US3823707A - Retaining means for sphygmomanometer valve control head - Google Patents

Retaining means for sphygmomanometer valve control head Download PDF

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US3823707A
US3823707A US28914972A US3823707A US 3823707 A US3823707 A US 3823707A US 28914972 A US28914972 A US 28914972A US 3823707 A US3823707 A US 3823707A
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valve
cam
guide element
head
control head
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R Hayes
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Priority to US28914972 priority Critical patent/US3823707A/en
Priority to DE19732345716 priority patent/DE2345716A1/de
Priority to JP10225773A priority patent/JPS4968924A/ja
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
    • A61B5/0235—Valves specially adapted therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7854—In couplings for coaxial conduits, e.g., drill pipe check valves

Definitions

  • the valve head is movable from an upper closed position to a lower open position against the action of an internal spring.
  • the internal chamber of the valve head is narrowed at its upper portion to achieve a wedging fit over the enclosed valve guide, to thereby selectively retain the head in a depressed position from which it can be released by the application of a lateral force by the operator.
  • the downward movement of the head controls the extent of the opening of the valve stem, with a greater downward movement opening the valve stem cavity to a greater degree, thereby permitting the pressurized fluid to escape at a more rapid rate than would be permitted if the valve head were to be able to move downward only a relatively shorter distance.
  • such an arrangement is based on a completely external contact between the head and the cam, and accordingly, this may cause unsightly wear to the valve head.
  • a conventional check valve is illustrated for allowing inflation of a blood pressure cuff in one direction and for preventing the leakage of pressurized fluid in the other direction once inflation has been-achieved.
  • This feature too, is fully operational in the disclosed embodiment. While fulfilling the desired criteria for a check valve, it would be more advantageous for'such a valve to open more readily during'the inflation step, to seal more securely and rapidly when the cuff pressure builds up to a point where it exceeds the inflation pressure being applied and to achieve these advantages'without the need for a spring or other internally contained closing device.
  • valve head retaining means As in the copending application, the valve head is movable along a vertical axis and is normally maintained in an upper position at which point the valve stem, which is coupled to the valve head, completely occupies its valve stem cavity, thereby closing off the valve and preventing any flow of air from the blood pressure cuff out to atmosphere.
  • the valve head may be generally cylindrically shaped, with aflattened side surface in the case of a cylindrical valve head, a typical side surface shape would be a rectangle, formed by the intersection of the cylindrical valve head with a vertical plane.
  • valve head During normal use when blood pressure readings are being taken, the valve head is disposed with its flattened surface away from the underlying cam. This mode of operation causes the valve head, upon depression, to have its bottom surface come into contact with the cam. As the valve head is depressed, its valve stem also moves downward a corresponding distance, thereby opening the valve stem cavity and permitting pressurized fluid to flow from the inflated cuff through the valve body and out to atmosphere through an aperture in the valve head.
  • the valve head is normally maintained in its upper closed position by an internally contained spring, housed in a cavity within the valve head.
  • the spring-contained cavity within the valve head has its upper bore narrowed so that it is formed in a frusto-conical shape.
  • this narrowed bore within the valve head comes into contact with the upper rim of the valve guide, causing a removable yet snug fit for the valve head.
  • the valve head will remain in its wedge contact position with the valve guide under normal conditions without any further intervention by an operator. Deflation thereby occurs without further operator involvement and at a relatively rapid rate.
  • a lateral or rocking action may be applied thereto, and this relatively simple but firm force causes the narrowed bore to be loosened from contact with the upper edge of the valve guide, and the expansion action of the internally contained spring drives the valve head upwards to its normal closed position.
  • the valve stem cavity was fully open, and the pressurized fluid from the inflated blood pressure cuff thereby escapes at a rapid rate through the valve bore, the valve stem cavity, the valve stem passageway, the valve guide and outv to atmosphere through the spring chamber within the valve head. This provides the specified rapid and unattended deflation of the blood pressure cuff.
  • the various presettable rates of deflation are controlled by the setting of the eccentric gripping cam mounted on the valve body. This arrangement is based upon the fact that as the valve head is depressed by an operator, its lower surface will come into contact with the upper edge of the cam after having travelled a distance dependent upon the rotational setting of the cam. The distance which the valve head has travelled controls the opening provided by the valve stem which is coupled to the valve head the greater the distance travelled by the valve head, the greater the opening of the valve stem and the release rate of pressurized fluid.
  • the cam can be rotatably set around the valve body to provide a range of presettable release rates which can accommodate the desires and capabilities of all technicians and operators.
  • the present invention provides for securely retaining the particular presettable value selected by an operator, by utilizing a gripping cam constructed to exert a spring-like force onthe valve body on which the cam is mounted.
  • the cam is designed with a pair of spaced adjustment nodes which have been designed to present an area substantially as large as possible to an operator.
  • the angle of the nodes has also been designed so that when the usual perpendicular force is applied by the operator, it will be in a direction opposite to the line of maximum apparent friction force retarding movement of the cam. This helps the operator to overcome the spring-like force holding the cam in place, allowing an easier adjustment of the cam s rotational position.
  • the adjustment nodes are also designed to occupy the maximum moment arm with respect to the center of rotation of the ring, thereby serving to permit the spring force of the cam to be more easily overcome by the application of pressure to the adjustment nodes.
  • the design of the cam, with the adjustment nodes spaced to form a passageway therebetween, allows for mounting of the ring over the valve body and facilitates installation of the ring in the groove provided therefor on the valve body.
  • the check valve utilized in this invention makes use of the largest cross-sectional area for the bore in the check valve assembly that can be accommodated within the valve design.
  • the employment of this larger bore than previously used will result in the application of a relatively greater force to a larger freely riding self-contained check valve member, due to the principle of force being'equal to the applied pressure multiplied by the area against which the pressure is applied.
  • the new larger check valve member itself can take the form of a disc having a diameter nearly as great as the main portion of the valve body, which freely rides within the check valve cavity.
  • the central bore through the valve body transmits the pressure from the cuff to the enlarged check valve, tending to force it closed.
  • the back pressure applied from the cuff against the check valve member will be exceedingly large, particularly when the pressure in the cuff is high. Accordingly, when the cuff has been suitably inflated to a pressure sufficiently in excess of that at which the pressure release and reading cycles may be commenced, the back pressure applied against the check valve member will be quite high and will securely prevent any of the pressurized fluid from escaping back along the inflation path.
  • the large bore on the inflation side of the check valve member and the absence of any spring minimize operator effort in inflating the cuff.
  • a cam acts as a stop for a movable valve head and retains its rotational positionabout the valve body by spring action unless positively adjusted by an operator;
  • a cam is formed as an open ring to provide for easier mounting on a valve body and for the optimum distribution and direction of applied forces to the ring.
  • an internally narrowed bore of a movable valve head is engaged with a valve guide to provide a secure retaining position to establish a rapid deflation mode of operation, and from which an operator can dislodge the head by lateral movement thereof.
  • a check valve in the inflation path of a pressure control mechanism is made substantially as large in surface area as can be accommodated within a comparably large bore, to provide the greatest force against leakage through the inflation path and at the same time provide for greater ease of inflation operation.
  • FIG. 1 is an overall perspective view of the control mechanism of the invention
  • FIG. 2 is a fragmentary side sectional view of the control mechanism illustrated in perspective in FIG. 1, taken from the perspective of line 2--2 of FIG. 1 in the direction of the arrows;
  • FIG. 2a is a sectional view of the check valve member, taken along the line 2a-2a of FIG. 2 in the direction of the arrows;
  • FIG. 3 is an enlarged fragmentary view of the valve head of the invention rotated to a position where it can be depressed fully into the wedged rapid deflation mode;
  • FIG. 4 is an end view of the valve mechanism, partly in section, illustrating the relationship among the gripping cam, valve body and valve head, taken from the perspective of line 44 of FIG. 1 in the direction of the arrows;
  • valve head to be depressed therethrough without requiring the normal rotation of the valve head
  • FIG. 6 is an end view of the valve mechanism illustrating the relative positions of the cam and valve head shown in FIG. 5;
  • FIG. 7 is an enlarged showing of the illustrative shape of the cam of the invention.
  • valve control arrangement l0 incorporates a vertically movable head 12 which isillustrated as being cylindrical in shape, but
  • valve head 12 On selected downward movements of valve head 12, as will be described below.
  • cam 14 functions to' intercept valve head 12 in its downward movement, by contact between the bottom surface 12a of valve head 12 and the upper edge of cam 14.
  • the extent of the depression of valve head 12 in turn controls the opening of valve stem 28b attached to the valve head, thereby governing the release rate of the pressurized fluid from the blood pressure cuff represented by block 17.
  • valve body 16 he main bore of the valve 10 is contained within valve body 16, and connecting tube 18 links up with blood pressure cuff in conventional fashion. Inflation is provided by means of bulb 22, which is squeezed by the attendant, thereby furnishing air under pressure throughbulb throat 20 and into the main bore through valve body 16. As will be described in greater detail below, the attendant has initially set cam 14 at a rotational position which will establish the distance through wiich'valve head 12 can travel downwardly during the pressure reading cycle as the pressurized air is released from the blood pressure cuff.
  • valve head 12 is depressed against spring 36, thereby causing bottom surface 12a to ultimately come in contact with the upper edge of cam 14 as valve head 12 moves downwardly.
  • the pressurized air is released at the preselected rate from the blood pressure cuff (e.g., block 17), escaping through tube 18, the bore within valve body. 16, through the valve stem passagethrough aperture 38 in valve head 12. As the pressure.
  • the blood pressure cuff e.g., block 17
  • valve head 12 and cam 14 are maintained continuously or only periodically during the reading cycle, the depression of the head into contact with the cam establishes the predetermined rate of release of pressurized fluid selected by the operator in charge of the device. This rate will continue throughout this particular cycle as long as head 12 is in contact with cam 14. This general mode of operation is substantially the same as was described in the previously mentioned copending application.
  • cam 14 not only has a central opening as before, but now is provided with a pair of opposing manipulative surfaces or nodes 14a.
  • the nodes 14a are substantially flattened surfaces which the operator can conveniently manipulate so as to change the rotational setting of cam 14 when desired, by the application of suitable force.
  • the geometry of cam 14 is such that the force applied by the operator to a node is applied in an optimum manner so as to overcome the spring-induced friction forces exerted by the cam in its contact with valve body 16.
  • cam 14 is mounted within a groove therefor in valve body 16.
  • Cam 14 is desirably constructed of spring-type material, which causes it to exert a relatively strong gripping force around valve body 16 after ithas been placed within its accommodating groove.
  • the nodes 140 are substantially aligned with respective radii 14d of cam 14, which is a line from the center of rotation of cam 14 through the point 14d, at which the greatest average friction forces appear to be concentrated this point can be empirically determined.
  • nodes 14a are located so as to provide the maximum moment arm 140 with respect to the center of rotation of the cam, and also to provide the maximum moment arm Me with respect to the gripping forces exerted around valve body 16 by virtue of the spring grip of cam 14.
  • nodes 14a are made long so as to minimize the back pressure created for a given applied force.
  • cam 14 is such that while the gripping forces applied by the cam to valve body 16 will be significant and will be difficult to overcome without an express attempt to do so, the practically compulsory application of force perpendicular to radii 140 along node surfaces 14a, coupled with the maximum moment arms 140 (with respect to the center'of rotation) and 14d (with respect to the spring gripping force), all cooperate to overcome the secure setting of cam 14 and provide adjustment control over the setting of the cam when an operator desires to adjust the setting.
  • the Head Retaining Means My previously mentioned copending application disclosed means for retaining the valve head in its lowermost position to permit an operator to achieve an unattended quick release mode of operation. This would normally be done when the pressure reading cycle has been completed, and there is no longer any need to maintain the blood pressure cuff in its partially inflated condition. In order to permit the cuff and the entire valve device to be ready for the next inflation and pressure reading cycle, the operator will generally want the cuff to be deflated; on the other hand, he will not gen erally want to be involved in the actual release of pressurized air from the cuff.
  • the copending application disclosed a beveled or angular surface cut from the valve head, which surface would be rotated into position over the cam and then wedged into secure contact with the cam, thereby retaining the valve head in its lowermost position.
  • This position corresponded to a large opening of the valve stem, causing pressurized air to be released from the cuff at a fast rate, leading to prompt deflation of the cuff.
  • the present invention includes an improvement over this valve head retaining arrangement.
  • substantially uniform flattened surface 12b is present on one side of cylindrical valve head 12.
  • surface 12b is disposed opposite to the position of cam 14; during such normal use, the depression of valve head 12 will cause it to come in contact with cam 14 as explained above, establishing the predetermined release rate previously set by the particular operator.
  • valve head 12 is rotated on its vertical axis, bringing flattened surface 12b into the position illustrated in FIG. 3.
  • the narrower segment of bottom surface 12a of valve head 12 which had previously been on the side away from cam 14, will be adjacent to cam 14; as shown in FIG. 3 in particular,
  • valve head.12 continues to be depressed, there will be no contact established between surface 12a and the upper edge of cam 14. Instead, head 12 will bypass cam 14 and continue to move downward over underlying valve guide 40.
  • valve head 12 provides a chamber 34 for housing spring 36, which is adapted to be compressed between lower surface 340 (which is actually the upper surface of valve guide 40) and the upper surface 34b of chamber 34 as head 12 is depressed. Chamber 34 is also providd with internal constricted bore 34c, which acts as the engaging means with the upper outer circular'edge 40b of valve guide 40. As shown in FIG. 3, as valve head 12 is depressed beyond theposition at which surface 12a would normally come in contact with cam 14, surface 34c comes into contact with outer rim or edge 40b of valve guide 40. Valve head 12 thereby is releasably engaged with valve guide 40, with sufficient engaging force to overcome the expansion of now-compressed spring 36.
  • head 12 and guide 40 can be achieved by forming the base of guide 40 (where it joins with valvebody 16) with a frusto-conical portion which is contacted by the lower opening of chamber 34 when head 12 is depressed.)
  • valve head 12 The retention position for valve head 12, illustrated in FIG. 3, will be maintained through normal use for so long as it is necessary to permit deflation. Deflation occurs, as shown in FIG. 2, when valve head 12 is depressed and thereby drives valve stem 28, coupled to head 12 by set screw 28a, and its associated enlarged illustratedin FIG. 3. Often, this lateral force will be applied by the attendants use of the thumb and forefinger in an alternating fashion, although-each operator will obviously establish his own method of applying the lateral force to valve head 12 to dislodge it after the unattended deflation cycle has been completed. The dislodging of valve head 12 from the engaged position with valve guide 40 will permit spring 36 to resume control over the vertical position of valve head 12 and 1 will thereupon force valve head 12 upward, back to the position illustrated in FIGS. 1 and 2.
  • the Check Valve Feature During the inflation cycle, it is important for there to be case of inflation for convenience of operation by the attendant; similarly, during the deflation cycle, there is a corresponding need for the inflation cycle not to be reversed,- i.e., that there be security against anyleakage of the pressurized air over the previously used inflation path. This has generally been accomplished in prior art devices, and in the copending application, by a simple check valve which was accommodated within a narrow bore within the valve body.
  • the present invention discloses a substantially larger and 2valve member 46.
  • This member is lodged within a correspondingly enlarged check valve chamber 16d nearly as large in diameter as valve body 16..
  • inflation pressure enters the valve through oversized bore 16a. This causes any given applied pressure to create a greater force against the larger area to the right of check valve member 46.
  • check valve member 46 is generally similar when inflation has been completed, but before deflation has commenced or while it is going on (but between applications of inflation pressure). In particular, it is critical at this time for there tobe no leakage of pressurized air past check valve member 46 and toward inflation bulb 22, which does have access to the atmosphere. Back pressure is applied through bore 16c of valve body 16, and because of the larger area of check valve member 46 provided herein, a larger and substantial force is developed, causing check valve member 46 to be driven to the right in FIG. 2, causing it to come into tight contact with ridge or valve seat 163. This establishes a tight and secure position for check valve member 46 during the pressure reading and deflation cycles, and also minimizing any leakages which might otherwise be caused by the presence of foreign particles between member 46 and seat 16g.
  • cam 14 Setting of cam 14 will depend in large measure on the rate at which the attendant desires pressurized air to be released, and also on the individual dexterity of that particular attendant during the pressure release cycle.
  • the-attendant will set cam 14 by rotating it inits accommodating groove in valve body 16, so as to bring its narrowest portion beneath valve head surface 1211 if a high rate of release is desired, or to bring its widest radial distance beneath valve head surface 12a if a lower release rate is desired.
  • graduated release rates will 'be obtained by varying the rotational setting of cam 14 between these tWO extremes.
  • cam 14 By fabricating cam 14 of suitable spring metal or comparable resilient material, the spring-like gripping forces previously discussed will cause cam 14 to be securely fastened to valve body 16 in its accommodating groove.
  • the cam will be mounted on the valve body 16 with a conventional retaining ring mounting tool.
  • the cam will pass over the valve body 16 by spreading the upper portion of cam 14 with a. retaining ring tool whose jaws have been inserted into holes 14b adjacent to nodes 14a,” cam 14 will then snap into place in'its accommodating groove in valve body 16. Accordingly, the mounting of cam 14 on valve body 16 will have been accomplished easily with a readily obtainable and conventional tool.
  • cam 14 To set cam 14, the attendant applies force substantially in the direction indicated by one of the arrows 15 which is perpendicular to its respective node surface 14a in FIG. 7. This applied force overcomes the existing friction forces and cam 14 can be rotatably adjusted around valve body 16 to establish the particular attendants desired predetermined release rate. By applying the force in the directions indicated, the most effective use of the attendants force will be achieved to overcome the spring-like gripping force applied by the cam 14 to the valve body 16.
  • node surfaces 14a serve as a type of button of maximized area, insofar as they furnish the attendant with a surface against which to apply the adjustmentforce; because of their shape and angle relative to the hypothetical average friction force radius 14d, when force is applied perpendicularly to node surfaces 14a, the adjustment of cam 14 will be readily accomplished by the attendant.
  • the inadvertent application offorce in any other manner e.g., around the outer perimeter of cam 14
  • the dimensions ofthe cam 14 along the variable radii around its perimeter range from the widest dimension X to the narrowest dimension Y. If cam 14 is rotatably set so that dimension X resides immediately beneath valve lead contact surface 12a, then the release rate established when valve head 12 is depressed into contact with cam 14 will be relatively low. If, on the other hand, cam 14 is rotated such that dimension Y is disposed beneath contact surface 12a, then the downward stroke of valve head 12 will be greater and the release rate established by the valve will be correspondingly higher.
  • the release rate selected by a particular operator will depend on how fast he wishes the pressurized air to be released from the cuff, whether the pressure reading cycle is achieved by continuous depression of the valve head 12 in contact with cam 14, or whether the valve head is stepped down, by repeatedly depressing valve head 12 into contact with cam 14 and then releasing it back to its normal position, thereby enabling the attendant to zero in on the critical pressure reading points.
  • the setting of cam 14 illustrated in FIG. 4, for example, is an intermediate position, with the ring being set somewhat closer to its narrowest dimension Y, thereby establishing a relatively high (but not the highest) release rate for the valve.
  • check valve member 46 together with an appropriate accommodating chamber 16d and an enlarged inflation bore 16a, combine to give the operator great ease of inflation and also to more positively prevent the leakage of pressurized air from the cuff as pressure is built up therein.
  • the application of pressure against the right-hand surface of check valve member 46 causes a relatively greater force to be applied to the check valve member in a right to left direction in FIG.
  • the Pressure Reading Cycle whereby the blood pressure cuff would be sufficiently bore 16b and connecting tubing 18, and ultimately arinflated, as also described above, the pressure reading cycle can commence.
  • the invention includes the ca pacity to permit an attendant to continuously reduce the pressure, thereby resulting in a substantially uniform reduction in the pressure in the cuff past the systolic and diastolic pressure points, or the operator can also step down the pressure in discrete and discontinuous steps, permitting under some circumstances a more precise approach to the critical pressure reading points.
  • valve head 12 depresses valve head 12.
  • valve stem 28 which is coupled to the upper portion of valve head 12 by set screw 28a, to be correspondingly depressed.
  • the extent of the depression of valve head 12 in FIG. 2 is represented by the distance L, which is the separation between bottom surface 12a of valve head 12 and the upper edge of cam 14.
  • Valve stem 28, and its enlarged portion-28b will also travel downward by this same distance L. This opens the pressure release path for pressurized air from the blood pressure cuff.
  • the pressurized air can now escape to atmosphere over a path from the cuff, through connecting tubing 18 and into bore 16b, following the path suggested by the dashed arrows at those locations.
  • the air then proceeds through now unobstructed cavity 30 and into the passageway 32 which surrounds valve stem 28 through valve guide 40.
  • the pressurized air emerges into internal spring housing chamber 34, and can now escape to atmosphere through aperture 38.
  • This path will be available as long as valve head 12 is depressed into contact with cam 14. Should the operator release the depression force on valve head 12, spring 36 will return valve head 12 to its normal position illustrated in FIG. 1 and in full line in FIG. 2.
  • valve stem member 2812 This will cause enlarged valve stem member 2812 to return to its full line position in cavity 30, thereby blocking the access of the pressurized air to passageway 32.
  • the return to the original position of valve head 12 could be accomplished during the pressure reading cycle if the operator is steppingdown the pressure so as to zero in" on the critical pressure reading points, or it could be done at the completion of the pressure reading cycle, but prior to the unattended deflation mode to .bedescribed below.
  • the Unattended Deflation Mode Feature When the pressure reading cycle has been completed, the operator will normally pay little attention to the valve device thereafter However, in order to commence a subsequent pressure reading cycle, or perhaps to repeat the pressure reading cycle on the same patient for checking purposes, itis important that all the remaining pressure in the cuff be removed therefrom.
  • the present invention permits an operator to achieve the desired deflation without any significant effort or attention on his part.
  • valve head 12 following the completion of the pressure reading cycle, the operator rotates valve head 12 about its vertical axis, i.e.,
  • valve stem 28 which is rotatable within valve guide 40.
  • valve head 12 After rotating valve head 12 so that flattened surface 12b will be disposed adjacent to, but spaced from, cam 14, as best shown in FIG. 3, the depression of valve head 12 will no longer bring its bottom surface 12a into contact with the upper edge of cam 14.111 stead, valve head 12 will bypass cam 14 on its downward movement. In so doing, the narrowed or frustoconical surface 34c forming the upper portion of the side walls of chamber 34 will come into engaging contact with upper peripheral rim 40b of valve guide 40. Because of the relative geometry of rim 40b and surface 34c, a wedging fit will occur therebetween, as indicated in FIG. 3.
  • valve head 12 in its downward position will continue indefinitely, until an operator takes steps to dislodeg valve head 12. Such dislodging is readily accomplished by the operators applying a lateral or rocking force to valve head. This permits the contact between surface 34c and rim 40b to be disturbed and spring 36 thereby elevates valve head 12 upward to the position illustrated in FIGS. 1 and 2.
  • the added features described in connection with the present invention permit the valve referred to herein to operate efficiently and even more reliably than that disclosed in my copending application.
  • the improvements to the cam insure an ease of mounting as well as a certainty of setting, while still providing a selection of predetermined release rates.
  • the check valve feature relies on an enlarged surface area against which pressure is applied, thereby developing substantial forces against the check valve member during and after inflation. This promotes an ease' of inflation while securely blocking any leakage of pressurized air.
  • the use of an internal narrowed bore in the valve head for contacting the valve guide provides a secure retaining arrangement-for the valve head, and yet permits the operator to readily dislodge the head when desired.
  • a release valve for controlling the release of fluid under pressure form a blood pressure measuirng apparatus
  • said release valve including a valve body communicating with said inflatable means for permitting fluid flow therebetween, valve means movable between open and closed positions with respect to said body for controlling the release of said fluid under pressure
  • said valve means including a control head movable to positions corresponding to said open and closed positions of said valve means, a guide element on said valve body cluding a chamber in said control head, said chamber having an opening and a first portion of a larger diameter than the outside periphery of said guide element to allow relative movement of said control head over said guide element, and a second portion narrowed to a smaller diameter than said outside periphery of said guide element to releasably couple said control head and said guide element against the action of said selfclosing means in a position corresponding to said open position of said valve means.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Vascular Medicine (AREA)
  • Cardiology (AREA)
  • Medical Informatics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Physiology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Safety Valves (AREA)
  • Check Valves (AREA)
  • Compressor (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Reciprocating Pumps (AREA)
US28914972 1972-09-14 1972-09-14 Retaining means for sphygmomanometer valve control head Expired - Lifetime US3823707A (en)

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US28914972 US3823707A (en) 1972-09-14 1972-09-14 Retaining means for sphygmomanometer valve control head
DE19732345716 DE2345716A1 (de) 1972-09-14 1973-09-11 Steuereinrichtung fuer ventile
JP10225773A JPS4968924A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-09-14 1973-09-12

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JP (1) JPS4968924A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2345716A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954099A (en) * 1974-02-08 1976-05-04 Propper Manufacturing Company, Inc. Sphygmomanometer
US4037587A (en) * 1976-03-11 1977-07-26 Bristoline Inc. Valve assembly for a sphygmomanometer
US4098291A (en) * 1976-10-12 1978-07-04 Manoscope, Inc. Pressure relief valve
US4200259A (en) * 1977-06-27 1980-04-29 Ueda Works Co., Ltd. Pressure relief valve for blood pressure measuring instrument
US4413631A (en) * 1981-12-24 1983-11-08 Lacks Harold G Sphygmomanometer construction
US4416287A (en) * 1981-09-28 1983-11-22 Rudolf Riester Gmbh & Co., Kg Discharge valve for a blood pressure measuring device or the like
US4418699A (en) * 1979-08-07 1983-12-06 Chen Hsu C Twin gauge and twin needle sphygmomanometers
EP0134319A1 (en) * 1983-08-04 1985-03-20 Harold G. Lacks Sphygmomanometer construction
US4552153A (en) * 1983-11-17 1985-11-12 Welch Allyn Inc. Pressure gauge
US4690171A (en) * 1986-06-05 1987-09-01 Johnston Charles F Valve assembly for a sphygmomanometer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934061A (en) * 1957-06-03 1960-04-26 Propper Mfg Company Inc Sphygmomanometers
US3043556A (en) * 1960-04-08 1962-07-10 Woodford Mfg Company Means for adjustably regulating the flow of yard hydrants
US3119449A (en) * 1961-03-31 1964-01-28 Price Frederick Purging choke
US3254671A (en) * 1964-08-24 1966-06-07 Emanuel R Berliner Push control valve for instant deflation of blood pressure instruments
US3361148A (en) * 1964-11-23 1968-01-02 W D Allen Mfg Co Regulator valve
US3504663A (en) * 1965-10-21 1970-04-07 Smithkline Corp Air flow control
US3738357A (en) * 1971-10-26 1973-06-12 R Hayes Control apparatus for blood pressure testing device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934061A (en) * 1957-06-03 1960-04-26 Propper Mfg Company Inc Sphygmomanometers
US3043556A (en) * 1960-04-08 1962-07-10 Woodford Mfg Company Means for adjustably regulating the flow of yard hydrants
US3119449A (en) * 1961-03-31 1964-01-28 Price Frederick Purging choke
US3254671A (en) * 1964-08-24 1966-06-07 Emanuel R Berliner Push control valve for instant deflation of blood pressure instruments
US3361148A (en) * 1964-11-23 1968-01-02 W D Allen Mfg Co Regulator valve
US3504663A (en) * 1965-10-21 1970-04-07 Smithkline Corp Air flow control
US3738357A (en) * 1971-10-26 1973-06-12 R Hayes Control apparatus for blood pressure testing device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954099A (en) * 1974-02-08 1976-05-04 Propper Manufacturing Company, Inc. Sphygmomanometer
US4037587A (en) * 1976-03-11 1977-07-26 Bristoline Inc. Valve assembly for a sphygmomanometer
US4098291A (en) * 1976-10-12 1978-07-04 Manoscope, Inc. Pressure relief valve
US4200259A (en) * 1977-06-27 1980-04-29 Ueda Works Co., Ltd. Pressure relief valve for blood pressure measuring instrument
US4418699A (en) * 1979-08-07 1983-12-06 Chen Hsu C Twin gauge and twin needle sphygmomanometers
US4416287A (en) * 1981-09-28 1983-11-22 Rudolf Riester Gmbh & Co., Kg Discharge valve for a blood pressure measuring device or the like
US4413631A (en) * 1981-12-24 1983-11-08 Lacks Harold G Sphygmomanometer construction
EP0134319A1 (en) * 1983-08-04 1985-03-20 Harold G. Lacks Sphygmomanometer construction
US4552153A (en) * 1983-11-17 1985-11-12 Welch Allyn Inc. Pressure gauge
US4690171A (en) * 1986-06-05 1987-09-01 Johnston Charles F Valve assembly for a sphygmomanometer

Also Published As

Publication number Publication date
DE2345716A1 (de) 1974-03-28
JPS4968924A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-07-04

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