Sacroiliac joint intramedullary nail

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a sacroiliac joint intramedullary nail. The sacroiliac joint intramedullary nail comprises a nail body, a first locking piece, a second locking piece and a third locking piece, and the nail body is provided with an inserting hole; the nail body comprises a head part, a middle part and a tail part which are sequentially connected, a first connecting hole is formed in the head part, a second connecting hole is formed in the tail part, and a third connecting hole is formed in the middle part; the first locking piece penetrates through the first connecting hole, the second locking piece penetrates through the second connecting hole, and the third locking piece penetrates through the third connecting hole. During an operation, the sacroiliac joint intramedullary nail is arranged in the sacroiliac joint, surrounding soft tissue cannot be irritated, and fracture healing can be promoted. And the external fixing mechanism is inserted into the insertion hole of the nail body, so that the accuracy of the position of the nail body can be ensured, and the nail body can be temporarily supported. The multiple operation grooves are formed in the outer wall of the middle part at intervals, any operation groove can be selectively located at the bone fracture line according to the actual situation, and the flexibility and accuracy of surgical operation can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an intramedullary nail for the sacroiliac joint. Background Art

[0002] The sacroiliac joint is one of the largest joints in the human body, located at the rear of the pelvis, connecting the sacrum and the ilium. The stability of the sacroiliac joint is crucial for human movement and support. The separation of the sacrum and the ilium at the sacroiliac joint belongs to a type of pelvic fracture, and the incidence of this type of pelvic fracture is relatively high, and the treatment is also relatively complex.

[0003] At present, for the treatment of this type of pelvic fracture, bone plates, benders and screws are mainly used. Specifically, a bone plate is placed outside the sacrum and the ilium, and the bone plate is bent by a bender to meet the requirements of the connection positions of the two sides of the sacrum and the ilium, and then the two ends of the bone plate are respectively fixed to the sacrum and the ilium by screws. However, since the bone plate and the screws are both arranged outside the sacrum and the ilium, it will irritate the surrounding soft tissues, causing discomfort such as bulges, itching, etc. In addition, the bone plate is in direct contact with the periosteum outside the sacrum and the ilium, which may damage the periosteum, delay fracture healing, and slow down postoperative recovery. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an intramedullary nail for the sacroiliac joint, which will not irritate the surrounding soft tissues, cause discomfort such as bulges, itching, etc., can protect the integrity of the periosteum outside the bone, and can promote fracture healing. In addition, the fixing position is accurate, and the flexibility and accuracy of the surgical operation are relatively high.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An intramedullary nail for the sacroiliac joint, the intramedullary nail for the sacroiliac joint is configured to be arranged in the sacroiliac joint, and includes:

[0007] A nail body, the nail body is provided with an insertion hole; the nail body includes a head, a middle part and a tail connected in sequence, the head is provided with a first connection hole, the tail is provided with a second connection hole, the middle part is provided with a third connection hole, and a plurality of operation grooves are arranged at intervals on the outer wall of the middle part, and the operation grooves can be selectively located at the bone fracture line;

[0008] A first locking member, passing through the first connection hole, for fixing the head in the ilium;

[0009] A second locking member, passing through the second connection hole, for fixing the tail in the sacrum;

[0010] A third locking member, passing through the third connection hole, for fixing the middle part in the ilium or the sacrum.

[0011] In some possible embodiments, the angle between the end face of the head and the axis of the middle part is an acute angle.

[0012] In some possible embodiments, the third connection hole is an elongated hole.

[0013] In some possible embodiments, a spherical groove is provided at the opening of the elongated hole, and the third locking member can be in tight contact with the groove wall of the spherical groove.

[0014] In some possible embodiments, the third locking member includes a first screw head and a first screw post arranged in sequence. The first screw head is of a spherical structure, and the outer wall of the first screw post is provided with a first external thread; the first screw post passes through the third connection hole, and the first external thread is used for threaded connection with the ilium or the sacrum, and the first screw head can be in close contact with and against the spherical groove.

[0015] In some possible embodiments, among the plurality of operation grooves, at least two of the operation grooves form a group, and multiple groups of operation grooves are equidistantly distributed along the axial direction of the middle part. In each group of operation grooves, the operation grooves are equidistantly distributed along the circumferential direction of the middle part.

[0016] In some possible embodiments, the first locking member includes a second screw head and a second screw post arranged in sequence. The outer wall of the second screw head is provided with a second external thread, and the outer wall of the second screw post is provided with a third external thread; the inner wall of the first connection hole is provided with an internal thread, and the second external thread is in threaded connection with the internal thread; the third external thread is used for threaded connection with the ilium.

[0017] In some possible embodiments, the first locking member, the second locking member, and the third locking member are arranged in a staggered manner.

[0018] In some possible embodiments, the second locking member has the same structure as the first locking member.

[0019] In some possible embodiments, the insertion hole penetrates through the two end faces of the nail body along the axis direction of the nail body.

[0020] Advantages of the present utility model:

[0021] The intramedullary nail for the sacroiliac joint provided by the utility model comprises a nail body, a first locking member, a second locking member and a third locking member. When the intramedullary nail for the sacroiliac joint is arranged in the sacroiliac joint, it will not irritate the soft tissues around the sacrum and ilium, and the intramedullary nail for the sacroiliac joint does not contact the periosteum outside the sacrum and ilium, so that the fracture healing will not be delayed. On the basis that the first locking member and the second locking member fix the nail body, the middle part is fixed to the ilium or the sacrum through the third locking member, so that the pressure exerted by the nail body on the ilium or the sacrum is uniform, ensuring the stability of the nail body during use and promoting the initial healing of the entire fusion site. In addition, by inserting the external fixing mechanism into the insertion hole of the nail body and implanting the nail body into the sacroiliac joint, the accuracy of the fixing position of the nail body can be ensured, and when installing the first locking member, the second locking member and the third locking member, the external fixing mechanism plays a role of temporarily supporting the nail body. A plurality of operation grooves are arranged at intervals on the outer wall of the middle part, and any one of the operation grooves can be selectively located at the bone fracture line according to the actual situation, which can improve the flexibility and accuracy of the surgical operation. Description of the Drawings

[0022] Figure 1 is a schematic structural view of the intramedullary nail for the sacroiliac joint provided by the utility model;

[0023] Figure 2 is a schematic structural view of the first perspective of the nail body involved in the utility model;

[0024] Figure 3 is a schematic structural view of the second perspective of the nail body involved in the utility model;

[0025] Figure 4 is a schematic structural view of the third locking member involved in the utility model;

[0026] Figure 5 is a schematic structural view of the first locking member involved in the utility model.

[0027] In the figure:

[0028] 1, nail body; 11, insertion hole; 12, first connection hole; 13, second connection hole; 14, third connection hole; 141, spherical groove; 15, operation groove;

[0029] 2, first locking member; 21, second screw head; 22, second screw post; 23, second guiding cutting groove; 3, second locking member; 4, third locking member; 41, first screw head; 42, first screw post; 43, first guiding cutting groove. Detailed Embodiment

[0030] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0034] Such as Figure 1 and Figure 5As shown in the figure, the present utility model provides a sacroiliac joint intramedullary nail, which is applicable to minimally invasive reconstruction after separation of the sacrum and ilium at the sacroiliac joint, and is also applicable to the treatment of nonunion and malunion of the sacrum and ilium after surgery. The sacroiliac joint intramedullary nail is configured to be disposed within the sacroiliac joint, and includes a nail body 1, a first locking member 2, a second locking member 3, and a third locking member 4. The nail body 1 is provided with a plugging hole 11; the nail body 1 includes a head, a middle portion, and a tail portion connected in sequence. The head is provided with a first connection hole 12, the tail portion is provided with a second connection hole 13, the middle portion is provided with a third connection hole 14, and a plurality of operation grooves 15 are spaced on the outer wall of the middle portion. The operation grooves 15 can be selectively located at the bone fracture line; the first locking member 2 passes through the first connection hole 12 for fixing the head within the ilium; the second locking member 3 passes through the second connection hole 13 for fixing the tail portion within the sacrum; the third locking member 4 passes through the third connection hole 14 for fixing the middle portion within the ilium or the sacrum. In this embodiment, the third locking member 4 is used to fix the middle portion within the ilium. During the operation, an external fixing mechanism is plugged into the plugging hole 11 of the nail body 1, and the nail body 1 is implanted into the sacroiliac joint, and any one of the operation grooves 15 is selectively located at the bone fracture line. Then, the head is fixed to the ilium through the first locking member 2, the tail portion is fixed to the sacrum through the second locking member 3, and the middle portion is fixed to the ilium or the sacrum through the third locking member 4; thereafter, the broken bones are further surgically fixed at the bone fracture line through the operation groove 15. Disposing the sacroiliac joint intramedullary nail within the sacroiliac joint will not irritate the soft tissues outside the sacrum and ilium. The sacroiliac joint intramedullary nail does not contact the periosteum outside the sacrum and ilium, which helps to protect the periosteum and will not delay the fracture healing. On the basis of fixing the nail body 1 by the first locking member 2 and the second locking member 3, the middle portion is fixed to the ilium or the sacrum through the third locking member 4, so that the pressure exerted by the nail body 1 on the ilium or the sacrum is uniform, ensuring the stability of the nail body 1 during use and promoting the initial healing of the entire fusion site.

[0035] In addition, by plugging an external fixing mechanism into the plugging hole 11 of the nail body 1 and implanting the nail body 1 into the sacroiliac joint, the surgical wound surface is small, and the accuracy of the fixing position of the nail body 1 can be guaranteed. When installing the first locking member 2, the second locking member 3, and the third locking member 4, the external fixing mechanism plays a temporary supporting role for the nail body 1. A plurality of operation grooves 15 are spaced on the outer wall of the middle portion. According to the actual situation, any one of the operation grooves 15 can be selectively located at the bone fracture line, which can improve the flexibility and accuracy of the surgical operation.

[0036] During the operation, the nail body 1 can enter the sacrum from outside the sacrum and then be inserted into the ilium from inside the sacrum, positioning the nail body 1 within the sacroiliac joint. Optionally, in this embodiment, the angle between the end face of the head and the axis of the middle part is an acute angle. This arrangement facilitates the insertion of the nail body 1 from outside the sacrum into the sacrum and also from inside the sacrum into the ilium. Further, the first connection hole 12 penetrates the end face of the head, and the axis of the first connection hole 12 is perpendicular to the end face of the head, making the fixation more secure. Additionally, the first connection hole 12 can also penetrate the outer wall surface of the head. In other embodiments, the head is a conical structure or a pyramidal structure.

[0037] Optionally, in this embodiment, the nail body 1 is a cylindrical structure, which is simple to process and convenient to insert during the operation.

[0038] Optionally, the third connection hole 14 is an elongated hole, which facilitates adjusting the locking position of the third locking member 4 along the length direction of the elongated hole according to the actual situation, ensuring that the pressure exerted by the nail body 1 on the ilium or the sacrum is uniform and promoting the initial healing of the entire fusion site. Further, a spherical groove 141 is provided at the opening of the elongated hole, and the third locking member 4 can abut against the groove wall of the spherical groove 141. By providing the spherical groove 141, the locking direction of the third locking member 4 can be adjusted, better promoting the initial healing of the entire fusion site.

[0039] Further, as Figure 4 shown, the third locking member 4 includes a first screw head 41 and a first screw post 42 arranged in sequence. The first screw head 41 is a spherical structure, and the outer wall of the first screw post 42 is provided with a first external thread; the first screw post 42 penetrates the third connection hole 14, and the first external thread is used for threaded connection with the ilium or the sacrum, and the first screw head 41 can fit and abut against the spherical groove 141. This arrangement makes the force more uniform and will not damage the groove wall of the spherical groove 141. Optionally, a first guiding groove 43 is provided at the end of the first external thread. When the third locking member 4 is inserted into the third connection hole 14 and screwed into the ilium or the sacrum, the first guiding groove 43 plays a guiding role.

[0040] For convenient processing, as Figure 2 and Figure 3 shown, optionally, in this embodiment, among the multiple operation grooves 15, at least two operation grooves 15 form a group, and multiple groups of operation grooves 15 are equally spaced along the axial direction of the middle part. In each group of operation grooves 15, the operation grooves 15 are equally spaced along the circumferential direction of the middle part. The operation grooves 15 can be positioned at the bone fracture line by translating and rotating the nail body 1. In this embodiment, there are six operation grooves 15, two operation grooves 15 form a group, and three groups of operation grooves 15 are equally spaced along the axial direction of the middle part. In each group of operation grooves 15, the operation grooves 15 are equally spaced along the circumferential direction of the middle part.

[0041] In this embodiment, as Figure 5As shown, the first locking member 2 includes a second screw head 21 and a second stud 22 arranged in sequence. The outer wall of the second screw head 21 is provided with a second external thread, and the outer wall of the second stud 22 is provided with a third external thread; the inner wall of the first connection hole 12 is provided with an internal thread, and the second external thread is threadedly connected to the internal thread; the third external thread is used for threaded connection with the ilium. With such a setting, the fixation among the first locking member 2, the nail body 1, and the ilium is more stable. Optionally, a second guiding groove 23 is provided at the end of the third external thread. When the first locking member 2 is inserted into the first connection hole 12 and screwed into the ilium, the second guiding groove 23 plays a guiding role. In this embodiment, the second locking member 3 has the same structure as the first locking member 2 and has good interchangeability.

[0042] In this embodiment, the first locking member 2, the second locking member 3, and the third locking member 4 are staggeredly distributed, and the fixation of the nail body 1 is more reliable. In this embodiment, the insertion hole 11 penetrates through the two end faces of the nail body 1 along the axial direction of the nail body 1. According to the actual situation, the external fixing mechanism can be inserted into the insertion hole 11 from one end of the head of the nail body 1 or from one end of the tail of the nail body 1. Specifically, the external fixing mechanism includes a Kirschner wire, and the Kirschner wire is inserted into the insertion hole 11.

[0043] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A sacroiliac joint intramedullary nail, characterized in that, The sacroiliac joint intramedullary nail is configured to be disposed within the sacroiliac joint and includes: A nail body (1), the nail body (1) being provided with an insertion hole (11); the nail body (1) includes a head, a middle portion, and a tail portion that are sequentially connected, the head being provided with a first connection hole (12), the tail portion being provided with a second connection hole (13), the middle portion being provided with a third connection hole (14), and a plurality of operation grooves (15) being spaced apart on the outer wall of the middle portion, the operation grooves (15) being capable of selectively located at the bone fracture line; A first locking member (2), passing through the first connection hole (12) for fixing the head within the ilium; A second locking member (3), passing through the second connection hole (13) for fixing the tail portion within the sacrum; A third locking member (4), passing through the third connection hole (14) for fixing the middle portion within the ilium or the sacrum.

2. The intramedullary nail for the sacroiliac joint according to claim 1, wherein, The angle between the end face of the head and the axis of the middle portion is an acute angle.

3. The intramedullary nail for the sacroiliac joint according to claim 1, wherein, The third connection hole (14) is an elongated hole.

4. The intramedullary nail for the sacroiliac joint according to claim 3, characterized in that, A spherical groove (141) is provided at the opening of the elongated hole, and the third locking member (4) can be in tight contact with the groove wall of the spherical groove (141).

5. The intramedullary nail for sacroiliac joint according to claim 4, characterized in that, The third locking member (4) includes a first screw head (41) and a first screw post (42) that are sequentially arranged, the first screw head (41) being a spherical structure, and the outer wall of the first screw post (42) being provided with a first external thread; the first screw post (42) passes through the third connection hole (14), and the first external thread is used for threaded connection with the ilium or the sacrum, and the first screw head (41) can be in close contact with and press against the spherical groove (141).

6. The intramedullary nail for the sacroiliac joint according to claim 1, wherein, Among the plurality of operation grooves (15), at least two of the operation grooves (15) form a group, and multiple groups of the operation grooves (15) are equally spaced along the axial direction of the middle portion. In each group of the operation grooves (15), the operation grooves (15) are equally spaced along the circumferential direction of the middle portion.

7. The intramedullary nail for the sacroiliac joint according to claim 1, characterized in that, The first locking member (2) includes a second screw head (21) and a second screw post (22) that are sequentially arranged, the outer wall of the second screw head (21) being provided with a second external thread, and the outer wall of the second screw post (22) being provided with a third external thread; the inner wall of the first connection hole (12) is provided with an internal thread, and the second external thread is in threaded connection with the internal thread; the third external thread is used for threaded connection with the ilium.

8. The intramedullary nail for the sacroiliac joint according to any one of claims 1-7, characterized in that, The first locking member (2), the second locking member (3), and the third locking member (4) are arranged in a staggered manner.

9. The intramedullary nail for the sacroiliac joint according to any one of claims 1-7, characterized in that, The second locking member (3) has the same structure as the first locking member (2).

10. The intramedullary nail for the sacroiliac joint according to any one of claims 1-7, characterized in that, The insertion hole (11) penetrates through the two end faces of the nail body (1) along the axial direction of the nail body (1).

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