube being in direct contact with the balloon head end.

Preferably, the head end of the capsular bag is thickened or multilayered.

Preferably, when the inner tube is not in contact with the head end of the capsular bag, the inner tube further comprises a needle core, and one end of the needle core penetrates through the inner tube to be connected or in contact with the head end of the capsular bag.

Preferably, when the inner tube is connected with the head end of the bag, or when the stylet is connected with or in contact with the head end of the bag, the head end of the bag is provided with a head end fixing piece which is connected with the head end of the bag, and the inner tube or the stylet supports the head end of the bag through the head end fixing piece.

Preferably, the head end fixing part is a locking part and comprises a shaft part and a ring part, the bag at the head end of the bag covers the shaft part, and the ring part is sleeved on the shaft part to clamp the bag between the shaft part and the ring part.

Preferably, the outer surface of the shaft and the inner surface of the ring are provided with structures for increasing friction force.

Preferably, the shaft member is of a cap rod structure and comprises a cap part and a rod part, the rod part is matched with the ring member to clamp the bag, and the cap part limits the ring member to prevent the ring member from being separated.

Preferably, a groove is formed in the matching part of the rod part and the ring part, and the metal shaft part is clamped in the groove.

Preferably, the ring member is a cap member, the shaft member is a rod member, and the cap member is sleeved on the end of the rod member to lock the bag between the cap member and the rod member.

Preferably, the inner tube is releasably connected to the head end of the bladder.

Preferably, the detachable connection comprises a break-off connection and a quick-release connection.

Preferably, when the head end fixing part is connected with the inner pipe in a breaking manner, a self-breaking groove is formed in the inner pipe close to the head end fixing part, or a self-breaking groove is formed in the head end fixing part close to the inner pipe.

Preferably, the side wall of the inner tube is provided with a plurality of openings communicated with the bag; the opening is arranged axially along the inner tube and/or the opening is arranged radially along the inner tube.

Preferably, the radius of the front ends of the inner tube and the outer tube is contracted to reduce the gap and lock the tail end of the balloon, and an anti-drop structure is arranged at the contracted part of the radius of the front ends of the inner tube and the outer tube to increase the friction force of the contact surfaces of the inner tube and the outer tube and prevent the inner tube and the outer tube from being separated in the process of injecting the bone filling material.

Preferably, the anti-dropping structure is a ring groove or rough sand blasting.

Compared with the prior art, the invention has the following beneficial effects:

firstly, the bag supporting piece is designed, the head end of the bag is pushed to move through the axial movement of the supporting piece, the length of the bag can be adjusted, the product specification and the using amount of bone cement can be increased according to requirements during use, and social resource waste and economic loss of patients are avoided after wrong specifications are used; the operation flow of the doctor is simplified; multi-specification standby libraries of hospitals, dealers and manufacturers are avoided, and social cost is saved;

secondly, the inner tube is extended to the head end of the bag, the inner tube is used as a supporting piece, the needle core can be omitted, the extension of the inner tube replaces the needle core to support the bag, the structure is simple, and the cost is reduced; in addition, when the inner tube is supported, the head end fixing piece at the front end of the sac can be omitted.

Thirdly, the fixing tube is lengthened, the opening of the inner tube is designed, and the molding state of the bone cement filled with the bag is influenced by controlling the pouring direction and form of the bone cement;

fourthly, the bearing capacity of the head end of the bag is improved by designing the fixing piece of the head end of the bag;

fifthly, the head and the tail of the inner tube bag can be developed through the design of the developing piece. Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic view of a bone-filling capsular bag according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure at A in FIG. 1 according to the present invention;

fig. 3 is a schematic view of a head end of a pouch according to a second embodiment of the present invention;

FIG. 4 is a schematic view of the internal structure of a pouch according to a third embodiment of the present invention;

FIG. 5 is a schematic view of a fourth embodiment of the present invention illustrating a bone-filling capsular bag;

FIG. 6 is a schematic view of a fifth embodiment of the present invention showing a bone-filling capsular bag;

FIG. 7 is a schematic view of the internal structure of a pouch according to a sixth embodiment of the present invention;

FIG. 8 is a schematic view of the internal structure of a pouch according to a seventh embodiment of the present invention;

fig. 9 is a schematic view of the internal structure of a pouch according to an eighth embodiment of the present invention;

FIG. 10 is a partial cross-sectional view of the inner tube extension tube engaging with the outer tube extension tube latch according to the ninth embodiment of the present invention;

fig. 11 is a schematic view of a bone-filling capsular bag according to a tenth embodiment of the present invention.

Detailed Description

The invention is further illustrated with reference to the following figures and specific examples. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In practice, the invention will be understood to cover all modifications and variations of this invention provided they come within the scope of the appended claims.

The bone filling balloon according to the first embodiment, as shown in fig. 1 and 2, includes a balloon 6, an inner tube 4, and an outer tube 8, the open end of the balloon is a balloon tail end 61, the other end is a balloon head end 62, the balloon tail end 61 is sleeved on the inner tube 4, the outer tube 8 is sleeved on the balloon 6, the balloon 6 is clamped between the gaps between the inner tube 4 and the outer tube 8, the balloon tail end 61 is locked, and one end of the inner tube 4 is communicated with the balloon 6; the inner tube is axially movable relative to the outer tube; further comprising a support member supporting the bladder; the support member is a part of the inner tube or the outer tube, as shown in fig. 7 and 8, the support member is the inner tube, or the support member is an independent component, as shown in fig. 1, the support member is the stylet 1. In the present embodiment, the inner tube 4 and the front end of the outer tube 8 move relatively to each other by the axial movement of the inner tube and the outer tube, so that the exposed length of the capsular bag is changed, and the length of the capsular bag is adjusted.

This embodiment provides a further improvement to the control end of the sachet so that the length of the sachet can be adjusted.

The length of the capsular bag is fixed, but the length of the exposed channel is the real effective length of the capsular bag. Typically we choose the exposed segment length to be 15,20,25,30,35,40 etc. But the control end is adjusted, i.e. the inner tube 4 and the outer tube 8 are moved axially, so that the exposed length of the capsular bag is controlled by the control end.

The axial movement of the inner tube 4 and the outer tube 8 can be controlled manually, for example, the inner tube 4 is sleeved with the outer tube 8, the sleeving can be performed by directly sleeving the inner tube 4 and the outer tube 8 with the inner tube or after the inner tube and the outer tube are extended or sleeving the inner tube and the outer tube through an external connecting piece, the inner tube moves axially relative to the outer tube, and the axial positioning structure is further included, and the inner tube and the outer tube are axially fixed; the axial movement of the inner tube 4 and the outer tube 8 may also be controlled electrically, as shown in fig. 11, by which the inner tube and the outer tube are connected by an electric push rod, by which the axial movement and positioning is controlled.

As shown in fig. 6, in a direction away from the bladder, the inner tube 4 and the outer tube 8 are telescoped such that the inner tube moves axially relative to the outer tube. The inner tube is sleeved with the outer tube, the inner tube 4 may be provided with an inner tube extension tube 40, the outer tube 8 is provided with an outer tube extension tube 80, for example, the outer tube extension tube 80 in fig. 6 is sleeved outside the inner tube extension tube 40, in other embodiments, the inner tube extension tube 40 may be sleeved outside the outer tube extension tube 80, and of course, the outer tube may be directly sleeved outside the inner tube. Of course, other suitable structures can be adopted to sleeve the inner pipe and the outer pipe.

The inner tube 4 with the 8 cup joints of outer tube department still is provided with the axial setting element to can stop fixed after controlling

inner tube

4, 8 axial displacement of outer tube, can control even

inner tube

4, 8 relative displacement of outer tube. For the convenience of illustration and description of the axial movement and positioning of the inner and outer tubes, the inner tube extension tube 40 and the outer tube extension tube 80 are sleeved together for illustration.

For example, inner tube extension pipe 40 and outer tube extension pipe 80 can be threaded connection, realize axial displacement and axial positioning through the screw-thread fit, also can realize the control of displacement volume, if outer tube extension pipe 80 overlaps when inner tube extension pipe 40 is outer, at outer tube extension pipe 80 inner wall, the corresponding screw thread that sets up of inner tube extension pipe 40 outer wall for inner tube extension pipe 40 and outer tube extension pipe 80 threaded connection. Or, inner tube extension pipe 40 and outer tube extension pipe 80 are through axial sliding connection, if through spout or slide rail control displacement direction, through the axial positioning structure, the realization form of axial positioning structure has a lot, for example in sliding connection department, through the locating hole, the locating pin cooperation restriction removes, set up a plurality of locating holes along the axial and realize axial displacement volume and adjust, or remove through the restriction of elasticity backstop portion, it realizes axial displacement volume and adjusts to set up a plurality of elasticity backstop portions along the axial, or realize sliding connection through spout and sliding lug sliding fit, with control axial displacement, set up the recess in spout UNICOM at the spout side, it changes over into the recess to rotate the interior outer pipe messenger's slip lug from the spout, realize axial fixity, set up a plurality of recesses through spout unilateral or both sides limit axial interval and realize the control of displacement volume. Or, as shown in fig. 10, the inner tube extension tube 40 and the outer tube extension tube 80 are sleeved by the latch, and the axial movement and positioning are realized by the latch, for example, when the outer tube extension tube 80 is sleeved outside the inner tube extension tube 40, a plurality of latches which are engaged with each other are correspondingly arranged on the inner wall of the outer tube extension tube 80 and the outer wall of the inner tube extension tube 40, and the axial movement can be realized by directly applying an axial force, and the axial positioning is realized by the latch when no force is applied; the latch can be made of plastic, can deform to a certain extent when stressed, and can be made of other suitable materials.

Taking the screw connection as an example, as shown in fig. 1, the inner tube extension tube 40 and the outer tube extension tube 80 are connected by screw, and are driven by the axial force converted from the screw rotation, so that the inner tube 4 moves towards the head end or the tail end, as shown by the arrow in the figure, the direction is the head end direction, at this time, the inner tube 4 moves towards the head end, the outer tube 8 moves towards the tail end, and the bag is supported by the support member, so that the extending length of the bag is increased. The inner tube extension tube 40 is threaded with the outer tube extension tube 80 so that the balloon is pushed out of the outer tube by the stylet at a rate consistent with the thread precession rate.

The length of the capsular bag can be selected according to the actual condition clinically, the effective length of the capsular bag finally implanted is determined according to the perspective result due to the difference of the size of the vertebral body and the puncture angle, and the effective length is controlled by the structure. The risk of the small capsular bag for the large vertebral body and the risk of the large capsular bag for the small vertebral body are avoided, and the structure is directly adjusted to be in a proper state.

When the bone cement is filled, the inner tube extension tube 40 and the outer tube extension tube 80 are rotated reversely, the inner tube 4 moves to the tail end, and the inner tube 4 can be separated.

In other embodiments, the axial movement and the stop positioning of the inner tube 4 and the outer tube 8 can also be controlled electrically, such as by connecting the inner tube 4 and the outer tube 8 through an electric push rod, and driving the axial displacement direction and displacement amount of the electric push rod through a motor, which can be a stepping motor, a servo motor, or the like.

Further, the inner tube communicates with the bladder through one or more openings 41.

As shown in fig. 2, the opening 41 is formed at an end portion in the axial direction of the inner pipe. Of course, as shown in fig. 4, the openings 41 may be arranged at the end and side of the inner pipe in the axial direction and the radial direction of the inner pipe, the openings being distributed along the length direction of the inner pipe in the axial direction, and the openings being arranged in different directions in the radial direction.

According to the effective length of the bag and the filling requirement, the effective length of the bag can also be called the length to be filled of the bag, the length of the inner tube 4 can be set to be 0.1-100mm beyond the end surface of the outer tube 8, the length of the bag can be freely adjusted, and different use requirements can be met. Meanwhile, the effect that the bone cement of each specification is not blocked at the near end is ensured, so that the failure mode is far away from the inlet, and leakage is prevented. Failure modes are defined as the mesh bag breaking away from the inner tube and the outer tube, bursting, bone cement leakage and operation failure.

The length of the inner tube inside the capsular bag may be up to 100%, preferably 5-95%, and may be 20-80%, 30-70%, or 50% of the effective length of the capsular bag.

The effect of filling the bag bone cement can be adjusted by adjusting the position of the bone cement injection port in the bag, namely when the bag bone cement is filled fully, the bag can not be too concentrated due to the pressure at a certain position, and the condition that the bag structure is broken or the bag structure is scattered can be avoided. Meanwhile, the perfusion pressure of the bone cement is reduced, and the operation of a clinician is facilitated. For example, the opening is axially provided in a plurality along the inner tube, the opening is provided in different directions on the side of the inner tube, and the opening shape includes a circle, a clover shape, a screw thread shape, an ellipse, a square, a rectangle, and the like.

In one embodiment, as shown in fig. 4, the length of the inner tube 4 inside the bag exceeds 50% of the effective length of the bag, holes of various forms are uniformly distributed on the side surface of the inner tube 4 to serve as openings 41, bone cement is injected into the bag through the uniformly distributed holes on the inner tube, all positions of the bag can be uniformly filled with the bone cement, the degree of the bone cement dispersed from all positions of the bag is uniform, and the degree of the compression of the surface of the bag is the same. The inner tube 4 can be used for carrying out bone cement perfusion at different positions in the bag, and can be used for filling bone cement at different positions of the bag due to different opening directions and shapes on the injection tube. The final shape of the capsular bag is then not fixed and is controllably variable. And furthermore, the filling position and filling direction of the bone cement, the dispersion direction of the bone cement and the like are better controlled, and the leakage risk of the bone cement is further reduced. With reference to fig. 2 and fig. 1, the supporting member is a needle core 1, one end of the needle core 1 passes through the inner tube 4 and is connected to the bag head end 62, the bag head end 62 is provided with a head end fixing base 7, the head end fixing base 7 is connected to and locked with the bag head end 62, the head end fixing base 7 is provided with a blind hole 73, and the needle core 1 extends into the blind hole 73 to support the bag.

The head end fixing base 7 will be described below.

Specifically, the head end fixing seat 7 includes a fixing seat shaft 71 and a fixing seat ring 72, the fixing seat shaft 71 is provided with a blind hole 73, the fixing seat shaft 71 is covered by the bag 6 at the bag head end 61, and the fixing seat ring 72 is sleeved on the fixing seat shaft 71 to clamp the bag 6 between the fixing seat shaft 71 and the fixing seat ring 72. The shaft of the retainer shaft 71 is driven into the inner hole of the retainer ring 72 by interference, over-drive or clearance, and the bag is tightened to prevent the bag from withdrawing. When the retainer shaft 71 and retainer ring 72 are used to tighten the head end of the capsular bag, the retainer shaft 71 and retainer ring 72 may be located on the same side or different sides of the capsular bag, which is not limited herein.

The outer surface of the fixed seat shaft member 71 and the inner surface of the fixed seat ring member 72 are provided with structures for increasing friction force, such as tooth shapes, threads, grooves or structures for coarse sand blasting.

As shown in fig. 2, the head end fixing base 7 includes a fixing base shaft 71 and a fixing base ring 72, the fixing base shaft 71 is provided with a blind hole 73, the fixing base shaft 71 is covered by the bag 6 at the bag head end 61, and the fixing base ring 72 is sleeved on the fixing base shaft 71 to clamp the bag 6 between the fixing base shaft 71 and the fixing base ring 72. The fixing seat ring member 72 is a cap member, the fixing seat shaft member 71 is a rod member, and the cap member is sleeved on the end of the rod member to lock the bag 6 between the cap member and the rod member. In this embodiment, the anchor shaft 71 is located on the inside or outside of the capsular bag and the anchor ring 72 is located on the outside of the capsular bag.

As shown in the embodiment of fig. 4, the head end fixing seat 7 includes a fixing seat shaft 71b and a fixing seat ring 72b, the fixing seat shaft 71b is provided with a blind hole 73b, the bag 6 at the bag head end 61 covers the fixing seat shaft 71b, and the fixing seat ring 72b is sleeved on the fixing seat shaft 71b to clamp the bag 6 between the fixing seat shaft 71b and the fixing seat ring 72 b. The fixing seat shaft 71b is of a cap rod structure and comprises a cap part and a rod part, the rod part is matched with the fixing seat ring 72b to clamp the bag, and the cap part limits the fixing seat ring 72b to prevent the fixing seat ring 72b from being removed. In this embodiment, the anchor shaft 71b is located on the inside or outside of the capsular bag and the anchor ring 72b is located on the outside of the capsular bag. A groove 74b is formed at the matching position of the rod part and the fixed seat ring piece 72b, so that the movement of the fixed seat ring piece 72b is further limited, and the fixed seat ring piece 72b is clamped in the groove 74 b.

As shown in fig. 3, the fixing seat shaft 71a is a cap rod structure, and includes a cap portion and a rod portion, the rod portion cooperates with the fixing seat ring 72a to clamp the bag, and the cap portion restricts the fixing seat ring 72a to prevent the fixing seat ring 72a from being removed. In this embodiment, the anchor shaft 71a is located on the outside of the capsular bag and the anchor ring 72a is located on the inside of the capsular bag.

As shown in fig. 1, the bone-filling sac may further comprise an outer tube fixing member 3 sleeved outside the outer tube 8, the outer tube fixing member 3 may be used to connect with an external fixing device (such as an external channel, etc.) to fix the outer tube 8, and a non-slip washer may be further disposed at the connection between the outer tube fixing member 3 and the outer tube 8 to further reinforce the connection between the outer tube fixing member 3 and the outer tube 8, so as to prevent the outer tube fixing member 3 from sliding. The bone filling pouch may further include a handle 2 connected to the inner tube 4 and the outer tube 8 for easy grasping; the end of the needle core 1 can be provided with a needle core disengaging part 11, the needle core disengaging part 11 is fixedly connected with the needle core 1, and the needle core disengaging part 11 is detachably connected with the handle 2, such as by being in threaded fit with the handle 2, so that the needle core 1 can be conveniently installed on the bag 6 or can be conveniently separated from the bag 6.

In the above embodiments, the needle core as the supporting member may be straight or have a curvature, and the curvature angle is in the range of 0-120 °. Preferably, the supporting member may be solid or hollow; the material can be all-metal or high molecular material; it may be rigid or flexible; it may be a memory metal or a non-memory metal. The final purpose is to realize the supporting and fixing function of the supporting piece on the net body structure. And because of the heterogeneity of the forming structure, different placement shapes of the capsular bag in the vertebral body bone and the filling condition of the final bone cement can be realized. As shown in fig. 5, the capsular bag has a curvature angle α, 80 °.

In addition, in each embodiment, in order to make the whole structure of the capsular bag clearly visible after the operation, the clinician can conveniently control the placement of the capsular bag and judge whether the capsular bag is placed in the target position area, and the head end and the tail end of the capsular bag are provided with the developing pieces.

Specifically, the developing piece is a developing line and is integrally formed with the bag in a weaving or raw material blending mode; or the developing piece is a developing coating which is coated on the bag; or the developing member is an elastic developing ring and is adhered to the surface of the bag.

The embodiments described above all use a stylet as a support member, and in other embodiments, the stylet is eliminated and the inner tube 4 extends to the head end of the capsular bag, the inner tube 4 contacting or connecting with the head end of the capsular bag to support the capsular bag.

The structure for controlling the length of the bladder when the inner tube 4 is used as a support will be described.

On the basis of the embodiment that the inner tube is extended into the supporting piece, the control end of the capsular bag is further improved, so that the length of the capsular bag can be adjusted. The inner tube 4 is adopted to extend to the head end of the sac, and the inner tube 4 is contacted with or connected with the head end of the sac to support the sac.

At this time, the structure of the control part of the capsular bag length is the same as that of the above embodiment in which the needle core serves as a support, and referring to fig. 6, the inner tube 4 and the outer tube 8 are sleeved so that the inner tube is axially moved relative to the outer tube. The sleeve joint of the inner pipe 4 and the outer pipe 8 is also provided with an axial positioning piece. See the above examples for specific structures. The difference is that the inner tube 4 moves towards the head end or the tail end relative to the outer tube, as shown by the arrow in the figure, the inner tube 4 moves towards the head end, so that the inner tube directly applies axial force to the head end fixing piece at the head end to support the capsular bag, the outer tube moves towards the tail end, the length of the capsular bag extending out of the outer tube is lengthened, and capsular bags with different length specifications are formed; the inner tube 4 can be withdrawn by moving the inner tube 4 towards the trailing end.

As shown in fig. 7, the inner tube is contacted with the head end of the capsular bag, but the length adjustment of the capsular bag of this embodiment is different in that the inner tube 4 is moved toward the head end or the tail end relative to the outer tube, so that the inner tube directly applies an axial force to the head end of the capsular bag to support the capsular bag, and the outer tube is moved toward the tail end, so that the length of the capsular bag extending out of the outer tube is increased, thus forming capsular bags with different length specifications; the inner tube 4 can be withdrawn by moving the inner tube 4 towards the trailing end.

As shown in fig. 7, the inner tube 4 is extended to directly contact the head end 62 of the capsular bag, which is a single capsular bag. By single pouch is meant here a pouch without a fixture at the head end, i.e. a single pouch. The fixing piece is not arranged at the head end of the bag, so that the head end of the bag structure is tightened to cause the condition that the bone cement cannot be dispersed to the front end, and therefore, the bone cement is dispersed out of the pores of the bag more uniformly. Meanwhile, one loose and disintegrated area is also reduced due to the reduction of one binding port of the head. The position of the whole structure can be clearly seen at the head end of the supporting tube.

In this embodiment, the bag head end may be formed by weaving or thermal processing, and the structure may be denser or thicker, or the bag head end may be of a multi-layer structure, so as to enhance the supporting force of the bag when the inner tube supports and withstands the bag.

With regard to the arrangement of the opening 41 on the inner tube 4, the arrangement of the inner tube and outer tube gap locking bladder 5, etc., reference is made to the above embodiments and will not be further developed.

In addition, the inner tube 4 of the present embodiment extends to the front end of the balloon so that the inner tube 4 can be used for cement infusion at any position of the balloon.

The inner tube extension is support piece, can be directly outside contacting with the bag head end, can also support the bag head end through the head end mounting.

Referring to fig. 8, the difference from the embodiment shown in fig. 7 above is that the inner tube 4 is connected to the capsular bag by the head end fastener 7c as it extends to the head end 62 of the capsular bag. The head end fixing part 7c is arranged at the head end of the bag, the head end fixing part 7c is connected with the head end of the bag, and the inner tube 4 is connected with the head end of the bag through the head end fixing part 7 c. The structure of the head end fixing member 7c can refer to the head end fixing base 7. The head end fixing piece 7c is a locking piece and comprises a shaft piece 71c and a ring piece 72c, the bag at the head end of the bag covers the shaft piece 71c, and the ring piece 72c is sleeved on the shaft piece 71c to clamp the bag 6 between the shaft piece 71c and the ring piece 72 c. The outer surface of the shaft 71c and the inner surface of the ring 72c are provided with structures for increasing friction, such as teeth, threads, grooves or coarse sand blasting structures. The structure of the shaft 71c of the head end fixing part 7c and the ring part 72c which are matched to clamp the capsular is the same as the matching structure of the fixing seat shaft 71 and the fixing seat ring part 72 of the head end fixing seat 7 when the stylet is used as a supporting part; the difference is that when the inner tube 4 is used as a support member, the blind hole 73 does not need to be arranged to enhance the supporting function, but the axial supporting force of the inner tube 4 on the head end fixing piece 7c needs to be enhanced, and meanwhile, the radial displacement of the inner tube needs to be prevented. The inner tube 4 may be connected to the head end fixing member 7c, or may abut: if inner tube 4 to head end mounting 7c lug connection, for example welding, bonding, threaded connection, nested connection, or through connecting piece connection etc. or inner tube 4 to head end mounting 7c butt, during the butt or during the connection, all need set up radial limit structure, prevent inner tube radial movement, radial limit structure if set up structures such as profile of tooth, screw thread, groove or coarse blasting at butt face or junction. The inner tube 4 is closely fixed between as the stay tube and the head end fixing piece, and when keeping zonulae occludens between the two and making bone cement pour into, the position of bag place is fixed, and can not because of resistance increase, and the shift position finally realizes the effect that target position bone cement fills.

As shown in fig. 8, the head end of the inner tube 4 may be nested with the end of the retainer shaft 71c nested within the head end opening of the inner tube 4 such that the inner tube 4 supports the capsular bag and restricts the movement of the capsular bag from being dislocated in the radial direction. Or, the head end fixing piece and the inner tube are supported by contacting, as shown in fig. 9, the radius of the head end of the inner tube 4 is reduced to form a closed end, a boss is arranged at the matching end of the shaft piece 71d, the boss extends into the closed end, the gap between the boss and the closed end is small, the inner tube can support the head end of the bag, and meanwhile, the inner tube is limited by the boss and cannot move radially, and cannot move in a staggered manner; in this embodiment, the inner tube is sleeved outside the shaft, but in other embodiments, the shaft may be sleeved outside the inner tube, or may be in other forms of contact, such as axial support and radial dislocation prevention by concave-convex tooth-shaped engagement. With respect to fig. 9, shaft 71d cooperates with ring 72d to clamp the structure of the capsular bag, where it is not deployed.

Further, when the inner tube is connected with the bag head end, in order to realize that the inner tube can be separated, the inner tube and the bag head end can be separated, and the separated connection comprises a broken connection and a quick-release connection. When the head end fixing piece and the inner tube are connected in a breaking mode, the inner tube is close to the head end fixing piece and is provided with a self-breaking groove, or the head end fixing piece is close to the inner tube and is provided with a self-breaking groove, as shown in fig. 8, the head end fixing piece is provided with a self-breaking groove. The quick-release connecting finger can be quickly detached from the connecting structure, such as threaded connection, detachable buckle connection and the like. Or, the head end fixing piece and the inner tube are supported by contacting, as shown in fig. 9, the radius of the head end of the inner tube 4 is reduced to form a closed end, a boss is arranged at the matching end of the shaft piece 71d, the boss extends into the closed end, the gap between the boss and the closed end is small, the inner tube can support the head end of the bag, and meanwhile, the inner tube is limited by the boss and cannot move radially, and cannot move in a staggered manner; in this embodiment, the inner tube is sleeved outside the shaft, but in other embodiments, the shaft may be sleeved outside the inner tube, or may be in other forms of contact, such as axial support and radial dislocation prevention by concave-convex tooth-shaped engagement.

In the above embodiments, the inner tube may be straight or have a curvature, and the curvature angle ranges from 0 to 120 °. Preferably, the supporting member may be solid or hollow; the material can be all-metal or high molecular material; it may be rigid or flexible; it may be a memory metal or a non-memory metal. The final purpose is to realize the supporting and fixing function of the supporting piece on the net body structure. And because of the heterogeneity of the forming structure, different placement shapes of the capsular bag in the vertebral body bone and the filling condition of the final bone cement can be realized.

Specifically, the developing piece is a developing line and is integrally formed with the bag in a weaving or heating mode; or the developing piece is a developing coating which is coated on the bag; or the developing member is an elastic developing ring and is adhered to the surface of the bag.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The bone filling bag is characterized by comprising a bag, an inner tube and an outer tube, wherein the opening end of the bag is a bag tail end, the other end of the bag is a bag head end, the bag tail end is sleeved on the inner tube, the outer tube is sleeved on the bag, the bag is clamped between a gap between the inner tube and the outer tube, the bag tail end is locked, and one end of the inner tube is communicated with the bag;

the inner tube is axially movable relative to the outer tube;

2. The bone filling balloon of claim 1, wherein the inner tube is sleeved with the outer tube, the inner tube moving axially relative to the outer tube.

3. The bone filling pouch of claim 2, wherein the socket is a threaded socket; or the sleeve joint is a sliding sleeve joint or a clamping tooth sleeve joint

4. The bone filling balloon of claim 1, wherein the inner tube and the outer tube are connected by an electrical push rod for axial movement and positioning.

5. The bone filling balloon of claim 1, wherein the inner tube extends no further than the balloon head end, the inner tube being free of contact, contacting, or connecting with the balloon head end.

6. The bone filling balloon of claim 5, wherein the inner tube extends to the balloon head end, the inner tube being in direct contact with the balloon head end.

7. The bone filling balloon of claim 6, wherein the balloon tip is thickened or multilayered.

8. The bone filling balloon of claim 5, wherein the inner tube is not in contact with the balloon head end, further comprising a stylet, one end of the stylet passing through the inner tube to connect or contact the balloon head end.

9. The bone-filling balloon of claim 5 or 8, wherein the inner tube is connected to the balloon head end, or the needle is connected to or in contact with the balloon head end, the balloon head end is provided with a head end fixture connected to the balloon head end, and the inner tube or the needle supports the balloon head end via the head end fixture.

10. The bone filler pouch of claim 9, wherein the head end fastener is a locking member comprising a shaft and a ring, the pouch at the head end of the pouch covering the shaft, the ring fitting over the shaft to clamp the pouch between the shaft and the ring.

11. The bone filling bladder according to claim 10, wherein the outer surface of the shaft and the inner surface of the ring are provided with friction enhancing structures.

12. The bone filling bladder of claim 11, wherein the shaft is of a cap-stem construction comprising a cap portion and a stem portion, the stem portion engaging the ring to clamp the bladder, the cap portion restraining the ring against removal of the ring.

13. The bone filling pouch of claim 12, wherein a groove is provided in the stem portion at the location of engagement with the ring member, and the metal shaft member is captured in the groove.

14. The bone filling bladder of claim 11, wherein the ring member is a cap member and the shaft member is a stem member, the cap member being fitted over an end of the stem member to lock the bladder between the cap member and the stem member.

15. The bone filling balloon of claim 9, wherein the inner tube is releasably connected to the balloon head end.

16. The bone filling bladder according to claim 15, wherein the detachable connection comprises a break-off connection, a quick-release connection.

17. The bone-filling pouch of claim 16, wherein when the head end fixture is connected to the inner tube in a break-away manner, the inner tube is provided with a self-breaking groove adjacent to the head end fixture, or the head end fixture is provided with a self-breaking groove adjacent to the inner tube.

18. The bone filling balloon of any one of claims 1-17, wherein the sidewall of the inner tube is provided with a plurality of openings in communication with the balloon; the opening is arranged axially along the inner tube and/or the opening is arranged radially along the inner tube.

19. A bone filling balloon according to any one of claims 1-17, wherein the inner and outer tubes are radially constricted at their leading ends to reduce the gap and lock the balloon trailing end, and wherein the inner and outer tubes are provided with anti-slip means on their surface where the leading ends are radially constricted.

20. The bone filling bladder according to claim 19, wherein the anti-slip feature is a circumferential groove or a sand blast.