CN211911782U - Distal end plug for femoral stem fixation - Google Patents
Distal end plug for femoral stem fixation Download PDFInfo
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- CN211911782U CN211911782U CN202020315227.6U CN202020315227U CN211911782U CN 211911782 U CN211911782 U CN 211911782U CN 202020315227 U CN202020315227 U CN 202020315227U CN 211911782 U CN211911782 U CN 211911782U
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Abstract
The utility model provides a distal end plug for femoral stem fixation, which comprises a plug sleeve, a plug shaft, a pushing structure and a pressing structure; the plug sleeve is pushed into the medullary cavity by using the pushing structure and is stopped to a proper position after crossing the isthmus, then the plug shaft is plugged into the hollow inner cavity of the pushing structure, the pressing structure penetrates through the hollow inner cavity of the pushing structure to apply force to the plug shaft, the plug shaft is pushed to be inserted into the plug sleeve, the inner wall of the plug sleeve is extruded, the plug sleeve is expanded, and the plug sleeve is further extruded and fixed in the medullary cavity; the plug shaft and the plug sleeve form separation together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microscopic interlocking is formed between the bone cement and the loose bone of the femur, so that the femoral stem is firmly fixed; the utility model discloses a distal end stopper can enough pass gorges, can firmly be fixed in medullary cavity inside again, forms reliable separation, and the convenience can improve the operation effect to the bone cement application of force.
Description
Technical Field
The utility model relates to a bone cement type femoral stem is fixed with appurtenance technical field, concretely relates to distal end stopper is used to femoral stem is fixed.
Background
With the aging of the modern society, the femoral neck fracture of the old people is more and more. Hip replacement is the first treatment to alleviate the pain and improve the quality of life of the patient. Among the elderly, a considerable proportion of patients require the use of bone cement type femoral stems. The bone cement type femoral stem is loaded in the process that a distal end plug is firstly placed in a femoral bone marrow cavity (about 2cm away from the distal end of the femoral stem), then the bone cement in a dough shape is injected into the femoral bone marrow cavity, and the femoral stem is placed after proper pressurization, so that firm fixation is achieved, and long-term use of the femoral stem is guaranteed.
The distal plug has the effects that a barrier is formed inside the femoral medullary cavity, when bone cement is injected into the femoral medullary cavity, the bone cement is prevented from flowing to the distal end inside the femoral medullary cavity, the bone marrow at the distal end inside the femoral medullary cavity is prevented from being damaged, and the using amount of the bone cement can be reduced; more importantly, after the bone cement is driven in, the bone cement needs to be properly pressurized, so that sufficient microscopic interlocking is formed between the bone cement and loose bone of the femur, and the aims of firmly fixing the femoral stem and ensuring long-term use of the femoral stem are fulfilled; if no distal end plug is arranged, good pressurization cannot be achieved, so that bone cement and loose bone of the femur cannot be well interlocked, further the femur is not firmly fixed and is easy to loosen, and the service time is influenced.
The femoral medullary cavity is characterized in that about 1/3 of the proximal end of the femoral medullary cavity is provided with an isthmus, the medullary cavity at the position of the isthmus is narrow, the medullary cavity at the front part and the back part of the isthmus are wide, the distal end of the femoral stem is required to reach the isthmus to be far in order to achieve effective fixation, and similarly, the distal plug is also required to be placed to the isthmus to be far.
At present often run into the distal end stopper and can not firmly fix after putting into, can not effectively block bone cement, influence bone cement's pressurization, finally influence the fastness that the femoral stem is fixed, when changing with the large-size distal end stopper, can not pass through the thighbone isthmus again, can't put into.
For example, chinese patent document CN2657611Y discloses an artificial hip joint bone cement distal embolus, which comprises a central shaft column and ring pieces, wherein the diameter of the ring pieces is arranged on the central shaft column in a tapered manner from large to small; for example, chinese patent document CN202161390U discloses a femoral medullary cavity embolus, which comprises a guide cone, a central hole, a fixing protrusion and an open slot, wherein the guide cone is divided into an inner medullary cavity flap and an outer medullary cavity flap; the center of the femoral medullary cavity embolus is provided with a center hole which forms a thin wall with the guide cone, and the upper end of the guide cone is provided with an open slot. The above prior art does not solve the above technical problem well, i.e. due to the position of the isthmus, the distal plug that can pass through the isthmus cannot be fixed firmly inside the medullary cavity, and the distal plug that can be fixed firmly cannot pass through the isthmus.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the unable while of distal end stopper among the prior art and satisfying, can enough pass isthmus, can firmly fixed technical defect in pulp cavity inside again to a distal end stopper is used in femoral stem fixation that can realize above-mentioned purpose is provided.
Therefore, the utility model provides a distal end stopper is used in femoral stem is fixed, include:
the plug sleeve is hollow and is suitable for being installed into the medullary cavity, and the interior of 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 propelling structure is provided with a hollow inner cavity and can be detachably connected with the plug sleeve;
and the pressing structure can penetrate through the hollow inner cavity to apply force to the plug shaft and push the plug shaft to be inserted into the plug sleeve.
Preferably, the sleeve comprises:
a cylindrical main body;
the first connecting structure is arranged at one end of the cylindrical main body and is detachably connected with the propelling 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 lobes.
Preferably, the cylindrical body has a uniform outer diameter and an inner diameter that gradually decreases in the insertion direction.
As a preferred scheme, a plurality of annular elastic sheets are uniformly arranged on the outer wall of the cylindrical main body;
the annular elastic sheet is also cut off by the longitudinal cut at the part provided with the longitudinal cut;
at least one circle of annular elastic sheets are arranged at the part which is not provided with the longitudinal notch.
Preferably, the annular elastic sheet is provided with two circles at a part where the longitudinal cut 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 matched with the internal thread in a threaded manner.
As a preferable mode, the plug shaft includes:
a plug shaft body insertable into the plug housing; the plug shaft body has an outer diameter greater than an inner diameter of the cylindrical body.
As a preferable scheme, the anti-dropping structure further comprises:
the anti-falling groove is formed in the inner wall of the cylindrical main body;
and the anti-falling snap ring is arranged on the outer wall of the plug shaft.
Preferably, the plug shaft body is cylindrical or conical.
Preferably, the pressing structure comprises a pressing shaft, and the pressing shaft can penetrate through the hollow inner cavity of the propelling structure to apply force to the plug shaft.
The technical scheme provided by the utility model, following advantage has:
1. the utility model discloses a distal end plug for femoral stem fixation, which comprises a plug sleeve, a plug shaft, a pushing structure and a pressing structure; the plug sleeve is pushed into the medullary cavity by using the pushing structure and is stopped to a proper position after crossing the isthmus, then the plug shaft is plugged into the hollow inner cavity of the pushing structure, the pressing structure penetrates through the hollow inner 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 to expand the plug sleeve, so that the plug sleeve is extruded and fixed in the medullary cavity; the plug shaft and the plug sleeve form separation together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microscopic interlocking is formed between the bone cement and the loose bone of the femur, so that the femoral stem is firmly fixed; the utility model discloses a distal end stopper can enough pass gorges, can firmly be fixed in medullary cavity inside again, forms reliable separation, and the convenience can improve the operation effect to the bone cement application of force.
2. The utility model discloses a far-end plug, the cock sleeve includes the tube-shape main part, the first connecting structure sets up in one end of the tube-shape main part, is used for connecting with pushing the structure to dismantle, at least two longitudinal cuts set up in the other end of the tube-shape main part, and extend certain length, divide into at least two lamellas with the corresponding part of tube-shape main part; when the plug shaft is inserted into the cylindrical main body, the inner wall of the cylindrical main body is pressed, the cylindrical main body with at least two lobes expands to the periphery, and therefore the plug shaft is pressed and fixed on the inner wall of the medullary cavity to form firm fixation.
3. The far-end plug of the utility model has the advantages that the outer diameter of the cylindrical main body is uniform and consistent, and the inner diameter is gradually reduced along the insertion direction; the outer diameter is uniform, so that the clearance between the outer wall of the plug sleeve and the inner wall of the medullary cavity can be always kept in a smaller range, and effective separation is facilitated; the internal diameter reduces along inserting the direction gradually, makes things convenient for the stopper axle to insert the time and fills in the axle interact, outside inflation, and after the internal diameter reduces gradually in addition, the front end of tube-shape main part progressively seals, forms a blunt end, can reduce the injury to the marrow.
4. The far-end plug of the utility model is characterized in that a plurality of annular elastic pieces are evenly arranged on the outer wall of the cylindrical main body, and the annular elastic pieces have the functions of assisting in fixation and forming separation; the annular elastic sheet is provided with at least one circle of complete annular elastic sheet which is not cut off by the longitudinal cuts, so that the separation can be better formed, and the bone cement leakage can be prevented (as the bone cement is in a dough shape, although small gaps exist between the periphery of the annular elastic sheet which is not cut off by the longitudinal cuts and the inner wall of the medullary cavity, the annular elastic sheet can effectively block the bone cement, and even if the annular elastic sheet is subjected to layer-by-layer auxiliary separation of a plurality of annular elastic sheets which are cut off by the longitudinal cuts in the subsequent process).
5. The utility model discloses a distal end stopper, impel structure and cock cover to pass through helicitic texture cooperation spiro union, combine when impelling, and the reversal withdraws from after fixing.
6. The utility model discloses a distal end stopper still includes anti-disengaging structure, specifically is the anticreep groove that sets up on the tube-shape main part inner wall with set up the epaxial anti-disengaging snap ring of stopper, anti-disengaging structure's setting can prevent to fill in the roll-off of axle under pressure to can guarantee firmly fixedly.
Drawings
In order to more clearly illustrate the technical solutions in the prior art or the embodiments of the present invention, the drawings used in the description of the prior art or the embodiments are briefly introduced below.
Fig. 1 is a schematic view of the overall structure of a distal end plug for femoral stem fixation in embodiment 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 the distal plug for 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 connecting structure; 13. a longitudinal cut; 14. an annular spring plate; 15. a drop-proof groove; 2. a plug shaft; 20. a plug shaft body; 21. an anti-drop snap ring; 22. a flange; 3. a propulsion structure; 31. a hollow interior cavity; 4. a pressing structure; 41. the shaft is pressed.
Detailed Description
The following describes the technical solution of the present invention in detail.
Example 1
The present embodiment provides a distal plug for femoral stem fixation, as shown in fig. 1 to 2, including: the plug sleeve 1 is hollow and is suitable for being installed into the medullary cavity, and the interior of one end of the plug sleeve can expand after being extruded; a plug shaft 2 which can be inserted into the plug sleeve 1 and is pressed to expand one end of the plug sleeve 1; a pushing structure 3 having a hollow inner cavity 31 detachably connectable with the sleeve 1 for pushing the sleeve 1 into the medullary cavity; and the pressing structure 4 can penetrate through the hollow inner cavity 31 to apply force to the plug shaft 2 and push the plug shaft 2 to be inserted into the plug sleeve 1.
When the distal end plug for femoral stem fixation is used, firstly, the pushing structure 3 is combined with the plug sleeve 1, the plug sleeve 1 is pushed into a medullary cavity and stops to a proper position after crossing an isthmus, then, the plug shaft 2 is plugged into the hollow inner cavity 31 of the pushing structure 3, the pressing structure 4 penetrates through the hollow inner 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 squeezed, so that one end of the plug sleeve 1 is expanded and fixed in the medullary cavity in a squeezing mode; the plug shaft 2 and the plug sleeve 1 form separation together, so that sufficient blocking force can be provided for the dough-shaped bone cement, the bone cement is conveniently pressurized, and sufficient microscopic interlocking is formed between the bone cement and loose bone of the femur, so that a femoral stem is firmly fixed; the distal end plug of this embodiment can enough pass isthmus, can firmly be fixed in medullary cavity inside again, forms reliable separation, conveniently to bone cement application of force, can improve the operation effect.
As shown in fig. 3, the sleeve 1 comprises: a cylindrical main body 11; a first connecting structure 12, arranged at one end of the cylindrical main body 11, for detachably connecting with the propelling structure 3; longitudinal slits 13, 4 in number, are provided on the other end of the cylindrical body 11 and extend a certain length to divide the corresponding portion of the cylindrical body 11 into 4 pieces. When the plug shaft 2 is inserted into the cylindrical body 11, the inner wall of the cylindrical body 11 is pressed, the 4-piece cylindrical body 11 expands to the periphery, and is pressed and fixed on the inner wall of the medullary cavity, so that firm fixation is formed.
The cylindrical body 11 has a uniform outer diameter and an inner diameter that gradually decreases in the insertion direction. The outer diameter is uniform, the clearance between the outer wall of the plug sleeve 1 and the inner wall of the medullary cavity can be always kept in a smaller range, and effective separation is facilitated; the internal diameter reduces along inserting the direction gradually, makes things convenient for stopper axle 2 to insert the time with stopper axle 2 interact, outside inflation, and in addition the internal diameter reduces the back gradually, and the front end of tube-shape main part 11 progressively seals, forms a blunt end, can reduce the injury to the marrow.
A plurality of annular elastic sheets 14 are uniformly arranged on the outer wall of the cylindrical main body 11; at the part where the longitudinal cut 13 is arranged, the annular elastic sheet 14 is also cut off by the longitudinal cut 13; the annular elastic sheet 14 is provided with at least one turn at the part where the longitudinal cut 13 is not provided. The annular elastic sheet 14 has the functions of assisting in fixing and forming separation; the annular elastic sheet 14 is provided with at least one circle of complete annular elastic sheet 14 which is not cut off by the longitudinal cuts, so that the separation can be better formed, and the bone cement leakage can be prevented (as the bone cement is in a dough shape, the annular elastic sheet 14 which is not cut off by the longitudinal cuts 13 has a small gap between the periphery and the inner wall of the medullary cavity, but can effectively block the bone cement, and in any case, a plurality of annular elastic sheets 14 which are cut off by the longitudinal cuts 13 are subjected to layer-by-layer auxiliary separation).
In this embodiment, the annular elastic sheet 14 has two circles at the portion where the longitudinal slit 13 is not provided.
As shown in fig. 2, one end of the hollow inner cavity 31 of the propelling structure 3 is provided with an internal thread; the first connecting structure 12 is an external thread arranged on the outer wall of one end of the cylindrical main body 11, and the external thread can be matched with the internal thread to be screwed. The device is combined during pushing and is reversely rotated and withdrawn after being fixed.
As shown in fig. 5, the plug shaft 2 includes: a plug shaft body 20 insertable into the plug sleeve 1; the plug shaft 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-dropping structure further includes: a drop-off prevention groove 15 provided on an inner wall of the cylindrical body 11; and the anti-falling snap ring 21 is arranged on the outer wall of the plug shaft 2. The setting of anti-disengaging structure can prevent that stopper axle 2 roll-off cock cover 1 under pressure to can guarantee firmly fixedly.
In this embodiment, the plug shaft body 20 is cylindrical.
The pressing structure 4 comprises a pressing shaft 41, and the pressing shaft 41 can penetrate through the hollow inner cavity 31 of the propelling structure 3 to apply force to the plug shaft 2.
The method of use of the distal plug in this embodiment is as follows:
combining the propelling structure 3 with the plug sleeve 1 through threads, and propelling the plug sleeve 1 into the medullary cavity by holding the propelling structure 3 with hands, and stopping 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, force is applied 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 when the plug is inserted, the pushing structure 3 can be held by hand to move the plug sleeve 1 up and down and adjust to other positions, and then the pressing structure 4 is used for pressing the plug shaft 2 until the plug shaft 2 extrudes the plug sleeve 1 to be firmly fixed in the medullary cavity, and the anti-falling clamp 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 sleeve 1; after the fixation is finished, the pressing structure 4 is pulled out, the pushing structure 3 is reversely rotated, the pushing structure 3 and the plug sleeve 1 are disconnected in a threaded mode, and the pushing structure 3 is pulled out.
Example 2
This embodiment provides a distal end plug for femoral stem fixation, which is an improvement over embodiment 1, and is different from embodiment 1 in that a plug shaft main body 20 of a plug shaft 2 has a conical shape, and the conical outer diameter is larger than the inner diameter of a plug sleeve 1 at a corresponding position by a certain set amount, as shown in fig. 6 and 7. When conical stopper axle 2 inserted to 1 inside of cock casing completely, the block is all accomplished to a plurality of anti-disengaging structure, and the anticreep ability is stronger.
In addition, the end of the plug shaft 2 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 should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A distal end plug for femoral stem fixation is characterized in that: the method comprises the following steps:
the plug sleeve (1) is hollow and is suitable for being installed into the medullary cavity, and one end of the plug sleeve can expand after being squeezed;
the plug shaft (2) can be inserted into the plug sleeve (1) and is extruded to expand the plug sleeve (1);
the propelling structure (3) is provided with a hollow inner cavity (31) and can be detachably connected with the plug sleeve (1);
the pressing structure (4) can penetrate through the hollow inner cavity (31) to apply force to the plug shaft (2) and push the plug shaft (2) to be inserted into the plug sleeve (1).
2. The distal plug of claim 1, wherein: the sleeve (1) comprises:
a cylindrical main body (11);
the first connecting structure (12) is arranged at one end of the cylindrical main body (11) and is detachably connected with the propelling structure (3);
at least two longitudinal slits (13) are provided on the other end of the cylindrical body (11) and extend a length to divide the corresponding portion of the cylindrical body (11) into at least two lobes.
3. The distal plug of claim 2, wherein: the outer diameter of the cylindrical main body (11) is uniform, and the inner diameter of the cylindrical main body is gradually reduced along the insertion direction.
4. The distal plug of claim 2, wherein: a plurality of annular elastic sheets (14) are uniformly arranged on the outer wall of the cylindrical main body (11);
the annular elastic sheet (14) is also cut off by the longitudinal cut (13) at the part provided with the longitudinal cut (13);
at the part where the longitudinal cut (13) is not arranged, the annular elastic sheet (14) is provided with at least one circle.
5. The distal plug of claim 4, wherein: the annular elastic sheet (14) is provided with two circles at the part which is not provided with the longitudinal notch (13).
6. The distal plug of claim 2, wherein: one end of a hollow inner cavity (31) of the propelling structure (3) is provided with an internal thread;
the first connecting structure (12) is an external thread arranged on the outer wall of one end of the cylindrical main body (11), and the external thread can be matched with the internal thread to be in threaded connection.
7. The distal plug of claim 2, wherein: the plug shaft (2) includes:
a plug shaft main body (20) that can be inserted into the plug sleeve (1); the plug shaft main body (20) has an outer diameter larger than an inner diameter of the cylindrical main body (11).
8. The distal plug of claim 7, wherein: the plug shaft body (20) is cylindrical or conical.
9. The distal plug of claim 2, wherein: still include anti-disengaging structure, include:
a drop-proof groove (15) which is provided on the inner wall of the cylindrical main body (11);
and the anti-dropping snap ring (21) is arranged on the outer wall of the plug shaft (2).
10. The distal plug of claim 1, wherein: the pressing structure (4) comprises a pressing shaft (41), and the pressing shaft (41) can penetrate through the hollow inner cavity (31) of the propelling structure (3) to apply force to the plug shaft (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020315227.6U CN211911782U (en) | 2020-03-13 | 2020-03-13 | Distal end plug for femoral stem fixation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020315227.6U CN211911782U (en) | 2020-03-13 | 2020-03-13 | Distal end plug for femoral stem fixation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211911782U true CN211911782U (en) | 2020-11-13 |
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ID=73347403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020315227.6U Active CN211911782U (en) | 2020-03-13 | 2020-03-13 | Distal end plug for femoral stem fixation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211911782U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111281522A (en) * | 2020-03-13 | 2020-06-16 | 山东大学齐鲁医院(青岛) | Distal plug assembly for fixing bone cement type femoral stem |
-
2020
- 2020-03-13 CN CN202020315227.6U patent/CN211911782U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111281522A (en) * | 2020-03-13 | 2020-06-16 | 山东大学齐鲁医院(青岛) | Distal plug assembly for fixing bone cement type femoral stem |
| CN111281522B (en) * | 2020-03-13 | 2024-01-02 | 山东大学齐鲁医院(青岛) | Distal plug assembly for fixing bone cement type femoral stem |
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| TR01 | Transfer of patent right |
Effective date of registration: 20221129 Address after: G358, 3rd floor, building 1, yard 9, CHENGWAN street, Haidian District, Beijing 100094 Patentee after: Beijing natong Medical Research Institute Co.,Ltd. Address before: 266035 Hefei Road, Shibei District, Qingdao, Shandong 758 Patentee before: QILU HOSPITAL OF SHANDONG University (QINGDAO) |
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| TR01 | Transfer of patent right |