JP2012024253A - Collagen film and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collagen film having stretchability so that it can follow the movement of an organ and the like.SOLUTION: The collagen film 10 comprises a first layer 11 having a plurality of collagen fibers 20 disposed along a first direction 21, and a second layer 12 having a plurality of collagen fibers 20 disposed along a second direction 22, the first layer 11 and the second layer 12 being stacked and bonded to each other. The collagen film 10 includes a first heat treatment area 31 in the form of a strip extending along a third direction 23 and a second heat treatment area 32 in the form of a strip extending along a fourth direction 24. Since the collagen film 10 has stretchability so that it can follow the movement of an organ and the like, the movement of an organ that repeats expansion and contraction, such as the stomach, the intestines, the heart or the lung, will not be hindered, and the collagen film 10 will not be ruptured.

Description

  The present invention relates to a collagen membrane in which collagen threads are laminated and a method for producing the collagen membrane.

  2. Description of the Related Art A medical base material using collagen as a material is known as a material used for surgical treatment or treatment of trauma. One of the medical base materials is a collagen membrane. The collagen membrane is formed by arranging a plurality of collagen yarns spun by a wet spinning method in a predetermined direction to form one layer, and another layer in which the collagen yarns are arranged in a direction different from that direction. Are laminated and the layers are bonded to each other (Patent Documents 1 and 2).

JP 2003-301362 A JP 2004-148014 A

  The collagen membrane described above is used as, for example, a medical base material that a tissue regenerates. The collagen membrane is stored in a dry state, and in use, is immersed in physiological saline to be in a wet state having flexibility. Since the collagen membrane has flexibility, it can be fixed to tissues of various shapes.

  However, there is a problem that the collagen membrane lacks stretchability. For example, in an organ that repeatedly expands and contracts, such as the stomach, intestine, heart, and lung, it is desirable that the fixed collagen film expands and contracts following the movement of the organ. If the collagen membrane is not sufficiently expanded or contracted with respect to the movement of the organ, there is a problem that the movement of the organ is hindered or the collagen membrane is broken.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a collagen membrane having elasticity that can follow the movement of an organ or the like.

  The collagen membrane according to the present invention includes at least a first layer in which a plurality of collagen threads are arranged along a first direction, and a plurality of collagen threads arranged in a second direction different from the first direction. A collagen film in which the second layer is laminated and the first layer and the second layer are bonded to each other, and partially includes a first heat treatment region.

  Since the first heat treatment region is excellent in stretchability, the stretchability of the collagen film is improved.

  The first heat treatment region may be in a belt shape along at least the third direction.

  This improves the stretchability of the film in at least the third direction.

  A plurality of the first heat treatment regions may be provided at a predetermined interval. Thereby, the stretchability of the film with respect to the third direction is further improved.

  The collagen membrane may have a strip-shaped second heat treatment region along a fourth direction intersecting with the third direction. Thereby, the elasticity of the film with respect to the fourth direction is improved.

  A plurality of the second heat treatment regions may be provided at a predetermined interval. Thereby, the stretchability of the film with respect to the fourth direction is further improved.

  The collagen membrane may have a hole penetrating in the thickness direction. Thereby, the stretchability of the film is further improved.

  The hole may be provided in a region other than the first heat treatment region and in a region other than the second heat treatment region when the second heat treatment region is included. Thereby, the improvement of the elasticity of the film | membrane by a 1st heat processing area | region or the 2nd heat processing area | region and the improvement of the elasticity of the film | membrane by a hole can be made to make compatible.

  In the present invention, at least a first layer in which a plurality of collagen threads are arranged along a first direction, and a second layer in which the plurality of collagen threads are arranged along a second direction different from the first direction. A first step in which the first layer and the second layer are bonded to each other to form a thin film, and the film is partially heated to form a heat treatment region. And a method for producing a collagen membrane comprising steps.

  The method for producing the collagen membrane may further include a third step of forming a hole penetrating the membrane in the thickness direction.

  According to the present invention, the collagen membrane has elasticity that can follow the movement of the organ and the like, so that the movement of the organ is inhibited in an organ that repeatedly expands and contracts, such as the stomach, intestine, heart, and lung. And the collagen membrane does not break.

FIG. 1 is a schematic diagram showing a collagen membrane 10 according to an embodiment of the present invention. FIG. 2 is an exploded schematic view showing the structure of the collagen membrane 10. FIG. 3 is a schematic diagram showing the collagen membrane 10 that does not have the holes 33 according to a modification of the present invention. FIG. 4 is a schematic diagram showing a collagen membrane 10 having a partial heat treatment region 34 according to a modification of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. Each embodiment described below is only an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention.

  As shown in FIGS. 1 and 2, the collagen membrane 10 includes a first layer 11 in which a plurality of collagen threads 20 are arranged along a first direction 21, and a plurality of collagen threads 20 in a second direction 22. And the second layer 12 arranged along the first and second layers 12 are laminated and the first layer 11 and the second layer 12 are bonded to each other. The outer shape of the collagen membrane 10 is generally rectangular.

  The collagen yarn 20 is spun using solubilized collagen as a spinning dope. Examples of the method for spinning the collagen yarn 20 from the solubilized collagen solution include the methods described in Patent Documents 1 and 2 described above, JP-A-6-228505, and JP-A-6-228506. It is done.

  The origin of collagen is not particularly limited, but generally examples include cattle, pigs, birds, fish, rabbits, sheep, mice, and humans. Collagen is obtained from the skin, tendon, bone, cartilage, organ, etc. of these animal species by a known extraction method. Further, the type of collagen is not limited to any of the types that can be classified, such as type I, type II, and type III, but type I is preferable from the viewpoint of handling.

  Solubilized collagen is collagen that has been treated so that the solvent can be dissolved. For example, heat-solubilized collagen, acid-solubilized collagen, alkali-solubilized collagen, enzyme-solubilized collagen, neutral solubilized collagen Collagen is mentioned. In particular, atelocollagen that has been subjected to a treatment for removing telopeptide, which is an antigenic determinant of collagen, along with the solubilization treatment is preferable. Solvents for solubilizing collagen are not particularly limited, but typical examples include dilute acid solutions such as hydrochloric acid, acetic acid, and nitric acid, hydrophilic organic solvents such as ethanol, methanol, and acetone, water, a mixture thereof, water, and the like. Is mentioned. Examples of the method for solubilizing collagen include the methods described in JP-B No. 46-15003, JP-B No. 43-259839, and JP-B No. 43-27513.

  The collagen film 10 is formed by laminating the first layer 11 and the second layer 12 so that the arrangement directions of the collagen threads 20 (first direction 21 and second direction 22) form a predetermined angle. Yes. The predetermined angle is an arbitrary angle other than 0 °, but the acute angle is preferably 20 ° or less, more preferably 10 ° or less, or 70 to 90 °, more preferably 80 to 90 °. 90 °. That the first layer 11 and the second layer 12 are laminated means that the collagen thread 20 constituting the first layer 11 and the collagen thread 20 constituting the second layer 12 are in contact with each other at the boundary. The state that is.

  In the present embodiment, the collagen film 10 is formed by laminating the first layer 11 and the second layer 12, but the third layer is composed of a plurality of collagen threads 20 arranged in a predetermined direction. A fourth layer or the like may be further laminated. In the collagen film 10 in which the third layer, the fourth layer, and the like are laminated, the angle formed by the collagen threads 20 of the layers not in contact with each other is not particularly limited, and may be, for example, 0 °.

  The collagen threads 20 in the first layer 11 are arranged substantially along the first direction 21, but the angle formed by the longitudinal direction of each collagen thread 20 may be slightly deviated from the first direction 21. Specifically, the direction may be shifted by about 0 to 5 ° with respect to the first direction. The angle formed by the longitudinal direction of each collagen thread 20 in the second layer 12 may also be shifted by about 0 to 5 ° with respect to the second direction 22.

  The interval between the plurality of collagen threads 20 in the first layer 11 and the second layer 12 is not particularly limited, but is preferably arranged at an interval of about 0 to 40 millimeters, more preferably about 0. About 10 millimeters, more preferably about 0 to 1 millimeter.

  The collagen film 10 has a belt-like first heat treatment region 31 along the third direction 23 and a belt-like second heat treatment region 32 along the fourth direction 24. The first heat treatment region 31 and the second heat treatment region 32 are obtained by heat-treating a partial region of the collagen film 10. This heat treatment is realized, for example, by pressing a blade-shaped heat source against the collagen film 10 and instantaneously heating to a predetermined temperature by the heat source. As an apparatus for performing such heat treatment, for example, an impulse sealer can be given. In FIG. 2, the first heat treatment region 31 and the second heat treatment region 32 are not shown.

  The third direction 23 and the fourth direction 24 are directions along each side adjacent to each other in the quadrangle that is the outer shape of the collagen membrane 10, and they are orthogonal to each other. The third direction 23 and the fourth direction 24 may be any direction along the surface of the collagen membrane 10, may or may not be along the outer shape, and is not necessarily a constant direction such as a straight line. However, it may be curved. These directions are preferably along the direction in which the stretchability of the collagen membrane 10 is improved. In addition, the third direction 23 and the fourth direction 24 do not necessarily have to be orthogonal to each other, and need only intersect at a predetermined angle. Moreover, both the 1st heat processing area | region 31 and the 2nd heat processing area | region 32 do not necessarily need to be provided, and only one side may be provided. For example, only the first heating region 31 may be provided curved in a meandering direction.

  A plurality of first heat treatment regions 31 are provided at predetermined intervals along the fourth direction 24. A plurality of second heat treatment regions 32 are provided at predetermined intervals along the third direction. The intervals between the first heat treatment region 31 and the second heat treatment region 32 are not particularly limited, and are not necessarily constant. If the interval is small, the stretchability of the collagen film 10 is improved, but the deformation of the collagen film 10 due to the heat treatment is large. Further, the width of each band of the first heat treatment region 31 or the second heat treatment region 32 is not particularly limited, but is generally about several millimeters. If the width is large, the stretchability of the collagen film 10 is improved, but the deformation of the collagen film 10 by heat treatment is large.

  The collagen membrane 10 has a hole 33 penetrating in the thickness direction. The shape and size of the hole 33 are not particularly limited as long as it penetrates the collagen film 10 in the thickness direction. However, if the hole 33 has a longitudinal direction such as a long hole or a rectangle, the collagen film 10 extends in the longitudinal direction. Although it becomes easy to extend, it will become easy to fracture | rupture with respect to the longitudinal direction. Further, if the hole 33 is enlarged, the collagen film 10 is easily stretched but is easily broken.

  A plurality of holes 33 are provided, but the number and interval thereof are not particularly limited. If the number of the holes 33 is increased, the collagen membrane 10 is easily stretched but is easily broken. If the interval is reduced, the collagen film 10 is likely to be stretched but easily broken.

  The hole 33 is provided in a region other than the first heat treatment region 31 and the second heat treatment region 32. Thereby, the improvement of the elasticity of the collagen film 10 by the 1st heat processing area | region 31 and the 2nd heat processing area | region 32 and the improvement of the elasticity of the collagen film 10 by the hole 33 are compatible. In addition, if the space | interval of the 1st heat processing area | region 31 or the 2nd heat processing area | region 32 is small, even if the hole 33 is formed in the 1st heat processing area | region 31 or the 2nd heat processing area | region 32, each action will cancel out by both. Therefore, the hole 33 is not necessarily provided in a region other than the first heat treatment region 31 and the second heat treatment region 32.

Hereinafter, a method for manufacturing the collagen membrane 10 will be described. The manufacturing method of the collagen membrane 10 is roughly divided into the following three steps.
(1) A first layer 11 in which a plurality of collagen threads 20 are arranged along a first direction 21 and a second layer 12 in which a plurality of collagen threads 20 are arranged along a second direction 22 A first step of laminating and bonding the first layer 11 and the second layer 12 together to form a thin film.
(2) A second step of forming the first heat treatment region 31 and the second heat treatment region 32 by heating in a strip shape in the third direction 23 and the fourth direction 24 along the surface of the film, respectively.
(3) A third step of forming a hole 33 penetrating the film in the thickness direction.

  In the first step, as described above, the collagen yarn 20 is spun using the solubilized collagen as a spinning dope. In wet spinning, a collagen solution is usually discharged continuously from a nozzle having a predetermined diameter into a bath filled with a desolvent such as a hydrophilic organic solvent to dehydrate and solidify the collagen solution. Thereby, the collagen thread | yarn 20 in which the collagen solution discharged from the nozzle continued in the shape of a thread | yarn is obtained. The obtained collagen thread 20 is wound up, for example, while rotating a rectangular flat plate-shaped winding member. At this time, an arbitrary first angle 21 or second angle 22 can be set by setting the angle between the long direction of the collagen thread 20 and each side of the rectangular flat plate to be a predetermined angle. For example, after winding the collagen yarn 20 by rotating the winding member while maintaining the first layer 11 at the first angle 21 while maintaining the predetermined angle, the second layer 12 is at the second angle 22. The winding member is changed to a predetermined angle and rotated so that the collagen thread 20 is wound on the first layer 11 and the second layer 12 is laminated.

  By drying the wound collagen thread 20, the collagen thread 20 of the first layer 11 and the collagen thread 20 of the second layer 12 are bonded. Alternatively, the collagen thread 20 wound may be sprayed or impregnated with a collagen solution and then dried to bond the collagen thread 20 of the first layer 11 and the collagen thread 20 of the second layer 12 together. And the rectangular thin flat film | membrane is obtained by cutting off the peripheral part of the rectangular flat plate shape in the collagen thread | yarn 20 wound up by the winding member.

  In the second step, the film is heated in a strip shape in the third direction 23 and the fourth direction 24. This band-shaped heat treatment is performed using, for example, an impulse sealer as described above. The heat treatment is preferably performed with the film in a wet state.

  In the third step, holes 33 are formed. The hole 33 can be formed by punching, for example. The third step may be performed before or after the second step, but when the holes 33 are formed, the membrane is preferably in a dry state. The collagen film 10 is obtained by forming the 1st heat processing area | region 31, the 2nd heat processing area | region 32, and the hole 33, and drying as needed.

  The collagen membrane 10 thus obtained is in a wet state soaked in physiological saline or the like when used. Since the collagen membrane 10 in a wet state has elasticity that can follow the movement of an organ or the like, for example, when the collagen film 10 is fixed to an organ that repeatedly expands and contracts, such as the stomach, intestine, heart, and lung, the movement of the organ And the collagen membrane 10 is not broken.

[Modification]
In addition, although the hole 33 is provided in the collagen film 10 which concerns on this embodiment, if desired stretchability is acquired by the collagen film 10 only by the 1st heat processing area | region 31 and the 2nd heat processing area | region 32, it is. As shown in FIG. 3, the hole 33 may not be provided.

  Moreover, although the 1st heat processing area | region 31 and the 2nd heat processing area | region 32 are provided in the collagen film 10 which concerns on this embodiment, only these may be provided. Moreover, the 1st heat processing area | region 31 or the 2nd heat processing area | region 32 does not necessarily need to be a continuous strip | belt shape, and may be provided in the shape of a broken line.

  In addition, the collagen film 10 according to the present embodiment is provided with the band-shaped first heat treatment region 31 and the second heat treatment region 32. The partial heat treatment region according to the present invention is shown in FIG. As shown, a plurality of circular regions may be dispersed without contacting each other, and the heat treatment region 34 may be provided in a so-called polka dot shape.

  Examples of the present invention will be described below.

[Example 1]
A film was formed by the manufacturing method in the embodiment described above. Specifically, swine-derived type I / III type mixed collagen powder (manufactured by Nippon Ham Co., Ltd.) was dissolved in distilled water for injection (manufactured by Otsuka Pharmaceutical Co., Ltd.) to prepare 7% by weight. Then, the 7 wt% collagen aqueous solution is filled into a syringe (DisposableBarrels / Pistons, 55 mL, manufactured by EFD), and the collagen aqueous solution is mixed with ethanol from the needle (EFD UltraDispensingTips, 27G, ID: φ0.21 mm) attached to the syringe. It discharged in the tank. The discharged 7% by weight collagen aqueous solution was dehydrated in ethanol to form a thread and then pulled up from the ethanol bath. The pulled-up collagen filament was immersed in another ethanol bath completely separated from the ethanol bath at room temperature for about 30 seconds, and further solidified. Subsequently, the collagen filaments pulled up from the second ethanol tank were wound around a plate-like member having a side of 16 cm and a thickness of 8 mm rotating at 15 rpm. In order to evenly wind the collagen thread around the plate member, the plate member was reciprocated at 1.5 mm / second using a reciprocating mechanism that periodically moves the horizontal position of the plate member. Further, when the plate-like member was rotated 365 times, its rotation axis was changed by 90 °, and this was repeated 12 times, and a total of about 4400 times of winding was performed to create a 12-layer laminate of collagen filaments. . This laminate was thermally dehydrated at 130 ° C. under reduced pressure (1 hPa or less) for 24 hours using a vacuum dry oven (EYELA: VOS-300VD type) and an oil rotary vacuum pump (ULVAC: GCD135-XA type). By performing a crosslinking reaction, a total of two collagen non-woven fabrics were created, one on each side of the plate-like member.
Next, swine-derived type I / III type mixed collagen powder (manufactured by Nippon Ham Co., Ltd.) was dissolved in distilled water for injection (manufactured by Otsuka Pharmaceutical Co., Ltd.) to prepare 1 wt%. The collagen aqueous solution prepared to 1% by weight was impregnated into the obtained collagen nonwoven fabric, formed into a film shape, and then sufficiently dried at room temperature. Thereafter, using the vacuum dry oven described above, a thermal dehydration crosslinking reaction was performed at 130 ° C. under reduced pressure (1 hPa or less) for 12 hours to obtain a membranous collagen nonwoven fabric.
With respect to this membrane-like collagen nonwoven fabric, five heat treatment regions were formed in a certain direction by an impulse sealer (Fuji Impulse Co., Ltd .: P-300) to obtain a collagen membrane 10.

[Example 2]
A membrane-like collagen nonwoven fabric was prepared in the same manner as in Example 1 described above. With respect to this membrane-like collagen nonwoven fabric, two heat treatment regions are formed in a certain direction by the aforementioned impulse sealer, and a total of 3 between the heat treatment regions and between the heat treatment region and the edge of the membrane. The hole 33 was formed in the location, and the collagen film 10 was obtained.

[Comparative example]
A membrane-like collagen nonwoven fabric was prepared in the same manner as in Example 1 described above, and dried without forming the heat treatment region and the holes 33 to obtain a collagen membrane.

[Tensile test]
The collagen membranes obtained in Examples 1 and 2 and the comparative example were immersed in water at room temperature for 2 hours to be in a wet state, and cut into strips having a size of 15 mm × 50 mm in length and width to obtain test pieces. . Using the strip-shaped long direction as the pulling direction, a tensile tester (manufactured by Shimadzu Corporation: AG-IS) holds the grip so that the distance between each gripping position is 30 mm, and pulls at a speed of 10 mm / min. Went. The force and displacement when the pulling force at that time became maximum, and the force when the test piece broke were measured. The results are shown in Table 1.

  As is clear from Table 1, in Examples 1 and 2, the force at the maximum point with respect to the comparative example was reduced, and the displacement was increased. This indicates that the collagen membranes in Examples 1 and 2 are more easily stretched and have a larger contractible displacement than the collagen membrane in the comparative example. That is, it was confirmed that the collagen membranes in Examples 1 and 2 were superior in stretchability to the collagen membranes in Comparative Examples.

DESCRIPTION OF SYMBOLS 10 ... Collagen film 11 ... 1st layer 12 ... 2nd layer 20 ... Collagen thread 21 ... 1st direction 22 ... 2nd direction 23 ... 3rd direction 24 ... -4th direction 31 ... 1st heat processing area | region 32 ... 2nd heat processing area | region 33 ... hole 34 ... heat processing area | region

Claims (9)

  At least a first layer in which a plurality of collagen threads are disposed along a first direction, and a second layer in which the plurality of collagen threads are disposed along a second direction different from the first direction. A collagen membrane that is laminated and in which a first layer and a second layer are adhered to each other, and partially includes a first heat treatment region.   The collagen film according to claim 1, wherein the first heat treatment region has a belt-like shape at least along the third direction.   The collagen film according to claim 2, wherein a plurality of the first heat treatment regions are provided at predetermined intervals.   The collagen membrane according to claim 2 or 3, comprising a strip-shaped second heat treatment region along a fourth direction intersecting with the third direction.   The collagen film according to claim 4, wherein a plurality of the second heat treatment regions are provided at predetermined intervals.   The collagen membrane according to any one of claims 1 to 5, which has a hole penetrating in the thickness direction.   The collagen membrane according to claim 6, wherein the hole is provided in a region other than the first heat treatment region and in a region other than the second heat treatment region when the second heat treatment region is provided. At least a first layer in which a plurality of collagen threads are arranged along the first direction, and a second layer in which the plurality of collagen threads are arranged along a second direction different from the first direction, A first step of laminating and bonding the first layer and the second layer together to form a thin film;
A second step of partially heating the membrane to form a heat-treated region.   The method for producing a collagen membrane according to claim 8, further comprising a third step of forming a hole penetrating the membrane in the thickness direction.

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