JP2021115285A - Liquid polymer compound composition - Google Patents

Abstract

To provide a liquid polymer compound composition that is kept in a sol state at room temperature, has better functions as a hemostatic material than those of a fibrin glue, can be readily used particularly as a hemostatic material, and can be produced at low cost.SOLUTION: A liquid polymer compound composition contains an organic acid and a hydrophilic polymer compound. The organic acid preferably comprises hydroxy organic acid, acetic acid, or a combination thereof which are liquid at room temperature. The hydrophilic polymer compound comprises a combination of one or more of collagen, gelatin, collagen peptide and water-soluble cellulose with a molecular weight of 2,000 or more and 300,000 or less. Relative to the total weight, 10-90 wt.% organic acid and 1-40 wt.% hydrophilic natural polymer compound are preferably contained. Water or amino acid are preferably contained.SELECTED DRAWING: None

Description

The present invention relates to a liquid polymer compound composition.

Tissue obstruction that prevents leakage of body fluids (blood, tissue fluid, etc.) due to tissue damage in the living body has clinical significance such as surgery. Effectively suppressing the leakage of fluid from the injured part leads to the maintenance of life during the operation of the patient and the improvement of the quality of life (QOL) after the operation.

In clinical practice, hemostasis is important. The reasons for this are as follows.
1. 1. Blood loss is one of the major causes of death, and causes of blood loss include severe trauma, aneurysms, esophageal and gastric ulcers, and rupture of esophageal varices. In particular, death is more likely if hemostasis treatment is not available urgently.
2. Bleeding during surgery is one of the major concerns in surgery, which causes systemic infections and organ dysfunction. Not only does bleeding interfere with the surgical field, but removal of bleeding blood leads to delayed surgery.
3. 3. Bleeding is a problem even when minimally invasive surgery (such as laparoscopic surgery) is performed, and if bleeding cannot be sufficiently suppressed, it may be necessary to change to open surgery.

Existing hemostasis methods include the following.
1. 1. A method of directly compressing the blood vessels in the bleeding area (compression hemostasis). The disadvantages of this hemostatic method are that it takes time and effort to maintain pressure and that the patient may develop hematomas.
2. Other methods of stopping bleeding by physical means include a method of clamping and clipping the vicinity of the bleeding part, and a method of placing something like a plug or sponge on the bleeding part. The disadvantage of these hemostatic methods is that they are difficult to handle when bleeding from a large number of microvessels.
3. 3. A method of coagulating blood with heat and cauterizing bleeding blood vessels (electric knife). The disadvantages of this method are that it causes thermal damage to surrounding tissues and is highly invasive to patients, and that medical equipment is required and requires specialization (it can only be used in medical institutions).

Examples of existing hemostatic materials include:
1. 1. Alginic acid 2. Gelatin sponge 3. Collagen fiber 4. Fibrin glue 5. Self-tissue synthetic peptide Of the above, collagen fibers and fibrin glue are often used clinically as effective hemostatic materials.

Vascular sutures may be required not only during cardiac and vascular surgery, but also during general intra-abdominal surgery. Since there is a slight blood leakage from the sutured part of the blood vessel after the operation, a hemostatic material that continuously suppresses the leakage is required.

Bile and pancreatic juice are symptoms in which bile and pancreatic juice leak out due to biliary tract surgery, pancreatitis, pancreatic surgery, etc., and have an adverse effect on other organs. Currently, there are no known substances that can effectively suppress the leakage of bile and pancreatic juice and that can be used clinically, and there is a need for a safe and effective method for preventing bile and pancreatic juice.

In the lung, there is known a condition in which air leaks due to spontaneous pneumothorax in which the alveolar sac is torn, or traumatic pneumothorax such as a rib fracture or catheter puncture. Depending on the symptom, there is no choice but to wait for spontaneous healing, and the method that can adhere to the lung tissue and close the hole in the pneumothorax just by layering on the affected area is a simple and highly safe method for treating pneumothorax. Think of it as one.

With the development of endoscopic technology, a technique for endoscopically excising a lesion has been developed. In particular, surgical methods have been established for endoscopically removing lesions such as polyps in the gastrointestinal tract including the esophagus, stomach or intestine, and early stage cancer (superficial cancer that is considered to have no lymph node metastasis). .. In endoscopic mucosal resection, generally, hypertonic saline or the like is injected into the submucosa including the lesion to raise the lesion, and the tissue including the lesion is excised with an electric knife while grasping the excised part. I do.
In this procedure, a solution such as hypertonic saline is injected into the submucosa in order to separate the lesion from the muscularis propria, but there is a problem that the bulge of the lesion cannot be maintained during surgery with a low-viscosity solution such as saline. Therefore, an infusion solution capable of maintaining the bulge of the affected area during surgery is desired.

With the development of catheter therapy, surgical methods have been established to kill tumors and fibroids by occluding the arteries that flow into lesions that are controlled by blood flow such as tumors and fibroids. Specific examples thereof include liver pulse occlusion, uterine artery occlusion, and cerebral artery occlusion.
In the procedure, a liquid such as urethane precursor or ethylene vinyl alcohol is injected to occlude the artery, but it is definitely biotoxic and its use is restricted unless it is serious. Therefore, it is desired to develop an injectable solution having no risk of infection and having low biotoxicity.
Further, the injection solution is required to be capable of adding an anticancer agent or a contrast agent.

Therefore, in recent years, there is a highly controlled self-assembling peptide that has been attracting attention as a new material due to its physical, chemical, and biological properties (see Patent Document 1). Due to its amino acid sequence, it has the property of forming a self-aggregate in which a large number of peptide molecules are regularly arranged.
The self-assembling peptide has a structure in which charged hydrophilic amino acids and electrically neutral hydrophobic amino acids are alternately arranged, and positive and negative charges are alternately distributed, and at physiological pH and salt concentration. It has a β structure.

In the application of the self-assembled peptide to hemostasis, continuous blood leakage was observed from the end of the liver incision, and complete hemostasis was not achieved. The reason for incomplete hemostasis is presumed to be insufficient adhesion between the self-assembled peptide gel and the tissue. Therefore, further improvements are needed to bring out the hemostatic effect of self-assembling peptides to clinically applicable levels.

The polyamine-aldehyde system, which is used clinically like fibrin glue and is gelled by adding formaldehyde or glutaraldehyde, which are cross-linking agents, to gelatin has the possibility of residual disorders such as vascular occlusion and low molecular weight aldehydes. It has been pointed out that it has a high degree of neurological and tissue damage, and it is by no means satisfactory.

Many studies have been conducted to overcome these problems. For example, adhesives based on crosslinked Schiff base formation, which are made from dextran and ε-poly-L-lysine (hereinafter, also simply referred to as ε-PLL), which are made from food additives, are being studied (for example,). See Patent Document 2).

Further, as a strong adhesive, a tissue adhesive containing a derivative obtained by active esterifying citric acid and a protein such as collagen as an adhesive component has also been studied (see, for example, Patent Document 3).

WO2010 / 041636 International Publication International Publication No. 2009/05/7802 Japanese Unexamined Patent Publication No. 2004-261222

However, although the tissue obstructing agent described in Patent Document 1 is a self-assembling peptide, it has a problem that it has a lower hemostatic power than fibrin glue.
Further, the adhesive of the ε-PLL raw material described in Patent Document 2 has a problem that the gel strength is inferior to that of the commercially available hemostatic agent fibrin glue, and there is a concern that the strength as a hemostatic material is insufficient.
Further, in the tissue adhesive described in Patent Document 3, the active ester compound is chemically unstable and cannot be stored for a long time in an aqueous solution, so that it is dissolved in a solvent having a risk of adversely affecting the living body immediately before use. Furthermore, there is a problem that there is a high possibility that it will cause a problem because it cannot be used immediately when the doctor uses it urgently in a surgical operation or the like.
In addition, these adhesives have a problem of being very expensive.

Furthermore, as a fundamental problem when collagen peptide, gelatin or collagen is used, there is a problem that a sol-gel phase transition occurs at room temperature. In order to solve the problem and liquefy at low temperature, a method of reducing these molecular weights can be considered. However, in that case, the effect becomes smaller with the molecular weight. In addition, in the work in that temperature range, the form changes when the work takes a long time, and the work cannot be used. In particular, it was fatal as a material if it hardened before reaching the wound site during catheter work.

The present invention has been made by paying attention to such a problem, and keeps a sol state at room temperature, has a higher function as a hemostatic material than fibrin glue, can be used immediately as a hemostatic material, and can be manufactured at low cost. It is an object of the present invention to provide a liquid polymer compound composition.

As a result of diligent studies to achieve the above object, the present inventors have found that when a composition composed of an organic acid such as hydroxyorganic acid and a hydrophilic polymer compound such as gelatin is mixed with blood, aggregation and aggregation occur. It was discovered that the viscosity became high, and the present invention was completed.

That is, the liquid polymer compound composition according to the present invention is characterized by containing an organic acid and a hydrophilic polymer compound.
The organic acid preferably comprises a hydroxy organic acid, acetic acid or a combination thereof, which is liquid at room temperature. Lactic acid is preferable as the hydroxy organic acid that is liquid at room temperature.
The hydrophilic polymer compound preferably comprises one or a combination of two or more of collagen, gelatin, collagen peptide and water-soluble cellulose having a molecular weight of 2,000 or more and 300,000 or less.
The liquid polymer compound composition according to the present invention preferably contains 10 to 90% by weight of the organic acid and 1 to 40% by weight of the hydrophilic natural polymer compound with respect to the total weight.
The liquid polymer compound composition according to the present invention preferably contains water or an amino acid.
In this case, the molar fraction of water or amino acid is preferably 1.22 times or less of the mole fraction of the organic acid.

According to the present invention, it is possible to provide a liquid polymer compound composition which maintains a sol state at room temperature, has a higher function as a hemostatic material than fibrin glue, can be used immediately as a hemostatic material, and can be produced at low cost. can.

Hereinafter, the liquid polymer compound composition according to the embodiment of the present invention will be described.
The liquid polymer compound composition of the embodiment of the present invention contains an organic acid and a hydrophilic polymer compound.
The liquid polymer compound composition of the embodiment of the present invention aggregates and becomes highly viscous when mixed with blood. The liquid polymer compound composition of the embodiment of the present invention causes a phenomenon that the sol-gel does not change due to the combination of the organic acid and the hydrophilic polymer compound.
The liquid polymer compound composition of the embodiment of the present invention maintains a sol state at room temperature, has a higher function as a hemostatic material than fibrin glue, can be used immediately as a hemostatic material, and can be manufactured at low cost.

The organic acid is preferably a carboxylic acid that is liquid at room temperature, and is particularly preferably composed of a hydroxy organic acid that is liquid at room temperature, acetic acid, or a combination thereof. In this case, normal temperature means 15 to 25 ° C. Examples of the carboxylic acid that is liquid at room temperature include formic acid, acetic acid, propionic acid, butyric acid and the like. Examples of the hydroxy organic acid include hydroxycarboxylic acid. Examples of the hydroxycarboxylic acid that is liquid at room temperature include L-form or DL-form lactic acid and β-hydroxybutyric acid. The organic acid is particularly preferably composed of lactic acid, acetic acid or a combination thereof that is liquid at room temperature.

Examples of the hydrophilic polymer compound include collagen, gelatin, collagen peptide, hyaluronic acid, alginic acid, chitin, chitosan, cellulose, hydroxypropyl cellulose, and chemical starch. In particular, as the hydrophilic polymer compound, since it can be dissolved in water and has excellent processability, it is preferable to use one or a combination of one or more of collagen, gelatin, collagen peptide and water-soluble cellulose. It is more preferably composed of collagen, gelatin or collagen peptide having a reduced molecular weight of 2,000 or more and 300,000 or less, or hydroxypropyl cellulose having a molecular weight of 2,000 or more and 300,000 or less, and having a molecular weight of 30,000 or more. 100,000 or less is particularly preferable. The hydrophilic polymer compound is a mixture of a collagen peptide having a molecular weight of 2,000 or more and 10,000 or less or a molecular weight of 10,000 or more and 30,000 or less and gelatin or collagen having an average molecular weight of 30,000 or more and 100,000 or less. It may consist of.

The liquid polymer compound composition of the embodiment of the present invention preferably contains 10 to 90% by weight of the organic acid and 1 to 40% by weight of the hydrophilic natural polymer compound based on the total weight. In the case of this compounding ratio, the liquid polymer compound composition of the embodiment of the present invention has viscoelasticity, deformability up to -10 ° C., and high tissue adhesion to organs.

In the case of only a hydrophilic polymer compound having a molecular weight of 2,000 or more and 300,000 or less, the transparency is low, the tissue adhesiveness is low, and gelation occurs in the range of 20 to 40 ° C. On the other hand, the liquid polymer compound composition containing an organic acid and a hydrophilic polymer compound having a molecular weight of 2,000 or more and 300,000 or less has increased transparency and maintains deformability by containing the organic acid. However, the sol state continues up to -10 ° C. In particular, when the organic acid is a hydroxy organic acid such as lactic acid and the hydrophilic polymer compound is collagen, gelatin or collagen peptide, the effect is remarkable. When the composition of an organic acid and gelatin or collagen peptide is used as a medical material, it becomes hydrogel-like due to the influx of ions from a living tissue, and exhibits high adhesion and crimping effect.

The liquid polymer compound composition of the embodiment of the present invention is preferably produced by dissolving a hydrophilic natural polymer compound having a molecular weight of 2,000 or more and 300,000 or less in an organic acid.
The liquid polymer compound composition preferably contains water or amino acids. In this case, it is preferable that the molar fraction of water or amino acid is 1.22 times or less of the mole fraction of organic acid.

The hydrophilic natural polymer compound of the embodiment of the present invention doubles its effect as a hemostatic material by adding an amino acid.
The amino acid is preferably composed of arginine, glycine, asparagine, proline, serine, leucine, valine or a combination thereof.

The liquid polymer compound composition according to the embodiment of the present invention includes, for edible use, a fluid for medication, water retention, texture improvement, foaming property, richness, use for utilizing water retention, and for pharmaceutical use. For applications that utilize film properties, binding properties, and oxygen barrier properties, and for industrial applications, applications that utilize film properties and protective colloidal properties, applications that utilize binding properties, and other spinning raw materials, fiber raw materials, nano or micro It can be used as a carrier raw material. In particular, it can be used as a food additive or a medical material. Food additives include pH adjusters, seasonings, acidulants, quality improvers for wheat flour and rice flour products, shelf life improvers, softeners for meat and fish and shellfish, noodle-making-related additives, calcium supplements, etc. Examples include anti-cooking agents, shape-maintaining agents, and masking agents. As medical materials, it is used for endoscopes, highly controlled medical devices (class IV), catheters, for example, biological tissue adhesives, hemostatic agents, cell preservation solutions, organ preservation solutions, artificial ointments, alveolar bone reconstruction agents, etc. Applications include biological tissue adhesion inhibitors, mucosal ridges, post-bleeding inhibitors, wound coverings or embolic substances during endovascular treatment.
As described above, the hydrophilic natural polymer compound of the embodiment of the present invention improves the fundamental defects of collagen, gelatin, and collagen peptide, compensates for the defects of fibrin glue, and can be applied to various uses. ..

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples. In the following examples, "%" means% by weight.

(Test 1)
(1) A 10% gelatin / aqueous solution of gelatin (molecular weight: 100,000 or more) was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., a sol-gel change occurred at around 30 ° C.
(2) An attempt was made to prepare a 10% gelatin / glycerin solution of gelatin (molecular weight: 100,000 or more), but gelatin was not dissolved in glycerin. Therefore, a 10% / 50% glycerin aqueous solution of gelatin (molecular weight: 100,000 or more) was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., a sol-gel change occurred at around 30 ° C.
(3) A 10% gelatin / lactic acid solution of gelatin (molecular weight: 100,000 or more) was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., the sol-gel did not change in any temperature range, and the sol remained as a sol (viscous liquid) in all temperature ranges.
(4) A 10% gelatin / acetic acid solution of gelatin (molecular weight: 100,000 or more) was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., the sol-gel did not change in any temperature range, and the sol remained as a sol (viscous liquid) in all temperature ranges.
(5) A 10% gelatin / 90% sodium lactate aqueous solution of gelatin (molecular weight: 100,000 or more) was prepared, but gelatin was not dissolved in the 90% sodium lactate aqueous solution. Therefore, a gelatin (molecular weight of 100,000 or more) / 1 M sodium lactate aqueous solution was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., a sol-gel change occurred at around 30 ° C.
(6) A 10% gelatin / 50% gluconic acid aqueous solution of gelatin (molecular weight: 100,000 or more) was prepared.
When the prepared solution was heated and lowered between 0 and 50 ° C., a sol-gel change occurred at around 30 ° C.

From the above results, it can be seen that the sol-gel physical characteristic change normally caused between gelatin and water is rejected between gelatin and lactic acid. That is, it is considered that a strong interaction between gelatin and organic acid is working. As described above, since the sol-gel phase transition change does not occur in the gelatin / lactic acid solution, medical additives such as food additives and hemostatic materials are used as materials that do not change in the work performed in the range of 0 to 50 ° C. It can be used as a material.

[Experiment 1]
1 ml of human blood was mixed with 1 ml of each sample shown in Table 1, and the state of the sample / blood mixture after 1 minute and 10 minutes was observed.

Samples include various organic acids alone (1-8), lactic acid and various amino acid compositions (9-14) (molar ratio 1: 1), gelatin and various organic acid compositions (15, 16) ( A composition of gelatin, glycerin and lactic acid (17) (with a weight ratio of 1: 4.5: 4.5) was used.

The sample / blood mixture was compared with the state of the sample before mixing, and the state when the mixture was pushed with a syringe (elasticity) and the state when the mixture was rotated with a syringe (viscosity) were evaluated. The evaluation results are shown in Table 1. In Table 1, those with increased effects are indicated by ↑, those with decreased effects are indicated by ↓, and those with unchanged effects are indicated by →. In addition, the effect of lactic acid is defined as ↑↑, and those that clearly exceed the effect are indicated by ↑↑↑ 2.5, ↑↑↑, and ↑↑↑↑.

As a result, in the blood mixture of gelatin / lactic acid composition (16), small aggregates were formed, and an increase in elasticity and viscosity could be confirmed. Furthermore, the whole was solidified. Similarly, an increase in elasticity and viscosity was confirmed in the blood mixture of gelatin / glycerin / lactic acid composition (17). The blood mixture of the gelatin / acetic acid composition (15) was weaker than the blood mixture of the gelatin / lactic acid composition (16), but an increase in elasticity and viscosity was confirmed. It is assumed that the higher the elasticity and viscosity, the higher the hemostatic effect.

[Experiment 2]
As shown in Table 2, No. 2 was a mixture of 10% gelatin lactic acid solution and 10% gelatin aqueous solution with different concentrations. We prepared from 0 to 9, and conducted an experiment to check the temperature at which it solidifies when the temperature was lowered.

The results are shown in Table 2. No. When the mole fraction of water or amino acid was 1.22 times or less of the mole fraction of lactic acid as in 0 to 4, the viscosity increased even at -3.8 ° C, but did not solidify. On the other hand, No. When the molar fraction of water or amino acid was 1.63 times or more the molar fraction of lactic acid as in 5-9, it solidified at 15.6 to 17.6 ° C.

Claims (6)

A liquid polymer compound composition comprising an organic acid and a hydrophilic polymer compound. The liquid polymer compound composition according to claim 1, wherein the organic acid comprises a hydroxy organic acid that is liquid at room temperature, acetic acid, or a combination thereof. The first or second claim, wherein the hydrophilic polymer compound comprises one or more combinations of collagen, gelatin, collagen peptide and water-soluble cellulose having a molecular weight of 2,000 or more and 300,000 or less. Liquid polymer compound composition. The liquid polymer compound according to any one of claims 1 to 3, which contains 10 to 90% by weight of the organic acid and 1 to 40% by weight of the hydrophilic natural polymer compound with respect to the total weight. Composition. The liquid polymer compound composition according to any one of claims 1 to 4, which comprises water or an amino acid. The liquid polymer compound composition according to claim 5, wherein the molar fraction of water or amino acid is 1.22 times or less the mole fraction of the organic acid.