Hydrogel Self-Powered Pump for Preventing Blood Flowing Back

20091810 김영완

20091855 장욱일

20101899 장수영

20101885 이원진

Patients on ringer drip usually experience blood flow backward along a tube.

It doesn’t dangerous, but, If this condition maintains more than a minute, The tube must be replaced because of coagulation( 응고 ) and contamination.

1.Problem

It causes to inject ringer, again

Another inconvenience is patients must use long and heavy ringer stand. It is uncomfortable in toilet, and outside

1.Problem

H = 50cm

Blood Pressure in vein: 7mmHg~14mmHg

H

1.Problem – Ringer injection mechanism

Hydrostatic Pressure

Blood Pressure in vein

Blood Flowing back conditions

1.H is shorter than 20cm2.Temporal blood pressure increase because of patients movements

1. Make pressure Supporting device to prevent blood flow back

2. Objective

1. Make pressure Supporting device to prevent blood flow back

2. Stick Ringer pack on a shoulder, without any stand, supply medicine using pump not gravity.

2. Objective

3. Specific goals – hydrogel pump

1. Operate more than 3hours

2. Making pressure gradient more than 5Kpa

3. Self-Powered

4. Design

펌프의 작동원리는 기본적으로 그림에서 보는 것과 같이 membrane 안에 hydrogel 이 있고 물을 떨어뜨렸을 때 hydrogel 이 팽창하여 채널 속 유체를 밀어내 압력을 가하는 방식이다 . 우리가 만들고자 하는 혈액 역류 방지 펌프에 적용하기 위한 설계는 조금 더 생각해볼 예정이다 .

“A water-activated pump for portable microfluidic applications”, Brian T. Good, 31 August 2006

Use hydrogel

The mechanism of the device is that hydrogel in closed cell push a membrane, when water added

The push makes pressure in a channel

현재 논문으로 밝혀진 hydrogel 을 기반으로 한 microfluidic pump 의 압력범위는 약 1 kPa 에서 부터 10~15kPa 정도의 압력을 내는 것까지 다양하다 . 따라서 , 우리가 제작하려는 역류방지펌프의 압력을 충분히 낼 수 있을 거라고 판단하였다 .

“Micropumps operated by swelling and shrinking of temperature-sensitiveHydrogels” , Andreas Richter, 31st October 2008

According to a Paper below, micro fluidic pump based hydrogel make various levels of pressure .

Small : 1kpaLarge : 10~15kpa

4. Design

Q&A