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Negative pressure wound dressing piece

A technology for wounds and materials, applied in dressings, adhesive dressings, non-adhesive dressings, etc., can solve problems such as ineffective NPWT treatment and obstacles to negative pressure transmission at the wound interface

Pending Publication Date: 2022-03-11
AROA BIOSURGERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the context of NPWT, these materials present a substantial barrier to negative pressure delivery at the wound interface, where the associated pressure drop renders NPWT treatment ineffective

Method used

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  • Negative pressure wound dressing piece
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  • Negative pressure wound dressing piece

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0198] Example 1: Manufacturing method

[0199] The bioabsorbable layer 105 with x-shaped pores 119 was prepared according to the following method. refer to Figure 39-41 , a sheet of reticulated structure was prepared according to the method described in PCT application PCT / NZ2009 / 000152 to provide material 95 for processing using punching / perforating equipment 89 .

[0200] The blanking device 89 includes an upper press assembly including a punch retaining plate 92 , a punch needle assembly 99 and a clamping plate 90 . Punch assembly 99 includes a punch 93 and a punch holder 91 that is shaped to produce the desired final bore.

[0201] In this example, the punch 93 is shaped to produce Figure 16 The x-shaped aperture 119 is shown in (i) and has a width and height of approximately 5.5 millimeters with a slot thickness or width of approximately 0.5 millimeters.

[0202] The blanking apparatus 89 includes a press plate 94 aligned to translate along the same axis as the upp...

example 2

[0206] Example 2: Measuring pressure drop across various bioabsorbable layers

[0207] The following examples outline the equipment and test methods used to evaluate and compare the pressure drop of various materials and different forms of bioabsorbable layers. refer to Figure 42 , a pressure drop test apparatus 79 is constructed, which includes a base plate 81 , a base support 80 and a clamping ring 86 . The clamping ring 86 includes circumferential grooves ( Figure 42 not shown) to accommodate a rubber O-ring or other form of seal 85.

[0208] Base plate 81 includes two ports 82, each connected to a separate pressure sensor. Each pressure sensor is capable of accurately measuring vacuum pressure in the range of 0–400mmHg. The pressure sensors are referred to herein as measurement points P2 and P3. The two ports 82 are spaced approximately 45 millimeters apart. Base plate 81 may also include three spare ports 83 spaced about 45 millimeters from central pressure measur...

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Abstract

The present invention relates to a multi-layer wound dressing for applying negative pressure to a wound. The dressing member includes a bioabsorbable layer for placement in contact with a wound; a fluid impermeable occlusive outer layer; a fluid porous transport layer positioned between the outer layer and the bioabsorbable layer; and a fluid conduit in fluid communication with the delivery layer for coupling to a negative pressure source. The delivery layer includes a plurality of fluid passages between the catheter and the bioabsorbable layer to allow fluid to pass through the layers of the dressing member to and from the bioabsorbable layer. The bioabsorbable layer includes a plurality of apertures to enable exudate flow from the wound to the delivery layer.

Description

technical field [0001] The present invention relates to a wound dressing, in particular a dressing for applying negative pressure and / or instilling a therapeutic fluid to a wound. Background technique [0002] Techniques that use negative pressure to promote soft tissue healing have been used for years, but the core principles of the treatment have remained largely the same. [0003] In the case of an open wound, negative pressure wound therapy (NPWT) typically involves placing a porous material such as open-cell foam, reticulated foam, or gauze over the wound site, sealing the wound cavity with an occlusive layer, and Negative pressure is applied to the sealed wound environment (see Figures 1 and 2). The clinical efficacy of this treatment is well supported in areas such as acute and chronic wounds, which have demonstrated accelerated formation of granulation tissue in open wounds in response to treatment. [0004] While the open structure of the porous wound contact laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/00A61F13/02A61M1/00
CPCA61F13/00068A61F13/0216A61L15/40A61L15/64A61L15/24A61L15/425A61L15/26A61L15/225A61F13/0253A61F13/0289A61F13/00063C08L75/04C08L29/04C08L93/00C08L23/22A61F13/00008A61M1/92A61M1/915A61M1/985A61F13/0263
Inventor D·阿塞菲A·T·乔西I·T·T·马森B·R·沃德
Owner AROA BIOSURGERY LTD
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