CN113729899A - Novel degradable pressurization expansion screw assembly - Google Patents

Novel degradable pressurization expansion screw assembly Download PDF

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Publication number
CN113729899A
CN113729899A CN202111158526.9A CN202111158526A CN113729899A CN 113729899 A CN113729899 A CN 113729899A CN 202111158526 A CN202111158526 A CN 202111158526A CN 113729899 A CN113729899 A CN 113729899A
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CN
China
Prior art keywords
screw
expansion
screwdriver
locking screw
expansion screw
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111158526.9A
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Chinese (zh)
Inventor
侯东杰
侯亚辉
张岚岚
杨晓东
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Zhejiang Provincial Peoples Hospital
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Zhejiang Provincial Peoples Hospital
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Priority to CN202111158526.9A priority Critical patent/CN113729899A/en
Publication of CN113729899A publication Critical patent/CN113729899A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/683—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B2017/564—Methods for bone or joint treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B2017/681—Alignment, compression, or distraction mechanisms

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Neurology (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention discloses a novel degradable compression expansion screw component, which relates to the field of medical instruments.A main body of the component is provided with an expansion screw, the expansion screw is provided with an expansion strip, the expansion screw is connected with a locking screw, the expansion screw utilizes the locking screw to act on the expansion strip, so that the expansion strip is more tightly connected with bones after being expanded, the locking screw is arranged in a storage channel arranged on the expansion screw, the locking screw comprises a near-end locking screw and a far-end locking screw, the locking screw is provided with two independent near-end locking screws and far-end locking screws which respectively act on the near end and the far end of the expansion screw, compared with the locking screw arranged in the whole component, the probability that the two independent locking screws are loosened is greatly reduced, and the strength of the near-end locking screw and the far-end locking screw acting on the expansion screw can be respectively and flexibly adjusted according to actual conditions, the operability of the doctor is greatly improved.

Description

Novel degradable pressurization expansion screw assembly
Technical Field
The invention relates to the field of medical instruments, in particular to a novel degradable compression expansion screw component.
Background
For orthopedic treatment of internal and external ankle fractures, internal and external condylar fractures of humerus and femur, femoral neck fractures and olecranal fractures, internal fixation instruments such as compression screws, kirschner wires and steel wires are commonly used. The compression screws comprise hollow double-headed compression screws, female and male screws, power compression screws and the like, and have certain positive effects. Taking the hollow double-headed compression screw as an example, most of the clinically used hollow double-headed compression screws are arranged in the sleeve or the threaded sleeve by using a thimble or a bolt, and the sleeve or the threaded sleeve expands outwards under the extrusion action of the thimble or the bolt to fasten the connection strength of the sleeve or the threaded sleeve and the bone so as to realize the fixation of the bone as shown in fig. 7. However, the whole thimble or bolt is easy to be twisted and loosened in the actual use process, so that the connection is not firm; and the force of the thimble or the bolt acting on the two ends of the sleeve or the threaded sleeve can not be flexibly adjusted, so that the acting force between the thimble or the bolt and the bone can not be adjusted according to the actual condition of the patient, and the professional technical operation of a doctor is limited by the medical instrument.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a novel degradable compression expansion screw assembly, which solves the problems that the compression screw in the existing hospital is not firmly fixed and the force at two ends cannot be independently and flexibly adjusted.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a novel degradable pressurization expansion screw subassembly, its main part is provided with the expansion screw, the expansion screw is provided with the inflation strip, the expansion screw is connected with locking screw, locking screw acts on the inflation strip, locking screw is arranged in the thing passageway of putting of seting up on the expansion screw, locking screw includes near-end locking screw and distal end locking screw, near-end locking screw and distal end locking screw are two solitary individualities, the both sides of expansion screw are arranged respectively in to near-end locking screw and distal end locking screw.
By adopting the technical scheme, the expansion screw utilizes the locking screw to act on the expansion strip, so that the expansion strip is more tightly connected with the bone after expansion, the locking screw is set into two independent proximal locking screws and distal locking screws which respectively act on the proximal end and the distal end of the expansion screw, compared with the locking screw arranged in a whole piece, the probability of loosening of the two independent locking screws is greatly reduced, the strength of the proximal locking screws and the strength of the distal locking screws acting on the expansion screws can be flexibly adjusted respectively according to actual conditions, and the operability of doctors is greatly improved.
Preferably, the proximal locking screw gauge is greater than the distal locking screw gauge.
By adopting the technical scheme, the specification of the far-end locking screw is designed to be smaller than that of the near-end locking screw, and the far-end locking screw can be normally placed in the expansion screw.
Preferably, the expansion strip is provided with a proximal expansion strip and a distal expansion strip, and the proximal expansion strip and the distal expansion strip are respectively distributed at the proximal end and the distal end of the expansion screw.
Through adopting above-mentioned technical scheme, near-end inflation strip and distal end inflation strip are connected with near-end locking screw and distal end inflation screw cooperation respectively, realize the inflation effect at inflation screw both ends.
Preferably, the expansion screw is made of a magnesium alloy material.
By adopting the technical scheme, the expansion screw made of the magnesium alloy material can be automatically degraded, and the process of taking out the expansion screw is omitted.
Preferably, the surface of the expansion screw is provided with a storage hole, and the storage hole is positioned in the middle of the expansion screw.
Through adopting above-mentioned technical scheme, utilize the thing hole of putting on expansion screw surface, can place corresponding treatment medicine in inside, follow expansion screw and get into in the patient, accelerate patient's bone healing.
Preferably, a screwdriver component is further arranged and is in fit connection with the expansion screw and the locking screw.
Through adopting above-mentioned technical scheme, screwdriver subassembly is connected with inflation screw, locking screw cooperation, can make things convenient for the process of putting into of inflation screw and locking screw.
Preferably, the screwdriver component is provided with a first screwdriver and a second screwdriver, the first screwdriver is matched with the end part of the expansion screw, the second screwdriver is matched with the far-end locking screw, and the second screwdriver is movably sleeved in the first screwdriver.
Through adopting above-mentioned technical scheme, first screwdriver is used for driving the motion of inflation screw, and imbeds the patient internal, and inside the first screwdriver was located to the second screwdriver cover, removed in first screwdriver to drive distal end locking screw and imbed the patient internal.
Preferably, the screwdriver component is provided with a third screwdriver, the third screwdriver is matched with the near-end locking screw, and the third screwdriver is movably sleeved in the first screwdriver.
By adopting the technical scheme, the third screwdriver is connected with the near-end locking screw and drives the near-end locking screw to enter the body of the patient.
Preferably, the screwdriver assembly is provided with a T-shaped handle.
Through adopting above-mentioned technical scheme, T type handle makes things convenient for the doctor to hold screwdriver subassembly, and more laborsaving.
Preferably, the expansion strip is provided with a proximal expansion strip which is not coincident with the end of the expansion screw.
Through adopting above-mentioned technical scheme, the design of near-end inflation strip position can avoid near-end inflation strip when the performance is used for, influences screwdriver subassembly and inflation screw's just productive cooperation process.
Compared with the prior art, the invention has the advantages that: (1) the expansion bolt is characterized in that a near-end locking bolt and a far-end locking bolt are respectively arranged at two ends in the expansion bolt and are respectively matched with an expansion strip on the expansion bolt, and the near-end locking bolt and the far-end locking bolt are divided into two independent units, so that the probability of the locking bolt in torsion loosening can be reduced, and the strength of the near-end locking bolt and the far-end locking bolt acting on the expansion strip can be independently adjusted, so that the actual use process of the expansion bolt is more flexible; (2) the expansion screw is made of magnesium alloy materials, so that the expansion screw can be degraded in a patient body, and the taking-out process of the expansion screw is avoided; (3) the expansion screw and the locking screw are placed into the body of a patient under the action of the screwdriver component, the operation is convenient, and the T-shaped handle is additionally arranged on the screwdriver component, so that the placing process of the expansion screw and the locking screw is more convenient and labor-saving.
Drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic structural view of the expansion screw and the locking screw in embodiment 1 after being engaged;
FIG. 3 is a schematic cross-sectional view of A in FIG. 1;
FIG. 4 is a schematic view showing the structure of the second screwdriver matched with the distal locking screw in the embodiment 1;
FIG. 5 is a schematic view showing the structure of the third screwdriver in cooperation with the proximal locking screw in the embodiment 1;
FIG. 6 is a schematic structural view of embodiment 2;
fig. 7 is a background art drawing.
In the figure: 1-an expansion screw; 110-a strip-shaped groove; 2-expansion strips; 210-a proximal expansion strip; 220-a distal expansion strip; 3-locking screws; 310-a proximal locking screw; 320-distal locking screw; 4-a placement channel; 5-a screwdriver component; 510-a first screwdriver; 520-a second screwdriver; 530-a third screwdriver; 6-T type handle; 7-external threads; 8-placing holes; 9-internal thread; 10-through groove.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1
The novel degradable compression expansion screw assembly shown in fig. 1 to 5 has a main body provided with an expansion screw 1, the surface of the expansion screw 1 is provided with an expansion strip 2, a locking screw 3 is arranged in the expansion screw 1, the locking screw 3 acts on the expansion strip 2, and the expansion strip 2 expands outwards to realize the expansion effect of the expansion screw 1.
The expansion screw 1 is placed in the bone of a patient body in the using process, the expansion screw 1 after expansion is connected with the bone of the patient more tightly, the risk of loosening and falling out during fixing can be reduced better, and the pressurizing effect can be maintained.
The expansion strip 2 is integrally formed with the expansion screw 1.
In this embodiment, the outer wall of the expansion screw 1 is provided with an external thread 7, and the expansion screw 1 is connected with the bone of the patient through the external thread 7, i.e. the expansion screw 1 is screwed into the body of the patient.
An object placing channel 4 is arranged in the expansion screw 1, and the locking screw 3 is arranged in the object placing channel 4 in a matching mode.
The expansion screw 1 is provided with a storage hole 8, therapeutic drugs can be placed in the storage hole 8, and the therapeutic drugs can enter the body of a patient along with the expansion screw 1 and act on the bone of the patient to accelerate the healing of the bone.
The object placing hole 8 is located in the middle of the expansion screw 1, the object placing hole 8 is communicated with the object placing channel 4, and therapeutic drugs can be placed in the expansion screw 1 through the object placing channel 4 and permeate into the body of a patient through the object placing hole 8, as shown in fig. 1.
The expansion screw 1 is internally provided with an internal thread 9, and the locking screw 3 is matched and connected with the internal thread 9 on the inner wall of the expansion screw 1.
The locking screw 3 is provided as a proximal locking screw 310 and a distal locking screw 320, the proximal locking screw 310 and the distal locking screw 320 are two independent units, the proximal locking screw 310 and the distal locking screw 320 are respectively disposed at the proximal end and the distal end of the expansion screw 1 and move inside the expansion screw 1 through the internal thread 9 provided on the expansion screw 1, as shown in fig. 1. The two independent bodies of the proximal locking screw 310 and the distal locking screw 320 are successively placed in the expansion screw 1 through the placement channel 4, and compared with the connection between the whole locking screw 3 and the expansion screw 1 in the background art, the probability that both the locking screw 3 and the two locking screws 3 rotate is greatly reduced, the connection stability between the locking screw 3 and the expansion screw 1 is better, and meanwhile, a doctor can respectively adjust the strength of the proximal locking screw 310 or the distal locking screw 320 acting on the expansion screw 1 according to actual conditions in clinical operation. Specifically, the opening angle of the expansion strip 2 on the expansion screw 1 can be adjusted by adjusting the position of the locking screw 3 relative to the expansion screw 1.
The proximal locking screw 310 gauge is larger than the distal locking screw 320 gauge. As shown in fig. 1 and 2, both the proximal locking screw 310 and the distal locking screw 320 are placed into the expansion screw 1 at the proximal end of the expansion screw 1, thereby facilitating the smooth placement of the distal locking screw 320 into the expansion screw 1.
The distal end of the expansion screw 1 is the end of the expansion screw 1 that is first placed in the patient, and the proximal end of the expansion screw 1 is the end opposite to the distal end.
The expansion bar 2 is provided with a proximal expansion bar 210 and a distal expansion bar 220, and the proximal expansion bar 210 and the distal expansion bar 220 are respectively positioned at the proximal end and the distal end of the expansion screw 1, as shown in fig. 1 or fig. 2. The proximal expansion bar 210 and the distal expansion bar 220 are respectively connected with the proximal locking screw 310 and the distal locking screw 320 in a matching manner.
The distal expansion bar 220 is configured as shown in fig. 1 and 2, the distal expansion bar 220 is located at the distal end of the expansion screw 1, and the distal locking screw 320 acts on the distal expansion bar 220 to expand the end of the expansion screw 1 outwards and abut against the bone of the patient.
The proximal expansion bar 210 is not coincident with the end of the expansion screw 1, as shown in fig. 1 and 2, the proximal expansion bar 210 is disposed at a position near the proximal end of the expansion screw 1, and the proximal locking screw 310 is coupled to the proximal expansion bar 210 to urge the proximal expansion bar 210 to expand outward.
The cross-sectional shape of the proximal expansion strip 210 is as shown in fig. 3, a plurality of strip-shaped grooves 110 are uniformly formed in the surface of each expansion screw 1, the expansion screws 1 adjacent to the strip-shaped grooves 110 form the proximal expansion strip 210, and when the proximal locking screw 310 presses the inner wall of the proximal expansion strip 210, the proximal expansion strip 210 can perform outward expansion movement along the diameter direction.
In the embodiment, the expansion screw 1 is made of magnesium alloy material, and when the expansion screw 1 made of magnesium alloy material is placed in a human body, the expansion screw 1 can be degraded in the human body, so that the later process of taking out the expansion screw 1 is avoided. Magnesium alloys include, but are not limited to: MgZnCa, WE43, MgZn-Sr MgZnSr, and AZ 31. The magnesium alloy having high mechanical strength is used to reduce the influence of the stress on the fixing strength of the expansion screw 1 in the storage hole 8.
A screwdriver component 5 is arranged on one side of the expansion screw 1, the screwdriver component 5 is connected with the expansion screw 1 and the locking screw 3, and the expansion screw 1 and the locking screw 3 can be placed in the body of a patient.
Specifically, as can be seen in fig. 4 and 5, the screwdriver assembly 5 includes a first screwdriver 510, and the first screwdriver 510 is coupled to the expansion screw 1 to drive the expansion screw 1 to move toward the patient.
The screwdriver assembly 5 includes a second screwdriver 520, the second screwdriver 520 being cooperatively engaged with the distal locking screw 320 to drive the distal locking screw 320 toward the patient.
The screwdriver assembly 5 further includes a third screwdriver 530, wherein the third screwdriver 530 is cooperatively engaged with the proximal locking screw 310 to drive the proximal locking screw 310 toward the patient.
The second screwdriver 520 is sleeved in the first screwdriver 510 and can move along the length direction of the first screwdriver 510. As shown in fig. 4, the first screwdriver 510 is provided with a through slot 10 along the length direction thereof, the end of the first screwdriver 510 is engaged with a predetermined position-limiting slot at the end of the expansion screw 1, and the second screwdriver 520 is disposed in the through slot 10 and is engaged with a predetermined position-limiting slot at the end of the distal locking screw 320.
The third screwdriver 530 is sleeved in the first screwdriver 510 and can move along the length direction of the first screwdriver 510. As shown in fig. 5, the first screwdriver 510 is engaged with the end of the expansion screw 1 in a predetermined position, and the third screwdriver 530 is disposed in the predetermined through slot 10 of the first screwdriver 510, and engaged with the end of the proximal locking screw 310 in a predetermined position.
Further, the screwdriver assembly 5 is provided with a T-shaped handle 6, and the T-shaped handle 6 is used for facilitating the operation of the screwdriver assembly 5 by a doctor.
The T-shaped handle 6 is provided with three T-shaped handles 6, and the three T-shaped handles 6 are respectively connected to the ends of the first, second and third screwdrivers 510, 520 and 530, as shown in fig. 4 and 5.
The doctor holds the T-shaped handle 6 at the end of the first screwdriver 510, and makes the end of the first screwdriver 510 abut against and match with the proximal end of the expansion screw 1, rotates the first screwdriver 510 to drive the expansion screw 1 to be screwed into the bone in the patient body, and keeps the position of the first screwdriver 510 unchanged; after the second screwdriver 520 is operated to penetrate through the through groove 10 of the first screwdriver 510, the end of the second screwdriver is matched and abutted against the far-end locking screw 320, the T-shaped handle 6 which holds the end of the second screwdriver 520 rotates the second screwdriver 520 to drive the far-end locking screw 320 to move right, the moving far-end locking screw 320 gradually extrudes the far-end expansion strip 220, and the far-end expansion strip 220 is expanded outwards by force to the periphery so as to strengthen the connection with the bone; after the second screwdriver 520 is operated to drive the distal locking screw 320 to the proper position, the second screwdriver 520 is removed and replaced with a third screwdriver 530, and the operation process of the third screwdriver 530 is the same as that of the second screwdriver 520.
It should be noted that distal locking screw 320 and proximal locking screw 310 may be successfully placed into expansion screw 1 through channel 10 of first driver 510 for subsequent movement.
The far-end locking screw 320 and the near-end locking screw 310 can promote the expansion screw 1 to expand outwards, and in addition, the function of blocking the therapeutic drug in the object placing channel 4 is achieved, so that the therapeutic drug can only diffuse outwards into the body of a patient through the object placing hole 8, and local healing of bones is accelerated.
The design of the proximal expansion strip 210 not to be overlapped with the end position of the expansion screw 1 can avoid the influence on the connection and matching between the expansion screw 1 and the first screwdriver 510 due to the expansion motion of the proximal expansion strip 210 when the expansion screw 1 is inserted into the proximal locking screw 310 in the process of matching with the first screwdriver 510, thereby improving the convenience and success rate of the operation.
The connecting structure and the connecting mode of the screwdriver component 5 are more suitable for minimally invasive surgery, particularly for bone connection minimally invasive surgery, and the positioning and operability in the minimally invasive surgery are better and the practicability is higher.
Example 2
This embodiment is different from embodiment 1 in that the distal expansion strip 220 is not overlapped with the distal end of the expansion screw 1, as shown in fig. 6, that is, the distal end of the expansion screw 1 is an integral body which cannot be split.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The novel degradable compression expansion screw assembly is characterized in that an expansion screw (1) is arranged on a main body of the novel degradable compression expansion screw assembly, an expansion strip (2) is arranged on the expansion screw (1), a locking screw (3) is connected to the expansion screw (1), the locking screw (3) acts on the expansion strip (2), the locking screw (3) is arranged in a storage channel (4) formed in the expansion screw (1), the locking screw (3) comprises a near-end locking screw (310) and a far-end locking screw (320), the near-end locking screw (310) and the far-end locking screw (320) are two independent bodies, and the near-end locking screw (310) and the far-end locking screw (320) are respectively arranged on two sides of the expansion screw (1).
2. The novel degradable compression expansion screw assembly of claim 1, wherein the proximal locking screw (310) gauge is larger than the distal locking screw (320) gauge.
3. Novel degradable compression expansion screw assembly according to claim 1, characterized in that the expansion strip (2) is provided with a proximal expansion strip (210) and a distal expansion strip (220), the proximal (210) and distal (220) expansion strips being distributed at the proximal and distal end of the expansion screw (1), respectively.
4. The novel degradable compression expansion screw assembly according to claim 1, characterized in that the expansion screw (1) is provided in magnesium alloy material.
5. The novel degradable compression expansion screw assembly according to claim 1, wherein the expansion screw (1) has a storage hole (8) formed on the surface thereof, and the storage hole (8) is located at the middle position of the expansion screw (1).
6. The novel degradable compression expansion screw assembly according to claim 1, further provided with a screwdriver assembly (5), wherein the screwdriver assembly (5) is connected with the expansion screw (1) and the locking screw (3) in a matching manner.
7. The novel degradable compression expansion screw assembly according to claim 6, wherein the screwdriver component (5) is provided with a first screwdriver (510) and a second screwdriver (520), the first screwdriver (510) is engaged with the end of the expansion screw (1), the second screwdriver (520) is engaged with the distal locking screw (320), and the second screwdriver (520) is movably sleeved in the first screwdriver (510).
8. The novel degradable compression expansion screw assembly according to claim 7, characterized in that the screwdriver assembly (5) is provided with a third screwdriver (530), the third screwdriver (530) cooperating with the proximal locking screw (310), the third screwdriver (530) being movably sleeved inside the first screwdriver (510).
9. Novel degradable compression expansion screw assembly according to claim 6, characterized in that the screwdriver assembly (5) is provided with a T-handle (6).
10. A novel degradable compression expansion screw assembly according to claim 6, characterized in that the expansion strip (2) is provided with a proximal expansion strip (210), the proximal expansion strip (210) being non-coincident with the expansion screw (1) end.
CN202111158526.9A 2021-09-30 2021-09-30 Novel degradable pressurization expansion screw assembly Pending CN113729899A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111158526.9A CN113729899A (en) 2021-09-30 2021-09-30 Novel degradable pressurization expansion screw assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111158526.9A CN113729899A (en) 2021-09-30 2021-09-30 Novel degradable pressurization expansion screw assembly

Publications (1)

Publication Number Publication Date
CN113729899A true CN113729899A (en) 2021-12-03

Family

ID=78742005

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111158526.9A Pending CN113729899A (en) 2021-09-30 2021-09-30 Novel degradable pressurization expansion screw assembly

Country Status (1)

Country Link
CN (1) CN113729899A (en)

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