CA2617668C

CA2617668C - A hemangioma clip having a biological membrame

Info

Publication number: CA2617668C
Application number: CA2617668A
Authority: CA
Inventors: Songtao Qi; Guofeng Xu
Original assignee: SUMMIT (GD) BIOTECH CO Ltd
Current assignee: SUMMIT (GD) BIOTECH CO Ltd
Priority date: 2005-08-04
Filing date: 2006-07-27
Publication date: 2011-11-08
Anticipated expiration: 2026-07-27
Also published as: EP1911406B1; AU2006275235B2; DE602006014161D1; AU2006275235C1; CA2617668A1; RU2008107011A; ATE466529T1; EP1911406A4; WO2007014518A1; US20070032806A1; AU2006275235A1; CN100482178C; JP4891996B2; RU2423938C2; JP2009502371A; CN1907234A; EP1911406A1; US8197500B2

Abstract

A hemangioma clip having a biological membrane is composed of a metal clip and a biological membrane 3, wherein the metal clip is made of medical stainless steel or titanium alloy, and its structure includes a first clamping rod 5 and a second clamping rod 6 overlapping one another. The rear parts of the rods are connected via a resilient member 7. There are provided a first clamping arm 1 and a second clamping arm 2 at the respective ends of the half collars 8, 9 of the first clamping rod 5 and the second clamping rod 6. Two ends of the biological membrane 3 are fastened on the first clamping arm 1 and the second clamping arm 2 respectively, forming a membrane cover.

Description

i A HEMANGIOMA CLIP HAVING A BIOLOGICAL MEMBRANE
FIELD OF THE INVENTION

[0001] The present invention relates to a medical device for human implantation, and in particular, to a clip for treating hemangioma.
BACKGROUND OF INVENTION

[0002] Hemangiomas, and especially aneurysms, are one of the most common vascular diseases. There are many treatment methods for hemangiomas, but for hemangiomas having certain morphology, applying a clip to the sac at the root (i.e., the site parallel to the vessel wall) so as to close the sac is a simple treatment method which is particularly suitable, especially for sites difficult to expose. This method has been applied in clinical treatment for some time and the short-term efficacy is very satisfactory.

[0003] However, because the side of the vascular wall perpendicular to the axis also becomes thinner due to elongation when a hemangioma is formed, closing one side can stretch the other side even thinner and result in a risk of a new hemangioma being formed, thereby lowering treatment efficacy. In addition, a conventional hemangioma clip is not effective for treatment of fusiform aneurisms. In light of the above reasons, there still remains a need for an improved aneurysm clip which overcomes the drawbacks mentioned above.

SUMMARY OF THE INVENTION
[0003a] In one aspect of the present invention, there is provided a hemangioma clip comprising: a metal clip made of medical stainless steel or titanium alloy with a first clamping rod and a second clamping rod, whose rear parts are connected through a resilient member and cross and overlap, the first clamping rod comprising a first half collar at whose end disposed is a second clamping arm, and the second damping rod comprising a second half collar at whose end disposed is a first clamping arm; and a biological membrane stabilized on the first clamping arm and the second clamping arm to form membrane cover.

[0003b] In another aspect of the present invention, there is provided a method of preparation of the biological membrane of the hemangioma dip as described above, wherein the biological membrane is formed from a diaphragm, fatty omentum, pericardium and intestinal membranes of pigs, cows or sheep, by crosslinking and fixing, and treating to remove antigens.

[0004] The present invention aims at providing a new-type of hemangioma clip having a biological membrane, which is relatively hard and covers the vessels located at the site clamped by the clip, so as to prevent further la changes of the site, prevent the hemangioma sac from rupturing, and to greatly increase the efficacy of treatment.

[0005] Another purpose of the present invention is to provide a method of manufacturing of the hamangioma clip having a biological membrane mentioned above.

[0006] In order to attain the above-described aims of the invention, the following technological solution is implemented. The hemangioma clip comprises a metal clip and a biological membrane, wherein the metal clip is made of medical stainless steel or titanium alloy, its configuration includes a first clamping rod and a second clamping rod whose rear parts are connected through a resilient member and whose rear parts cross and overlap, and at the ends of the half collars on the first clamping rod and on the second clamping rod are respectively disposed on the first clamping arm and the second clamping arm. The two ends of the biological membrane are stabilized on the first clamping arm and on the second clamping arm respectively to form a membrane cover.

[0007] The biological membrane is made of a diaphragm, the fatty omentum, the pericardium, and the intestinal membranes of pigs, cows or sheep, by crosslinking and fixing, and treating to remove antigens. Such raw materials are easy to obtain, have low cost, and are useful for commercializing and application.

[0008] Animal tissues are easy to degrade or to decompose, and conventionally, aldehydes (formaldehyde, glutaraldehyde, and so on) have been adopted to crosslink and fix them, so as to increase stability. However, since aldehydes crosslink with proteins through condensation and the crosslinked product may release toxic aldehydes when degrading, the products fixed with aldehydes have long-term residual toxicity. Such drawbacks may not exist when non-aldehydic fixatives, such as epoxides, diamides, diisocyanates, or carbodiimides, are used. For example, epoxides crosslink with proteins via a ring cleavage reaction and they do not reform after cleaving the ring group. Epoxide-crosslinked tissues degrade among other to alcohols which can be metabolized and do not have the high toxicity of residual aldehydes. Therefore, the treated animal tissues have higher stability when fixed with epoxides than those fixed with aldehydes.

[0009] According to modern immunological theory, the antigenicity of animal tissues stems mainly from active groups located at specific sites and in specific conformations, and these active groups include -OH, -NH2, -SH, etc. The specific conformations result mainly from some specific hydrogen bonding formed by spiral protein chains. The specific sites and conformations are called antigen determinants. When treating the animal ligaments, one or several small, active reagents (e.g., acid anhydrides, acid chlorides, acylamides, epoxides, etc.) which can readily react with these groups are used to bind and block these groups, which in turn effectively minimizes the antigenicity, and in the meantime strong hydrogen bonding reagents (e.g., guanidine compounds) are utilized to form new hydrogen bonds and replace the inherent hydrogen bonding of the specific conformations, which changes the specific conformations and further effectively minimizes the antigenicity.

[0010] After being crosslinked and fixed with an epoxide, the animal membrane tissues are hard to degrade or to decompose. Their antigenecity is eliminated by blocking active groups in protein molecules and changing their conformation. The biological membrane made of such animal tissues has no residual toxicity or chronic immune rejection, while it has good biocompatibility.
In addition, the hemangioma clip having a biological membrane may cover the peripheral region of the vessels locating at the site clamped by the clip, and the biological membrane may grow to fuse into the external membrane of the blood vessel, effecting biological reinforcement and leading to ideal efficacy.

[0011] In an optimal embodiment, the surface of the biological membrane, made of animal hard-membrane tissues, is an active coating which comprises active components of certain specific polypeptides or glucosaminoglycans to adhere growth actors. One of the polypeptides is produced by 16 lysines (K16), glycine (G), arginine (R), aspartic acid (D), serine (S), proline (P), and cysteine (C), through condensation. The glucosaminoglycan may be hyaluronic acid, chondroitin sulfate, dermatan sulfate, heparin, heparitin sulfate, or keratan sulfate. These active components facilitate fusing of the vessel wall cells covered by the biological membrane with the vessel wall tissues so as to effect biological reinforcement.

[0012] The biological membrane has the same length as the circumference of the collar formed by the respective half collars.

[0013] In the method for manufacturing the hemangioma clip having a biological membrane, the biological membrane is prepared with natural animal tissues of hard-membrane as the raw material, according to the following steps:

[0014] 1) Pretreatment: Initial sterilization is performed using a broad spectrum, highly-effective, low-toxicity bactericide, followed by trimming irregular portions.

[0015] 2) Fixation: The protein molecules in the membrane raw material are crosslinked and fixed with a fixative.

[0016] 3) Antigen elimination: The specific active groups of proteins in the raw material, such as -OH, -NH2, -SH, and so on, are blocked with active reagents, and the specific conformation of thereof is changed, by substituting reagents with strong hydrogen bonds for the special hydrogen bonds in helix chains of protein molecules in the substrate.

[0017] Finally, the two ends of the biological membrane obtained through the above steps, are stabilized on the clamping arms of the metal clip, respectively.

[0018] As an optimized strategy, the method for preparing the hemangioma clip having a biological membrane further includes an additional step, wherein by means of a coupling agent, the surface of the biological membrane couples with an active coating which contains active components of certain specific polypeptides or glucosaminoglycans so as to adhere growth factors.

[0019] The fixative involved in the preparation of the hemangioma clip having a biological membrane may be one or two reagents which readily undergo a crosslinking reaction with a protein molecule, such as, e.g., an epoxide, a diamide, a diisocyanate, or a carbodiimide; epoxides are preferable.

[0020] The epoxide may be a monoepoxide of the following formula R "~N7 O
or may be a diepoxide of the following formula 7?*"' n 7 O O
wherein R=Cõ H2i+1, and n=0-10.

[0021] In the method for preparing the hemangioma clip having a biological membrane, the active reagents may be organic compounds with small molecular weight, such as organic anhydrides, acyl chlorides, acylamides, monocyclic epoxides; and the reagents with strong hydrogen bonds may be guanidine compounds.

[0022] In the method for preparing the hemangioma clip having a biological membrane, the coupling agent, which is used for coupling with the active coating containing active components of certain specific polypeptide or glucosaminoglycan may be a diamide, a dianhydride, a diepoxide, or any other reagent with double functional groups to react with groups such as -NH2, -OH
and -COOH.

[0023] The advantages of the present invention include: (1) the hemangioma clip having a biological membrane may cover the peripheral region of the vessels located at the site clamped by the clip so as to prevent the hemangioma from deterioration; (2) the hemangioma clip having a good biocompatibility so as to fuse with the external wall of the vessels, exhibiting biological effects of thickening and reinforcing; and (3) the hemangioma having excellent efficacy, safety and reliability for use.

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a structural view of a hemangioma clip according to one embodiment of the present invention.

[0025] FIG. 2 is a magnified view of the region labeled "A" of the hemangioma clip of FIG. 1.

[0026] Legend: I - First clamping arm; 2 - Second clamping arm; 3 -Biological membrane; 4 - Active coating; 5 - First clamping rod; 6 - Second clamping rod; 7 - Resilient member; 8 - Half collar; 9 - Half collar; 10 -Collar.
EXAMPLES

[0027] Example 1 [0028] Referring to FIGS. 1 and 2, the biological hemangioma clip comprises a metal clip and a biological membrane 3. The metal clip comprises the first clamping rod 5 and the second clamping rod 6, whose rear parts are connected through a resilient member 7, cross and overlap. The first clamping rod 5 and the second clamping rod 6 comprise respectively the half collar 8 on the first clamping rod 5; and the half collar 9 on the second clamping rod 6, at whose two ends are disposed the first clamping arm I and the second clamping arm 2.

[0029] The two ends of the biological membrane 3 are stabilized on the first clamping arm 1 and the second clamping arm 2, respectively, to form a membrane cover. The length of the biological membrane 3 is the same as the circumference of the collar 10 formed by the half collar 8 and the half collar 9, and its breadth is the same as the length of the clamping arm or its two ends are both respectively longer than the clamping arm by about 1-2 mm.

[0030] The biological membrane 3 couples with the active coating 4 containing active components such as certain specific polypeptides or glucosaminoglycans to bind growth factors. An exemplary polypeptide is made of 16 lysines (K16), glycine (G), arginine (R), aspartic acid (D), serine (S), proline (P), and cysteine (C), through condensation.

[0031] The glucosaminoglycan may be hyaluronic acid, chondroitin sulfate, dermatan sulfate, heparin, heparitin sulfate, or keratan sulfate. The biological membrane is formed from the diaphragm, the fatty omentum, the pericardium and the intestinal membranes from pigs, cows or sheep, by crosslinking and fixing through an epoxide, and treating to remove antigens. The metal clip may be made of medical stainless steel or titanium alloy.

[0032] In the method for preparing the hemangioma clip having a biological membrane, the biological membrane is prepared with natural animal tissues of hard-membrane as the raw material, according to the following steps:

[0033] 1) Pretreatment: Initial sterilization is performed using a broad spectrum bactericide, followed by trimming irregular portions.

[0034] 2) Fixation: The protein molecules in the membrane raw material are crosslinked and fixed with a fixative.

[0035] 3) Antigen elimination: The specific active groups of proteins in the raw material, such as -OH, -NH2, -SH, and so on, are blocked with active reagents, and the specific conformation thereof is changed, by substituting reagents with strong hydrogen bonds for the special hydrogen bonds in helix chains of protein molecules in the substrate.

[0036] 4) Mediated by a coupling agent, the surface of the biological membrane couples with an active coating which contains active components of certain specific polypeptides or glucosaminoglycans so as to bind growth factors.

[0037] Finally, the two ends of the obtained biological membrane are stabilized on the clamping arms of the metal clip with a medical adhesive, respectively. And hence the product of this present invention described herein is made.

[0038] The fixative may be one or two of the reagents which readily undergo a crosslinking reaction with a protein molecule, such as an epoxide, a diamide, a diisocyanate, or a carbodiimide. The epoxide may be a monoepoxide of the following formula, R

O
or may be diepoxide of the following formula:

n 0 0 wherein R=CnH2n+1, and n=0-10.

[0039] The active reagents may be organic compounds with small molecular weight, such as organic anhydrides, acyl chlorides, acylamides, monocyclic epoxidess; and the reagents forming strong hydrogen bonds may be guanidine compounds.

[0040] The coupling agent may be a diamide, a dianhydride, a diepoxide, or any other reagent having double functional groups to undergo a reaction with such groups as -NH2, -OH and -COOH.

Claims

1. A hemangioma clip comprising:

a metal clip made of medical stainless steel or titanium alloy with a first clamping rod and a second clamping rod, whose rear parts are connected through a resilient member and cross and overlap, the first clamping rod comprising a first half collar at whose end disposed is a second clamping arm, and the second clamping rod comprising a second half collar at whose end disposed is a first clamping arm; and a biological membrane stabilized on said first clamping arm and said second clamping arm to form a membrane cover.

2. The hemangioma clip of claim 1, wherein said biological membrane is formed from a diaphragm, fatty omentum, pericardium and intestinal membranes of pigs, cows or sheep, by crosslinking and fixing, and treating to remove antigens.

3. The hemangioma clip of claim 1 or 2, wherein said biological membrane (3) couples with an active coating (4) containing active components so as to bind growth factors.

4. The hemangioma clip of claim 3, wherein the active components are polypeptides or glucosaminoglycans.

5. The hemangioma clip of claim 4, wherein one of said polypeptides is made of 16 lysines (K16), glycine (G), arginine (R), aspartic acid (D), serine (S), proline (P), and cysteine (C), through condensation, and said glucosaminoglycan is hyaluronic acid, chondroitin sulfate, dermatan sulfate, heparin, heparitin sulfate, or keratan sulfate.

6. The hemangioma clip of any one of claims 1 to 5, wherein the length of said biological membrane (3) is the same as the circumference of a collar (10) formed by the fist half collar (8) and the second half collar (9).

7. The hemangioma clip of any one of claims 1 to 6, wherein said biological membrane (3) is prepared from hard-membrane natural animal tissues taken as the raw material, according to the following steps:
1) Pretreatment: Initial sterilization is performed using a broad spectrum bactericide, followed by trimming irregular portions;
2) Fixation: Protein molecules in the biological membrane (3) are crosslinked and fixed with a fixative;

3) Antigen elimination: The active groups of proteins in the biological membrane (3) are blocked with active reagents, and the specific conformation of them is changed, by substituting reagents forming strong hydrogen bonds for the special hydrogen bonds in helix chains of protein molecules in the substrate; finally, ends of the obtained biological membrane (3) are stabilized on the clamping arms of the metal clip with a medical adhesive, respectively.

8. The hemangioma clip of claim 7, wherein the active groups are -OH, -NH2 and -SH.

9. The hemangioma clip of claim 7 or 8, comprising the following additional step:
4) coupling of the surface of the biological membrane (3) with the active coating (4) by means of a coupling agent, where the active coating comprises active components of polypeptides or glucosaminoglycans, so as to bind growth factors.

10. The hemangioma clip of any one of claims 7 to 9, wherein said fixative is one or two fixative reagents that readily undergo a crosslinking reaction with a protein molecule.

11. The hemangioma clip of claim 10, wherein the fixative reagents are selected from the group consisting of an epoxide, a diamide, a diisocyanate, and a carbodiimide.

12. The hemangioma clip of claim 11, wherein said epoxide is a monoepoxide of the following formula or a diepoxide of the following formula where R=C n H2n+1, and n=0-10.

13. The hemangioma clip of any one of claims 7 to 12, wherein said active reagent is an organic acid, an anhydride with a low molecular weight, an acetyl chloride, an acrylamide, or a monocyclic oxide, and said reagent forming strong hydrogen bonds is a guanidine compound.

14. The hemangioma clip of any one of claims 7 to 13, wherein the coupling agent is an acetyl diamide, a dianhydride, a diepoxide, or any other compound with double functional groups, which participates in a condensation reaction with active groups.

15. The hemangioma clip of claim 14, wherein the active groups are -NH2, -OH and -COOH.

16. A method of preparation of the biological membrane of the hemangioma clip as described in claim 1, wherein said biological membrane is formed from a diaphragm, fatty omentum, pericardium and intestinal membranes of pigs, cows or sheep, by crosslinking and fixing, and treating to remove antigens.

17. The method of claim 16, wherein said biological membrane (3) couples with an active coating (4) containing active components so as to bind growth factors.

18. The method of claim 17, wherein the active components are certain specific polypeptides or glucosaminoglycans.

19. The method of claim 18, wherein one of said polypeptides is made of 16 lysines (K16), glycine (G), arginine (R), aspartic acid (D), serine (S), proline (P), and cysteine (C), through condensation, and said glucosaminoglycan is hyaluronic acid, chondroitin sulfate, dermatan sulfate, heparin, heparitin sulfate, or keratan sulfate.

20. The method of any of claims 16 to 19, wherein the length of said biological membrane (3) is the same as the circumference of a collar (10) formed by the fist half collar (8) and the second half collar (9).

21. The method of any one of claims 16 to 20, wherein said biological membrane (3) is prepared from hard-membrane natural animal tissues taken as the raw material, according to the following steps:

1) Pretreatment: Initial sterilization is performed using a broad spectrum bactericide, followed by trimming irregular portions;

2) Fixation: Protein molecules in the biological membrane (3) are crosslinked and fixed with a fixative;

3) Antigen elimination: The active groups of proteins in the biological membrane (3) are blocked with active reagents, and the specific conformation of them is changed, by substituting reagents forming strong hydrogen bonds for the special hydrogen bonds in helix chains of protein molecules in the substrate; finally, ends of the obtained biological membrane (3) are stabilized on the clamping arms of the metal clip with a medical adhesive, respectively.

22. The method of claim 21, wherein the active groups are -OH, -NH2 and -SH.

23. The method of claim 21 or 22 comprising the following additional step:

4) Coupling of the surface of the biological membrane (3) with the active coating (4) by means of a coupling agent, where the active coating comprises active components of polypeptides or glucosaminoglycans, so as to bind growth factors.

24. The method of any one of claims 21 to 23, wherein said fixative is one or two fixative reagents that readily undergo a crosslinking reaction with a protein molecule.

25. The method of claim 24, wherein the fixative reagents are selected from the group consisting of an epoxide, a diamide, a diisocyanate, and a carbodiimide.

26. The method of claim 25, wherein said epoxide is a monoepoxide of the following formula or a diepoxide of the following formula where R=C n H2n+1, and n=0-10.

27. The method of any one of claims 21 to 26, wherein said active reagent is an organic acid, an anhydride with a low molecular weight, an acetyl chloride, an acrylamide, or a monocyclic oxide, and said reagent forming strong hydrogen bonds is a guanidine compound.

28. The method of claim 23, wherein the coupling agent is an acetyl diamide, a dianhydride, a diepoxide, or any other compound with double functional groups, which participates in a condensation reaction with active groups.

29. The method of claim 28, wherein the active groups are -NH2, --OH and -COOH.