CN219557515U - External fixation self-tapping bone nail and bone nail system with drug delivery function - Google Patents

Abstract

The utility model discloses an external fixation self-tapping bone nail and a bone nail system with a drug delivery function, wherein the external fixation self-tapping bone nail comprises a bone nail rod and a bone nail tip; the bone nail tip lower extreme is provided with the external screw thread, and sealing connection can be dismantled with bone nail pole bottom to bone nail tip upper end, and bone nail tip is provided with vertical blind hole along the axial, and bone nail pole bottom is provided with along radial the conveying channel with vertical blind hole upper end intercommunication, and conveying channel includes internal thread section and the unthreaded hole section that communicates in proper order along bone nail pole lateral wall to vertical blind hole direction, and bone nail tip lower extreme radially is provided with a plurality of transverse holes with vertical blind hole lower extreme intercommunication. The bone nail adopts a combined structure, so that the length of the medicine injection hole is greatly shortened, the manufacturing difficulty can be effectively reduced, and the integral strength of the bone nail can be ensured.

Description

External fixation self-tapping bone nail and bone nail system with drug delivery function

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to an external fixation self-tapping bone nail and a bone nail system with a drug delivery function.

Background

The external fixing support has the characteristics of small wound, simple operation and firm fixation, so the external fixing support is widely applied to the treatment of open fracture, osteomyelitis, nonunion and complex fracture. However, tract infection is the most common complication of external stent fixation, and the infected fixation needle loses the fixation function after loosening, so that the fracture reduction is lost, and even chronic osteomyelitis occurs in serious cases. Because of the difficulty in delivering therapeutic drugs effectively to the site of infection, tract infections require cumbersome antiseptic care and are not easily treated.

In the prior art, in order to improve the efficiency of drug delivery during the infection of a nail tract, a patent entitled an external fixation hollow bone needle (CN 106580410A, 2017.04.26) with a tail cap and an injection hole for preventing infection proposes a bone needle penetrating through a hollow structure, so as to realize the injection of the drug without taking a nail. However, the large aspect ratio of the through hollow structure is extremely difficult and expensive to manufacture, and in addition, the through structure reduces the overall strength of the bone screw and increases the risk of breaking the screw during use.

Disclosure of Invention

Aiming at the problems, the utility model provides an external fixation self-tapping bone nail and a bone nail system with a drug delivery function, which adopts the following technical scheme:

an external fixation self-tapping bone nail comprises a bone nail rod and a bone nail tip; the bone screw comprises a bone screw rod, and is characterized in that an external thread is arranged at the lower end of the bone screw tip, the upper end of the bone screw tip is detachably and hermetically connected with the bottom of the bone screw rod, a vertical blind hole is formed in the bone screw tip along the axial direction, a conveying channel communicated with the upper end of the vertical blind hole is radially formed in the bottom of the bone screw rod, the conveying channel comprises an internal thread section and a light hole section which are sequentially communicated with the side wall of the bone screw rod along the direction of the vertical blind hole, and a plurality of transverse holes communicated with the lower end of the vertical blind hole are formed in the lower end of the bone screw tip along the radial direction.

Further, the external fixation self-tapping bone nail further comprises a connecting pin, the upper end of the bone nail tip is inserted into the bottom of the bone nail rod, and the bone nail rod is fixedly connected with the bone nail tip through the connecting pin.

Further, the bone screw rod comprises a first column body, a first conical transition section and a second column body which are sequentially connected from top to bottom;

the diameter of the second cylinder is larger than that of the first cylinder, the conveying channel is arranged on the second cylinder, an arc notch is formed in the upper end of the first cylinder along the circumferential direction, and an L-shaped notch is formed in the upper end of the first cylinder along the axial direction.

Further, the bone nail tip comprises a boss, a second conical transition section, a smooth section and an external thread section which are sequentially connected from top to bottom;

the vertical blind hole sequentially penetrates through the connecting boss, the second conical transition section and the smooth section to the middle part of the external thread section along the axial direction; the bottom of the second column is provided with a groove matched with the boss, the upper end of the groove is communicated with the unthreaded hole section of the conveying channel, and the lower end of the groove axially penetrates through the bottom of the second column.

Further, the boss comprises a third cylinder and a fourth cylinder, and the groove comprises a first round hole and a second round hole;

the upper end of the fourth cylinder is connected with the bottom of the third cylinder, the bottom of the fourth cylinder is connected with the upper end of the second conical transition section, the diameter of the fourth cylinder is larger than that of the third cylinder, a first step part is formed at the joint of the third cylinder and the fourth cylinder, and a second step part is formed at the joint of the fourth cylinder and the second conical transition section;

the first round hole upper end with unthreaded hole section intercommunication, first round hole lower extreme with second round hole upper end intercommunication, second round hole lower extreme runs through along the axial second post bottom, second round hole diameter is greater than first round hole, first round hole with second round hole junction forms the third step portion, first round hole diameter with third cylinder external diameter matches the setting, the second round hole diameter with fourth cylinder external diameter matches the setting.

Further, the external fixation self-tapping bone nail further comprises a sealing gasket, the sealing gasket is sleeved on the third column body, and the sealing gasket is used for forming sealing with the first step part and the third step part.

Further, a plurality of connecting pins are arranged, connecting blind holes which are in one-to-one correspondence with the connecting pins are formed in the fourth cylinder, the plurality of connecting blind holes are formed in the circumferential direction of the fourth cylinder, and each connecting blind hole is formed in the radial direction of the fourth cylinder;

the second cylinder is provided with the through-hole of connecting pin quantity one-to-one in second round hole position, a plurality of the through-hole is followed second cylinder circumference sets up, every the through-hole is followed second cylinder radial setting.

The utility model also provides a bone screw system with a drug delivery function, which comprises the external fixation self-tapping bone screw, a closed screw and an injection connecting pipe;

the sealing screw is connected with the internal thread section of the conveying channel and is used for sealing the conveying channel;

or one end of the injection connecting pipe is connected with the internal thread section of the conveying channel, and the other end of the injection connecting pipe is connected with the injector.

Further, the outer surface of the airtight screw is provided with a sealing coating.

Further, the injection connecting pipe comprises a threaded joint, a hose and a syringe joint which are connected in sequence;

and one end of the threaded joint is connected with the internal threaded section of the conveying channel, and one end of the injector joint is connected with the injector.

The utility model has the beneficial effects that: the bone nail can supply medicine into the bone through the middle hole according to actual needs; the bone nail adopts a combined structure, so that the length of the medicine injection hole is greatly shortened, the manufacturing difficulty can be effectively reduced, and the integral strength of the bone nail can be ensured. According to the bone screw system, the bone screw with the hole is connected with the airtight screw to achieve a sealing function under the condition of non-drug injection, and the bone screw with the hole and the drug injection connecting pipe achieve a drug function into bones under the condition of drug injection.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the structure of an external fixation self-tapping bone screw according to an embodiment of the present utility model;

FIG. 2 shows a cross-sectional view A-A according to FIG. 1;

FIG. 3 shows a partial enlarged view according to B in FIG. 2;

FIG. 4 illustrates a schematic view of an external fixation self-tapping bone screw installed on a bone in accordance with an embodiment of the present utility model;

FIG. 5 shows a schematic representation of a drug injection of a bone screw system with drug delivery according to an embodiment of the present utility model;

fig. 6 shows a schematic view of an injection connection tube structure according to an embodiment of the present utility model.

In the figure: 1. a bone screw rod; 2. bone nail tip; 3. an external thread; 4. a vertical blind hole; 5. a conveying channel; 6. an internal thread segment; 7. a light hole section; 8. a transverse hole; 9. a sealing gasket; 10. a first column; 11. a first tapered transition section; 12. a second column; 13. an arc-shaped notch; 14. an L-shaped notch; 15. a boss; 16. a second conical transition section; 17. a smooth section; 18. an external thread section; 19. a third column; 20. a fourth column; 21. a connecting pin; 22. connecting the blind holes; 23. a through hole; 24. sealing the screw; 25. a bone; 26. an injection connection pipe; 27. a syringe; 28. a threaded joint; 29. a hose; 30. a syringe connector.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the terms "first," "second," and the like herein are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein. In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings.

The embodiment of the utility model provides an external fixation self-tapping bone nail and a bone nail system with a drug delivery function, which can be applied to external fixation of bones, and the bone nail system adopts a combined structure, so that the length of a drug injection hole is greatly shortened, the manufacturing difficulty can be effectively reduced, and the overall strength of the bone nail can be ensured.

As shown in fig. 1 and 4, an external fixation self-tapping bone nail comprises a bone nail rod 1 and a bone nail tip 2, wherein the lower end of the bone nail tip 2 is provided with external threads 3, so that the functions of punching and fixing the bone nail tip 2 on a bone 25 are realized. The upper end of the bone nail tip 2 is detachably and hermetically connected with the bottom of the bone nail rod 1, and the sealing connection of the bone nail tip 2 and the bone nail rod 1 ensures the tightness of the medicine injection channel; as shown in fig. 2, the bone nail tip 2 is provided with a vertical blind hole 4 along the axial direction, and the vertical blind hole 4 is a medicine channel.

As shown in fig. 2 and 3, the bottom of the bone screw rod 1 is radially provided with a conveying channel 5 communicated with the upper end of the vertical blind hole 4, and the conveying channel 5 is used for conveying specific liquid medicine to the vertical blind hole 4; the conveying channel 5 comprises an internal thread section 6 and a unthreaded hole section 7 which are sequentially communicated and arranged along the side wall of the bone screw rod 1 towards the direction of the vertical blind hole 4, and the internal thread section 6 is used for being connected with other structures to realize the sealing or the medicine conveying of a medicine channel.

The lower end of the bone nail point 2 is radially provided with a plurality of transverse holes 8 communicated with the lower end of the vertical blind hole 4, for example, 1 transverse hole 8 can be arranged according to requirements, and 3 transverse holes 8 can be uniformly distributed along the circumference of the lower end of the bone nail point 2 when a plurality of transverse holes 8 are arranged, wherein the transverse holes 8 are used for conveying medicines into the bone 25, and the uniformly distributed transverse holes 8 can uniformly convey specific liquid medicines into the bone 25.

According to the external fixation self-tapping bone nail provided by the embodiment of the utility model, the bone nail rod 1 is of a solid structure, and the bone nail tip 2 is provided with the vertical blind hole 4 as a medicine channel, so that the length of a medicine injection hole is greatly shortened, the manufacturing difficulty can be effectively reduced, and the overall strength of the bone nail can be ensured.

In one embodiment, the upper end of the bone nail tip 2 is inserted into the bottom of the bone nail rod 1, the external fixation self-tapping bone nail further comprises a connecting pin 21, and the bone nail rod 1 and the bone nail tip 2 are fixedly connected through the connecting pin 21.

In one embodiment, as shown in fig. 1 and 2, the bone screw rod 1 comprises a first column body 10, a first conical transition section 11 and a second column body 12 which are sequentially connected from top to bottom, wherein the diameter of the second column body 12 is larger than that of the first column body 10, an arc-shaped notch 13 is formed in the upper end of the first column body 10 along the circumferential direction, an L-shaped notch 14 is formed in the upper end of the first column body 10 along the axial direction, and the arc-shaped notch 13 and the L-shaped notch 14 are used for connecting and fixing the bone screw rod 1 with other structures.

In one embodiment, the conveying channel 5 is arranged on the second column 12, and the conveying channel 5 is arranged on the second column 12 with the larger outer diameter, so that the strength of the bone screw rod 1 is ensured.

In one embodiment, as shown in fig. 2 and 3, the bone spike 2 includes a boss 15, a second conical transition section 16, a smooth section 17 and an external thread section 18 sequentially connected from top to bottom, and the blind hole 4 penetrates through the middle of the boss 15, the second conical transition section 16, the smooth section 17 to the external thread section 18 sequentially in the axial direction.

The bottom of the second column 12 is provided with a groove matched with the boss 15, the upper end of the groove is communicated with the unthreaded hole section 7 of the conveying channel 5, and the lower end of the groove axially penetrates through the bottom of the second column 12.

Further, as shown in fig. 3, the boss 15 includes a third column 19 and a fourth column 20, the upper end of the fourth column 20 is connected with the bottom of the third column 19, the bottom of the fourth column 20 is connected with the upper end of the second conical transition section 16, the diameter of the fourth column 20 is larger than that of the third column 19, a first step is formed at the connection position of the third column 19 and the fourth column 20, and a second step is formed at the connection position of the fourth column 20 and the second conical transition section 16.

The recess includes first round hole and second round hole, and first round hole upper end and unthreaded hole section 7 intercommunication, first round hole lower extreme and second round hole upper end intercommunication, second round hole lower extreme runs through second post 12 bottoms along the axial, and second round hole diameter is greater than first round hole, and first round hole and second round hole junction form third step portion, and first round hole diameter and third cylinder 19 external diameter match setting, second round hole diameter and fourth cylinder 20 external diameter match setting.

The external fixation self-tapping bone screw further comprises a sealing gasket 9, the sealing gasket 9 is sleeved on the third column body 19, the depth of the second round hole is set according to the length of the fourth column body 20 and the thickness of the sealing gasket 9, and when the boss 15 of the bone screw tip 2 is inserted into the groove of the bone screw rod 1, the sealing gasket 9 forms a seal with the first step part and the third step part, so that the tightness of the drug injection channel is ensured.

Further, the connecting pins 21 are provided in plurality, the fourth cylinder 20 is provided with connecting blind holes 22 corresponding to the connecting pins 21 in number one by one, the connecting blind holes 22 are uniformly distributed along the circumference of the fourth cylinder 20, each connecting blind hole 22 is radially arranged along the fourth cylinder 20, and the diameter of each connecting blind hole 22 is matched with the outer diameter of the connecting pin 21.

The second post 12 is provided with the through-hole 23 with connecting pin 21 quantity one-to-one in the second round hole position, a plurality of through-holes 23 are along second post 12 circumference equipartition, every through-hole 23 radially sets up along second post 12, the diameter of every through-hole 23 matches the setting with connecting pin 21 external diameter, boss 15 and the recess grafting of bone nail pole 1 of bone nail point 2, when the bottom and the second step butt of second post 12, pass through-hole 23, connect blind hole 22 with connecting pin 21 one end in proper order, realize the fixed connection of bone nail point 2 and bone nail pole 1.

As shown in fig. 4 and 5, based on the external fixation self-tapping bone screw, the embodiment of the present utility model further provides a bone screw system with a drug administration function, which includes the external fixation self-tapping bone screw, the airtight screw 24 and the injection connection tube 26.

Under the condition of non-drug injection, the airtight screw 24 is arranged in the internal thread section 6 of the side wall conveying channel 5 at the bottom of the bone screw rod 1, the airtight screw 24 is connected with the internal thread section 6 of the conveying channel 5, and when the airtight screw 24 is used for not injecting the drug, the conveying channel 5 is closed, the effect of isolating the drug injection channel from the outside is achieved, and pollutants such as bacteria are prevented from entering the bone 25; in the case of drug injection, the internally threaded section 6 of the delivery channel 5 is connected to one end of a drug injection connection tube 26, and the other end of the drug injection connection tube 26 is connected to a syringe 27 loaded with a specific liquid drug, enabling delivery of the drug into the bone 25.

In one embodiment, the outer surface of the airtight screw 24 is provided with a sealing coating, for example, the outer surface of the airtight screw 24 is coated with a biocompatible polymer material such as silicone rubber, polytetrafluoroethylene, etc., so that when the airtight screw 24 is connected with the external fixation self-tapping bone screw through the sealing coating, the sealing effect is better, and contaminants such as bacteria are prevented from entering the bone 25.

In one embodiment, as shown in fig. 6, the drug injection connection tube 26 includes a screw joint 28, a hose 29, and a syringe joint 30 connected in this order, one end of the screw joint 28 is connected to the female screw section 6 of the delivery channel 5, and one end of the syringe joint 30 is connected to the syringe 27.

In the case of drug infusion, the closing screw 24 is removed, the threaded joint 28 of the injection connection tube 26 is screwed into the internally threaded section 6 of the delivery channel 5, and the drug is delivered into the bone 25 via the unthreaded hole section 7, the blind vertical hole 4, the transverse hole 8 using the syringe 27.

Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. An external fixation self-tapping bone nail is characterized by comprising a bone nail rod (1) and a bone nail tip (2);

wherein, bone nail point (2) lower extreme is provided with external screw thread (3), bone nail point (2) upper end with sealing connection can be dismantled to bone nail pole (1) bottom, bone nail point (2) are provided with perpendicular blind hole (4) along the axial, bone nail pole (1) bottom along radial be provided with transport channel (5) of perpendicular blind hole (4) upper end intercommunication, transport channel (5) include along bone nail pole (1) lateral wall to perpendicular blind hole (4) direction internal screw thread section (6) and unthreaded hole section (7) that communicate in proper order, bone nail point (2) lower extreme along radial be provided with a plurality of transverse holes (8) of perpendicular blind hole (4) lower extreme intercommunication.

2. The external fixation self-tapping bone screw according to claim 1, further comprising a connecting pin (21), wherein the upper end of the bone screw tip (2) is inserted into the bottom of the bone screw rod (1), and the bone screw rod (1) and the bone screw tip (2) are fixedly connected through the connecting pin (21).

3. The external fixation self-tapping bone screw according to claim 2, characterized in that the bone screw rod (1) comprises a first cylinder (10), a first conical transition section (11) and a second cylinder (12) connected in sequence from top to bottom;

the diameter of the second cylinder (12) is larger than that of the first cylinder (10), the conveying channel (5) is arranged on the second cylinder (12), an arc-shaped notch (13) is formed in the upper end of the first cylinder (10) along the circumferential direction, and an L-shaped notch (14) is formed in the upper end of the first cylinder (10) along the axial direction.

4. The external fixation self-tapping bone screw according to claim 3, characterized in that the bone screw tip (2) comprises a boss (15), a second conical transition section (16), a smooth section (17) and an external thread section (18) connected in sequence from top to bottom;

the vertical blind hole (4) sequentially penetrates through the connecting boss (15), the second conical transition section (16) and the smooth section (17) to the middle part of the external thread section (18) along the axial direction; the bottom of the second cylinder (12) is provided with a groove matched with the boss (15), the upper end of the groove is communicated with the unthreaded hole section (7) of the conveying channel (5), and the lower end of the groove axially penetrates through the bottom of the second cylinder (12).

5. The external fixation self-tapping screw as in claim 4, wherein said boss (15) comprises a third cylinder (19) and a fourth cylinder (20), said recess comprising a first circular hole and a second circular hole;

the upper end of the fourth cylinder (20) is connected with the bottom of the third cylinder (19), the bottom of the fourth cylinder (20) is connected with the upper end of the second conical transition section (16), the diameter of the fourth cylinder (20) is larger than that of the third cylinder (19), a first step part is formed at the joint of the third cylinder (19) and the fourth cylinder (20), and a second step part is formed at the joint of the fourth cylinder (20) and the second conical transition section (16);

the first round hole upper end with unthreaded hole section (7) intercommunication, first round hole lower extreme with second round hole upper end intercommunication, second round hole lower extreme runs through along the axial second post (12) bottom, second round hole diameter is greater than first round hole, first round hole with second round hole junction forms third step portion, first round hole diameter with third cylinder (19) external diameter matching sets up, second round hole diameter with fourth cylinder (20) external diameter matching sets up.

6. The external fixation self-tapping bone screw as claimed in claim 5, further comprising a sealing washer (9), the sealing washer (9) being sleeved on the third column (19), the sealing washer (9) being adapted to form a seal with the first step and the third step.

7. The external fixation self-tapping bone screw according to claim 5 or 6, wherein a plurality of connecting pins (21) are provided, the fourth cylinder (20) is provided with connecting blind holes (22) corresponding to the number of the connecting pins (21) one by one, the plurality of connecting blind holes (22) are circumferentially arranged along the fourth cylinder (20), and each connecting blind hole (22) is radially arranged along the fourth cylinder (20);

the second cylinder (12) is provided with through holes (23) corresponding to the connecting pins (21) in number one by one in the second round hole position, a plurality of through holes (23) are circumferentially arranged along the second cylinder (12), and each through hole (23) is radially arranged along the second cylinder (12).

8. A bone screw system with drug delivery, characterized by comprising the external fixation self-tapping bone screw according to any one of claims 1-7, a closing screw (24) and an injection connection tube (26);

wherein the closing screw (24) is connected with the internal thread section (6) of the conveying channel (5), and the closing screw (24) is used for closing the conveying channel (5);

or, one end of the injection connecting pipe (26) is connected with the internal thread section (6) of the conveying channel (5), and the other end of the injection connecting pipe (26) is connected with a syringe (27).

9. The bone screw system with drug delivery of claim 8, wherein the exterior surface of the lag screw (24) has a sealing coating.

10. The bone screw system with drug delivery function according to claim 8, characterized in that the injection connection tube (26) comprises a threaded joint (28), a hose (29) and a syringe joint (30) connected in sequence;

wherein one end of the threaded joint (28) is connected with the internal threaded section (6) of the conveying channel (5), and one end of the syringe joint (30) is connected with the syringe (27).