CN211962169U

CN211962169U - Hollow screw assembly structure and pressurizing tool

Info

Publication number: CN211962169U
Application number: CN201921837878.5U
Authority: CN
Inventors: 欧志坚; 王猛; 刘元刚
Original assignee: Double Medical Technology Inc
Current assignee: Double Medical Technology Inc
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-11-20
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses a hollow screw subassembly structure, this structure includes: hollow screw and sleeve, hollow screw with the coaxial matching of sleeve, hollow screw includes screw thread section, first smooth section and joint portion, the screw thread section with joint portion is located respectively first smooth section both ends, joint portion radially is non-circular cross-section, be equipped with in the sleeve cavity with joint portion assorted internal surface, the sleeve inner wall is equipped with the arch, joint portion is equipped with the recess of rectangular shape, protruding with recess looks sliding fit, the sleeve inner wall is equipped with first screw thread, joint portion cavity inner wall is equipped with sixth screw thread, first screw thread with sixth screw thread be used for with the fifth screw thread phase-match of last nail instrument. The utility model provides a hollow screw subassembly structure and pressurization instrument, simple structure can realize controllable pressurization through the pressurization instrument, and the screw slides and prevents the fracture end and shorten, and the amazing fracture healing that promotes of fine motion.

Description

Hollow screw assembly structure and pressurizing tool

Technical Field

The utility model relates to medical instrument technical field especially relates to a hollow screw subassembly structure and pressurization instrument.

Background

Fractures of four limbs such as thighbone, shin bone and the like are common fractures in clinic, in the treatment process, due to the traction influence of muscles at the fracture part, the affected part is shortened and deformed, the reduction, the recovery and the maintenance of the length of the fractured part are difficult in the operation process, complications such as deformed healing and poor lower limb force line are possible to occur, traumatic arthritis and the like are finally caused, and the body health of a patient is seriously affected.

When the four-limb bone fracture is treated, the existing hollow nail is singly fixed or is matched with a bone fracture plate for combined fixation, the fixation method is used for pressurizing and fixing the fractured end of the bone through the structural design principle of the hollow nail, and aiming at the position with the bone defect, the pressurization easily causes the deformation of the original physiological anatomical form of the fractured end, the shortening of limbs and the complications of deformed healing, prolonged healing and even non-healing of the fractured end and the like. Accordingly, it is desirable to provide a slidable cannulated screw assembly configuration and a controllable compression tool.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, an object of the utility model is to provide a hollow screw subassembly structure and pressurization instrument has simple structure's characteristics, has three kinds of screw forms to be applicable to the fracture at different positions and type, can realize controllable pressurization through the pressurization instrument, and the screw slides in the bone and prevents the fracture end shortening, and the micro-motion stimulation promotes union of fracture.

The utility model discloses a following technical scheme realizes:

a cannulated screw assembly structure, the structure comprising: hollow screw and sleeve, hollow screw with the coaxial matching of sleeve, the sleeve with all be equipped with the cavity in the hollow screw, hollow screw includes screw thread section, first smooth section and joint portion, the screw thread section with joint portion is located respectively the both ends of first smooth section, the radial cross-section of joint portion is non-circular cross-section, be equipped with in the sleeve cavity with joint portion assorted internal surface, the sleeve inner wall is equipped with the arch, joint portion is equipped with the recess of rectangular shape, protruding with recess looks sliding fit, the sleeve inner wall is equipped with first screw thread, joint portion cavity inner wall is equipped with sixth screw thread, first screw thread with sixth screw thread be used for with the fifth screw thread phase-match of last nail instrument.

Optionally, the protrusion is a riveted hole.

Optionally, the groove is parallel to the axis of the clamping portion.

Optionally, a distance between a highest point of the protrusion and a recessed plane of the groove is smaller than a recessed depth of the groove, and a width of the groove is larger than a maximum diameter of the protrusion.

Optionally, the outer surface of the sleeve is provided with a second thread, and the length of the second thread is less than or equal to the length of the sleeve.

Optionally, the sleeve includes a second smooth section and an expanding section, the expanding section is disposed at the proximal end of the sleeve, and the maximum diameter of the expanding section is larger than the diameter of the second smooth section.

Optionally, the distal end of the cannulated screw is provided with a cutting element.

According to the embodiment of the present invention, a pressurizing tool is provided, which comprises a pressurizing sleeve, a first screw member, a second screw member and the hollow screw assembly structure, wherein the pressurizing sleeve is coaxially matched with the first screw member, the second screw member is fixedly connected to the distal end of the first screw member, the pressurizing sleeve, the first screw member and the second screw member are all provided with a cavity therein, the distal end of the pressurizing sleeve is provided with a screw head avoiding hole, the inner wall of the cavity inside the pressurizing sleeve is provided with a third thread, the outer surface of the first screw member is provided with a fourth thread, the third thread is matched with the fourth thread, the distal end of the first screw member is provided with a rod member with a non-circular cross section, the expansion section is provided with a non-circular cross section cavity, the cavity in the expansion section is provided with an inner surface matched with the outer surface of the rod member, and a fifth thread is arranged on the outer surface of the second screw rod piece and is matched with the first thread.

Optionally, a minimum diameter of the screw nail head avoiding hole is larger than a maximum diameter of the expansion section, a diameter of the second screw member is smaller than a minimum diameter of the cavity in the expansion section, and a diameter of the second screw member is smaller than a diameter of the first screw member.

Optionally, the pressurizing tool further comprises a first hand-held piece and a second hand-held piece, the first hand-held piece is fixedly connected with the first screw rod piece, the first hand-held piece is used for tightly holding the first screw rod piece, the second hand-held piece is fixedly connected with the proximal end of the pressurizing sleeve, and the second hand-held piece is used for rotationally pressurizing the pressurizing sleeve.

The utility model provides a pair of hollow screw subassembly structure and pressurization instrument has following beneficial effect:

1) the utility model provides a hollow screw subassembly structure, simple structure, slidable between hollow screw and sleeve, prevention fracture end shortens, and the amazing bone healing that promotes of fine motion.

2) When the screw is implanted, the hollow screw and the sleeve are relatively fixed and kept in an initial state by a pressurizing tool, and controllable pressurization is realized.

3) An anti-rotation mechanism is arranged between the sleeve and the hollow screw, so that the screw rod is effectively prevented from rotating in the sleeve, and the anti-rotation structure is positioned in the screw structure and is not in contact with the bone.

4) There are three forms of screws that are suitable for use in different locations and types of fractures.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of the hollow screw assembly of the present invention.

Fig. 2 is a schematic view of the assembly of the pressing tool and the hollow screw assembly according to the present invention.

Fig. 3 is a cross-sectional view of the pressing tool of the present invention.

Fig. 4 is a perspective view of a second embodiment of the hollow screw assembly according to the present invention.

Fig. 5 is a perspective view of a third construction of the hollow screw assembly according to the invention.

Wherein the reference numerals in the figures correspond to:

1-sleeve, 2-thread section, 3-first smooth section, 4-bulge, 5-groove, 6-first thread, 7-clamping part, 8-second thread, 9-cutting part, 10-pressurizing sleeve, 11-first screw member, 12-second screw member, 13-screw nail head avoiding hole, 14-third thread, 15-fourth thread, 16-fifth thread, 17-first handheld member, 18-second handheld member and 19-sixth thread.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Example 1:

referring to the attached drawings of the specification, figures 2 and 3, a hollow screw component structure comprises a hollow screw and a sleeve 1, the hollow screw and the sleeve 1 are coaxially matched, cavities are arranged in the sleeve 1 and the hollow screw, the hollow screw comprises a screw thread section 2, a first smooth section 3 and a clamping part 7, the screw thread section 2 and the clamping part 7 are respectively arranged at two ends of the first smooth section 3, the radial section of the clamping part 7 is a non-circular section, an inner surface matched with the clamping part 7 is arranged in the cavity of the sleeve 1, the clamping part 7 is matched with the sleeve 1, so that an anti-rotation mechanism is arranged between the hollow screw component structure and the clamping part when a pressurizing tool is used for rotating and pressurizing the hollow screw component structure, relative rotation cannot be generated, the anti-rotation mechanism is arranged in the sleeve to avoid contacting with bones, a bulge 4 is arranged on the inner wall of the sleeve, a strip-shaped groove 5 is arranged on the clamping part 7, the bulge, the inner wall of the cavity of the clamping portion 7 is provided with a sixth thread 19, the first thread 6 and the sixth thread 19 are matched with a fifth thread 16 of a nailing tool, so that the pressurizing tool is screwed into the hollow screw assembly structure and then the sleeve 1 and the hollow screw are relatively fixed, the sleeve 1 and the hollow screw cannot slide relatively when the hollow screw is implanted, and controllable pressurization of the hollow screw assembly structure is facilitated.

Further, the protrusion 4 is a rivet punch. The groove 5 is parallel to the axis of the snap-in part 7. The distance between the highest point of the protrusion 4 and the concave plane of the groove 5 is less than the concave depth of the groove 5, the width of the groove 5 is greater than the maximum diameter of the protrusion 4, so that the protrusion 4 slides in the groove 5 and the sleeve 1 and the hollow screw are prevented from falling off. The position of the second thread 8 arranged on the outer surface of the sleeve 1 is arranged on the outer surface of the expansion section 21 of the sleeve 1, the length of the second thread 8 is equal to that of the expansion section 21, and the second thread is matched with the thread section 2 of the hollow screw to draw two ends of fracture close. The sleeve 1 comprises a second smooth section 20 and an expanded section 21, the expanded section 21 is arranged at the proximal end of the sleeve 1, and the maximum diameter of the expanded section 21 is larger than that of the second smooth section 20. The distal end of the cannulated screw is provided with a cutting member 9 for cutting bone.

A pressurizing tool comprises a pressurizing sleeve 10, a first screw rod 11, the second screw rod piece 12 and the hollow screw assembly structure, the pressurizing sleeve 10 is coaxially matched with the first screw rod piece 11, the second screw rod piece 12 is fixedly connected to the far end of the first screw rod piece 11, cavities are formed inside the pressurizing sleeve 10, the first screw rod piece 11 and the second screw rod piece 12, a screw nail head avoiding hole 13 is formed in the far end of the pressurizing sleeve 10, third threads 14 are formed in the inner wall of the cavity inside the pressurizing sleeve 10, fourth threads 15 are formed in the outer surface of the first screw rod piece 11, the third threads 14 are matched with the fourth threads 15, a rod piece with a non-circular cross section in the cross section is arranged at the far end of the first screw rod piece 11, a non-circular cross section cavity is formed in the expansion section 21, an inner surface matched with the outer surface of the rod piece is formed in the cavity inside the expansion section 21, fifth threads 16 are formed in the outer surface of the second screw rod piece 12.

Further, the minimum diameter of the screw nail head avoiding hole 13 is larger than the maximum diameter of the expansion section 21, the expansion section 21 of the sleeve 1 can be screwed into the screw nail head avoiding hole 13 when the hollow screw assembly structure is pressurized, the diameter of the second screw member 12 is smaller than the minimum diameter of the cavity in the expansion section 21, and the diameter of the second screw member 12 is smaller than the diameter of the first screw member 11. The pressurizing tool further comprises a first handheld piece 17 and a second handheld piece 18, the first handheld piece 17 is fixedly connected with the first screw rod part 11, the first handheld piece 17 is used for tightly holding the first screw rod part 11, the second handheld piece 18 is fixedly connected with the proximal end of the pressurizing sleeve 10, the second handheld piece 18 is used for rotatably pressurizing the pressurizing sleeve 10, and the pressurizing tool is structurally matched with the hollow screw assembly and used for realizing controllable pressurization in the process of implanting the hollow screw assembly into bone. The cannulated screw assembly in this embodiment is of a first construction.

Example 2:

the present embodiment is different from embodiment 1 mainly in the length and position of the second thread 8 provided on the outer surface of the sleeve 1. Referring to fig. 4, in the present embodiment, the sleeve 1 is provided with a second thread 8 on the outer surface, and the length of the second thread 8 is equal to the length of the sleeve 1.

Example 3:

this embodiment is different from embodiments 1 and 2 in the length and position of the second thread 8 provided on the outer surface of the sleeve 1. Referring to fig. 5, in the present embodiment, the outer surface of the sleeve 1 is provided with the second thread 8 at the position on the outer surface of the second smooth section 20 of the sleeve 1, and the length of the second thread 8 is equal to the length of the second smooth section 20.

In the above embodiments, the screw form may be various.

The hollow screw component structure provided by the utility model has simple structure, the hollow screw and the sleeve can slide, the shortening of the fracture end is prevented, and the micro-motion stimulation promotes the bone healing; when the screw is implanted, the hollow screw and the sleeve are relatively fixed and keep an initial state through a pressurizing tool, and controllable pressurization is realized; an anti-rotation mechanism is arranged between the sleeve and the hollow screw, so that the screw rod is effectively prevented from rotating in the sleeve, and the anti-rotation structure is positioned in the screw structure and is prevented from contacting with bones; there are three forms of screws that are suitable for use in different locations and types of fractures.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a hollow screw subassembly structure, its characterized in that, hollow screw subassembly structure includes hollow screw and sleeve (1), hollow screw with the coaxial matching of sleeve (1), sleeve (1) with all be equipped with the cavity in the hollow screw, hollow screw includes screw thread section (2), first smooth section (3) and joint portion (7), screw thread section (2) with joint portion (7) are located respectively the both ends of first smooth section (3), the radial cross-section of joint portion (7) is non-circular cross-section, be equipped with in the cavity of sleeve (1) with joint portion (7) assorted internal surface, the sleeve inner wall is equipped with arch (4), joint portion (7) are equipped with recess (5) of rectangular shape, arch (4) with recess (5) looks sliding fit, the sleeve inner wall is equipped with first screw thread (6), the inner wall of the cavity of the clamping portion (7) is provided with a sixth thread (19), and the first thread (6) and the sixth thread (19) are matched with a fifth thread (16) of an upper nailing tool.

2. A hollow screw assembly according to claim 1, wherein the projection (4) is a riveted hole punch.

3. A hollow screw assembly according to claim 1, wherein the recess (5) is parallel to the axis of the clamping portion (7).

4. A hollow screw assembly according to claim 1, characterized in that the distance of the highest point of the projection (4) from the recess plane of the recess (5) is smaller than the recess depth of the recess (5), and the width of the recess (5) is larger than the largest diameter of the projection (4).

5. A cannulated screw assembly according to claim 1, wherein the external surface of the sleeve (1) is provided with a second thread (8), the length of the second thread (8) being less than or equal to the length of the sleeve (1).

6. A hollow screw assembly according to claim 5, wherein the sleeve (1) comprises a second smooth section (20) and an expansion section (21), the expansion section (21) being provided at the proximal end of the sleeve (1), the maximum diameter of the expansion section (21) being larger than the diameter of the second smooth section (20).

7. A cannulated screw assembly according to claim 1, wherein a distal end of the cannulated screw is provided with a cutting element (9).

8. A pressurizing tool, comprising a pressurizing sleeve (10), a first screw member (11), a second screw member (12) and the hollow screw assembly structure of any one of claims 1 to 7, wherein the pressurizing sleeve (10) is coaxially matched with the first screw member (11), the second screw member (12) is fixedly connected with the far end of the first screw member (11), cavities are arranged inside the pressurizing sleeve (10), the first screw member (11) and the second screw member (12), a screw head avoiding hole (13) is arranged at the far end of the pressurizing sleeve (10), a third thread (14) is arranged on the inner wall of the cavity inside the pressurizing sleeve (10), a fourth thread (15) is arranged on the outer surface of the first screw member (11), the third thread (14) is matched with the fourth thread (15), a rod member with a non-circular cross section is arranged at the far end of the first screw member (11), the sleeve (1) comprises an expansion section (21), the expansion section (21) is provided with a cavity with a non-circular cross section, the cavity in the expansion section (21) is provided with an inner surface matched with the outer surface of the rod piece, the outer surface of the second rod piece (12) is provided with a fifth thread (16), and the fifth thread (16) is matched with the first thread (6).

9. A pressing tool according to claim 8, wherein the minimum diameter of the screw head avoiding hole (13) is larger than the maximum diameter of the expansion section (21), the diameter of the second screw member (12) is smaller than the minimum diameter of the cavity in the expansion section (21), and the diameter of the second screw member (12) is smaller than the diameter of the first screw member (11).

10. A pressing tool according to claim 8, further comprising a first hand piece (17) and a second hand piece (18), said first hand piece (17) being fixedly connected to said first screw member (11), said first hand piece (17) being adapted to grip said first screw member (11), said second hand piece (18) being fixedly connected to a proximal end of said pressing sleeve (10), said second hand piece (18) being adapted to rotatably press said pressing sleeve (10).