CN1202577A

CN1202577A - Infusion pump as tube pump

Info

Publication number: CN1202577A
Application number: CN 97112446
Authority: CN
Inventors: 迪特尔·普勒尔
Original assignee: B Braun Melsungen AG
Current assignee: B Braun Melsungen AG
Priority date: 1997-06-12
Filing date: 1997-06-12
Publication date: 1998-12-23

Abstract

The infusion pump comprises a tube being cntinuously flattened by peristaltic pushing members. A reshaping means is provided for reshaping the flattened tube to original form, consisting of two jaws movable in opposite directions. When the peristaltic pushing member is with drawn to the maximum, the reshaping means takes up a closing position, the jaw reshaping the tube to its original cross sectional shape. The reshaping means does not provides any further flattening of the tube.

Description

Infusion pump as tube pump

The present invention relates to a kind of infusion pump as tube pump, it has a pipe and some wriggling thrust piece, and the latter periodically pushes pipe in regular turn.

German patent DE 40 35 182 C1 disclose a kind of syringe pump of such type.This syringe pump comprises many wriggling thrust piece, and it is periodically driven by a camshaft and heads on top platform extruding pipe.The wriggling thrust piece is driven by this pipe again, and this pipe is squeezed continuously, and the liquid that makes wherein to be comprised is wriggled forward along throughput direction.This tubing pump also is referred to as to refer to the formula pump, and its each wriggling thrust piece formation refers to part.

Obviously, move one period long period after, tubing pump has tangible convey error.If the required precision height to feed flow then can not use tubing pump.

German patent DE 29 39 212 C2 disclose another kind of syringe pump, a kind of infusion pump as tube pump, and it has, a pipe; Some wriggling thrust piece, it comes periodically to push in order this pipe by a camshaft actuated; And an apparatus for shaping, it comprises two folder jaws, they can move in opposite directions, and when maximum was arrived in the pumpback of wriggling thrust piece, they reached a closed position.In this syringe pump, one alternatively flattens pipe by a wriggling thrust piece camshaft actuated, that can move along a straight line and reaches and then draw back.The wriggling thrust piece is being controlled an apparatus for shaping that includes two folder jaws, and this folder jaw engage sides pipe.Be controlled to the thrust piece of wriggling apparatus for shaping anti-phase.When the wriggling thrust piece arrived its final position, the place ahead, apparatus for shaping was shown in an open position, and allowed to flatten pipe herein; On the contrary, when the wriggling thrust piece arrived its maximum pumpback position, apparatus for shaping is to contract disturbed the position, and it is being pressed pipe and is crowding around it fully herein.Half place of extensibility before the wriggling thrust piece just, the position that wriggling thrust piece and apparatus for shaping reach makes this pipe present its normal sectional shape.In this manner, pipe is squeezed on two mutual rectangular directions alternately.At each phase place place of pump pressure circuit, it bears dimensional deformation power.Since in tubing pump with quite little many wriggling thrust piece that are arranged at intervals with, and all wriggling thrust piece are all in pump pressure circuit out of phase, so-called Fourth Ring effect (tetra effect) has just taken place, and has wherein had different shapes at synchronization at pipe on the different longitudinal sections under the power effect.This can cause the fatigue of tubing.

(international open day: on June 13rd, 1996) disclose a kind of tubing pump, it also comprised an apparatus for shaping that is made of two folder jaws to patent application WO 96/18038.When the pumpback of wriggling thrust piece was maximum, the folder jaw made apparatus for shaping engage pipe and makes it recover its original contour.When the wriggling thrust piece travelled forward subsequently, the folder jaw was regained from pipe.In this tubing pump, the folder jaw of apparatus for shaping laterally exceeds camshaft.

The purpose of this invention is to provide a kind of more tubing pump of constant delivery flow that has.

The invention provides a kind of infusion pump as tube pump, it has, a pipe; Some wriggling thrust piece, it comes periodically to push in order this pipe by a camshaft actuated; And an apparatus for shaping, it comprises two folder jaws, they can move in opposite directions, and when maximum was arrived in the pumpback of wriggling thrust piece, they reached a closed position, wherein, when apparatus for shaping was in this closed position, it was shaped to normal sectional shape with this pipe and has maximum latus rectum profile.

Syringe pump of the present invention comprises an apparatus for shaping, and it acts on above the pipe, when wriggling thrust piece pumpback, this device along perpendicular to the moving direction of wriggling thrust piece to the pipe shaping.Apparatus for shaping helps the pipe pine to be driven to normal shape, and pipe is just replied its original-shape more quickly and accurately.So just eliminated the fatigue of pipe.In the action next time of wriggling thrust piece, the apparatus for shaping that is used for pipe makes it in a state of nature.In very long inject time, apparatus for shaping makes the injection pipe avoid all flat distortion.This device is to control according to the position of each wriggling thrust piece.Best, for each wriggling thrust piece sets corresponding apparatus for shaping.Yet, if also be enough for example for apparatus for shaping of per two wriggling thrust piece configurations.

After the each run of wriggling thrust piece, pipe is not to recover its original-shape, but get back to the intermediate shape that the pipe contour shape reduces, and this bad pine that can attribute to pipe than mistake of tubing pump feed flow drives, and the present invention just is being based on this understanding.Apparatus for shaping has guaranteed that the pipe profile replys its original-shape after the each run of wriggling thrust piece, yet when the wriggling thrust piece was drawn back, apparatus for shaping just was shaped into its original section shape to pipe, rather than with its flattening.In addition, when unclamping pipe, apparatus for shaping is only engaging pipe, does not also just have permanent stress deformation in the wriggling thrust piece, and pipe can be in the pump pressure circulation be freely determined the shape of himself according to phase place.Only when wriggle complete pumpback of thrust piece and apparatus for shaping are in closed position, just to the pipe reinforcing.The mutual variation of this afterburning action.This means the thrust piece or just apparatus for shaping engages with pipe of just wriggling, rather than both whiles.

In a preferred embodiment of the present invention, apparatus for shaping comprises two folder jaws that can in the opposite direction move, and their working surface adapts to the periphery of pipe.By changing or the folder jaw of resetting, can adapt to the pipe of different-diameter.

Embodiments of the invention are described below with reference to accompanying drawings, in the accompanying drawing:

Fig. 1 shows the local longitudinal section of bright first embodiment's tubing pump;

Fig. 2 is the schematic cross-section along the II-II line of Fig. 1;

Fig. 3 is identical with Fig. 2, and the wriggling thrust piece is in and draws back the dress attitude;

Fig. 4 is second embodiment's cross section, and apparatus for shaping is being opened; And

Fig. 5 is identical with Fig. 4, and apparatus for shaping is closing up.

Tubing pump 10 as shown in Figure 1, it comprises a deformable pipe 11 of being made by the material of PVC and so on, this pipe has circular cross-section in original state.Pipe is the nonrecoverable expendable part that is contained in the syringe pump, and it can be changed by another pipe after using up.In order for example to provide certain parenteral solution to patient in 24 hours with a certain constant as far as possible injection flow one long period, pipe 10 is connecting a liquid, for example an injection container.

Syringe pump 10 comprises some parallel wriggling thrust piece 12, and its head 13 is engaging pipe 11 through a resiliently deformable film 14, thereby this pipe is its original-shape or is compressed flat.Film 14 is consumptive.One drive motor (not shown) is driving a camshaft 15 that is located in the pump seat, and this camshaft comprises some lobe plates 16.Each lobe plate 16 drives a wriggling thrust piece 12.Wriggling thrust piece 12 is by translot guiding moving linearly and be arranged perpendicular to the vertical of pipe 11.Each lobe plate 16 is arranged to according to the order of sequence periodically push-and-pull wriggling thrust piece 12, and pipe 11 approximately press sine function along whole length and is out of shape, and it comprises a conveying chamber VF, and it moves along throughput direction.With the opposite side of wriggling

thrust piece

12,17 supportings of pipe 11 compression plates.

Fig. 2 and 3 illustrates a wriggling thrust piece 12 in its pump pressure position (Fig. 2) with at its withdrawn position (Fig. 3).Each lobe plate 16 that is arranged on camshaft 15 places is meshing the elongated hole 18 of the thrust piece 12 of wriggling, and makes wriggling thrust piece 12 laterally shift to pipe and compress this pipe along direction of advance, makes it be separated from pipe along drawing back direction again subsequently.

One apparatus for shaping 20 acts on the pipe 11, and this apparatus for shaping comprises two

folder jaws

21 and 22, they can perpendicular to pipe 11 vertically and the moving direction of wriggling thrust piece 12 and moving along as shown in the figure the direction of arrow,

folder jaw

21 and 22 motion are antithesis.At pump pressure position (Fig. 2),

folder jaw

21 and 22 is removed and is decontroled pipe 11, heading on pressing plate 17 by creeping type pressure piece 12 flattens this pipe, withdrawn position at creeping type pressure piece 12,

folder jaw

21 and 22 is close mutually, but still keep certain distance each other, make it recover circular so that pipe from two opposition side roof pressures.

Folder jaw

21 and 22 mutually facing to working surface 23, its shape is adapted to the periphery of the pipe 11 that pine drives out.As shown in Figure 3, in the shaping process, folder jaw 21 does not contact mutually with 22, makes pipe 11 be its interference-free original-shape but its distance remained.

Folder jaw 21 and the 22 controlled motion synchronised that become with corresponding wriggling thrust piece 12 are when wriggling thrust piece 12 is in the pump pressure position its (Fig. 2) in opened condition; It is closed state (Fig. 3) when wriggling thrust piece 12 is in retracted position.

Best, each wriggling thrust piece 12 is equipped with an apparatus for shaping 20.

Test shows that syringe pump of the present invention can keep very little convey error.

Figure 4 and 5 illustrate another embodiment of the present invention.In this case, wriggling thrust piece 12 is also driven by a lobe plate 16, and the latter is arranged on the camshaft 15 and is meshing the elongated hole 18 of the thrust piece 12 of wriggling.Wriggling thrust piece 12 is done straight line motion by a linear guide 30 guidings perpendicular to pipe 11.For each

folder jaw

21 and 22 is provided with axle 31 and 32, this axle is arranged to respect to guide device 30 transfixions and can be rotated around

folder jaw

21 and 22 on linear guide 30.On wriggling thrust piece 12 corresponding elongated hole 33 and 34 are set, axle 31 and 32 passes therethrough, thereby this axle does not disturb the motion of wriggling thrust piece 12.And

folder jaw

21 and 22 is provided with pin 35 and 36, and it is stretched out from each folder jaw.Pin 35 and 36 puts in respectively among the elongated hole 37 and 38 of wriggling thrust piece 12.Elongated hole 35 and 36 is gathered towards the pipe side of part 12.Their formation connection guidings are controlled

folder jaw

21 and 22 and are pivoted around its corresponding 31 and 32.

Folder jaw

21 and 22 is the plates that are parallel to plate-like piece 12.

Fig. 4 illustrates wriggling thrust piece 12 in its position of protracting, and it heads on pressure plate 17 extruding pipes 11 herein.Under this state, elongated hole 37 and 38 fens expenses 35 and 36 and

folder jaw

21 and 22,

folder jaw

21 and 22 is pivoted around its axle 31 and 32, thereby apparatus for shaping 20 is in the open position.

Fig. 5 illustrates wriggling thrust piece 12 and is in withdrawn position, and under this state, elongated hole 37 and 38 is being controlled and sold 35 and 36 and make its move toward one another, is pressed into closed position thereby will press from both

sides jaw

21 and 22, and they are shaped as its original-shape with pipe 11 herein.

Claims

1. infusion pump as tube pump, it has, a pipe (11); Some wriggling thrust piece (12), it comes periodically to push in order this pipe by a camshaft actuated; An and apparatus for shaping, it comprises two folder jaws (21,22), they can move in opposite directions, and when maximum was arrived in the pumpback of wriggling thrust piece, they reached a closed position, it is characterized in that, when apparatus for shaping was in this closed position, it was shaped to normal sectional shape with this pipe and has maximum latus rectum profile.

2. syringe pump as claimed in claim 1 is characterized in that, the folder jaw (21,22) of apparatus for shaping only is positioned at the zone between camshaft (15) and the pipe (11).

3. syringe pump as claimed in claim 1 or 2 is characterized in that, folder jaw (21,22) locates to be suitable for the periphery of loose pipe (11) at its opposed facing working surface (23).

4. as each described syringe pump among the claim 1-3, it is characterized in that folder jaw (21,22) can be pivoted in a plane that is parallel to wriggling thrust piece (12), and by the accurately control of this wriggling thrust piece (12).