RESUSCITATOR

Abstract: A resuscitator comprises a manually collapsible air receptacle having an air discharge outlet, tubing sections (15, 16) connected in series and having air inlet means (18) connectible in air passing relation with said receptacle discharge outlet, and an air outlet (19) connectible in air passing relation with a mask (20) to be placed against the patient's face, and first and second flap valves (31, 32) positioned in at least one tubing section so that the first flap valve (31) opens and passes air to said receptacle when the second flap valve (32) is closed, and so that the second flap valve (32) opens and passes air from the receptacle to the mask when the receptacle is squeezed and the first flap valve (31) is closed.

Description: BACKGROUND OF THE INVENTION This invention relates generally to resuscitation of patients, as during heart attacks, shock, fainting, etc.; more particularly it concerns improved apparatus, characterized by high reliability, simplicity of construction, ease of use and safety against infection, and incorporation of multiple safety features. In the past, mouth-to-mouth resuscitation was believed to be necessary to provide required inhalation and exhalation of patients undergoing shock, heart attacks, etc.; however, the risk and danger of infection to the administrator of resuscitation is now recognized as serious, indeed critical, and to be avoided at all times. There is need for a simple, safe and inexpensive resuscitation apparatus that is capable of easy manual use. GB 2145335 discloses resuscitation apparatus in which a squeezable air bag or receptacle supplies air to a face mask, the apparatus including three flap valves which operate to control the flow of air to the air bag, from the air bag to the face mask and from the face mask to the atmosphere. SUMMARY OF THE INVENTION It is a major object of the invention to provide improved apparatus meeting the above need. Basically, the resuscitation apparatus of the invention comprises a manually collapsible air receptacle having an air discharge outlet, first and second tubing sections connected in series and having air inlet means connectible in air passing relation with said receptacle discharge outlet, and an air outlet connectible in air passing relation with a mask to be placed against the patient's face, and first and second flap valves positioned in at least one tubing section so that the first flap valve opens and passes air to said receptacle when the second flap valve is closed, and the second flap valve opens and passes air from the receptacle to the mask when the receptacle is squeezed and the first flap valve is closed, characterised by air pressure responsive indicator means carried by said first section to indicate the extent of pressure build-up between the second valve and said tubing section air outlet, the indicator means including a pressure sensitive part movably carried by said first section, and means indicating the displacement of said part in response to air pressure build-up. As will be seen, the air receptacle typically comprises a bellows that is substantially completely hand-collapsible, so that a minimum size receptacle may be provided. Also, the tubing sections may be simplified in this construction and assembly, by use of first, second and third sections which are T-shaped, and each having a side opening and end openings, the side opening of the second section registered with one end opening of the third section. This also simplifies the flap valve construction in that the first flap valve controls the side opening of the second section, and the second flap valve controls an end opening of the first section that is in registration with the first section. Another, preferred, object is the provision of a re-entrant duct extending into one tubing section and defining an air discharge port that is open to communicate with said air outlet when said second flap valve is closed, the second flap valve including a flap, and said air discharge port being closed by said flap of the second flap valve when said second flap valve is open. A cap may be provided to control escape of air from the re-entrant air discharge duct extending into one tubing section and defining an air discharge port communicating with said air outlet, and a cap controlling escape of air from the re-entrant duct and movable to increase or decrease the effective size of said air discharge port. Finally, an air pressure relief valve may be provided to prevent excess pressure build-up, as will be seen. These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following specification and drawings, in which: DRAWING DESCRIPTION Fig. 1 is a section showing interconnected tubing sections and associated flap valves; Fig. 2 is a perspective view of a collapsible air receptacle connectible to the Fig. 1 tubing sections; Fig. 3 is an end view on lines 3-3 of Fig. 1; Fig. 4 is an enlarged frontal view of a valve flapper; Fig. 5 is a section taken on lines 5-5 of Fig. 4; Fig. 6 is a section showing a modified tubing section; Fig. 7 is a top plan view taken on lines 7-7 of Fig. 6; Fig. 8 is a view showing an alternative collapsible receptacle; and Fig. 9 shows that receptacle in collapsed condition. DETAILED DESCRIPTION In Figs. 1 and 2, a manually collapsible air receptacle 10 has an air discharge outlet 11 attached to a tubing assembly. The receptacle has a bellows-like configuration to be easily hand-held, and collapsed endwise, in a direction indicated by arrow 12. Note accordion-like pleats 10 a . The receptacle may have height "h", length "l", width "w" dimensions for convenient hand manipulation about as follows: h = height 4 inches (10.16 cm) l = about 4 inches (10.16 cm) w = about 4 inches (10.16 cm) Almost complete collapse of the receptacle can thereby be achieved. The tubing assembly includes first, second and third tubular sections 15, 16 and 17, joined together in series, as shown. They define air inlet means, as at 18, connectible in air passing relation with the receptacle outlet 11, and an air outlet 19 connectible in air passing relation with a mask 20 configured to be placed against the patient's face 21, for supplying air to the patient as via his nose 22, for resuscitation. As shown, tubular section 15 is elbow shaped, and has tubular legs 15 a and 15 b ; and sections 16 and 17 are alike and have tee shape. Their likeness enables reduction in molding costs, all sections consisting of molded plastic, for example. Section 16 has tubular legs 16 a and 16 b , and tubular stem 16 c , leg 16 a having telescopic interfit at 24 with leg 15 b . Section 17 has tubular legs 17 a and 17 b , and tubular stem 17 c . Leg 17 a has telescopic interfit at 25 with stem 16 c . Thus, the side opening of second section 16 defined by stem 16 c registers with the end opening 26 defined by leg 17 a of third section 17. The telescopic interfits at 24 and 26 may be suitably bonded together to provide rigid connections. Also provided are first and second flap valves generally indicated at 31 and 32, and positioned in at least one tubing section, so that the first flap valve 31 opens and passes intake air to the receptacle to inflate same when the second flap valve is closed; and so that the second flap valve 32 opens and passes air from the receptacle (upon squeezing thereof) to the mask 20 via outlet 19, and while flap valve 31 is closed. In this regard, the flap valves typically include normally closed, like flaps 31 a and 32 a , flap 32 a illustrated in the closed position in Fig. 1, and flap 31 a illustrated in open position in that view. Figs. 4 and 5 show flap 32 a as having an anchor 35 penetrating and cemented to wall portion 36 of tubular section 16; a thin cantilever flat spring arm 37, and a disc 38 carried by the arm and annularly tapered at 38 a to fit its annular seat 32 b in wall 39, when the valve is closed. Valve flapper 31 a is similarly configured, with parts 40, 41, 42 and 43 corresponding to parts 35, 37, 38 and 39. The flapper may consist of DELRIN plastic material, for example. When the receptacle 10 is allowed to expand (after its forcible compression) inflating air enters side inlet 45 in section 17, opens flap valve 31, and flows to the receptacle as indicated by arrow 46. At this time, flap valve 32 is closed. When the receptacle is squeezed, flap valve 31 closes, and valve 32 opens to pass air to outlet 19 and to the mask 20 to resuscitate the patient. Air pressure indicator means may be carried by the tubular section assembly, to indicate the extent of pressure build-up between valve 32 and outlet 19. In the example shown in Fig. 1, the indicator comprises a movable pressure sensitive part in the form of a balloon membrane 50 exposed to the interior 51 of the elbow, an an indicator such as a slider 52 attached to the membrane. Increased pressure at 51 expands the membrane 50 to the left in Fig. 1, pushing the slider 52 to the left. A visible indication of pressure increase is thereby achieved, and indicia on the slider retainer 53 may indicate the degree of pressure increase, on a marker as the slider moves past the indicia. In Figs. 6 and 7, the indicator takes the form of a plunger 56 slidable in a bore 57 formed by an insert 58 attached to the elbow. The extent of plunger travel to the left, resisted by a spring 59, indicates the extent of pressure build-up at 51. A safety valve may be provided to allow escape of excess pressure so that urging to the lungs of a patient may be prevented. As shown, a check valve part 60 is spring urged at 61 to close outlet 62. Part 60 is pushed open by excess air pressure to allow air escape. Also shown in Fig. 1 is a re-entrant duct 70 extending into leg 15 b of section 15. It defines an air discharge port 71 that is open to communicate with the air outlet 19 upon exhalation by the patient, flap valve 32 then being closed against seat 32 b . Exhaled lung air then escapes via duct 70. Alternately, port 71 is closed by flap 32 a when the second flap valve 32 is open, to allow air to flow from the squeezed receptacle to the mask 20. Flap 32 a thus performs two functions. Note that air may flow about the re-entrant duct in each position of the flap 32 a , for minimum flow restriction. In Figs. 6 and 7, an enlarged cap 80 controls the effective size of discharge port 71, by controlling the escape of air from the re-entrant duct 70. To this end, the cap 80 fits annularly over an annular neck 81 on the leg 16 b ; and the cap has an opening 82 thereon that variably registers with the duct 70 as the cap is rotated on the enlarged neck. This serves as a control for air escape upon natural exhalation by the patient, so that positive end expiratory pressure (PEEP) may be achieved if desired. In Fig. 1, a source of oxygen 90 may be connected with the inlet 45, so that supplied O₂ enters via inlet 91 for flow to the receptacle and reservoir tubing 92, and later to the patient. An oxygen flow rate of as little as 8 liters per minute will supply 100% oxygen to the patient. Fig. 8 shows an alternative conically shaped receptacle 110, for air or oxygen, for use in place of receptacle 10. Its pleats 111 allow its complete endwise collapse, manually, as shown in Fig. 9. Thus maximal air discharge is achieved; and also high compactness is achieved for storage, as in a user's pocket. See part 11.

Claims: A resuscitator comprising a manually collapsible air receptacle (10) having an air discharge outlet (11), first and second tubing sections (15, 16) connected in series and having air inlet means (18) connectible in air passing relation with said receptacle discharge outlet (11), and an air outlet (19) connectible in air passing relation with a mask (20) to be placed against the patient's face, and first and second flap valves (31, 32) positioned in at least one tubing section (16) so that the first flap valve (31) opens and passes air to said receptacle (10) when the second flap valve (32) is closed, and the second flap valve (32) opens and passes air from the receptacle (10) to the mask (20) when the receptacle is squeezed and the first flap valve (31) is closed, characterised by air pressure responsive indicator means carried by said first section (15) to indicate the extent of pressure build-up between the second valve (32) and said tubing section air outlet (19), the indicator means including a pressure sensitive part (50 or 56) movably carried by said first section, and means indicating the displacement of said part in response to air pressure build-up. A resuscitator as claimed in claim 1, wherein said air receptacle comprises a bellows (10, 110) that is substantially completely collapsible. A resuscitator as claimed in claim 1, wherein said one tubing section is an elbow. A resuscitator as claimed in claim 1, wherein said part comprises a balloon (50) or a plunger (56). A resuscitator as claimed in any preceding claim, including said mask (20) attached to said first section at said air outlet end thereof. A resuscitator as claimed in any preceding claim, including a re-entrant duct (70) extending into one tubing section (15) and defining an air discharge port (71) that is to communicate with said air outlet (19) when said second flap valve (32) is closed, the second flap valve including a flap (32a), and said air discharge port (71) being closed by said flap (32a) of the second flap valve when said second flap valve (32) is open. A resuscitator as claimed in claim 1, including a third tubing section (17), the second (16) and third (17) sections being T-shaped and each having a side opening and end openings, the side opening of the second section (16) registered with one end opening of the third section (17). A resuscitator as claimed in claim 7, wherein the first flap valve (31) controls the side opening of the second section (16), and the second flap valve (32) controls an end opening of the second section that is in registration with the first section. A resuscitator as claimed in claim 7, including a source of oxygen (90) in communication with the third section (17) via its side opening (91) or its other end opening (92). A resuscitator as claimed in claim 1, including a re-entrant air discharge duct (70) extending into one tubing section (15) and defining an air discharge port (71) communicating with said air outlet (19), and a cap (80) controlling escape of air from the re-entrant duct and movable to increase or decrease the effective size of said air discharge port. A resuscitator as claimed in claim 2, wherein the bellows (110) has conical shape, enabling substantially complete, endwise, manually effected collapse, in use, and also for storage.

Inventors: BAUMAN, JACK
Applicants: BAUMAN, JACK
Application year: 1987
Main classification: A61M16
IPC codes: A61M16