A strong support low stress posterior spinal fixation structure

Abstract

The utility model provides a kind of strong support low stress spinal posterior internal fixation structure, including fixed column, the auxiliary hollow column is set in the lower fixed column, the upper end of threaded column is fixedly connected with can cooperate bottom stick, the inside end of auxiliary hollow column is symmetrically opened with side inner slot in left and right two inner walls, and slidingly connected with outer push follower between two side inner slots, the lower end of outer push follower is fixedly connected with a pair of elastic connecting column, by filling medical liquid in advance in storage inner chamber, under the synergistic effect of absorbable material limiting column and elastic connecting column, along with absorbable material limiting column gradually being absorbed by human body, elastic connecting column promotes storage inner chamber to move, make it contact with sharp angle stab head, break sealed breakable piece, release liquid medicine, this process both guarantees the effective delivery of drug, promotes the recovery of spinal sick place, and also avoids the adverse effect caused by too early or too late drug release, maintains the low stress state of internal fixation structure, is favorable for the rehabilitation of patient.

Description

Technical Field

[0001] This utility model relates to a strong-support, low-stress posterior spinal fixation structure, belonging to the field of medical device technology. Background Technology

[0002] In the field of spinal surgery, posterior spinal fixation is an important method for treating various spinal diseases such as spinal fractures, spondylolisthesis, and scoliosis. The core purpose of the surgery is to provide stable support for the spine, help it restore and maintain normal anatomical structure and physiological function, and promote the rehabilitation of spinal injuries and diseases.

[0003] A bone screw device, patented in Chinese (CN218305088U), belongs to the field of orthopedic auxiliary device technology. The device includes a connecting rod with a guide groove extending along its side length. When the bone screw is not driven into the skeleton, the position of the fixing element in the guide groove can be flexibly adjusted. When the bone screw is driven into the skeleton, it is stably fixed to the connecting rod by the fixing element, which helps maintain the connection strength and stability of the bone screw during long-term use. Even if loosening occurs, it will not fall off, preventing the fixing element from slipping off the connecting rod and improving the safety performance of the bone screw device. In terms of drug therapy, traditional posterior spinal fixation structures lack an effective drug delivery mechanism. Rehabilitation of spinal injuries often requires medication to reduce inflammation and promote bone growth. However, traditional internal fixation structures cannot deliver drugs to the affected area of ​​the spine precisely and at the right time after surgery. Doctors usually have to rely on patients to take medication orally or intravenously, resulting in low drug utilization and the potential for more adverse reactions from systemic medication.

[0004] Therefore, a strong-support, low-stress posterior spinal fixation structure is proposed. Utility Model Content

[0005] In view of this, the present invention provides a strong support, low stress posterior spinal fixation structure to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial option.

[0006] The technical solution of this utility model is implemented as follows: A strong-support, low-stress posterior spinal fixation structure includes a fixation column, an auxiliary hollow column below the fixation column, a threaded column below the auxiliary hollow column, a mating base rod fixedly connected to the upper end of the threaded column, symmetrical inner grooves on the left and right inner walls of the inner end of the auxiliary hollow column, an outwardly pushing follower block slidably connected between the two inner grooves, a pair of elastic connecting columns fixedly connected to the lower end of the outwardly pushing follower block, an absorbable material limiting column filled at the lower side of the inner end of the auxiliary hollow column, a drug storage chamber placed at the inner end of the auxiliary hollow column, a sealed rupture disc fixedly connected to the lower end of the drug storage chamber, an internal docking crossbar fixedly connected to the inner end of the mating base rod, a pointed piercing head fixedly connected to the upper end of the internal docking crossbar, and the auxiliary hollow column is located between the fixation column and the threaded column.

[0007] More preferably, it can be threaded together with the base bar and the auxiliary hollow column, with the two elastic connecting columns located in the corresponding side inner slots.

[0008] More preferably, the two elastic connecting columns are fixedly connected to the corresponding inner wall of the inner groove on the side, and the upper end of the fixed column is fixedly connected to the butt column.

[0009] More preferably, the lower end of the fixed column is fixedly connected to a threaded column, and the outer end of the threaded column is provided with external threads.

[0010] More preferably, the drug storage compartment is located between the outward-pushing follower block and the absorbable material limiting post, and the sharp-angled piercing head cooperates with the sealed rupture disc.

[0011] More preferably, a pair of liquid outlet holes are provided on the outer side of the auxiliary hollow column, and the inner end of the drug storage chamber is filled with a certain amount of medical liquid.

[0012] More preferably, an anti-detachment inner ring is fixedly connected to the lower inner end of the auxiliary hollow column, and the anti-detachment inner ring is in contact with the absorbable material limiting column.

[0013] The present invention has the following advantages due to the adoption of the above technical solution: I. This utility model pre-fills the drug storage chamber with medical liquid. With the synergistic action of the absorbable material limiting column and the elastic connecting column, it achieves precise and timed drug release. As the absorbable material limiting column is gradually absorbed by the human body, the elastic connecting column pushes the drug storage chamber to move, so that it contacts the sharp-angled puncture head, puncturing the sealed ruptured piece and releasing the liquid. This process not only ensures the effective delivery of the drug and promotes the recovery of the spinal injury, but also avoids the adverse effects caused by premature or delayed drug release. At the same time, the whole process does not cause additional high-stress impact on the spine, maintaining the low-stress state of the internal fixation structure, which is beneficial to the patient's recovery.

[0014] II. This utility model, through the tight cooperation between the anti-detachment inner ring and the absorbable material limiting post, prevents the absorbable material limiting post from loosening or shifting before it is absorbed, thus ensuring the stability of the drug storage and release process. The elastic connecting post not only provides power for the movement of the drug storage chamber but also acts as a buffer when the drug storage chamber comes into contact with the sharp-angled puncture head. The synergistic effect between the above structures not only enhances the overall stability of the internal fixation structure and provides strong support, but also avoids local stress concentration through reasonable mechanical design, maintains a low stress state of the internal fixation structure during operation, extends the service life of the internal fixation device, and improves the treatment effect.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the fixed column structure of this utility model; Figure 2 This is an enlarged schematic diagram of the threaded column structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of the fixed column of this utility model; Figure 4 This is a schematic diagram of the built-in docking crossbar structure of this utility model; Figure 5 This is a schematic diagram of the auxiliary hollow column structure of this utility model; Figure 6 For the present utility model Figure 5 A schematic diagram of a partially truncated and enlarged structure of the central auxiliary hollow column.

[0018] Attached reference numerals: 1. Fixed column; 2. Connecting column; 3. Auxiliary hollow column; 4. Threaded column; 5. External thread; 6. Outward push follower block; 7. Side inner groove; 8. Elastic connecting column; 9. Drug storage chamber; 10. Sealed fragment; 11. Absorbable material limiting column; 12. Built-in connecting crossbar; 13. Sharp corner puncture head; 14. Anti-detachment inner ring; 15. Can be used with bottom bar; 16. Liquid outlet hole. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figure 1-6 As shown, this utility model embodiment provides a strong support, low stress posterior spinal fixation structure, including a fixation column 1, an auxiliary hollow column 3 below the fixation column 1, a threaded column 4 below the auxiliary hollow column 3, a mating base bar 15 fixedly connected to the upper end of the threaded column 4, side inner grooves 7 symmetrically opened on the left and right inner walls of the inner end of the auxiliary hollow column 3, an outward push follower block 6 slidably connected between the two side inner grooves 7, a pair of elastic connecting columns 8 fixedly connected to the lower end of the outward push follower block 6, an absorbable material limiting column 11 filled with the lower side of the inner end of the auxiliary hollow column 3, a drug storage chamber 9 placed in the inner end of the auxiliary hollow column 3, a sealing rupture disc 10 fixedly connected to the lower end of the drug storage chamber 9, an internal docking crossbar 12 fixedly connected to the inner end of the mating base bar 15, a pointed piercing head 13 fixedly connected to the upper end of the internal docking crossbar 12, and the auxiliary hollow column 3 is located between the fixation column 1 and the threaded column 4.

[0023] The two elastic connecting columns 8 are located in the corresponding inner grooves 7 through the threaded connection between the bottom bar 15 and the auxiliary hollow column 3. The two elastic connecting columns 8 are fixedly connected to the lower inner wall of the corresponding inner grooves 7. The upper end of the fixed column 1 is fixedly connected to the butt column 2, and the lower end of the fixed column 1 is fixedly connected to the threaded column 4. The outer end of the threaded column 4 is provided with the threaded external thread 5. The pointed puncture head 13 and the sealing rupture disc 10 cooperate with each other. A pair of liquid outlet holes 16 are opened on the outer side of the auxiliary hollow column 3.

[0024] Example 2

[0025] like Figure 3 As shown, in one embodiment, the inner end of the drug storage chamber 9 is filled with a certain amount of medical liquid, and an anti-detachment inner ring 14 is fixedly connected to the lower side of the inner end of the auxiliary hollow column 3. The anti-detachment inner ring 14 is in contact with the absorbable material limiting column 11, and the drug storage chamber 9 is located between the outward push follower block 6 and the absorbable material limiting column 11.

[0026] By setting the anti-detachment inner ring 14 to contact the absorbable material limiting post 11, its special structural design increases the friction and engagement area between the two, effectively preventing the absorbable material limiting post 11 from loosening or shifting before it is absorbed, thus ensuring the stability of the entire drug storage and release process.

[0027] In operation, during posterior spinal internal fixation surgery, the threaded column 4, after implantation, can tightly interlock with the surrounding bone tissue, providing a stable anchor point for the entire internal fixation structure. Simultaneously, the drug storage chamber 9 is pre-filled with medical medication to aid in the recovery of the spinal cord. Its lower sealing flap 10 is made of a material with sufficient strength, effectively preventing leakage of the medication under normal conditions. When the drug storage chamber 9 is placed inside the auxiliary hollow column 3, it pushes the outward-pushing follower block 6 to slide upward along the inner side slot 7. The elastic connecting column 8 at the lower end of the outward-pushing follower block 6 is compressed, storing elastic potential energy. At the same time, the absorbable material limiting column 11 limits the position of the drug storage chamber 9, preventing displacement in the early postoperative period. As the recovery time progresses after surgery, the absorbable material limiting column 11 is gradually absorbed under the body's physiological environment. At this time, the elastic connecting column 8 releases the stored elastic potential energy, pushing the outward-pushing follower block 6 upward, thereby causing the drug storage chamber 9 to move closer to the mating base rod 15. When the drug storage chamber 9 moves to a specific position, the sealing rupture disc 10 at its lower end contacts the pointed piercing head 13 at the upper end of the built-in docking crossbar 12. Due to its sharp shape, the pointed piercing head 13 generates concentrated stress when the two come into contact, puncturing the sealing rupture disc 10 and allowing the medical liquid in the drug storage chamber 9 to overflow. The overflowing medical liquid is directed to the spinal affected area through the outlet hole 16 opened on the outside of the auxiliary hollow column 3 to exert its therapeutic effect. The anti-dislodgement inner ring 14 contacts the absorbable material limiting column 11. Its special structural design increases the friction and engagement area between the two, effectively preventing the absorbable material limiting column 11 from loosening or shifting before it is absorbed, ensuring the stability of the entire drug storage and release process. The elastic connecting column 8 not only provides power for the movement of the drug storage chamber 9, but also plays a buffering role when the drug storage chamber 9 contacts the pointed piercing head 13, thereby achieving precise treatment of the spinal affected area, while maintaining strong support and low stress state of the internal fixation structure during operation.

[0028] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A strong-support, low-stress posterior spinal fixation structure, comprising a fixation column (1), characterized in that: An auxiliary hollow column (3) is provided below the fixed column (1), and a threaded column (4) is provided below the auxiliary hollow column (3). A matching bottom rod (15) is fixedly connected to the upper end of the threaded column (4). The inner walls of the auxiliary hollow column (3) are symmetrically provided with side inner slots (7). An outward push follower block (6) is slidably connected between the two side inner slots (7). A pair of elastic connecting columns (8) are fixedly connected to the lower end of the outward push follower block (6). (3) The inner end of the lower side is filled with absorbable material limiting column (11), the inner end of the auxiliary hollow column (3) is placed with drug storage chamber (9), the lower end of the drug storage chamber (9) is fixedly connected with a sealing rupture disc (10), the inner end of the mating bottom bar (15) is fixedly connected with an internal docking cross bar (12), the upper end of the internal docking cross bar (12) is fixedly connected with a sharp corner punch (13), and the auxiliary hollow column (3) is located between the fixed column (1) and the threaded column (4).

2. The strong-support, low-stress posterior spinal fixation structure according to claim 1, characterized in that: The mating bottom bar (15) and the auxiliary hollow column (3) are threaded together, and the two elastic connecting columns (8) are respectively located in the corresponding side inner slots (7).

3. The posterior spinal fixation structure with strong support and low stress according to claim 1, characterized in that: The two elastic connecting columns (8) are fixedly connected to the lower inner wall of the corresponding side inner slot (7), and the upper end of the fixed column (1) is fixedly connected to the butt column (2).

4. The strong-support, low-stress posterior spinal fixation structure according to claim 1, characterized in that: The lower end of the fixed column (1) is fixedly connected to a threaded column (4), and the outer end of the threaded column (4) is provided with threaded external threads (5).

5. The posterior spinal fixation structure with strong support and low stress according to claim 1, characterized in that: The drug storage compartment (9) is located between the outward push follower block (6) and the absorbable material limiting column (11), and the pointed puncture head (13) cooperates with the sealed rupture disc (10).

6. The strong-support, low-stress posterior spinal fixation structure according to claim 1, characterized in that: The auxiliary hollow column (3) has a pair of liquid outlet holes (16) on its outer side, and the inner end of the drug storage chamber (9) is filled with a number of medical liquids.

7. The strong-support, low-stress posterior spinal fixation structure according to claim 1, characterized in that: An anti-detachment inner ring (14) is fixedly connected to the lower inner end of the auxiliary hollow column (3), and the anti-detachment inner ring (14) is in contact with the absorbable material limiting column (11).

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