JP2003210478A - Plate for ulnar proximal crush fracture fixation - Google Patents

Abstract

(57) [Summary] [PROBLEMS] There is currently no appropriate method for fixing a fracture fracture in the proximal ulna. Current methods do not have sufficient bone fixation, and as a result, a reliable bone fusion cannot be expected. SOLUTION: A wing (2) having a screw hole (4).
In the center between the sides of the plate, there are a plurality of longitudinal screw holes (3), and the longitudinal proximal end (5) has a hook (5) for grasping and fixing the proximal bone fragments. 7)
The ground bone of the proximal ulna, including the olecranon, is screwed using a plate for fixing the ground fracture of the proximal ulna, which is curved so that it can be placed and fixed on the dorsal side of the ulna (FIG. 3). Is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone fixing plate, and more particularly to a plate for fixing bones of a crushed fracture of the proximal ulna.

[0002]

2. Description of the Prior Art A simple fracture of the proximal ulna (elbow head) is fixed by a sleeve with a pin (Medical device approval number: 21200).
BZY00214000)
ndwiring method (Senori Itoman et al .: New tensio)
n band wiring system (pin-s
Development of the leave system); Clinical Orthopedic No. 3
Vol. 4, No. 6, 735-744 (1999)) is the best method, but crushed fracture cannot obtain stable fixation by the tension band wiring method using a sleeve with a pin and cannot hold the reduction position. Reconstruction plate (Medical device approval number: 20700
BZY00852000) and the like are also used, but the fixing force of the crushed bone fragments is not sufficient even by this method.

[0003]

As described above, the fixation of crushed fractures of the proximal ulna including the olecranon is insufficient in the bone fixing force by the method currently used, and as a result, a reliable bone fusion is achieved. Can not be expected.

[0004]

In order to make up for such drawbacks, the present invention was devised in order to ensure bone union by providing a bone fixing plate with a tension band function having excellent fixability. .

The basic concept for strengthening the insufficient bone fixing force, which is a conventional defect, is as follows.
1) Tensio by placing the plate on the dorsal side of the ulna
n band function. 2) Tension by securely grasping the small fragment of the proximal part with the hook
It has a band function. 3) The crushed bone fragments in the middle are fixed with a screw that passes through a hole in the wing to give a strong fixing property.

The ulnar proximal end crush fracture fixing plate of the present invention, which is based on the above-mentioned basic concept, solves the problems of the prior art, and is a bone fixation for firmly fixing the crush fracture of the proximal ulna. Plate having blades (2) with holes (4) for screws on both sides, and there are a plurality of screw holes (3) in the longitudinal direction at the center between both sides of the plate, and the tip in the longitudinal direction. The part is a hook (7) for gripping and fixing the proximal bone fragment, and the cross section is curved in a 1/3 circle shape so that it can be installed and fixed on the dorsal side of the ulna (Fig. 3). It is a proximal end crush fracture fixation plate.

An ordinary reconstruction plate has a flat plate and has no wings or hooks and is a tensio.
Although it is unsuitable for fixation of fractures in this part where n band fixation is required, the ulnar proximal end crush fracture fixation plate according to the present invention has a cross section of 1/3 circle so that it can be installed and fixed on the dorsal side of the ulna. It has a curved shape (Fig. 3), holds the olecranon with the hook (7), and passes the screw through the hole in the wing to fix the bone. It has the feature that it can be fixed and its fixing force is large.

The ulnar proximal end crush fracture fixing plate of the present invention comprises a main body (1) and wings (2), and the plate can be installed and fixed in conformity with the shape of the dorsal side of the ulna in the longitudinal direction. Like this, the cross section of the main body is bent into a 1/3 circular shape (Fig. 3). In its central part there are a plurality of holes (3) for screws in the longitudinal direction. Also, on both sides of the plate are wings with screw holes (4). The 1/3 circular shape in the present invention means, in addition to the shape shown in FIG. 3, 1/3 of a perfect circle, 1/3 including the long axis tip of an ellipse, or a bell shape, but the most preferable. Is the shape shown in FIG. The number and arrangement of the blades may be different on the left and right sides, but it is more preferable that the right and left sides are paired in the same number. There are no particular restrictions on the shape of the wing, such as semi-circular and semi-elliptical rounded shapes, regular angles, and oblong angles, but rounded shapes such as semi-circular and semi-elliptical shapes. Is more preferable because it does not stimulate soft tissue. The proximal end (5) of the plate is a curved hook (7) to more securely grip and secure the proximal bone fragment. The shape of the distal end (6) of the plate can be any shape, such as semi-circular, semi-elliptical, angular, branched, but opposite the bone contact surface to reduce soft tissue irritation. The surface is preferably tapered.

The number of blades (2) is not particularly limited, but usually,
3 to 7 pairs (6 to 14 pieces), preferably 4 to 6 pairs (8 to 1)
2). The wing (2) has a hole (4) through which a screw is passed to secure the plate to the bone,
Fixation with a screw of 2 pairs (6 pieces) or less is not enough to fix the crushed proximal ulna fracture, and 7 pairs (14 pieces)
It is rare that the above screw will cause the need for fixation through the blade (2). At the center between both sides of the plate there is a hole (3) for the screw in the longitudinal direction, through which screw is passed to fix the bone to the plate. Although the number of the holes is not particularly limited, it is usually 3 to 15, preferably 5
~ 13 pieces. Fixation of crushed fractures of the proximal ulna is not sufficient with fixation with 2 or less screws.
It is unlikely that more than one screw will need to be secured through the body.

In the hole (3) in the body for the screw,
The first hole from the proximal end (5) of the plate is usually
Fix the bone to the plate through a 2.7 mm cortical screw. Therefore, the diameter of the hole is usually 2.8m.
It is m to 4.0 mm, preferably 3.0 mm to 3.5 mm. Also, a 3.5 mm cortical screw is usually passed through the holes from the proximal end (5) of the plate to the second to the last to fix the plate to the bone. Therefore, the diameter of the hole is usually 3.6 mm to 5.0 mm, preferably 3.
It is 7 mm to 4.5 mm. The screw used should be of a size that fits the hole.

The plate thickness is 0.9 mm to 2.7 m.
m, preferably 1.0 mm to 2.6 mm. The central part of the plate is thickest, and the thickness becomes smaller toward the edge of the plate and the tip of the blade. Generally, the thickness (L1) of the center of the plate is 2.6 mm, the thickness (L2) of the edge of the plate is 2 mm, and the thickness (L3) of the tip of the blade is 1 m.
m is preferred.

The width (PW) of the plate is usually 8 mm to 30
mm, preferably 8 mm to 12 mm, and the hook length (FL) is usually 6 mm to 15 mm, preferably 8 mm to
It is 12 mm. Plate length (PL) is usually 100
mm-200 mm, preferably 130 mm-170 mm
The width (WW) of the blade is usually 5 mm to 10 mm, preferably 6 mm to 8 mm.

The length (WL2) of the second blade from the proximal end of the plate is usually 5 mm to 15 mm, preferably 8 m.
The length (WL1) of other blades is usually 5 mm to 13 mm, preferably 6 mm to 8 mm.

The distance (WD) between adjacent blades is not particularly limited, but is usually 5 mm to 15 mm, preferably 6 mm.
mm to 12 mm.

The ulnar proximal crushed bone fracture fixation plate in the present invention is made of pure titanium, titanium alloy, stainless steel, cobalt-chromium alloy, metal materials such as tantalum, hydroxyapatite, alumina, carbon, calcium phosphate, crystallized glass, Ceramics such as silicon nitride and titanium oxide, polymethylmethacrylate, polysulfone,
Polymer materials such as polyethylene, polypropylene, polyacrylonitrile-butadiene-styrene copolymer (ABS resin), polycarbonate, polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, and these polymeric materials and hydroxyapatite And the like can be used. From the viewpoint of strength, biocompatibility, corrosion resistance, durability, etc., titanium alloy, pure titanium, cobalt
Chromium alloy, stainless steel, a complex of bioabsorbable polymer material and hydroxyapatite, and the like are preferable. Of these, pure titanium and titanium alloy are excellent in biocompatibility, corrosion resistance, elasticity, light weight, operability, and the like. In addition, stainless steel is excellent in strength and retention of fixing force.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the invention for the ulnar proximal end crush fracture fixing plate according to the present invention will be described below.

The ulnar proximal end crush fracture fixing plate according to the present invention is shown in FIGS. 1 to 4 as an example. The ulnar proximal end crush fracture fixation plate according to the present invention is not limited to that shown in this drawing. 1 is a plan view of the ulnar proximal end crush fracture fixing plate of the present invention, FIG. 2 is a side view, and FIG.
Shows a cross-sectional view (cross-section A in FIG. 1) and FIG. 4 shows a diagram in which the ulnar proximal end crush bone is fixed by the ulnar proximal end crush fracture fixing plate of the present invention, respectively.

The size is, as an example, the number of blades (2) with holes (4) for the 2.7 mm cortical screw is five.
Pair (10), the number of holes (3) in the central longitudinal direction between both sides of the plate is 9, the diameter of the holes for the 2.7mm cortical screw is 3.2mm, 3.5mm cortical screw Hole diameter is 4.1 mm, plate width (PW) is 10 mm, plate center thickness (L1)
Is 2.6 mm, and the thickness (L2) of the plate return edge is 2.0
mm, the blade tip thickness (L3) is 1 mm, the plate length (PL) is 160 mm, and the blade width (WW) is 7.0 m.
m, length of the second blade from the tip of the plate (WL2)
Is 10.0 mm, and other blade lengths (WL1) are 7.
The distance between adjacent blades (WD) is 0 mm, the hook length (FL) is 10 mm, and the material is titanium alloy.

FIG. 4 is a view in which crushed bones of the ulnar proximal end are fixed by the plate for fixing crushed fractures of the ulnar proximal end of the present invention, and as is apparent from this figure, the hook (7 ) Is used to fix the olecranon bone and to fix the bone with the screw through the hole in the wing (2), so more crushed bone fragments can be fixed and much larger fixation than with the conventional reconstruction plate. Bone can be fixed by force. Since a more reliable bone fixing force can be secured, by starting joint movement early, more favorable bone fusion can be expected while preventing contraction of the elbow joint.

[0020]

As described above, according to the present invention, in fixing crushed fractures of the proximal end of the ulna, more crushed bone fragments can be fixed, as compared with the case of using a conventional reconstruction plate, and much more. The bone can be fixed with a large fixing force. Thereby, more preferable bone fusion can be expected.

[Brief description of drawings]

FIG. 1 is a plan view of a plate for crushing fractured proximal ulna of the present invention.

FIG. 2 is a side view of the ulnar proximal end crush fracture fixing plate of the present invention.

FIG. 3 is a cross-sectional view of the ulnar proximal end crush fracture fixing plate of the present invention (cross-section A in FIG. 1).

FIG. 4 is a view showing that the ulnar proximal end crushed bone is fixed by the ulna proximal end crush fracture fixing plate of the present invention.

[Explanation of symbols]

1 body 2 wings 3 Body holes for screws 4 Wing holes for screws 5 Proximal end of plate 6 Distal end of plate 7 hooks 8 screws 9 crushed bone A cross section PL plate length PW plate width WW Wing width WL1 Wing length 1 WL2 Wing length 2 Distance between WD wings FL hook length L1 Plate center thickness L2 plate return edge thickness L3 wing tip thickness

Claims (15)

[Claims] 1. A bone fixation plate for favorably fixing crushed fractures of the proximal ulna including the olecranon, which has wings (2) having screw holes (4) on both sides and both sides of the plate. There are several longitudinal holes for screws (3) in the middle, and the longitudinal proximal end (5) is a curved hook (7) for gripping and fixing proximal bone fragments. A plate for fixing a crush fracture of the proximal ulna that has a ⅓ circular cross section so that it can be installed and fixed on the dorsal side of the ulna. 2. The ulnar proximal end crush fracture fixation plate according to claim 1, characterized in that the longitudinal distal end (6) of the plate is tapered. 3. The ulnar proximal end crush fracture fixation plate according to claim 1, wherein the wings on both sides of the plate are paired. 4. The ulnar proximal end crush fracture fixing plate according to claim 3, wherein the number of wings is 4 to 6 pairs (8 to 12). 5. The ulnar proximal end crush according to any one of claims 1 to 4, wherein there are 5 to 13 screw holes in the longitudinal direction of the central portion between both sides of the plate. Plate for bone fracture fixation. 6. In the hole of the body for the screw, the diameter of the first hole from the proximal end of the plate is from 3.0 mm.
3.5 mm, and the diameter of the hole from the second to the end is 3.7 mm to 4.5 mm, The ulnar proximal end crush fracture fixation according to any one of claims 1 to 5, wherein Plate. 7. The plate has a thickness of 1.0 mm to 2.6 m.
The ulnar proximal end crush fracture fixing plate according to any one of claims 1 to 6, wherein m is m. 8. The width (PW) of the plate is 8 mm to 12 m.
The ulnar proximal end crush fracture fixing plate according to any one of claims 1 to 7, wherein m is m. 9. The ulnar proximal end crush fracture fixation plate according to claim 1, wherein a hook length (FL) is 8 mm to 12 mm. 10. The plate length (PL) is 130 mm.
The plate for crushing the ulnar proximal end crush fracture according to any one of claims 1 to 9, wherein the plate has a diameter of ˜170 mm. 11. The ulnar proximal end comminuted fracture fixation plate according to claim 1, wherein the width (WW) of the wing is 6 mm to 8 mm. 12. The length (WL2) of the second blade from the proximal end of the plate is 8 mm to 12 mm, and the other blades (WL1) have a length of 6 mm to 8 mm. The ulnar proximal end crush fracture fixation plate according to any one of claims 1 to 11. 13. The distance (WD) between adjacent blades is 6
It is mm-12mm, It is characterized by the above-mentioned.
The ulnar proximal end crush fracture fixation plate according to any one of 1. 14. The ulnar proximal end crush fracture fixation plate according to claim 1, wherein the material is a titanium alloy or pure titanium. 15. The ulnar proximal end crush fracture fixation plate according to claim 1, wherein the material is stainless steel or a cobalt-chromium alloy.