Fluid ejection device

Abstract

A fluid ejection device includes a fluid chamber configured to store fluid, a nozzle configured to eject the fluid stored in the fluid chamber, a fluid supply channel connected to the fluid chamber and configured to supply the fluid to the fluid chamber, an air bubbles generating member configured to generate air bubbles in the fluid chamber, and a partitioning wall portion configured to separate the fluid chamber and the fluid supply channel, support the air bubbles generating member. The partitioning wall portion include at least one hole, communicating the fluid chamber and the fluid supply channel. The hole is configured to inhibit backflow during ejection of a jet pulse.

What is claimed is: 
     
         1 . A liquid ejection medical device comprising:
 a liquid chamber configured to store liquid;   a nozzle configured to eject liquid stored in the liquid chamber;   a liquid supply channel connected to the liquid chamber and configured to supply the liquid to the liquid chamber;   an optical fiber configured to transmit light to the liquid chamber to generate at least one bubble in the liquid chamber; and   a partitioning wall provided between the liquid chamber and the liquid supply channel, and configured to support the optical fiber,   wherein the partitioning wall includes at least one hole configured to supply the liquid from the liquid supply channel to the liquid chamber,   wherein a tip portion of the optical fiber projects into the liquid chamber.   
     
     
         2 . The liquid ejection medical device according to  claim 1 , wherein
 a distance between the tip portion and the partitioning wall is 0.5 mm or more.   
     
     
         3 . The liquid ejection medical device according to  claim 2 , wherein
 the distance between the tip portion and the partitioning wall is 5 mm or less.   
     
     
         4 . The liquid ejection medical device according to  claim 1 , wherein
 a distance between the tip portion and the nozzle is 5 mm or more.   
     
     
         5 . The liquid ejection medical device according to  claim 4 , wherein
 the distance between the tip portion and the nozzle is 200 mm or less.   
     
     
         6 . The liquid ejection medical device according to  claim 1 , wherein
 an amount of change of a flow rate to the hole is smaller than an amount of change of the flow rate to the nozzle.   
     
     
         7 . The liquid ejection medical device according to  claim 1 , wherein
 a value obtained by dividing a cross-sectional area of the at least one hole in a cross section of the at least one hole orthogonal to a longitudinal direction of the at least one hole by a length of the at least one hole in the longitudinal direction of the at least one hole is smaller than a value obtained by dividing a cross-sectional area of the nozzle in a plane parallel to the cross section by a length of the nozzle in the longitudinal direction of the at least one hole.   
     
     
         8 . The liquid ejection medical device according to  claim 1 , wherein
 the optical fiber is configured to transmit light of laser.   
     
     
         9 . A surgical apparatus comprising:
 an image pickup device configured to be used for image pickup;   an irradiating portion including a light source;   a forceps port configured to allow passage of a medical tool therethrough; and   a liquid ejection medical device according to  claim 1 .