BRPI0615715A2 - curativo de ferimento independente com microbomba - Google Patents
curativo de ferimento independente com microbomba Download PDFInfo
- Publication number
- BRPI0615715A2 BRPI0615715A2 BRPI0615715-7A BRPI0615715A BRPI0615715A2 BR PI0615715 A2 BRPI0615715 A2 BR PI0615715A2 BR PI0615715 A BRPI0615715 A BR PI0615715A BR PI0615715 A2 BRPI0615715 A2 BR PI0615715A2
- Authority
- BR
- Brazil
- Prior art keywords
- wound dressing
- wound
- micropump
- dressing apparatus
- bed
- Prior art date
Links
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Landscapes
- Health & Medical Sciences (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
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- Otolaryngology (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- External Artificial Organs (AREA)
Abstract
CURATIVO DE FERIMENTO INDEPENDENTE COM MICROBOMBA. A presente invenção refere-se a um aparelho de curativo de ferimento compósito que promove a cura de um ferimento através do uso de um sistema de mícrobomba alojado dentro ou acima de um membro de curativo de ferimento, O sistema de mícrobomba inclui uma bomba em miniatura que aplica uma pressão subatmosféríca ao ferimento para efetivamente aspirar um fluido de ferimento ou exsudato para longe do leito de ferimento, sem a necessidade de uma fonte de vácuo externa incómoda. Daí, o curativo de ferimento e o sistema de microbomba são portáteis, o que permite uma mo- bilidade ao paciente que não está disponível quando uma fonte de vácuo externa é usada. O paciente não precisa ser restringido por qualquer período de tempo enquanto o exsudato estiver sendo removido do ferimento.
Description
Relatório Descritivo da Patente de Invenção para "CURATIVODE FERIMENTO INDEPENDENTE COM MICROBOMBA".
Referência Cruzada a Pedidos Relacionados
Este pedido de patente reivindica prioridade para e o benefíciodo Pedido de Patente Provisória Ne 60/714.812, depositado no Escritório deMarcas e Patentes U.S. em 6 de setembro de 2006.
Antecedentes
1. Campo Técnico
A presente invenção refere-se a um aparelho para o tratamentode um ferimento aberto e, mais especificamente, refere-se a um curativo deferimento independente com um sistema de microbomba o qual aspira flui-dos de ferimento para uma zona de vácuo do curativo para facilitação doprocesso de cura do ferimento.
2. Descrição da Técnica Relacionada
O fechamento de um ferimento envolve a migração de tecidoepitelial e subcutâneo adjacente ao ferimento em direção ao centro do feri-mento, até o ferimento fechar. Infelizmente, um fechamento é difícil com fe-rimentos grandes ou ferimentos que se tornaram infectados. Nesses feri-mentos, uma zona de estase (isto é, uma área na qual uma inchaçãõ Iocali-zada de tecido restringe o fluxo de sangue para os tecidos) se forma próximoda superfície do ferimento. Sem um fluxo de sangue suficiente, o epitélio eos tecidos subcutâneos circundando o tecido não apenas recebem oxigênioe nutrientes diminuídos, mas também são menos capazes de lutarem suce-didamente contra uma infecção microbiana e, assim, são menos capazes defecharem o ferimento naturalmente. Tais ferimentos representaram dificulda-des para o pessoal médico por muitos anos.
Os curativos de ferimento têm sido usados na indústria médicapara proteção e/ou facilitação da cura de ferimentos abertos. Uma técnicatem sido usar terapia de pressão negativa, a qual também é conhecida comoterapia de sucção ou vácuo. Uma variedade de dispositivos de pressão ne-gativa foi desenvolvida para permitir que fluidos em excesso de ferimento,isto é, exsudatos sejam removidos, enquanto ao mesmo tempo se isola oferimento para proteção do ferimento e, freqüentemente, afetar o tempo derecuperação. Vários curativos de ferimento foram modificados para promo-ção da cura de ferimento abertos.
Questões que precisam continuamente ser resolvidas quando seusa um curativo de ferimento incluem facilidade de uso, eficiência de cura deum ferimento e uma fonte de pressão negativa constante. Assim, persisteuma necessidade de melhoria constante de curativos de ferimento de pres-são negativa para ferimentos abertos.
Sumário
Em uma modalidade preferida, um aparelho de curativo de feri-mento inclui um membro de curativo de ferimento dimensionado para posi-cionamento em relação a um leito de ferimento e um sistema de microbom-ba. O sistema de microbomba inclui uma microbomba para aplicação deuma pressão subatmosférica a pelo menos o membro de curativo de feri-mento para facilitação da remoção de fluido do leito de ferimento. A micro-bomba preferencialmente é montada em relação ao membro de curativo deferimento. A microbomba preferida é adaptada para produzir uma pressãosubatmosférica que varia entre em torno de 20 mmHg e em torno de 500mmHg.
O sistema de microbomba pode incluir um meio de controle paracontrole da operação da microbomba. O sistema de microbomba ainda podeincluir um sensor de pressão adaptado para detectar a pressão em uma lo-calização predeterminada em relação ao membro de curativo de ferimento eenviar um sinal correspondente para o meio de controle. O meio de controlepode incluir um controlador de motor adaptado para controlar ou variar a sa-ída da microbomba, em resposta à pressão detectada pelo sensor de pres-são. O sistema de microbomba também pode incluir uma fonte de potência,por exemplo, uma bateria, para atuação da microbomba. A bateria pode seradaptada para implantação no membro de curativo de ferimento ou externaao membro de curativo de ferimento. Baterias recarregáveis são divisadas.
O membro de curativo de ferimento preferido inclui um membroinferior posicionável adjacente ao leito de ferimento, um membro absorventesuperior posicionável adjacente ao membro inferior, e um membro de topo. Amicrobomba é posicionada pelo menos parcialmente dentro do membro ab-sorvente superior. O membro de topo é um membro adesivo o qual é adap-tado para ser preso em torno do leito de ferimento ou do perímetro de leitode ferimento para a provisão de um selo entre o membro de curativo de fe-rimento e o tecido circundando o leito de ferimento. O membro inferior podeincluir, pelo menos um, dentre um medicamento, um agente antiinfeccioso,um antimicrobiano, polihexametileno biguanida (a partir deste ponto,"PHMB"), antibióticos, analgésicos, fatores de cura, vitaminas, fatores decrescimento e nutrientes e/ou um dentre um enchimento de microcontase/ou uma espuma absorvente. O membro absorvente superior pode com-preender um material selecionado a partir do grupo que consiste em espu-mas, tecidos compósitos não tecidos, tecidos de celulose, polímeros supe-rabsorventes e combinações dos mesmos.
O membro de topo pode incluir um material oclusivo, o qual podeou não ser transparente. O membro de curativo de ferimento inclui um indi-cador de pressão visual para indicar um nível de pressão dentro do membrode curativo de ferimento. O membro de curativo de ferimento pode incluir umindicador de saturação para a identificação de um grau de saturação domembro de curativo de ferimento. O membro de topo inclui uma porta deacesso associada a ele e é seletivamente móvel entre uma posição fechadasubstancialmente envolvendo o membro de curativo de ferimento e uma po-sição aberta permitindo um acesso interno ao membro de curativo de feri-mento.
Em uma outra modalidade, o aparelho de curativo de ferimentoinclui um membro de curativo de ferimento que inclui um membro absorventeposicionável em relação a um leito de ferimento e um sistema de microbom-ba contido no membro de curativo de ferimento. O sistema de microbombainclui uma microbomba para aplicação de pressão subatmosférica ao leito deferimento para facilitação da remoção de fluido do leito de ferimento e umafonte de potência implantável ou afixável para suprimento de potência à mi-crobomba. O sistema de microbomba inclui meio de controle para controleda operação da microbomba e um sensor de pressão para detecção dapressão em uma localização predeterminada em relação ao membro de cu-rativo de ferimento.
Breve Descrição dos Desenhos
Várias modalidades do presente curativo de ferimento são des-critas aqui com referência aos desenhos, onde:
a figura 1 é uma vista em perspectiva de um curativo de ferimen-to independente e de um sistema de microbomba de acordo com os princí-pios da presente exposição;
a figura 2 é uma vista em corte transversal lateral que ilustra ocurativo de ferimento em um leito de ferimento e em uma condição expandi-da normal na ausência de vácuo;
a figura 3 é uma vista esquemática do sistema de microbomba;
a figura 4 é uma vista similar à vista da figura 2 ilustrando o cura-tivo de ferimento em uma condição contraída quando submetida a umapressão subatmosférica gerada pelo sistema de microbomba;
a figura 5 é uma vista que ilustra a porta de acesso do curativode ferimento em uma condição aberta para se permitir a remoção da cama-da absorvente e/ou do sistema de microbomba;
a figura 6 é uma vista em corte transversal lateral de uma outramodalidade do curativo de ferimento independente e de um sistema de mi-crobomba da presente exposição; e
a figura 7 é uma vista em corte transversal lateral ainda de umaoutra modalidade do curativo de ferimento independente e de um sistema demicrobomba da presente exposição.
Descrição das Modalidades Preferidas
O aparelho de curativo de ferimento compósito da presente ex-posição promove a cura de um ferimento através do uso de um sistema demicrobomba alojado em um curativo de ferimento. O sistema de microbombainclui uma bomba em miniatura que aplica uma pressão subatmosférica aoferimento para efetivamente aspirar o fluido ou exsudá-lo do leito de ferimen-to sem a necessidade de uma fonte de vácuo externa. Daí, o aparelho decurativo de ferimento na forma de um curativo de ferimento e sistema de mi-crobomba é portável, o que permite a mobilidade do paciente que não estádisponível quando uma fonte de vácuo externa é usada. O paciente não pre-cisa ser restringido por qualquer período de tempo enquanto o exsudato es-tiver sendo removido do ferimento.
Com referência, agora, às figuras 1 e 2, o aparelho de curativode ferimento compósito 10 de acordo com uma modalidade preferida da pre-sente exposição é ilustrado na forma de um curativo de ferimento 100 commúltiplas camadas dispostas em relação justaposta ou sobreposta. As múlti-pias camadas incluem, mas não estão limitadas a uma base ou camada infe-rior 102, uma camada de enchimento 104, uma camada absorvente 106, aqual aloja um sistema de microbomba 108, e uma camada de topo aderenteoclusiva 110.
A camada de base 102 está em contato direto com o leito deferimento "w" e pode ser aderente ao tecido ou não aderente. A camada debase 102 tipicamente é porosa. "Não aderente", conforme usado aqui, refe-re-se a um material que não adere a tecidos no e em torno do leito de feri-mento. "Poroso", conforme usado aqui, refere-se a um material o qual con-tém numerosas pequenas perfurações ou poros os quais permitem que flui-dos de ferimento de todos os tipos passem através do material para as ca-madas de curativo acima. A passagem de fluido de ferimento através do ma-terial não aderente preferencialmente é unidirecional, de modo que um ex-sudato de ferimento não flua de volta para o leito de ferimento. Este recursode fluxo direcional poderia ser na forma de aberturas direcionais impressas àcamada de material, uma laminação de materiais de absorção diferente paraa camada de base 102 ou uma seleção de material específica que encorajeum fluxo direcional. Os materiais de fluxo bidirecional também são contem-plados para a camada de base 102 para permitir uma infusão de fluidos me-dicamentosos no ferimento. Os materiais de exemplo usados como a cama-da de base 102 incluem uma camada de contato vendida sob a marca regis-trada XEROFLO® da Kendall Corp., uma divisão da TycoHeaIthcare.
Além disso, agentes tais como hidrogéis e medicamentos pode-riam ser ligados ou revestidos à camada de base 102 para redução de bio-carga no ferimento, promoção da cura e redução da dor associada a trocasde curativo ou remoção. Os medicamentos incluem, por exemplo, agentesantimicrobianos, fatores de crescimento, antibióticos, analgésicos, agentesde remoção de tecido morto, e similares. Mais ainda, quando um analgésicoé usado, o analgésico poderia incluir um mecanismo que permitisse a libera-ção daquele agente antes da remoção ou troca do curativo.
A camada próxima à camada de base 102 é a camada de en-chimento 104. Pretende-se que a camada de enchimento 104 absorva ecapture o fluido de ferimento e os exsudatos. Os materiais de exemplo usa-dos como a camada de enchimento 104 incluem o curativo antimicrobianovendido sob a marca registrada KERLIX® da Kendall Corp., uma divisão daTycoHeaIthcare. Aqueles versados na técnica reconhecerão que a camadade enchimento 104 pode ser formada em qualquer formato adequado. Umacaracterística preferida quanto ao formato é que a camada de enchimento104 é adequada para se conformar a um formato em particular do ferimento.
Um uso adicional para a camada de enchimento 104 é diminuir aincidência de infecção no leito de ferimento. Daí, a camada de enchimento104 pode ser tratada com medicamentos. Os medicamentos incluem, porexemplo, um agente antiinfeccioso, tal como um anti-séptico ou um outroantimicrobiano adequado ou combinação de antimicrobianos, polihexameti-Ieno biguanida (a partir deste ponto, "PHMB"), antibióticos, analgésicos, a-gentes de remoção de tecido morto, fatores de cura, tais como vitaminas,fatores de crescimento, nutrientes e similares, bem como uma simples Iava-gem com agentes, tal como uma solução salina isotônica.
A camada próxima à camada de enchimento 104 é a camadaabsorvente 106. A camada absorvente 106 do aparelho de curativo de feri-mento 10 é pretendida para a absorção e a captura de fluido e exsudatos deferimento. A camada absorvente 106 também aloja o sistema de microbom-ba 108. Preferencialmente, a camada absorvente 106 é pré-formada ou con-formada para aceitar o sistema de microbomba 108. Nesse sentido, a cama-da absorvente 106 pode ter uma concavidade ou um recesso 112 para aacomodação do sistema de microbomba 108. Alternativamente, a camadaabsorvente 106 pode ser dobrável, de modo a ser conformada ou formadapara receber e/ou confinar o sistema de microbomba 108. Os materiais ab-sorventes de exemplo incluem espumas, tecidos compósitos não tecidos,tecidos celulósicos, polímeros superabsorventes e combinações dos mes-mos. Preferencialmente, a camada absorvente 106 pode absorver um volu-me substancial de exsudatos, por exemplo, até pelo menos 100 centímetroscúbicos (cm3) ou mais de fluido de ferimento. A camada absorvente 106 po-de incluir múltiplas camadas.
A camada absorvente 106 também pode ser tratada com medi-camentos. Os medicamentos incluem, por exemplo, um agente antiinfeccio-so, tal como um anti-séptico ou um outro antimicrobiano ou combinação deantimicrobianos, polihexametileno biguanida, antibióticos, analgésicos, agen-tes de remoção de tecido morto, fatores de cura, tais como vitaminas, fatoresde crescimento, nutrientes e similares, bem como agentes de lavagem, talcomo uma solução salina isotônica.
A camada absorvente 106 ainda pode incluir um indicador depressão 114 independente do sistema de microbomba 108. O indicador depressão 114 pode ser montado, preso ou embutido na camada absorvente106 ou dentro dos limites do aparelho de curativo de ferimento 10. Alternati-vamente, o indicador de pressão 114 é externo ao curativo de ferimento 100e se comunica com o interior do curativo de ferimento através de um tubo depressão ou similar. O indicador de pressão 114 pode ser na forma de umsensor de pressão comercialmente disponível vendido sob a marca DynamicIP® Pressure Sensores da PCB® Piezotronics. O indicador de pressão 114pode ser codificado por cor, onde uma cor no dispositivo (por exemplo, ver-melho) indica um estado não de vácuo e uma segunda cor (por exemplo,verde) indica um estado de vácuo adequado. A camada absorvente 106 ain-da pode incluir um indicador de saturação 116 montado na ou embutido den-tro da superfície da camada absorvente 106. O indicador de saturação 116pode ser um papel de tornassol, tais como, mas não limitando, PEHANAL®e PANPEHA®, o qual indique para o usuário o nível ou o grau de saturaçãoda camada absorvente 106 com exsudatos e fluidos de ferimento. O indica-dor de saturação 116 ajudará ao usuário na determinação da capacidaderemanescente da camada absorvente 106, ou se a camada absorvente 106precisa de substituição. Embora mostrado como sendo montado na ou em-butido dentro da camada absorvente 106, o indicador de saturação 116 podeser posicionado dentro de qualquer componente do curativo de ferimento100.
Com referência ainda às figuras 1 e 2, a camada de topo ade-rente 110 envolve o perímetro do curativo de ferimento 100 para circundar oleito de ferimento "w" para a provisão de um selo em torno do perímetro doleito de ferimento "w". Por exemplo, o mecanismo de selagem pode serqualquer adesivo ligado a uma camada que circunde o leito de ferimento "w".O adesivo deve prover uma adesão aceitável ao tecido "t" circundando a pe-le do leito de ferimento "w", por exemplo, a área periferimento, e ser aceitá-vel para uso na pele, sem uma deterioração de contato (por exemplo, o ade-sivo preferencialmente deve ser não irritante e não sensibilizante). O adesivopode ser permeável, para permitir que a pele contatada respire e transmitaumidade. Adicionalmente, o adesivo poderia ser ativado ou desativado porum estímulo externo, tal como calor, ou uma dada solução fluida ou reaçãoquímica. Os adesivos incluem, por exemplo, Ultec® Hydrocolloid Dressingou Curagel® Hydrogel da Kendall Corp., uma divisão do TycoHeaIthcareGroup LP.
A camada de topo aderente 110 é preferencialmente na formade uma folha montada próximo da camada absorvente 106. Preferencial-mente, a camada de topo aderente 110 não é ligada à camada absorvente106, para permitir uma fácil substituição da camada absorvente 106. Emuma modalidade preferida, as porções periféricas 11OP da camada de topo110 são ligadas à periferia 102P da camada de base 102 e presas ao tecido"t" em torno do leito de ferimento "w". É antecipado que revestimentos remo-viveis também possam ser usados para proteção da superfície adesiva dacamada de topo 110, antes do uso.
A camada de topo 110 tipicamente é um material flexível, porexemplo, resiliente ou elastomérico, que forma um selo no topo do curativode ferimento 100. Um material flexível de exemplo inclui o curativo total ouparcialmente transparente fabricado sob a marca registrada Polyskin® II pe-la Kendall Corp., uma divisão do TycoHeaIthcare Group LP. O Polyskin® II éum material transparente, semipermeável, o qual permite a passagem deumidade a partir do local do ferimento, e provê uma barreira para micróbiose contenção de fluido. Na alternativa, a camada de topo 110 pode ser im-permeável à umidade. A transparência da camada de topo 110 provê índicesvisuais do status do curativo de ferimento e, mais particularmente, do statusdo nível de saturação das camadas do curativo de ferimento. Mais especifi-camente, a transparência da camada de topo 110 permite que o clínico vejaos respectivos status do indicador de pressão 114 e do indicador de satura-ção 116.
A camada de topo 110 pode incluir uma porta de acesso 118para a provisão de acesso ao interior do curativo de ferimento 100 e/ou aoleito de ferimento "w". A porta 118 poderia ser uma aba integralmente for-mada com a camada de topo 110 ou um componente separado conectado àcamada de topo 110 através de uma articulação ou similar. A porta 118 pre-ferencialmente pode ser selada novamente para manutenção da integridadedo curativo de ferimento 100 e para a provisão de um selo em relação à ca-mada de topo 110. Um meio adequado para selagem de forma liberável daporta 118 inclui um arranjo de encaixe com pressão, um arranjo de lingüetae ranhura, um arranjo do tipo "zip lock®", adesivos, VELCRO® etc. A porta118 preferencialmente provê acesso ao leito de ferimento "w" para permitirque o clínico monitore o status do ferimento, troque a camada absorvente106, troque o sistema de microbomba 108, ou aplique um tratamento médicoadicional ao ferimento, tais como fatores de crescimento, removedores detecido morto ou outros agentes de cura de ferimento, conforme necessário.Uma vez que o procedimento desejado seja completado, a porta 118 seriaselada de novo em relação à camada de topo 110 para manutenção da inte-gridade do curativo de ferimento 100.
Com referência, agora, ao diagrama esquemático da figura 3,em conjunto com as figuras 1 e 2, o sistema de microbomba 108 será discu-tido. O sistema de microbomba 108 inclui uma bomba em miniatura ou mi-crobomba 120 com um comprimento que varia de em torno de 2,54 a 7,62cm (1 a 3") e um diâmetro relativamente pequeno, preferencialmente nãomaior do que em torno de 2,54 cm (1"). A microbomba 120 pode ser qual-quer tipo de bomba que seja biocompatível e mantenha ou aspire níveis devácuo adequados e terapêuticos. A microbomba 120 pode ser embutida nacamada absorvente 106 ou montada na camada 106, ou alternativamenteassociada aos limites do curativo de ferimento 100. "Níveis de vácuo tera-pêuticos", conforme usado aqui, se refere a um nível de vácuo que aspirafluido de ferimento e exsudato para longe do leito de ferimento. Preferenci-almente, o nível de vácuo a ser obtido está na faixa entre em torno de 75mmHg e em torno de 125 mmHg. A microbomba 120 pode ser descartável,removível, reusável e/ou recarregável. Tipicamente, a microbomba 120 éuma bomba do tipo de diafragma ou peristáltico, ou similar, na qual a(s) par-te(s) móvel(is) aspira(m) exsudato para fora do leito de ferimento para o cu-rativo de ferimento pela criação de áreas ou zonas de pressão diminuída,por exemplo, zonas de vácuo com o curativo de ferimento 100. Esta área depressão diminuída preferencialmente se comunica com o leito de ferimento"w" para facilitação da remoção dos fluidos dali e para a camada absorvente106. A microbomba 120 pode ser atuada por quaisquer meios conhecidospor aqueles versados na técnica. Em uma modalidade preferida da presenteexposição, a microbomba 120 é uma bomba peristáltica. Uma microbombaadequada é fabricada pela Piab Vacuum Products em Hingham, MA. Prefe-rencialmente, a bomba peristáltica produz uma pressão subatmosférica vari-ando de em torno de 20 mmHg e em torno de 500 mmHg.
O sistema de microbomba 108 preferencialmente inclui uma fon-te de bateria independente 122, um sensor de pressão ou transdutor 124para monitoração da pressão adjacente à microbomba 120 ou localizaçõesselecionadas deslocadas da microbomba 120, e um meio de regulagem oude controle 126. O meio de controle 126 pode incorporar um controla-dor/acionador de motor 128 incluindo um circuito de processamento e acio-namento para controle ou variação da voltagem de acionamento para o mo-tor da microbomba 120 em resposta à pressão detectada pelo sensor depressão 124. A saída do motor da microbomba 120 pode ser aumentada oudiminuída, ou iniciada ou descontinuada, conforme controlado pelo meio decontrole 126. O sensor de pressão 124 também proveria uma informaçãopara ajudar na detecção de um vazamento no aparelho de curativo de feri-mento 10, se a pressão subatmosférica ótima não fosse obtida. O meio deregulagem ou de controle 126 também pode ter um alarme, tal como um a-larme sensorial visual, de áudio ou tátil (por exemplo, vibratório etc.) paraindicar ao usuário quando condições específicas foram encontradas (porexemplo, o nível de vácuo desejado ou uma perda de vácuo).
O sistema de microbomba 108 preferencialmente é adaptadopara implantação dentro do curativo de ferimento 100, isto é, é uma unidadeindependente implantável. A fonte de bateria 122 e o meio de controle 126podem ser construídos no alojamento da microbomba 120. O sensor depressão 124 pode ser montado na superfície externa do alojamento da mi-crobomba 120 ou se comunicar através de uma janela no alojamento. Osensor de pressão 124 também pode ser deslocado a partir do alojamentoda microbomba 118, por exemplo, embutido na camada absorvente 106, emuma localização deslocada a partir da microbomba 120, e conectado aomeio de controle 126 através de uma conexão elétrica. A microbomba 120 ea bateria 122 podem ser descartáveis ou recarregáveis. Preferencialmente, osistema de microbomba 108 é inteiramente descartável, por exemplo, apósum uso único, e é descartado juntamente com a camada absorvente 106 docurativo de ferimento 100. Alternativamente, o sistema de microbomba 108pode ser removido ou desconectado da camada absorvente 106 e reinstala-do em uma outra camada absorvente 106 para posicionamento dentro docurativo de ferimento 100.
Também é divisado que o sistema de microbomba 108 pode sercontrolado externamente através de um meio transmissor por rádio. Nestamodalidade alternativa, um transmissor de freqüência de rádio (RF) externoou uma antena 130 (mostrada em linha pontilhada na figura 3) pode envi-ar/receber sinais para/de um transmissor receptor 132 associado ao meio decontrole 126 para operação do meio de controle para controle do funciona-mento do sistema de microbomba 108. Alguém versado na técnica pronta-mente pode adaptar o sistema de microbomba 108 para operar através deum meio de freqüência de rádio (RF) remoto. O sistema de microbomba 108pode incorporar um circuito para comunicação com um computador, por e-xemplo, um dispositivo PALM portátil.
Em uso, o curativo de ferimento 100 é posicionado dentro doleito de ferimento "w", conforme mostrado na figura 2. Após isso, a micro-bomba 120 é iniciada para a criação de uma zona de pressão subatmosféri-ca (isto é, um estado de vácuo) dentro do curativo de ferimento 100. A mi-crobomba 120 pode ser iniciada através de um comutador manual associadoao meio de controle 126, ou pode ser iniciada através do sensor de pressão124, o qual detecta a falta de pressão subatmosférica dentro do curativo deferimento 100 e envia um sinal correspondente para o meio de controle 126.
O meio de controle 126, por sua vez, ativa a microbomba 120. Conforme apressão subatmosférica no curativo de ferimento 100 aumenta, a camada detopo 110 colapsa para a posição descrita na figura 4. Uma vez que o níveldesejado de pressão subatmosférica seja obtido, conforme detectado, porexemplo, pelo sensor de pressão 124, o sensor de pressão 124 envia umsinal para o meio de controle 126. O meio de controle 126 pode terminar aoperação da microbomba 120 ou, alternativamente, variar a velocidade ou asaída (por exemplo, diminuir) da microbomba 120. No estado de vácuo, umfluido de ferimento e exsudatos são aspirados para a camada absorvente106 para serem coletados ali. Após um período de tempo, o curativo de feri-mento 100 pode perder seu estado de vácuo, conforme detectado pelo sen-sor de pressão 124. Uma confirmação visual da perda do estado de vácuotambém pode ser avaliada pela visualização do indicador de pressão 114através da camada de topo 110. Quando a perda de um nível de vácuo de-sejado é obtida, o sensor de pressão 124 envia um sinal para o meio de con-trole 126 para ativar ou aumentar a saída da microbomba 120. Este proces-so pode continuar várias vezes durante uma cura de ferimento.Uma vez que a camada absorvente 106 esteja plenamente satu-rada, conforme detectado pela visualização do indicador de saturação 116através da camada de topo 110, a porta de acesso 118 pode ser aberta,conforme mostrado na figura 5. A camada absorvente 106 e o sistema demicrobomba 108 podem ser removidos através da porta. Conforme discuti-do, uma nova camada absorvente 106 e/ou um novo sistema de microbom-ba 108 subseqüentemente podem ser introduzidos através da porta 118 einstalados no curativo de ferimento 100.
A figura 6 ilustra uma modalidade alternativa da presente expo-sição. De acordo com esta modalidade, o curativo de ferimento 200 inclui umenchimento de contas 202, uma camada de contato 204, uma camada capi-lar 206, uma camada de enchimento 208 e uma camada odusiva 210. Oenchimento de contas 202 pode incorporar uma pluralidade de contas anti-microbianas, contas com fatores de crescimento, medicamentos, antibióti-cos, analgésicos, e fatores de cura, tais como vitaminas, fatores de cresci-mento, nutrientes e similares. Estas contas preferencialmente são não ade-rentes e podem ser bioabsorvíveis por um período de tempo predetermina-do. Alternativamente, as contas podem ser não absorvíveis. As contas po-dem ser injetáveis no local do ferimento. Múltiplas aplicações de contas tam-bém são contempladas.
Alternativamente, a camada de contato 204 pode ser similar àcamada de base 102 discutida aqui acima e preferencialmente é porosa. Acamada capilar 206 inclui uma pluralidade de fibras capilares definindo mi-crocanais que permitem um fluxo direcional controlado de um líquido, porexemplo, para permitir uma drenagem dos exsudatos do ferimento. Estescanais formados em folhas, filmes ou tubos podem ser de dimensão unifor-me ou randômicos e se estender ao longo do comprimento da camada. Osmicrocanais desejavelmente permitem um fluxo de fluido em uma direção,isto é, para longe do ferimento para drenagem do ferimento, por exemplo,similar aos filtros de diálise. A camada de enchimento 208 e a microbomba212 são substancialmente similares a suas contrapartes discutidas aqui aci-ma. A camada oclusiva 210 pode compreender um material de silício ou hi-drogel que pode ser aderente no lado de contato de pele e não aderente aolado externo e, preferencialmente, é aderente em ambientes úmi-dos/oleosos. A camada oclusiva 210 também pode ser um material líquidode formação de filme, o qual é distribuído a partir de um mecanismo de as-persão para aplicação sobre o curativo com as mesmas características desuperfície descritas acima. O curativo de ferimento 200 ainda pode incorpo-rar uma janela suplementar 214 para conexão a uma lata de drenagem ex-terna ou tal como um saco de drenagem.
A figura 7 ilustra um curativo de ferimento alternativo 300, o qualincorpora uma espuma biocompatível 302 no lugar da camada de conta. Aespuma 302 pode ser uma espuma resiliente, líquida, absorvente, porosa àbase de polímero. A espuma 302 pode ser um líquido que pode ser distribuí-do, o qual se solidifica pelo menos parcialmente para um arranjo de tipo cris-tal definindo tubos ocos para se permitir a drenagem de exsudatos. A espu-ma 302 é distribuída dentro do leito de ferimento e é potencialmente colapsí-vel para expelir ar a partir dos canais de espuma. A espuma 302 pode seruma espuma hidrofílica expansível, a qual é capaz de absorver fluido a partirde um curativo e manter o leito de ferimento úmido. Os tubos ocos ou vaziosdefinidos pela espuma 302 também provêem um meio para condução deeletricidade, calor, frio e ultra-som. Os tubos ocos ou vazios também provê-em um esqueleto bioativo para crescimento de tecido. O curativo de ferimen-to 300 ainda inclui um saco no estilo de acordeão ou uma lata 304 conecta-do ao interior do curativo 300 através da janela 306. A lata 304 pode sercomprimida para se imprimir energia aos exsudatos de ferimento para dre-nagem do fluido para o saco. Um sistema adequado é mostrado na PatenteU.S. Nq 5.549.584 comumente cedida de Gross, cujo conteúdo inteiro é in-corporado desse modo aqui como uma referência. Uma válvula de uma viapode ser incorporada na janela levando à alta 304, se desejado.
É adicionalmente contemplado que o aparelho de curativo deferimento pode incorporar um meio externo ou aplicações para estimulaçãodo crescimento do tecido e/ou cura. Por exemplo, um transdutor ultra-sônicopode ser incorporado no aparelho de curativo de ferimento para impressãode energia mecânica para o tratamento do tecido, tal como, por exemplo, odirecionamento de energia térmica ou vibratória na área de ferimento e/ou aintrodução de vários fármacos no corpo humano através da pele. Outros ti-pos de sensores também são contemplados para incorporação no aparelhode curativo de ferimento incluindo sensores de oxigênio, produto químico,microbianos, de perfusão e/ou temperatura. A detecção de oxigênio adjacen-te à área de ferimento ajudaria o clínico na determinação do status de curade ferimento. A presença de uma temperatura elevada pode ser indicativa deuma infecção.
Embora a exposição tenha sido ilustrada e descrita, não se pre-tende estar limitado aos detalhes mostrados, uma vez que várias modifica-ções e substituições podem ser feitas, sem se desviar de forma alguma doespírito da presente exposição. Por exemplo, é divisado que o assunto dopedido de patente comumente cedido depositado concorrentemente comeste sob o Certificado de Correio Expresso N- EL 985194508 US, e o qualreivindica prioridade para o pedido provisório N9 60/714.805, depositado em7 de setembro de 2006, e o assunto do pedido de patente comumente cedi-do depositado concorrentemente com este sob o Certificado de Correio Ex-presso Ns EL 879103054 US, e o qual reivindica prioridade para o pedidoprovisório Ns 60/714.912, depositado em 7 de setembro de 2006 (o conteúdode cada pedido sendo incorporado aqui) podem ser incorporados na presen-te exposição. Como tal, modificações adicionais e equivalentes da invençãoaqui mostrada podem ocorrer para pessoas versadas na técnica, usando-senão mais do que uma experimentação de rotina, e acredita-se que todas es-sas modificações e equivalentes estejam no espírito e no escopo da exposi-ção, conforme definido pelas reivindicações a seguir.
Claims (21)
1. Aparelho de curativo de ferimento, o qual compreende:um membro de curativo de ferimento dimensionado para posi-cionamento em relação a um leito de ferimento; eum sistema de microbomba incluindo uma microbomba para a-plicação de pressão subatmosférica pelo menos ao membro de curativo deferimento para facilitação da remoção de fluido do leito de ferimento, a mi-crobomba sendo montada no membro de curativo de ferimento.
2. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 1, em que a microbomba é adaptada para a produção de uma pres-são subatmosférica que varia entre em torno de 20 mmHg e em torno de 500mmHg.
3. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 1, em que o sistema de microbomba inclui um meio de controle paracontrole da operação da microbomba.
4. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 3, em que o sistema de microbomba inclui um sensor de pressão a-daptado para detectar uma pressão em uma localização predeterminada emrelação ao membro de curativo de ferimento, e enviar um sinal correspon-dente para o meio de controle.
5. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 4, em que o meio de controle inclui um controlador de motor adaptadopara controlar ou variar a saída da microbomba em resposta à pressão de-tectada pelo sensor de pressão.
6. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 3, em que o sistema de microbomba inclui uma bateria para atuaçãoda microbomba, a bateria adaptada para implantação dentro do membro decurativo de ferimento.
7. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 1, em que o membro de curativo de ferimento inclui um membro infe-rior posicionável adjacente ao leito de ferimento, um membro absorventesuperior posicionável adjacente ao membro inferior, e um membro de topo.
8. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que a microbomba é pelo menos parcialmente posicionada den-tro do membro absorvente superior.
9. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 8, em que o membro de topo é um membro adesivo, o membro adesi-vo adaptado para ser preso em torno do leito de ferimento para a provisãode um selo entre o membro de curativo de ferimento e o tecido circundandoo leito de ferimento.
10. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que o membro inferior inclui pelo menos um dentre um medi-camento, um agente antiinfeccioso, um antimicrobiano, polihexametilenobiguanida (a partir deste ponto, "PHMB"), antibióticos, analgésicos, agentesde remoção de tecido morto, fatores de cura, vitaminas, fatores de cresci-mento e nutrientes.
11. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que o membro inferior inclui pelo menos um dentre um enchi-mento de microconta e uma espuma absorvente.
12. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que o membro absorvente superior compreende um materialselecionado a partir do grupo que consiste em espumas, tecidos compósitosnão tecidos, tecidos celulósicos, polímeros superabsorventes e combinaçõesdos mesmos.
13. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 12, em que o membro absorvente superior inclui, pelo menos um,dentre um medicamento, um agente antiinfeccioso, um antimicrobiano, poli-hexametileno biguanida (a partir deste ponto, "PHMB"), antibióticos, analgé-sicos, agentes de remoção de tecido morto, fatores de cura, vitaminas, fato-res de crescimento e nutrientes.
14. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que o membro de topo compreende um material transparente.
15. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 14, em que o membro de curativo de ferimento inclui um indicador depressão para indicação de um nível de pressão dentro do membro de curati-vo de ferimento.
16. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 14, em que o membro de curativo de ferimento inclui um indicador desaturação para a identificação de um grau de saturação do membro de cura-tivo de ferimento.
17. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 7, em que o membro de topo inclui uma janela de acesso associada aele e sendo seletivamente móvel entre uma posição fechada substancial-mente envolvendo o membro de curativo de ferimento e uma posição abertapermitindo acesso interno ao membro de curativo de ferimento.
18. Aparelho de curativo de ferimento, o qual compreende:um membro de curativo de ferimento que inclui um membro ab-sorvente posicionável em relação ao leito de ferimento; eum sistema de microbomba contido dentro ou adjacente aomembro de curativo de ferimento, o sistema de microbomba incluindo umamicrobomba para aplicação de pressão subatmosférica ao leito de ferimento,para facilitação da remoção de fluido do leito de ferimento.
19. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 18, em que o sistema de microbomba inclui uma bateria para supri-mento de potência para a microbomba.
20. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 19, em que o sistema de microbomba inclui um meio de controle paracontrole da operação da microbomba.
21. Aparelho de curativo de ferimento, de acordo com a reivindi-cação 20, em que o sistema de microbomba inclui um sensor de pressãopara detecção da pressão em uma localização predeterminada em relaçãoao membro de curativo de ferimento.
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| BRPI0615715A2 true BRPI0615715A2 (pt) | 2011-05-24 |
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- 2006-09-06 CN CN201210229123.3A patent/CN102715984B/zh not_active Expired - Fee Related
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| CN102715984A (zh) | 2012-10-10 |
| US20090264807A1 (en) | 2009-10-22 |
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