Hollow nail for improving blood flow to the femoral head

Abstract

The present invention provides a hollow nail for improving blood flow to the femoral head, and relates to the technical field of medical devices. The hollow nail for improving blood flow to the femoral head comprises a nail body, a core shaft, a driving member and an umbrella-shaped structure; the outer wall of the nail body is provided with an external thread; a guide pin hole is provided on the core shaft; an annular cavity is provided in the nail body, the top of the annular cavity is an opening, and a plurality of channels are provided on the outer wall of the nail body, and the plurality of channels are connected with the annular cavity; an axial hole is provided in the nail body, both the core shaft and the driving member are inserted in the axial hole, the driving member is sleeved on the core shaft, one end of the umbrella-shaped structure is hinged on the core shaft, and the other end is hinged on the driving member; a first absorbable member is provided in the channel, and a second absorbable member for shielding the opening is provided on the umbrella-shaped structure. The technical effect of being able to improve the blood flow to the necrotic femoral head is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a hollow nail used for improving blood supply to the femoral head. Background Art

[0002] The course of aseptic necrosis of the femoral head includes the necrosis period, fragmentation period, reconstruction period and plastic period. Before the necrotic femoral head is completely reconstructed, most children may experience femoral head necrosis and collapse, leading to short femoral neck deformity, hip varus deformity, unequal length of lower limbs, early osteoarthritis, etc. At present, the treatment of this disease mainly includes conservative treatment, such as avoiding weight bearing, pain relief, brace treatment, etc.; and surgical treatment, such as plaster treatment, femoral varus osteotomy, pelvic osteotomy to increase the acetabulum's tolerance for the femoral head. However, neither conservative treatment nor surgical treatment can improve the blood supply of the necrotic femoral head, and therefore cannot change the natural course of femoral head necrosis and reduce the risk of femoral head necrosis collapse.

[0003] Existing treatments cannot improve the blood supply to the necrotic femoral head.

[0004] Therefore, providing a hollow nail for improving the blood supply to the necrotic femoral head has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a hollow nail for improving the blood supply to the femoral head, so as to alleviate the technical problem that the blood supply to the necrotic femoral head cannot be improved in the prior art.

[0006] In a first aspect, an embodiment of the present invention provides a hollow nail for improving blood supply to a femoral head, comprising a nail body, a core shaft, an umbrella-shaped structure, and a driving member for driving the umbrella-shaped structure;

[0007] The outer wall of the nail body is provided with an external thread;

[0008] A guide pin hole is provided on the mandrel;

[0009] An annular cavity is formed in the nail body, the top of the annular cavity is open, and a plurality of holes are formed in the outer wall of the nail body, and the plurality of holes are connected to the annular cavity;

[0010] An axial hole is formed in the nail body, the core shaft and the driving member are both inserted into the axial hole, the driving member is sleeved on the core shaft, one end of the umbrella-shaped structure is hinged on the core shaft, and the other end is hinged on the driving member;

[0011] A first absorbable component is arranged in the hole, and a second absorbable component for covering the opening is arranged on the umbrella-shaped structure.

[0012] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the driving member includes a sleeve and an adapter ring;

[0013] The sleeve is threadedly connected to the shaft hole, and the mandrel is threadedly connected to the sleeve;

[0014] The sleeve abuts against the adapter ring;

[0015] One end of the adapter ring away from the sleeve is hinged to the umbrella-shaped structure.

[0016] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein an annular groove is provided on the outer wall of the adapter ring, and a convex ring adapted to the annular groove is provided on the top of the sleeve;

[0017] The annular groove is slidably connected to the convex ring.

[0018] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein a first connecting seat for hinged connection with the umbrella-shaped structure is fixedly provided on the adapter ring.

[0019] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein an inner hexagonal groove is formed at one end of the sleeve away from the adapter ring.

[0020] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the umbrella-shaped structure includes a first connecting rod and a second connecting rod;

[0021] One end of the first connecting rod is hinged to the top of the core shaft, and the other end is hinged to the second connecting rod, and one end of the second connecting rod away from the first connecting rod is hinged to the first connecting seat;

[0022] The top of the mandrel is provided with a second connecting seat hinged to the first connecting rod;

[0023] An absorbable plate is arranged on the first connecting rod.

[0024] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the absorbable plate is made of tricalcium phosphate.

[0025] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the absorbable plate is made of polylactic acid.

[0026] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein an inner hexagonal groove is formed at one end of the core shaft away from the umbrella-shaped structure.

[0027] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein an inner hexagonal groove is formed at one end of the nail body away from the umbrella-shaped structure.

[0028] Beneficial effects:

[0029] The present invention provides a hollow nail for improving blood circulation of the femoral head, comprising a nail body, a core shaft, an umbrella-shaped structure and a driving member for driving the umbrella-shaped structure; an external thread is provided on the outer wall of the nail body; a guide pin hole is provided on the core shaft; an annular cavity is provided in the nail body, the top of the annular cavity is an opening, a plurality of channels are provided on the outer wall of the nail body, and the plurality of channels are connected to the annular cavity; an axial hole is provided in the nail body, both the core shaft and the driving member are inserted in the axial hole, the driving member is sleeved on the core shaft, one end of the umbrella-shaped structure is hinged on the core shaft, and the other end is hinged on the driving member; a first absorbable member is provided in the channel, and a second absorbable member for covering the opening is provided on the umbrella-shaped structure.

[0030] In specific use, before the operation, medical staff will measure the height of the necrotic epiphysis according to X-rays, CT or MRI, and select the appropriate size and length of the nail body to ensure that the umbrella-shaped structure on the nail body can completely enter the femoral epiphysis; during the operation, medical staff will insert the guide needle under fluoroscopy, expand the medullary cavity to the proximal growth plate of the femoral neck with an electric drill, and then screw the nail body into the necrotic epiphysis through the femoral neck. During the screwing process of the nail body, under the action of the pressure difference between the femoral neck bone marrow and the annular cavity on the nail body, the first absorbable component filled in the channel of the nail body will partially fall off and enter the annular cavity of the nail body, so that the femoral neck bone marrow enters the annular cavity of the nail body under the action of the pressure difference; then, under fluoroscopy, ensure that the umbrella-shaped structure of the nail body The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The first absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The second absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The second absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The second absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The second absorbable part and the second absorbable part are used to absorb the necrotic epiphysis. The second absorbable part is ... BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of a hollow nail for improving blood supply to the femoral head provided by an embodiment of the present invention when not in use;

[0033] Figure 2 A cross-sectional view of a hollow nail for improving blood supply to the femoral head provided by an embodiment of the present invention when not in use (wherein the second absorbable component is not shown);

[0034] Figure 3 A schematic diagram of a sleeve and an adapter ring for improving blood flow to the femoral head provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the hollow nail for improving blood supply to the femoral head provided by an embodiment of the present invention when in use;

[0036] Figure 5 A cross-sectional view of a hollow nail for improving blood supply to the femoral head provided by an embodiment of the present invention when not in use.

[0037] icon:

[0038] 100 - nail body; 110 - annular cavity; 111 - opening; 120 - channel; 130 - shaft hole;

[0039] 200 - mandrel; 210 - needle guide hole; 220 - second connecting seat;

[0040] 300 - driving member; 310 - sleeve; 311 - convex ring; 320 - adapter ring; 321 - ring groove; 322 - first connecting seat;

[0041] 400 - umbrella-shaped structure; 410 - first connecting rod; 420 - second connecting rod;

[0042] 500 - Second absorbable component. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0048] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, an embodiment of the present invention provides a hollow nail for improving blood supply to the femoral head, comprising a nail body 100, a core shaft 200, a driving member 300 and an umbrella-shaped structure 400; an outer wall of the nail body 100 is provided with an external thread; a guide pin hole 210 is provided on the core shaft 200; an annular cavity 110 is provided in the nail body 100, the top of the annular cavity 110 is an opening 111, and a plurality of channels 120 are provided on the outer wall of the nail body 100, and the plurality of channels 120 are connected to the annular cavity 110; an axial hole 130 is provided in the nail body 100, both the core shaft 200 and the driving member 300 are inserted in the axial hole 130, the driving member 300 is sleeved on the core shaft 200, one end of the umbrella-shaped structure 400 is hinged on the core shaft 200, and the other end is hinged on the driving member 300; a first absorbable member is provided in the channel 120, and a second absorbable member 500 for shielding the opening 111 is provided on the umbrella-shaped structure 400.

[0049] In specific use, before the operation, the medical staff will measure the height of the necrotic epiphysis according to X-rays, CT or MRI, and select the appropriate size and length of the nail body 100 to ensure that the umbrella-shaped structure 400 on the nail body 100 can completely enter the femoral epiphysis; during the operation, the medical staff will insert the guide needle under fluoroscopy, expand the medullary cavity with an electric drill and pass through the growth plate to the necrotic epiphysis, and then screw the nail body 100 into the femoral neck. During the screwing process of the nail body 100, under the action of the pressure difference between the femoral neck bone marrow and the annular cavity 110 on the nail body 100, the first absorbable component filled in the channel 120 of the nail body 100 will partially fall off and enter the annular cavity 110 of the nail body 100, so that the femoral neck bone marrow enters the annular cavity 110 of the nail body 100 under the action of the pressure difference; then, under fluoroscopy, the umbrella-shaped structure 400 of the nail body 100 is ensured. The structure 400 completely enters the necrotic epiphysis; then the medical staff drives the member 300 to drive one end of the umbrella-shaped structure 400 to move, so that the umbrella-shaped structure 400 on the top of the nail body 100 can be gradually opened. As the umbrella-shaped structure 400 opens, a temporary space is formed at the necrotic epiphysis, so that the bone marrow in the annular cavity 110 of the nail body 100 and the first absorbable member and the second absorbable member 500 can enter the necrotic epiphysis; at the same time, more channels 120 of the nail body 100 will be opened, and more bone marrow will enter the annular cavity 110 of the nail body 100 and enter the necrotic epiphysis; the bone marrow mesenchymal stem cells, growth factors, etc. in the bone marrow gradually differentiate into osteoblasts in the necrotic epiphysis, and gradually form osteocytes and bone tissue with the second absorbable member 500 as a scaffold, and crawl to replace the original necrotic tissue. Thereby improving the blood supply of the patient's necrotic femoral head and increasing the probability of recovery of the patient.

[0050] The outer wall of the second absorbable member 500 is provided with external threads, and when the umbrella-shaped structure 400 is contracted, the external threads of the outer walls of the plurality of second absorbable members 500 can be combined together, so that the external threads of the outer walls of the plurality of second absorbable members 500 are combined together. In addition, the top of the umbrella-shaped structure 400 is provided with a apex, and the outer wall of the apex is provided with external threads.

[0051] See also Figure 1 - Figure 5 As shown, in an optional scheme of this embodiment, the driving member 300 includes a sleeve 310 and an adapter ring 320; the sleeve 310 is threadedly connected to the axial hole 130, and the core shaft 200 is threadedly connected to the sleeve 310; the sleeve 310 abuts against the adapter ring 320; and the end of the adapter ring 320 away from the sleeve 310 is hinged to the umbrella-shaped structure 400.

[0052] Specifically, the medical staff drives the sleeve 310 to rotate through the screwdriver of the sleeve 310, and the screwdriver of the mandrel 200 can pass through the screwdriver of the sleeve 310 to connect with the mandrel 200, so that when the medical staff rotates the sleeve 310, the mandrel 200 will not move with the sleeve 310. Therefore, when the medical staff drives the sleeve 310 to open the umbrella-shaped structure 400, the umbrella-shaped structure 400 will not rotate, thereby reducing the harm to the patient.

[0053] Specifically, an inner hexagonal groove is formed at one end of the sleeve 310 away from the adapter ring 320, and the sleeve 310 can be driven to rotate by a hexagonal screwdriver.

[0054] Specifically, an inner hexagonal groove is formed at one end of the core shaft 200 away from the umbrella-shaped structure 400, and the core shaft 200 can be driven to rotate by a hexagonal screwdriver.

[0055] Specifically, an inner hexagonal groove is formed at one end of the nail body 100 away from the umbrella-shaped structure 400, and the nail body 100 can be driven to rotate by a hexagonal screwdriver.

[0056] See also Figure 1 - Figure 5 As shown, in an optional solution of this embodiment, an annular groove 321 is provided on the outer wall of the adapter ring 320, and a convex ring 311 adapted to the annular groove 321 is provided on the top of the sleeve 310; the annular groove 321 and the convex ring 311 are slidably connected.

[0057] Specifically, by opening a ring groove 321 on the adapter ring 320 and setting a convex ring 311 on the sleeve 310, the adapter ring 320 can move up and down synchronously with the sleeve 310 through the cooperation of the ring groove 321 and the convex ring 311, and the adapter ring 320 can rotate relative to the sleeve 310, so that when the sleeve 310 rotates up or down, the adapter ring 320 only completes the ascending and descending actions.

[0058] See also Figure 1 - Figure 5 As shown, in an optional solution of this embodiment, a first connecting seat 322 for hinged connection with the umbrella-shaped structure 400 is fixedly provided on the adapter ring 320 .

[0059] Specifically, a first connecting seat 322 is provided on the adapter ring 320 to facilitate the staff to assemble the umbrella-shaped structure 400 .

[0060] See also Figure 1 - Figure 5 As shown, in an optional scheme of this embodiment, the umbrella-shaped structure 400 includes a first connecting rod 410 and a second connecting rod 420; one end of the first connecting rod 410 is hinged to the top of the core shaft 200, and the other end is hinged to the second connecting rod 420, and the end of the second connecting rod 420 away from the first connecting rod 410 is hinged to the first connecting seat 322; a second connecting seat 220 hinged to the first connecting rod 410 is provided at the top of the core shaft 200; an absorbable plate is provided on the first connecting rod 410.

[0061] Specifically, by disposing the first connecting rod 410 and the second connecting rod 420 , the umbrella-like structure 400 can be folded and unfolded.

[0062] Specifically, after the medical staff uses a large screwdriver to screw the nail body 100 into the patient's femur, they use a small screwdriver with an axial hole 130 to connect it to the sleeve 310, and then insert another small screwdriver from the axial hole 130 and connect it to the core shaft 200. The medical staff then rotates the screwdriver connected to the sleeve 310. At this time, the sleeve 310 can rotate and rise in the axial hole 130 of the nail body 100, and the core shaft 200 will not rotate with the sleeve 310 under the fixation of the screwdriver. At this time, the sleeve 310 will rise relative to the core shaft 200, so that the sleeve 310 can push the adapter ring 320 to rise, and the adapter ring 320 pushes the first connecting seat 322 to rise, and then pushes the second connecting rod 420 of the umbrella-like structure 400 to rise, thereby driving the first connecting rod 410 to swing upward, so that the umbrella-like structure 400 can be unfolded, so that the second absorbable component 500 set on the first connecting rod 410 can support the necrotic part of the femoral head.

[0063] In an optional solution of this embodiment, the absorbable plate is made of tricalcium phosphate.

[0064] Specifically, the absorbable plate can be made of tricalcium phosphate.

[0065] In an optional solution of this embodiment, the absorbable plate is made of polylactic acid.

[0066] Specifically, the absorbable plate can be made of polylactic acid material.

[0067] In addition, those skilled in the art may also use other materials to make absorbable plates, as long as they can be absorbed by the human body after the operation and will not cause harm to the human body, which will not be elaborated here.

[0068] The hollow nail for improving blood supply to the femoral head provided in this embodiment can be used in the necrotic stage of aseptic necrosis of the femoral head. The femoral epiphysis in the necrotic stage is a soft necrotic tissue structure, which can better open the umbrella-shaped structure 400 at the top of the nail body 100. The purpose of early intervention and treatment can be achieved to avoid the collapse and flattening of the femoral head.

[0069] The method for using the hollow nail for improving femoral head blood supply provided in this embodiment is as follows: Step 1, measure the height of the necrotic epiphysis according to X-ray, CT or MRI before surgery, and select the appropriate size and length of the nail body 100, and ensure that the umbrella-shaped structure 400 of the nail body 100 can completely enter the femoral epiphysis.

[0070] Step 2: Make a small incision on the outer side of the proximal femur, insert a guide pin under fluoroscopy, and use an electric drill to expand the medullary cavity to the proximal growth plate of the bone neck.

[0071] Step 3. Select a large screwdriver to screw the nail body 100 as a whole into the necrotic epiphysis through the femoral neck. During the screwing process, due to the pressure difference between the femoral neck bone marrow and the annular cavity 110 of the nail body 100, the absorbable material filled in the channel 120 of the nail body 100 will partially fall off and enter the annular cavity 110 of the nail body 100, and the femoral neck bone marrow enters the annular cavity 110 of the nail body 100 under the action of the pressure difference.

[0072] Among them, the diameter and distribution density of the channel 120 of the nail body 100 must meet the following conditions: on the one hand, the diameter and distribution density of the channel 120 cannot be too large to affect the strength of the screw body 100 itself; on the other hand, it is also necessary to ensure that there are sufficient distribution and diameter of the channels 120 so that the bone marrow can smoothly enter the annular cavity 110 of the nail body 100 and enter the necrotic epiphysis.

[0073] Step 4: The nail body 100 is screwed into the necrotic epiphysis through the growth plate. The nail body 100 is screwed into the epiphysis as much as possible without penetrating the femoral head. Under fluoroscopy, ensure that the umbrella-shaped structure 400 on the nail body 100 completely enters the necrotic epiphysis.

[0074] Step 5: Use a small screwdriver to screw in the sleeve 310, and fix the mandrel 200 with another screwdriver, thereby gradually opening the umbrella-shaped structure 400 at the top of the nail body 100. At this time, as the bone marrow gradually enters the annular cavity 110, the pressure difference between the inside and outside of the umbrella-shaped structure 400 at the top of the nail body 100 decreases, and the resistance to screwing in the sleeve 310 will be significantly smaller. As the umbrella-shaped structure 400 opens, a temporary space is formed in the necrotic epiphysis, allowing the bone marrow and absorbable materials in the annular cavity 110 to enter the necrotic epiphysis; at the same time, more channels 120 of the nail body 100 will be open, and more bone marrow will enter the annular cavity 110 of the screw and enter the necrotic epiphysis.

[0075] Step 6: The mesenchymal stem cells, growth factors, etc. in the bone marrow gradually differentiate into osteoblasts in the necrotic epiphysis, and gradually form osteocytes and bone tissues with the second absorbable component 500 as a scaffold, crawling to replace the original necrotic tissue.

[0076] The annular cavity 110 of the nail body 100 can continuously attract the femoral neck bone marrow into the necrotic epiphysis, the umbrella-shaped structure 400 can increase the distribution of the bone marrow in the necrotic epiphysis and support the height of the necrotic epiphysis, and the second absorbable component 500 acts as a scaffold for stem cell crawling replacement.

[0077] Step 7: Check the X-rays regularly after the operation, and take out the metal part of the hollow nail for improving the blood supply to the femoral head provided in this embodiment according to the absorption of the umbrella-shaped structure 400 and the repair of the epiphysis.

[0078] In summary, the hollow nail for improving the blood supply to the femoral head provided in this embodiment can intervene in aseptic necrosis of the femoral head at an early stage, accelerate the reconstruction of the necrotic femoral head, and at the same time can better maintain the height of the necrotic femoral head.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hollow nail for improving blood flow to the femoral head, characterized in that: include: A nail body (100), a core shaft (200), an umbrella-shaped structure (400), and a driving member (300) for driving the umbrella-shaped structure (400); The outer wall of the nail body (100) is provided with an external thread; The core shaft (200) is provided with a needle guide hole (210); An annular cavity (110) is provided in the nail body (100), the top of the annular cavity (110) is an opening (111), the bottom of the annular cavity (110) is in a closed state, and a plurality of channels (120) are provided on the outer wall of the nail body (100), and the plurality of channels (120) are in communication with the annular cavity (110); An axial hole (130) is provided in the nail body (100), the core shaft (200) and the driving member (300) are both inserted into the axial hole (130), the driving member (300) is sleeved on the core shaft (200), one end of the umbrella-shaped structure (400) is hinged on the core shaft (200), and the other end is hinged on the driving member (300); A first absorbable component is arranged in the hole (120); when the nail body (100) is screwed into the femoral neck, under the action of the pressure difference between the bone marrow of the femoral neck and the annular cavity (110) on the nail body (100), the first absorbable component filled in the hole (120) of the nail body (100) will partially fall off and enter the annular cavity (110) of the nail body (100), thereby allowing the bone marrow of the femoral neck to enter the annular cavity (110) of the nail body (100) under the action of the pressure difference; The umbrella-shaped structure (400) is provided with a second absorbable component (500) for covering the opening (111); as the umbrella-shaped structure (400) is opened, a temporary space is formed at the necrotic epiphysis, so that the bone marrow in the annular cavity (110) of the nail body (100) and the first absorbable component and the second absorbable component (500) can enter the necrotic epiphysis; The driving member (300) comprises a sleeve (310) and an adapter ring (320); the sleeve (310) is threadedly connected to the shaft hole (130), and the core shaft (200) is threadedly connected to the sleeve (310); the sleeve (310) is in abutment with the adapter ring (320); an end of the adapter ring (320) away from the sleeve (310) is hingedly connected to the umbrella-shaped structure (400); An annular groove (321) is formed on the outer wall of the adapter ring (320), and a convex ring (311) adapted to the annular groove (321) is provided on the top of the sleeve (310); the annular groove (321) and the convex ring (311) are slidably connected.

2. The hollow nail for improving blood supply to the femoral head according to claim 1, characterized in that: A first connection seat (322) for being hingedly connected to the umbrella-shaped structure (400) is fixedly arranged on the adapter ring (320).

3. The hollow nail for improving blood supply to the femoral head according to claim 2, characterized in that: An end of the sleeve (310) away from the adapter ring (320) is provided with a hexagonal groove.

4. The hollow nail for improving blood supply to the femoral head according to claim 2, characterized in that: The umbrella-shaped structure (400) comprises a first connecting rod (410) and a second connecting rod (420); One end of the first connecting rod (410) is hinged to the top of the core shaft (200), and the other end is hinged to the second connecting rod (420); and one end of the second connecting rod (420) away from the first connecting rod (410) is hinged to the first connecting seat (322); A second connecting seat (220) hingedly connected to the first connecting rod (410) is provided at the top of the core shaft (200); An absorbable plate is provided on the first connecting rod (410).

5. The hollow nail for improving blood supply to the femoral head according to claim 4, characterized in that: The absorbable plate is made of tricalcium phosphate.

6. The hollow nail for improving blood supply to the femoral head according to claim 4, characterized in that: The absorbable plate is made of polylactic acid.

7. The hollow nail for improving blood supply to the femoral head according to any one of claims 1 to 6, characterized in that: An inner hexagonal groove is formed at one end of the core shaft (200) away from the umbrella-shaped structure (400).

8. The hollow nail for improving blood supply to the femoral head according to any one of claims 1 to 6, characterized in that: An end of the nail body (100) away from the umbrella-shaped structure (400) is provided with a hexagonal groove.

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