CN213075866U - Double-thread compression screw - Google Patents

Abstract

The utility model relates to a double thread forcing screw, including the nail body, the nail body includes head, middle part and afterbody, the surface of head is equipped with one-level external screw thread, middle part unthreaded and surface are smooth, the surface of afterbody is equipped with the second grade external screw thread, the afterbody cover is equipped with adjusting sleeve, adjusting sleeve's outer peripheral face is equipped with tertiary external screw thread, adjusting sleeve's inner peripheral surface be provided with second grade external screw thread matched with second grade internal thread, adjusting sleeve and afterbody threaded connection. The utility model provides a double thread forcing screw's overall length can be adjusted according to the length demand among the actual operation process, has improved double thread forcing screw's commonality and suitability.

Description

Double-thread compression screw

Technical Field

The application relates to the field of orthopedic medical instruments, in particular to a double-thread compression screw.

Background

At present, with the development of society and the improvement of living standard of human beings, the phenomenon of population aging in China is more and more obvious. Accordingly, the incidence of fracture of the elderly gradually increases, and surgical operation is an effective treatment for traumatic fracture of the elderly. The purpose of the operation is to reduce and fix the fracture and maintain the original stability. With the development of surgical techniques and theories, clinical surgical methods are also continuously improved, but the internal fixation of fractures by screws is still the simplest and effective treatment means.

In the orthopaedics internal fixation, for the joint fixation of small bone blocks, a double-thread compression screw is generally needed to be used for compressing and fixing the fracture end, so that the original joint state is recovered, and the healing of bones is facilitated. Before carrying out the operation, the doctor need select the suitable double thread forcing screw of length according to the X line piece, and screw length is short and can not play the fixed action, and the overlength then can be intruded soft tissue, arouses pain and damage, need prepare the double thread forcing screw of different specification and dimension simultaneously for clinical selection.

In view of the above-mentioned related technologies, the inventor thinks that the existing double-thread compression screw can be applied to different surgical requirements by adopting various specifications and sizes, and each kind of double-thread compression screw can only be applied to one surgical situation, and the universality is poor.

SUMMERY OF THE UTILITY MODEL

In order to improve the commonality of double thread forcing screw, this application provides a double thread forcing screw.

The application provides a double thread forcing screw adopts following technical scheme:

the utility model provides a double thread forcing screw, includes the nail body, the nail body includes head, middle part and afterbody, the surface of head is equipped with the one-level external screw thread, middle part unthreaded and surface are smooth, the surface of afterbody is equipped with the second grade external screw thread, the afterbody cover is equipped with adjusting sleeve, adjusting sleeve's outer peripheral face is equipped with tertiary external screw thread, adjusting sleeve's inner peripheral surface is provided with the second grade internal thread with second grade external screw thread matched with, adjusting sleeve and afterbody threaded connection.

Through adopting above-mentioned technical scheme, the doctor can rotate adjusting sleeve when installing this double thread forcing screw, because adjusting sleeve and afterbody threaded connection for adjusting sleeve can move along the axis direction of the nail body, thereby can adjust the distance between one-level external screw thread and the tertiary external screw thread, makes this double thread forcing screw's overall length can adjust according to the length demand among the actual operation process, has improved this double thread forcing screw's commonality.

Preferably, the turning direction of the third-level external thread is the same as that of the first-level external thread, and the thread pitch of the third-level external thread is larger than that of the first-level external thread.

Through adopting above-mentioned technical scheme, when the doctor twisted fracture department with this double thread forcing screw, because the pitch of head is little and both the spiral direction is the same than the pitch of afterbody, when the rotatory a week of the nail body, the screw in degree of depth of head is less than the screw in degree of depth of afterbody to produce the tension, to producing the effect of automatic pressurization between the fracture piece, make laminating each other between the fracture piece, be favorable to the fracture crack to close and the restoration of skeleton.

Preferably, the pitch of the secondary external thread is smaller than the pitch of the primary external thread.

Through adopting above-mentioned technical scheme, adjusting sleeve pipe rotation round, its distance of removing is shorter for adjusting sleeve pipe's regulation precision is higher, thereby helps realizing the more accurate regulation of this double thread forcing screw length.

Preferably, one end of the tail part close to the adjusting sleeve is provided with a first-stage inner hexagonal groove.

Through adopting above-mentioned technical scheme, make things convenient for the doctor to rotate to twist into or screw out the nail body, the difficult appearance of the in-process that rotates the nail body simultaneously skids, improves the convenience of operation.

Preferably, one end of the adjusting sleeve, which is far away from the tail, is provided with a second-stage inner hexagonal groove, and the diameter of an inscribed circle of the second-stage inner hexagonal groove is larger than that of the first-stage inner hexagonal groove.

Through adopting above-mentioned technical scheme, make things convenient for the doctor to rotate the regulation sleeve pipe and adjust, the in-process that rotates the regulation sleeve pipe simultaneously is difficult for appearing skidding, improves the convenience of operation.

Preferably, a through hole is formed in the central shaft of the nail body.

Through adopting above-mentioned technical scheme, make things convenient for beating into of operation in-process guide pin, for the minimally invasive operation of guide pin provides the space, have the guide effect to the implantation of two screw forcing screws, can reduce the operation incision, be favorable to the healing of wound.

Preferably, a plurality of edge grooves are formed in the threads of the primary external thread, and cutting edges are formed on the primary external thread by the edge grooves.

Through adopting above-mentioned technical scheme, need take out this double thread forcing screw after the operation recovery, at the in-process of taking out, the blade helps the broken bone tissue that blocks of one-level external screw thread, is convenient for take out of this double thread forcing screw.

Preferably, a self-tapping tip is fixedly arranged at one end of the head part, which is far away from the tail part.

By adopting the technical scheme, in the process of screwing the double-thread compression screw into the bone, the self-tapping tip can crush the blocked bone tissue, thereby being beneficial to the implantation of the double-thread compression screw.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the adjusting sleeve, the whole length of the double-thread compression screw can be adjusted, so that the double-thread compression screw is suitable for different requirements of internal fixation operations, and has good universality;

2. through set up the through-hole on the nail body, provide the space for the driving-in of guide pin, guide the implantation of two screw thread forcing screw, make its implantation position more accurate, the counterpoint is better.

Drawings

Fig. 1 is an exploded view of a double-threaded compression screw according to the present embodiment.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a sectional view of a double-threaded compression screw of the present embodiment in the axial direction thereof.

Description of reference numerals: 1. a nail body; 11. a through hole; 12. a self-tapping tip; 2. a head portion; 21. a primary external thread; 211. a blade groove; 3. a middle part; 4. a tail portion; 41. a secondary external thread; 42. a first-stage inner hexagonal groove; 5. adjusting the sleeve; 51. a third-level external thread; 52. secondary internal threads; 53. a second-stage inner hexagonal groove.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1 and 2, the embodiment of the present application discloses a double-thread compression screw, which includes a screw body 1 and an adjusting sleeve 5, wherein the screw body 1 includes a head portion 2, a middle portion 3 and a tail portion 4, and a first-stage external thread 21 is disposed on an outer surface of the head portion 2. The front end of the head part 2 is fixedly provided with a self-tapping point 12, a plurality of blade grooves 211 are arranged on the threads of the primary external thread 21, and two blade grooves 211 close to the front end of the nail body 1 are arranged on the blade grooves 211 in the embodiment and are larger. The blade groove 211 forms a cutting edge on the primary external thread 21. The outer surface of the middle portion 3 is smooth and unthreaded. The outer surface of the tail part 4 is provided with a second-level external thread 41, the tail part 4 is in threaded connection with the adjusting sleeve 5, and the end face, far away from the head part 2, of the tail part 4 is provided with a first-level inner hexagonal groove 42.

Referring to fig. 1 and 3, the one end and the adjusting sleeve 5 threaded connection of the nail body 1, through-hole 11 has been seted up on the center pin of the nail body 1, adjusting sleeve 5's surface is provided with tertiary external screw thread 51, adjusting sleeve 5's internal surface is provided with second grade internal thread 52, cooperate between this second grade internal thread 52 and the second grade external screw thread 41, the pitch of second grade external screw thread 41 is less than the pitch of one-level external screw thread 51, the pitch of tertiary external screw thread 51 is greater than the pitch of one-level external screw thread 21, in this embodiment, the pitch of second grade external screw thread 41 is 1/2 of. A second-stage inner hexagonal groove 53 is formed in one end face of the adjusting sleeve 5, and the diameter of the circumscribed circle of the second-stage inner hexagonal groove 53 is larger than that of the first-stage inner hexagonal groove 42. The central connecting line of the second-stage inner hexagonal groove 53 and the first-stage inner hexagonal groove 42 is collinear with the axis of the nail body 1.

The implementation principle of this application embodiment a double thread forcing screw does: in the clinical operation process, the corresponding body position is adopted according to the condition of a patient so as to facilitate the operation. Then reset the fracture end, it is temporarily fixed with holding the thigh pincers, punch to contralateral cortex bone or cancellous bone with the supporting drill bit electric drill of one-level external screw thread 21 earlier, reuse and the tapping of one-level external screw thread 21 screw thread assorted screw tap with fracture piece distal end, reuse and tertiary external screw thread 51 assorted screw tap with fracture piece near-end tapping, later measure the hole depth of drilling, because adjusting sleeve 5 and 4 threaded connection of afterbody, make this double thread forcing screw's overall length can carry out certain regulation according to the length demand among the actual operation process, adjust this double thread forcing screw's overall length according to the hole depth of drilling and make both match each other, the commonality of this double thread forcing screw has been improved. Then, a guide pin is driven into the drill hole, the through hole 11 of the adjusted double-thread compression screw passes through the guide pin, and the double-thread compression screw is integrally screwed into the bone by using a screw feeder, wherein the head 2 is positioned at the far end of the fracture block, and the adjusting sleeve 5 is positioned at the near end of the fracture block. This double thread forcing screw is at the in-process of twist, and self tapping point 12 is favorable to reducing the resistance that the nail body 1 received when passing through the bone tissue, and the pitch of one-level external screw thread 21 is less than the pitch of tertiary external screw thread 51 for the screw in speed of head 2 and afterbody 4 is different, thereby pressurizes cracked skeleton, makes the fracture face laminate more, helps the recovery of skeleton. Finally, the adjusting sleeve 5 is rotated by using the nail feeding device, the position of the adjusting sleeve 5 is further adjusted, so that the adjusting sleeve 5 is completely sunk into the bone, aseptic inflammatory reaction of skin and soft tissue caused by the protruding adjusting sleeve 5 is avoided at the fracture part with thinner soft tissue, and the joint movement is not easily influenced for the fracture at the position close to the joint. The double-thread compression screw needs to be taken out after the operation is healed, and in the taking-out process, the cutting edge is beneficial to the bone tissue blocked by the primary external thread 21 in a breaking way, so that the double-thread compression screw is convenient to take out.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a double thread forcing screw, includes the nail body (1), the nail body (1) is including head (2), middle part (3) and afterbody (4), the surface of head (2) is equipped with one-level external screw thread (21), middle part (3) are unthreaded and the surface is smooth, its characterized in that: the outer surface of the tail portion (4) is provided with a second-level external thread (41), the tail portion (4) is sleeved with an adjusting sleeve (5), the outer peripheral surface of the adjusting sleeve (5) is provided with a third-level external thread (51), the inner peripheral surface of the adjusting sleeve (5) is provided with a second-level internal thread (52) matched with the second-level external thread (41), and the adjusting sleeve (5) is in threaded connection with the tail portion (4).

2. A double-threaded compression screw as in claim 1, wherein: the screw direction of the three-level external thread (51) is the same as that of the one-level external thread (21), and the screw pitch of the three-level external thread (51) is larger than that of the one-level external thread (21).

3. A double-threaded compression screw as in claim 2, wherein: the thread pitch of the secondary external thread (41) is smaller than that of the primary external thread (21).

4. A double-threaded compression screw as in claim 1, wherein: one end of the tail part (4) close to the adjusting sleeve (5) is provided with a first-stage inner hexagonal groove (42).

5. A double-threaded compression screw as in claim 4 wherein: and one end of the adjusting sleeve (5) far away from the tail part (4) is provided with a second-stage inner hexagonal groove (53), and the diameter of an inscribed circle of the second-stage inner hexagonal groove (53) is larger than that of the first-stage inner hexagonal groove (42).

6. A double-threaded compression screw as in claim 1, wherein: the nail is characterized in that a through hole (11) is formed in the nail body (1), the through hole (11) extends along the central shaft of the nail body (1), and the through hole penetrates through the nail body (1).

7. A double-threaded compression screw as in claim 1, wherein: a plurality of edge grooves (211) are formed in the threads of the primary external thread (21), and cutting edges are formed on the primary external thread (21) by the edge grooves (211).

8. A double-threaded compression screw as in claim 1, wherein: and a self-tapping tip (12) is fixedly arranged at one end of the head (2) far away from the tail (4).

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