CN212037710U - Angle-adjustable sacral dual-purpose large deflection angle screw - Google Patents

Abstract

The utility model discloses a big declination screw of angle-adjustable's sacral dual-purpose belongs to the orthopedic medical utensil field of backbone, including screw base and screw body, screw body includes screw cap and the screw rod of being connected with screw cap, and spiral winding has the screw thread on the screw rod, is provided with U type groove on the screw base, and the bottom of screw base is provided with the through-hole, and screw body stretches out from the through-hole, and screw cap sets up in screw base, and screw cap's peripheral shape is complementary with the inner wall shape of through-hole, and screw base and the coaxial setting of screw body, and screw base side is provided with the connecting hole of being convenient for the fixed rod male, and the angle of swing between screw base and the screw rod is 0-70 between and 0-25 respectively. Because current screw install in two rear screw seats of sacrum and be connected the difficulty with the titanium stick, the utility model discloses the swing range of screw design can satisfy and put excellent demand, also difficult and the sacrum produces not hard up phenomenon between two simultaneously to make the holistic structural design of screw more reasonable.

Description

Angle-adjustable sacral dual-purpose large deflection angle screw

Technical Field

The utility model relates to a orthopedic medical utensil field of backbone especially relates to a big declination screw of sacral dual-purpose of angularly adjustable.

Background

Since the history of human beings, the word "fracture" has been accompanied with us. The skeleton of human body has the function of 'osteoclast-osteoblast', and the fracture has the tendency of self-healing. The natural healing process of fracture is approximately through the hematoncomesis period (2 weeks), callus formation period (1-2 months), and bone remodeling period (2 months-2 years). Nowadays, the "incisional internal fixation operation" by means of internal fixation materials is widely applied to the fields of trauma orthopedics (severe fracture such as comminuted fracture or open fracture), spine surgery (spondylolisthesis, lateral bending, tuberculosis, tumor, severe degenerative disease, etc.), joint surgery (joint replacement, etc.), cranio-maxillofacial surgery (false tooth implantation, etc.), veterinarian, etc., effectively maintains the stability of fracture, promotes the fracture healing process to pass through the "callus formation period" and enter the "bone remodeling period", and can obviously reduce the complications such as fracture nonunion, false tooth instability, etc. In addition, after the fracture passes through the callus formation period, the internal fixation material completes its function, and generally needs to be removed in the later period, so as to prevent the fracture from being blocked from further remodeling in the later period due to the stress shielding effect.

With the wide application of internal fixation materials in the medical field, in spinal surgery, several types of internal fixation materials (screws) commonly used at present are single-axis screws and multi-axis screws, which have respective advantages and disadvantages.

However, the existing medical screw has the problem that the medical screw cannot be installed and attached to the sacrum of the human vertebra due to the inconvenient angle adjustment, and particularly cannot be used on the sacrum II to realize fixation.

Disclosure of Invention

The invention aims to provide an angle-adjustable large deflection angle screw for sacrum, which solves the problem that the angle of a multi-shaft screw cannot be controlled in the background technology.

In order to achieve the purpose, the utility model adopts the technical proposal that: the utility model provides a big declination screw of sacral dual-purpose of angularly adjustable, includes screw base and screw body, the screw body include screw cap and with the screw rod that the screw cap is connected, the spiral winding has the screw thread on the screw rod, be provided with U type groove on the screw base, the bottom of screw base is provided with the through-hole, the screw body stretches out from the through-hole, the screw cap sets up in the screw base, the peripheral shape of screw cap is complementary with the inner wall shape of through-hole, and the screw base with the screw body coaxial setting, the side of screw base is provided with the connecting hole that is convenient for the fixed rod to insert, the swing contained angle between screw base and the screw rod is respectively between 0-70 and 0-25.

Preferably, the outer surfaces of the screw cap, the screw rod and the screw seat are all provided with anti-inflammatory coatings.

Preferably, the thread on the screw comprises a fine pitch thread and a coarse pitch thread, the fine pitch thread being adjacent the screw seat.

Preferably, the screw cap is circular, the through hole is provided with a circular inner wall, and the circular shape of the screw cap is matched with the circular inner wall of the through hole.

Preferably, a hexagonal groove or a cross groove or a straight groove or a plum groove or a cross groove is formed on the screw cap.

Preferably, the end of the screw rod facing away from the screw cap is provided with a tapping groove.

Preferably, the screw seat and the screw body are made of medical titanium.

Preferably, the screws are for the sacral region of the spine.

Compared with the prior art, the invention has the beneficial effects that: because current screw install in two rear screw seats of sacrum and be connected the difficulty with the titanium stick, the utility model discloses the swing range of screw design can satisfy and put excellent demand, also difficult and the sacrum produces not hard up phenomenon between two simultaneously to make the holistic structural design of screw more reasonable.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1. a screw seat; 2. a screw cap; 3. a screw; 4. small pitch threads; 5. a coarse pitch thread; 6. connecting holes; 7. a U-shaped groove.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Referring to fig. 1, the dual-purpose sacral fixation screw with an adjustable angle provided by the invention is used for correcting sacral regions of human vertebras and comprises a screw seat 1 and a screw body, wherein the screw body comprises a screw cap 2 and a screw rod 3 connected with the screw cap 2, threads are spirally wound on the screw rod 3, and the swing angles between the screw seat 1 and the screw rod 3 are respectively 0-70 degrees and 0-25 degrees. Because current screw install in two rear screw seats of sacrum and be connected the difficulty with the titanium stick, the utility model discloses the swing range of screw design can satisfy and put excellent demand, also difficult and the sacrum produces not hard up phenomenon between two simultaneously to make the holistic structural design of screw more reasonable.

More specifically, the threads on the screw shaft 3 include a fine pitch thread 4 and a coarse pitch thread 5, and the fine pitch thread 4 is adjacent to the screw housing 1. When the screw is used, the large-pitch thread 5 is screwed into cancellous bone with high bone density, and the small-pitch thread 4 is screwed into cortical bone with low bone density, so that osteoporosis is reduced, and the connection strength of the screw and the sacrum II is improved.

Be provided with U type groove 7 on the screw seat 1, the bottom of screw seat 1 is provided with the through-hole, and the screw body stretches out from the through-hole, and screw cap 2 sets up in screw seat 1, and the outer peripheral shape of screw cap 2 is complementary with the inner wall shape of through-hole mutually, and screw seat 1 sets up with the screw body is coaxial, and in this embodiment, screw cap 2 is circular, and the through-hole has circular inner wall, the circular and the circular inner wall phase-match of through-hole of screw cap 2. In the embodiment, the screw utilizes the complementary shape of the screw cap 2 and the screw seat 1, so that the screw seat 1 can only freely rotate around the axis of the screw body, the purpose of adjusting the orientation of the U-shaped groove 7 without influencing the locking performance of the screw is achieved, and the screw is conveniently adjusted when a rod is placed.

The side of the screw seat 1 is provided with a connecting hole for inserting a fixing rod conveniently, in the embodiment, the opposite side of the screw seat 1 is provided with a connecting hole, and after the screw is implanted into the sacral position conveniently, the connecting rod is used for introducing into the two connecting holes to fix the screw.

More specifically, a hexagonal groove, a cross groove, a straight groove, a quincuncial groove or a cross groove is formed on the screw cap 2. In the present embodiment, the nut 2 is formed with a hexagonal groove. The screw cap 2 can be designed in different groove shapes, depending on the technical differences in the field of application.

More specifically, screw rod 3 deviates from tapping groove is taken to the one end of screw cap 2, and the screw tapping forms the bone way after implanting, and the screw thread cutting gets into the bone way lateral wall and forms to grab and hold, avoids the screw to appear becoming flexible.

More specifically, the screw cap 2, the screw rod 3 and the screw base 1 are all made of medical titanium, and the outer surfaces of the screw cap 2, the screw rod 3 and the screw base 1 are all provided with anti-inflammatory coatings.

The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.

Claims (8)

1. An angle-adjustable sacral dual-purpose large deflection angle screw comprises a screw seat (1) and a screw body, the method is characterized in that: the screw body comprises a screw cap (2) and a screw rod (3) connected with the screw cap (2), the screw rod (3) is spirally wound with threads, the screw seat (1) is provided with a U-shaped groove (7), the bottom of the screw seat (1) is provided with a through hole, the screw body extends out of the through hole, the screw cap (2) is arranged in the screw seat (1), the outer circumference shape of the screw cap (2) is complementary with the inner wall shape of the through hole, the screw seat (1) and the screw body are coaxially arranged, the side surface of the screw seat (1) is provided with a connecting hole for inserting a fixing rod conveniently, the swing angles between the screw seat (1) and the screw rod (3) are respectively 0-70 degrees and 0-25 degrees.

2. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: the outer surfaces of the screw cap (2), the screw rod (3) and the screw seat (1) are all provided with anti-inflammatory coatings.

3. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: the screw thread on the screw rod (3) comprises a small-pitch screw thread (4) and a large-pitch screw thread (5), and the small-pitch screw thread (4) is close to the screw base (1).

4. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: the screw cap (2) is circular, the through hole is provided with a circular inner wall, and the circular shape of the screw cap (2) is matched with the circular inner wall of the through hole.

5. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: a hexagonal groove or a cross groove or a straight groove or a plum groove or a meter-shaped groove is formed in the screw cap (2).

6. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: one end of the screw rod (3) departing from the screw cap (2) is provided with a tapping groove.

7. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: the screw seat (1) and the screw body are made of medical titanium.

8. The angularly adjustable dual-purpose sacral high drift angle screw as defined in claim 1, wherein: the screw is used at the sacral two parts of the spine.

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