Drainage catheter and drainage assembly

Abstract

The utility model relates to a drainage catheter and a drainage assembly, and relates to the technical field of medical instruments. The drainage catheter comprises a catheter body, one end of the catheter body is a drainage end, and the other end of the catheter body is a non-drainage end; a plurality of drainage holes are formed in the peripheral surface of the drainage end of the tube body; the end face of the non-drainage end of the tube body is in an opening state; the tube body comprises a soft tube section and at least one hard tube section located at or close to the non-drainage end. The drainage assembly comprises a drainage catheter and a bone nail assembly, and the bone nail assembly comprises a rod body and a tail cap. The drainage catheter is used in cooperation with the bone nail assembly, the anti-infection effect is guaranteed in the drainage operation, meanwhile, the catheter indwelling difficulty is lowered, and injuries caused to a patient are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a drainage catheter and a drainage assembly. Background Art

[0002] Drainage procedures using drainage catheters are a common treatment in modern medicine. By placing a drainage tube during various cavity surgeries, pus and tissue exudate are drained through the catheter, alleviating local symptoms and accelerating recovery. For example, external cranial drainage has become one of the most important and common procedures in neurosurgery, used to treat conditions such as craniocerebral trauma, cerebral hemorrhage, intracranial infection, and hydrocephalus.

[0003] Clinically, the risk of drainage infection increases with prolonged drainage. Subcutaneous drainage catheter placement is a medical technique used to reduce the risk of postoperative infection by securing the drainage catheter away from the wound. This technique is particularly effective in reducing the risk of catheter blockage and intracranial infection during cranial drainage surgery.

[0004] There are two types of drainage catheters currently used in drainage surgery: single-lumen drainage catheters and multi-lumen drainage catheters. Figure 1 and Figure 2 As shown, the drainage end 101 of the single-lumen drainage catheter 100 is a blind end, and the non-drainage end 102 is an open end with no branches. During the subcutaneous sneaking of the single-lumen drainage catheter 100, the opening of the non-drainage end 102 of the single-lumen drainage catheter 100 is connected to the tail of the subcutaneous traction needle 200. After the drainage end 101 of the single-lumen drainage catheter 100 is successfully placed through the skull hole 301 of the patient's skull 300, the other end (non-drainage end 102) is moved away from the wound through a subcutaneous sneak operation, and the single-lumen drainage catheter 100 is led out through the subcutaneous tunnel exit 302 and fixed. The drainage end of the multi-lumen drainage catheter 400 is also a blind end, but the non-drainage end (tail end) of the multi-lumen drainage catheter has branches, and it is impossible to implant the catheter in the same way as a single-lumen drainage catheter. Reference Figure 3 As shown, because the non-drainage end (tail end) of the multi-lumen drainage catheter 400 already has a branched structure, it cannot be connected to a subcutaneous traction needle through the non-drainage end to pass through the subcutaneous tunnel. During subcutaneous insertion of the multi-lumen drainage catheter, the drainage end of the multi-lumen drainage catheter must first be inserted through the subcutaneous tunnel exit 302, then subcutaneously inserted to the cranial foramen 301 in the patient's skull 300. The multi-lumen drainage catheter 400 can then be bent and placed through the cranial foramen 301 into the target area to achieve the same effect.

[0005] Because the drainage end of a multi-lumen drainage catheter is blind and difficult to connect to a traction needle, implanting it presents significant operational difficulties. Without subcutaneous insertion, the current direct insertion method of a multi-lumen catheter increases the risk of infection. Furthermore, the tail of a multi-lumen drainage catheter cannot be properly fixed, increasing the likelihood of catheter displacement and potentially leading to drainage failure. Utility Model Content

[0006] In order to ensure the anti-infection effect during drainage surgery while reducing the difficulty of catheterization and reducing the damage caused to the patient, the present application provides a drainage catheter and drainage assembly.

[0007] In the first aspect, the drainage catheter provided in this application adopts the following technical solutions:

[0008] A drainage catheter comprises a tube body, one end of which is a drainage end and the other end is a non-drainage end; the drainage end of the tube body is closed and has a plurality of drainage holes on its outer circumference; the non-drainage end of the tube body is open; the tube body comprises a soft tube section and at least one hard tube section located at or near the non-drainage end.

[0009] This application provides a new drainage catheter for external cranial drainage, used in conjunction with a bone screw assembly. During use, the screw assembly is installed in the skull hole, and the drainage catheter is passed through the screw assembly. The rigid tube section is squeezed by the screw assembly to achieve fixation and sealing. This application introduces the drainage catheter through a hollow channel within the screw assembly, rather than through a subcutaneous route. This approach not only ensures effective infection prevention, but also greatly reduces the difficulty of catheter placement and minimizes patient trauma.

[0010] During the drainage catheter implantation surgery, a skull hole is first drilled at the entry point of the skull implantation path, and then the bone screw assembly with a hollow channel is fixed to the skull through the skull hole. The drainage catheter is then passed through the hollow channel of the bone screw assembly to reach the target area. When the drainage catheter is placed at the target position, the hard tube section of the drainage catheter is near the bone screw assembly. After screwing on the tail cap of the bone screw assembly, the hard tube section of the drainage catheter can be locked, and the sealing performance can be improved, reducing the risk of infection.

[0011] Conventional drainage catheters, made of soft materials, are easily squeezed and deformed when the end cap of the bone screw assembly is tightened, affecting drainage effectiveness and sealing, increasing the possibility of infection. The drainage catheter in this application completely overcomes this problem; furthermore, the drainage catheter in this application can be configured as either a single-lumen or multi-lumen drainage catheter.

[0012] Optionally, the length of the soft tube section is 20 to 120 mm, and the length of the hard tube section is 5 to 50 mm.

[0013] By adopting the above technical solution, the length of the flexible tube segment is longer than that of the rigid tube segment. The rigid tube segment is primarily used for interfacing with the bone screw assembly and does not need to be excessively long, while the flexible tube segment can reduce harm to the patient. The dimensions of the flexible tube segment and the rigid tube segment can meet the drainage catheterization needs of patients of different ages (and different head sizes). It is understood that in actual applications, a variety of drainage catheter models can be provided, with varying flexible tube segment and rigid tube segment lengths.

[0014] Optionally, the hose section is made of polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyvinyl chloride, nylon, polycarbonate, polyurethane or polytetrafluoroethylene; the hard pipe section is made of polycarbonate, polystyrene, polyformaldehyde or nylon, or the hard pipe section is made of modified polypropylene or polyethylene.

[0015] In this application, the hardness difference between the hard tube section and the soft tube section is ≥ 20A. Preferably, the hardness of the hard tube section is ≥ 90A. For example, the hard tube section can have a hardness of 90A and the soft tube section can have a hardness of 70A. By adopting the above technical solution, the soft tube section can be made of materials such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA, commonly known as organic glass), polyvinyl chloride (PVC), nylon (Nylon), polycarbonate (PC), polyurethane (PU), polytetrafluoroethylene (Teflon, PTFE), etc., which have high human compatibility. The hard tube section can be made of materials such as polycarbonate (PC), polystyrene (PS), polyoxymethylene (POM), nylon (PA), etc., or can be modified from materials with low hardness or rigidity, such as polypropylene (PP) and polyethylene (PE). These materials have excellent hardness and rigidity and are cost-effective.

[0016] Secondly, the drainage assembly provided by this application adopts the following technical solutions:

[0017] A drainage assembly comprises the above-mentioned drainage catheter and a bone screw assembly; the drainage catheter passes through the bone screw assembly and the hard tube section of the drainage catheter is located in the bone screw assembly and is squeezed by the bone screw assembly to achieve fixation and sealing.

[0018] By adopting the above technical solution, the drainage catheter passes through the hollow channel in the bone screw assembly instead of sneaking under the skin. This not only ensures the anti-infection effect, but also greatly reduces the difficulty of catheterization and reduces damage to the patient. At the same time, the hard tube section of the drainage catheter is limited and fixed by the bone screw assembly, effectively preventing the drainage catheter from loosening and displacement, and avoiding the bone screw assembly from squeezing the drainage catheter and causing deformation, thereby ensuring smooth drainage.

[0019] Optionally, as a first solution, the bone screw assembly includes a rod body and a tail cap, the middle part of the rod body has a first through hole that runs through both ends along its axial direction and is used for the drainage catheter to pass through, and the hole wall at one end of the first through hole has a conical guide surface with an inner diameter gradually decreasing from the end surface inward; the tail cap is screwed onto the end part of the rod body, and the tail cap has a deformation tube that extends into the first through hole and the hard tube section of the drainage catheter is passed through the deformation tube; the outer circumferential surface of the deformation tube cooperates with the conical guide surface and can make the deformation tube shrink and deform radially inward during the tightening of the tail cap to clamp the hard tube section of the drainage catheter.

[0020] By adopting the above technical solution, the drainage catheter passes through the first through hole and the deformable tube, and the hard tube section of the drainage catheter is located in the deformable tube; when the tail cap is spirally tightened, the deformable tube on the tail cap continues to extend into the first through hole, and under the guidance of the conical guide surface, the deformable tube shrinks and deforms radially inward to clamp the hard tube section of the drainage catheter, thereby limiting and fixing the hard tube section of the drainage catheter, effectively preventing the drainage catheter from loosening and displacement, and avoiding the bone screw assembly from squeezing the drainage catheter to ensure smooth drainage.

[0021] Optionally, as a second solution, the bone screw assembly includes a rod body and a tail cap, the middle part of the rod body has a first through hole that runs through both ends along its axial direction and is used for the drainage catheter to pass through, and the outer peripheral surface of one end of the rod body has an external thread; the tail cap is detachably fixed to the other end of the rod body, and an elastic sealing member is also provided between the tail cap and the rod body, the tail cap has a second through hole for the drainage catheter to pass through, and the elastic sealing member has a third through hole for the drainage catheter to pass through.

[0022] In this application, the rod of the bone screw assembly is installed in the skull hole, and the drainage end of the drainage catheter is passed through the first through-hole of the rod to reach the lesion. When the tail cap is installed, the elastic seal between the tail cap and the rod is squeezed, and the elastic seal contracts and squeezes the hard tube section of the drainage catheter, forming a seal, thereby isolating the operation and reducing the risk of infection. At the same time, the bone screw assembly effectively fixes the drainage catheter, preventing it from loosening and displacement.

[0023] Optionally, the bone screw assembly further comprises a rotating body, which is detachably connected to the rod body and is used to drive the rod body to rotate; the rotating body comprises a cylinder sleeved on the periphery of the rod body and a rotor located outside the cylinder; the cylinder cooperates with at least part of the outer contour of the rod body so that the rotating body can drive the rod body to rotate and screw the rod body into the skull hole.

[0024] By adopting the above technical solution, before installing the tail cap, the cylinder of the rotating body can be sleeved on the rod body; the cylinder and the rod body can be tightly fitted, and keyways and latch keys along the axial direction of the rod body can be provided between the cylinder and the rod body to achieve circumferential limitation, thereby facilitating the rotating body to drive the rod body to rotate and screw the rod body into the skull hole.

[0025] In the present application, after the rod body is installed and fixed, the rotating body can be removed, which reduces the volume of the medical device maintained on the patient's body during drainage, reduces the possibility of collision, and thus reduces accidental secondary injuries.

[0026] Optionally, as an alternative, a slot is provided on the outer peripheral surface of the middle portion of the rod body, and the rotating body is inserted into the slot.

[0027] By adopting the above technical solution, the assembly of the rotating body is facilitated.

[0028] Optionally, the tail cap is sleeved on the end of the rod body, a step groove is provided on the inner side of the end of the tail cap, the elastic seal is coaxially arranged with the tail cap and the elastic seal is embedded in the step groove, and when the tail cap is fixed to the rod body, the end face of the rod body rests on the side of the elastic seal.

[0029] By adopting the above technical solution, the end face of the rod body and the step groove wall of the tail cap jointly squeeze the elastic seal to cause it to deform, thereby forming a seal on the outer periphery of the hard tube section of the drainage catheter. The assembly is simple, the use is convenient, and the device is stable and reliable.

[0030] Optionally, the tail cap includes a cap body; a cylindrical inner cylinder is provided at the inner center of the end of the cap body, the inner cylinder is arranged along the central axis of the cap body, and the second through hole passes through both ends of the inner cylinder along the center line of the inner cylinder; the end of the rod body has a mounting hole that is coaxial and connected to the first through hole, the aperture of the mounting hole is larger than the aperture of the first through hole so that the bottom of the mounting hole forms a resting step surface, the elastic seal is located on the resting step surface, the inner cylinder extends into the mounting hole and the end face of the inner cylinder is pressed against the elastic seal.

[0031] By adopting the above technical solution, the end surface of the inner tube and the step surface in the rod body jointly squeeze the elastic seal to cause it to deform, thereby forming a seal on the outer periphery of the hard tube section of the drainage catheter, and the entire structure is stable and reliable.

[0032] Optionally, an annular clamping groove is provided on the inner side wall of the mounting hole close to the bottom of the hole, and the outer periphery of the elastic sealing component is embedded in the clamping groove.

[0033] By adopting the above technical solution, the elastic sealing member is arranged in the clamping groove, which effectively prevents the elastic sealing member from falling off.

[0034] Optionally, the inner wall of the cap body is threadedly connected or snapped to the outer circumference of the rod body; or the outer circumference of the inner cylinder is threadedly connected or snapped to the hole wall of the mounting hole inside the rod body.

[0035] By adopting the above technical solution, the tail cap and the rod body can be detachably connected, and the assembly is convenient.

[0036] Optionally, an annular protrusion is provided on the outer circumferential surface of the rod body, the cap body is sleeved on the end of the rod body, and a snap-fitting groove that snaps into engagement with the annular protrusion is provided on the inner wall of the cap body.

[0037] By adopting the above technical solution, the tail cap is engaged with the annular protrusion on the rod body through the engaging groove on the cap body, thereby realizing a detachable engagement between the tail cap and the rod body, which is convenient for assembly and disassembly and easy for operation. Of course, the engaging groove on the cap body and the annular protrusion on the rod body can also be interchanged to achieve the same function.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. The drainage catheter in this application is used for extracranial drainage and is used in conjunction with a bone screw assembly. The drainage catheter is led out through the hollow channel inside the bone screw assembly, rather than through the subcutaneous route. This not only ensures the anti-infection effect, but also greatly reduces the difficulty of catheterization and reduces damage to the patient.

[0040] 2. In this application, the hard tube section of the drainage catheter is limited and fixed by the bone screw assembly, which effectively prevents the drainage catheter from loosening and displacement, and at the same time avoids the bone screw assembly from squeezing the drainage catheter to cause a large deformation, thereby ensuring smooth drainage; the soft tube section can bend to adapt to the "drift" of the intracranial brain tissue to avoid scratching the brain tissue.

[0041] 3. In the present application, the rotating body is detachably connected to the rod body. After the rod body is installed and fixed, the rotating body can be removed, which reduces the volume of the medical device maintained on the patient's body during drainage, reduces the possibility of collision, and thus reduces accidental secondary injuries. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of an existing single-lumen drainage catheter in the background technology.

[0043] Figure 2 It is a schematic diagram of the use method of the existing single-lumen drainage catheter in the background technology.

[0044] Figure 3 It is a schematic diagram of the use method of the existing multi-lumen drainage catheter in the background technology.

[0045] Figure 4It is a structural schematic diagram of the drainage catheter in this application.

[0046] Figure 5 This is a schematic cross-sectional structural diagram of the bone screw assembly in Example 2 of the present application.

[0047] Figure 6 This is a schematic cross-sectional structural diagram of the bone screw assembly in Example 3 of the present application.

[0048] Figure 7 This is a schematic cross-sectional structural diagram of the bone screw assembly in Example 4 of the present application.

[0049] Figure 8 It is a schematic cross-sectional structural diagram of the bone screw assembly in Example 5 of the present application.

[0050] Figure 9 This is a schematic cross-sectional structural diagram of the bone screw assembly in Example 6 of the present application.

[0051] In the picture:

[0052] 100, single-lumen drainage catheter; 101, drainage end; 102, non-drainage end; 200, subcutaneous traction needle; 300, skull; 301, skull hole; 302, subcutaneous tunnel exit; 400, multi-lumen drainage catheter;

[0053] 10. Tube body; 11. Drainage hole; 12. Hose section; 13. Hard tube section;

[0054] 20. Bone screw assembly; 21. Rod body; 211. First through hole; 212. External thread; 213. Annular boss; 214. Snap-in groove; 215. Mounting hole; 216. Abutting step surface; 217. Snap-in groove; 218. Annular protrusion; 219. Conical guide surface; 22. Tail cap; 221. Second through hole; 222. Step groove; 223. Cap body; 2231. Snap-in groove; 224. Inner cylinder; 225. Deformation cylinder; 23. Rotating body; 231. Cylinder body; 232. Rotor; 24. Elastic sealing member; 241. Third through hole. DETAILED DESCRIPTION

[0055] The following is combined with Figure 4 -Attached Figure 9 , further details of this application are given.

[0056] Example 1

[0057] Reference Figure 4As shown, the drainage catheter in the present application includes a tube body 10, one end of the tube body 10 is a drainage end, and the other end is a non-drainage end; the drainage end face of the tube body 10 is closed and a plurality of drainage holes 11 are opened on the outer peripheral surface; the non-drainage end face of the tube body 10 is open; the tube body 10 includes a soft tube section 12 and at least one hard tube section 13 located at or near the non-drainage end, for example, there can be a hard tube section 13 between the two ends or even multiple sections of the soft tube section 12, so that at least one section of the tube body 10 has sufficient structural strength to be screwed and fixed at the bone screw assembly 20 , and does not significantly affect the drainage of the internal channel of the tube body 10; preferably, in the present application, the end of the tube body 10 close to the drainage end is a soft tube segment 12, and the end close to the non-drainage end is a hard tube segment 13. The soft tube segment 12 and the hard tube segment 13 can be integrally formed, or the soft tube segment 12 and the hard tube segment 13 made of different materials can be butt-jointed and then heat-welded; it is also possible to first make a soft tube as a whole, and then add a hard coating to the installation "section" corresponding to the bone screw assembly 20, or to transform the section of the tube body 10 into a "hard tube segment" through modification.

[0058] In this application, the length of the flexible tube segment 12 ranges from 20 to 120 mm, for example, 20 mm, 50 mm, 60 mm, 70 mm, 90 mm, 110 mm, etc.; the length of the rigid tube segment 13 ranges from 5 to 50 mm, for example, 5 mm, 28 mm, 35 mm, 40 mm, etc. The flexible tube segment 12 is typically longer than the rigid tube segment 13. The rigid tube segment 13 primarily mates with the bone screw assembly 20 and does not need to be excessively long. For example, the rigid tube segment 13 is only 5 mm long, precisely captured by a fastening feature within the bone screw assembly 20 (e.g., the center hole of the elastic seal), achieving both fixation and sealing. Furthermore, the flexible tube segment 12 can minimize damage to the patient (the position of brain tissue within the skull is not fixed; it "drifts" to a certain extent as the patient's recumbent position changes). The flexible tube segment 12 can bend to accommodate this "drift," preventing excessively rigid tubes from scratching the brain tissue). The dimensions of the flexible tube segment 12 and rigid tube segment 13 meet the drainage catheterization needs of patients of different ages (and different head sizes). It is understandable that in actual applications, various models of drainage catheters can be provided, with different lengths of the soft tube section 12 and the hard tube section 13 .

[0059] In this application, the hose segment 12 is made of materials such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA, commonly known as organic glass), polyvinyl chloride (PVC), nylon (Nylon), polycarbonate (PC), polyurethane (PU), and polytetrafluoroethylene (Teflon, PTFE), which are highly compatible with the human body. The hard tube segment 13 is made of materials such as polycarbonate (PC), polystyrene (PS), polyoxymethylene (POM), and nylon (PA). It can also be a modified material with low hardness or rigidity, such as polypropylene (PP) or polyethylene (PE), which exhibits excellent hardness and rigidity and offers a high cost-effectiveness. In this application, the hardness difference between the hard tube segment 13 and the hose segment 12 is ≥ 20A. Preferably, the hardness of the hard tube segment 13 is ≥ 90A. For example, the hardness of the hard tube segment 13 can be 90A, while the hardness of the hose segment 12 can be 70A.

[0060] The implementation principle is as follows: Combined Figure 5 As shown, the present application provides a new drainage catheter for extracranial drainage, which is used in conjunction with the bone screw assembly 20. The drainage catheter is led out through the hollow channel inside the bone screw assembly 20, rather than through the subcutaneous route. This not only ensures the anti-infection effect, but also greatly reduces the difficulty of catheterization and reduces damage to the patient.

[0061] During the drainage catheter implantation procedure, a skull hole is first drilled at the entry point of the skull implantation path. A bone screw assembly 20 with a hollow channel is then secured to the skull through the skull hole. The drainage catheter is then passed through the hollow channel of the bone screw assembly 20 to reach the target area. With the drainage catheter in place, the rigid tube section 13 of the drainage catheter is positioned adjacent to the bone screw assembly 20. Screwing on the tail cap 22 of the bone screw assembly 20 secures the rigid tube section 13 of the drainage catheter, improving sealing performance and reducing the risk of infection. Furthermore, the rigid tube section 13 of the drainage catheter is secured by the bone screw assembly 20, preventing the drainage catheter from being significantly deformed by squeezing by the bone screw assembly 20, thus ensuring smooth drainage.

[0062] If conventional drainage catheters are used directly, their soft material can easily cause them to be squeezed and deformed when the end cap 22 of the bone screw assembly 20 is tightened, affecting drainage effectiveness and sealing performance, increasing the possibility of infection. The drainage catheters in this application completely overcome this problem. While ensuring drainage effectiveness and sealing performance, they also secure the drainage tubes to prevent them from loosening or falling off. Furthermore, the drainage catheters in this application can be single-lumen or multi-lumen.

[0063] Example 2

[0064] Reference Figure 4 and Figure 5As shown, the drainage assembly provided by the present application includes a bone screw assembly 20 and the drainage catheter in the above-mentioned embodiment 1; the bone screw assembly 20 includes a rod body 21, a tail cap 22 and a rotating body 23, the middle part of the rod body 21 has a first through hole 211 that runs through both ends along its axial direction and is used for the drainage catheter to pass through, and the outer peripheral surface of one end of the rod body 21 has an external thread 212 for fastening to the skull hole; the rotating body 23 is connected to the outer periphery of the rod body 21 to drive the rod body 21 to rotate and fasten the rod body 21 to the skull hole; the tail cap 22 is detachably fixed to the other end of the rod body 21, and an elastic seal 24 is also provided between the tail cap 22 and the rod body 21, and the elastic seal 24 can be an O-type rubber gasket or a silicone gasket; the tail cap 22 has a second through hole 221 for the drainage catheter to pass through, and the elastic seal 24 has a third through hole 241 for the drainage catheter to pass through.

[0065] Reference Figure 5 As shown, the rotating body 23 is detachably connected to the rod body 21; the rotating body 23 includes a cylinder 231 sleeved on the outer periphery of the rod body 21 and a rotor 232 located on the outer side of the cylinder 231, and the cylinder 231 cooperates with at least part of the outer contour of the rod body 21 so that the cylinder 231 can drive the rod body 21 to rotate; the outer peripheral surface of the rod body 21 has an annular boss 213 that abuts against the end face of the cylinder 231 for limiting position; before installing the tail cap 22, the cylinder 231 of the rotating body 23 can be sleeved on the rod body 21, and the cylinder 231 abuts against the annular boss 213 on the outer peripheral surface of the rod body 21 to form an axial limit; the inner wall of the cylinder 23 can be a regular polygon, such as a square, a regular hexagon, etc., or the inner wall of the cylinder 23 is provided with an axial keyway or a key, and the shape of part of the outer contour of the rod body 21 cooperates with the shape of the inner wall of the cylinder 23, so that the rotating body 23 can drive the rod body 21 to rotate.

[0066] Reference Figure 5 As shown, the tail cap 22 is sleeved on the end of the rod body 21, and the tail cap 22 is threadedly connected or clamped to the outer circumference of the rod body 21; a step groove 222 is provided on the inner side of the end of the tail cap 22, and the elastic seal 24 is coaxially arranged with the tail cap 22 and the elastic seal 24 is embedded in the step groove 222. When the tail cap 22 is fixed to the rod body 21, the end face of the rod body 21 rests on the side face of the elastic seal 24; the end face of the rod body 21 and the wall of the step groove 222 of the tail cap 22 jointly squeeze the elastic seal 24, causing it to produce radial deformation, thereby forming a seal on the outer periphery of the hard pipe section 13 of the drainage catheter inserted into the inside of the rod body 21.

[0067] The implementation principle is as follows: In the present application, the rotating body 23 can be fixed to the rod body 21, or it can be a detachable connection. By adopting the above scheme, the rotating body 23 can be used to drive the rod body 21 to rotate, so that the rod body 21 can be screwed and fixed to the patient's skull, and then the drainage end of the drainage catheter passes through the bone screw assembly 20 to reach the lesion. When the tail cap 22 is installed, the elastic seal 24 between the tail cap 22 and the rod body 21 is squeezed, and the elastic seal 24 contracts and squeezes the hard tube section 13 of the drainage catheter to form a seal, thereby isolating the operation and reducing the risk of infection. At the same time, the bone screw assembly 20 plays a good fixing role on the drainage catheter, preventing the drainage catheter from loosening and displacement.

[0068] In the present application, after the rod body 21 is installed and fixed, the rotating body 23 can be removed, which reduces the volume of the medical device maintained on the patient's body during drainage, reduces the possibility of collision, and thus reduces accidental secondary injuries.

[0069] Example 3

[0070] Reference Figure 6 As shown, this embodiment is basically the same as Example 2, except that, in this embodiment, the tail cap 22 includes a cap body 223; a cylindrical inner cylinder 224 is provided at the inner center of the end of the cap body 223, and the inner cylinder 224 is arranged along the central axis of the cap body 223, and the second through hole 221 passes through both ends of the inner cylinder 224 along the center line of the inner cylinder 224; the inner wall of the cap body 223 is threadedly connected or snapped to the outer circumference of the rod body 21; or the outer circumference of the inner cylinder 224 is threadedly connected or snapped to the hole wall of the mounting hole 215 inside the rod body 21. The end of the rod body 21 has a mounting hole 215 that is coaxial with and connected to the first through hole 211. The aperture of the mounting hole 215 is larger than the aperture of the first through hole 211, so that the bottom of the mounting hole 215 forms abutting step surface 216, and the elastic seal 24 is located on the abutting step surface 216. The inner tube 224 extends into the mounting hole 215 and the end surface of the inner tube 224 is tightly pressed against the elastic seal 24; the end surface of the inner tube 224 and the step surface in the rod body 21 jointly squeeze the elastic seal 24, causing it to deform, thereby forming a seal on the outer periphery of the hard tube section 13 of the drainage catheter, and the entire structure is stable and reliable.

[0071] Example 4

[0072] Reference Figure 7 As shown, this embodiment is basically the same as embodiment 3, except that a slot 214 is provided on the middle outer peripheral surface of the rod body 21 in this embodiment, and the rotating body 23 is inserted into the slot 214, which facilitates the assembly of the rotating body 23.

[0073] At the same time, as a further improvement, an annular snap-fit ​​groove 217 is provided on the inner wall of the mounting hole 215 near the bottom of the hole, and the outer periphery of the elastic seal 24 is embedded in the snap-fit ​​groove 217. The elastic seal 24 is arranged in the snap-fit ​​groove 217, effectively preventing the elastic seal 24 from falling off from the rod body 21.

[0074] Example 5

[0075] Reference Figure 8 As shown, this embodiment is basically the same as embodiment 3 or embodiment 4, except that, in this embodiment, an annular protrusion 218 is provided on the outer circumference of the rod body 21, the cap body 223 is sleeved on the end of the rod body 21, and a snap-fitting groove 2231 is provided on the inner wall of the cap body 223 to engage with the annular protrusion 218. In this way, the tail cap 22 is snap-fitted with the annular protrusion 218 on the rod body 21 through the snap-fitting groove 2231 on the cap body 223, thereby achieving a detachable snap-fit ​​connection between the tail cap 22 and the rod body 21, making disassembly and assembly convenient and easy to operate. Of course, the positions of the snap-fitting groove 2231 on the cap body 223 and the annular protrusion 218 on the rod body 21 can also be interchanged to achieve the same function.

[0076] Example 6

[0077] Reference Figure 9 As shown, this embodiment is basically the same as Example 2, except that, in this embodiment, the bone screw assembly 20 includes a rod body 21 and a tail cap 22, the middle part of the rod body 21 has a first through hole 211 that runs through both ends along its axial direction and is used for the drainage catheter to pass through, and the hole wall at one end of the first through hole 211 has a conical guide surface 219 whose inner diameter gradually decreases from the end surface inward; the tail cap 22 is screwed onto the end of the rod body 21, and has a deformation tube 225 that extends into the first through hole 211 and the hard tube section 13 of the drainage catheter is passed through the deformation tube 225; the outer peripheral surface of the deformation tube 225 cooperates with the conical guide surface 219 and can make the deformation tube 225 shrink and deform radially inward during the tightening of the tail cap 22 to clamp the hard tube section 13 of the drainage catheter. The drainage catheter passes through the first through hole 211 and the deformable tube 225, and the hard tube section 13 of the drainage catheter is located in the deformable tube 225; when the tail cap 22 is spirally tightened, the deformable tube 225 on the tail cap 22 continues to extend into the first through hole 211, and under the guidance of the conical guide surface 219, the deformable tube 225 shrinks and deforms radially inward to clamp the hard tube section 13 of the drainage catheter, thereby limiting and fixing the hard tube section 13 of the drainage catheter, effectively preventing the drainage catheter from loosening and displacement, and at the same time avoiding the bone screw assembly 20 from squeezing the drainage catheter to cause a large deformation, thereby ensuring smooth drainage.

[0078] Furthermore, the deformable tube 225 is provided with a clearance groove extending axially inward from its end surface. The number of clearance grooves may be one, two, three, or more, and the multiple clearance grooves may be evenly spaced along the circumference of the deformable tube 225. This forms a claw structure on the deformable tube 225, facilitating its inward contraction and deformation, thereby gripping the rigid tube section 13 of the drainage catheter. The depth of the clearance groove may be half or one-third of the height of the deformable tube, thereby ensuring a tight seal between the rod body 21 and the tail cap 22.

[0079] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A drainage catheter, characterized in that: The invention comprises a tube body (10), one end of the tube body (10) being a drainage end and the other end being a non-drainage end; the drainage end face of the tube body (10) being closed and a plurality of drainage holes (11) being provided on the outer peripheral surface; the non-drainage end face of the tube body (10) being open; and the tube body (10) comprising a soft tube section (12) and at least one hard tube section (13) located at or near the non-drainage end.

2. The drainage catheter according to claim 1, characterized in that The drainage catheter is used in conjunction with the bone screw assembly (20). In a state of use, the bone screw assembly (20) is installed in the skull hole, the drainage catheter passes through the bone screw assembly (20), and the hard tube section (13) is squeezed by the bone screw assembly (20) to achieve fixation and sealing.

3. The drainage catheter according to claim 1 or 2, characterized in that: The length of the flexible pipe section (12) is 20 to 120 mm, and the length of the hard pipe section (13) is 5 to 50 mm.

4. A drainage component, characterized in that: It comprises a bone screw assembly (20) and a drainage catheter as described in any one of claims 1 to 3 above; in a state of use, the drainage catheter passes through the bone screw assembly (20) and the hard tube section (13) of the drainage catheter is located in the bone screw assembly (20) and is squeezed by the bone screw assembly (20) to achieve fixation and sealing.

5. The drainage assembly according to claim 4, characterized in that: The bone screw assembly (20) includes a rod body (21) and a tail cap (22), wherein the middle portion of the rod body (21) has a first through hole (211) extending through both ends along its axial direction and used for the drainage catheter to pass through, and a conical guide surface (219) with an inner diameter gradually decreasing from the end surface inward is provided on the hole wall at one end of the first through hole (211); the tail cap (22) is screwed onto the end portion of the rod body (21), and the tail cap (22) has a deformation tube (225) extending into the first through hole (211), and the hard tube section (13) of the drainage catheter is passed through the deformation tube (225); the outer peripheral surface of the deformation tube (225) cooperates with the conical guide surface (219) and can make the deformation tube (225) shrink and deform radially inward during the process of tightening the tail cap (22) to clamp the hard tube section (13) of the drainage catheter.

6. The drainage assembly according to claim 4, characterized in that: The bone screw assembly (20) includes a rod body (21) and a tail cap (22). The middle part of the rod body (21) has a first through hole (211) that runs through both ends along its axial direction and is used for the drainage catheter to pass through. The outer peripheral surface of one end of the rod body (21) has an external thread (212); the tail cap (22) is detachably fixed to the other end of the rod body (21), and an elastic sealing member (24) is also provided between the tail cap (22) and the rod body (21). The tail cap (22) has a second through hole (221) for the drainage catheter to pass through, and the elastic sealing member (24) has a third through hole (241) for the drainage catheter to pass through.

7. The drainage assembly according to claim 6, characterized in that: The invention also includes a rotating body (23), which is detachably connected to the rod body (21) and is used to drive the rod body (21) to rotate; the rotating body (23) includes a cylinder (231) sleeved on the outer periphery of the rod body (21) and a rotor (232) located outside the cylinder (231); the cylinder (231) cooperates with at least part of the outer contour of the rod body (21), so that the rotating body can drive the rod body (21) to rotate.

8. The drainage assembly according to claim 6, characterized in that: The tail cap (22) is sleeved on the end of the rod body (21), and a step groove (222) is provided on the inner side of the end of the tail cap (22). The elastic seal (24) is coaxially arranged with the tail cap (22) and embedded in the step groove (222). When the tail cap (22) is fixedly connected to the rod body (21), the end face of the rod body (21) abuts against the side face of the elastic seal (24).

9. The drainage assembly according to claim 8, characterized in that: The tail cap (22) comprises a cap body (223); a cylindrical inner cylinder (224) is provided at the inner center of the end of the cap body (223); the inner cylinder (224) is arranged along the central axis of the cap body (223); the second through hole (221) passes through both ends of the inner cylinder (224) along the center line of the inner cylinder (224); the end of the rod body (21) has a mounting hole (215) coaxial with and connected to the first through hole (211); the aperture of the mounting hole (215) is larger than the aperture of the first through hole (211), so that the bottom of the mounting hole (215) forms abutting step surface (216); the elastic sealing member (24) is located on the abutting step surface (216); the inner cylinder (224) extends into the mounting hole (215), and the end surface of the inner cylinder (224) is pressed against the elastic sealing member (24).

10. The drainage assembly according to claim 9, characterized in that: An annular clamping groove (217) is provided on the inner side wall of the mounting hole (215) near the bottom of the hole, and the outer periphery of the elastic sealing component (24) is embedded in the clamping groove (217).

11. The drainage assembly according to claim 9, characterized in that: An annular protrusion (218) is provided on the outer peripheral surface of the rod body (21), the cap body (223) is sleeved on the end of the rod body (21), and a snap-fitting groove (2231) that snap-fits with the annular protrusion (218) is provided on the inner wall of the cap body (223).

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