Peristaltic hose pump

Abstract

The invention concerns a peristaltic hose pump comprising a roller wheel ( 1 ) rotatable about a roller wheel axis (D), which roller wheel has rollers that are mounted thereon ( 2 ), the roller wheel rotation axes (R) of which are arranged on a circle concentric with the roller wheel axis (D), the rollers ( 2 ) partly projecting beyond the roller wheel ( 1 ), comprising a hose ( 3 ), which has a flexible and elastic pump segment ( 4 ), and the pump segment ( 4 ) being fixable in the axial direction at its two opposite ends ( 5, 6 ) by means of one fixing point (P 1 , P 2 ) each, and the pump segment ( 4 ) being guided around the roller wheel ( 1 ) under elastic tension, wherein the length (L 1 ) of the pump segment ( 4 ) when not under tension in proportion to the distance (A) of the fixing points (P 1 , P 2 ) to the roller wheel rotation axis (D) is adjusted with the provision that while the roller wheel ( 1 ) is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end (P 1 , P 2 ) of the pump segment ( 4 ), a flow of the fluid of at least 0.01 1/min through the pump segment ( 4 ) is obtained.

1 . A peristaltic hose pump comprising a roller wheel rotatable about a roller wheel axis (D), which roller wheel has rollers that are mounted thereon, the roller wheel rotation axes (R) of which are arranged on a circle concentric with the roller wheel axis (D), the rollers partly projecting beyond the roller wheel,
 comprising a hose, which has a flexible and elastic pump segment,   and the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point (P 1 , P 2 ) each,   and the pump segment being guided around the roller wheel under elastic tension, wherein the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis is adjusted with the provision that while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end (P 1 , P 2 ) of the pump segment, a flow of the fluid of at least 0.01 1/min through the pump segment is obtained.   
     
     
         2 . The peristaltic hose pump according to  claim 1 , wherein the distance of at least one fixing point to the roller wheel axis is adjustable. 
     
     
         3 . The peristaltic hose pump according to  claim 1 , wherein while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min is obtained. 
     
     
         4 . The peristaltic hose pump according to  claim 1 , wherein a bypass line with a pressure-controlled bypass valve is arranged between the regions of the ends of the pump segment. 
     
     
         5 . The peristaltic hose pump according to  claim 4 , wherein the bypass valve opens at a pressure from 100 to 500 mbar, preferably 200 to 400 mbar, most preferably 300 to 350 mbar. 
     
     
         6 . The peristaltic hose pump according to  claim 4 , wherein the minimum clear cross-section of the bypass line with opened bypass valve is 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension. 
     
     
         7 . The use of a peristaltic hose pump according  claim 1  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         8 . The use of a peristaltic hose pump according to  claim 7 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. 
     
     
         9 . The peristaltic hose pump according to  claim 2 , wherein while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min is obtained. 
     
     
         10 . The peristaltic hose pump according to  claim 5 , wherein the minimum clear cross-section of the bypass line with opened bypass valve is 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension. 
     
     
         11 . The use of a peristaltic hose pump according  claim 2  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         12 . The use of a peristaltic hose pump according  claim 3  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         13 . The use of a peristaltic hose pump according  claim 4  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         14 . The use of a peristaltic hose pump according  claim 5  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         15 . The use of a peristaltic hose pump according  claim 6  for generating a fluid flow through a medical instrument  11 , wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. 
     
     
         16 . The use of a peristaltic hose pump according to  claim 11 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. 
     
     
         17 . The use of a peristaltic hose pump according to  claim 12 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. 
     
     
         18 . The use of a peristaltic hose pump according to  claim 13 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. 
     
     
         19 . The use of a peristaltic hose pump according to  claim 14 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. 
     
     
         20 . The use of a peristaltic hose pump according to  claim 15 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.