Bag fusion cage

Abstract

The invention discloses a capsular bag fusion cage which comprises a porous capsular bag main body, an implantation sheathing canal for auxiliary installation, and a connecting tube and an injection tube which are used for injecting filler, the porous capsular bag body is compressed and folded into a slender cylinder in a natural state, the porous capsular bag body comprises a telescopic woven sleeve, the porous capsular bag body is integrally woven and formed through arrangement of the porous capsular bag body, the porous capsular bag body can be folded, minimally invasive use is facilitated, the porous capsular bag body is in the slender cylinder shape before implantation, and the implantation sheathing canal assists in being implanted into the intervertebral space; then a connecting channel is constructed through a connecting pipe, and then filler is discharged into the porous bag main body through an injection pipe, so that the porous bag main body is expanded according to a certain preset form, the goodness of fit between the porous bag main body and the intervertebral space is improved, meanwhile, operative wounds are greatly reduced, the hospitalization time is shortened, and rehabilitation of a patient is accelerated; and the use efficiency of the capsular bag fusion cage is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a bag fusion device. Background Technology

[0002] Interbody fusion is one of the most widely used techniques in spinal surgery. Lumbar interbody fusion is mainly used to treat lumbar degenerative instability, lumbar spinal stenosis, lumbar spondylolisthesis, scoliosis, and discogenic pain. The interbody fusion device utilizes the expansion force after placement to stabilize the device, restoring disc height and lumbar fusion to restore physiological curvature and enlarge the intervertebral foramen area. The principle of the interbody fusion device is centered on the diseased intervertebral space. After implantation, the expansion force keeps the muscles, annulus fibrosus, and anterior and posterior longitudinal ligaments of the fusion segment under continuous tension, achieving three-dimensional hyperstatic fixation of the fusion segment and the device. Secondly, by restoring the height of the intervertebral space, the interbody fusion device restores the stress and stability of the anterior and middle columns of the spine, restores and maintains the inherent physiological curvature of the spine, enlarges the intervertebral foramen, and relieves pressure on the dural sac and nerve roots. The hollow structure of the interbody fusion device provides a favorable mechanical environment for the fusion of the cancellous bone within, thereby achieving permanent interfacial fusion.

[0003] Existing conventional fusion devices can be categorized by shape into linear threaded, rectangular, and physiological / anatomical types; by material into pure titanium, titanium alloys, carbon fiber, absorbable materials, and tissue-engineered materials; and by usage into fixed-size, expandable fusion devices, and titanium mesh-filled fusion devices. These fixed-shape structures, relying on height variations to adapt to different intervertebral spaces, cannot perfectly match the patient's intervertebral space. Furthermore, to achieve good support, the support surface needs to be as large as possible during design, resulting in a larger implantation channel, greater patient trauma, and slower postoperative recovery.

[0004] According to CN113967109A, a height-adjustable fusion device for post-graft bone grafting includes: a main body, a blade assembly fitted with the main body, and a pushing assembly fitted with the blade assembly. An end cap is interference-fitted onto one end face of the main body. The main body includes a screw section, a side section integrally connected to both ends of the screw section, and an open section integrally connected to the side section. A threaded through hole is formed on the screw section, and an open through hole is formed on the open section. The pushing assembly includes a first U-shaped base and a threaded rod fixed to the first U-shaped base. The threaded rod passes through the first U-shaped base, and a pin is fixed to one end of the first U-shaped base near the threaded rod.

[0005] The aforementioned height-adjustable fusion device for post-grafting often only allows for variable height or width in terms of mechanical structure. It cannot achieve both height increase and vertebral body contact area, and the mechanical structure limits the bone graft space, affecting the fusion effect. Furthermore, most fusion devices currently used in interbody fusion surgery are fixed-shape block devices with large volumes, requiring a large entry channel during implantation and causing significant patient trauma. Therefore, we need to propose a capsular fusion device. Summary of the Invention

[0006] The purpose of this invention is to provide a capsular fusion device, which optimizes the fabrication and structure of the porous capsular body, reduces the fixed shape of the original structure, allows for implantation through a small incision and on-site anastomosis and shaping, and the porous capsular body is compressed and folded into a slender cylinder in its natural state, significantly reducing surgical trauma, reducing the risk of damage to surrounding nerves and blood vessels, providing stable support, and expanding the capsular body by injecting filler after implantation. At the same time, the elasticity of the woven sleeve allows the capsular body to better conform to the intervertebral space shape, increase the contact area with bone tissue, reduce stress shielding effect, and avoid affecting the bone fusion effect, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a bag fusion device, comprising a porous bag body, an implantable sheath for auxiliary installation, and a connecting tube and an injection tube for injecting filler; the porous bag body is compressed and folded into a slender cylindrical shape in its natural state, and the porous bag body includes a stretchable woven sleeve; during implantation, the porous bag body is connected to the implantable sheath through a connecting plate.

[0008] Preferably, the surface of the woven sleeve has woven micropores that are uniform and interconnected, and the woven sleeve has an integrated woven design.

[0009] Preferably, a developing block is embedded at one end of the woven sleeve, and the developing block and the connecting plate are arranged on the same axis.

[0010] Preferably, the implanted sheath includes a tube body, with a groove formed on the inner wall of one end of the tube body, and a buckle formed on the outer side of the connecting plate corresponding to the groove.

[0011] Preferably, a visible groove is provided at the joint between the tube body and the connecting plate.

[0012] Preferably, one end of the connecting tube is threaded to the opening of the connecting plate through a cavity inside the tube body, and the cavity of the connecting tube is in communication with the porous bag body.

[0013] Preferably, the injection end of the injection tube is inserted into the interior of the porous cyst body through the inner cavity of the connecting tube. After the cyst fusion device expands and opens, the opening of the connecting plate is sealed by the threaded plug cap.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention features a porous pouch body, integrally woven and foldable for easy minimally invasive use. This porous pouch fusion device boasts high strength, restoring the physiological curvature of the spine after expansion. It can withstand significant external forces on the vertebral endplates without deformation or damage, exhibiting excellent stability. Before implantation, it is a slender cylindrical shape. It is inserted into the intervertebral space with the aid of an implantation sheath, and a connecting channel is constructed via a connecting tube. Then, filler is injected into the interior of the porous pouch body through an injection tube, causing it to expand according to a predetermined shape. This improves the fit between the porous pouch body and the intervertebral space, significantly reducing surgical trauma, shortening hospital stays, accelerating patient recovery, and improving the efficiency of the pouch fusion device.

[0015] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall component structure of the present invention; Figure 2 This is a schematic diagram of the overall assembly and use structure of the present invention; Figure 3 This is a schematic diagram of the overall assembly and internal structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the porous bag body and the tube body of the present invention; Figure 5 This is a schematic diagram of the injection tube installation structure of the present invention; Figure 6 This is a schematic diagram of the card slot structure of the present invention; In the diagram: 1. Porous bag body; 11. Braided sheath; 12. Micropore; 14. Connecting plate; 15. Buckle; 16. Sealing cap; 17. Imaging block; 2. Implanted sheath; 21. Tube body; 22. Slot; 23. Visual groove; 3. Connecting tube; 4. Injection tube. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-6The present invention provides a bag fusion device, including a porous bag body, an implantable sheath for auxiliary installation, and a connecting tube and an injection tube for injecting filler; the porous bag body is compressed and folded into a slender cylindrical shape in its natural state, and the porous bag body includes a stretchable woven sleeve. During implantation, the porous bag body is connected to the implantable sheath through a connecting plate.

[0019] In this embodiment, the porous bag body 1 is constructed from a woven structure made of polyethylene terephthalate (PET): the woven sleeve 11 is made of a biocompatible polymer material of polyethylene terephthalate (PET), mainly providing flexibility and a biological interface. The two layers can be integrally formed or nested and fixed through a weaving process. Furthermore, such as Figure 3 As shown, the surface of the woven sleeve 11 has uniform and interconnected micropores 12 formed by weaving. The woven sleeve 11 has an integrated woven design. The pore diameter of the micropores 12 ranges from 0.2 to 0.8 mm. This pore diameter range allows bone cells to grow in while effectively preventing soft tissue invasion. The entire bag is a complete woven body that does not need to be cut, ensuring the overall mechanical integrity of the structure. The porous bag fusion device has a pore diameter of less than 0.2-0.8 mm, and the woven structure cannot be cut under any circumstances. The porous bag fusion device has a length of 23, 26, and 28 mm, a width of 10, 20, and 25 mm, a height of 7-16 mm with each millimeter specification, and an angle of 6-30 degrees. The porous bag fusion device has a front-high and back-low design, which presents an angle after expansion, thereby controlling the shape of the porous bag body 1.

[0020] Furthermore, such as Figure 4 As shown, a radiopaque block 17 is embedded in one end of the braided sleeve 11. The radiopaque block 17 and the connecting plate 14 are set on the same axis. The radiopaque block 17 is embedded in the end of the braided sleeve 11 away from the connecting plate 14, and the central axis of the radiopaque block 17 coincides with the central axis of the connecting plate 14. Meanwhile, the connecting plate 14 is made of PEEK material with radiopaque needles for positioning. The radiopaque block 17 is made of materials with good radiopaque performance such as titanium alloy and tungsten alloy. Together, they form the radiopaque points at both ends, ensuring that the capsular fusion device can be clearly identified and positioned by X-ray or CT equipment during the operation.

[0021] Among them, such as Figure 6As shown, the implantable sheath 2 includes a tube body 21. A groove 22 is provided on the inner wall of one end of the tube body 21. A buckle 15 is provided on the outer side of the connecting plate 14 corresponding to the groove 22. The implantable sheath 2 includes a tube body 21 and a groove 22 on the inner wall of one end of the tube body 21. The inner diameter of the tube body 21 is slightly larger than the outer diameter of the compressed porous bag body 1 to ensure that the bag can be smoothly inserted into the sheath. The number and position of the grooves 22 correspond one-to-one with the buckles 15 on the connecting plate 14. When the porous bag body 1 is inserted into the sheath, the buckles 15 can be inserted into the grooves 22 to achieve a fixed connection between the two, avoiding relative displacement between the porous bag body 1 and the implantable sheath 2 during the implantation process. At the same time, the implantable sheath 2 acts as the main positioning rod for implantation, which can limit the position of the porous bag body 1. When rotating the connecting tube 3, the implantable sheath 2 is held to indirectly control the fixation of the porous bag body 1, preventing the porous bag body 1 from rotating with the connecting tube 3 and causing the threaded connection to become loose.

[0022] Furthermore, such as Figure 6 As shown, a visible groove 23 is provided at the joint between the tube body 21 and the connecting plate 14. The visible groove 23 is distributed in an annular pattern at the joint between the tube body 21 and the connecting plate 14, which makes it easy for doctors to observe the joint status and ensure that the buckle 15 is fully engaged in the slot 22 for reliable connection. At the same time, it is convenient to observe whether the subsequent joint between the connecting tube 3 and the connecting plate 14 is stable, and to ensure that the threaded connection between the connecting tube 3 and the connecting plate 14 is firm.

[0023] In addition, such as Figure 5 As shown, one end of the connecting tube 3 is threadedly connected to the opening of the connecting plate 14 through the cavity inside the tube body 21, and the cavity of the connecting tube 3 is connected to the porous bag body 1. The injection end of the injection tube 4 is movably inserted into the interior of the porous bag body 1 through the inner cavity of the connecting tube 3. The bag connecting tube 3 is a medical-grade soft tube, and one end of it is provided with an external thread, which can be threadedly connected to the internal thread of the opening of the connecting plate 14. The inner cavity of the connecting tube 3 is connected to the interior of the porous bag body 1 to provide a channel for the injection of filler. The injection tube 4 is a catheter matched with a medical syringe, and its injection end can be movably inserted into the inner cavity of the connecting tube 3 and extended into the interior of the porous bag body 1. The other end of the injection tube 4 is connected to the syringe to inject fillers such as bone cement and autologous bone particles into the bag. The design of the connecting tube 3 and the injection tube 4 can ensure that the filler is injected into the bag accurately and efficiently, and at the same time, it is convenient to pull out the injection tube 4 after the injection is completed, and then temporarily seal or further process the bag through the connecting tube 3.

[0024] Furthermore, such as Figure 1As shown, before the fusion device is used, the opening of the connecting plate 14 is sealed by the threaded sealing cap 16. The sealing cap 16 is made of medical-grade plastic and has external threads on the outside, which match the internal threads of the opening of the connecting plate 14. When the fusion device is not in use, the sealing cap 16 seals the opening of the connecting plate 14 by threaded connection to prevent external impurities from entering the interior of the porous bag body 1 and to ensure the cleanliness of the bag.

[0025] In practical application, preoperative preparation includes: such as... Figure 1 As shown, select the appropriate size of the fusion bag according to the size of the patient's intervertebral space, and check the integrity and connection reliability of each component; compress and fold the porous fusion bag body 1 into a slender cylindrical shape; ensure that the fusion bag of this model is inserted into the patient's wound with the smallest volume, which can not only reduce the surgical wound of the patient, but also reduce secondary damage to the surgical wound of the patient.

[0026] Constructing the surgical access: Using standard posterior approach or percutaneous endoscopic discectomy, a surgical access is established to reach the target intervertebral space, the diseased intervertebral disc tissue is thoroughly removed, the vertebral endplate is decorticized, and a bone graft bed is prepared.

[0027] Component assembly: such as Figure 2 In the indicated state, the compressed porous bag body 1 is inserted into the implantation sheath 2, and the buckle 15 on the connecting plate 14 is engaged in the slot 22 of the implantation sheath 2. The connection is confirmed to be reliable through the visible groove 23. The sealing cap 16 is unscrewed, and one end of the connecting tube 3 is threadedly connected to the opening of the connecting plate 14 to ensure a good seal. The injection end of the injection tube 4 is inserted into the inner cavity of the connecting tube 3 and extends into the interior of the porous bag body 1. The other end is connected to the external filler syringe. The syringe slowly injects the filler into the interior of the porous bag body 1 through the injection tube 4. The filler compresses the porous bag body 1 and expands its shape. During the filling process, the position of the injection tube in the inner cavity of the porous bag body 1 is changed to ensure that the filler is evenly filled in the inner cavity of the porous bag body 1 according to certain requirements. The filling is carried out from the inside to the outside of the inner cavity of the porous bag body 1 to avoid the filling situation of gaps and looseness.

[0028] Minimally invasive implantation: Under the guidance of imaging equipment (such as X-ray machine), the implantation sheath 2 containing the porous bag body 1 is inserted into the target position of the patient's intervertebral space through a minimally invasive incision. The implantation position of the bag is confirmed in real time by CT imaging of the imaging block 17 and the connecting plate 14. This avoids the situation where the porous bag body 1 is tilted or not installed properly, and also facilitates the positioning judgment of the filling process and subsequent follow-up examination.

[0029] Bag expansion and filling: such as Figure 3As shown, filler is slowly injected into the porous pouch body 1 through the injection tube 4. As the filler is injected, the pouch gradually expands until it expands to the preset size and fits tightly against the intervertebral space. During the injection process, the imaging images are observed in real time to ensure that the pouch expands evenly without deviation or over-expansion.

[0030] Postoperative care: After the filler is injected, maintain the injection pressure for a period of time to ensure that the filler is fully solidified or stabilized; slowly pull out the injection tube 4, unscrew the connecting tube 3, and if necessary, screw on the sealing cap 16 at the opening of the connecting plate 14 for sealing; finally, slowly pull out the implanted sheath 2, suture the wound to complete the surgical procedure. It is important to note that the implantation process must strictly adhere to minimally invasive surgical guidelines to avoid damage to surrounding nerves, blood vessels, and other tissues. The injection speed and pressure must be controlled during the injection of the filler to prevent rupture of the capsule or leakage due to excessive speed or pressure. Intraoperative imaging equipment is necessary to monitor the position of the contrast medium and the expansion status of the capsule in real time to ensure the safety and effectiveness of the procedure. Postoperatively, routine care and follow-up are required to observe bone fusion and the recovery of spinal function.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A capsular bag fusion device, characterized by: The porous bag body (1), the auxiliary installation implant sheath (2) and the connecting pipe (3) for injecting filling, the injection pipe (4); The porous bag body (1) is compressed and folded into an elongated cylindrical shape in a natural state, and the porous bag body (1) comprises a woven sleeve (11) with elasticity, and the porous bag body (1) is connected with the implant sheath (2) through a connecting plate (14) during implantation.

2. The capsular bag fusion device according to claim 1, characterized in that: The surface of the woven sleeve (11) is woven to form uniform and interconnected micropores (12), and the woven sleeve (11) is designed in an integrated weaving manner.

3. The capsular bag fusion device according to claim 1, characterized in that: One end of the woven sleeve (11) is embeddedly installed with a developing block (17), and the developing block (17) is arranged on the same axis as the connecting plate (14).

4. The capsular bag fusion device according to claim 1, characterized in that: The implant sheath (2) comprises a pipe body (21), and an inner side wall of one end of the pipe body (21) is provided with a clamping groove (22), and an outer side of the connecting plate (14) is provided with a buckle (15) corresponding to the clamping groove (22).

5. The capsular bag fusor of claim 4, wherein: A visible groove (23) is formed at the joint of the pipe body (21) and the connecting plate (14).

6. The capsular bag fusion device according to claim 1, characterized in that: One end of the connecting pipe (3) is threadedly connected with the opening of the connecting plate (14) through the cavity in the pipe body (21), and the cavity of the connecting pipe (3) is communicated with the porous bag body (1).

7. The capsular bag fusion device according to claim 1, characterized in that: The injection end of the injection pipe (4) is movably inserted into the inside of the porous bag body (1) through the inner cavity of the connecting pipe (3), and after the bag fusion device is expanded and expanded, the opening of the connecting plate (14) is threadedly sealed by the sealing cover (16).

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