Method for treatment of ischaemic tissue

• US 20070056595A1
• Filed: 11/03/2003
• Published: 03/15/2007
• Est. Priority Date: 04/24/2003
• Status: Abandoned Application

• Current Assignee: Craig Mclachlan
• Original Assignee: Craig Mclachlan
• Inventors: McLachlan, Craig
• Application Number:
  US10/554,427
• Publication Number:
  US 20070056595A1
• Time in Patent Office: Days
• US Class Current: 128/898
• CPC Class Codes: A61B 17/34 Trocars; Puncturing needles pointed biopsy instruments A61B10/0233; devices for piercing the ear-lobes A44C7/001; seals or hemostasis valves A61M39/06
• CPC Class Codes: A61B 17/3468 for implanting or removing devices, e.g. prostheses, implants, seeds, wires devices for implanting seeds A61M37/0069
• CPC Class Codes: A61B 2017/00243 cardiac
• CPC Class Codes: A61B 2017/00247 Making holes in the wall of the heart, e.g. laser Myocardial revascularization
• CPC Class Codes: A61B 2018/00392 Transmyocardial revascularisation
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence

Abstract

A method for treating ischaemic tissue comprising cutting the tissue to form a wound, and locating a sponge-like element (1) structured to receive blood and to comply with the movement of the tissue, in contact with a source of blood whereby the element (1) receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element (1).

Claims

1. A method for treating ischaemic tissue comprising

cutting the tissue to form a wound;

providing a sponge-like element, the element being structured to receive blood and to comply with the movement of the tissue; and

locating the element in the wound and in contact with a source of blood whereby the element receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element.

2. A method according to claim 1 wherein the element has the compliance of a polyurethrane.

35. The method according to claim 1 wherein the source of blood is the wound.

36. The method according to claim 1 wherein the sponge-like element has a pore size of between 50 and 200 microns in diameter.

37. The method according to claim 1 wherein the sponge-like element has a pore space of between 50% and 90% of the total volume of the element.

38. The method according to claim 1 wherein the sponge-like element defines a recess.

39. The method of claim 38 wherein the recess extends along a substantial portion of the length of the element.

40. A method according to claim 1 wherein the element comprises a compound selected from the group consisting of:

polyether urethane, a polyether urethane urea, a polyether carbonate urethane, a polyether carbonate urethane urea, a polycarbonate urethane, a polycarbonate urethane urea, polycarbonate silicone urethane, a polycarbonate silicone urethane urea, a polydimethylsiloxane urethane, a polydimethylsiloxane urethane urea, a polyester urethane, a polyester urethane urea, pellethane, chronoflex, hydrothane, estane, Elast-Econ, Texin, a Biomer type polyurethane, Surethane, Corethane, Carbonate, Techoflex, Techothane, Biospan, elastin, tropoelastin, collagen, starch, fibrin, polyhydroxyalkanoate, poly(1,3-trimethylene carbonates, tofu, caprolactone-co-L-Lactide, poly-L-lactide, poly(glycerol-sebacate), and a mixture of two or more of the foregoing compounds.

41. A method according to claim 1 wherein the wound is formed in ischaemic tissue.

42. A method according to claim 1 wherein the wound is formed in infarcted tissue.

43. A method according to claim 1 wherein the wound is formed in fibrotic tissue or scar tissue.

44. A method according to claim 1 wherein the wound is formed in ventricular tissue.

45. A method according to claim 1 wherein the tissue is cut to form the wound by incising the tissue.

46. A method according to claim 45 wherein the tissue is incised by a laser.

47. A method according to claim 1 wherein the element further comprises at least one agent for controlling growth of tissue and angiogenesis throughout and beyond the element.

48. A method according to claim 47 wherein the at least one agent controls regeneration of the tissue.

49. A method according to claim 47 wherein the at least one agent promotes or stimulates regeneration of the tissue.

50. A method according to claim 47 wherein the at least one agent is selected from the group consisting of:

an epidermal growth factor agonist, transforming growth factor-beta antagonist 1, transforming growth factor-beta antagonist 2, transforming growth factor-beta antagonist 3, a platelet-derived growth factor antagonist, angiotensin converting enzyme (ACE), an Ang II receptor antagonist, AT1 (losartan), AT2 (PD123177)], an inhibitor of a plasminogen activator, an inhibitor of a matrix metalloproteinase, an inhibitor of collagen prolyl hydroxylase, an inhibitor of urokinase-type plasminogen activator, a Bradykinin B2 receptor antagonist, Hoe140, an inhibitor of cyclooxygenase, indomethacin, a calmodulin antagonist, an anesthetic, lidocaine, pentobarbital, an inhibitor of polymorphonuclear leukocyte elastase, an inhibitor of leukocyte migration, and a mixture of two or more of the foregoing.

51. A method according to claim 1 wherein the element further comprises at least one type of cells for growth of tissue and angiogenesis throughout and beyond the element.

52. A method according to claim 51 wherein the at least one type of cells is selected from the group consisting of:

endothelial cells, smooth muscle cells, skeletal muscle cells, pericytes, embryonic stem cells, stem cells, cultured myocytes or precursors of cardiomyocytes, myofibroblasts, fibroblasts, and cells expressing proteins that promote angiogenesis or cell growth.

53. A method according to claim 1 wherein the element further comprises at least one agent for controlling angiogenesis throughout the element.

54. A method according to claim 53 wherein the at least one agent for controlling angiogenesis is selected from the group consisting of:

IGF, TGF-, TGF-, VEGF, FGF, —

FGF, GAS-6, PDGF, PIGF, CSF, GM-CSF, MCP-1, heparin, warfarin, an inhibitor of a matrix metalloproteinase, an agonist of a matrix metalloproteinase, Simvastatin, a nicotinic analogue, a nicotinic agonist, a nicotinic antagonist, angiopoiten, a dopamine analogue, a dopamine agonist, a dopamine antagonist, a cytokine, a serine protease, and a mixture of two or more of the foregoing.

55. A method according to claim 1 wherein the element comprises an agent for attracting cell types to the element.

56. The method according to claim 55 wherein the agent for attracting cell types to the element is capable of attracting stem cells or resident satellite cells.

57. The method of claim 55 wherein the agent for attracting cell types to the element is SDF-1 or CXCR-4.

58. A method according to claim 1 wherein the tissue is muscle tissue.

59. A method according to claim 1 wherein the tissue is cardiac tissue.

3-34. -34. (canceled)

60. A method for treating ischaemic heart disease comprising:

cutting ventricular or septal cardiac tissue to form a wound;

providing a sponge-like element, the element being structured to receive blood and to comply with the movement of the tissue; and

locating the element in the wound and in contact with a source of blood whereby the element receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element.

61. A method for treating myocardial infarction comprising:

cutting ventricular or septal cardiac tissue to form a wound;

providing a sponge-like element, the element being structured to receive blood and to comply with the movement of the tissue; and

locating the element in the wound and in contact with a source of blood whereby the element receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element.

62. A method for promoting or stimulating angiogenesis in ischaemic tissue comprising:

cutting non-ischaemic tissue that is adjacent ischaemic tissue to form a wound;

providing a sponge-like element, the element being structured to receive blood and to comply with the movement of the tissue; and

locating the element in the wound and in contact with a source of blood whereby the element receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element and into the ischaemic tissue.

64. A method for promoting or stimulating angiogenesis in ischaemic heart tissue comprising:

cutting ischaemic tissue to form a wound in communication with the ventricular cavity;

providing a sponge-like element, the element being structured to receive blood and to comply with the movement of the tissue; and

locating the element in the wound and in communication with the ventricular cavity whereby the element receives blood from the ventricular cavity to thereby promote tissue growth and angiogenesis throughout and beyond the element and into the ischaemic tissue.