CN112426218A - Bone cement fixation device and method - Google Patents
Bone cement fixation device and method Download PDFInfo
- Publication number
- CN112426218A CN112426218A CN202011321581.0A CN202011321581A CN112426218A CN 112426218 A CN112426218 A CN 112426218A CN 202011321581 A CN202011321581 A CN 202011321581A CN 112426218 A CN112426218 A CN 112426218A
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- bone cement
- screw
- connector
- channel
- groove
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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
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
-
- 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
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
-
- 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
-
- 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
- A61B17/8802—Equipment for handling bone cement or other fluid fillers
- A61B17/8805—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it
-
- 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
Abstract
The invention discloses a bone cement fixing device and a method, wherein the fixing device comprises a screw, a connector and a push rod, the screw comprises a screw head and a screw body, a bone cement channel is arranged in the screw body, a groove is arranged on the screw head, the connector is of a cylindrical structure, the lower end of the connector is matched with the shape of the groove, and the push rod is inserted in a cylindrical cavity of the connector; the fixing method comprises the following steps: the screw is screwed into the vertebral body, the lower end of the connector is connected to the groove, the barrel cavity of the connector is communicated with the bone cement channel, bone cement is injected into the barrel cavity, the push rod is inserted into the barrel cavity and pushes the push rod downwards, a part of the bone cement is injected into the vertebral body through the bone cement channel, and the other part of the bone cement is filled with the bone cement channel. The bone cement fixing device and the bone cement fixing method can well fix bone cement in a vertebral body, so that a treatment effect is guaranteed.
Description
Technical Field
The invention relates to the field of medical treatment, in particular to a device and a method for fixing bone cement.
Background
In the orthopedic disease of treatment osteoporosis patient (like old patient) to the centrum disease is the most common, can use medical screw usually, like pedicle of vertebral arch screw, bone nail etc. because patient's osteoporosis is comparatively loose, does not fix medical screw well, consequently the doctor can inject bone cement in patient's centrum earlier, treat on bone cement solidification back again with medical screw embedding centrum internal bone cement, then medical screw is fixed on patient's centrum. In the actual treatment process, along with the action of a patient, bone cement can shift in the vertebral body, so that the fixing effect of the medical screw is influenced, and the treatment effect is further influenced.
Disclosure of Invention
The invention aims to provide a bone cement fixing device and a bone cement fixing method, which can be used for well fixing bone cement in a vertebral body so as to ensure the treatment effect.
The bone cement fixing device comprises a screw, a connector and a push rod, wherein the screw comprises a screw head and a screw body which are sequentially arranged from top to bottom, a bone cement passage penetrating through the upper end and the lower end of the screw body is arranged in the screw body, a groove communicated with the bone cement passage is formed in the screw head, the connector is of a cylindrical structure, the lower end of the connector is matched with the shape of the groove, and the push rod is inserted into a cylindrical cavity at the upper end of the connector.
The bone cement fixing device comprises a screw body, a groove is formed in the screw body, a bone cement channel is arranged in the groove, the upper end of the screw body is communicated with the groove, the lower end of the screw body penetrates out of the lower end of the screw body, the second channel is arranged on the side wall of the lower end of the screw body, and the second channel is communicated with the first channel.
In the bone cement fixing device, the second channel is provided in a plurality, and the second channels are symmetrically arranged on two opposite sides of the screw body.
According to the bone cement fixing device, the caliber of the groove is gradually reduced from top to bottom, and the outer diameter of the lower end of the connector is gradually reduced from top to bottom.
According to the bone cement fixing device, the side wall of the groove is provided with the clamping groove.
In the bone cement fixing device, the cross section of the groove is in a regular polygon or plum blossom shape, and the cross section of the lower end of the connector is also in a regular polygon or plum blossom shape.
The bone cement fixing device comprises a screw body, wherein the upper end of the screw body is provided with threads, the lower end of the screw body is provided with threads, and the threads are screwed into cortical bone.
According to the bone cement fixing device, the screw is made of titanium alloy, degradable magnesium alloy or PEEK, and the connector is made of stainless steel or polyethylene.
The bone cement fixing method of the invention uses the bone cement fixing device, and comprises the following steps:
the screw is screwed into the vertebral body and the groove on the screw head is positioned outside the vertebral body,
the lower end of the connector is connected with the groove on the screw head, so that the cylinder cavity of the connector is communicated with the bone cement channel of the screw body,
injecting bone cement into the cylinder cavity of the connector,
the push rod is inserted into the barrel cavity at the upper end of the connector and pushed downwards, so that one part of the bone cement is injected into the vertebral body through the bone cement channel and the other part of the bone cement is filled in the bone cement channel,
and separating the connector from the screw head, and finishing fixation after the bone cement is solidified.
The bone cement fixing method in the invention, wherein the concrete steps of injecting a part of the bone cement into the vertebral body through the bone cement channel and filling the other part of the bone cement into the bone cement channel are as follows: injecting a portion of bone cement into the vertebral body through the first and second passages and filling another portion of bone cement with the first and second passages.
When the bone cement fixing device and the method are used, firstly, a screw is screwed into a vertebral body of a patient, then a connector is connected with the screw, a cylinder cavity of the connector is communicated with a bone cement channel of the screw, then, bone cement is injected into the cylinder cavity of the connector, then, a push rod is inserted into the cylinder cavity at the upper end of the connector, the push rod is pushed downwards, under the action of the push rod, one part of the bone cement is injected into the vertebral body through the bone cement channel, the other part of the bone cement is filled in the bone cement channel, the connector and a screw head are separated, and after the bone cement is solidified, the fixation is finished. In the invention, bone cement is stored in the vertebral body at the periphery of the screw, and the bone cement is also stored in the bone cement channel in the screw, so that the screw can be well fixed with the bone cement after the bone cement is solidified. Because the screw is embedded into the vertebral body in a screwing mode, the screw is not easy to displace, and because the screw is fixedly connected with the bone cement, the bone cement is not easy to displace under the restraining action of the screw. Therefore, the invention can well fix bone cement in the vertebral body, thereby ensuring the treatment effect.
The invention will be further explained with reference to the drawings.
Drawings
FIG. 1 is a front view of a screw of the bone cement fixation device of the present invention;
FIG. 2 is a top view of a screw of the bone cement fixation device of the present invention;
FIG. 3 is a front cross-sectional view of a screw of the bone cement fixation device of the present invention;
FIG. 4 is a front view of a connector of the bone cement fixation device of the present invention;
FIG. 5 is a front cross-sectional view of a connector of the bone cement fixation device of the present invention;
FIG. 6 is a front view of a push rod of the bone cement fixation device of the present invention;
FIG. 7 is a view showing a state in which the bone cement fixing device of the present invention is used (in which a vertebral body is a cross-sectional view);
FIG. 8 is a view showing a state in which the bone cement fixing device of the present invention is used (a lateral view of a vertebral body is shown);
FIG. 9 is a further top view of a screw of the bone cement fixation device of the present invention;
fig. 10 is another front view of the coupling head of the bone cement fixture according to the present invention.
Detailed Description
As shown in fig. 1 and fig. 2-10, the bone cement fixing device of the present invention includes a screw 1, a connector 2 and a push rod 3, wherein the screw 1 includes a screw head 101 and a screw body 102 which are sequentially arranged from top to bottom, a bone cement passage penetrating through the upper end and the lower end of the screw body 102 is arranged in the screw body 102, a groove 104 communicated with the bone cement passage is arranged on the screw head 101, the connector 2 is of a cylindrical structure, the lower end 201 of the connector 2 is matched with the shape of the groove 104, the push rod 3 is inserted into a cylindrical cavity 202 at the upper end of the connector 2, and the shape of the push rod 3 is matched with the shape of the cylindrical cavity 202.
As shown in fig. 6, 7 and 8, the push rod 3 is T-shaped, and the lower end of the push rod 3 is inserted into the barrel cavity 202 at the upper end of the connector 2, so that the push rod 3 is T-shaped, which facilitates pushing the push rod 3 along the barrel cavity 202 of the connector 2.
As shown in fig. 3, the bone cement fixing device of the present invention, wherein the bone cement passage includes a first passage 103 and a second passage 106, the first passage 103 is disposed along an axial direction of the screw body 102, an upper end of the first passage 103 is communicated with the groove 104, a lower end of the first passage 103 penetrates through a lower end of the screw body 102, the second passage 106 is provided on a side wall of the lower end of the screw body 102, and the second passage 106 is communicated with the first passage 103.
As shown in fig. 3, the bone cement fixing device of the present invention, wherein the second channel 106 is provided in a plurality, and the second channels 106 are symmetrically arranged on two opposite sides of the screw body 102. In the present embodiment, the number of the second channels 106 is 6, that is, 3 second channels 106 are respectively provided on two opposite sides of the screw body 102, and each second channel 106 is arranged in a radial direction of the screw body 102.
As shown in fig. 2, and as shown in fig. 3 and 9, in the bone cement fixing device of the present invention, the caliber of the groove 104 gradually decreases from top to bottom, and the outer diameter of the lower end 201 of the connector 2 gradually decreases from top to bottom. In this way, the lower end 201 of the connector 2 is easily inserted into the groove 104 for connection therewith, and meanwhile, in order to make the connection between the lower end 201 of the connector 2 and the groove 104 more tight, an interference fit is formed therebetween.
As shown in fig. 2 and 9, in the bone cement fixing device of the present invention, a locking groove 105 is formed on a sidewall of the groove 104. When screwing the screw 1 into the vertebral body 4, a tool needs to be used to rotate the screw 1, specifically: the tool is caught in the recess 104 of the screw 1 and rotated. In order to make the tool and the groove 104 tightly engaged, a locking groove 105 is formed on the sidewall of the groove 104, so that the tool is locked in the locking groove 105, which facilitates the rotation of the screw 1.
In the bone cement fixing device, the cross section of the groove 104 is in a regular polygon or plum blossom shape, and the cross section of the lower end 201 of the connector 2 is also in a regular polygon or plum blossom shape. As shown in fig. 2 and 4, the cross section of the groove 104 is a regular hexagon, and correspondingly, the cross section of the lower end 201 of the connecting head 2 is also a regular hexagon. As shown in fig. 9 and 10, the cross section of the groove 104 may be quincunx, and correspondingly, the cross section of the lower end 201 of the connector 2 is also quincunx. The cross-section of the recess 104 and the cross-section of the lower end 201 of the connection head 2 may be formed in other shapes, such as irregular polygons, etc., besides the regular polygons and the quincunx shapes described above.
As shown in fig. 1, the bone cement fixing device according to the present invention, wherein the upper end of the screw body 102 is a cortical bone thread, the lower end of the screw body 102 has a pitch greater than that of the upper end, and the lower end has a pitch about twice as large as that of the upper end. The cortical bone threads on the screw body 102 are uniform in shape and length as compared to the cortical bone threads on existing cortical screws. By providing the cortical bone thread on the screw body 102, the screw 1 can be brought into sufficient contact with the vertebral body 4, the stability of the screw 1 is improved, and the effect of fixing the bone cement 5 is further improved.
In the bone cement fixing device, the screw 1 is made of titanium alloy, degradable magnesium alloy or PEEK, and the connector 2 is made of stainless steel or polyethylene. In the present embodiment, the screw 1 has a diameter of 6.5 mm and a length of 40-45 mm.
As shown in fig. 7 and 8, the bone cement fixing method according to the present invention, which uses the bone cement fixing device, includes the steps of:
the screw 1 is screwed into the vertebral body 4 with the recess 104 in the screw head 101 outside the vertebral body 4,
the lower end 201 of the connector 2 is connected to the groove 104 on the screw head 101 (i.e. the lower end 201 of the connector 2 is inserted into the groove 104), so that the barrel cavity 202 of the connector 2 is communicated with the bone cement channel of the screw body 102,
the push rod 3 is inserted into the barrel cavity 202 at the upper end of the connector 2, and the push rod 3 is pushed downwards, so that one part of the bone cement 5 is injected into the vertebral body 4 through the bone cement channel, and the other part of the bone cement 5 is filled in the bone cement channel,
and separating the connector 2 from the screw head 101, and finishing the fixation after the bone cement 5 is cured.
As shown in fig. 7 and 8, the bone cement fixing method according to the present invention, wherein the step of injecting a portion of the bone cement 5 into the vertebral body 4 through the bone cement passage and filling another portion of the bone cement 5 into the bone cement passage comprises the steps of: a portion of the bone cement 5 is injected into the vertebral body 4 through the first passage 103 and the second passage 106, and another portion of the bone cement 5 fills the first passage 103 and the second passage 106.
As shown in figures 7 and 8, when the bone cement fixing device and the method are used, firstly, the screw 1 is screwed into the vertebral body 4 of a patient, then the connector 2 is connected with the screw 1, the barrel cavity 202 of the connector 2 is communicated with the bone cement channel of the screw 1, then the bone cement 5 is injected into the barrel cavity 202 of the connector 2, then the push rod 3 is inserted into the barrel cavity 202 at the upper end of the connector 2, the push rod 3 is pushed downwards, under the action of the push rod 3, one part of the bone cement 5 is injected into the vertebral body 4 through the bone cement channel, the other part of the bone cement is filled in the bone cement channel, the connector 2 and the screw head 101 are separated, and the fixation is completed after the bone cement 5 is solidified. In the present invention, since the bone cement 5 is present in the vertebral body 4 around the screw 1 and the bone cement 5 is also present in the bone cement passage in the screw 1, the screw 1 can be well fixed to the bone cement 5 after the bone cement 5 is cured. Because the screw 1 is embedded into the vertebral body 4 in a screwing mode, the screw 1 is not easy to displace, and because the screw 1 is fixedly connected with the bone cement 5, the bone cement 5 is not easy to displace under the restraining action of the screw 1. Therefore, the bone cement fixing device can well fix the bone cement 5 in the vertebral body 4, so that the treatment effect is ensured.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A bone cement fixing device which is characterized in that: including screw, connector and push rod, the screw includes screwhead and the screw body that arranges in proper order from top to bottom, this internal bone cement passageway that runs through the upper and lower extreme of screw body that is equipped with of screw, be equipped with the recess that is linked together with the bone cement passageway on the screwhead, the connector is tubular structure, the lower extreme of connector with the shape phase-match of recess, the upper end section of thick bamboo intracavity of connector alternates and is equipped with the push rod.
2. The bone cement fixation device of claim 1, wherein: the bone cement channel comprises a first channel and a second channel, the first channel is arranged along the axial direction of the screw body, the upper end of the first channel is communicated with the groove, the lower end of the first channel penetrates out of the lower end of the screw body, the second channel is arranged on the side wall of the lower end of the screw body, and the second channel is communicated with the first channel.
3. The bone cement fixation device of claim 2, wherein: the second channels are arranged in a plurality of numbers, and the second channels are symmetrically arranged on two opposite sides of the screw body.
4. The bone cement fixation device of claim 3, wherein: the bore of the groove is gradually reduced from top to bottom, and the outer diameter of the lower end of the connector is gradually reduced from top to bottom.
5. The bone cement fixation device of claim 4, wherein: and a clamping groove is arranged on the side wall of the groove.
6. The bone cement fixation device of claim 5, wherein: the cross section of recess is regular polygon or plum blossom form, the lower extreme cross section of connector also is regular polygon or plum blossom form.
7. The bone cement fixation device of claim 6, wherein: the thread at the upper end of the screw body is a cortical bone thread, and the thread pitch of the thread at the lower end of the screw body is larger than that of the thread at the upper end.
8. The bone cement fixation device of claim 7, wherein: the screw adopts titanium alloy, degradable magnesium alloy or PEEK to make, the connector adopts stainless steel or polyethylene to make.
9. A bone cement fixation method using the bone cement fixation device according to any one of claims 1 to 8, comprising the steps of:
the screw is screwed into the vertebral body and the groove on the screw head is positioned outside the vertebral body,
the lower end of the connector is connected with the groove on the screw head, so that the cylinder cavity of the connector is communicated with the bone cement channel of the screw body,
injecting bone cement into the cylinder cavity of the connector,
the push rod is inserted into the barrel cavity at the upper end of the connector and pushed downwards, so that one part of the bone cement is injected into the vertebral body through the bone cement channel and the other part of the bone cement is filled in the bone cement channel,
and separating the connector from the screw head, and finishing fixation after the bone cement is solidified.
10. The bone cement fixation method as claimed in claim 9, wherein said step of injecting a portion of bone cement into the vertebral body through said bone cement passage and filling another portion of bone cement into said bone cement passage comprises the steps of: injecting a portion of bone cement into the vertebral body through the first and second passages and filling another portion of bone cement with the first and second passages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011321581.0A CN112426218A (en) | 2020-11-23 | 2020-11-23 | Bone cement fixation device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011321581.0A CN112426218A (en) | 2020-11-23 | 2020-11-23 | Bone cement fixation device and method |
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| Publication Number | Publication Date |
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| CN112426218A true CN112426218A (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011321581.0A Pending CN112426218A (en) | 2020-11-23 | 2020-11-23 | Bone cement fixation device and method |
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| CN111685863A (en) * | 2020-06-01 | 2020-09-22 | 莆田学院附属医院（莆田市第二医院） | Bone cement channel pedicle of vertebral arch ground anchor |
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Application publication date: 20210302 |