CN1222085A

CN1222085A - Sterilization chamber

Info

Publication number: CN1222085A
Application number: CN 97195657
Authority: CN
Inventors: 约兰·帕尔默斯
Original assignee: TSP Medical AB
Current assignee: TSP Medical AB
Priority date: 1996-06-18
Filing date: 1997-06-16
Publication date: 1999-07-07

Abstract

Sterilization chamber for autoclaves and of the type in which the sterilization process incorporates treatment of the goods to be sterilized with alternating temperature and pressure variations, with the pressure varying between overpressure and vacuum suction, and which is provided with a wall structure incorporating an inner wall (3) and an outer wall (2) arranged spaced apart therefrom, whereby an intermediate space (4) is formed between the two walls, whereby said space (4) between the two walls (2, 3), is hermetically sealed off and has a constant, permanent vacuum, which is lower than the lowest treatment pressure which is at hand in the sterilization chamber (1), in order primarily to ascertain that the inner wall (3) is not subjected to an internal subpressure and secondly for contributing to the heat insulation.

Description

Sterilization chamber

The present invention relates to be used for the sterilization chamber of Autoclave, in this sterilization chamber, disinfecting process comprises with transformation temperature and changes pressure to be handled and wants the disinfectant article, pressure is changed between superpressure and negative pressure of vacuum, and this sterilization chamber have settle spaced each other inwall and the such wall construction of outer wall, thereby between two layers of walls, form middle space.

Autoclave be used for to various types of article for example surgical instruments and dental instruments carry out disinfection, thereby these article are heated to higher temperature by water vapour in short-term, be generally the air pressure of 134 ℃ and 2.1 crust.These article also will be under the vacuum condition.

Thereby sterilization chamber will bear the requirement of two contradictions.It must have low thermal capacity (kws/kg degree), low heat conductivity (w/m degree) and if also strong.Because the cause of internal negative pressure, this internal negative pressure must interrelate with the application of vacuum to article and produce, and just requires the wall of sterilization chamber thick, and is wrinkle resistant thereby it can tolerate internal negative pressure.

In order to attempt addressing these problems, before once there was the people in the intermediate spaces between inwall and the outer wall, to settle an insulator, this insulator is as insulator.Relevant with the negative pressure of vacuum that is positioned at the sterilization chamber within the inwall, the pressure in the intermediate spaces also is lowered, and this means the inwall that the high degree of drawing rustless steel of common usefulness is made, and need not to make to such an extent that picture is necessary so thick.Because the pressure in this intermediate spaces between two layers of walls reduces, be associated with negative pressure of vacuum and be not when steam pressure imposes in the sterilization chamber and take place, this means the insulator in the intermediate spaces, its size must reach whole insulator.

Purpose of the present invention, provide the sort of sterilization chamber of mentioning in a kind of foreword, it comes compared with previous possible sterilization chamber, has the thin made inwall of high degree of drawing steel, a simultaneously required on request thick-layer insulant is attenuate also, and this is owing to having a constant vacuum to reach in the space between above-mentioned two walls of chamber, and this vacuum is also low compared with the minimum processing pressure that sterilization chamber will be subjected to, so that at first make inwall not bear internal negative pressure, secondly then help thermal insulation.

Following reference further specifies the present invention with the embodiment that accompanying drawing shows.

This figure shows the section according to the indefiniteness embodiment of a sterilization chamber of the present invention, thereby this chamber shows irrelevantly with vacuum, steam, cooling media or the like.

Sterilization chamber 1 comprises that one deck for example uses the made strong outer wall 12 of structural steel, this chamber is a cylindrical shape in the embodiment shown, its end is partly sealed by a domeshape, with its made inwall of rustless steel, material therefor is obvious more thinner than outer wall, this inwall is housed inside within the outer wall 2, thereby forms intermediate spaces 4 between inwall 3 and outer wall 2.That end of sterilization chamber opening, seating is being on the smooth strong end wall 5 of circle substantially, leave outer end wall 5 one segment distances, is furnished with the thin planar inner wall 6 of one deck, in order to strengthen bearing capacity and insulation power, one deck insulator 7 has been filled in space shown in the embodiment between that end wall 5 and the inwall 6, and it bears negative pressure of vacuum.Between the opening of two containers of sterilization chamber itself, preferably there is a sealing device 8 to be arranged in groove, this device shown in the figure is for having the sealing ring of circular section.

In the intermediate spaces 4 between inwall 3 and outer wall 2, a durable and constant vacuum is arranged usually, when being sealed with related this space of the manufacturing of chamber airtightly, this vacuum can be established to such an extent that reach than the also low degree of minimum pressure (negative pressure), sterilization chamber is inner can to bear this minimum pressure connectedly with the related negative pressure of vacuum of disinfecting process, and this vacuum in the intermediate spaces can really make the inside of inwall 3 will never bear the superpressure that result from inside and outside relevant with the pressure in the intermediate spaces 4, the pressure when promptly also being sterilization chamber inner vacuum negative pressure effectively.Owing to this means that inwall 3 will never bear internal negative pressure, the corrugated inwardly danger of this layer inwall does not just have, and therefore must make quite thinly from intensity aspect inwall 3.On the other hand, because outer wall 2 can be subjected to effect from inside because of Negative Pressure Difference, it must make thicklyer, and this Negative Pressure Difference is present between intermediate spaces 4 and the atmosphere on every side.

Because the space between inwall and

outer wall

3 and 2 has lower negative pressure, whole sterilization chamber will move as same vacuum insulation thermos flask, and it preferably is in and is lower than 10 ^-2Under the pressure state of millibar, this pressure state is only because of being that the result of this coarse vacuum produces good thermal insulation.

Even the inwall of that two-layer bending and

outer wall

3 and 2 and smooth end wall contrast and only bear tensile stress, this end wall also bears bending stress, the intermediate spaces 4 between these crooked wall parts also preferably can have (a not showing) insulator.The adiabator that is adopted itself is verified, they have significantly reduced their heat conductivity in the vacuum of various degree, and the vacuum of various degree is constant existence in space 4.

Can be used as suitable adiabator mentions, MICROTHERM for example, this is a kind of pore type adiabator, or perforated fiber silicate board SUPRATHERM " L ", this plate is sold by the Isoliertechnik GmbH%Co K.G. of a company of Brandenburg (Brandenburger, German place name-translator).Another kind of suitable material can be Bohemian glass scrim BRA-GLA, is also sold by the Isoliertechnik company of Brandenburg.

Because this material is mentioned in the back the highly compressed ability of tolerance is arranged, it can be designed to the screen cloth template, preferably the honeycomb texture form.If the heat conductivity of this material is 0.22w/mk, and if in those holes of honeycomb texture vacuum is arranged, the high-strength structure that heat conductivity is about 0.0022w/mk made with regard to available this material.

In this way and utilize vacuum, wrinkling with the inner wall housing that prevents sterilization chamber, and reach good thermal insulation, sterilization chamber is reached have low heat capacity, well insulated has these an urgent demands of the thin and strong insulator of one deck simultaneously.

Because thermal capacity reduces, desired electric power has also reduced during to heating and cooling.Thereby, the both speed that can accelerate to handle, and can/maybe can reduce to relevant steam generator and the desired size of cooler, if these devices are arranged.

In addition, because short, will reach good insulation performance compared with the sterilization chamber of general type, and need not durable and by the vacuum of gas tight seal according to distance between each layer of sterilization chamber wall of the present invention, in this vacuum, insulating properties are that the thickness of direct and insulator is proportional.

The invention is not restricted to the drawing is shown the reaching its this embodiment that is illustrated of example, but can make various changes and modification in the claim scope of enclosing.

Claims

1. the sterilization chamber that is used for Autoclave, in this sterilization chamber, disinfecting process comprises with transformation temperature and changes pressure to be handled and wants the disinfectant article, pressure is changed between superpressure and negative pressure of vacuum, and this sterilization chamber have settle spaced each other inwall (3) and the such wall construction of outer wall (2), thereby between two layers of walls, form middle space (4), it is characterized in that:

Above-mentioned space (4) between two layers of walls (2,3), sealed airtightly and had a constant and competent vacuum, this vacuum is lower than the minimum processing pressure that exists in the sterilization chamber (1), so that at first really make inwall (3) not bear internal negative pressure, next helps thermal insulation.

2. sterilization chamber according to claim 1 is characterized in that: the intermediate spaces (4) between two layers of walls (2,3), be furnished with the insulator (7) that a buffering is loaded.

3. sterilization chamber according to claim 2 is characterized in that: the insulator (7) of buffering load is fabricated to honeycomb texture.