CN215535341U - Flexible intramedullary directional rod for total knee joint - Google Patents
Flexible intramedullary directional rod for total knee joint Download PDFInfo
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- CN215535341U CN215535341U CN202022699050.7U CN202022699050U CN215535341U CN 215535341 U CN215535341 U CN 215535341U CN 202022699050 U CN202022699050 U CN 202022699050U CN 215535341 U CN215535341 U CN 215535341U
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Abstract
The utility model discloses a flexible intramedullary orientation rod for a total knee joint, which comprises an orientation rod and a handle arranged at the end part of the orientation rod, wherein the axis of the handle is vertical to the axis of the orientation rod, the middle part of the orientation rod is a flexible section, and the flexible section can be deformed into a shape matched with the anterior arch of a femoral medullary cavity. The flexible intramedullary orientation rod for the total knee joint provided by the utility model can assist a doctor to determine a proper osteotomy surface and a prosthesis installation position, improve the postoperative life quality of a patient, and reduce complications risks such as anterior condylar pain and a smaller motion range caused by selecting an overlarge prosthesis.
Description
Technical Field
The utility model relates to the technical field of medical instruments for knee joint replacement surgery, in particular to a flexible intramedullary directional rod for a total knee joint.
Background
The artificial knee joint replacement is a new technology for treating knee joint diseases, which is gradually developed after the modern artificial hip joint is successfully applied to patients, can effectively eradicate late-stage knee joint pain, greatly improves the life quality of the patients, and is popular in developed countries. Factors affecting the efficacy of total knee arthroplasty (TKR) include: firstly, dissecting a force line; processing the internal and external turns of the knee joint; whether the proximal tibia is defective or not; among them, the force line in total knee replacement is very critical, for example, when the distal femur osteotomy is performed, the contact surface of the articular surface needs to be changed by changing the force line, and then the prosthesis is correctly placed according to the force line, if the position or the size of the prosthesis is not proper, pain, limited joint movement, looseness, abrasion and joint instability are caused, and therefore, the service life of Total Knee Replacement (TKR) depends on whether the force line is proper or not after the operation.
Referring to fig. 1, the currently existing femoral intramedullary locating rod mainly comprises a handle 2 and a rigid orientation rod 1, the handle 1 is provided with a button 3 for connecting the rigid orientation rod 2, when in use, the button 3 needs to be pressed to the bottom first, then the rigid orientation rod 1 is aligned with a mounting hole on the handle 2 and inserted to the bottom, the axis of the rigid orientation rod 1 is ensured to be perpendicular to the axis of the handle 2, and finally the button 3 is loosened to complete fixation. This kind of locating lever in femoral bone marrow is the rigidity locating lever, when using, the rigidity locating lever can not warp according to the change of patient's thighbone anterior arch angle, consequently the distal end osteotomy face by its direction design can not be perpendicular to the axis of actual thighbone distal end, the thighbone size that can lead to when measuring like this is greater than the size of actual thighbone, thereby match out the size prosthesis bigger than normal, because the mounted position of prosthesis is leaned on forward, consequently, the distance of postoperative patella and thighbone condyle prosthesis at the anterior condyle can be little than normal, thereby lead to the patient to arouse pain when straightening shank.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides a flexible intramedullary positioning rod for a total knee joint, which can assist a doctor to determine a proper osteotomy surface and a prosthesis installation position, improve the postoperative life quality of a patient, and reduce complications such as anterior condylar pain and a smaller motion range caused by selecting an oversized prosthesis.
In order to achieve the above purpose, the utility model provides the following technical scheme:
the flexible intramedullary orientation rod for the total knee joint comprises an orientation rod and a handle arranged at the end part of the orientation rod, wherein the axis of the handle is perpendicular to the axis of the orientation rod, the middle part of the orientation rod is a flexible section, and the flexible section can be deformed into a shape matched with the anterior arch of a femoral medullary cavity.
As a practical way, the flexible section is flat.
As a practical way, the material of the flexible section is stainless steel or titanium alloy.
As an implementation manner, a first guide section and a second guide section are respectively arranged on two sides of the flexible section, wherein the first guide section and the second guide section are both cylindrical.
As an implementation manner, the first guide section and/or the second guide section is provided with a groove for clearing the marrow.
As an implementable manner, the groove is an annular groove formed around the circumference of the first guide section or the second guide section.
As an implementation manner, a plurality of annular grooves are formed on each of the first guide section and the second guide section.
As an implementable manner, the ends of the flexible orienting rod are welded to the handle.
As an implementation manner, a threaded hole is formed in the middle of the handle, an external thread is formed at one end of the orientation rod, and the orientation rod is detachably mounted in the threaded hole of the handle through the external thread.
Compared with the prior art, the utility model has the following beneficial effects:
the flexible section is arranged in the middle of the flexible intramedullary directional rod of the total knee joint, and can deform along with the change of the anterior arch of the femoral medullary cavity of a patient, so that the flexible intramedullary directional rod meets the clinical requirements, can obtain an accurate femoral distal osteotomy surface and prosthesis installation position relative to the existing rigid directional rod, can further help measure and measure a proper size of the femoral prosthesis, reduces the risk of complications such as anterior condylar pain and a smaller motion range caused by selecting an overlarge prosthesis, and improves the postoperative life quality of the patient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a rigid guide bar according to the prior art;
FIG. 2 is a schematic view of a flexible intramedullary orienting rod for a total knee joint according to an embodiment of the present invention.
Description of reference numerals:
1. an orientation bar; 11. a flexible section; 12. a first guide section; 13. a second guide section; 14. a groove; 2. a handle; 3. a button.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 2, the present invention provides a flexible intramedullary directional rod for a total knee joint, including a directional rod 1 and a handle 2 disposed at an end of the directional rod 1, wherein an axis of the handle 2 is perpendicular to an axis of the directional rod 1, a middle portion of the directional rod 1 is a flexible segment 11, and the flexible segment 11 can be deformed along with bending of an anterior arch of a femoral medullary cavity to be deformed into a shape adapted to the anterior arch of the femoral medullary cavity.
The middle part of the flexible intramedullary directional rod for the total knee joint is provided with the flexible section 11, and the flexible section 11 can deform along with the change of the anterior arch of the femoral medullary cavity of a patient, so that the flexible intramedullary directional rod meets the clinical requirements, can obtain an accurate femoral distal osteotomy surface and an accurate prosthesis installation position compared with the existing rigid directional rod, can further help measure and measure a proper size of the femoral prosthesis, reduces the risk of complications such as the pain of the anterior condyle, a smaller motion range and the like caused by selecting an overlarge prosthesis, and improves the postoperative life quality of the patient.
In this embodiment, flexible section 11 sets up to the platykurtic, the lateral wall of the flexible section 11 of platykurtic has certain limiting displacement, it is difficult to take place the rotation at the in-process of advancing, and also take place deformation more easily, when squeezing into the femoral medullary cavity, be convenient for along with the change of femoral medullary cavity bow and warp, the material of flexible section 11 can select stainless steel, the metal that titanium alloy etc. has certain mechanical strength, wherein, in this embodiment, only set up flexible section 11 to the platykurtic, and the first guide section 12 and the second guide section 13 that are located flexible section 11 both sides set up to be cylindricly best, be convenient for like this with orientation rod 1 squeeze into in the femoral medullary cavity.
In addition, the first guide section 12 and/or the second guide section 13 are/is provided with a groove 14, the groove 14 can play a role of clearing marrow along with the movement of the orientation rod 1, and the groove 14 is an annular groove formed around the circumference of the first guide section 12 or the second guide section 13 in the embodiment.
In order to achieve a good marrow cleaning effect, a plurality of annular grooves may be formed in the first guide section 12 and the second guide section 13, respectively.
In addition, in the present embodiment, the directional rod 1 is preferably directly welded on the handle 2, for example, argon arc welding, so as to avoid the need of adjusting the installation positions of the directional rod 1 and the handle 2 for multiple times during subsequent installation, thereby facilitating subsequent operation.
During production, the tail end of the orientation rod 1 can be inserted into a hole of the handle 2 to ensure that the orientation rod is inserted to the bottom, then the horizontal plane of the flexible section 11 in the middle of the orientation rod 1 is perpendicular to the axis of the handle 2 to be welded and polished, and finally, sand blasting is carried out on the surface.
Of course, it is also possible to provide a threaded hole (not shown) in the middle of the handle 2, provide an external thread at one end of the orientation rod 1, and detachably mount the orientation rod 1 in the threaded hole of the handle 2 through the external thread, thereby simplifying the mounting operation to some extent.
When the device is used, the flexible intramedullary orientation rod passes through a through hole in the middle of the femur force line guider, the front end of the flexible intramedullary orientation rod is aligned with the opening marrow of the femur, the flexible intramedullary orientation rod and the femur force line guider are close to the distal end of the femur together and are fixed by bone nails, and the eversion angle on the femur force line guider is adjusted according to the actual condition of the distal end of the femur of a patient through the matching of the flexible intramedullary orientation rod of the total knee joint and the femur force line guider so as to assist in determining the eversion angle of the femur; then fixing the distal osteotomy plate on the femur, performing distal osteotomy by using a blade, then measuring the size of the femur by using a femur measurer, performing 4-in-1 osteotomy before prosthesis positioning, and positioning and mounting the femoral prosthesis on the osteotomy surface.
This application is in the use, because flexible section 11 of orienting rod 1 has the function of warping, so can help finding the thighbone axis that is closest, realizes accurate osteotomy to guarantee the size and the location accuracy of prosthesis.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The flexible intramedullary orientation rod for the total knee joint is characterized by comprising an orientation rod and a handle arranged at the end part of the orientation rod, wherein the axis of the handle is perpendicular to that of the orientation rod, the middle part of the orientation rod is a flexible section, and the flexible section can be deformed into a shape matched with the anterior arch of a femoral medullary cavity.
2. The flexible intramedullary orienting rod of claim 1 wherein the flexible segment is flat.
3. The flexible intramedullary directional rod of claim 2, wherein the flexible segments are made of stainless steel or titanium alloy.
4. The flexible intramedullary rod of any one of claims 1-3, wherein the flexible segment is flanked by a first guide segment and a second guide segment, wherein the first guide segment and the second guide segment are each cylindrical.
5. The flexible intramedullary guiding rod of claim 4, wherein the first guiding segment and/or the second guiding segment defines a groove for clearing the medulla.
6. The flexible intramedullary orienting rod of claim 5 wherein the groove is an annular groove formed around the circumference of the first or second guide segments.
7. The flexible intramedullary directional rod of claim 6, wherein the first guide segment and the second guide segment each define a plurality of annular grooves therein.
8. The flexible intramedullary orienting rod of any one of claims 1-3 and 5-7, wherein an end of the orienting rod is welded to the handle.
9. The flexible intramedullary orienting rod of any one of claims 1 to 3 and 5 to 7, wherein the handle has a threaded bore formed in a middle portion thereof, and wherein the orienting rod has an external thread formed at one end thereof, and wherein the orienting rod is detachably mounted in the threaded bore of the handle via the external thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022699050.7U CN215535341U (en) | 2020-11-20 | 2020-11-20 | Flexible intramedullary directional rod for total knee joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022699050.7U CN215535341U (en) | 2020-11-20 | 2020-11-20 | Flexible intramedullary directional rod for total knee joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215535341U true CN215535341U (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022699050.7U Active CN215535341U (en) | 2020-11-20 | 2020-11-20 | Flexible intramedullary directional rod for total knee joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215535341U (en) |
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- 2020-11-20 CN CN202022699050.7U patent/CN215535341U/en active Active
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