Bone needle assembly

Abstract

The utility model discloses a bone needle assembly. The bone needle assembly can comprise a bone needle and a partition sleeve piece, the partition sleeve piece comprises a connecting pipe and an expansion plate. The connecting pipe is of a hollow structure with two open ends and is used for being nested on the outer side of a bone needle. The connecting pipe and the expansion plate are integrated or split; when the connecting pipe and the expansion plate are in an integrated state, the extension direction of the expansion plate is parallel to the central axis of the connecting pipe; when the connecting pipe and the expansion plate are in a split state, a mounting part is arranged on the outer side of the connecting pipe, and the expansion plate is connected with the connecting pipe through the mounting part. The expansion plate in the partition suite blocks soft tissues such as skin and muscles around the bone needle, so that stress concentration is effectively prevented through the expansion plate, and the bone needle is prevented from pulling and even scratching the soft tissues.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a bone needle assembly. Background Art

[0002] A bone needle (with a diameter of about 4 mm) is required in orthopedic surgery. During the operation, the doctor nails the tip of the bone needle into the patient's bone as a "pillar" to block the surrounding skin, muscles or other soft tissues to reserve operating space or fix the bone. The structure of the bone needle in the prior art is as follows: Figure 1 This type of bone needle has the following disadvantages during surgery: on the one hand, the bone needle is too thin, and the tension of some tissue parts of the patient is very high during surgery, so the soft tissue pressure around the thin bone needle is very high, which often damages these tissues, such as directly damaging the gluteus medius muscle belly, which is the most important muscle around the hip joint; on the other hand, if the diameter of the bone needle is too large (too thick), the bone will be damaged during the nailing process, increasing the risk of stress fractures during subsequent operations. Utility Model Content

[0003] In order to effectively avoid stress concentration during the use of the bone needle and prevent the bone needle from straining or scratching important soft tissues such as the gluteus medius muscle, the utility model provides a bone needle assembly.

[0004] In a first aspect, an embodiment of the utility model provides a bone needle assembly, which may include: a bone needle and a baffle kit; the baffle kit may include: a connecting tube and an expansion plate; the connecting tube is a hollow structure with two ends open, and the connecting tube is used to be nested outside the bone needle;

[0005] The connecting pipe and the expansion plate are integrated or separated;

[0006] When the connecting tube and the expansion plate are integrated, the extension direction of the expansion plate is parallel to the central axis of the connecting tube;

[0007] When the connecting pipe and the expansion plate are in a separate state, a mounting portion is provided on the outer side of the connecting pipe, and the expansion plate is connected to the connecting pipe through the mounting portion.

[0008] In one embodiment, there is at least one mounting portion; when there are multiple mounting portions, the multiple mounting portions are distributed along the circumference of the connecting pipe.

[0009] In one embodiment, the mounting portion is a slot, and the long axis direction of the slot is parallel to the central axis of the connecting pipe;

[0010] The barrier kit may further include: buckles, which are arranged at two ends of the slot; the buckles are used to fix the expansion board when the expansion board is inserted into the slot.

[0011] In one embodiment, the mounting portion is a slide groove, one end of the slide groove is open, and when the connecting tube is nested outside the bone needle, the end of the slide groove opening is away from the tip of the bone needle.

[0012] In one embodiment, when the connecting tube and the expansion plate are integrated, the bone needle is provided with a plurality of first through holes distributed along the long axis direction of the bone needle, and the tube wall of the connecting tube is provided with a plurality of second through holes distributed along the long axis direction of the connecting tube; the bone needle assembly also includes: a first limit bolt respectively matching the first through hole and the second through hole.

[0013] In one embodiment, when the connecting tube and the extension plate are in a separate state, the bone needle is provided with a plurality of first through holes distributed along the long axis direction of the bone needle, and the tube wall of the connecting tube is provided with a plurality of second through holes distributed along the long axis direction of the connecting tube; the extension plate is provided with a plurality of third through holes respectively matching the first through holes and the second through holes; the bone needle assembly also includes: a second limit bolt respectively matching the first through hole, the second through hole and the third through hole.

[0014] In one embodiment, the outer side of the bone needle is provided with an external thread, the inner side of the connecting tube is provided with an internal thread, and the bone needle and the connecting tube are threadably connected.

[0015] In one embodiment, a protrusion is provided on the outer side of the bone needle, a depression is provided on the inner side of the connecting tube, and the bone needle and the connecting tube are clamped together by the protrusion and the depression.

[0016] In one embodiment, the expansion board may include a plurality of panels, and the plurality of panels are stacked in a thickness direction in an unexpanded state;

[0017] The plurality of panels are provided with first through holes along the thickness direction, and the bone needle assembly further comprises: a third stopper matched with the first through hole; when the plurality of panels are unfolded along the long axis direction of the connecting tube, the plurality of panels are fixed by the first through holes and the third stopper;

[0018] or,

[0019] A blind hole is provided on the end face of one of the panels away from the connecting tube, and a skirt is provided on the end face of the other panels away from the connecting tube. A second through hole matching the blind hole is provided on the skirt, and the bone needle assembly also includes: a fourth limiting bolt matching the blind hole and the second through hole; when the multiple panels are unfolded along the long axis direction of the connecting tube, the multiple panels are fixed by the blind hole, the second through hole and the fourth limiting bolt.

[0020] In one embodiment, the expansion board is a hollow structure or a solid structure.

[0021] In one embodiment, the bone needle assembly may further include: a nut, which is threadedly connected to a side of the bone needle away from the tip of the bone needle.

[0022] The beneficial effects of the above technical solution provided by the embodiment of the utility model include at least:

[0023] A bone needle assembly is provided in an embodiment of the utility model. The bone needle assembly does not change the overall structure of the bone needle (diameter, length, etc.). During use, the tip of the bone needle is nailed to the patient's bone for fixation. The barrier kit is sleeved on the bone needle, and by adjusting the position of the barrier kit, the expansion plate in the barrier kit is used to block the skin, muscles and other soft tissues around the bone needle, thereby effectively preventing stress concentration through the expansion plate, thereby preventing the bone needle from pulling or even scratching the soft tissue.

[0024] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.

[0025] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A structural diagram of a bone needle provided in the prior art;

[0028] Figure 2 This is an overall structural diagram of the bone needle assembly provided in an embodiment of the utility model;

[0029] Figure 3 It is a structural diagram of the baffle kit provided in the embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the slot structure connecting pipe structure provided in an embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of the connecting pipe structure of the chute structure provided in the embodiment of the utility model;

[0032] Figure 6 It is a structural diagram of the bone needle assembly and the baffle kit in the separated state in the embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of the structure of the raised portion on the bone needle and the recessed portion on the connecting tube in the embodiment of the utility model;

[0034] Figure 8 A structural diagram of the connection relationship between the bone needle and the barrier kit provided in an embodiment of the utility model;

[0035] Fig. 9 It is a structural diagram of various layout modes of the expansion board provided in the embodiment of the utility model;

[0036] Fig.10 A structural diagram of a bone needle and a nut provided in an embodiment of the utility model;

[0037] Among them, 1-bone needle assembly;

[0038] 11-bone needle; 12-blocking kit; 13-first limit bolt; 14-second limit bolt; 15-third limit bolt; 16-fourth limit bolt; 17-nut;

[0039] 111-tip; 112-first through hole; 113-external thread; 114-protrusion; 121-connecting tube; 122-expansion plate; 123-buckle;

[0040] 1211 -installation portion; 1212 -second through hole; 1213 -internal thread; 1214 -recess; 1221 -third through hole; 1222 -first panel; 1223 -second panel; 1224 -first through hole; 1225 -blind hole; 1226 -second through hole. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear" and the like indicate positions or positional relationships based on the positions 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The utility model provides a bone needle assembly, referring to Figure 2~Figure 10 As shown, the bone needle assembly 1 may include: a bone needle 11 and a barrier kit 12; the barrier kit 12 may include: a connecting tube 121 and an extension plate 122; the connecting tube 121 is a hollow structure with openings at both ends, and the connecting tube 121 is used to be nested on the outside of the bone needle 11; the connecting tube 121 and the extension plate 122 are integral or split; when the connecting tube 121 and the extension plate 122 are integral, the extension direction of the extension plate 122 is parallel to the central axis of the connecting tube 121; when the connecting tube 121 and the extension plate 122 are split, a mounting portion 1211 is provided on the outside of the connecting tube 121, and the extension plate 122 is connected to the connecting tube 121 via the mounting portion 1211.

[0045] The connecting tube 121 and the expansion plate 122 in the above-mentioned barrier kit 12 in the embodiment of the utility model can be made into two structures: an integrated structure and a split structure. When the connecting tube 121 and the expansion plate 122 are in an integrated structure, one end of the expansion plate 122 is fixed relative to the connecting tube 121, so that the position of the expansion plate 122 relative to the connecting tube 121 as a whole cannot be adjusted. Such an integrated structure is convenient for the installation of the barrier kit 12. After the barrier kit 12 is installed, the position of the expansion plate 122 is adjusted by adjusting the relative position between the connecting tube 121 and the bone needle 11. When the connecting tube 121 and the expansion plate 122 are in a split structure, the position of the expansion plate 122 at one end thereof relative to the connecting tube 121 is not fixed. Such a structure not only allows the position of the connecting tube 121 to be adjusted relative to the bone needle 11, but also allows the position of the expansion plate 122 to be adjusted relative to the connecting tube 121. By adjusting the relative position between the connecting tube 121 and the bone needle 11 and the relative position between the expansion plate 122 and the connecting tube 121, the position of the expansion plate 122 can be adjusted, thereby fixing the final position of the expansion plate 122 and achieving the shielding effect of the expansion plate 122 on soft tissues such as skin and muscles.

[0046] It should be noted that the expansion plate 122 in this embodiment is in the shape of a plate as a whole, and is located on the side of the connecting tube 121. In order to ensure that the bone needle 11 and the barrier kit 12 are subjected to balanced force during use, the connecting tube 121 can penetrate the expansion plate 122 in a vertically placed state, that is, when multiple expansion plates 122 are used, the center line of the connecting tube 121 coincides with the center line of the expansion plate 122. It should also be noted that the connecting tube 121 can be made of elastic rubber material or metal material, and the embodiment of the utility model does not specifically limit this.

[0047] The above-mentioned bone needle assembly 1 provided in the embodiment of the utility model does not change the overall structure (diameter, length, etc.) of the bone needle 11. During use, the tip 111 of the bone needle 11 is nailed to the patient's bone for fixation, and the barrier kit 12 is sleeved on the bone needle 11. By adjusting the position of the barrier kit 12, the expansion plate 122 in the barrier kit 12 is used to block the skin, muscles and other soft tissues around the bone needle 11, and then the expansion plate 122 is used to effectively prevent stress concentration, thereby preventing the bone needle 11 from pulling or even scratching the soft tissue.

[0048] In one embodiment, when the connecting tube 121 and the expansion plate 122 are separate, there is at least one mounting portion 1211; when there are multiple mounting portions 1211, the multiple mounting portions 1211 are distributed circumferentially along the connecting tube 121. In this embodiment, the position of the mounting portion 1211 can be one or multiple; when there is one mounting portion 1211, the position and orientation of the connecting tube 121 relative to the bone needle 11 can be adjusted to achieve the use of the expansion plate 122 to block the side with more soft tissue; when there are multiple mounting portions 1211, the expansion plates 122 can be installed on different mounting portions 1211 according to actual needs, and the parameters such as the size, size, and bending direction of the multiple expansion plates 122 can be the same, or different types of expansion plates 122 can be set according to the needs of soft tissue blocking, and the embodiment of the utility model does not specifically limit this.

[0049] In the embodiment of the utility model, by setting different numbers of mounting parts 1211, on the one hand, the processing of the connecting tube 121 device can be reduced for one mounting part 1211, thereby achieving the main blocking requirements; on the other hand, by setting multiple mounting parts 1211, multiple expansion boards 122 can be installed according to actual needs, thereby achieving flexible application of the expansion boards 122.

[0050] In another embodiment, referring to Figure 4 As shown, the mounting portion 1211 is a slot, and the long axis direction of the slot is parallel to the central axis of the connecting tube 121; the barrier kit 12 may also include: a clip 123, which is arranged at both ends of the slot; the clip 123 is used to fix the expansion board 122 when the expansion board 122 is plugged into the slot.

[0051] In this embodiment, a specific structure of the mounting portion 1211 is provided. In this embodiment, the mounting portion 1211 is set as a slot structure, that is, a slot is opened on the outer wall of the connecting tube 121, and the size of the slot is adapted to the size of one end of the extension plate 122 connected to the connecting tube 121. In this embodiment, after the connecting tube 121 is installed on the bone needle 11, the extension plate 122 is inserted into the slot of the connecting tube 121, and then the extension plate 122 is locked by the buckle 123 on the connecting tube 121. It should be noted that the buckle 123 in this embodiment is movably connected to both ends of the slot, and its material can be the same as that of the connecting tube 121, so as to facilitate cleaning and disinfection before use.

[0052] In another embodiment, referring to Figure 5As shown, the mounting portion 1211 is a slide groove, one end of which is open, and when the connecting tube 121 is nested outside the bone needle 11, the end of the slide groove opening is away from the tip 111 of the bone needle 11. The mounting portion 1211 in this embodiment is a slide groove structure, and the slide groove is an open groove opened on the outer wall of the connecting tube 121, that is, one end of the open groove is provided with an opening, so as to facilitate the insertion of the expansion plate 122 into the slide groove (the expansion plate 122 can slide along the central axis direction of the connecting tube 121).

[0053] In a specific implementation, a plurality of limiting holes (not shown in the figure) may be provided on the bottom surface of the slide groove so as to adjust the position of the extension plate 122 inserted into the slide groove according to actual needs. During orthopedic surgery, according to the position of soft tissues such as skin and muscle that need to be blocked, the extension plate 122 is slid to an appropriate position along the slide groove on the side of the connecting tube 121, and the limiting holes are used to fix the extension plate 122 so that the extension plate 122 blocks the soft tissue to prevent stress concentration. The slide groove structure connecting tube 121 provided in this embodiment is simple to groove, and no other parts need to be added, and the material of the connecting tube 121 does not need to be changed, which is convenient for installation and convenient for cleaning and disinfection.

[0054] In another embodiment, referring to Figure 6 As shown, when the connecting tube 121 and the extension plate 122 are integrated, the bone needle 11 is provided with a plurality of first through holes 112 distributed along the long axis direction of the bone needle 11, and the tube wall of the connecting tube 121 is provided with a plurality of second through holes 1212 distributed along the long axis direction of the connecting tube 121; the bone needle assembly 1 may also include: a first limit bolt 13 respectively matching the first through hole 112 and the second through hole 1212.

[0055] It should be noted that the first through hole 112 in this embodiment is perpendicular to the central axis of the bone needle 11, and the second through hole 1212 is perpendicular to the central axis of the connecting tube 121. The aperture of the first through hole 112 and the aperture of the second through hole 1212 match the outer diameter of the first limit bolt 13. In order to ensure stable limiting, there are at least two first limit bolts 13 in this embodiment, and the lateral length of the first limit bolt 13 inserted into the connecting tube 121 and the bone needle 11 is ≥ the radius of the connecting tube 121.

[0056] In another embodiment, referring to Figure 6As shown, when the connecting tube 121 and the extension plate 122 are in a split state, the bone needle 11 is provided with a plurality of first through holes 112 distributed along the long axis direction of the bone needle 11, and the tube wall of the connecting tube 121 is provided with a plurality of second through holes 1212 distributed along the long axis direction of the connecting tube 121; the extension plate 122 is provided with a plurality of third through holes 1221 respectively matching the first through holes 112 and the second through holes 1212; the bone needle assembly 1 may also include: a second limit bolt 14 respectively matching the first through hole 112, the second through hole 1212 and the third through hole 1221.

[0057] The difference between this embodiment and the above-mentioned embodiment is that the connection tube 121 and the expansion plate 122 in the integrated baffle kit 12 are directly connected together, and the position of the expansion plate 122 relative to the connection tube 121 is fixed; while the position of the expansion plate 122 relative to the connection tube 121 in the split baffle kit 12 is not directly fixed. In this embodiment, the positions of the connection tube 121 and the expansion plate 122 are fixed by the third through hole 1221 opened on the expansion plate 122, the first through hole 112 on the bone needle 11, the second through hole 1212 on the connection tube 121, and the second stop bolt 14. In order to ensure stable limit, there are at least two second stop bolts 14 in this embodiment, and the lateral length of the second stop bolt 14 inserted into the expansion plate 122, the connection tube 121 and the bone needle 11 is ≥ 1 / 2 of the lateral length of the expansion plate 122.

[0058] In another embodiment, referring to Fig. 9 As shown, the outer side of the bone needle 11 is provided with an external thread 113, the inner side of the connecting tube 121 is provided with an internal thread 1213, and the bone needle 11 and the connecting tube 121 are threadedly connected. The connecting tube 121 in this embodiment can be made of stainless steel material without elasticity, and the connecting tube 121 is connected to the bone needle 11 by threaded connection. In specific implementation, after the tip 111 of the bone needle 11 is nailed into the patient's bone, the connecting tube 121 is put on the bone needle 11 by rotating, and the expansion plate 122 located on the side of the connecting tube 121 is used to block the soft tissues such as skin and muscles around the bone needle 11; further, the connection method of the external thread 113 and the internal thread 1213 helps to stabilize the position of the expansion plate 122 relative to the bone needle 11.

[0059] In another embodiment, referring to Figure 7As shown, a protrusion 114 is provided on the outer side of the bone needle 11, and a recess 1214 is provided on the inner side of the connecting tube 121, and the bone needle 11 and the connecting tube 121 are clamped together by the protrusion 114 and the recess 1214. In this embodiment, in order to make the connection between the bone needle 11 and the connecting tube 121 more stable, another connection structure is provided, that is, by providing a protrusion 114 on the outer side of the bone needle 11 and a recess 1214 on the inner side of the connecting tube 121, and by adapting the protrusion 114 and the recess 1214, a stable connection between the connecting tube 121 and the bone needle 11 is achieved.

[0060] In another embodiment, referring to Figure 8 As shown, in this embodiment, when the expansion plate 122 has multiple panels, two panels (a first panel 1222 and a second panel 1223) are used as an example for explanation. The first panel 1222 and the second panel 1223 can be adjusted in the longitudinal direction, which helps to more fully block the surrounding soft tissues such as skin and muscles. Two adjustment methods are provided in the embodiment of the utility model. The first method is to open a hole in the thickness direction of the panel and fix it through a limit bolt, and the second method is to open a hole on the end surface of the panel and fix it through a limit bolt.

[0061] Reference Figure 8 As shown, the expansion plate 122 may include multiple panels, and the multiple panels are stacked in the thickness direction when not expanded; the multiple panels are provided with a first through hole 1224 along the thickness direction, and the bone needle assembly 1 may also include: a third limit bolt 15 matching the first through hole 1224; when the multiple panels are expanded along the long axis direction of the connecting tube 121, the multiple panels are fixed by the first through hole 1224 and the third limit bolt 15.

[0062] In another embodiment, referring to Figure 8 As shown, the expansion plate 122 includes a plurality of panels, and the plurality of panels are stacked in the thickness direction when not expanded; a blind hole 1225 is provided on the end face of one panel away from the connecting tube 121, and a skirt (not shown in the figure) is provided on the end face of the other panels away from the connecting tube 121, and a second through hole 1226 matching the blind hole 1225 is provided on the skirt. The bone needle assembly 1 may also include: a fourth limit bolt 16 matching the blind hole 1225 and the second through hole 1226; when the plurality of panels are expanded along the long axis direction of the connecting tube 121, the plurality of panels are fixed by the blind hole 1225, the second through hole 1226 and the fourth limit bolt 16. It should be noted that in this embodiment, the blind hole 1225 is provided on the panel close to the connecting tube 121, the second through hole 1226 is provided on the panel away from the connecting tube 121, and the panel provided with the skirt wraps the panel not provided with the skirt, that is, Figure 8 As shown, the outer diameter of the first panel 1222 is smaller than the outer diameter of the second panel 1223 , and the second panel 1223 is provided with a skirt to wrap the first panel 1222 .

[0063] In another embodiment, referring to Fig. 9 As shown, the expansion plate 122 can be a hollow structure or a solid structure. The expansion plate 122 in this embodiment can be a hollow structure or a solid structure. In order to reduce the load-bearing of the bone needle 11 during use, the expansion plate 122 with a hollow structure is preferably used in this embodiment. The actual shape of the expansion plate 122 can be a variety of shapes according to actual conditions, such as a flat plate shape, a curved shape, etc. Fig. 9 As shown in , the cross section of the expansion plate 122 can be arc-shaped, so that it can better fit or block the surrounding skin, muscles and other soft tissues. Fig. 9 As shown, the position of the expansion plate 122 relative to the connecting tube 121 can have various forms. Those skilled in the art can understand that the position of the expansion plate 122 relative to the connecting tube 121 can be arranged according to actual needs, and of course can also be adjusted according to surgical needs. The embodiment of the utility model does not make specific limitations on this.

[0064] In another embodiment, referring to Fig. 9 and Fig.10 As shown, the bone needle assembly 1 may further include: a nut 17, which is threadedly connected to the side of the bone needle 11 away from the tip 111 of the bone needle 11. The nut 17 in this embodiment is an operating head, which is convenient for nailing the bone needle 11 to the bone on one hand, and can limit the barrier kit 12 on the other hand to prevent the barrier kit 12 from falling off.

[0065] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A bone needle assembly, characterized in that: include: bone pins and spacer kits; The baffle kit comprises: a connecting tube and an expansion plate; the connecting tube is a hollow structure with two ends open, and the connecting tube is used to be nested outside the bone needle; The connecting pipe and the expansion plate are integrated or separated; When the connecting tube and the expansion plate are integrated, the extension direction of the expansion plate is parallel to the central axis of the connecting tube; When the connecting pipe and the expansion plate are in a separate state, a mounting portion is provided on the outer side of the connecting pipe, and the expansion plate is connected to the connecting pipe through the mounting portion.

2. The bone needle assembly according to claim 1, characterized in that: There is at least one mounting portion; when there are multiple mounting portions, the multiple mounting portions are distributed along the circumference of the connecting pipe.

3. The bone needle assembly according to claim 2, characterized in that: The mounting portion is a slot, and the long axis direction of the slot is parallel to the central axis of the connecting pipe; The baffle kit further includes: buckles, which are arranged at two ends of the slot; the buckles are used to fix the expansion board when the expansion board is inserted into the slot.

4. The bone needle assembly according to claim 2, characterized in that: The mounting portion is a slide groove, one end of which is open, and when the connecting tube is nested outside the bone needle, the open end of the slide groove is away from the tip of the bone needle.

5. The bone needle assembly according to any one of claims 1 to 4, characterized in that: When the connecting tube and the expansion plate are integrated, the bone needle is provided with a plurality of first through holes distributed along the long axis direction of the bone needle, and the tube wall of the connecting tube is provided with a plurality of second through holes distributed along the long axis direction of the connecting tube; the bone needle assembly further comprises: a first stopper respectively matched with the first through hole and the second through hole; or, When the connecting tube and the extension plate are in a separate state, the bone needle is provided with a plurality of first through holes distributed along the long axis direction of the bone needle, and the tube wall of the connecting tube is provided with a plurality of second through holes distributed along the long axis direction of the connecting tube; the extension plate is provided with a plurality of third through holes respectively matching the first through holes and the second through holes; the bone needle assembly also includes: a second limit bolt respectively matching the first through hole, the second through hole and the third through hole.

6. The bone needle assembly according to any one of claims 1 to 4, characterized in that: The outer side of the bone needle is provided with an external thread, the inner side of the connecting tube is provided with an internal thread, and the bone needle and the connecting tube are threadedly connected.

7. The bone needle assembly according to any one of claims 1 to 4, characterized in that: A convex portion is arranged on the outer side of the bone needle, a concave portion is arranged on the inner side of the connecting tube, and the bone needle and the connecting tube are clamped together through the convex portion and the concave portion.

8. The bone needle assembly according to any one of claims 1 to 4, characterized in that: The expansion board includes a plurality of panels, and the plurality of panels are stacked in the thickness direction in an unexpanded state; The plurality of panels are provided with first through holes along the thickness direction, and the bone needle assembly further comprises: a third stopper matched with the first through hole; when the plurality of panels are unfolded along the long axis direction of the connecting tube, the plurality of panels are fixed by the first through holes and the third stopper; or, A blind hole is provided on the end face of one of the panels away from the connecting tube, and a skirt is provided on the end face of the other panels away from the connecting tube. A second through hole matching the blind hole is provided on the skirt, and the bone needle assembly also includes: a fourth limiting bolt matching the blind hole and the second through hole; when the multiple panels are unfolded along the long axis direction of the connecting tube, the multiple panels are fixed by the blind hole, the second through hole and the fourth limiting bolt.

9. The bone needle assembly according to claim 8, characterized in that: The expansion board is a hollow structure or a solid structure.

10. The bone needle assembly according to any one of claims 1 to 4, characterized in that: The bone needle assembly further includes a nut, which is threadedly connected to a side of the bone needle away from the tip of the bone needle.

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