Apparatus for artificial respiration or narcosis

Claim 2

An insufflation apparatus for performing artificial respiration in narcosis, which apparatus includes pumping means for moving gas from a gas source to a patient, the pumping means having a gas containing portion defined by enclosing walls, inlet means on said pumping means for connecting the latter to a gas source and including check valve means for preventing back flow of the gas from the pumping means to the gas source, and outlet means on said pumping means connecting the pumping means to the air ducts of a patient including check valve means for preventing gas from flowing from the air ducts of the patient into the pumping means, said outlet means including an outlet conduit, the improvement which comprises: a first wall section and a second wall section forming the walls of the gas containing portion of the pumping means, said first wall section consisting of a membrance that is more resilient than said second wall section, said membrane forming a portion of the wall of said outlet conduit and being disposed between said check valve means of said outlet means and said second wall section, said membrance being movable between an unexpanded position when the gas pressure in the pumping means is below a predetermined pressure and, under the influence of the gas when the pressure thereof exceeds said predetermined pressure, an expanded position, said membrane thus constituting a means for increasing the volume of the gas containing porTion of the pumping means, in consequence of which the pressure of the gas in the pumping means is limited to said predetermined pressure.

Claim 3

The improvement defined in claim 1, wherein said membrane forms an end closure of a short branch of said outlet conduit.

Claim 4

The improvement defined in claim 1, wherein said first and second wall sections are integrally connected to each other.

Claim 5

In insufflation apparatus for performing artificial respiration in narcosis, which apparatus includes pumping means for moving gas from a gas source to a patient, the pumping means having a gas containing portion defined by enclosing walls, inlet means on said pumping means for connecting the latter to a gas source and including check valve means for preventing back flow of the gas from the pumping means to the gas source, and outlet means on said pumping means connecting the puming means to the air ducts of a patient including check valve means for preventing gas from flowing from the air ducts of the patient into the pumping means, the improvement which comprises: a first wall section and a second wall section forming the walls of the gas containing portion of the pumping means, said first wall section consisting of a membrane that is more resilient than said second wall section and that is movable between an unexpanded position when the gas pressure in the pumping means is below a predetermined pressure and, under the influence of the gas when the pressure thereof exceeds said predetermined pressure, and expanded position, said membrane thus constituting means for increasing the volume of the gas containing portion of the pumping means, in consequence of which the pressure of the gas in the pumping means is limited to said predeterined pressure; said pumping means including a bladder which is gas-impermeable, said bladder being connected between said inlet and outlet means, said bladder being compressible under applied force to expel gas through said outlet means and being self-expanding from a compressed position to draw gas into said pumping means through said inlet means during a cycle of operation, said bladder having a double wall including an inner wall formed by said second wall section and which is compressible and self-expanding from a compressed position, said membrane forming an outer wall which is gas-impermeable and encompasses said inner wall, said inner wall and said outer wall being connected to each other only at spaced apart positions between said outlet means and said inlet means, and there being channels for gas extending through said inner wall.

Claim 6

In insufflation apparatus for performing artificial respiration in narcosis, which apparatus includes pumping means for moving gas from a gas source to a patient, the pumping means having a gas containing portion defined by enclosing walls, inlet means on said pumping means for connecting the latter to a gas source and including check valve means for preventing back flow of the gas from the pumping means to the gas source, and outlet means on said pumping means connecting the puming means to the air ducts of a patient including check valve means for preventing gas from flowing from the air ducts of the patient into the pumping means, the improvement which comprises: a first wall section and a second wall section forming the walls of the gas containing portion of the pumping means, said first wall section consisting of a membrane that is more resilient than said second wall section and that is movable between an unexpanded position when the gas pressure in the pumping means is below a predetermined pressure and, under the influence of the gas when the pressure thereof exceeds said predetermined pressure, and expanded position, said membrane thus constituting means for increasing the volume of the gas containing portion of the pumping means, in consequence of which the pressure of the gas in the pumping means is limited to said predeterined pressure; said pumping means including a bladder which is gas-impermeable, said bladder being connected between said inlet and outlet means, said bladder being compressible under applied force to expel gas through said outlet means and being self-expanding from a compressed position to draw gas into said pumping means through said inlet means during a cycle of operation, said bladder having a double wall including an inner wall formed by said second wall section and which is compressible and self-expanding from a compressed position, said membrane forming an outer wall which is gas-impermeable and encompasses said inner wall, said inner wall and said outer wall being connected to each other only at spaced apart positions between said outlet means and said inlet means, and there being channels for gas extending through said inner wall.

Claim 7

The improvement as defined in claim 4, wherein said outer wall has a plurality of folds therein.

Claim 8

The improvement as defined in claim 4, wherein said inner wall has a shape of an ellipsoid and said channels are disposed near the vertici of said inner wall.

Claim 9

The improvement as defined in claim 4, wherein said channels are located between the spaced apart positions and provide for a gas flow through said inner wall when the gas is at a pressure above said predetermined pressure.

Claim 10

The improvement as defined in claim 4, wherein said channels are a means for providing a total flow capacity which is sufficient to immediately urge said outer wall to an expanded position when the gas is at a pressure above said predetermined pressure.

Claim 11

In insufflation apparatus for performing artificial respiration or narcosis, which apparatus includes pumping means for moving gas from a gas source to a patient, the pumping means having a gas containing portion defined by enclosing walls, inlet means on said pumping means for connecting the latter to a gas source and including check valve means for preventing back flow of the gas from the pumping means to the gas source, and outlet means on said pumping means connecting the pumping means to the air ducts of a patient including check valve means for preventing gas from flowing from the air ducts of the patient into the pumping means, the improvement which comprises: a First wall section and a second wall section forming the walls of the gas containing portion of the pumping means, said first wall section being an elastic member that is more expandable than the second wall section and that is movable between an unexpanded position when the gas pressure in the pumping means is below a predetermined pressure and, under the influence of the gas when the pressure thereof exceeds said predetermined pressure, and expanded position; said elastic member thus constituting means for incresaing the volume of the gas containing portion of the pumping means, in consequence of which the pressure of the gas in the pumping means is limited to said predetermined pressure; said pumping means including a bladder connected between said inlet and outlet means, said bladder being compressible under applied force to expel gas through said outlet means and being self-expanding from a compressed position to draw gas into said pumping means through said inlet means, said bladder having a double wall including an inner wall formed by said second wall section and which is compressible and self-expanding from a compressed position, said elastic member forming an outer wall which is gas-impermeable and encompasses said inner wall, said inner wall having channels for gas extending through said inner wall.

Claim 12

In insufflation apparatus for performing artificial respiration or narcosis, which apparatus includes pumping means for moving gas from a gas source to a patient, the pumping means having a gas containing portion defined by enclosing walls, inlet means on said pumping means for connecting the latter to a gas source and including check valve means for preventing back flow of the gas from the pumping means to the gas source, and outlet means on said pumping means connecting the pumping means to the air ducts of a patient including check valve means for preventing gas from flowing from the air ducts of the patient into the pumping means, the improvement which comprises: a First wall section and a second wall section forming the walls of the gas containing portion of the pumping means, said first wall section being an elastic member that is more expandable than the second wall section and that is movable between an unexpanded position when the gas pressure in the pumping means is below a predetermined pressure and, under the influence of the gas when the pressure thereof exceeds said predetermined pressure, and expanded position; said elastic member thus constituting means for incresaing the volume of the gas containing portion of the pumping means, in consequence of which the pressure of the gas in the pumping means is limited to said predetermined pressure; said pumping means including a bladder connected between said inlet and outlet means, said bladder being compressible under applied force to expel gas through said outlet means and being self-expanding from a compressed position to draw gas into said pumping means through said inlet means, said bladder having a double wall including an inner wall formed by said second wall section and which is compressible and self-expanding from a compressed position, said elastic member forming an outer wall which is gas-impermeable and encompasses said inner wall, said inner wall having channels for gas extending through said inner wall.

Claim 13

Insufflation apparatus for performing artificial respiration or narcosis, comprising: pumping means, inlet means on said pumping means for connecting the pumping means to a gas source and having valve means for preventing gas flow from the pumping means to the gas source, outlet means on said pumping means for directing gas from the pumping means to a patient and having valve means for preventing gas flow from the patient into the pumping means, said pumping means including a bladder connected between said inlet means and said outlet means and being compressible under applied force to expel gas and self-expanding from a compressed condition to cause gas to be drawn into said bladder, said bladder having a double wall including an inner wall and an outer wall, said inner wall being self-expanding after being compressed and having channels through the wall to permit gas to flow through the inner wall, said outer wall being disposed around the inner wall and being gas-impermeable, said outer wall being formed of an elastic material which is more expandable than the inner wall and which is movable between an unexpanded condition when the gas pressure in the pumping means is below a predetermined pressure and an expanded condition when the gas pressure exceeds said predetermined pressure, whereby said outer wall provides means for increasing the volume of the pumping means when said predetermined pressure is exceeded.

Claim 14

Insufflation apparatus for performing artificial respiration or narcosis, comprising: pumping means, inlet means on said pumping means for connecting the pumping means to a gas source and having valve means for preventing gas flow from the pumping means to the gas source, outlet means on said pumping means for directing gas from the pumping means to a patient and having valve means for preventing gas flow from the patient into the pumping means, said pumping means including a bladder connected between said inlet means and said outlet means and being compressible under applied force to expel gas and self-expanding from a compressed condition to cause gas to be drawn into said bladder, said bladder having a double wall including an inner wall and an outer wall, said inner wall being self-expanding after being compressed and having channels through the wall to permit gas to flow through the inner wall, said outer wall being disposed around the inner wall and being gas-impermeable, said outer wall being formed of an elastic material which is more expandable than the inner wall and which is movable between an unexpanded condition when the gas pressure in the pumping means is below a predetermined pressure and an expanded condition when the gas pressure exceeds said predetermined pressure, whereby said outer wall provides means for increasing the volume of the pumping means when said predetermined pressure is exceeded.

Claim 15

The insufflation apparatus of claim 10 in which said outer wall is provided with a plurality of folds.

Claim 16

The insufflation apparatus of claim 10 in which said inner wall has a shape of an ellipsoid and said channels are disposed near the vertici of said inner wall.

Claim 17

The insufflation apparatus of claim 10 in which said channels are a means for providing a total flow capacity which is sufficient to immediately urge said outer wall to an expanded condition when the gas is at a pressure above said predetermined pressure.

Claim 18

The insufflation apparatus of claim 10 in which the channels are disposed to be located in the inner wall in positions to be free from the outer wall upon desired compression of the bladder so that the outer wall limits the gas pressure in the pumping means to said predetermined pressure.

Claim 19

The insufflation apparatus of claim 10 in which said channels are a means for providing a gas flow capacity which is sufficient to prevent pressure in excess of said predetermined pressure from occurring in the bladder when a high frequency of compression occurs.

Claim 20

The insufflation apparatus of claim 10 in which said channels are a means for providing a gas flow capacity which is sufficient to prevent pressure of gas in excess of said predetermined pressure from occurring in the bladder when an excess amount of gas is introduced through said inlet means into the bladder.

Claim 21

Insufflation apparatus for performing artificial respiration or narcosis, comprising pumping means, inlet means for connecting the pumping means to a gas source and having valve means for preventing gas flow from the pumping means to the gas source, outlet means for directing gas from the pumping means to a patient and having valve means for preventing gas flow from the patient and having valve means for preventing gas flow from the patient into the pumping means, said pumping means having a gas containing portion defined by enclosing walls and connecting said inlet means to said outlet means, said pumping means including a first wall part and a second wall part integrally connected to the first wall part to form a single wall member providing the gas containing portion, said first wall part being compressible under applied force to expel gas and self-expanding from a compressed condition to cause gas to be drawn into said pumping means, said second wall part being formed of an elastic material which is more expandable than the first wall part and is movable between an unexpanded condition when the gas pressure in the pumping means is below a predetermined pressure and an expanded condition when the gas pressure exceeds said predetermined pressure, whereby said second wall part increases the volume of the gas containing portion of the pumping means when said predetermined pressure is exceeded.

Claim 22

Insufflation apparatus for performing artificial respiration or narcosis, comprising pumping means, inlet means for connecting the pumping means to a gas source and having valve means for preventing gas flow from the pumping means to the gas source, outlet means for directing gas from the pumping means to a patient and having valve means for preventing gas flow from the patient and having valve means for preventing gas flow from the patient into the pumping means, said pumping means having a gas containing portion defined by enclosing walls and connecting said inlet means to said outlet means, said pumping means including a first wall part and a second wall part integrally connected to the first wall part to form a single wall member providing the gas containing portion, said first wall part being compressible under applied force to expel gas and self-expanding from a compressed condition to cause gas to be drawn into said pumping means, said second wall part being formed of an elastic material which is more expandable than the first wall part and is movable between an unexpanded condition when the gas pressure in the pumping means is below a predetermined pressure and an expanded condition when the gas pressure exceeds said predetermined pressure, whereby said second wall part increases the volume of the gas containing portion of the pumping means when said predetermined pressure is exceeded.

Claim 23

The insufflation apparatus of claim 17 in which the second wall part forms an end wall of the gas containing portion to be free to expand when the gas pressure exceeds said predetermined pressure.

Claim 24

The insufflation apparatus of claim 18 in which the second wall part is thinner than the second wall part to permit the volumetric expansion upon the occurrence of pressure tending to increase the gas pressure in the pumping means beyond the predetermined pressure.