JP5291041B2 - Spacer fixing thread and spacer with spacer fixing thread - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread for fixing a spacer with which operation for fixing the spacer to the bone can be performed easily and reliably, and which does not adversely affect a living body, and to provide a spacer with the thread for fixing the spacer, which includes the thread for fixing a spacer and facilitates operation of securing a gap between the bones. <P>SOLUTION: The thread for fixing a spacer is used for fixing the spacer to the bone while the spacer is inserted in the gap between the bones. The thread for fixing a spacer is characterized in that at least one of end parts of the thread is provided with a hardened part formed by welding a reinforcement member. The spacer with the thread for fixing the spacer is inserted in the gap between the bones and has a through hole through which the thread for fixing the spacer is inserted. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a spacer fixing thread used when fixing a spacer to a bone, and a spacer provided with the spacer fixing thread.

  As a treatment for cervical spondylotic myelopathy, posterior longitudinal ligament ossification, yellow ligament ossification, intervertebral disc herniation and the like, a median longitudinal split cervical vertebral laminoplasty is performed.

  In midline longitudinal split laminoplasty, the midline (center) of the vertebral arch or spinous process is cut, and the vertebral arches on both sides are opened like hinges with the midline as the boundary. To enlarge. At this time, a spacer is inserted into a gap opened by cutting a vertebral arch or spinous process.

  For example, a spacer having a substantially trapezoidal shape in plan view is used by being inserted into the gap such that the narrow portion is on the spinal canal (vertebral foramen) side.

  In order to prevent the spacer from detaching from the vertebral arch or spinous process, a suture thread is inserted into the through-hole formed in the vertebral arch or spinous process and the through-hole formed in the spacer, and the spacer is tightened. (See, for example, JP 2007-082826 (Patent Document 1)). The spacer is usually fixed by using a plurality of sutures, but the operation of inserting these sutures through the through holes is extremely complicated, and improvement is desired.

“Orthopedic Surgical Cruz (2nd revised edition)”, Nanedo Co., Ltd., June 1, 2006, page 139 (Non-patent Document 1) includes a thread for fixing the spacer in cervical laminoplasty. It is described that both ends of a thread are fixed with medical Aron Alpha (registered trademark) or bone wax when passing through a through hole provided in a spacer in advance. However, although Aron Alpha (registered trademark) or bone wax for medical use has relatively little adverse effect on the living body, improvement is desired from the viewpoint of reducing the risk as much as possible.

JP 2007-082826

“Orthopedic Surgical Cruz (2nd revised edition)”, Nanedo Co., Ltd., June 1, 2006, p. 139

  An object of the present invention is to provide a spacer fixing thread that can easily and reliably perform the operation of fixing the spacer to the bone and that does not adversely affect the living body, and a gap between the bones including the spacer fixing thread. An object of the present invention is to provide a spacer with a spacer fixing thread that can be easily secured.

  As a result of diligent research in view of the above-mentioned object, the present inventors can easily insert the through hole provided in the bone and the spacer by forming a hardened portion hardened by welding at at least one end of the suture. The present inventors have found that a suture that can be performed and that does not adversely affect a living body is obtained, and as a result, an operation of fixing a spacer and securing a gap between bones can be easily performed and the present invention has been conceived.

  That is, the spacer fixing thread of the present invention is used to fix the spacer to the bone in a state where the spacer is inserted into the gap between the bones, and a reinforcing member is welded to at least one end of the thread. It has the hardened | cured part formed.

  The reinforcing member is preferably another yarn different from the yarn.

  Another spacer fixing thread according to the present invention is used to fix the spacer to the bone in a state where the spacer is inserted into a gap between bones, and the thread is attached to at least one end of the thread. It has the hardening part formed by welding the part which yarns overlap by folding back.

  Still another spacer fixing thread according to the present invention is used to fix the spacer to the bone in a state in which the spacer is inserted in the gap between the bones, the thread is a multifilament thread, It has a hardened part formed by welding monofilament yarns constituting the multifilament yarn to at least one end.

  The welding is preferably performed at a temperature equal to or higher than the softening temperature of the material constituting the yarn.

A spacer with a thread for fixing a spacer of the present invention is a spacer having a through hole inserted into a gap between bones, wherein the spacer fixing thread is inserted into the through hole.

Preferably, the spacer fixing thread-attached spacer has two or more spacer fixing threads. The ends of the two or more yarns may be joined to each other, and the ends of the two or more yarns may be independent of each other.

Preferably, the spacer is for cutting the vertebral arch or the vertebral arch and spinous process and inserting it into the open gap.

Since the spacer fixing thread of the present invention has a cured portion cured by welding at at least one end, it can be easily inserted into the spacer and the through-hole formed in the own bone, and the adhesive component Because it does not contain, there is no risk to living bodies.

The spacer with thread for fixing a spacer according to the present invention can reduce the burden on the operator because the thread has passed through the spacer in advance, and has a hardened portion cured by welding at at least one end of the thread. Can be easily inserted into a through-hole formed in the own bone.

It is a schematic diagram which shows the example of the thread | yarn for spacer fixation of this invention. It is a schematic diagram for demonstrating a median longitudinal split-type expansion laminoplasty. It is another schematic diagram for demonstrating a median longitudinal split-type expansion laminoplasty. FIG. 10 is still another schematic diagram for explaining a median longitudinal split-type laminoplasty. FIG. 10 is still another schematic diagram for explaining a median longitudinal split-type laminoplasty. It is a schematic diagram for demonstrating the method to fix a spacer. It is a schematic diagram which shows the other example of the thread | yarn for spacer fixation of this invention. It is a perspective view which shows an example of the spacer with the thread | yarn for spacer fixation of this invention. It is a schematic diagram which shows the edge part of the spacer fixing thread | yarn of this invention. It is a schematic diagram explaining the method for forming the hardening part of the thread for spacer fixation of this invention.

[1] Median longitudinal split-type laminoplasty The spacer fixing thread and the spacer-attached spacer with the spacer fixing thread of the present invention are used, for example, in a median vertical split-type laminoplasty. The median longitudinal split laminoplasty will be described with reference to FIGS. 2 to 5, the upper side is the back side, and the lower side is the ventral side.

  As shown in FIG. 2, the vertebra 100 includes a vertebral body 110, a vertebral arch 120 that extends behind the vertebral body 110 (upper side in FIG. 2) and forms a spinal canal (vertebral foramen) 140, And a spinous process 130 protruding backward from the central portion.

  First, as shown in FIG. 3, the spinous process 130 is cut along the midline 200 using an air drill or the like, and the vertebral arch 120 is divided into two to form the cut portions 130a and 130b. Further, grooves 121a and 121b are formed on the outer side of the root portion of the vertebral arch 120 using an air drill or the like. The grooves 121a and 121b have a depth enough to cut only the outer plate and not the inner plate. The portions where the grooves 121a and 121b are formed are hinge portions (hinges) 122a and 122b.

  Next, as shown in FIG. 4, the cut portions 130a and 130b are rotated about the hinge portions 122a and 122b, so that the cut portion of the spinous process 130 is expanded and a gap 150 is formed. Here, the inner side surface facing the gap 150 between the cutting portions 130a and 130b is shaped as necessary.

  Next, through holes 131a and 131b are formed in the cutting portions 130a and 130b. Thereafter, as shown in FIG. 5, a substantially trapezoidal spacer S is inserted into the gap 150 in plan view. Thus, an enlarged vertebral arch 160 is formed by the spinous process 130 of the patient and the spacer S.

  During or after the operation, two spacer fixing threads 1 of the present invention are inserted into the through holes 131a and 131b of the spinous process 130 and the through hole S1 of the spacer S. Then, as will be described later, the spacer S is fixed to the cutting portions 130a and 130b using the first yarn 10a of the spacer fixing yarn 1 and another yarn 11a used as a reinforcing member.

  As the spacer S, those composed of bioceramics such as alumina, zirconia, calcium phosphate compound, etc. are preferably used. A porosity of 70% or less (particularly 30 to 50%) is suitable.

[2] Spacer fixing thread The spacer fixing thread of the present invention is used to fix the spacer to the bone in a state where the spacer is inserted into a gap between bones, and at least one of the threads It has the hardening part in the edge part, It is characterized by the above-mentioned. The hardened portion may be formed by welding a reinforcing member (first embodiment), or formed by folding the yarn and fusing the yarns of the folded portion (second embodiment). In addition, a multifilament yarn may be used as the yarn, and the monofilament yarns constituting the multifilament yarn may be fused together (third embodiment). As the reinforcing member, a yarn other than the yarn, a tube-like member (heat-shrinkable tube, tube-like strand, etc.), a thermoplastic sheet, or the like can be used.

(1) First embodiment
(a) When another yarn is fused as a reinforcing member As shown in FIG. 1 (a), the spacer fixing yarn 1 is composed of one yarn 10 having a diameter D and at least one end of the yarn 10. And a cured portion 11 formed by welding a yarn 11a different from the yarn 10 having a length L, formed on the portion. The spacer fixing yarn 1 shown in FIG. 1 (a) is an example having a hardened portion 11 formed by welding different yarns 11a to both ends thereof.

(i) Curing Part The curing part 11 is preferably formed into a shape as shown in FIG. 9 (a) or FIG. 9 (b), for example. When molded into the shape shown in FIG. 9 (a), since the diameter of the cured portion 11 becomes substantially uniform, the bending strength of the cured portion 11 with respect to the joint surface direction x between the yarn 10 and another yarn 11a, It is more preferable because the bending strength of the hardened portion 11 with respect to the direction y perpendicular to this can be made substantially equal.

  The hardened portion 11 formed at the end of the spacer fixing yarn 1 is formed by joining two yarns 10 and 11a, so that it is more rigid (bending strength) than the portion of the yarn 10 where the hardened portion 11 is not formed. )Is high. For this reason, the operation of inserting the spacer fixing thread 1 through the through holes 131a, 131b and S1 can be easily performed.

  Further, in the example shown in FIG. 1 (a), since the hardening portions 11 are provided at both ends of the spacer fixing yarn 1, when inserting the spacer fixing yarn 1 into the through holes 131a, 131b and S1, The insertion operation can be performed from either end side.

<Bending strength>
The bending strength in the longitudinal direction of the hardened portion 11 only needs to be strong enough to allow the spacer fixing thread 1 to be inserted into the through holes 131a and 131b and the through hole S1 of the spacer S. It is preferably about 0.5 to 3.5 N, more preferably about 1 to 2.5 N, and most preferably about 1 to 2 N. If the bending strength of the hardened part 11 is set in the above range, the hardened part 11 has sufficiently high rigidity. For this reason, the said insertion operation can be performed more reliably and easily.

  The bending strength is measured by cutting the hardened part 11 to a predetermined length and setting it on a strength measuring machine (Shimadzu Corporation "EZ-Test") so that a part (about 10 mm) protrudes. This is done by pressing the protruding part almost perpendicularly to the base at 5 mm / min, and evaluating with the maximum strength until bending.

  In addition, the bending strength in the longitudinal direction of each of the yarns 10 measured by the same method, that is, the bending strength of the portion where the hardened portion 11 is not formed is preferably about 0.02 to 0.1 N, and about 0.025 to 0.09 N. More preferably. Since the yarn 10 having such bending strength is relatively high in flexibility, it is easy to perform an operation of fixing the spacer S to the cut portions (bones) 130a and 130b of the spinous process 130.

<Length>
The length L of each cured portion 11 is not particularly limited, but is preferably about 1 to 3.5 cm, and more preferably about 1.5 to 2.5 cm. By setting the length of the hardened portion 11 within the above range, the hardened portion 11 can be reliably held with a finger or the like. In addition, within the above range, the length of the cured portion 11 is not too long, and the insertion operation of the spacer fixing thread 1 into the through holes 131a and 131b and the through hole S1 can be easily performed.

(ii) Thread <Material>
The yarn 10 is not particularly limited, but is preferably mainly made of a polymer material. The yarn is preferably made of a material having biocompatibility.

  Polymer materials include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA) and other polyolefins, cyclic polyolefins, modified polyolefins, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide Polyamideimide, polycarbonate, poly- (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer (AS resin) , Butadiene-styrene copolymer, polyoxymethylene, polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexane terephthalate (PCT), etc. Polyester, polyether, polyetherketone (PEK), polyetheretherketone (PEEK), polyetherimide, polyacetal (POM), polyphenylene oxide, modified polyphenylene oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, fragrance Group polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, fluororesin, and the like, and these may be used in combination.

  Among these, polyester is preferable. By using polyester, relatively high flexibility can be imparted to the yarn 10, and the operation of fixing the spacer S is facilitated.

<Shape>
The surface of the thread 10 may be subjected to a surface treatment for making it difficult to slip when the spacer fixing thread 1 is gripped with a finger or the like. Examples of the surface treatment include coating with a silicone resin.

  The yarn 10 may be composed of monofilament yarn or multifilament yarn. Here, the monofilament yarn refers to a single fiber that does not have a long continuous connection portion, and the multifilament yarn refers to a single fiber that is formed by twisting a plurality of monofilaments together. Say that.

  When monofilament yarn is used, there is an advantage that the waist of the yarn 10 becomes strong and the spacer S can be tightened (fixed) more firmly. On the other hand, when the multifilament yarn is used, there is an advantage that the flexibility of the yarn 10 is enhanced and the spacer S can be tightened more easily and accurately.

<Length>
Although the length of the thread | yarn 10 is not specifically limited, It is preferable that it is about 30-100 cm, and it is more preferable that it is about 50-80 cm.

<Thickness>
The diameter D of the yarn 10 is not particularly limited, but is preferably about 0.05 to 1.0 mm, and more preferably 0.2 to 0.8 mm. It is preferable that the yarn 10 and another yarn 11b used as the reinforcing member have substantially the same diameter.

(iii) Another Yarn Another yarn 11a used as the reinforcing member may be the same type of yarn as the yarn 10 or may be another type of yarn. In the case of another type of yarn, it can be freely selected and combined depending on the purpose, such as a difference in thickness, a difference between a multifilament yarn and a monofilament yarn, a difference in material, and the like. FIG. 1 (a) shows the case where there is one other thread 11a used as the reinforcing member, but there may be two or more other threads 11a.

  As shown in an enlarged view of the end portion in FIG. 7, by shifting the end surfaces of another yarn 11a used as a reinforcing member and the yarn 10, the other yarn 11a protrudes from the cured portion 11, The hardened portion 11 may be formed by fusing so that the protruding portion 12 having the length L1 of only another yarn 11a exists at one end portion.

  The spacer fixing thread 1 having the cured portion 11 formed in this manner has a protruding portion 12 (consisting of another thread 11a used as a reinforcing member) that is thinner than the diameter of the cured portion 11. The operation of inserting the through holes 131a, 131b and S1 becomes easier.

  The length L1 of the protrusion 12 is not particularly limited, but is preferably about 0.5 to 1 cm. When the yarn of the protruding portion 12 is a multifilament yarn, the protruding portion 12 is preferably cured by heating.

  FIG. 7 shows a cured portion 11 formed by fusing so that another yarn 11a protrudes from the cured portion 11 and a protruding portion 12 having a length L1 of only another yarn 11a is present at one end thereof. However, on the contrary, the cured portion 11 may be formed by fusing so that the yarn 10 protrudes from the cured portion 11 and the protruding portion 12 having the length L1 of only the yarn 10 exists at one end thereof. .

(iv) Forming method of cured portion Examples of a method for fusing the yarn 10 and another yarn 11a used as a reinforcing member include thermal fusion, ultrasonic fusion, and high-frequency fusion. Is most preferred. The heat fusion does not require expensive equipment, and can easily and reliably join the yarn 10 and another yarn 11a to form the cured portion 11. When the method using heat fusion is used, since the component constituting the suture is substantially only the component of the yarn, the possibility of foreign matter entering the body can be reduced.

  The fusing temperature is preferably not less than the softening temperature of the yarn to be used and about the melting temperature. When fused at a temperature lower than the softening temperature, the adhesive strength is insufficient. Fusing may be performed at a temperature higher than the melting temperature, but it is necessary to cool below the softening temperature while maintaining the shape of the cured portion. Lower is better. In particular, (softening temperature + 5 ° C.) to (melting temperature−5 ° C.) is preferable. For example, when the yarn material is polyester, the treatment temperature is preferably about 245 ° C to 255 ° C. The fusing time can be determined in a timely manner in order to obtain a desired bonding strength, but is preferably about 0.1 to 1 second, more preferably about 0.2 to 0.5 second, 0.2 Most preferably, it is about 2 to 0.4 seconds.

  The heat fusion between the yarn 10 and another yarn 11b can be performed using a film sealer or the like.For example, the yarns can be heat-sealed using a jig as shown in FIG. Thus, the fusion area between adjacent yarns can be adjusted to be constant, and a hardened portion having a constant strength can be formed. The fusion area can be freely set by adjusting the width w and depth d of the mold of the jig.

  When fusing yarns together using a jig as shown in FIG. 10 (a), the yarn is held for a certain period of time with the two yarns sandwiched by the jig, It is preferable to leave it fixed and take it out until it becomes a temperature sufficiently lower than the softening temperature. If the yarn is taken out at a temperature higher than the softening temperature of the yarn, it may be peeled off or deformed such as warping.

  Adhesion between adjacent yarns does not necessarily have to hold the round shape of the yarn, for example, it may be formed into a square shape using a jig as shown in FIG. As shown in (a), the cross section of the hardened portion 11 may be formed in a substantially circular shape. Further, when forming a hardened portion using two or more different yarns used as reinforcing members, the width w of the jig mold shown in FIG. 10 (a) or FIG. 10 (b) is expanded or deepened. The cured portion can be formed by increasing the depth d so that three or more yarns can be fused at a time.

(b) When a tube is fused as a reinforcing member As shown in FIG. 1 (b), a spacer fixing thread 1 has one thread 10 having a diameter D and at least one end of the thread 10. The hardened portion 11 is formed by welding the tube 11b to the yarn 10 in a state where the formed tube 11b having a length L is covered. A spacer fixing thread 1 shown in FIG. 1 (b) is an example having a cured portion 11 formed by fusing a tube 11b to both ends thereof.

  The tube used as the reinforcing member is preferably a heat-shrinkable tube. By using a heat-shrinkable tube, the cured portion 11 can be easily formed on at least one end of the spacer fixing yarn 1. Further, as the tube, a yarn knitted in a tube shape may be used, or a thermoplastic sheet or the like may be wound into a tube shape.

  The bending strength, length L, and material, shape, length, action, and effect of the cured portion 11 are different from the reinforcing member even when the cured portion 11 is formed by fusing a tube as the reinforcing member. This is the same as the case where the cured portion 11 is formed by fusing the yarn.

(2) Second embodiment As shown in FIG. 1 (c), the spacer fixing thread 1 is a long thread formed on one thread 10 having a diameter D and at least one end of the thread 10. It comprises a hardened portion 11 formed by welding the overlapping portions of the yarns folded back at a length L. A spacer fixing thread 1 shown in FIG. 1 (c) is an example having the hardened portions 11 at both ends thereof.

  The cured portion 11 can be formed in the same manner as when another yarn is fused as a reinforcing member in the first embodiment. That is, it is formed by fusing the portion where the yarns of the yarn folded back with the length L overlap with each other by the method described above.

  The bending strength, length L, and material, shape, length, action, and effect of the cured portion 11 are the same as in the second embodiment. This is the same as the case of forming 11.

(3) Third Embodiment As shown in FIG. 1 (d), the spacer fixing yarn 1 is formed on one multifilament yarn 10 having a diameter D and at least one end of the yarn 10. And a cured portion 11 formed by welding monofilament yarns constituting the multifilament yarn. A spacer fixing thread 1 shown in FIG. 1 (d) is an example having the hardened portions 11 at both ends thereof.

  The monofilament yarns constituting the multifilament yarn are welded together by heat fusion using a known film sealer or the like. The conditions for heat sealing are the same as in the first embodiment.

  The length L of the cured portion 11, the material, shape, length, action, and effect of the yarn 10 are formed in the third embodiment by fusing another yarn as the reinforcing member to form the cured portion 11. It is almost the same as the case. The bending strength of the hardened portion 11 is slightly inferior to that of the first and second embodiments, but it is advantageous in that the fixing yarn of the third embodiment using multifilament yarn can be easily manufactured.

(4) Example of Use of Spacer Fixing Yarn A method of fixing the spacer S to the cutting portions 130a and 130b of the spinous process 130 using the spacer fixing thread 1 will be described with reference to FIG. FIG. 6 shows a stage between FIG. 4 and FIG. 5 for explaining the median longitudinal split-type laminoplasty.

(i) Hold one cured portion 11 of the spacer fixing thread 1 with a finger or the like and insert it into the through hole S1 of the spacer S (not shown). This operation is performed on the two spacer fixing threads 1 and 1, and one of the spacer fixing threads 1 and 1 is inserted with the two spacer fixing threads 1 and 1 inserted into the through holes S1 of the spacer S. The cured portions 11 and 11 are inserted into a through hole 131a formed in the cut portion 130a, and the other cured portions 11 and 11 are inserted into a through hole 131b formed in the cut portion 130b (see FIG. 6A).

  In order to prevent the ends of the different yarns 10 from being tied together when the spacer is fixed after separating the cured portion 11, the two spacer fixing yarns 1, 1 are colored in different colors. It is preferable.

  At this time, since the hardened portion 11 has the high bending strength as described above, it can be reliably gripped and is not easily bent when inserted through the through holes 131a, 131b, and S1, and this operation is surely performed. Can do.

(ii) Pull both ends of the two spacer fixing threads 1 and 1 in the direction of separating, and insert the spacer S into the gap 150 (see FIG. 6B).

(iii) The two spacer fixing threads 1 and 1 are tied together so that the spacer S is tightened. Thereby, the spacer S can be fixed to the cutting parts 130a and 130b.

(iv) The unnecessary portions of the two spacer fixing threads 1 and 1 are cut to complete the median longitudinal split-type laminoplasty (see FIG. 6 (c)).

  In this embodiment, the hardened portions 11 are provided at both ends of the spacer fixing yarn 1, but it is easy to operate to insert the spacer fixing yarn 1 into the through holes 131a, 131b and S1. In consideration of only this, the hardening portion 11 may be provided only at one end of the spacer fixing yarn 1.

[3] Spacer with spacer fixing thread As shown in FIG. 8, the spacer fixing thread 1S has a spacer fixing thread as described in the first to third embodiments. 1 is inserted through the through hole. It is preferable that there are two spacer fixing threads 1 inserted through the through holes.

  Depending on the purpose, the spacer fixing thread 1 may be composed of three or more threads. In this case, for example, when the spacer is fixed to the bone with two threads, and the remaining thread is used to fix the separated spinous process in its original position when the spinous process is separated from the vertebral arch. When the ligament is separated from the spinous process, the separated ligament can be used for fixing to the spinous process.

  The spacer fixing thread 1 is provided to the operator in a state of being inserted through the through hole S1 of the spacer S, for example. The spacer fixing thread 1 may be fixed to the spacer S using a biocompatible material or the like.

  By using the spacer with the spacer fixing thread, the operation of inserting the spacer fixing thread 1 into the through hole S1 of the spacer S can be omitted at the operation site, so that the operation time can be shortened. The burden on the patient and patient.

  As mentioned above, although the spacer fixing thread and the spacer with spacer fixing thread according to the present invention have been described based on the illustrated embodiments, the present invention is not limited to these embodiments, and each configuration is the same. It can be replaced with any one that can function, or can be added with any configuration.

  The spacer shown in the above embodiment is a spacer used for a gap between bones formed by cutting a vertebra and a spinous process, that is, a spinous process spacer, but is formed by cutting a vertebra. It may be a spacer used for the gap between the bones, that is, a larch spacer. Furthermore, the spacer may be an intervertebral spacer used between vertebral bodies.

1 ... Spacer fixing thread
10 ... Thread
11 ・ ・ ・ Curing part
11a-another thread
11b ... Tube
12 ... Projection
1S ・ ・ ・ Spacer with spacer fixing thread
S ・ ・ ・ Spacer
S1 ... through hole
100 ... vertebra
110 ... vertebral body
120 ...
121a, 121b ... groove
122a, 122b ・ ・ ・ Hinges
130 ・ ・ ・ Spinous process
130a, 130b ... cutting part
131a, 131b ... through hole
140 ... spinal canal
150 ... Gap
160 ... enlarged arch
200: Midline

Claims (8)

A spacer fixing thread used to fix the spacer to the bone with a spacer inserted in a gap between bones, wherein a reinforcing member is welded to at least one end of the first thread. curing unit have a made, a spacer fixing yarn, wherein the reinforcing member is different from the first yarn, which is another thread of the same length as the curing unit.   A spacer fixing thread used to fix the spacer to the bone in a state where the spacer is inserted in the gap between the bones, and the threads are folded by folding the thread at at least one end of the thread. A spacer fixing thread characterized by having a hardened portion formed by welding the overlapping portions.   A spacer fixing thread used to fix the spacer to the bone with a spacer inserted in a gap between bones, wherein a reinforcing member is welded to at least one end of the first thread. And the reinforcing member is another yarn longer than the cured portion, different from the first yarn, and a portion longer than the cured portion of the other yarn is longer than the cured portion. A spacer-fixing thread characterized in that it protrudes to form a projecting portion made of only the other thread.   A spacer fixing thread used to fix the spacer to the bone with a spacer inserted in a gap between bones, wherein a reinforcing member is welded to at least one end of the first thread. And the reinforcing member is another thread having the same length as the cured part, the first thread protruding from the cured part and the first thread. A spacer-fixing thread, characterized in that a protrusion made only of the thread is formed.   The spacer fixing yarn according to any one of claims 1 to 4, wherein the welding is performed at a temperature equal to or higher than a softening temperature of a material constituting the yarn.   A spacer having a through hole inserted into a gap between bones, wherein the spacer fixing thread according to any one of claims 1 to 5 is inserted into the through hole. Spacer with thread.   7. A spacer with a thread for fixing a spacer according to claim 6, wherein the spacer has a thread for fixing the spacer. The spacer with a thread for fixing a spacer according to any one of claims 6 to 7, wherein the spacer is for cutting a vertebral arch or a vertebral arch and a spinous process and inserting it into an open gap. Spacer with thread for fixing the spacer.

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