CN111281522B - Distal plug assembly for fixing bone cement type femoral stem - Google Patents
Distal plug assembly for fixing bone cement type femoral stem Download PDFInfo
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- CN111281522B CN111281522B CN202010177014.6A CN202010177014A CN111281522B CN 111281522 B CN111281522 B CN 111281522B CN 202010177014 A CN202010177014 A CN 202010177014A CN 111281522 B CN111281522 B CN 111281522B
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- 239000002639 bone cement Substances 0.000 title abstract description 43
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 8
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 10
- 210000000689 upper leg Anatomy 0.000 abstract description 9
- 230000004888 barrier function Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 208000005189 Embolism Diseases 0.000 description 2
- 210000001185 bone marrow Anatomy 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000020089 femoral neck fracture Diseases 0.000 description 1
- 210000001981 hip bone Anatomy 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- 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
- A61B17/8841—Tools specially adapted to engage a prosthesis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4601—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for introducing bone substitute, for implanting bone graft implants or for compacting them in the bone cavity
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Physical Education & Sports Medicine (AREA)
- Cardiology (AREA)
- Surgery (AREA)
- Vascular Medicine (AREA)
- Molecular Biology (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
The invention provides a distal plug assembly for fixing a bone cement type femoral stem, which comprises a plug sleeve, a plug shaft, a pushing structure and a pressing structure; the pushing structure is connected with the plug bush, the plug bush is pushed into the marrow cavity, the plug bush is stopped to a proper position after crossing the isthmus, then the plug shaft is plugged into the hollow cavity of the pushing structure, the pressing structure penetrates through the hollow cavity of the pushing structure to apply force to the plug shaft, the plug shaft is pushed to be inserted into the plug bush, the inner wall of the plug bush is extruded, the plug bush is expanded, and the plug bush is extruded and fixed in the marrow cavity; the plug shaft and the plug sleeve form a barrier together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microcosmic interlocking is formed between the bone cement and loose bone of the femur, so that the femur stem is firmly fixed; the distal plug assembly of the invention can pass through isthmus and can be firmly fixed in the marrow cavity to form reliable obstruction, thereby facilitating the application of force to bone cement and improving the operation effect.
Description
Technical Field
The invention relates to the technical field of auxiliary tools for fixing bone cement type femoral stems, in particular to a distal plug component for fixing bone cement type femoral stems.
Background
With the aging aggravation of the modern society, the femoral neck fracture of the aged is more and more frequent. In order to relieve the pain of the patient and improve the life quality of the patient, hip joint replacement becomes the first-choice treatment method. Of the elderly patients, a substantial proportion of patients require a bone cement femoral stem. The bone cement type femoral stem is installed by firstly placing a far end plug in a femoral medullary cavity (the position of the far end of the femoral stem is about 2 cm), then beating the dough-shaped bone cement into the femoral medullary cavity, and placing the femoral stem after proper pressurization to achieve firm fixation, thereby ensuring long-term use of the femoral stem.
The far end plug has the functions of forming a barrier in the femoral medullary cavity, preventing bone cement from flowing to the far end in the medullary cavity when bone cement is driven in, avoiding damaging bone marrow at the far end in the femoral medullary cavity and reducing the consumption of the bone cement; more importantly, after the bone cement is driven in, the bone cement needs to be pressurized properly, so that sufficient microcosmic interlocking is formed between the bone cement and loose bone of the femur, thereby firmly fixing the femoral stem and ensuring the long-term use of the femoral stem; if the far end plug is not arranged, the pressure cannot be well applied, so that bone cement and loose bone of the femur cannot be well locked, the femur is fixed loose, the femur is easy to loosen, and the service time is influenced.
The femoral medullary cavity is characterized by a isthmus at about 1/3 of the proximal end of the femoral medullary cavity, a narrower medullary cavity at the isthmus site, a wider anterior and posterior medullary cavity at the isthmus, and a femoral stem having a distal end beyond the isthmus for effective fixation, as well as a distal plug to be placed beyond the isthmus.
At present, the distal plug cannot be firmly fixed after being placed, bone cement cannot be effectively blocked, pressurization of the bone cement is affected, and finally fixation firmness of a femoral stem is affected.
For example, chinese patent document CN2657611Y discloses an artificial hip bone cement distal plug comprising a central shaft post and a ring piece, wherein the diameter of the ring piece is arranged on the central shaft post in a taper manner from large to small; also, for example, chinese patent document CN202161390U discloses a femoral medullary cavity plug comprising a guide cone, a central hole, a fixing boss and an open slot, the guide cone being divided into an inner medullary cavity flap and an outer medullary cavity flap; the center of the femoral marrow cavity embolus is provided with a center hole, a thin wall is formed by the femoral marrow cavity embolus and the guide cone, and the upper end of the guide cone is provided with an open slot. The above-mentioned prior art cannot solve the above-mentioned technical problem well, namely because of the existence of isthmus position, can pass the distal end stopper of isthmus and can not firmly fix in the intramedullary cavity inside, can firmly fix the distal end plug can not pass the isthmus again.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the technical defect that the distal plug in the prior art cannot simultaneously pass through the isthmus and can be firmly fixed in the intramedullary cavity, so as to provide the distal plug assembly for fixing the bone cement type femoral stem, which can achieve the purposes.
To this end, the present invention provides a bone cement-type distal plug assembly for femoral stem fixation, comprising:
the plug sleeve is hollow and is suitable for being installed into the marrow cavity, and one end of the plug sleeve can expand after being extruded;
the plug shaft can be inserted into the plug sleeve and is extruded to expand the plug sleeve;
the pushing structure is provided with a hollow inner cavity and can be detachably connected with the plug sleeve;
the pressing structure can penetrate through the hollow inner cavity to apply force to the plug shaft so as to push the plug shaft to be inserted into the plug sleeve.
As a preferred aspect, the sleeve includes:
a cylindrical main body;
the first connecting structure is arranged at one end of the cylindrical main body and is used for being detachably connected with the propelling structure;
and at least two longitudinal cuts are arranged on the other end of the cylindrical main body and extend for a certain length to divide the corresponding part of the cylindrical main body into at least two flaps.
As a preferable mode, the outer diameter of the cylindrical body is uniform and the inner diameter is gradually reduced along the insertion direction.
As a preferable scheme, a plurality of annular elastic sheets are uniformly arranged on the outer wall of the cylindrical main body;
in the portion where the longitudinal slit is provided, the ring-shaped elastic sheet is also cut by the longitudinal slit;
at least one circle of annular elastic sheet is arranged at the part which is not provided with the longitudinal notch.
As a preferable mode, the annular elastic piece is provided with two circles at a part where the longitudinal notch is not provided.
As a preferable scheme, one end of the hollow inner cavity of the propelling structure is provided with an internal thread;
the first connecting structure is an external thread arranged on the outer wall of one end of the cylindrical main body, and the external thread can be in fit and threaded connection with the internal thread.
As a preferred aspect, the plug shaft includes:
the plug shaft main body can be inserted into the plug sleeve; the plug shaft body has an outer diameter greater than an inner diameter of the cylindrical body.
As a preferred aspect, the present invention further includes an anti-falling structure, including:
the anti-drop groove is formed on the inner wall of the cylindrical main body;
and the anti-falling clamping ring is arranged on the outer wall of the plug shaft.
As a preferred embodiment, the plug body is cylindrical or conical.
As a preferred aspect, the pressing structure includes a pressing shaft that can pass through the hollow cavity of the pushing structure to apply force to the plug shaft.
The technical scheme provided by the invention has the following advantages:
1. the invention relates to a distal plug component for fixing a bone cement type femoral stem, which comprises a plug sleeve, a plug shaft, a pushing structure and a pressing structure; the pushing structure is connected with the plug sleeve, the plug sleeve is pushed into the marrow cavity, the plug sleeve is stopped to a proper position after crossing the isthmus, then the plug shaft is plugged into the hollow cavity of the pushing structure, the pressing structure penetrates through the hollow cavity of the pushing structure to apply force to the plug shaft, the plug shaft is pushed to be inserted into the plug sleeve, and after the plug shaft is inserted into the plug sleeve, the inner wall of the plug sleeve is extruded, so that the plug sleeve is expanded and extruded and fixed in the marrow cavity; the plug shaft and the plug sleeve form a barrier together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microcosmic interlocking is formed between the bone cement and loose bone of the femur, so that the femur stem is firmly fixed; the distal plug assembly of the invention can pass through isthmus and can be firmly fixed in the marrow cavity to form reliable obstruction, thereby facilitating the application of force to bone cement and improving the operation effect.
2. The distal plug assembly comprises a cylindrical main body, wherein a first connecting structure is arranged at one end of the cylindrical main body and is used for being detachably connected with a pushing structure, and at least two longitudinal cuts are arranged at the other end of the cylindrical main body and extend for a certain length to divide the corresponding part of the cylindrical main body into at least two petals; when the plug shaft is inserted into the cylindrical main body, the inner wall of the cylindrical main body is extruded, and the cylindrical main body with at least two petals expands to the periphery, so that the plug shaft is extruded and fixed on the inner wall of the marrow cavity, and firm fixation is formed.
3. The outer diameter of the cylindrical main body is uniform, and the inner diameter of the cylindrical main body is gradually reduced along the insertion direction; the outer diameter is uniform, so that the gap between the outer wall of the plug sleeve and the inner wall of the medullary cavity can be kept in a smaller range all the time, and effective blocking is realized; the internal diameter reduces gradually along the direction of inserting, makes things convenient for the stopper axle to insert the time and interact with the stopper axle, outwards expands, and the back is reduced gradually to the internal diameter in addition, and the front end of tube-shape main part gradually seals, forms a blunt end, can reduce the injury to the marrow.
4. The outer wall of the cylindrical main body is uniformly provided with a plurality of annular elastic pieces, and the annular elastic pieces have the functions of auxiliary fixation and blocking; the annular elastic sheet is provided with at least one circle of complete annular elastic sheet which is not cut by the longitudinal incision, so that the blocking can be better formed, and bone cement leakage is prevented (because the bone cement is in a dough shape, the annular elastic sheet which is not cut by the longitudinal incision has smaller gaps between the periphery and the inner wall of a marrow cavity, but can be used for effectively blocking the bone cement, and a plurality of annular elastic sheets which are cut by the longitudinal incision are also used for layer-by-layer auxiliary blocking in the follow-up process.
5. The distal plug assembly is characterized in that the pushing structure and the plug sleeve are in threaded connection through the threaded structure, are combined during pushing, and are reversely withdrawn after being fixed.
6. The distal plug assembly further comprises an anti-falling structure, in particular an anti-falling groove arranged on the inner wall of the cylindrical main body, and an anti-falling clamping ring arranged on the outer wall of the plug shaft, wherein the anti-falling structure can prevent the plug shaft from sliding out under pressure, so that firm fixation can be ensured.
Drawings
In order to more clearly illustrate the technical solutions in the prior art or in the embodiments of the present invention, the following brief description is given of the drawings used in the description of the prior art or the embodiments.
Fig. 1 is a schematic view showing the overall structure of a distal plug assembly for bone cement type femoral stem fixation in example 1 of the present invention.
Fig. 2 is an exploded schematic view of the structure of fig. 1.
Fig. 3 is a perspective view of the sleeve of fig. 1.
Fig. 4 is another perspective view of fig. 3.
Fig. 5 is a perspective view of the plug shaft of fig. 1.
Fig. 6 is an exploded view of a distal plug assembly for bone cement-type femoral stem fixation in example 2.
Fig. 7 is a perspective view of the plug shaft of fig. 6.
Reference numerals: 1. a plug sleeve; 11. a cylindrical main body; 12. a first connection structure; 13. a longitudinal incision; 14. an annular spring plate; 15. an anti-drop groove; 2. a plug shaft; 20. a plug shaft body; 21. an anti-falling clamping ring; 22. a flange; 3. a propulsion structure; 31. a hollow interior cavity; 4. a pressing structure; 41. pressing the shaft.
Detailed Description
The following describes the technical scheme of the invention in detail.
Example 1
This embodiment provides a distal plug assembly for bone cement femoral stem fixation, as shown in fig. 1-2, comprising: the plug sleeve 1 is hollow and is suitable for being installed into the marrow cavity, and one end of the plug sleeve can be expanded after being extruded; a plug shaft 2 which can be inserted into the plug sleeve 1 and is extruded to expand one end of the plug sleeve 1; a pushing structure 3 having a hollow inner cavity 31 detachably connected with the plug sleeve 1 for pushing the plug sleeve 1 into the intramedullary cavity; the pressing structure 4 can penetrate through the hollow inner cavity 31 to apply force to the plug shaft 2, so as to push the plug shaft 2 to be inserted into the plug sleeve 1.
When the bone cement type distal plug assembly for fixing the femoral stem of the embodiment is used, firstly, the pushing structure 3 is combined with the plug sleeve 1, the plug sleeve 1 is pushed into the intramedullary cavity, the bone cement type distal plug assembly stops to a proper position after crossing the isthmus, then the plug shaft 2 is plugged into the hollow cavity 31 of the pushing structure 3, the pressing structure 4 is used for penetrating through the hollow cavity 31 of the pushing structure 3 to apply force to the plug shaft 2, the plug shaft 2 is pushed to be inserted into the plug sleeve 1, and after the plug shaft 2 is inserted into the plug sleeve 1, the inner wall of the plug sleeve 1 is extruded, so that one end of the plug sleeve 1 is expanded and is extruded and fixed in the intramedullary cavity; the plug shaft 2 and the plug sleeve 1 form a barrier together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microcosmic interlocking is formed between the bone cement and loose bone of the femur, so that the femoral stem is firmly fixed; the distal plug assembly of this embodiment can pass the isthmus, can firmly fix in the intramedullary canal again, forms reliable separation, and the convenience is applied to bone cement application of force, can improve the operation effect.
As shown in fig. 3, the sleeve 1 includes: a tubular body 11; a first connection structure 12 provided at one end of the cylindrical body 11 for detachable connection with the propulsion structure 3; longitudinal slits 13, 4, are provided on the other end of the cylindrical body 11 and extend for a certain length, dividing the corresponding portion of the cylindrical body 11 into 4 lobes. When the plug shaft 2 is inserted into the cylindrical body 11, the inner wall of the cylindrical body 11 is pressed, and the cylindrical body 11 of the 4-flap is expanded to the periphery, so that the plug shaft is pressed and fixed on the inner wall of the medullary cavity, and the fixation is firmly formed.
The outer diameter of the cylindrical body 11 is uniform and the inner diameter is gradually reduced in the insertion direction. The outer diameter is uniform, so that the gap between the outer wall of the plug sleeve 1 and the inner wall of the medullary cavity can be kept in a smaller range all the time, and effective blocking is realized; the inner diameter gradually decreases along the insertion direction, so that the plug shaft 2 can conveniently interact with the plug shaft 2 when being inserted, and can expand outwards, in addition, after the inner diameter gradually decreases, the front end of the cylindrical main body 11 is gradually closed, a blunt end is formed, and the damage to bone marrow can be reduced.
A plurality of annular elastic sheets 14 are uniformly arranged on the outer wall of the cylindrical main body 11; in the portion where the longitudinal slit 13 is provided, the ring spring 14 is also cut by the longitudinal slit 13; at a portion where the longitudinal slit 13 is not provided, the ring spring 14 is provided with at least one turn. The annular elastic sheet 14 has the functions of auxiliary fixation and blocking; the annular elastic sheet 14 is provided with at least one circle of complete annular elastic sheet 14 which is not cut by the longitudinal incision and can better form a barrier to prevent bone cement leakage (because the bone cement is in a dough shape, the annular elastic sheet 14 which is not cut by the longitudinal incision 13 has small gaps between the periphery and the inner wall of a marrow cavity, but can form effective barrier to the bone cement, and a plurality of annular elastic sheets 14 which are cut by the longitudinal incision 13 are in the follow-up layer-by-layer auxiliary barriers).
In this embodiment, the annular elastic piece 14 is provided with two turns at a portion where the longitudinal slit 13 is not provided.
As shown in fig. 2, one end of the hollow cavity 31 of the propulsion structure 3 is provided with an internal thread; the first connection structure 12 is an external thread provided on an outer wall of one end of the cylindrical main body 11, and the external thread can be in threaded connection with the internal thread in a matching manner. Combine when advancing, reverse and withdraw after fixing.
As shown in fig. 5, the plug shaft 2 includes: a plug main body 20 which can be inserted into the plug bush 1; the plug body 20 has an outer diameter larger than an inner diameter of the cylindrical body 11.
As shown in fig. 4 and 5, the anti-falling structure further comprises: a drop-off preventing groove 15 formed in the inner wall of the tubular body 11; an anti-drop snap ring 21 is provided on the outer wall of the plug shaft 2. The setting of anticreep structure can prevent that stopper axle 2 from sliding out plug bush 1 under pressure to can guarantee firm fixed.
In this embodiment, the plug body 20 is cylindrical.
The pressing structure 4 comprises a pressing shaft 41, and the pressing shaft 41 can pass through the hollow cavity 31 of the pushing structure 3 to apply force to the plug shaft 2.
The method of using the distal plug assembly in this embodiment is as follows:
the pushing structure 3 is in threaded combination with the plug sleeve 1, the plug sleeve 1 is pushed into the marrow cavity by the hand-held pushing structure 3, and the hand-held pushing structure stops at a proper position after crossing the isthmus position; then, the plug shaft 2 is plugged into the hollow inner cavity 31 of the pushing structure 3, the pressing structure 4 is used, the pressing shaft 41 penetrates through the hollow inner cavity 31 of the pushing structure 3 to apply force to the plug shaft 2, and the plug shaft 2 is pushed to be inserted into the plug sleeve 1; if the resistance is too large to insert, the plug bush 1 can be moved up and down by holding the pushing structure 3 and adjusted to other positions, and then the pressing structure 4 is used for pressing the plug shaft 2 until the plug shaft 2 presses the plug bush 1 to be firmly fixed in the marrow cavity, and the anti-falling clamping ring 21 on the outer wall of the plug shaft 2 is clamped with the anti-falling groove 15 on the inner wall of the plug bush 1; after the fixing is completed, the pressing structure 4 is pulled out, the pushing structure 3 is reversed, the pushing structure 3 and the plug sleeve 1 are disconnected by threads, and the pushing structure 3 is pulled out.
Example 2
The present embodiment provides a bone cement type femoral stem distal plug assembly, which is an improvement on the basis of embodiment 1, as shown in fig. 6 and 7, and is different in that the plug body 20 of the plug 2 in this embodiment is conical, and the outer diameter of the conical is larger than the inner diameter of the plug sleeve 1 at the corresponding position by a certain set size. When the conical plug shaft 2 is completely inserted into the plug sleeve 1, the plurality of anti-falling structures are clamped, and the anti-falling capacity is stronger.
In addition, the end of the plug shaft 2, which is not inserted into the plug sleeve 1, is provided with a flange 22, and when the plug shaft 2 is completely inserted into the plug sleeve 1, the flange 22 just covers the upper opening of the cylindrical main body 11, so that better sealing can be realized.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. A distal plug assembly for bone cement-type femoral stem fixation, characterized in that: comprising the following steps:
the plug bush (1), cavity is suitable for the installation and enters into the marrow cavity inside, and one end inside can expand after being extruded, includes: a tubular main body (11); a first connecting structure (12) comprising an external thread provided on an outer wall of one end of the cylindrical body (11); at least two longitudinal cuts (13) which are arranged on the other end of the cylindrical main body (11) and extend for a certain length to divide the corresponding part of the cylindrical main body (11) into at least two flaps;
a plug shaft (2) which can be inserted into the plug sleeve (1) and is extruded to expand the plug sleeve (1); the end part of the plug shaft (2) which is not inserted into the plug sleeve (1) is provided with a flange (22), and when the plug shaft (2) is completely inserted into the plug sleeve (1), the flange (22) just covers the upper opening of the cylindrical main body (11);
the propelling structure (3) is provided with a hollow inner cavity (31), one end of the hollow inner cavity (31) is provided with an internal thread, and the internal thread can be in matched threaded connection with the external thread;
the pressing structure (4), the pressing structure (4) comprises a pressing shaft (41), the pressing shaft (41) can penetrate through the hollow inner cavity (31) of the pushing structure (3) to apply force to the plug shaft (2), and the plug shaft (2) is pushed to be inserted into the plug sleeve (1);
when the device is used, the pushing structure (3) is in threaded combination with the plug sleeve (1), the plug sleeve (1) is pushed into the marrow cavity by holding the pushing structure (3), and the device stops at a proper position after crossing the isthmus position; then, the plug shaft (2) is plugged into the hollow inner cavity (31) of the pushing structure (3), the pressing structure (4) is used, the pressing shaft (41) passes through the hollow inner cavity (31) of the pushing structure (3), the plug shaft (2) is forced, and the plug shaft (2) is pushed to be inserted into the plug sleeve (1); if the resistance is too large to insert, the pushing structure (3) can be held by hands to move the plug sleeve (1) up and down, the plug sleeve is adjusted to other positions, and the pressing structure (4) is used for pressing the plug shaft (2) until the plug shaft (2) presses the plug sleeve (1) to be firmly fixed in the medullary cavity.
2. The distal plug assembly of claim 1, wherein: the outer diameter of the cylindrical main body (11) is uniform and the inner diameter thereof is gradually reduced along the insertion direction.
3. The distal plug assembly of claim 1, wherein: a plurality of annular elastic sheets (14) are uniformly arranged on the outer wall of the cylindrical main body (11);
in the portion provided with the longitudinal slit (13), the annular elastic sheet (14) is also cut by the longitudinal slit (13);
at a portion where the longitudinal slit (13) is not provided, the annular elastic piece (14) is provided with at least one turn.
4. A distal plug assembly according to claim 3, wherein: at the part not provided with the longitudinal notch (13), the annular elastic sheet (14) is provided with two circles.
5. The distal plug assembly of claim 1, wherein: the plug shaft (2) comprises:
a plug shaft main body (20) which can be inserted into the plug sleeve (1); the plug shaft body (20) has an outer diameter larger than an inner diameter of the cylindrical body (11).
6. The distal plug assembly of claim 5, wherein: still include anticreep structure, include:
an anti-drop groove (15) which is arranged on the inner wall of the tubular main body (11);
and the anti-falling clamping ring (21) is arranged on the outer wall of the plug shaft (2).
7. The distal plug assembly of claim 6, wherein: the plug shaft body (20) is cylindrical or conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010177014.6A CN111281522B (en) | 2020-03-13 | 2020-03-13 | Distal plug assembly for fixing bone cement type femoral stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010177014.6A CN111281522B (en) | 2020-03-13 | 2020-03-13 | Distal plug assembly for fixing bone cement type femoral stem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111281522A CN111281522A (en) | 2020-06-16 |
| CN111281522B true CN111281522B (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010177014.6A Active CN111281522B (en) | 2020-03-13 | 2020-03-13 | Distal plug assembly for fixing bone cement type femoral stem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111281522B (en) |
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|---|---|---|---|---|
| US4447915A (en) * | 1981-02-18 | 1984-05-15 | Sulzer Brothers Limited | Expandable medullary canal plug |
| US4776330A (en) * | 1986-06-23 | 1988-10-11 | Pfizer Hospital Products Group, Inc. | Modular femoral fixation system |
| US5935169A (en) * | 1997-02-13 | 1999-08-10 | Chan; Kwan-Ho | Bone cement plug for deployment in a bone canal |
| CN102098969A (en) * | 2008-07-17 | 2011-06-15 | 史密夫和内修有限公司 | Surgical devices |
| CN202920414U (en) * | 2012-12-05 | 2013-05-08 | 嘉思特华剑医疗器材(天津)有限公司 | Central mounting device |
| CN106063715A (en) * | 2015-04-22 | 2016-11-02 | 德普伊新特斯产品公司 | Biceps brachii m. prosthetic device |
| CN211911782U (en) * | 2020-03-13 | 2020-11-13 | 山东大学齐鲁医院(青岛) | Distal end plug for femoral stem fixation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8623019B2 (en) * | 2007-07-03 | 2014-01-07 | Pioneer Surgical Technology, Inc. | Bone plate system |
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| US4447915A (en) * | 1981-02-18 | 1984-05-15 | Sulzer Brothers Limited | Expandable medullary canal plug |
| US4776330A (en) * | 1986-06-23 | 1988-10-11 | Pfizer Hospital Products Group, Inc. | Modular femoral fixation system |
| US5935169A (en) * | 1997-02-13 | 1999-08-10 | Chan; Kwan-Ho | Bone cement plug for deployment in a bone canal |
| CN102098969A (en) * | 2008-07-17 | 2011-06-15 | 史密夫和内修有限公司 | Surgical devices |
| CN202920414U (en) * | 2012-12-05 | 2013-05-08 | 嘉思特华剑医疗器材(天津)有限公司 | Central mounting device |
| CN106063715A (en) * | 2015-04-22 | 2016-11-02 | 德普伊新特斯产品公司 | Biceps brachii m. prosthetic device |
| CN211911782U (en) * | 2020-03-13 | 2020-11-13 | 山东大学齐鲁医院(青岛) | Distal end plug for femoral stem fixation |
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| CN111281522A (en) | 2020-06-16 |
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