Infusion pump

• US 20020019612A1
• Filed: 08/03/2001
• Published: 02/14/2002
• Est. Priority Date: 08/14/2000
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Watanabe, Takashi, Nakanishi, Masaru
• Granted Patent: US 6,692,241 B2
• Time in Patent Office: Days
• US Class Current: 604/246
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 39/281 Automatic tube cut-off devices, e.g. squeezing tube on detection of air
• CPC Class Codes: A61M 39/287 Wedge formed by a slot having varying width, e.g. slide clamps
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member

Abstract

When a door is opened, a midway part of an infusion tube is temporarily held in a fixed position of a pump body and the door is to be closed, in order to actively prevent the door from being closed if the infusion tube is not properly set in its fixed position, so that a back plate base 132 can be placed in a state of interposition in which the infusion tube is properly held and an immovable state in relation to the door 4 can be ensured, there are provided a stopper member 70 to be shifted in the direction of arrow d1 by a shift energizing force to be placed in a state of engagement with the back plate base 132 when the door is open and a shape 64 provided on the pump body for shifting the stopper member 70 so as to eliminate the state of engagement when the infusion tube 2 is properly held temporarily in said fixed position and the door is shifted to a closed state in relation to the pump body 3.

Claims

1. An infusion pump, in which in order to temporarily hold a midway part of a detachable infusion tube in a fixed position of the infusion pump body and to place the tube in a state of interposition between a plurality of fingers which are individually driven on the outer circumferential face of the infusion tube by a pumping mechanism built into said pump body and a bearing plate with an energizing function provided on a door pivoting on said pump body to be opened and closed, said door is fixed in relation to said pump body to completely hold the infusion tube, and infusion is carried out by pressing said outer circumferential face with said plurality of fingers along with the driving of said pump mechanism, comprising:

a stopper member shifted by a shift energizing force to be placed in a state of engagement with said bearing plate when said door is open in order to place said bearing plate in said state of interposition and in an immovable state in relation to said door; and

a shape provided on said pump body for shifting said stopper member against said shifting energizing force so as to release said state of engagement when the infusion tube is properly held temporarily in said fixed position and said door is shifted to a closed state in relation to said pump body.

2. The infusion pump according to claim 1,

wherein said stopper member has an inclined face for generating a component of force for shifting in said releasing direction by being in frictional contact with another inclined face formed on the back side of said bearing plate and an engaging part to be placed in a state of engagement with the side wall part of said bearing plate, said inclined face and said engaging part being integrally formed, and

said shape generates a component of force for shifting said stopper member in said releasing direction by being in frictional contact with said inclined face.

3. The infusion pump according to claim 1, wherein door stopper members are further provided for braking the opening/closing force of said door and holding the door at a substantially fixed angle in pivot sections to pivot said door for opening from and closing against said pump body.

4. The infusion pump according to claim 1, wherein, among the plurality of fingers of said pump mechanism, they being supposed to be a first finger, a second finger, . . . , and an Nth finger as counted from the upstream side to the downstream side of said infusion, said first finger and said Nth finger are individually driven to fully pressure-close said infusion tube and the other fingers and individually driven not to fully pressure-close said infusion tube, and

said bearing plate is provided with bearing members respectively matching said first finger and said Nth finger, said bearing members being energized by said energizing force of said bearing plate.