CN219089601U

CN219089601U - Femoral neck fixing screw and medical equipment

Info

Publication number: CN219089601U
Application number: CN202223017931.1U
Authority: CN
Inventors: 姚力军; 张桐滨; 诸楠; 张茜垚; 王凌
Original assignee: Ningbo Zhaoying Medical Instrument Co ltd
Current assignee: Ningbo Zhaoying Medical Instrument Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-05-30
Anticipated expiration: 2032-11-14

Abstract

The utility model relates to the technical field of medical equipment, in particular to a femoral neck fixing screw and medical equipment. The femoral neck fixing screw comprises a screw head and a screw rod, wherein an external thread is arranged on the screw rod, an inner hole penetrating through the length of the screw rod is formed in the inner side of the screw rod, a plurality of bone cement injection holes communicated with the inner hole are further formed in the screw rod, one end of the screw head is connected to one end of the screw rod, provided with the external thread, of the screw rod, an arc-shaped conical tip is formed at the other end of the screw head and used for self-drilling on a femoral neck, and the external thread can be screwed into the femoral neck. The arc-shaped conical tip is arranged on the head of the screw, so that the screw can be self-drilled on the femoral neck, and the screw can be screwed into the femoral neck while drilling, so that the treatment time is greatly shortened, and the treatment difficulty for osteoporosis and old patients is reduced. The medical equipment provided by the utility model comprises the femoral neck fixing screw, so that the treatment time can be shortened, and the treatment difficulty can be reduced.

Description

Femoral neck fixing screw and medical equipment

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a femoral neck fixing screw and medical equipment.

Background

The femoral neck is the part of the femoral head which is thinner at the outer lower part, and the fracture of the femoral head mainly refers to the fracture of the femoral neck. Many elderly people have reduced osteoporosis bone strength, and the upper femoral neck region has dense blood vessel nourishing holes, so that the biomechanical structure of the femoral neck is weakened, and the femoral neck is fragile, therefore, femoral neck fracture can occur without much violent force, such as sliding down on the ground, falling from a bed or suddenly twisting the lower limb, even without obvious trauma. The fracture of the femoral neck can be caused by accident or high drop injury in young and strong.

Wherein, femoral neck fixation screws are generally used for treating femoral neck fractures; however, because the femoral neck fixing screw in the prior art needs to be drilled and tapped by a special instrument when in use, and then the femoral neck fixing screw is inserted into the hole by the screw thread, the treatment steps are more, so that the treatment time is longer; in addition, because the bones of the osteoporosis and the old patients are relatively fragile, the treatment difficulty is easily increased by a treatment mode of firstly drilling holes and then inserting the femoral neck fixing screws.

Accordingly, there is a need to design femoral neck fixation screws and medical devices to ameliorate the above problems.

Disclosure of Invention

An object of the present utility model is to provide a femoral neck fixation screw that shortens the treatment time and reduces the difficulty of treatment.

In order to achieve the above object, the following technical scheme is provided:

a femoral neck fixation screw comprising:

the screw rod is provided with external threads, an inner hole penetrating through the length of the screw rod is formed in the inner side of the screw rod, and a plurality of bone cement injection holes communicated with the inner hole are further formed in the screw rod;

the screw head, the one end of screw head is connected to be provided with on the screw rod the one end of external screw thread, the other end of screw head is formed with the arc awl point, the arc awl point is used for from drilling on the femur neck.

Preferably, the screw head is provided with a plurality of inclined slopes, each inclined slope extends along a direction far away from the screw rod and obliquely towards an axis close to the screw rod, so that one end of each inclined slope is intersected to form the arc cone tip.

As a preferable scheme, a plurality of chip removal grooves for removing chips are further formed in the head of the screw, one end of each chip removal groove is connected with the inclined slope, the other end of each chip removal groove is connected to the external thread, and the plurality of chip removal grooves are circumferentially arranged on the periphery of the arc-shaped conical tip.

Preferably, the chip removal groove is an arc chip removal groove.

Preferably, the bone cement injection hole is positioned at a part of the screw rod provided with the external thread, and a plurality of bone cement injection holes are arranged at intervals.

Preferably, the femoral neck fixing screw further comprises:

the screw tail is connected to one end of the screw, which is not provided with the screw head, a countersink is arranged on the inner side of the screw tail and is communicated with the inner hole, the countersink is used for being connected with a bone cement injector, and the bone cement injector is used for providing bone cement for the inner hole.

Preferably, an internal thread is arranged on the inner side of the countersunk hole and is used for being in threaded connection with the bone cement injector.

As a preferable scheme, the cross section of the countersunk head hole is in a hexagonal star structure.

Preferably, the screw head, the screw rod and the screw tail are of an integrated structure.

It is another object of the present utility model to provide a medical device that includes a femoral neck fixation screw that reduces treatment time and difficulty.

medical apparatus, including bone cement syringes, further including femoral neck fixation screws as described above.

The utility model has the beneficial effects that:

the screw rod of the femur neck fixing screw is provided with external threads, the inner side of the screw rod is provided with an inner hole penetrating the length of the screw rod, bone cement is injected into the inner hole, and the screw rod is also provided with a plurality of bone cement injection holes communicated with the inner hole; one end of the head of the screw is connected to one end of the screw rod, which is provided with an external thread, the other end of the head of the screw forms an arc taper point, and the arc taper point can be used for self-drilling on the femoral neck so as to drive the external thread to screw into the femoral neck, thereby enabling bone cement in the inner hole to flow into the femoral neck through the bone cement injection hole so as to achieve the aim of treating the femoral neck by the bone cement; because set up the arc awl point and can carry out the self-drilling on the femoral neck to in can in the screw rod screw in femoral neck when boring, earlier carry out the drilling through special instrument in for prior art, attack the screw thread, then with the treatment mode in femoral neck set screw insertion femoral neck, reduced the treatment step, thereby can shorten treatment time, and reduce the treatment degree of difficulty to osteoporosis and old patient.

The medical equipment provided by the utility model comprises the femur neck fixing screw, so that the treatment time can be shortened, and the treatment difficulty can be reduced.

Drawings

Fig. 1 is a schematic structural view of a femoral neck fixing screw according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a femoral neck fixation screw provided in an embodiment of the present utility model;

fig. 3 is a schematic structural view of a screw tail according to an embodiment of the present utility model.

In the figure:

1. a screw head; 11. arc cone tip; 12. a chip removal groove; 13. slope;

2. a screw; 21. bone cement injection holes; 22. an external thread; 23. an inner bore;

3. a screw tail; 31. and (5) sinking the holes.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected or in communication; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., azimuth or positional relationship are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of operations, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

When the femoral neck fixing screw in the prior art is used, drilling and tapping are needed through a special instrument, and then the femoral neck fixing screw is inserted into the hole through the threads, so that the treatment steps are more, and the treatment time is longer; in addition, because the bones of the osteoporosis and the old patients are relatively fragile, the treatment difficulty is easily increased by a treatment mode of firstly drilling holes and then inserting the femoral neck fixing screws.

For this reason, in the present embodiment, there is provided a medical device including a bone cement injector and a femoral neck fixing screw capable of being implanted at a specific fracture site of a femoral neck to fix the fracture site; and bone cement can be provided for the femoral neck fixing screw through the bone cement injector, so that the bone cement in the femoral neck fixing screw can flow to the fracture part, and the aim of treating the femoral neck fracture is fulfilled.

Specifically, as shown in fig. 1 and 2, the femoral neck fixing screw includes a screw head 1 and a screw shaft 2; wherein, an external thread 22 is arranged on the outer peripheral surface of one end of the screw 2, an inner hole 23 penetrating the length of the screw 2 is arranged on the inner side of the screw 2, bone cement is injected into the inner hole 23, and a plurality of bone cement injection holes 21 communicated with the inner hole 23 are also arranged on the screw 2; and be provided with the one end of external screw thread 22 on being connected to screw rod 2 with the one end of screw head 1, be formed with arc awl point 11 at the other end of screw head 1, arc awl point 11 is used for carrying out from drilling on the femoral neck for external screw thread 22 can be in the automatic screw thread screw in femoral neck when from the drilling, thereby be provided with the part of external screw thread 22 in screw head 1 and the screw rod 2 and be connected to the femoral neck in, and then can make the bone cement in the hole 23 flow to the femoral neck in through bone cement injection hole 21, in order to realize bone cement and carry out the purpose of fracture treatment to the femoral neck.

Compared with the prior art, the femoral neck fixing screw changes the drilling mode of drilling into the femoral neck, can drill holes on the femoral neck by arranging the arc-shaped conical tip 11, and can screw the screw rod 2 into the femoral neck while drilling, and compared with the prior art, the femoral neck fixing screw is firstly drilled, tapped and threaded by a special instrument, and then the treatment mode of inserting the femoral neck fixing screw into the femoral neck is reduced, so that the treatment time can be shortened, and the treatment difficulty of osteoporosis and old patients can be reduced.

Further, as shown in fig. 1 and 2, a plurality of inclined slopes 13 are provided on the screw head 1, each inclined slope 13 extending obliquely in a direction away from the screw 2 and toward an axis direction closer to the screw 2 so that one end of each inclined slope 13 can intersect to form the above-mentioned arc-shaped taper 11. Here, the specific number of the arrangement and the shape structure of the inclined slopes 13 are not limited as long as it is ensured that the arc-shaped taper 11 for self-drilling can be formed by the respective inclined slopes 13.

By providing a plurality of inclined ramps 13, on the one hand, each inclined ramp 13 can be intersected to form an arc-shaped cone tip 11; on the other hand, the inclined slope 13 can be used for discharging bone fragments generated by the arc-shaped conical tip 11 in the self-drilling process.

As shown in fig. 1 and 2, a plurality of chip discharging grooves 12 for discharging chips are further provided on the screw head 1, one end of each chip discharging groove 12 is connected with the inclined slope 13, and the other end of each chip discharging groove 12 is connected with the external thread 22, so that bone chips generated by the arc-shaped conical tip 11 in the self-drilling process can be discharged out of the femur neck fixing screw through the inclined slope 13 and the chip discharging groove 12 in sequence; and a plurality of junk slots 12 week are established in the periphery of arc awl point 11, can realize carrying out circumference chip removal to the bone bits that arc awl point 11 bored to make the outside that the bone bits can discharge femur neck set screw sooner, thereby make the chip removal effect better, and then can avoid the bone bits to pile up and cause stress concentration and increase the risk of performing the operation and influence patient postoperative problem that resumes. In this embodiment, two junk slots 12 are provided, and the two junk slots 12 are disposed opposite to each other with respect to the arcuate cone tip 11. Of course, in other embodiments, the number of junk slots 12 may also be three, four, or more.

Further, the junk slots 12 are specifically arc-shaped junk slots, and compared with straight junk slots, the arc-shaped junk slots have larger arc-shaped junk spaces so as to discharge more bone fragments, thereby enabling better junk removal effects.

Specifically, as shown in fig. 1 and 2, each bone cement injection hole 21 is located at a portion of the screw 2 where the external thread 22 is provided, and a plurality of bone cement injection holes 21 are spaced apart and arranged in a straight line at a gap of the external thread 22; when the external thread 22 is screwed into the femoral neck, it is ensured that the bone cement in the inner hole 23 is smoothly injected into the preset fracture portion of the femoral neck. The clearance of the external thread 22 specifically refers to a position between two adjacent threads in the external thread 22. The bone cement injection hole 21 in this embodiment is provided with two. Of course, in other embodiments, the number of bone cement injection holes 21 may also be three, four, or more.

Further, as shown in fig. 1 to 3, the femoral neck fixing screw further comprises a screw tail 3, wherein the screw tail 3 is connected to one end of the screw rod 2, which is not provided with the screw head 1, a countersunk hole 31 is arranged on the inner side of the screw tail 3, the countersunk hole 31 is communicated with the inner hole 23, the countersunk hole 31 is used for being connected with a bone cement injector, and the bone cement injector is used for providing bone cement into the inner hole 23 of the screw rod 2; that is, the bone cement in the bone cement syringe can be injected into the inner bore 23 so that the bone cement in the inner bore 23 can flow to the fracture site in the femoral neck through the bone cement injection hole 21.

By communicating the counterbore 31 with the bore 23, on the one hand, the needle of the bone cement syringe can be passed through the counterbore 31 into the bore 23; on the other hand, the bone cement leaked into the counter bore 31 from the bone cement injector can directly flow into the inner bore 23, so that the waste of the bone cement is avoided.

Further, an internal thread is provided on the inner side of the counterbore 31 for threaded connection with the bone cement syringe, which facilitates the installation and removal of the bone cement syringe. Of course, in other embodiments, the bone cement injector may be snapped into place with the screw tail 3 or otherwise attached.

Specifically, as shown in fig. 3, the cross section of the countersunk hole 31 is in a hexagonal star structure, and the arrangement can enable the threaded connection between the bone cement injector and the internal thread of the countersunk hole 31 to be relatively tight, so that the connection between the bone cement fixing screw and the bone cement injector is more stable, and the risk of sliding teeth between the bone cement injector and the bone cement fixing screw in the operation process is reduced.

Furthermore, the screw head 1, the screw rod 2 and the screw tail 3 are of an integrated structure, so that on one hand, connecting pieces among all parts can be saved, the structure of the femur neck fixing screw is simpler, and the cost is lower; on the other hand, each part of the femur neck fixing screw is firmly connected, and the phenomenon that the operation effect is affected due to loose connection of each part is avoided.

Specifically, the length of the femoral neck fixing screw is 30 mm-100 mm, and in addition, the diameter of the screw rod 2 is 3.0 mm-6.5 mm, and the screw rod can be selected according to the age, bone condition, fracture condition and other adaptability of a patient.

Further, the material of the femoral neck fixing screw can be pure titanium, ti-6Al-4V, ti-5Al-2.5Fe or Ti-6Al-7Nb, and the like, preferably Ti-6Al-4V. Wherein Ti-6Al-4V, ti-5Al-2.5Fe or Ti-6Al-7Nb is one of titanium alloys.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The femoral neck set screw, its characterized in that includes:

the screw rod (2) is provided with external threads (22), an inner hole (23) penetrating through the length of the screw rod (2) is formed in the inner side of the screw rod (2), and a plurality of bone cement injection holes (21) communicated with the inner hole (23) are further formed in the screw rod (2);

the screw comprises a screw head (1), wherein one end of the screw head (1) is connected to one end of the screw rod (2) provided with the external thread (22), the other end of the screw head (1) is provided with an arc-shaped conical tip (11), and the arc-shaped conical tip (11) is used for self-drilling on a femoral neck, so that the external thread (22) can be screwed into the femoral neck.

2. The femoral neck fixation screw according to claim 1, wherein the screw head (1) is provided with a plurality of inclined ramps (13), each inclined ramp (13) extending obliquely in a direction away from the screw (2) and towards an axis closer to the screw (2) such that one end of each inclined ramp (13) intersects to form the arcuate cone tip (11).

3. The femoral neck fixation screw according to claim 2, characterized in that the screw head (1) is further provided with a plurality of junk slots (12) for junk removal, one end of the junk slots (12) is connected to the inclined ramp (13), the other end is connected to the external thread (22), and a plurality of junk slots (12) are circumferentially arranged on the outer periphery of the arc-shaped cone tip (11).

4. A femoral neck fixation screw according to claim 3, wherein the junk slots (12) are arcuate junk slots.

5. The femoral neck fixation screw according to any one of claims 1 to 4, wherein the bone cement injection hole (21) is located at a portion of the screw (2) where the external thread (22) is provided, and a plurality of the bone cement injection holes (21) are provided at intervals.

6. The femoral neck fixation screw of any one of claims 1 to 4, further comprising:

screw afterbody (3), be connected to be provided with on screw rod (2) the one end of screw head (1), the inboard of screw afterbody (3) is provided with countersink (31), countersink (31) with hole (23) intercommunication, countersink (31) are used for connecting the bone cement syringe, the bone cement syringe be used for to hole (23) provide bone cement.

7. The femoral neck fixation screw of claim 6, wherein the inside of the counterbore (31) is provided with internal threads for threaded connection with the bone cement injector.

8. The femoral neck fixation screw of claim 7, wherein the countersunk head (31) has a hexagonal cross-section.

9. The femoral neck fixation screw of claim 6, wherein the screw head (1), the shank (2) and the screw tail (3) are of an integrally formed construction.

10. Medical device comprising a bone cement injector, characterized in that it further comprises a femoral neck fixation screw according to any one of claims 1 to 9.