Implantable expandable mesh bag kit

Abstract

An implantable expandable mesh bag kit, comprising a connection head and a mesh bag mounted on the connection head. The mesh bag is of a pocket-like structure and is provided with an opening and a blind end opposite to the opening. The connection head comprises an inner tube and an outer tube. Both the inner tube and the outer tube comprise a first connection end on a side facing the mesh bag and a second connection end on a side facing a holder. An annular clamping gap for compressing an opening end of the mesh bag is formed between the first connection end of the inner tube and the outer tube. The clamping gap sequentially comprises, in the direction of the mesh bag, a first annular section, a transition annular section, and a second annular section with a diameter smaller than that of the first annular section. When the inner tube moves toward a side of the mesh bag relative to the outer tube, as the transition annular section shortens, the opening end of the mesh bag is compressed in the clamping gap. A tie rope for tying the opening is arranged on the mesh bag and located on the outer side of the inner tube. The implantable expandable mesh bag kit forms a separate assembly, which facilitates the mounting of the kit during surgery.

Description

An implantable expandable mesh bag kit Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an implantable expandable mesh bag kit. Background Technology

[0002] Spinal fusion surgery is gradually evolving from open surgery to minimally invasive procedures. While current minimally invasive fusion techniques are significantly less invasive than open surgery, the size of the fusion device necessitates creating a larger access channel during the procedure. This still presents some trauma compared to conventional minimally invasive surgery, affecting both spinal stability and soft tissue health. Furthermore, most fusion devices currently on the market contain relatively little implanted bone, resulting in limited integration between the graft and the original bone tissue, leading to lower fusion rates and longer recovery times. Summary of the Invention

[0003] To address the aforementioned issues, this application provides an implantable expandable mesh bag kit that is not only small in size but also increases the bonding area between the bone graft and the original bone tissue, thereby improving the fusion rate.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An implantable expandable mesh bag kit includes a connector and a mesh bag mounted on the connector;

[0006] The mesh bag has a pocket-like structure with an opening and a blind end opposite the opening;

[0007] The connector includes an inner tube and an outer tube. Both the inner tube and the outer tube include a first connecting end facing the mesh bag and a second connecting end facing the handle. An annular clamping gap is formed between the first connecting end of the inner tube and the outer tube to squeeze the opening end of the mesh bag.

[0008] The clamping gap includes, in sequence, a first ring segment, a transition ring segment, and a second ring segment with a diameter smaller than that of the first ring segment along the direction toward the mesh bag. When the inner tube moves toward the mesh bag relative to the outer tube, as the transition ring segment shortens, the open end of the mesh bag is squeezed into the clamping gap.

[0009] The mesh bag is provided with a tying rope on the outside of the inner tube for securing the opening.

[0010] Furthermore, the second connecting end of the outer tube is provided with a first connecting thread that mates with the outer sleeve of the gripper, and the second connecting end of the inner tube is provided with a second connecting thread that mates with the disassembly tool.

[0011] Furthermore, the inner tube also includes an intermediate section, and a second shoulder is formed between the second connecting end of the inner tube and the intermediate section. The first connecting thread is an internal thread. The mounting end of the outer tube includes a connecting section and a pushing section in sequence along the direction toward the connector. When the outer tube is connected to the connecting section, the pushing section is inserted into the gap between the inner tube and the outer tube and abuts against the second shoulder.

[0012] Furthermore, the inner tube only has the degree of freedom to slide axially relative to the outer tube.

[0013] Furthermore, the mesh bag is made by weaving and is stretchable. When filler is injected, the volume of the mesh bag increases, and the mesh size of the mesh bag also increases accordingly.

[0014] Furthermore, the mesh bag includes a sparse portion and a dense portion from the blind end to the opening, and the dense portion has a constricted opening structure.

[0015] Furthermore, the mesh bag has greater stretchability in the transverse direction than in the longitudinal direction.

[0016] Furthermore, the middle part of the tightening rope is repeatedly inserted into the inner and outer sides of the mesh bag, and both free ends of the tightening rope extend through the side wall of the mesh bag to the outside of the mesh bag. When the two free ends are pulled, the mesh bag can be locally tightened.

[0017] Furthermore, the end opposite to the opening is open and is formed into a blind end by binding.

[0018] Furthermore, the binding part of the blind end is located inside the mesh bag.

[0019] The beneficial effects of this invention are:

[0020] The implantable expandable mesh bag kit provided in this application installs the mesh bag on the connector head and forms a separate filling component. The overall size is small and can be easily passed through narrow surgical channels. Compared with traditional fusion devices, it can reduce the impact on spinal stability and soft tissue damage because it does not require the establishment of a large surgical channel.

[0021] In addition, the implantable expandable mesh bag kit provided in this application uses a mesh bag to implant bone tissue, which effectively increases the amount of bone tissue implanted compared to traditional fusion devices, increases the bonding area between the bone graft and the original bone tissue, improves the postoperative fusion rate, and shortens the recovery time. Attached Figure Description

[0022] Figure 1 is a schematic diagram of an implantable expandable mesh bag kit provided in an embodiment of this application;

[0023] Figure 2 is an enlarged structural diagram of part A in Figure 1;

[0024] Figure 3 is a schematic diagram of the clamping gap formed by the inner tube and the outer tube;

[0025] Figure 4 is an enlarged structural diagram of part B in Figure 3;

[0026] Figure 5 is a schematic diagram of the connection between an implantable expandable mesh bag kit and a holder provided in an embodiment of this application;

[0027] Figure 6 is an enlarged structural diagram of part C in Figure 5;

[0028] Figure 7 is an exploded view of an implantable expandable mesh bag kit connected to a holder according to an embodiment of this application;

[0029] Figure 8 is a schematic diagram of the structure of the mesh bag in the contracted state;

[0030] Figure 9 is a schematic diagram of the tying structure of the mesh bag;

[0031] Figure 10 is a schematic diagram of the structure of the mesh bag in an inflated state;

[0032] Figure 11 is a schematic diagram of the blind end structure of the mesh bag;

[0033] Figure 12 is an enlarged structural diagram of part D in Figure 11.

[0034] In the diagram: 1. Connector; 11. Inner tube; 1111. First shaft segment; 1112. Second shaft segment; 1113. First stepped surface; 112. Second connecting thread; 113. Intermediate section; 114. First shoulder; 115. Second shoulder; 12. Outer tube; 1211. First hole segment; 1212. Second hole segment; 1213. Second stepped surface; 122. First connecting thread; 13. Clamping gap; 131. First annular segment; 132. Transition annular segment; 133. Second annular segment;

[0035] 2. Mesh bag; 21. Opening; 22. Blind end; 221. Binding part; 23. Loose part; 24. Dense part;

[0036] 3. Tighten the rope; 311. Inner section; 312. Outer section; 32. Free end;

[0037] 4. Outer casing; 41. Connecting section; 42. Pushing section. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are merely a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the protection scope of this application.

[0039] As shown in Figure 1, an implantable expandable mesh bag kit includes a connector 1 and a mesh bag 2 mounted on the connector 1.

[0040] As shown in Figure 6, the mesh bag 2 has a pocket-like structure with an opening 21 and a blind end 22 opposite to the opening 21.

[0041] As shown in Figure 1, the connector 1 includes an inner tube 11 and an outer tube 12 sleeved outside the inner tube 11. The inner tube 11 is axially slidable relative to the outer tube 12, and the inner tube 11 and the outer tube 12 are arranged coaxially. Both the inner tube 11 and the outer tube 12 include a first connecting end facing the mesh bag 2 and a second connecting end facing the handle.

[0042] As shown in Figures 1 and 2, the end of the mesh bag 2 with an opening 21 is the opening 21 end. The opening 21 end of the mesh bag 2 is inserted into the connector 1, and the opening 21 end of the mesh bag 2 is clamped between the inner tube 11 and the outer tube 12. An annular clamping gap 13 is formed between the first connecting end of the inner tube 11 and the outer tube 12 to squeeze the opening 21 end of the mesh bag 2.

[0043] As shown in Figures 3 and 4, the clamping gap 13, along the direction towards the mesh bag 2, sequentially includes a first ring segment 131, a transition ring segment 132 (i.e., the portion between the two dotted lines in Figure 3), and a second ring segment 133. The diameter of the first ring segment 131 is larger than the diameter of the second ring segment 133, and the transition ring segment 132 serves to transitionally connect the first ring segment 131 and the second ring segment 133. The opening 21 end of the mesh bag 2 extends to the first ring segment 131, and as the inner tube 11 moves relative to the outer tube 12 toward the mesh bag 2, the opening 21 end of the mesh bag 2 is squeezed tightly within the clamping gap 13 as the transition ring segment 132 shortens.

[0044] In one specific embodiment, the outer surface of the first connecting end of the inner tube 11 in this embodiment has a stepped shaft structure, and sequentially includes a first shaft segment 1111 and a second shaft segment 1112 along the direction toward the mesh bag 2. The diameter of the first shaft segment 1111 is larger than the diameter of the second shaft segment 1112, and a first stepped surface 1113 is formed between the first shaft segment 1111 and the second shaft segment 1112. The inner hole of the first connecting end of the outer tube 12 has a stepped hole shape, and sequentially includes a first hole segment 1211 and a second hole segment 1212 along the direction toward the mesh bag 2. The diameter of the first hole segment 1211 is larger than the diameter of the second hole segment 1212, and a second stepped surface 1213 is formed between the first hole segment 1211 and the second hole segment 1212. The first stepped surface 1113 and the second stepped surface 1213 can be planes perpendicular to the axis, conical surfaces, or arc-shaped surfaces. For example, in this embodiment, both the first stepped surface 1113 and the second stepped surface 1213 are conical surfaces.

[0045] The mesh bag 2 is provided with a tying rope 3 on the outside of the inner tube 11 for tying up the opening 21.

[0046] As shown in Figures 5 and 6, the second connecting end of the outer tube 12 is provided with a first connecting thread 122 that mates with the outer sleeve 4 of the gripper, and the second connecting end of the inner tube 11 is provided with a second connecting thread 112, which can mate with the disassembly tool.

[0047] In use, first connect the outer tube 12 of connector 1 to the outer tube 4 of the holder (at this time, the mesh bag 2 has been tightly installed at the first connecting end of connector 1). Then, the filling component with the mesh bag 2 can be inserted into the patient's body through the holder to fill the filling material. After the filling material is filled and the binding rope 3 is tightened, remove the holder, then connect the disassembly tool to the second connecting end of the inner tube 11, and pull the inner tube 11 backward, so that the inner tube 11 moves away from the outer tube 12 from the mesh bag 2, thereby detaching the mesh bag 2 from the first connecting end of connector 1. At this time, connector 1 is detached from the mesh bag 2, and connector 1 can be removed as a whole using the disassembly tool.

[0048] In one specific embodiment, the second connecting thread 112 provided on the second connecting end of the inner tube 11 is an external thread, and correspondingly, the end of the disassembly tool is provided with an internal thread that mates with the external thread on the second connecting end of the inner tube 11.

[0049] In one specific implementation, the first connecting thread 122 described in this embodiment is an internal thread, and the outer sleeve 4 of the gripper is provided with an external thread that mates with the first connecting thread 122.

[0050] Furthermore, the inner tube 11 also includes an intermediate section 113 located between the first connecting end and the second connecting end, and the maximum outer diameter of both the first connecting end and the second connecting end of the inner tube 11 is smaller than the outer diameter of the intermediate section 113. A first shoulder 114 is formed between the first connecting end of the inner tube 11 and the intermediate section 113, and a second shoulder 115 is formed between the second connecting end of the inner tube 11 and the intermediate section 113.

[0051] Further, as shown in Figures 5, 6, and 7, the outer surface of the mounting end of the outer sleeve 4 of the gripper is stepped and includes a connecting section 41 and a pushing section 42 in sequence along the direction towards the connector 1, and the outer diameter of the connecting section 41 is larger than the outer diameter of the pushing section 42. An external thread that mates with the first connecting thread 122 is provided on the connecting section 41, and when the outer tube 12 is connected to the connecting section 41, the pushing section 42 is inserted into the gap between the inner tube 11 and the outer tube 12 and abuts against the second shoulder 115.

[0052] The reason for this design is that during surgery, the mesh bag 2 is not only fixed by the squeezing force between the inner tube 11 and the outer tube 12, but also prevented from moving away from the mesh bag 2 by the pushing limit of the outer tube 4 of the holder, thereby preventing the mesh bag 2 from slipping off the connector 1 during surgery.

[0053] Furthermore, the outer diameter of the middle section 113 of the inner tube 11 matches that of the outer tube 12. That is, the inner tube 11 only has the degree of freedom to slide axially relative to the outer tube 12.

[0054] The reason for this design is that if the outer diameter of the middle section 113 is smaller than the inner diameter of the outer tube 12, the inner tube 11 will not only have a free end 32 that can slide axially relative to the outer tube 12, but will also be able to swing relative to the outer tube 12 within a certain angle range. This is not conducive to the locking and fixing of the mesh bag 2, and the mesh bag 2 is prone to slipping off during use as the inner tube 11 and the outer tube 12 move relative to each other.

[0055] Furthermore, while the mesh bag 2 currently used for filling bone cement is relatively soft, it lacks elasticity. Additionally, because the mesh bag 2 needs to be inserted into the body through a pre-existing channel created for minimally invasive surgery, this channel is often very small to minimize damage. During insertion, to ensure the mesh bag 2 can smoothly pass through the surgical channel and reach the lesion, it needs to be folded and contracted before being placed at the lesion site using surgical instruments. Although this allows the mesh bag 2 to pass through the surgical channel and reach the lesion, it remains folded inside. During surgery, the expansion force of the bone cement filling is needed to open the folded mesh bag 2, often resulting in insufficient opening. If the mesh bag 2 is not fully opened, good contact between the bone cement and surrounding tissues cannot be guaranteed, failing to achieve the desired therapeutic effect.

[0056] Therefore, as shown in Figure 8, the mesh bag 2 is made by weaving textile threads and has elasticity. The woven mesh bag 2, from the blind end 22 to the opening 21, includes a loosely woven section 23 and a densely woven section 24. The dense section 24 has a constricted opening structure to facilitate connection and fixation with medical devices. The loosely woven section 23 has better elasticity, while the densely woven section 24 has less elasticity than the loosely woven section 23 but better tightness, thus allowing it to be better secured to the installation end of the medical device, facilitating the installation of the woven mesh bag 2.

[0057] As shown in Figures 8 and 9, the middle portion of the tightening rope 3 has a serpentine structure and repeatedly weaves through the inner and outer sides of the woven mesh bag 2. Specifically, the middle portion of the tightening rope 3 includes an inner section 311 located inside the woven mesh bag 2 and an outer section 312 located outside the woven mesh bag 2, with the inner section 311 and outer section 312 arranged alternately. Both ends of the tightening rope 3 are free ends 32, and both free ends 32 extend through the sidewalls of the woven mesh bag 2 to the outside of the woven mesh bag 2. As shown in Figure 10, in use, the woven mesh bag 2 can be partially tightened by pulling on the two free ends 32, and then the tightening rope 3 can be tied to seal the opening 21, preventing the filling material from leaking out of the opening 21.

[0058] Preferably, the binding rope 3 is located at the junction of the sparse portion 23 and the dense portion 24.

[0059] As shown in Figures 8 and 10, during use, the volume of the mesh bag 2 increases with the injection of the filler, and the mesh openings of the mesh bag 2 can also increase to a certain extent. This allows the bone cement to fully contact the surrounding tissue, which is conducive to the ingrowth of new tissue and achieves rapid fusion.

[0060] For ease of description, the direction of the line connecting the opening 21 and the blind end 22 is defined as the longitudinal direction, and the direction perpendicular to the longitudinal direction is defined as the transverse direction.

[0061] Furthermore, as shown in Figures 8 and 10, the woven mesh bag 2 has greater stretchability in the transverse direction than in the longitudinal direction.

[0062] Thus, when the woven mesh bag 2 is in a contracted state, it is elongated and slender, allowing it to pass more easily through narrow surgical channels. Once inside the lesion, the injection of filler material causes the mesh bag 2 to expand rapidly laterally, filling the lesion and ensuring full contact between the filler and surrounding tissue.

[0063] Furthermore, as shown in Figures 11 and 12, the end opposite to the opening 21 is open and a closed blind end 22 is formed by binding.

[0064] Thus, when the opening 21 of the woven mesh bag 2 is tied tightly by the tying rope 3, the woven mesh bag 2 as a whole has a structure with both ends tied tightly. After the filling material is injected, it will form an approximately spherical structure as shown in Figure 10, which is more conducive to matching the filling cavity formed by the previous expansion orthotics.

[0065] Furthermore, the binding portion 221 of the blind end 22 is located inside the woven mesh bag 2. In this way, after the filling material is injected, the smooth structure of the outer surface of the blind end 22 is more conducive to filling the filling cavity formed by the previously expanded orthotic.

[0066] Other embodiments obtained by those skilled in the art based on the embodiments provided in this application by combining, splitting, or reorganizing the embodiments of this application do not exceed the protection scope of this application.

[0067] The above detailed embodiments have provided a detailed explanation of the purpose, technical solutions, and beneficial effects of the embodiments of this application. The above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. That is, any modifications, equivalent substitutions, improvements, etc., made on the basis of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. An implantable expandable mesh bag kit, characterized in that: Includes a connector (1) and a mesh bag (2) mounted on the connector (1); The mesh bag (2) has a pocket-like structure, with an opening (21) and a blind end (22) opposite to the opening (21); The connector (1) includes an inner tube (11) and an outer tube (12). Both the inner tube (11) and the outer tube (12) include a first connecting end facing the mesh bag (2) and a second connecting end facing the gripper. An annular clamping gap (13) is formed between the first connecting end of the inner tube (11) and the outer tube (12) for squeezing the opening (21) end of the mesh bag (2). The clamping gap (13) includes, in sequence, a first ring segment (131), a transition ring segment (132), and a second ring segment (133) with a diameter smaller than that of the first ring segment (131) along the direction toward the mesh bag (2). When the inner tube (11) moves toward the mesh bag (2) relative to the outer tube (12), as the transition ring segment (132) shortens, the opening (21) end of the mesh bag (2) is squeezed into the clamping gap (13). The mesh bag (2) is provided with a tying rope (3) for tying the opening (21) on the outside of the inner tube (11).

2. The implantable expandable mesh bag kit according to claim 1, characterized in that: The second connecting end of the outer tube (12) is provided with a first connecting thread (122) that mates with the outer sleeve (4) of the gripper, and the second connecting end of the inner tube (11) is provided with a second connecting thread (112) that mates with the disassembly tool.

3. The implantable expandable mesh bag kit according to claim 2, characterized in that: The inner tube (11) also includes an intermediate section (113). A second shoulder (115) is formed between the second connecting end of the inner tube (11) and the intermediate section (113). The first connecting thread (122) is an internal thread. The mounting end of the outer tube (4) includes a connecting section (41) and a pushing section (42) in sequence along the direction toward the connector (1). When the outer tube (12) is connected to the connecting section (41), the pushing section (42) is inserted into the gap between the inner tube (11) and the outer tube (12) and abuts against the second shoulder (115).

4. The implantable expandable mesh bag kit according to claim 1, characterized in that: The inner tube (11) has only one degree of freedom to slide axially relative to the outer tube (12).

5. The implantable expandable mesh bag kit according to claim 1, characterized in that: The mesh bag (2) is made by weaving and is stretchable. When the filling material is injected, the volume of the mesh bag (2) increases and the mesh size of the mesh bag (2) also increases.

6. The implantable expandable mesh bag kit according to claim 5, characterized in that: The mesh bag (2) includes a sparse part (23) and a dense part (24) from the blind end (22) to the opening (21), and the dense part (24) has a constricted structure.

7. The implantable expandable mesh bag kit according to claim 5, characterized in that: The mesh bag (2) has greater stretchability in the transverse direction than in the longitudinal direction.

8. The implantable expandable mesh bag kit according to claim 1, characterized in that: The middle part of the tying rope (3) is repeatedly inserted into the inner and outer sides of the net bag (2). The two free ends (32) of the tying rope (3) extend through the side wall of the net bag (2) to the outside of the net bag (2). When the two free ends (32) are pulled, the net bag (2) can be locally tightened.

9. The implantable expandable mesh bag kit according to claim 1, characterized in that: The end opposite to the opening (21) is open and is formed into a blind end (22) by binding.

10. An implantable expandable mesh bag kit according to claim 9, characterized in that: The binding part (221) of the blind end (22) is located inside the mesh bag (2).

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