CN213208870U - Measuring tool for artificial total knee joint replacement - Google Patents
Measuring tool for artificial total knee joint replacement Download PDFInfo
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- CN213208870U CN213208870U CN202021715623.4U CN202021715623U CN213208870U CN 213208870 U CN213208870 U CN 213208870U CN 202021715623 U CN202021715623 U CN 202021715623U CN 213208870 U CN213208870 U CN 213208870U
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Abstract
The utility model discloses a measuring tool for artifical total knee joint replacement art, include: the first end of the main ruler is provided with a first inner measuring claw and a second inner measuring claw which are symmetrical with the main ruler; and the vernier is slidably attached to the main scale, one end, close to the first end of the main scale, of the vernier is provided with a third inner measuring claw and a fourth inner measuring claw which are symmetrical relative to the vernier, the lengths of the first inner measuring claw and the second inner measuring claw are larger than those of the third inner measuring claw and the fourth inner measuring claw, the vertical distance between the plane, perpendicular to the main scale, of the side edges, contacting the part to be measured, of the first inner measuring claw and the second inner measuring claw is D1, the vertical distance between the plane, perpendicular to the vernier, of the side edges, contacting the part to be measured, of the third inner measuring claw and the fourth inner measuring claw and the zero scale line of the vernier is D2, and D1 is equal to D2. The utility model discloses can be in knee joint intracavity accuracy and measure the projection distance of patella/patellar ligament and shin thigh contact point on sagittal position under the different angle of bending knee conveniently.
Description
Technical Field
The utility model relates to a medical measuring tool technical field, concretely relates to a measuring tool for artifical total knee joint replacement art.
Background
The knee joint is an important weight bearing joint of the human body. Articular cartilage wears and degrades with age, resulting in osteoarthritis. The knee osteoarthritis is a common disease of the elderly, and the incidence rate of symptomatic knee osteoarthritis in China is 8.1 percent at present. With the advent of an aging society, more and more patients with severe knee osteoarthritis need to undergo artificial total knee replacement therapy.
In the artificial total knee joint replacement, kinematics alignment restores the shin-thigh contact point by accurately reconstructing the original knee joint anatomical structure and motion trail of a patient, and realizes the normal backward rolling of thighbone, thereby reducing the discomfort of the patient after operation and realizing 'forgetting knee'. Therefore, measurement of the original tibiofemoral contact point position is crucial.
When the artificial total knee joint replacement is carried out, the sagittal projection distance between the patella/patellar ligament and the original tibiofemoral contact point at different knee bending angles needs to be measured in the knee joint cavity. The two inner measuring claws are supported in an object to be measured by using the existing vernier caliper, so that the inner diameter of the object can be measured. However, the existing vernier caliper has the following defects: 1. the inner measuring jaw is too short to measure the inner diameter of deep tissue (joint cavity); 2. the length between the two inner measuring claws is consistent, and the projection distance between two tissues at different depths cannot be measured; 3. single-sided readings limit the flexibility of measurements in body cavities. Therefore, the existing vernier caliper can only measure the distance between shallow tissues with the same depth, but the measurement of the projection distance between tissues with different depths in a body cavity is difficult to realize.
In view of the above problems in the prior art, there is a need in the art for a vernier caliper capable of measuring the sagittal plane projection distance between the patella/patellar ligament and the original tibiofemoral contact point at different knee flexion angles in the knee joint cavity when performing artificial total knee replacement.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a measuring tool for artificial total knee replacement, which can solve the problem that the prior art cannot measure the sagittal projection distance between the patella/patellar ligament and the original tibiofemoral contact point at different knee flexion angles in the knee joint cavity when performing total knee replacement.
In accordance with the above purpose, an aspect of the embodiments of the present invention provides a measuring tool for artificial total knee replacement, including:
the first end of the main ruler is provided with a first inner measuring claw and a second inner measuring claw which are symmetrical about the main ruler, and the main ruler, the first inner measuring claw and the second inner measuring claw form a first T-shaped structure; and
the vernier is slidably attached to the main scale, one end, close to the first end of the main scale, of the vernier is provided with a third inner measuring claw and a fourth inner measuring claw which are symmetrical to the vernier, the third inner measuring claw and the fourth inner measuring claw form a second T-shaped structure,
the length of the first inner measuring claw or the second inner measuring claw is greater than that of the third inner measuring claw or the fourth inner measuring claw, the vertical distance between the plane perpendicular to the main scale and the zero graduation line of the main scale, where the side edges of the first inner measuring claw and the second inner measuring claw in contact with the part to be measured are located, is D1, the vertical distance between the plane perpendicular to the vernier, where the side edges of the third inner measuring claw and the fourth inner measuring claw in contact with the part to be measured are located, and the zero graduation line of the vernier is D2, and D1 is equal to D2.
In the above measuring tool for artificial total knee replacement, preferably, the lengths of the first inner measuring jaw and the second inner measuring jaw are both 40mm, and the lengths of the third inner measuring jaw and the fourth inner measuring jaw are both 15 mm.
In the above measuring tool for artificial total knee replacement, preferably, the front and back of the main ruler and the front and back of the vernier are provided with corresponding scales.
In the above measuring tool for artificial total knee replacement, preferably, the first inner measuring jaw, the second inner measuring jaw, the third inner measuring jaw and the fourth inner measuring jaw are all made of stainless steel.
Preferably, the first inner measuring claw and the second inner measuring claw are integrally formed with the main scale, and the third inner measuring claw and the fourth inner measuring claw are integrally formed with the vernier.
In the above measuring tool for artificial total knee replacement, preferably, the vernier is provided with a depth scale extending towards the second end of the main scale.
Advantageous effects
The utility model provides a measuring tool for artifical total knee replacement art can be in the knee joint intracavity accuracy and measure the different projection distance of patella/patellar ligament and shin thigh contact point on the sagittal position under the angle of bending knee conveniently. The distance is an important parameter for restoring the original tibiofemoral contact point after the artificial total knee replacement and realizing the kinematics alignment. Meanwhile, important data are provided for the deep research of the influence of the kinematics on the alignment and the recovery of the original anatomy of the knee joint on the long-term treatment effect.
Drawings
Fig. 1 is a schematic view of a measuring tool for artificial total knee replacement according to an embodiment of the present invention.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
It should be noted that all expressions using "first", "second", "third", "fourth", etc. in the embodiments of the present invention are used for distinguishing a plurality of entities with the same name but different names or different parameters, and it can be seen that "first", "second", "third", "fourth", etc. are only for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe this one by one.
In view of the above, the embodiment of the present invention provides an embodiment of a measuring tool for artificial total knee replacement. The measuring tool belongs to a novel vernier caliper. When the artificial total knee joint replacement is carried out, the measuring tool can be used for measuring the sagittal position projection distance between the original tibiofemoral contact point and the patella/patellar ligament at different knee bending angles, so that the tibiofemoral contact point which is normally dissected after the artificial total knee joint replacement is recovered, and important reference is provided for the kinematics alignment. Fig. 1 is a schematic view of a measuring tool for artificial total knee arthroplasty of this embodiment. As shown in fig. 1, the measuring tool for artificial total knee arthroplasty mainly comprises a main scale 1, a vernier 4 and two pairs of inner measuring claws 2, 5 and 3, 6 with different lengths which are respectively arranged at two sides of the main scale 1 and the vernier 4.
The first end of the main ruler 1 is provided with a first inner measuring claw 2 and a second inner measuring claw 3 which are symmetrical relative to the main ruler 1, and the main ruler 1, the first inner measuring claw 2 and the second inner measuring claw 3 form a first T-shaped structure. The vernier 4 is slidably attached to the main scale 1, a third inner measuring claw 5 and a fourth inner measuring claw 6 which are symmetrical with respect to the vernier 4 are arranged at one end of the vernier 4 close to the first end of the main scale 1, and the vernier 4, the third inner measuring claw 5 and the fourth inner measuring claw 6 form a second T-shaped structure. The length of the first inner measuring jaw 2 or the second inner measuring jaw 3 is greater than the length of the third inner measuring jaw 5 or the fourth inner measuring jaw 6. The vertical distance between the plane perpendicular to the main scale 1 and the zero scale line of the main scale 1 where the side edges of the first inner measuring claw 2 and the second inner measuring claw 3 contacting the parts to be measured (i.e. the left side edges of the first inner measuring claw 2 and the second inner measuring claw 3 in the figure) are located is D1, and D1 is the shortest horizontal distance in the main scale extending direction between the left side edges of the first inner measuring claw 2 and the second inner measuring claw 3 and the zero scale line of the main scale 1. The vertical distance between the plane perpendicular to the cursor and the zero scale line of the cursor 4 where the side edges of the third inner measuring claw 5 and the fourth inner measuring claw 6 contacting the part to be measured (i.e. the right side edges of the third inner measuring claw 5 and the fourth inner measuring claw 6 in the figure) are located is D2, and D2 is the shortest horizontal distance in the cursor extending direction between the right side edges of the third inner measuring claw 5 and the fourth inner measuring claw 6 and the zero scale line of the cursor 4. Preferably D1 equals D2 so that main scale 1 is aligned with the zero scale line of cursor 4 when the inner measuring jaws are closed.
Because the first inner measuring claw 2 and the second inner measuring claw 3 are symmetrically arranged and the third inner measuring claw 5 and the fourth inner measuring claw 6 are symmetrically arranged, the size, the shape and the arrangement position of the first inner measuring claw 2 and the second inner measuring claw 3 are the same and the size, the shape and the arrangement position of the third inner measuring claw 5 and the fourth inner measuring claw 6 are the same.
As shown in fig. 1, the first inner measuring jaw 2 and the third inner measuring jaw 5 form a first pair of inner measuring jaws of different lengths, and the second inner measuring jaw 3 and the fourth inner measuring jaw 6 form a second pair of inner measuring jaws of different lengths, the two pairs of inner measuring jaws being symmetrical with respect to the axis of symmetry of the measuring tool.
In a preferred embodiment, the first inner measuring jaw 2 and the second inner measuring jaw 3 are 40mm in length (i.e. over the radius of most of the tibiofemoral platform in chinese), and the third inner measuring jaw 5 and the fourth inner measuring jaw 6 are 15mm in length.
In a preferred embodiment, to facilitate the reading of the left/right knee joint and the operator and assistant standing in different positions, the measuring tool is not only provided with symmetrical inner measuring jaws, but also the front and back of the main scale 1 and the front and back of the cursor 4 are provided with corresponding scales so that both sides can be read.
In a preferred embodiment, the measuring tools are made of stainless steel, so that the measuring tools are convenient to disinfect and recycle
In a preferred embodiment, the first inner measuring jaw 2 and the second inner measuring jaw 3 are formed integrally with the main scale 1, and the third inner measuring jaw 5 and the fourth inner measuring jaw 6 are formed integrally with the vernier 4. However, the inner measuring jaw can also be fixed to the main scale 1 and the vernier 4 by means of a detachable (e.g. screw connection) connection. The cursor 4 can be nested on the main scale 1 by the existing assembly method.
In a preferred embodiment, the cursor 4 is provided with a depth scale 7 extending towards the second end of the main scale 1.
The main scale 1 is in millimeter units, the vernier 4 can be provided with 10, 20 or 50 divisions, different accuracies can be given to the measuring tool according to the division, the scale is 9mm long when the vernier 4 is divided by 10 divisions, 19mm long when the vernier 4 is divided by 20 divisions, and 49mm long when the vernier 4 is divided by 50 divisions.
Before use, the inner measuring jaw is first closed to see if the zero scale lines of the vernier 4 and the main scale 1 are aligned. Measurements can be made if aligned: if there is no alignment, then zero error is recorded: the zero scale line of the vernier 4 is called positive zero error on the right side of the zero scale line of the main scale 1, and is called negative zero error on the left side of the zero scale line of the main scale 1. When the artificial total knee joint replacement is carried out, the anterior cruciate ligament is not resected after the joint capsule in front of the knee joint is cut, the release of the tibial platform is not carried out, when the knee joint is flexed at different angles, the first inner measuring claw 2 or the second inner measuring claw 3 is supported behind the patella/patella ligament, the third inner measuring claw 5 or the fourth inner measuring claw 6 is supported in front of the contact point of the medial tibiofemoral joint, and the reading on the main ruler 1 is the projection distance of the contact point of the patella/patella ligament and the original tibiofemoral joint on the sagittal position. The same is true when the knee prosthesis and spacer are installed.
The utility model discloses a measuring tool comprises the interior measuring claw of a long one short of bilateral symmetry, main scale and vernier, and wherein the length of measuring the claw in the long is located between 1-2 tibial plateau semi-diameter, measures claw length in the short between the inboard condyle width of 0.5-1 thighbone.
For the person skilled in the art, the above numerical limitations should not limit the scope of the present invention, which is only a preferred embodiment of the present invention. Those skilled in the art can make modifications as needed, as long as they can solve the technical problems described above.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A measurement tool for artificial total knee arthroplasty, comprising:
the first end of the main ruler is provided with a first inner measuring claw and a second inner measuring claw which are symmetrical about the main ruler, and the main ruler, the first inner measuring claw and the second inner measuring claw form a first T-shaped structure; and
the vernier is slidably attached to the main scale, one end, close to the first end of the main scale, of the vernier is provided with a third inner measuring claw and a fourth inner measuring claw which are symmetrical to the vernier, the third inner measuring claw and the fourth inner measuring claw form a second T-shaped structure,
the first inner measuring claw and the second inner measuring claw have a first length, the third inner measuring claw and the fourth inner measuring claw have a second length, the first length is greater than the second length, the perpendicular distance between the plane perpendicular to the main scale and the zero graduation line of the main scale, where the side edges of the first inner measuring claw and the second inner measuring claw, which are in contact with the part to be measured, are located, is D1, the perpendicular distance between the plane perpendicular to the vernier, where the side edges of the third inner measuring claw and the fourth inner measuring claw, which are in contact with the part to be measured, are located, and the zero graduation line of the vernier is D2, and D1 is equal to D2.
2. The measurement tool for artificial total knee replacement of claim 1, wherein the first length of the first inner measurement jaw and the second inner measurement jaw is 40mm, and the second length of the third inner measurement jaw and the fourth inner measurement jaw is 15 mm.
3. The measuring tool for artificial total knee replacement according to claim 1, wherein the front and back of the main scale and the front and back of the vernier are provided with corresponding graduations.
4. The measurement tool for artificial total knee replacement of claim 1, wherein the first inner measurement jaw, the second inner measurement jaw, the third inner measurement jaw and the fourth inner measurement jaw are made of stainless steel.
5. The measurement tool for artificial total knee replacement of claim 1, wherein the first and second inner measurement jaws are integrally formed with the main scale, and the third and fourth inner measurement jaws are integrally formed with the cursor.
6. The measurement tool for artificial total knee arthroplasty of claim 1 wherein the vernier is provided with a depth scale extending towards the second end of the main scale.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021715623.4U CN213208870U (en) | 2020-08-17 | 2020-08-17 | Measuring tool for artificial total knee joint replacement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021715623.4U CN213208870U (en) | 2020-08-17 | 2020-08-17 | Measuring tool for artificial total knee joint replacement |
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| CN213208870U true CN213208870U (en) | 2021-05-14 |
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| CN202021715623.4U Active CN213208870U (en) | 2020-08-17 | 2020-08-17 | Measuring tool for artificial total knee joint replacement |
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