WO2016013123A1 - Bone binding braid, and method for producing bone binding braid - Google Patents

Abstract

A bone binding braid (1, 11, 12) has a braid main body (2). The braid main body (2) is composed of multiple base wires (21). The base wires (21) are woven to form the hollow braid main body (2). Each of the base wires (21) is composed of one or multiple metallic filaments. A penetrating blade (3) is provided at one end of the braid main body (2), and a buckle (4) is provided at the other end of the braid main body (2). When it is intended to bind a breast bone (5) which has been cut, a physician allows the braid main body (2) to pass around the breast bone (5) while incising tissues surrounding the breast bone (5) with the penetrating blade (3). At this time, the braid main body (2) extends in the length direction while keeping the cross-sectional shape of the braid main body (2) in a circular or oval shape. Therefore, the braid main body (2) hardly damages the tissues. Thereafter, when the physician allows one end of the braid main body (2) to pass through a long hole (41) in the buckle (4) and then pulls the one end, the braid main body (2) is pushed against the periphery of the breast bone (5) while further extending, resulting in the deformation of the braid main body (2) into a flat plate-like shape. In this manner, the breast bone (5) can be bound stably.

Description

Bone uniting cord and method for producing bone uniting cord

The present invention relates to a bundling cord used for bundling longitudinally torn bones, and a method for producing a bundling cord.

For example, when performing a surgical operation that requires thoracotomy, a bone called the sternum in the center of the chest is cut open in the longitudinal direction, and the prescribed treatment is performed. Finally, the cut sternum is used as a binding thread. The technique of uniting is performed.

Conventionally, as the tying yarn used in such a thoracotomy, a single wire stainless steel wire or a plate-like stainless steel plate has been used.

Recently, a single thin thread or wire is used alone, or a single wire or a plurality of loops are formed by interweaving and knitting a wire and a wire. Or, the wire is straight and has a feature that it is easy to fasten by using a hole in the ring at the time of knotting (bundling), and a straight needle or a curved needle that penetrates the sternum is connected to both ends or one end. A material for suture of the sternum has been developed in which only the end to which is connected is squeezed and knitted narrower than the central portion (for example, see Patent Document 1 below).

In addition, a bone fastening hollow cable formed by braiding fibers into a tubular shape having a substantially circular cross section has been developed (for example, see Patent Document 2 below).

These tying yarns are all wound around the outer circumference of the sternum, and then the ends are fastened to bind the sternum.

JP 2003-79632 A JP 2008-43431 A

Among the tying yarns, those made of a single wire stainless steel wire have an advantage that the risk of tissue damage when passing around the sternum during sternum bundling work is reduced because the cross-sectional shape is a striate having a circular shape. On the other hand, it is difficult to adjust the force when tying around the sternum, and the tying thread that makes a line contact with the sternum bites into the sternum and sometimes causes the patient to feel uncomfortable or tender.

On the other hand, among the tying yarns, those made of a belt-shaped stainless steel plate can be tied around the sternum while being in surface contact with the outer peripheral surface of the sternum, so that the sternum can be fixed relatively stably. However, the binding yarn made of a belt-like stainless steel plate is curved only in the surface direction and not curved in the edge direction, so that it is inferior in workability when passing around the sternum when binding the sternum. In addition, tissue damage around the sternum is likely to occur at the edge during hand movement, and the hemostatic treatment tends to increase the operation time.

In addition, since the binding yarn made of a single wire stainless steel wire or a belt-like stainless steel plate is not stretchable, loosening may occur after binding, and the sternum may be insufficiently bound.

In this regard, since the material for suturing the sternum described in Patent Document 1 is stretchable, there is an advantage that the occurrence of loosening after binding is relatively reduced. However, since the material for suturing the sternum described in Patent Document 1 becomes a striatum when tension is applied at the time of tying, it makes line contact with the sternum as in the case of the aforementioned single wire stainless steel wire, and the sternum May bite into.

In addition, although the patent document 1 discloses that the central portion located in the sternum is a tape-shaped plain weave, in the case of such a shape, the above-described belt-shaped stainless steel plate is used. Like this, tissue damage is likely to occur at the edge during hand movement.

On the other hand, the bone fastening hollow cable described in Patent Document 2 has a circular cross-sectional shape at the time of hand movement, reduces the risk of tissue damage, and is deformed into a band shape at the time of binding, so that bone collapse and damage are less likely to occur. There are advantages to doing. However, since the hollow cable for bone fastening described in Patent Document 2 is braided by plain weave or oblique weave, there is almost no stretchability in the length direction, and a single wire stainless steel wire or strip As in the case of the binding yarn made of a stainless steel plate, loosening may occur after binding, and the sternum may be insufficiently bound.

The present invention has been developed in view of the above technical problem, and can reduce the risk of damage to the tissue existing around the bone when passing around the bone at the time of hand movement, and can stably bind the bone. An object of the present invention is to provide a novel bone binding cord and a method for producing the bone binding cord.

In order to solve the above technical problem, the bone uniting cord of the present invention is a bone uniting cord used when bundling longitudinally torn bones, and is a single wire of a metal filament or a metal filament A plurality of basic lines composed of convergent lines, comprising a cord body that is braided in a state of crossing each other, and during handling, the cross-sectional shape of the cord body maintains a circular or elliptical shape. The cord body is knitted into the basic line so that it can be expanded and contracted in the length direction and flatly deformed into a flat plate shape when the bones are bound, so that it can come into surface contact with the surface of the bone. A hollow braided body having a net-like peripheral wall configured by the above-described structure, and each of the basic lines constituting the peripheral wall is spirally arranged along the peripheral wall (hereinafter referred to as the present invention cord). Called the body).

In the cord of the present invention, the basic line is preferably a parallel arrangement type converging line in which a plurality of metal filaments are adjacent to each other along the length direction (hereinafter referred to as this mode). This is called the first cord of the present invention).

In the first cord of the present invention, the basic line is preferably a parallel-arranged convergent line in which two or three metal filaments are adjacent to each other along the length direction. .

In the first cord of the present invention, it is preferable that the metal filament has a wire diameter of 9 to 300 μm.

In the cord of the present invention, the basic wire is preferably a twisted wire-type converging wire formed by twisting a plurality of metal filaments (this mode is hereinafter referred to as the second embodiment of the present invention). It is called a cord.)

In the second cord of the present invention, the basic wire is a cored twisted wire type converging wire formed by winding a plurality of metal filaments around a single metal filament as a core material Is a preferred embodiment.

In the second cord of the present invention, the metal filament having a wire diameter of 3 to 150 μm is a preferred embodiment.

In the second cord of the present invention, it is preferable that the basic line does not have a twist that twists about the virtual axis of the basic line.

In the cord of the present invention, when the cord body is pulled under the following test conditions, a tensile stress required to pull at least 2 mm is 15 N or less.

<Test>
The cord body is held at a chuck distance of 200 mm, and the tensile stress is measured while pulling the cord body in the length direction at a tensile speed of 5 mm per minute.

In the cord of the present invention, when the cord body is pulled according to the test conditions, if the tensile stress is 100 N or less, then the stretchability is restored when the test force is not applied. This is a preferred embodiment.

The method for manufacturing a bundling cord of the present invention is a method of manufacturing the second cord of the present invention, and before braiding the basic line, the basic line is twisted around the axis. A twist is imparted, and the basic line is braided in a direction in which the twist is unwound.

According to the present invention, when passing around the bone at the time of hand movement, there is little risk of damage to the tissue existing around the bone, and the bone can be stably bound.

FIG. 1 (a) is a perspective view showing an outline of the overall configuration of the cord of the present invention according to Embodiment 1, and FIG. 1 (b) is a cross section showing a stretched state of the cord body in the cord of the present invention. Fig. 1 (c) is a plan view showing a stretched state of the cord body in the cord of the present invention, and Fig. 1 (d) is a flat deformation of the cord body of the cord of the present invention. It is sectional drawing which shows a state. FIG. 2 (a) is a plan view showing a state in which the sternum is bound by the cord of the present invention. FIG. 2 (b) is a diagram before the cord of the present invention is wound around the sternum and bound. FIG. 2C is a cross-sectional view showing a state in which the sternum is bound by the cord of the present invention. FIG. 3 is a graph showing the expansion and contraction characteristics of the cord of the present invention. FIG. 4 is a graph showing the expansion / contraction characteristics of a conventional tying yarn. FIG. 5 is a perspective view showing an outline of the overall configuration of the cord of the present invention (the first cord of the present invention) according to Embodiment 2. FIG. 6A is a perspective view showing an outline of the overall configuration of the cord of the present invention (second cord of the present invention) according to Embodiment 3, and FIG. 6B shows the configuration of the cord of the present invention. It is a sectional view showing a basic line.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

<Embodiment 1>
FIG. 1A shows an outline of the overall configuration of the cord 1 of the present invention according to the first embodiment. The cable body 1 of the present invention includes a cable body 2, a penetrating blade 3 provided on one end side of the cable body 2, and a buckle 4 provided on the other end side of the cable body 2. To do.

As shown in the enlarged view of FIG. 1 (a) (enlarged view of the middle portion of the cord body 2), the cord body 2 is a single wire of a metal filament (in this embodiment, a stainless steel filament). A plurality of basic lines 21 (48 in this embodiment) are braided so as to cross each other. The cord body 2 is formed by knitting each of the basic wires 21 into a net-like peripheral wall by arranging each of the basic wires 21 in a spiral shape, thereby forming a hollow braided body as a whole. It is. In the present invention, “tubular knitting” is a knitting method called warp knitting that does not distinguish between warp and weft, and each basic line 21 constituting the cord body 2 is connected to the cord body 2. It means a knitting method in which braiding is performed by alternately intersecting each other while being arranged so as to run spirally at the same spiral pitch around the axis. The cord body 2 braided by the tubular knitting has an axis of the cord body 2 and a running direction of each basic line 21 running spirally with respect to the length direction of the cord body 2. The formed angles are equal at any position of the cord body 1.

The wire diameter (φ) of the basic line (in the case of the present embodiment, a single filament wire) 21 constituting the cord body 2 is used as the strength and thickness required for the cord body 2 or used. What is necessary is just to determine suitably according to the number of the basic lines 21, and it does not specifically limit. The wire diameter (φ) of the basic wire 21 is preferably 9 to 300 μm (more preferably 15 to 150 μm).

In the present embodiment, the basic wire 21 is made of stainless steel, but the basic wire 21 is preferably made of a corrosion-resistant metal such as nickel titanium alloy or titanium alloy in addition to stainless steel. Used.

Further, in this embodiment, the peripheral wall of the cord body 2 is constituted by 48 basic lines 21 for convenience, but the number of the basic lines 21 constituting the peripheral wall is 30 to 100. (More preferably, it is in the range of 36 to 96).

The length of the cord body 2 is not particularly limited as long as the cord body 2 has a length that can circulate around the outer circumference of the bone to be bound in a state where the tightening allowance at the time of binding is left. The length of the cord body 2 is preferably 10 to 100 cm (more preferably 15 to 65 cm).

As shown in FIGS. 1 (b) and 1 (c), the cord body 2 having such a structure has a length while contracting its wire diameter when a tensile stress is applied along the length direction. When stretched in the direction and then released from the tensile stress along the length direction, it has a property (stretchability) that elastically recovers to its original state. Further, as shown in FIG. 1 (d), when it is wound around a certain object, it has a property of flattening while maintaining stretchability and deforming into a flat plate shape (flat deformation).

Accordingly, the wire diameter of the cord body 2 itself is indefinite because it changes according to the tensile stress, but the cord body 2 when a tensile stress (about 20 to 100 N) is applied along the length direction. The wire diameter (Φ) of itself is within a range of 0.5 to 10 mm (more preferably 1 to 5 mm), and the wire body 2 itself has a wire diameter (Φ ₀ ) is preferably 1 to 20 mm (more preferably 2 to 10 mm).

In addition, the width when the cord body 2 is deformed into a flat plate shape is preferably 0.75 to 15 mm (more preferably 1.5 to 7.5 mm).

The penetrating blade 3 is for piercing a living tissue existing around a bone to be bound, and for incising a passage for circling the cord body 2, and a blade 31 having a sharp tip end side; A curved body part 32 and a proximal end part 33 on the distal side are provided. The penetrating blade 3 is welded and fixed to the cord body 2 in a state where the base end portion 33 is inserted into one end side of the cord body 2, and at this time, one end side of the cord body 2. Is in a state where the wire diameter is contracted according to the outer diameter of the base end portion 33.

The buckle 4 is a flat metal plate material, and is fixed to the cord body 2 by welding. The buckle 4 is provided with two long holes 41 and 42 into which the cable body 2 can be inserted, and each of the long holes 41 and 42 has a saw blade that can mesh with the cable body 2. Shaped return portions 41a and 42a are provided. It is preferable that the buckle 4 is configured to have a thickness of 2 mm or less in a state where the buckle 4 is welded and fixed to the cord body 2 so that the buckle 4 does not cause a sense of foreign matter during bone fixation. .

Next, with reference to FIG. 2, a method of using the above-described cord 1 of the present invention will be described by taking as an example a binding operation of the sternum 5 cut during the thoracotomy.

In the thoracotomy, first, the chest is cut and opened in the longitudinal direction at the center of the sternum 5, and after necessary treatment, the cut sternum 5 is approached and temporarily closed.

Next, the penetrating blade 3 existing at one end of the cord 1 of the present invention is pierced between the ribs 51, and the cord body 2 following the penetrating blade 3 is inserted into the sternum 5 while incising the tissue existing around the sternum 5. Orbit around.

After the cord body 2 in the cord 1 of the present invention circulates around the sternum 5, the buckle 4 existing on the other end side of the cord body 2 is positioned at the center of the sternum 5, Is passed through the elongated hole 41 in the buckle 4 and the subsequent cord body 2 is inserted into the elongated hole 41 (FIG. 2B). )reference). When one end side of the cord body 2 is pulled in this state, the cord body 2 is pressed around the sternum 5 while being stretched to be flattened into a flat shape (see FIG. 2C). The cord body 2 that has been stretched and flattened into a flat plate shape is still stretchable, so that the cord body 2 is urged in a contracting direction. Since the net | network which comprises a surrounding wall is hooked in the said return part 41a provided, it is fixed in the state wound around the sternum 5.

After fixing the cord 1 of the present invention around the sternum 5 while maintaining an appropriate elastic force according to the bone density and age of the patient, the penetrating blade 3 is another part of the buckle 4. Passing through the elongated hole 42, the subsequent cord body 2 is inserted into the elongated hole 42. Thereafter, after confirming that the cord body 2 is not loosened, an excessive portion on one end side of the cord body 2 is cut to separate the penetrating blade 3 from the cord body 2 (FIG. 2 (a )reference).

The cord 1 of the present invention has a circular or oval striated shape while the cord body 2 expands and contracts in the length direction in response to the operator's pulling and the cross-sectional shape is contracted during hand movement. To prevent damage to the tissue around the bone more than necessary. Further, after the bones are bound, since the binding state can be maintained by the contraction force of the cord body 2, the cords of the present invention 1 are used when the bones are bound by a plurality of cords of the present invention 1. Even if there is a slight difference in the binding force in each of these, looseness and play do not occur, and a good binding state can be maintained.

Moreover, since the cord 1 of the present invention is deformed into a flat plate shape when wound around the bone, it is fixed in a state of surface contact with the outer peripheral surface of the bone. Therefore, it does not bite into the bone and does not give the patient a feeling of discomfort or tenderness after the operation.

Furthermore, since the cord 1 of the present invention is fixed to the bone by the contraction force of the cord body 2, even if a patient sneezes or crushes after the operation and an instantaneous force is applied, the cord is flexible. It can be expanded and contracted to reduce the risk of damaging bone.

The graph of FIG. 3 is a chart showing the expansion and contraction characteristics of the cord body 2 in the cord of the present invention 1 under the following test conditions, and the vertical axis indicates the tensile stress applied to the cord body 2. The horizontal axis indicates the tensile distance (stroke).

<Test>
Grasping the cable body 2 at a chuck distance of 200 mm, and measuring the tensile stress when the cable body 2 is stretched in the length direction at a tensile speed of 5 mm per minute (Testing machine: SHIMADZU AG-IS 50 kN ).

As shown in the graph of FIG. 3, when a tensile stress is applied along the length direction, the cord body 2 is stretched with almost no resistance in the initial stage of tension (stage (A) in the figure). . This stage is a stage in which the spiral radius of each of the basic lines 21 constituting the peripheral wall of the cord body 2 is reduced and the helical pitch is increased by tension, and the basic lines arranged in a spiral shape are formed. This is because the linear elastic force of 21 and the frictional force generated at the intersection of the basic lines 21 do not resist tensile stress. In the present invention, the stage (A) in this figure continues at least until the cord body 2 is pulled 2 mm (more preferably 2.5 mm), and the tensile stress required at that time is 15 N or less. (More preferably 10N or less). This numerical target is achieved mainly by appropriately selecting the number and diameter of the basic lines 21 constituting the peripheral wall of the cord body 2 and the spiral radius and spiral pitch of the basic lines 21 in a steady state. be able to.

If tensile stress is applied beyond the stage (A) in the figure, the elongation with respect to the tensile stress decreases, and the cord body 2 hardly expands even if the tensile stress increases ((B in the figure) ) Stage). This is because when the cord body 2 is pulled and the spiral radius of each of the basic lines 21 constituting the peripheral wall of the cord body 2 is reduced and the spiral pitch is increased, the adjacent basic lines 21 are This is because the proximity of the base line 21 is lost due to the approach and contact. At this time, the force against the tensile stress is mainly the sum of the tensile strengths of the basic lines 21. When the cord body 21 is released from the tensile stress at the stage (B) in the figure, the cross-sectional shape is somewhat reduced (the wire diameter is reduced), but the original state is almost restored. In the present invention, it is preferable that at least when the tensile stress is 100 N or less (more preferably, 200 N or less), it belongs to the stage (B) in this figure. This numerical target can be achieved by appropriately selecting the number, the wire diameter, the tensile strength, and the like of the basic wires 21 mainly constituting the peripheral wall of the cord body 2.

If a tensile stress is further applied beyond the stage (B) in the figure, unrecoverable elongation occurs in the basic line 21 constituting the cord body 2 (stage (c) in the figure). ) Eventually, the cord body 2 is disconnected (stage (D) in the figure), but the cord body 2 is not connected to the cord body 2 during actual binding work or in a state of being fixed to the bone. It is unlikely that the stage (C) or the stage (D) in the figure occurs.

That is, the cord 1 of the present invention has a stage of (A) in the figure that can be easily pulled and a stage of (B) in the figure that can restore the stretchability. Thus, a stable binding state can be achieved.

As a reference, the expansion and contraction characteristics of a conventional tying yarn (stainless steel belt-like flat plate type) measured under the same test conditions are shown in FIG. As shown in the chart of FIG. 4, it was recognized that the conventional tying yarn produced an unrecoverable stretch as soon as it was pulled in the length direction, and showed almost no stretchability.

<Embodiment 2>
FIG. 5 shows an outline of the overall configuration of the first rope body 11 of the present invention according to the second embodiment. The first cable body 11 of the present invention includes a cable body 2, a penetrating blade 3 provided on one end side of the cable body 2, a buckle 4 provided on the other end side of the cable body 2, It comprises.

The cord body 2 is of a parallel arrangement type in which a plurality (two in the present embodiment) of metal filaments (stainless steel filaments in the present embodiment) F are adjacent to each other along the length direction. A plurality of basic lines 21 composed of convergent lines (48 in the present embodiment) are braided so as to cross each other by cylindrical knitting (see an enlarged view of FIG. 5). The cord body 2 has the same configuration as that of the first embodiment except that a parallel arrangement type convergence line is used as the basic line 21.

The wire diameter of the metal filament F constituting the basic wire 21 is preferably 9 to 300 μm (more preferably 15 to 150 μm).

The penetrating blade 3 and the buckle 4 are the same as those used in the first embodiment, and are fixed to the cord body 2 by the same means as in the first embodiment.

Since the first cable body 11 of the present invention having such a configuration uses a parallel arrangement type converging line as the basic line 21, when it is wound around some object and deformed into a flat plate shape, a metal filament The sharpness of the edge portion is reduced as compared with the cord 1 of the present invention according to the first embodiment created using the basic line 21 made of a single wire.

This provides the advantage of less risk of damaging the bone and tissue surrounding the bone when it is wound around the bone.

By the way, the first cord 11 of the present invention created with the parallel arrangement type convergence line as the basic line 21 is wound around a certain object as the number of metal filaments F constituting the convergence line increases. It has been confirmed that the sharpness of the edge portion tends to be more relaxed when flattened into a flat plate shape.

However, since the metal filaments F constituting the convergence line have almost no stretchability, it is very difficult to bundle all the metal filaments F under the same conditions. In other words, a parallel arrangement type converging line in which a number of metallic filaments F are adjacent to each other is likely to be bent or the like in a part of the metallic filaments F constituting the converging line. The bent metal filament F is easily broken by itself, and the broken metal filament F becomes a cause of raising on the peripheral wall of the first cord body 1 of the present invention.

Therefore, in the present invention, when using a parallel arrangement type convergence line as the basic line 21, a parallel arrangement type convergence line in which two or three metal filaments F are adjacent to each other in the length direction is used. It is preferable to use it.

Since the remainder is the same as that described in the first embodiment, the description is omitted here to avoid repeated description.

<Embodiment 3>
FIG. 6A shows an outline of the overall configuration of the second cord 12 of the present invention according to the third embodiment. The second cord body 12 of the present invention includes a cord body 2, a penetrating blade 3 provided on one end side of the cord body 2, a buckle 4 provided on the other end side of the cord body 2, It comprises.

The cord body 2 is composed of a twisted wire-type converging wire formed by twisting a plurality of (seven in this embodiment) metal filaments (stainless steel filaments in this embodiment) F. A plurality of the basic lines 21 (48 in the present embodiment) are braided so as to cross each other by cylindrical knitting (see an enlarged view of FIG. 6A). The cord body 2 has the same configuration as that of the first embodiment except that a twisted-type converging wire is used as the basic wire 21.

The wire diameter of the metal filament F used for the basic wire 21 is preferably 3 to 150 μm (more preferably 9 to 100 μm).

The penetrating blade 3 and the buckle 4 are the same as those used in the first embodiment, and are fixed to the cord body 2 by the same means as in the first embodiment.

Since the second cord 12 of the present invention having such a configuration uses a twisted-type converging wire as the basic wire 21, when it is wound around some object and flattened into a flat plate shape, a metal filament The sharpness of the edge portion is reduced as compared with the cord 1 of the present invention according to the first embodiment created using the basic line 21 made of a single wire.

This provides the advantage of less risk of damaging the bone and tissue surrounding the bone when it is wound around the bone.

In addition, since the twisted wire type converging wire has a higher physical strength against tensile stress than a single-filament metal filament having the same wire diameter, the maximum value of the tensile stress at the stage (b) in FIG. There is also an advantage of higher.

In the present invention, the twisting method of the metal filament F constituting the basic wire 21 is not particularly limited. As a twisting method of the metal filament F constituting the basic wire 21, for example, a twisting method called Z twisting or a twisting method called S twisting can be suitably used.

In particular, in the present invention, when a stranded wire-type converging wire is used as the basic wire 21, a plurality of metal filaments are disposed around one metal filament FO as a core as shown in FIG. It is preferable to use a cored strand type converging wire formed by winding F.

This cored stranded wire type converging wire is compared with a stranded wire type converging wire without a core material because a single metal filament FO as a core material is arranged along the axis of the converging wire. Thus, there is an advantage that the physical strength against tensile stress is higher.

By the way, like the second cord body 12 of the present invention, when the cord body 2 is created by braiding a twisted-type converging wire as the basic wire 21 by tubular knitting, the peripheral wall of the cord body 2 is spirally formed. In the basic line 21 arranged at the center, a twist that twists around the virtual axis is generated. This twist causes the metal filament F constituting the basic wire 21 to be broken. Then, the broken metal filament F becomes a cause to cause a scissors on the peripheral wall of the cord 1 of the present invention.

Therefore, in the present invention, when creating the cord body 2 by braiding a twisted-wire-type converging line as the basic line 21 by tubular knitting, the basic line 21 is formed before the basic line 21 is braided. On the other hand, it is preferable to impart a twist that twists about the axis, and braid the basic line 21 in a direction in which the twist is unwound.

The number of twists applied in advance to the basic line 21 may be determined according to the number of times the basic line 21 is spirally wound during braiding.

The thus produced cord body 2 is not twisted in the basic line 21 constituting the peripheral wall, and the risk of the metal filament F constituting the basic line 21 is reduced.

Since the remainder is the same as that described in the first embodiment, the description is omitted here to avoid repeated description.

Note that the present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

The cord of the present invention is used for bundling vertically fractured bones, and particularly suitable for bundling sternum cut in thoracotomy.

1 Present invention cord (bone binding cord)
11 First cord body of the present invention (bone binding cord)
12 The second cord of the present invention (the cord for bundling)
2 Cord body 21 Basic line 3 Penetrating blade 31 Blade 32 Body portion 33 Base end portion 4 Buckle 41 Long hole 42 Long hole 5 Sternal bone 51 Rib F Metal filament F0 Metal filament (core material)

Claims (11)

A bundling cord used for bundling longitudinally fractured bones,
A single wire of a metal filament, or a basic wire composed of a convergent wire of a metal filament, comprising a plurality of cord bodies that are braided in a state of crossing each other,
When operating the hand, the cord body expands and contracts in the length direction while maintaining a circular or elliptical cross-sectional shape, and when the bone is bound, it flattenes into a flat plate shape, so that it faces the surface of the bone. So that you can contact
The cord body is formed as a hollow braided body having a net-like peripheral wall formed by connecting the basic lines, and each of the basic lines constituting the peripheral wall is spirally arranged along the peripheral wall. A bone uniting cord body characterized by being made. In the bone binding cord according to claim 1,
The bone binding cord, wherein the basic line is a parallel arrangement type converging line in which a plurality of metal filaments are adjacent to each other along the length direction. The cord for binding bone according to claim 2,
A bone binding rope in which the basic line is a converging line of a parallel arrangement type in which two or three metal filaments are adjacent to each other along the length direction. The cord for binding bone according to claim 2 or 3,
A bone binding cord having a wire diameter of 9 to 300 μm. In the bone binding cord according to claim 1,
A bone binding rope in which the basic wire is a twisted-type convergent wire formed by twisting a plurality of metal filaments. The cord for binding bone according to claim 5,
A bone binding cord in which the basic wire is a cored strand type converging wire formed by winding a plurality of metal filaments around one metal filament as a core material. The bone binding cord according to claim 5 or 6,
A bone binding cord having a wire diameter of 3 to 150 μm. In the bone unity rope according to any one of claims 5 to 7,
The bone binding cord having no twist that twists around the virtual axis of the basic line. The bone unity rope according to any one of claims 1 to 8,
A bone binding rope having a tensile stress of 15 N or less required to pull at least 2 mm when the cord body is pulled under the following test conditions.
<Test>
The cord body is held at a chuck distance of 200 mm, and the tensile stress is measured while pulling the cord body in the length direction at a tensile speed of 5 mm per minute. In the bone unity cord according to claim 9,
When the cord body is pulled according to the test conditions, if the tensile stress is 100 N or less, then the cord for cord binding that recovers stretchability when the test force is not applied. It is a manufacturing method of the rope for bone unity according to claim 8,
Prior to braiding the basic line, the basic line is imparted with a twist that twists about an axis, and the basic line is braided in a direction in which the twist is unwound. A manufacturing method of a cord.

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