CN218338514U

CN218338514U - Screw tap and screw driver for orthopedic screws

Info

Publication number: CN218338514U
Application number: CN202221206416.5U
Authority: CN
Inventors: 陶虎; 雷伟; 柳克银; 冯亚非; 相庚
Original assignee: Jiangxi Sike Biotechnology Co ltd; Air Force Medical University of PLA
Current assignee: Jiangxi Sike Biotechnology Co ltd; Air Force Medical University of PLA
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2023-01-20
Anticipated expiration: 2032-05-18

Abstract

The utility model discloses an orthopedic screw is with screw tap and screwdriver. The disclosed screw tap comprises a screw tap head, a connecting rod, a handle part and a central hole. The screw tap is characterized in that the two ends of the screw tap are respectively provided with a head tooth part and a tail tooth part, the head tooth part and the tail tooth part are respectively provided with two chip grooves, and the screw tap is connected with the handle part through the connecting rod. The handle part is of a cylindrical structure and is provided with an anti-slip pad, so that clinical operation is facilitated. The screwdriver comprises a screwdriver head, a connecting rod, a handle part and a central hole. The screwdriver head is in a hexagonal plum blossom shape and can be matched with the degradable screw to prevent thread slipping. The connecting rod connects the screwdriver head with the handle portion. The handle part is of a cylindrical structure and is provided with an anti-slip pad, so that clinical operation is facilitated. The utility model has the characteristics of low in production cost, clinical convenient operation increases and reaches anti-skidding silk etc. with screw area of contact.

Description

Screw tap and screw driver for orthopedic screws

Technical Field

The utility model belongs to the technical field of medical instrument, a special tap of orthopedics screw and screwdriver of specific design.

Background

Metal internal fixation is always the gold standard for fracture surgery due to its excellent mechanical properties. However, the mechanical performance is not matched with human bones, and the defects of nondegradation, stress shielding, serious artifacts and the like exist at the same time. Compared with the traditional metal material, the biodegradable material has the unique advantages of good biocompatibility, good degradation speed, X-ray light transmittance and the like after being implanted into a human body.

However, there is still a certain difference in mechanical properties between the degradable material and the metal material, and especially, the degradable screw does not have the characteristic of convenient screwing in of the self-tapping screw, and the phenomenon of slipping and even breaking of the screw is very easy to occur in the screwing-in process of the screw, thereby further influencing the progress and the operation effect of the operation.

SUMMERY OF THE UTILITY MODEL

To the defect or not enough of prior art, the utility model provides an orthopedics is screw tap for screw.

Therefore, the screw tap for the orthopedic screw comprises a first handle part, a first connecting rod and a screw tap head which are sequentially arranged along the axial direction, and a first central hole is formed in the first handle part, the first connecting rod and the screw tap head along the axial direction; the screw tap head is matched with the orthopedic screw in shape;

the orthopedic screw comprises a screw body, wherein the screw body comprises a front section, a middle section and a rear section along the axial direction, the surface of the front section is provided with a front thread, the surface of the middle section is of a smooth structure, and the surface of the rear section is provided with a rear thread; the outer diameter of the rear section of the screw is the same as or larger than that of the front section; the number of turns of the thread of the rear thread is smaller than that of the front thread;

through holes are axially formed in the front section and the middle section, hollow holes are axially formed in the rear section, and the through holes are communicated with the hollow holes;

the hollow hole is used for accommodating a screwdriver.

Furthermore, a front chip groove is formed in the thread section, matched with the front thread, of the screw tap head, and a rear chip groove is formed in the thread section, matched with the rear thread, of the screw tap head.

Furthermore, the rear section external diameter is greater than the anterior segment external diameter, and the rear section external diameter is greater than the interlude external diameter, smooth transition or adoption conical surface transition between rear section and the interlude.

Further, the length of the screw is 10 mm-100 mm.

Furthermore, the outer diameter range of the screw is 1-10 mm, and the outer diameter of the rear section is 0.1-5 mm larger than that of the front section.

Further, the inner diameter of the through hole ranges from 0.1mm to 2mm.

Further, the axial length of the middle section accounts for 1% -60% of the total length of the screw, the axial length of the front section accounts for 10% -90% of the total length of the screw, and the axial length of the rear section accounts for 1% -30% of the total length of the screw.

Furthermore, the range of the thread circle of the front thread is 1-50, and the range of the thread depth is 0.1-3 mm.

Furthermore, the thread turn number range of the back thread is 1-20, and the thread depth range is 0.1-4 mm.

Furthermore, the posterior thread and the anterior thread both rotate clockwise, the starting point of the posterior thread is positioned on the extended thread of the anterior thread, and the starting point of the posterior thread deviates alpha degrees clockwise from the starting point of the anterior thread, wherein alpha is more than 0 and less than or equal to 90 degrees.

Furthermore, the front thread and the back thread are equidistant threads, and the thread pitch of the front thread is larger than that of the back thread.

Further, the thread pitch range of the front thread is 0.1-5 mm, and the thread pitch of the front thread is 0.05-0.5 mm larger than that of the rear thread.

Further, the cross section of the hollow hole is in a hexagonal plum blossom shape, a hexagonal shape or a square shape.

Further, the maximum inner diameter of the hollow hole is gradually reduced along the direction from the rear section to the front section.

Further, the screw driver comprises a second handle part, a second connecting rod and a screw driver head which are arranged along the axial direction, wherein a second central hole is formed in the second handle part, the second connecting rod and the screw driver head along the axial direction, and the screw driver head is matched with the hollow hole of the screw in shape.

The utility model discloses a screw tap can set up the nail way in advance, the screwdriver increase and screw area of contact and then avoid the emergence of smooth silk. The screw tap and the screw driver of the utility model are particularly suitable for the screws made of degradable materials, such as the screws made of fibroin.

Drawings

Fig. 1 is a diagram illustrating a structure of a tap according to an embodiment of the present invention.

Fig. 2 is an exemplary diagram of a tap head structure according to an embodiment of the present invention.

Fig. 3 is a schematic view of the internal structure of the tap shown in fig. 1.

Fig. 4 is a reference structure illustration of a screw in an embodiment of the present invention.

Fig. 5 is a schematic view of the internal structure of fig. 4.

Fig. 6 is a schematic view of the hollow bore structure of fig. 4.

Fig. 7 is a diagram illustrating a structure of a screw driver according to an embodiment of the present invention.

Fig. 8 is a schematic view of the internal structure of the screw driver shown in fig. 7.

Fig. 9 is a schematic view of the operation of the screw driver according to the embodiment of the present invention.

Fig. 10 is a schematic view of an internal structure of a screw driver head in operation according to an embodiment of the present invention.

Detailed Description

Unless otherwise specified, the terms or methods herein are understood or implemented using established methods as recognized by one of ordinary skill in the relevant art.

The terms of axial direction, middle direction, front direction, rear direction and orientation are consistent with the corresponding directions and orientations in the drawings, and it should be noted that the specific directions and orientations in the drawings are an example of the present invention, and those skilled in the art can make equivalent rotation, replacement and the like based on the disclosure in the present invention.

The utility model discloses a screw driver and screw tap can be made with materials such as stainless steel, alloy of using.

Example 1:

as shown in fig. 1-3, the tap of this embodiment includes a first handle portion 1, a first connecting rod 2, and a tap head 3, which are sequentially arranged along an axial direction, and a first central hole 4 through which a kirschner wire can conveniently pass is axially formed in the first handle portion, the first connecting rod, and the tap head; the size and shape of the tapping head are matched with those of the screw structure shown in fig. 4, the screw is made of fibroin, the structure of the screw is shown in fig. 4-6, the screw comprises a screw body, the screw body is composed of a front section d, a middle section c and a rear section a, wherein the surface of the front section is provided with a front thread, the rear section is provided with a rear thread, the middle section is smooth, a through hole e is formed in the front section and the middle section, a hollow hole b with a hexagonal quincuncial cross section (namely, on the basis of a regular hexagon, each side is an arc line inwards concave towards the center) is formed in the rear section, the hollow hole is axially communicated with the through hole, and the screw is matched with the shape of the screw, namely, as shown in fig. 2, the two ends of the tapping head 3 are respectively provided with a head tooth part 33 and a tail tooth part 32 which are matched with the front thread and the rear thread.

A specific example, in this embodiment, the screw length is 30mm, the rear section length is 15% of the screw length, the middle section length accounts for 40% of the total length, the middle section outer diameter is 3mm, the front section outer diameter is 4mm, the rear section outer diameter is 6mm, both the front thread and the rear thread rotate clockwise, the starting point of the rear thread a (indicated by an arrow in fig. 4) is not on the extension line of the front thread, and the starting point of the rear thread is not deviated in the clockwise direction from the starting point of the front thread, both the front thread and the rear thread are equally spaced threads, the front thread spacing is 1.8mm, the number of threads is 7, the rear thread spacing is 1.8mm, the number of threads is 3, and the depth of the front thread is 0.5mm; the depth of the subsequent thread is 0.3mm, the diameter of the through hole e is 1.5mm, the diagonal length of the hollow hole b is 2mm, and the depth is 3mm. The hexagonal plum blossom shape can increase the contact area with the matched screwdriver head and prevent thread slipping. In a further preferred scheme, the maximum inner diameter of the hollow hole is gradually reduced along the direction from the rear section to the front section.

In a further preferable scheme, the head tooth part 33 matched with the front thread is provided with a front chip groove 34 along the axial direction, and the tail tooth part 31 matched with the back thread is provided with a back chip groove 32 along the axial direction, so that bone chips can be discharged conveniently.

Fig. 7 and 8 are schematic diagrams of the screw driver according to the embodiment, the screw driver includes a handle portion 5, a connecting rod 6 and a screw driver head 7, which are sequentially arranged along an axial direction, and a central hole 8 for facilitating a passing of a kirschner wire is axially formed in the handle portion 5, the connecting rod 6 and the screw driver head 7; the shape of the screwdriver head is matched with that of the hollow hole of the screw, and the screwdriver head is preferably in a hexagonal plum blossom shape, so that the contact area with the screw can be increased, and the risk of thread slipping is reduced. More preferably, the maximum outer diameter of the screwdriver head gradually decreases in the direction from the rear section of the screw to the front section of the screw.

When the screw is used, the opening is tapped, the guide wire is placed into the opening, the guide wire penetrates through the through hole and the hollow hole, the screwdriver is inserted into the hollow hole of the screw (as shown in figures 9 and 10), the screw is screwed into bone tissue along the guide wire, the front thread is connected with the bone tissue, and the rear thread can be used for forming embedding with the outer cortex of the bone to prevent withdrawal. Specific use examples:

selecting a 8-month-old small-tail Han sheep, and injecting intramuscular fast-sleeping new II to obtain good anesthesia at the concentration of 0.1 ml/kg; fixing the anesthetized sheep on the left side on an operating table, sterilizing and spreading a sheet, making a 5cm transverse incision at the external humeral condyle, sequentially cutting skin, subcutaneous tissues and fascia, exposing the articular surface of the humeral pulley through the gap between triceps brachii and brachioradialis, and carefully stripping periosteum by using a periosteum stripper to expose the periosteum; the humeral condyles were sawn off with an oscillating saw and the bone pieces were pried apart with a periosteal detacher until the bone pieces completely detached to simulate a human supracondylar fracture. Fixing the fracture block, and drilling a hole perpendicular to the fracture surface by using an electric drill, wherein the depth is about 30mm; utilize the ke shi needle to confirm the nail position of saying after drilling, remain the ke shi needle motionless, adopt the utility model discloses a screw tap is that the screw enlarges the nail way, recycles the utility model discloses a screwdriver implants the screw, operates smoothly, does not take place smooth silk phenomenon, and hydrogen peroxide water washes, later washes totally with normal saline. After no obvious active bleeding is observed, the fascia and the skin are sutured layer by layer; the wound is bandaged after the incision is sutured, infection is prevented, and plaster fixation is performed when the elbow is bent.

Example 2:

the screw of this embodiment differs from embodiment 2 in that the starting point of the backward spiral is located on the thread extension line of the rear end of the forward thread, and the starting point of the backward thread is deviated by 90 ° in the clockwise direction from the starting point of the forward thread; the front thread and the back thread are equal-interval threads, the interval of the front thread is 1.8mm, and the interval of the back thread is 1.5mm.

The screw of above-mentioned embodiment is the utility model discloses a two kinds of concrete examples, the skilled person in the art can be according to the disclosure herein, based on the length of screw, the external diameter of screw, anterior segment external diameter and the relation of back end external diameter, through-hole internal diameter, each section account for the proportion of overall length, the thread pitch and the number of turns and the thread depth of the screw thread of the front track, the thread pitch and the number of turns and the design combination of screw thread of back track screw thread obtain the screw of different shapes and size to obtain the tap of corresponding shape.

Claims

1. The screw tap for the orthopedic screws is characterized by comprising a first handle part (1), a first connecting rod (2) and a screw tap head (3) which are sequentially arranged along the axial direction, wherein a first central hole (4) is formed in the first handle part, the first connecting rod and the screw tap head along the axial direction; the screw tap head is matched with the orthopedic screw in shape;

the orthopedic screw comprises a screw body, wherein the screw body comprises a front section, a middle section and a rear section along the axial direction, the surface of the front section is provided with a front thread, the surface of the middle section is of a smooth structure, and the surface of the rear section is provided with a rear thread; the outer diameter of the rear section is the same as or larger than that of the front section; the number of turns of the thread of the rear thread is smaller than that of the turns of the thread of the front thread;

the hollow hole is used for accommodating a screwdriver.

2. The screw tap for orthopedic screws of claim 1, wherein the thread section of the tap head matching the anterior thread is provided with a front chip groove and the thread section of the tap head matching the posterior thread is provided with a rear chip groove.

3. The screw tap for orthopedic screws as claimed in claim 1, wherein the rear section outer diameter is larger than the front section outer diameter, and the rear section outer diameter is larger than the middle section outer diameter, and the rear section and the middle section are in smooth transition or conical surface transition.

4. The tap for orthopedic screws of claim 1, wherein the screw length is 10mm to 100mm.

5. The tap for orthopedic screws of claims 1 or 3, wherein the screw has an outer diameter in the range of 1mm to 10mm, and the rear section has an outer diameter 0.1mm to 5mm larger than the front section.

6. A tap for orthopaedic screws according to claim 1 or 3, wherein the through hole has an inner diameter ranging from 0.1mm to 2mm.

7. The screw tap for orthopedic screws of claim 1, wherein the axial length of the middle section is 1-60% of the total length of the screw, the axial length of the front section is 10-90% of the total length of the screw, and the axial length of the rear section is 1-30% of the total length of the screw.

8. The screw tap for orthopedic screws of claim 1, wherein the lead thread has a thread turn in the range of 1 to 50 and a thread depth in the range of 0.1 to 3mm.

9. The tap for orthopedic screws of claim 1, wherein said posterior thread has a thread count ranging from 1 to 20 and a thread depth ranging from 0.1 to 4mm.

10. The screw tap for orthopedic screws of claim 1, wherein the posterior thread and the anterior thread are both clockwise rotated, and the starting point of the posterior thread is located on the extended thread of the anterior thread, while the starting point of the posterior thread is clockwise deviated from the starting point of the anterior thread by α degrees, 0< α ≦ 90 °.

11. The screw tap for orthopedic screws of claim 1, wherein the anterior thread and the posterior thread are equally spaced threads, and the thread pitch of the anterior thread is greater than the thread pitch of the posterior thread.

12. The screw tap for orthopedic screws of claim 1, wherein the pitch of the anterior thread ranges from 0.1 to 5mm, and the pitch of the anterior thread is 0.05 to 0.5mm larger than the pitch of the posterior thread.

13. The screw tap for orthopedic screws of claim 1, wherein the cross-sectional shape of said hollow bore is hexagonal quincunx, hexagonal or square.

14. The screw tap for orthopedic screws of claim 13, wherein the maximum inner diameter of said hollow bore decreases gradually in a direction from the posterior section to the anterior section.

15. The screwdriver for the orthopedic screw is characterized by comprising a second handle part (5), a second connecting rod (6) and a screwdriver head (7) which are arranged along the axial direction, wherein a second central hole (8) is formed in the second handle part (5), the second connecting rod (6) and the screwdriver head (7) along the axial direction, and the screwdriver head is matched with the hollow hole of the screw in the claim 13 or 14 in shape.