Source: https://patents.google.com/patent/JP3517413B2/en
Timestamp: 2020-01-18 05:59:14
Document Index: 67381334

Matched Legal Cases: ['art 9', 'art 17', 'art 30', 'art 30', 'art 30', 'art 30', 'art 138', 'art 238', 'art 238']

JP3517413B2 - Apparatus for preparing bone before fixation of joint prosthesis and prosthesis - Google Patents
Apparatus for preparing bone before fixation of joint prosthesis and prosthesis
JP3517413B2
JP3517413B2 JP52013493A JP52013493A JP3517413B2 JP 3517413 B2 JP3517413 B2 JP 3517413B2 JP 52013493 A JP52013493 A JP 52013493A JP 52013493 A JP52013493 A JP 52013493A JP 3517413 B2 JP3517413 B2 JP 3517413B2
JP52013493A
JPH07506745A (en
アブレクトソン，ビヨルン
ヴエンベルイ，ステイーグ
カールソン，ラース
ヤーコプソン，マグヌス
リヨストルンド，トールド
1992-05-18 Priority to SE9201557-7 priority Critical
1992-05-18 Priority to SE9201557A priority patent/SE9201557D0/en
1993-05-14 Application filed by アストラ・アクチエボラーグ filed Critical アストラ・アクチエボラーグ
1995-07-27 Publication of JPH07506745A publication Critical patent/JPH07506745A/ja
2004-04-12 Publication of JP3517413B2 publication Critical patent/JP3517413B2/en
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the articulation of human body joints, in particular, the tibial side of a knee joint.
Joint prosthesis for permanently fixing one of the joints in bone tissue
With regard to a binding device, the prosthesis device has an elongate fix
plate-like element with a ture portion
element). The present invention also provides a method for inserting the prosthesis.
Device for preparing the joint for use. Surgical replacement of the knee joint or other joint joint
The reasons for this and the various methods employed
Patent Application Publication EP-A-0 183 669 (Excellent based on SE 8405989)
It is summarized in the introductory part of the claim on piracy. This sentence
It is also necessary to provide joints for fixation to human joints, especially knee joints.
An example of an improved replacement method and joint prosthesis is disclosed. this
The method adopted in the application is to perform two surgical operations on the subject sequentially.
(So-called two operations). First surgery
In the fixation element is one or both sides of the knee joint, ie
Secured in the tibia (on the shin side) and the femur (femoral side)
And then incorporated into bone tissue (so-called bone incorporation)
Only). Once firmly fixed (about 6 weeks later) a second surgery is performed
The articulation member is fixed by this
Can be firmly attached to This method works clearly, but is completely unloaded
For bone incorporation to occur, the patient must
The disadvantage is that a separate operation must be performed.
In addition, the required osteotomy surgery is rather complicated. The invention relates to a joint prosthesis, the characteristics of which are defined in claim 1.
And prepare the joint for fixation of this prosthesis
Device (the features of this device are defined in claim 16)
Provide a solution to these shortcomings.
Offer. Preferred embodiments of the invention are defined in the dependent claims.
You. The following explanation is especially for the tibial side of the knee joint,
Similar prostheses and their fixation methods are, of course, applicable to other joints.
It should be understood that this can be done. In the case of the joint prosthesis according to the invention, only one major external
Requires only surgery, during which the knee joint is simple
Accurately prepared and then securely secured knee prostheses
Is fitted. So no further surgery needed
Osteointegration and complete healing can occur in The present invention, in one embodiment, comprises a uni-con
dylar) With respect to prostheses, in another embodiment,
Bi-condylar prostheses, but in both cases
The principle of fixing is the same. BRIEF DESCRIPTION OF THE DRAWINGS Principles of the invention, preferred embodiments outside of it and special advantages
Is best described with reference to the accompanying drawings. In the drawings: FIG. 1 shows a typical tibial to which the prosthesis is to be fitted.
Shows the top. Figure 2 shows drilling, sawing and then taking a section of bone
FIG. 2 shows a plan view of the tibia of FIG. 1 after removal. FIG. 3 shows a lateral view of the tibia of FIG. FIG. 4 shows a cutaway view of the section removed in FIGS.
1 shows one embodiment of the device used. FIGS. 5 (a), (b) and (c) show a file on the surface of a bone.
To cut the required spline or serrated path
The following shows the preparation tools that are used. FIG. 6 is about to be inserted into a prepared knee joint
Showing the main part of the prosthesis, with the screw fastener already in the bone
It has been inserted through the bone. FIG. 7 together constitutes a set of prosthetic elements
Screw fixtures, plate-like elements with elongated fixtures, for fixing
Bearing, bearing plate and sliding element
ment). FIG. 8 shows the single head prosthesis in position. FIG. 9 shows a plate-like element before being attached to each other at the processing point
And a view of the elongated cylindrical fixing element viewed from the rear side.
You. FIG. 10 shows a partial cross-sectional view of the single head prosthesis after fixation.
You. FIG. 11 is another embodiment of the present invention relating to a bicapsular prosthesis.
The tibia was removed to show and clarify
The bones are drawn. FIG. 12 shows the keel element before the keel fixture
And illustrates FIG. 11 before the sliding element is applied on the top
Is what you do. FIG. 13 shows the sliding element in place on the keel,
Partially shows the degree of freedom of movement of a moving element. FIG. 14 shows a twin bone prosthesis with only one elongated fastener and
And exploded view of the tibia prepared to receive the prosthesis
Is shown. FIGS. 15, 16 and 17 show a twin bone with two elongated fasteners
Fig. 4 shows two faces of another preferred embodiment of the head prosthesis,
FIG. 16 shows a surface view along the line AA in FIG. FIGS. 18 and 19 are similar to those shown in FIGS.
Two bicapsular prostheses with only one elongate anchor
It is a different illustration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION Prior to performing a fusion surgery, the patient must have already undergone a preoperative x-ray examination and
And the planning stage, during which the requirements for prostheses
Measurements and parameters have been determined. The obtained par
Parameters to prosthetic elements (of course before surgery
Allows for the correct selection of dimensions for
Become. FIG. 1 shows a typical tibia 1 of a human foot to which a prosthesis is fixed.
Is shown. The bone preparation and prosthesis fixing process described later are the same.
It should be understood that all
You. First, the tibia should not be prepared before the prosthesis can be fixed.
I have to. The first step of the operation is from the whole tibia
The first is to penetrate the hole 2. Perforation dimensions are limited
Is somewhat arbitrary, but a hole with a diameter of about 8 mm is full.
I know it's a leg. But elect
The actual hole diameter to be drilled depends on the elongated rigidity of the prosthesis replacement for which drilling is selected.
Must closely correspond to the diameter of the fixed part
No. One particular advantage of the present invention is that good bone incorporation occurs.
As you can see, the hole 2 to be drilled is in the area of healthy bone
is there. With traditional methods, parts of the fixed part are often healthy
Was not part of the bone. The next step in the surgery is the single head quadrant as shown in FIG.
That is, the circular portion 3 is removed. Obtained as a result of removal
The appearance of the bone to be prepared depends on the plane of the tibia prepared in this way and
A side view is shown in FIGS. 2 and 3, respectively. Quadrant 3 can be removed by several methods.
However, for accurate guidance, the surfaces 3 'and 3 "
To ensure that they are at right angles to each other,
It is preferable to use a device that is used. This device is simply
It consists of an L-shaped block of bone, in which the skull quadrant
Saw element (saw elemen) used to cut out position 3
t) Vertical and water acting as true guide surfaces for 7, 8
It has flat slots 5,6. For positioning purposes,
The hook 4 is of course arranged to slide on the guide 9 and
The position is tightened by the fastener 4 '. Open position of lower part
The part 9 'can be secured in the ankle part of the patient's foot
The fastener can also move the pivot axis of the guide rod 9 so that it can be
To Due to the pivot axis and the vertical degree of freedom, the same
The arrangement can be used for different foot widths and sizes. The correct position of the saw tooth in substantially vertical and horizontal directions is
Formed integrally with the L-shaped block and pre-opened in the tibia
In the form of a cylindrical projection 10 that fits well in the hole 2
It is secured by another guiding means. Key to the device in Figure 4
Precise positioning of saw elements is ensured by element combinations
Is done. The cut made by the saw is fairly accurate, but the prosthesis
In order to obtain a smooth surface for securing tools, the surface 3 'and
3 "must first be sanded flat.
This is done using the file 11 shown in FIG.
It is. The file is inserted into the hole 2 already made in the tibia
For its purpose, its elongated cylinder in a guiding element 12
Shaped part is inserted. Splines or serrations described later (serrat
ion) 34, 35, 36 is the most preferred embodiment of the present invention
But they are not essential, and the skeleton
There is no fixation of the prosthesis plate and fixing part by embedding
It should be understood that this is possible. Assuming that splines are used, the next cut and
A preparation process is employed. If the cut surface is smooth enough,
The file 11 is replaced with another file 13 shown in FIG.
This file has a flat underside, but with splines
A cutting or serration cutting rasp element 14 is provided.
For your reference, the spline or serration
It can be called "article" (rifling). Besides, file 13
Is attached to a horizontally extending plate or flange
Splines or serrations 15 are further foreseen. File spline cutting or serrated cutting surface 14
File 15 so that the trailing edge of the file passes across the entire bone surface
Splice with a single file movement across the bone surface
Or serrations are cut to required depth
Have been. To achieve this, under 13 files
The surface is a series of along each of the spline cut surfaces 14 and 15.
It is expected that the cutting element is located. Cutting element
Has a negative angle (that is,
The depth increases along each of the elements 14 and 15. Immediately
The height of the first cutting element at the leading edge of the file is minimal
And the height of the cutting element is the required final spline passage
Increasing toward the trailing edge to a height corresponding to the depth
You. Uses the tubular portion of the file located in the tubular guide 12.
And a single movement of the cutting splines 14 and 15
Until the flat plate-like part of the file presses against the bone surface
A passage is cut through the surface of the damaged bone. After cutting the passage
The guide 13 and the guide 12 are removed from the hole 2. Here another file 16 is inserted into the hole 2 through its tubular part
Inserted. This part 17 for cutting over the file is
13 Same as above, then slowly advance into hole 2
On the other hand, the horizontal and vertical
The straight part is against the cut surfaces 3 'and 3 ".
A horizontal spline passage on the surface of the hole 2
Serrations are created. Fig. 6 Enables insertion of the screw fixing device shown in a predetermined position
In this case, it is necessary to perform a continuous
You. This screw fixture is countersunk from the top of the plate.
That holds the plate-like element of the prosthesis in place
Screw inserted into the horizontal plate-like element of the prosthesis through a hole
With the purpose of providing screw holes for 21. See FIG. 10
Then, you can know this double drilling operation more easily.
Wear. Small enough to receive the lower screw part of the fixing screw 20
A hole of diameter is first drilled. Next, smell the second operation
Large-diameter hole to receive the screw portion 20 ′ of the fixture 20.
An opening is made. In the first drilling operation, the screw fixture 20 is
The soft part of the bone, going all the way through the outer surface
Penetrates both (cancellous bone) and external parts (cortical bone)
This is very important. As you can see, the slopes are usually perforated
Created between the upper 20 'and lower 20 "sections.
Ready to go. Screw fixing devices are usually commercially available pure titanium
This is a self-tapping
Cut through the cortical bone, for example on the thin end of the fixture.
It looks a little sticky out. End 20 of fixture 20
Is rounded and at least the bottom screw exposed
The same applies to This is fixed once
The outside of the bone so that the threaded part of the fixture is visible
Perimeter due to the sharp surface of the screw fastener extending through
Ensure that no tissue is damaged. When the fixture 20 is inserted, the combined elongated fixtures
Plate-like part 30 of the prosthesis with element 31 (before performing this operation
Already manufactured) is countersunk in the plate-like part 30 of the prosthesis
Are inserted so as to engage with the holes of the screw fixing device 20. Then screw
21 can be inserted through the countersink into the screw fastener.
Wear. Then tighten the screws and remove the prosthesis plates / fixtures 30, 31
Hold in place. In addition, here, further holes
Plates without splines or serrations before
Element area or spline or serration
It is open to the holding area. But the most preferred form
Has holes in areas without serrations or splines
Things. One embodiment of the plate-like element (30) and the fixture element (31)
But splines or serrations are present
It will be apparent that non-prosthetic devices are also encompassed by the present invention.
U. In addition, in single head embodiments, the tube-like fixture is required.
Element (31) is directly attached to the plate-like element
Although shown, the two elements 30 and 31 are connected by continuous ribs or
Connected via a row of columns forming a continuous rib (later
As described for the head prosthesis)
You. For example, as can be seen in FIGS.
The upper part is the upper surface of the bone before insertion of the plate 30 and the fixture 31 (ie,
It is substantially flush with the surface 3 '). This same plane relationship
Use the horizontal plane before fixing the plates / fixtures 30, 31
The screw hole in the element 30 has a sprue sideways with the hole (that is, in the
Only apply when there is no line or serration
Addictive. That is, the screw hole is a spline or serration.
Preferably, it is located in the area of the plate that does not. But,
If the screw hole is in an area with splines or serrations
If the screw fastener is to be
Into the bone until it is below the deepest part of the serration
Screwed. Then the plate / fixture 30 is inserted and the splice
34 moves unhindered over the top of the screw fastener,
Then through the hole in the plate 30, the screw fixing will be slightly loose
And can be flush with the upper surface 3 "of the bone.
A plate shaped to the size of the surface of the bone prepared for the purpose
The part 30 has good frictional engagement with the bone (one of the interference mating)
Type), which makes the pretensionin small in bone
Cause trouble. This fixed relationship helps improve the stability of the prosthesis.
Greatly contributes. After insertion, the spline or saw cut for the prosthesis
The toothed grooves are in close contact with the corresponding splines 34, 35 of the prosthesis element.
This specially prepared tibia
The middle prosthesis is securely fixed. This is illustrated in FIGS.
Most commonly found in 9 and 10. Then the upright part or
The flange 32 of the vertical filed flat bone of the tibia
The lower surface of the plate 30 is on a horizontally prepared surface
3 ". This arrangement of various on-plane splines / serrations
Greatly increase the surface area available for osseointegration,
On top, providing splines on the elongated fixture element,
Absorbs forces, and large areas of bone tissue expand and contract
Large surface area is available to make it possible
Can loosen joints or adversely affect the bone incorporation process
Torsion or rotation caused by the movement of plate 30 without
There is a special advantage that rolling is possible. The fixture is healthy
Inserted into the area of healthy bones and gives good integration
Elongated fixed without splines or serrations
The same stabilizing effect is possible but not exactly the same using
Noh. But of course, smaller stresses
Shapes with splines are better because they are added to points
Good. After aligning the prosthesis plate part 30, add the screw 21 and tighten.
You. The next step in this operation is to place the bed 40 (see FIG.
(See Reference). The floor is a sliding element 50 (artificial
Smooth upper surface on which one type of meniscus can slide
So that the bed 40 is usually a chromium / cobalt alloy,
Chromium / cobalt / molybdenum alloy or possibly
Made from materials such as lamic materials. But the above material
The fee is an example of a suitable choice, but of course is not within the scope of the invention.
There are no restrictions on the selection of materials. Deck 40, this is combined
Small protrusion that is almost flush with the top surface of
At the front end of the plate 30 using a raised or flange
Held in position. This is shown, for example, in FIG.
You. Laterally, the plate 40 may have another protrusion or possibly
It is held in place by the lower part of the flange 37,
The flange 37 is also intended to be restricted, but the sliding element 50 (added later)
Do not prevent lateral movement). Deck 40 slides out of place during normal use
The force applied to it is generally not
The floor 40 is placed upright on the board 30.
Snap fit between the flange elements 32, 33 and 37 (snap-fi
t) is preferred. Next, a durable plastic material (for example, ultra-high molecular weight poly)
The sliding element 50 of ethylene) is placed on the top of the bed 40.
Its location can be seen, for example, in FIG. Sliding element
50 indicates that the horizontal plane has its dimensions (in all directions)
The sliding element 50 slides on the surface of the plate 40
Can be centered / lateral and forward to a limited extent at the knee
/ Backward movement (or a combination of both) occurs
Enable. For example, as can be seen from FIG.
The upper surface 51 of the element 50 supports the head of the femur in the horizontal and vertical directions.
Depressed, allowed to provide a bearing surface
As a performance, a spherical hollow is made. The tibia side of the prosthesis is now ready. This letter of preparation
This is shown, for example, in FIGS. For some structural features of the prosthesis,
Metal parts, especially the plate 30, the tube-like fixture 31 and the flange 32
The main part of the prosthesis including the same as the screw fixing device 20 and the screw 21
And it is composed of commercially available pure titanium
Should be. This material is due to well-known mechanical properties
Is well-adapted to osteointegration but not to
Even because it has been found to be the best implant material
You. However, any material suitable for osseointegration can be used.
Obviously it can be used. As shown in FIG. 9, the main part of the prosthesis is divided into two sections.
Minute, the plate part and the elongated fixture part are formed.
Is usually welded together, often by laser welding
Solvent due to the highly reactive nature of molten titanium
An inert atmosphere is generally required during. Features of this surgical technique and prosthesis to replace a single head
Another advantage is to prepare the knee or install a prosthesis
Therefore, it is not necessary to remove the cruciate ligament in the knee joint.
You. This means, of course, that hole 2 is drilled in front of the knee (after
Is possible, but a nervous concentration can handle this.
And the fact that the knee ligament has been removed
Of the fact that it is attached at a point outside the circular
The result. Obviously, the fewer the disability of the joint, the healing
It may be in terms of healing time and effect. Prostheses having the spline / sawtooth connection described above are of course
Depending on the depth of the spline or serration,
Increase the surface area in contact with bone by 200% or more
Is one of the main reasons for improved stability and longevity
It is. The good fit of the parts is plate / fixture / flange /
It is ensured by accurate harmony such as splines
As is clear from the foregoing, nevertheless,
For example, a set of five different standard sized prosthetic elements
(Ie 5 sets of different size boards 30, etc.)
What can be done and after each pre-operative (eg x-ray) examination
It is intended that the most appropriate factor for the patient be selected
Have been. That is, for example, FIG. 10 correctly fits the end of the bone
Shows a prosthesis with a plate-like portion 30, but with some minor differences
possible. But this is extremely important
There is no. Figures 11-13 and 14 show two joint or prosthetic head prostheses.
3 shows different embodiments of the present invention. Single head unless otherwise noted
The principles and advantages that apply to prostheses are the
It will be clear that it works. Therefore, for example
Rasp splines / sawtooth grooves and possible materials
The principle of selection, as well as the shape of the general elements used, are the same
It is. Reference numerals used to describe the twin head embodiment
Is used for a single bone head type except that 100 is added
Same as the one. Thus, for example, 2 becomes 102
50 becomes 150. The preparation and fitting of the prosthesis is similar to that of the single head,
Performed during one-time surgery, but cruciate ligaments are removed
Section to perform surgery.
It needs to be cut and removed. For example, taking the embodiment in FIGS.
The upper bone is real during normal use with feet flat on the ground
It is cut so that it becomes horizontal horizontally. FIG. 5 (a),
Tools similar to those used in (b) and (c)
Flatten the surface using a perforation and appropriate splines
Alternatively, an upper surface of the tibia with a supra-saw groove is created, but this embodiment
To match the two perforations, obviously two on each tool
An elongate stretch is used, while for example the embodiment of FIG.
In this case, only one elongated stretch is required. However, after being cut, make a slot on the top of the bone
Between the spline / serrated elongated fixture 131 and the plate 130
Another hand in that the connection 138 must pass through
Surgery is required. The required type of slot 102 'and connection
A continuous connecting portion 138, such as a rib, requires a single fixture in FIG.
Shown in connection with the elementary embodiment. Obviously continuous part 138
Are small struts (ie, discontinuous rib connections) if desired
Similarly, it can be a series of vertical links,
Things are often considered useful. The reason
Bones can grow between the struts, and thus
The contact area for mounting is large,
Second, this possibility aids bone incorporation. Once the bone surface is prepared, then, as in the first example,
Screw fixing with external thread portions 120 and 120 'of different diameters
Provides holes of different diameters to receive fixture 120
In a two-step process, the bone is placed perpendicular to each remaining part of the head.
A hole is made. Each of the screw fasteners is fitted and corresponds to the first example given
Protrudes through a hard bone surface in a manner that does. Two tube-like saw teeth
The prepared plate 130 on which the shape fixture elements 131 are scheduled,
Until both screw fastener holes are mated with countersunk
Slide into place over the top surface of the bone. Fit screw 121
Mate and tighten. In addition, here is an example of a single head
Similarly, each of the threaded holes in plate 130 is typically a spline /
Placed outside the area of the plate 130 with serrations 134
(However, they may be inside this area
And again, as explained in connection with the single head example,
If you want to get the same plane as the screw fixture,
Unscrewing operation is required). this thing
Can be seen, for example, in FIG. Board 130 is also ready
Keel Fixation with Single Screw Hole 63 (Single Head)
(Not present in the mold) is integrally formed on its top surface
Is different. This keel is usually centered
It is formed, but of course, for example, as shown in FIG.
It may be off. In fact, due to the asymmetry of the condyles of the tibia,
Asymmetric boards are more common. In fact, the upper surface of the plate 130
Is almost asymmetric in any case. Breaking the keel fixture
The shape of the surface can be oval as shown, but other shapes
It is obviously possible. The keel fixture is described above as "formed" on the top surface
However, this expression means that the fixtures are formed separately,
So, of course, as long as the function does not change,
It also includes the possibility of being attached to a board. After sliding the board into place, snap the
Fit to the top surface of the board prepared by other methods
You. This top surface is, of course, kept “laterally” for
Including flanges, other protrusions, etc. that form the means to hold
May be. The plate 140 also fits within the plate 140 that fits tightly over the keel fixture 60.
It has a cutout 141 near the center, thus
Additional positioning means are provided. Board 140 is fitted
When you are done, add a keel 61 with a countersink 62 on the top,
Tighten screw 64 to hold assembly securely. Sliding element 150 with dimensions smaller than the upper area of
Squeeze from above according to the top of the board. The sliding element 150 is
Again, of a suitable plastic material (eg UHMWPE)
And a small amount of play in the horizontal plane (ie center / side and front /
Can accommodate a keel 61 with
The recess 152 has a lower surface. But exercise is vertical
Not directly possible. This movement is shown as "a" in FIG.
And the limited extent of the sliding element 150 on the surface of the plate 140
Movements, but still restrain them at the limit
You. The sliding element 150 also has a potentially spherical countersink
Top and raised with two upper recesses in the shape of
It has a central portion 153. As shown in Figure 11, the femoral condyles are
A "ring" in each of the minutes, and of course a countersunk surface ring
The ostium must fit properly into the femoral condyle. Femur
It may not need a prosthesis itself, but this is possible
The tibial replacement of the present invention, of course,
There is no contradiction as a whole. The sliding element 150 in position on the top of the bed 140 is shown in FIG.
Is shown in This figure also shows a gap on the left front side of the tibial prosthesis.
Move the sliding element 150 to leave (as shown)
Sliding is required at the position where free movement “a” (in FIG. 11) is possible.
Shows prime. The embodiment of FIG. 14 is a further preferred embodiment for a bicapsular prosthesis.
It is like. Only one hole 102 in the tibia being sawed
And drill one slot 102 '
Because it is good. The elongated fixture element 131 is shown in this drawing.
Clearly shown not in the center and on one side for this relationship
There are more splines than the other side. This is especially true for the tibia
Not only due to the asymmetry of the top of the
The fixture that is offset from the center of the plate 131 in the direction
Drilling and fitting of fixture element 131 disturbs patella
This is because they do not. As before, cut appropriately (according to the method described above)
When rubbed, the plate 130 is fixed to the fixture 131 and the joint.
Along 138, screw fasteners 120 (described above) are already
It is inserted into place on the prepared bone.
Also, as mentioned earlier, some type of interference fit (hundreds of millimeters)
Meters) and thus the bone surface
Gives some kind of pretensioning and ensures close alignment
And it is faster because of the smallest possible movement of the prosthesis.
It leads to incarnation. Slight vertical at the end of plate 130 on either side
Movement (ie, the circumference of an elongated fixture
The rotational movement of the enclosure) is acted upon by splines 136
Bone splices even when the prosthesis is not a secure fit
Fixation without loosening the joints or
It does not affect the process. As mentioned earlier,
Principles or serrations are not required, but should be
A larger surface area to absorb the rotational force is obtained. As seen in this figure, the same applies to the previous embodiment.
It fits flush with the flange 133 in front of the plate 130
As shown, the bed 140 with a concave edge shown at 142
You. A similar recess or flattened edge is required
If you feel it is, add it at the center / side edge of plate 140
Or alone. But on board 130
In most cases keel so that the above flange is not needed
Fixtures 60, 61 provide sufficient center / lateral stability. Screws 121 are fitted together and floor 140 is fixed on keel fixture 60
To match the location. As a result, the keel is
Locked in place with the help of mating sliding element 150
You. Another advantageous embodiment of the bicapsular prosthesis is illustrated in FIGS.
Is done. The main features of this embodiment and the above-described bicapsular prosthesis
The difference is that if the prosthesis is implanted in the tibia,
In this embodiment, the elongate fixture is a median plane (sagittal plan).
e) is designed to be oriented at an angle to
While the elongated fixture in the above embodiment is
When installed, it is oriented parallel to the median plane.
It is being measured. For simplicity, the following description will refer to the previous embodiment.
Only the different features will be described. That is, for example, the prosthesis
With or without splines
Or one asymmetrically arranged elongated fixture if
Or two more or less symmetrically arranged elongated fixtures
Tool can be provided. Parts not described in detail, e.g.
All moving elements etc. are parts used in the above embodiment
May be the same as That is, the prosthesis in the embodiment according to FIGS.
Two tube-like attached to plate 230 by part 238
It comprises a plate 230 with an elongated fixture 231. Board 230 also
Mounting screw 254 passing through connecting part 238 and fixture 231
With a perforation 253 for The arrangement of this hole 253
Enough to make sure that the head of
Allows the perforations to be drilled to a reasonable degree.
The screw 254 has an outer peripheral groove 255, and the fixture 231 has one
A vertical screw hole extending from one end to the other hole 253 across hole 253
It has 256. Using these holes and grooves, the screw 254
8 Groove 255 by lock screw 257 threaded in
And can be locked. These perforations
And the function of the mounting screw mainly during the healing period, the prosthesis
Is to lock against exercise. Line AA is the median plane when plate 130 is slid over the tibia.
Is shown. As shown in Figure 15, the vertical direction of the fixture
Makes an angle θ with the line AA. Angle θ is between 5 ° and 45 °
May vary, but preferably 15 ° to 35 °, most preferably
Is between 20 ゜ and 30 ゜. In the illustrated embodiment,
The angle θ is chosen to be 20 °. There are several advantages associated with this design. One heavy
The key advantage is that access to the knee joint is much easier.
And When the fixture is oriented obliquely to the median plane
The fact is that after cutting the anterior cruciate ligament,
Without disturbing the patella from the front of the part
Means that cutting and drilling operations can be performed.
You. Because the patella and patella ligament can be easily pushed aside
Because it can be Apart from this,
The operation is essentially an implantation of the embodiment according to FIGS.
Operation can be performed in the same manner as the Implant
After sliding it into place,
A hole can be drilled in the bone through hole 253 in plate 230,
The thread 254 is preferably a self-tapping screw,
Can be screwed into bone. Inner screw 254, of course, outer
Before each screw 254 is inserted, each lock screw 254
Must be locked by. In this context, the attachment to the fixture described here
Positioning of the holes and coupling parts is the embodiment according to FIGS.
is there. Another important advantage of this embodiment is that the prosthesis is
It has great stability against movement. Plank 230
Is oriented in the median plane during normal joint movements of the knee joint
Receiving power. These movements are mainly oriented in the median plane
Because there is. However, the fixture does not
Most of these forces are absorbed due to the oblique orientation. this
That also means that the mounting screws may
Meaningful, but not strictly necessary. The upper cut surface of the tibia is also used to secure the plate (20, 12
0) is not required, so there is less disturbance and consequently the plate 230
Fits well against the underside. Other results are the plate and tibia
Large contact area between the board and most of the load on the board is fixed
The danger of being absorbed by the tool
You. This in turn enhances bone incorporation and risks bone resorption.
Reduce steepness. The distribution of the load acting on the plate 230 is balanced,
In the direction of the axis in the oblique fixture, or
Bends along the edge of the
Rotational movements are also largely prevented. The embodiment according to FIGS. 18 and 19 has only one elongated fixture.
Is different from the above embodiment in that
That is, reference numeral 230 is a plate, 231 is an elongated fixture, and 233 is
Flange for holding 40, 236 for sprue on elongated fixture
In, 201 is the tibia, and reference numerals 61 and 64 are
Indicates the parts to be held. The advantage of this embodiment is largely the advantage according to FIGS.
Is the same as However, it should be noted that in the twin head form of the present invention,
Is necessary for the fixation or mounting screws
The necessity is small. Although specific embodiments have been described, the embodiments
Limit the scope of the invention as defined by the claims
Should not be solved.
Continuation of the front page (72) Inventor Jakobson, Magnus Sweden S-412 66 G. Tevolui. Oran Guerrivien 11 (72) Inventor Lyoströnd, Told Sweden S-430 41 Kutla Weik. Huasang Steigen 2 (72) Inventor Wenberg, Steig Sweden S-424 57 Annie Eled. P.L. 6266 (56) Reference French Patent Application Publication 2630640 (FR, A1) (58) Fields investigated (Int. Cl. 7 , DB name) A61F 2/38 A61F 2/46 WPI (DIALOG)
(57) Claims 1. A joint prosthesis for permanent fixation in bone tissue at a joint of a human body, particularly at a joint end of a first joint portion of a knee joint, wherein A defined primary interface is defined, the joint prosthesis is adapted for only one operation, and the primary anterior and after resection of the original joint end or a portion of the original joint end, A flat, plate-like element having an articulating end or part of the articulating end of the first interface, having a complementary bone surface and a major posterior surface adapted to engage in use; and Offset mounting on the posterior surface allows at least one cylindrical fixture to be placed in a healthy, relatively intact bone during use to serve as a center of rotation for any movement of the plate-like element. Allowing the at least one cylindrical Fixing the joint prosthesis to bone tissue at an end of the joint of the first joint portion, wherein the at least one cylindrical fastener has an angle with respect to the predetermined main joint surface. The prosthesis of any of the preceding claims, wherein the at least one cylindrical fastener is disposed relative to the plate-like element so that it can be tilted. 2. The method according to claim 1, wherein said cylindrical fixture is oriented along a plane which is at an angle of 15 ° to 45 ° with respect to said predetermined main joining surface. Joint prosthesis. 3. The method according to claim 1, wherein said cylindrical fixture is oriented along a plane which is at an angle of 15 ° to 35 ° with respect to said predetermined main joint surface. Joint prosthesis. 4. The apparatus of claim 1, wherein said cylindrical fixture is oriented along a plane that forms an angle of between 20 ° and 30 ° with respect to said predetermined major interface. Joint prosthesis. 5. The at least one cylindrical fixed wing,
The joint prosthesis according to claim 1, further comprising a spline or serration on an outer surface thereof. 6. The plate-like element according to claim 1, wherein a main rear surface of the plate-like element has a spline or serration extending in a direction substantially parallel to an axis of the at least one cylindrical fixture. The joint prosthesis according to any one of the above. 7. The plate-like element includes one or more openings extending from a main front surface to a main rear surface and gradually extending from the main front surface, the plate-like element and at least one cylindrical member. The fastener forms the main component of the joint prosthesis, and the joint prosthesis further includes a mounting screw for each opening, which, in use, penetrates the relevant opening by passing through the relevant opening. The joint prosthesis according to any one of claims 1 to 6, wherein the joint prosthesis is fixed to a joint end of a first joint portion of the joint. 8. A dependent according to claim 6, wherein said openings in said plate-like element are arranged so as to open in areas without splines or serrations on the main rear face of said plate-like element. The joint prosthesis according to claim 7, wherein: 9. The joint prosthesis includes one or more self-tapping screw fastener elements for implantation of the articulating end of the first joint of the joint into bone tissue, and wherein the mounting screw is Has a threaded shank adapted to be inserted into a threaded hole of said screw fastener element or one of said screw fastener elements through a relevant aperture in use. 9. The joint prosthesis according to 8. 10. The screw fastener element of claim 2, wherein the screw fastener elements have different diameters.
A substantially flat anterior surface including two integral cylindrical portions and having the screw holes open therethrough, and for securing the screw fastener element to bone tissue at the articulating end of the first joint of the joint. The joint prosthesis according to claim 9, further comprising an external thread. 11. The plate-like element, the one or more rib elements, and the one or more rib elements, wherein the cylindrical fixture is mounted offset to a major rear surface of the plate-like element by one or more rib elements. Forming a main component of the joint prosthesis, wherein one or more openings are provided in the main component, wherein the opening is formed from a main front surface of the plate-like element and one of the rib elements and Extending protruding rearward through the cylindrical fixture, the joint prosthesis further includes a mounting screw for each opening, the mounting screw connecting the main component to the first joint of the joint. To fix to the end bone tissue,
7. The joint prosthesis according to claim 1, wherein the joint prosthesis is adapted to be inserted into a relevant opening. 12. The cylindrical fastener according to claim 1, further comprising an axial threaded hole, wherein said joint prosthesis further comprises one or more locking screws for positioning in each axial threaded hole, said locking screw being in use. 12. The joint prosthesis according to claim 11, wherein the joint prosthesis is adapted to act on one of the mounting screws to lock the mounting screw in place. 13. A joint prosthesis as claimed in claim 1, wherein said joint prosthesis comprises a cylindrical fastener which is mounted approximately centrally on the main posterior surface of said plate-like element. A joint prosthesis as described. 14. The plate-like element having a keel fastener protruding from its major front surface, the keel fastener being substantially centered on the major front surface of the plate-like element. 14. The joint prosthesis according to any one of 1 to 13. 15. The joint prosthesis comprising: (i) a flat support element having a major anterior surface and a posterior surface, wherein the support element is keel-secured by penetrating it from the major anterior surface to a major posterior surface. To the tool,
And (ii) having a rounded front surface and a depressed rear surface so that the main rear surface of the support element just rests on the main front surface of the plate-like element; and 15. The joint prosthesis according to claim 14, further comprising: a keel secured to the keel fixture during use to ensure a predetermined position on the plate-like element. 16. The joint prosthesis includes a sliding element adapted for use on a major front surface of the support element,
16. The joint prosthesis according to claim 15, wherein the sliding element has a front countersink, for example a spherical countersink, for cooperating with the articulating end of the second joint of the joint. 17. The joint prosthesis according to claim 16, wherein said sliding element is made of ultra high molecular weight polyethylene. 18. The sliding element further comprising a recess in its rear surface for receiving the keel, wherein the recess is larger than the keel to provide limited free movement of the sliding element across the main front surface of the support element. 18. The joint prosthesis according to claim 16, wherein the joint prosthesis is enabled. 19. The method according to claim 19, wherein the support element is a cobalt / chromium alloy.
19. The joint prosthesis according to claim 15, wherein the joint prosthesis is made of a cobalt / chromium / molybdenum alloy or a ceramic material. 20. The joint prosthesis according to claim 19, wherein the other elements of the joint prosthesis are made of pure titanium.
JP52013493A 1992-05-18 1993-05-14 Apparatus for preparing bone before fixation of joint prosthesis and prosthesis Expired - Fee Related JP3517413B2 (en)
SE9201557-7 1992-05-18
JPH07506745A JPH07506745A (en) 1995-07-27
JP3517413B2 true JP3517413B2 (en) 2004-04-12
JP52013493A Expired - Fee Related JP3517413B2 (en) 1992-05-18 1993-05-14 Apparatus for preparing bone before fixation of joint prosthesis and prosthesis