CN213665657U

CN213665657U - Novel bone cement fixing screw

Info

Publication number: CN213665657U
Application number: CN202021738999.7U
Authority: CN
Inventors: 王真
Original assignee: People's Hospital Of Ningxia Hui Autonomous Region (ningxia Ophthalmological Hospital)
Current assignee: People's Hospital Of Ningxia Hui Autonomous Region (ningxia Ophthalmological Hospital)
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-07-13
Anticipated expiration: 2030-08-19

Abstract

The utility model discloses a novel bone cement fixing screw, which comprises a tail end screw cap, a screw rod, a screw head part and an injection head which are connected in sequence from left to right, wherein the screw rod, the screw head part and the injection head are all of hollow structures, a bone cement injection flow passage is formed in a hollow inner cavity, a bone cement injection side hole is arranged on the screw head part, the injection head is of a round platform-shaped structure, a bone cement injection vertical hole is arranged at the lower bottom end of the injection head, and an internal thread is arranged on the inner injection flow passage of the tail end screw cap; when in use, the bone cement fixing screw is connected with the bone cement injector through the internal screw, and the bone cement is injected through the bone cement injection vertical hole and the bone cement injection side hole; simultaneously, when the upper thread and the lower thread are screwed in, the groove is utilized to scrape and transmit the bone fragments drilled into fragments, the compression of the bone fragments on peripheral nerves and blood vessels is reduced, the drilling process is easier, the bone cement injection effect is ensured, and the bone cement injection device has the characteristics of reasonable design, convenience in use and good treatment effect.

Description

Novel bone cement fixing screw

Technical Field

The utility model belongs to the technical field of the supplementary apparatus of bone surgery, concretely relates to novel bone cement set screw.

Background

Since the 21 st century, more and more countries have shown the phenomenon of increasing the proportion of aging population, sociology refers to the aging population, with the progress of aging population, the annual incidence rate of vertebral body compression fracture is about 30%, vertebral body compression fracture is the most common complication of spinal osteoporosis, is common to the elderly and is often found in T11-L2, and can cause pain at the fracture part, high loss of vertebral body, unstable spine and even kyphosis; with the development of the disease, the symptoms of the disease are mainly manifested by continuous pain of the fractured vertebral body part and limited spinal motion, and finally the quality of life of the patient is seriously damaged, even the patient dies;

at present, the treatment method of the vertebral compression fracture mainly comprises two aspects of conservative treatment and operation treatment, wherein the conservative treatment mainly comprises the application of an analgesic drug, an anti-osteoporosis drug, bed rest, brace fixation, rehabilitation treatment and the like; the operation therapy mainly applies percutaneous vertebral body strengthening operation (PVA), including Percutaneous Vertebroplasty (PVP) and Percutaneous Kyphoplasty (PKP), the PVP and PKP for treating the osteoporotic vertebral body compression fracture can realize rapid pain relieving, vertebral body height recovery, fracture vertebral body strength and rigidity strengthening and kyphotic deformity correction;

however, the bone cement displacement condition after the bone cement is filled for the existing vertebral compression fracture frequently appears in clinic, so that the operation treatment fails, patients have to receive an open type revision operation, and patients with the existing vertebral compression fracture mostly are old patients, and patients with the secondary revision operation are difficult to bear, even cause serious consequences such as death of the patients.

Disclosure of Invention

Defect to above-mentioned prior art existence, the utility model aims to provide a novel bone cement set screw, including the tail end nut, the screw rod, screw head and injection head, be connected bone cement set screw and bone cement syringe through set up the internal screw in the tail end nut, through setting up at the screw rod, fixed external screw on screw head and the injection head is with bone cement set screw fixation in patient's vertebra to erect hole and bone cement injection side opening through the bone cement injection and carry out the injection of bone cement, treat centrum compressibility fracture patient, have reasonable in design, high durability and convenient use, characteristics that treatment effect is good.

In order to achieve the above object, the utility model adopts the following technical scheme:

a novel bone cement fixing screw comprises a tail end screw cap, a screw rod, a screw head and an injection head which are sequentially connected from left to right, wherein the tail end screw cap, the screw rod, the screw head and the injection head are all of hollow structures, a flow channel for injecting bone cement is formed in each hollow structure, a bone cement injection side hole communicated with the injection flow channel is formed in the front end of the screw head, the injection head is of a circular table-shaped structure with the diameter sequentially reduced from left to right, and a bone cement injection vertical hole communicated with the injection flow channel is formed in the lower bottom end of the injection head; an inner thread used for being connected with a bone cement injector is arranged on an inner injection runner of the tail end screw cap; a circle of edge grooves are equidistantly arranged on the outer side of the injection head.

Preferably, the outer side of the tail end nut is also provided with a tail end thread; the outer side of the screw rod is provided with an external thread used for being fixed with vertebral tissues, the external thread sequentially comprises a first thread section, a second thread section and a third thread section from left to right, the thread sections of the first thread section, the second thread section and the third thread section are the same in length, and the thread pitch of each thread section is sequentially reduced from the first thread section, the second thread section to the third thread section.

Preferably, the outer side of the screw head is provided with a fastening external thread, the thread pitches of the fastening external thread are equal, and the external diameter of the thread decreases from top to bottom.

Preferably, the tail end thread, the first thread section, the second thread section, the third thread section and the fastening external thread all use double threads, each double thread comprises an upper thread line and a lower thread line, a groove is formed between each upper thread line and each lower thread line, the outer diameter of each upper thread line is smaller than that of each lower thread line, and each groove is used for scraping and transferring bone fragments in the direction of the side wall of the screw rod and the side wall of the screw head.

Preferably, the outer side of the injection head is also provided with a head external thread, the thread pitches of the head external thread are equal, the external diameters of the threads are sequentially reduced from left to right, the included angle between the edge groove and the thread direction of the head external thread is 30-45 degrees, and the edge groove is matched with the groove for use.

Preferably, the inner included angle of the blade groove is 30-55 degrees, and the depth of the blade groove is 0.4-0.8 mm.

Preferably, at least 3-4 side holes for injecting bone cement are arranged, and the side holes for injecting bone cement are arranged in a staggered manner.

Preferably, the length of the novel bone cement fixing screw is 7-10cm, the outer diameters of the upper thread lines of the first thread section, the second thread section and the third thread section are 7.2mm, the outer diameter of the lower thread line is 7.5mm, the outer diameters of the outer threads from left to right are 7.2mm-7.0mm in sequence, and the outer diameters of the lower thread line are 7.5mm-7.3mm in sequence.

The utility model has the advantages that: the utility model discloses a novel bone cement set screw compares with prior art, the utility model discloses an improve part and lie in:

(1) the utility model designs a novel bone cement fixing screw, and the inner side of the tail end screw cap is provided with an internal thread which is connected with a bone cement injector, and the bone cement is injected into a bone cement injection flow passage, and the bone cement is injected through a bone cement injection vertical hole and a bone cement injection side hole, so that the bone cement fixing screw treats patients with vertebral compression fracture and has the characteristics of reasonable design, convenient use and good treatment effect;

(2) the utility model discloses be provided with the external screw thread that is used for fixing on screw rod and screwhead, and, the pitch of the external screw thread on the screw rod reduces from left to right gradually, strengthens the power of screwing of screw rod and vertebra, the external diameter of the screw thread of the fastening external screw thread on screwhead reduces from left to right in proper order, can further strengthen the power of screwing of bone cement set screw and vertebra for bone cement set screw is more firm, designs into the external diameter of the screw thread of the fastening external screw thread on screwhead and reduces the self tapping power that can strengthen screwhead in proper order from left to right simultaneously, makes its process of boring into the vertebra easier;

(3) the external screw thread that sets up on screw rod and the screwhead is the double thread, during the use, uses with the recess cooperation, when the utilization was gone up the helix and is screwed in with lower helix, can scrape and transmit the bone fragment of screw rod and screwhead lateral wall direction, reduces the oppression of fragment piece to peripheral nerve and blood vessel, reduces patient's discomfort, can effectually transport away bone fragment simultaneously for it is easier to bore the process, guarantees bone cement injection effect.

Drawings

Fig. 1 is a front view of a bone cement fixing screw according to the present invention.

Fig. 2 is a side view of a bone cement set screw according to the present invention.

Fig. 3 is a cross-sectional view of a bone cement fixation screw according to the present invention.

Fig. 4 is a partial enlarged view of the screw head of the present invention.

Fig. 5 is a partial enlarged view of the injection head of the present invention.

Wherein: 1. the screw comprises a tail end screw cap, 11 internal threads, 12 tail end threads, 2 screw rods, 21 flow channels, 22 first thread sections, 23 second thread sections, 24 third thread sections, 3 screw heads, 31 fastening external threads, 32 injection side holes, 4 injection heads, 41 head external threads, 42 injection vertical holes, 43 blade grooves, 5 upper thread lines, 6 lower thread lines, 7 grooves and an included angle between the blade grooves and the thread direction of the head external threads.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the technical solution of the present invention with reference to the accompanying drawings and embodiments.

Referring to fig. 1-5, the novel bone cement fixing screw comprises a tail end nut 1, a screw rod 2, a screw head 3 and an injection head 4 which are connected in sequence from left to right, wherein the tail end nut 1, the screw rod 2, the screw head 3 and the injection head 4 are all of hollow structures, a bone cement injection runner 21 is formed in a hollow inner cavity, a bone cement injection side hole 32 communicated with the bone cement injection runner 21 is formed in the front end of the screw head 3, the diameter of the injection head 4 is of a truncated cone-shaped structure which is gradually reduced from left to right, a bone cement injection vertical hole 42 communicated with the injection runner 21 is formed in the lower bottom end of the injection head 4, and the bone cement injection vertical hole 42 and the bone cement injection side hole 32 are matched for use during bone cement injection; the inner injection runner of the tail end screw cap 1 is provided with an internal thread 11 for connecting with a bone cement injector, and the outer side of the injection head 4 is provided with a circle of blade grooves 43 at equal intervals; the outer side of the tail end screw cap 1 is further provided with a tail end thread 12, the outer side of the screw rod 2 is provided with an external thread for fixing with a vertebral column tissue, the vertebral column tissue and a bone cement fixing screw are fixed through the external thread, the external thread sequentially comprises a first thread section 22, a second thread section 23 and a third thread section 24 from left to right, the thread sections of the first thread section 22, the second thread section 23 and the third thread section 24 are the same in length, the thread pitch of each thread section is sequentially reduced from the first thread section 22, the second thread section 23 to the third thread section 24, the screwing force of the cement fixing screw and the vertebral column is enhanced, and the bone cement fixing screw is more stable; meanwhile, the outer side of the screw head 3 is provided with a fastening external thread 31, the thread pitches of the fastening external thread 31 are equal, and the external diameter of the thread is reduced from top to bottom, so that the self-tapping force of the screw head is further enhanced, the process of drilling the screw head into the spine is easier, and the position of a drilled bone cement fixing screw is further fixed;

preferably, the thread pitch of the first thread section 22 is 1.3mm-2mm, the thread pitch of the second thread section 23 is 0.8mm-1.5mm, the thread pitch of the third thread section 24 is 0.5mm-1.2mm, and the thread pitch of the fastening external thread 31 is the same as that of the third thread section 24;

preferably, the tail end thread 12, the first thread section 22, the second thread section 23, the third thread section 24 and the fastening external thread 31 all use double threads, the double threads comprise an upper thread 5 and a lower thread 6, a groove 7 is formed between the upper thread 5 and the lower thread 6, the outer diameter of the upper thread 5 is smaller than that of the lower thread 6, when the bone cement fixing screw drills, the groove 7 is used for transmitting broken bones drilled in the drilling process of the upper thread 5 and the lower thread 6 and simultaneously scraping and transmitting bone fragments in the side wall direction of the screw rod 2 and the screw head 3, so that the compression of the broken bones on nerves and blood vessels around the bone cement fixing screw is reduced, the discomfort of a patient is reduced, meanwhile, the bone fragments can be effectively transported out, the drilling process is easier, and the bone cement injection effect is ensured; meanwhile, the outer side of the injection head 4 is provided with a head external thread 41 and a blade groove 43, the thread pitches of the head external thread 41 are equal, and the external diameters of the threads are sequentially reduced from left to right to form a self-tapping screw head, so that the drilling of a bone cement fixing screw is facilitated;

preferably, in order to enhance the cleaning and transporting functions of the blade groove 43, the inclined angle of the blade groove 43 and the upper groove 7 is adapted, the included angle a between the blade groove 43 and the thread direction of the head external thread 41 is designed to be 30-45 degrees, the internal included angle of the blade groove 43 is designed to be 30-55 degrees, and the depth of the blade groove is designed to be 0.4-0.8 mm; and the blade groove 43 is matched with the groove 7 for transmitting the broken bone in the drilling process.

Preferably, in order to enhance the injection speed and the injection requirement of the bone cement, the number of the bone cement injection side holes 32 is designed according to the requirement, at least 3-4 bone cement injection side holes 32 are arranged, and the bone cement injection side holes are arranged in a staggered mode.

Preferably, the length of the novel bone cement fixing screw is 7-10cm, the outer diameters of the upper thread lines 5 of the first thread section 22, the second thread section 23 and the third thread section 24 are all 7.2mm, the outer diameter of the lower thread line 6 is 7.5mm, the outer diameters of the threads of the external threads 31 are 7.2mm-7.0mm from left to right, and the outer diameters of the lower thread lines 6 are 7.5mm-7.3mm from left to right.

The utility model discloses a use and theory of use:

(1) after patients suffering from spinal osteoporosis are anesthetized (general anesthesia or local anesthesia is selected according to actual needs), the patients take the prone position, soft pads are arranged at the chest and the anterior superior iliac spine of the patients, and the abdomen is suspended in the air, so that the chest and the waist sections are kept at the hyperextension position to facilitate the position resetting; after the body position is reset, marking body surface projections of the outer side edges of vertebral pedicles at two sides of a diseased vertebra under C-shaped arm perspective; transversely cutting skin at a position 0.5-1cm outside the body surface marker according to the fat and thin degree of a patient, wherein the length is about 7mm, and cutting subcutaneous tissues and lumbar and dorsal fascia layer by layer;

(2) firstly, connecting the bone cement fixing screw with a bone cement injector, and leading the connected bone cement fixing screw to penetrate into a vertebral body through a vertebral pedicle along the incision wound direction under the front-back x-ray perspective guidance, and rotating the bone cement fixing screw to rotate during the penetration so that an injection head 4 (a self-tapping screw head) gradually screws into the vertebral body (at the moment, the penetration position needs to be noticed, and the screw is prevented from being mistakenly inserted into the vertebral canal as much as possible); while suspending, the broken bone fragments are conveyed upwards along the blade grooves 43 and the grooves 7, and the blade grooves 43 and the grooves 7 scrape off and convey the bone fragments in the side wall direction of the screw rod 2 and the screw head part 3 upwards, so that the compression of the bone fragments on the peripheral nerves and blood vessels of the bone cement fixing screw is reduced, and the pain of a patient is relieved;

(3) when the bone cement fixing screw is screwed into a position in the vertebral body where bone cement injection is needed, the bone cement injector is pushed, the bone cement flows into the flow passage 21, and the patient vertebral body is injected through the injection side hole 32 and the injection vertical hole 42, namely the injection of the bone cement is completed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The novel bone cement fixing screw is characterized by comprising a tail end screw cap (1), a screw rod (2), a screw head (3) and an injection head (4) which are sequentially connected from left to right, wherein the tail end screw cap (1), the screw rod (2), the screw head (3) and the injection head (4) are all of hollow structures, a bone cement injection runner (21) is formed in each hollow structure, a bone cement injection side hole (32) communicated with the injection runner (21) is formed in the front end of the screw head (3), the injection head (4) is of a circular truncated cone-shaped structure with a wide upper part and a narrow lower part, and a bone cement injection vertical hole (42) communicated with the injection runner (21) is formed in the lower bottom end of the injection head (4); an inner thread (11) used for being connected with a bone cement injector is arranged on an inner injection runner of the tail end screw cap (1); a circle of edge grooves (43) are equidistantly arranged on the outer side of the injection head (4).

2. The new bone cement fixation screw as claimed in claim 1, characterized in that the outside of said tail end nut (1) is further provided with a tail end thread (12); the outside of screw rod (2) is provided with and is used for the external screw thread fixed with vertebra tissue, the external screw thread is by left to right including first screw thread section (22), second screw thread section (23) and third screw thread section (24) in proper order, the screw thread section length of first screw thread section (22), second screw thread section (23) and third screw thread section (24) is the same, and the screw pitch of each screw thread section reduces in proper order from first screw thread section (22), second screw thread section (23) to third screw thread section (24).

3. The new bone cement fixing screw as claimed in claim 2, characterized in that the outer side of the screw head (3) is provided with a fastening external thread (31), the pitch of the fastening external thread (31) is equal, and the external diameter of the thread decreases from top to bottom.

4. The new bone cement set screw as claimed in claim 3, characterized in that the tail end thread (12), the first thread section (22), the second thread section (23), the third thread section (24) and the fastening external thread (31) all use double threads, the double threads include an upper thread (5) and a lower thread (6), a groove (7) is formed between the upper thread (5) and the lower thread (6), the outer diameter of the upper thread (5) is smaller than that of the lower thread (6), and the groove (7) is used for scraping and transferring bone fragments in the direction of the side wall of the screw (2) and the screw head (3).

5. The novel bone cement fixing screw as claimed in claim 4, wherein the outside of the injection head (4) is further provided with a head external thread (41), the thread pitch of the head external thread (41) is equal, the external diameter of the thread is reduced from left to right, the included angle between the blade groove (43) and the thread direction of the head external thread (41) is 30-45 degrees, and the blade groove (43) is matched with the groove (7).

6. The new bone cement set screw as claimed in claim 5, characterized in that the inner angle of the flute (43) is 30 ° -55 ° and the flute depth is 0.4mm-0.8 mm.

7. The new bone cement fixing screw as claimed in claim 1, characterized in that at least 3-4 side holes (32) for injecting bone cement are provided and the side holes for injecting bone cement are arranged in a staggered manner.

8. The novel bone cement fixing screw as claimed in any one of claims 3 to 6, wherein the length of the novel bone cement fixing screw is 7-10cm, the outer diameters of the upper threads (5) of the first thread section (22), the second thread section (23) and the third thread section (24) are all 7.2mm, the outer diameter of the lower thread (6) is 7.5mm, the outer diameters of the external threads (31) are 7.2mm-7.0mm from the left to the right of the outer diameter of the upper thread (5), and the outer diameter of the lower thread (6) is 7.5mm-7.3 mm.