US 3255677 A
Description (OCR text may contain errors)
June 14, 1966 -5555 3,255,677
RESPIRATION BAG Filed Nov. 26. 1965 FIG. 3b.
INVENTOR Holger Hesse %ymw @i ATTORNEYS United States Patent The present invention relates to an improvement of an artificial respiration bag of a type according to the US. Patent No. 3,009,459. The above-mentioned respiration bag is used in hospitals and, in particular, for
resuscitation treatment of accident victims, drowning persons etc. The said respiration bag has an outer envelope of airtight material and an inner lining or insert of foam rubber or other porous and resilient material. If squeezing pressure is relieved from such a bag after the bag has been compressed, due to the resilient and porous insert, the bag assumes the shape and size which it had prior to compression and in doing so aspires air through an inlet valve. Upon renewed compression of the bag by squeezing for example, this air passes through an outlet valve to be supplied to the patient.
A bag of the above-mentioned type offers the advantage that repeated compression over a longer period of time will not tire the hand of the person performing the treatment to the same extent as handling a bag not having such-porous and resilient insert would. This desirable result is due to the fact that the outer wall of such a bag without a porous and resilient insert must be given a greater strength to provide a degree of elasticity suffieient to cause the bag to re-expand after release of compression. In comparison to such a bag, a'bag having a resilient and porous lining offers the further advantage that due to the thinner outer skin the person performing the treatment will feel obstructions present in the respiratory ducts of the patient.
In some cases, after an extended time of use of artificial respiration bags provided with a porous and resilient lining, there may be some risk that during compression of the bag the inner walls of the lining composed of foam rubber are rubbed against each other in such a way that particles are detached from the inner walls thus causing the foam rubber lining to be progressively destroyed. As a remedy against this deterioration the foam rubber bodies of the respiration bag are suitably coated on the inner surface and possibly also on the outer surface by a thin rubber skin. However, there is some risk that such a rubber skin, in particular one provided on the inner wall of the lining, will be torn when the bag is used in a moist condition, for example after washing or disinfection by means of a liquid solution whereby the bag will become unusable.
This latter defect can be avoided in such a way that at least the inner wall of the foam rubber lining is coated with a rubber skin which is provided with folds, wrinkles or corrugations enabling the wall to resist the strains occuring during a compression of the bag and its 'subsequent re-expansion and tension without the formation of fissures or cracks in the skin. In the preceding as well as in the following parts of the present specification the skin provided on the foam rubber lining will be designated a rubber skin although the skin may be made of various synthetic elastomer substances as well as of natural rubber. Skin formed of neoprene offers particular advantages due to the great chemical and physical resistivity of this material.
The invention will be explained in greater detail by reference to the attached drawings in which FIGURE 1 shows a respiration bag with an air inlet valve and an air outlet valve, the latter being adapted to be provided Patented June 14, 1966 with a breathing mask, this figure being partly in section. FIGURE 2 shows the two halves of the respiration bag before they have been connected to each other. FIG- URES 3a and 3b are sectional views of the foam rubber lining coated with the rubber skin before compressing the bag and during the compression of the bag. FIGURE 30 is a sectional view thereof showing the outer lining surface being coated.
An artificial respiration bag 1 constructed in accordance with the present invention is provided with a foam rubber lining'2 within an outer envelope 3. Extending through the lining and envelope in air-tight engagement therewith are an air inlet valve 4 and an air outlet valve 5, the latter being adapted to be provided with a breathing mask 6 (FIG. 1). At least on the inwardly facing side the foam rubber lining 2 is coated with a folded, wrinkled or corrugated 7 skin 8 (FIG. 2). A similar skin may also be provided on the outer face. Compression of the envelope 3 and lining 2 will cause the surface area of the skin 8 provided on the inner face of the lining to be increased, such increase however, being accommodated by opening of the folds 7 .or flattening of the wrinkles and corrugations 7 formed in the skin 8 rather than by tensional stress. The surface area of the inner skin 8 having the folds, wrinkles or corrugations 7 is chosen so that even the greatest deformations during compression and restoration of the bagl will not produce tensional stresses, and thereby the risk of crack and fissure formation in the skin 8, but at most a flattening of the folds, wrinkles or corrugations 7 in a tension-free manner.
In a bag 1 of the type here in question the lining 2 is suitably made in two hemispherical portions (FIG. 2). The folded, wrinkled or corrugated 7 rubber skin 8 is applied to the inner surface of both foam rubber lining 2 halves such as by cementing. Subsequently the two halves of the foam rubber lining are adhered to each other, eg by gluing along the annular end faces 10.
It is also possible to produce the folded, wrinkled 0r foam rubber lining. After reversal of the foam rubber. lining to normal condition with the inner surface again facing inwardly the skin will exhibit folds, wrinkles or corrugations due to the fact that the inner surface of the foam rubber lining has a lesser area than the outer surface. I
If desired, the foam rubber lining may also be provided with a pleated or corrugated outer skin, as shown in FIG- URE 3c. A simple and convenient procedure of providing the foam rubber lining with a folded, wrinkled or corrugated outer skin comprising placing the foam rubber lining half upon a mandrel 11 of somewhat greater dimensions than those of the lining half which is thereby extended and presents an outside surface area 7 greater than the normal outside surface area of the lining half in non-extended condition. A smooth rubber skin 8' applied to the extended outer surface will assume a folded, wrinkled or corrugated appearance as soon as the lining half is removed from the mandrel and its original size thereby restored.
What I claim is:
1. In an artificial respiration bag including an outer airtight flexible envelope and a lining of foam rubber,
the improvement comprising of a coating on at least the innersurface of the lining which coating is folded, wrinkled or corrugated whereby the risk of cracks during the compression and restoration of the bag is eliminated.
2. An artificial respiration bag according to claim 1 in which the lining is coated on the inner surface with a rubber skin.
3. An artificial respiration bag according to claim 1 in which the lining is composed of two hemispherical portions.
4. An artificial respiration bag according to claim 2 in which the rubber skin on the inner surface of the lining is formed of a type of rubber solution having a solvent and which causes such changes as forming of folds,
wrinkles or corrugation of the rubber skin after evapora- 15 tion of the solvent.
5. An artificial respiration bag according to claim 1 in which also the outerside of the lining is coated with a folded, wrinkled or corrugated rubber skin.
References Cited by the Examiner UNITED STATES PATENTS 2,335,139 11/1943 Wright 156-160 2,660,761 12/1953 Peters 156160 2,844,126 7/1958 Gaylord 92 90 10 2,976,888 3/1961 Merriman 92-90 SAMUEL LEVINE, Primary Examiner.
RICHARD B. WILKINSON, MARK NEWMAN,
H. G. SHIELDS, Assistant Examiner.