JPS61296230A - Fluid pressure measuring instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION The present invention relates to fluid pressure measuring instruments, and more particularly to a novel structure for a blood pressure measuring instrument or sphygmomanometer that allows for efficient and highly accurate measurements.

A considerable number of blood pressure measuring instruments have been developed over the years, and some very suitable designs have been proposed. However, one problem that even the best designs are not immune to is the problem of achieving and maintaining accurate calibration, including zeroing for the indicator. If measurements are found to be inaccurate during periodic inspection,
The meter would have to be returned to the factory for recalibration, an obvious inconvenience. Other problems associated with conventional meters include obtaining good release valve performance and the ability to achieve complete fluid tightness within the meter.

The prior art related to the pressure measuring device targeted by the present invention is as follows:
Disclosed in U.S. Patent Nos. 3,738,357, 4823,707, 4,013,265, and 4,243,201. However, these patents are primarily directed to the performance of the release valve, one piston ridge as taught by the present invention, for moving the indicator needle in response to fluid pressure within the cuff of the blood pressure monitor. does not disclose a nine-diamond slam assembly. In addition, each of the above-mentioned U.S. patents discloses that the calibration of the present invention can be carried out by an external operation so that a doctor can maintain accurate calibration of the blood pressure measuring device without having to return the blood pressure measuring device to the factory. No adjustment means disclosed.

SUMMARY OF THE INVENTION The blood pressure measuring device of the present invention, for use in conjunction with a conventional blood pressure cuff, includes a housing and a ninth member connected to the housing for supplying pressurized fluid to the cuff. It consists of a rubber pulp and a gauge attached to the housing and having a conventional dial and pointer for indicating the pressure of the fluid in the cuff. A piston and ridge assembly is provided within the housing in which the piston is moved by pressurized fluid. The piston is adapted to displace, by its movement, the free end of a leaf spring connected to the pointer so that the pointer can be rotated relative to its dial.

The leaf spring is adapted to be engaged by adjustable fulcrum means, the fulcrum means being movable on the 111 ttl line to effect adjustment for zeroing the pointer, It can be moved on a second axis to control the rate. By controlling the spring rate, the gauge can be accurately calibrated. The adjustment means for adjusting the fulcrum are accessible from the outside of the housing, so that the physician or technician can make the necessary adjustments.
It can be done arbitrarily.

The blood pressure measuring device also includes a release valve for releasing pressure fluid from the cuff and the housing, and a trigger element for actuating the release valve. The vent valve is equipped with dual O-ring seals to minimize the possibility of fluid leakage when the vent valve is closed. The trigger element is
It is connected to a cam via a cam follower, and the cam has a shape that provides a push-in locking operation and a push-in release operation to the trigger element. The locked position of the trigger element is used when rapid fluid release is required.

To explain with reference to the drawings, the blood pressure measuring device of the present invention basically consists of a housing 1o, a rubber gripping pulp (spherical body) 11, and a pressure gauge dial (scale plate) 12. ing. The housing interior 0 consists of left and right mating halves, preferably made of molded plastic. These two halves are fitted with a retaining ring 14 (FIG. 3);
It is connected by a threaded car)-15 and a gauge fitting ring 16.

The lower wall 17 (FIG. 3) of the housing 1q has a collar adapter 1 having seven upper flange 20 and seven lower flange 21.
8 is installed. Adapter 1 day, up and down 7 lunges 2
The part between 0 and 21 is fitted into an opening 22 formed in the lower wall 17 of the housing. With this configuration, the adapter 18 is non-rotatably coupled to the housing;
The collar 15 is screwed onto the lower 7 langes 21 of the adapter 18.

The rubber grip pulp 11 has a conventional reversal valve 24 (FIG. 3) on its bottom wall, and a collar adapter 1 at its upper end.
A cylindrical pulp connector 2 screwed into the threaded tag 26 of 8
It is fixed to the bolt ring 10 via the bolt 5. For this purpose, the valve connector 25 has an annular 7 flange 27
A perforated top wall of pulp 11 is sandwiched between this 7-lunge and force 2-15 to establish a fluid-tight seal. To further ensure this seal,
A plurality of annular protrusions 28 are formed on the lower surface of the crab 7-15 so as to bite into the upper surface of the top wall of the pulp 11.

As shown in Figures 2 and 3, the top of the blood pressure meter is provided with a connecting tube 29 adapted to be connected in a fluid-tight manner to a conventional inflatable blood pressure cuff (not shown). It is being Rubber pulp 11 to inflate the cuff
t - When squeezed in the normal manner, air flows through the cylindrical connector 2.
5 and rubber boot 30 and into a back valve assembly 51 (FIGS. 3 and 4), described below. The reverse valve assembly 31 is disposed within a lower portion of a valve block 52 suitably supported within the housing 10. Air leaving the check valve ascends within the passageway 34 in the valve body 32 and enters the connecting tube 29 and from there into the cuff.

The lower end of the rubber boot 50 (FIG. 3) surrounds the upper flange 20 of the collar adapter 18, and the upper end of the rubber boot 50 (Fig. It surrounds the protrusion 35. Boot 50 thus establishes a fluid tight connection between valve connector 25 and check valve assembly 51. The check valve assembly 31 includes a pair of 180
° A flexible silicone tube 36 with opposing longitudinal slits 37 and a ball (valve body) 5 that seals one end of the corrugated tube.
8 and was fitted to the other end of the tube. and a perforated plug 40 having a longitudinal passage. The outer end of the passage 41 is covered by a filter 42. Plug 40 is threaded into protrusion 55 of valve block 62 as shown in FIG.

When the pulp 11 is actuated to inflate the blood pressure cuff, fluid pressure also acts on the piston 44 (FIG. 3), which acts to rotate the gauge needle or pointer 45 via a mechanism to be described below. do. O! The body (i.e. air) is
It flows into a chamber 46 which communicates with fluid passageway 34 in valve block 32. The chamber 46 includes the valve body 32, the piston 44,
It is defined by a ridge diameter 47 extending between the valve block and the piston. Piston 44
has a central hub 48 adapted to receive a cylindrical bottle 51 projecting from the valve block 32 in a hole 50 in one side of the hub. Bottle 51 is a sliding fit within bore 50 and together they serve to linearly guide the movement of piston 44 under the action of pressure fluid. The central portion of the ridge ram 47 covers the piston 44 and has a central hole for passing the piston hub 48. The diaphragm 47 is maintained in contact with the piston 44 by a cuff-shaped retaining member 52 (FIGS. 3 and 5.6). The holding member 52 compresses the diaphragm 47 against the circumferential lip 54 of the piston 440, coupling the diaphragm and the piston in a fluid-tight relationship.

The diaphragm 47 has a relatively large peripheral bead 55 (FIG. 3);
and the spring retaining block 56 in a fluid-tight manner. The spring retaining block 56 houses a rounded mechanism that converts the linear movement of the piston 44 into angular or rotational movement of the full pointer 45.

A sector-shaped leaf spring 57 (Fig. 3.5) is fixed at its wide end 58 to the spring retaining block 56 and at its free end (
fill! The pincer end) projects into the block 56 opposite the central hub 48 of the piston 44 . Attached to the free end of the leaf spring 57 is a pointed element 60 which is engaged by the piston hub 48 via a ball bearing 61. The bearing 61 is held in a correspondingly shaped recess formed in the knob 48 and the tip element 60 (third
figure). The plate spring 57 is a gauge (displayed -) of the piston 44.
a), i.e. to the right as viewed in FIG. 3, the movement of the piston 44 causes the leaf spring 57 to
The free end of is moved in an arc towards the gauge. This conversion of the linear motion of the piston into the arcuate motion of the leaf spring is smoothly performed by the ball bearing 61.

As the leaf spring 57 moves to the right, the tip element 60 pivots around the pivot point 64 of the lever 627a. The pivoting movement of the lever 62 is converted into a rotational movement of a pinion 66 connected to the pointer 45 via a well-known conversion mechanism 65t.

According to the invention, adjustment means are provided for adjusting the zero position of the pointer 45 and the spring rate of the leaf spring 57. Since the adjustment means can be operated from outside the housing 10, the physician can make adjustments without having to return the blood pressure meter to the factory. This node means is shown as regulator #I67 in FIGS. 3 and 8. The adjustment mechanism 67 may be installed in an opening provided in the side wall of the spring retaining block 56 or incorporated into a four-section block.
A fulcrum bar 70 (
3.8.9).

The fulcrum bar 70 has a transverse central threaded hole 72 into which a spring rate adjustment screw 74 is threaded.

Adjustment screw 74 has a rounded nose 75 (FIG. 8) that slides into a slot 76 formed in adjustment block 68. Adjustment screw 74 also connects adjustment block 56
It has an unthreaded cylindrical portion 77 that slides into a slot 78 formed in the cylindrical portion. At the inner end of the cylindrical portion 77,
Seven integral flanges 80 are formed that abut washers 81. According to this configuration, the adjustment screw 74 is prevented from moving in the longitudinal direction, so that by turning the screw 74, the fulcrum bar 70 is moved in the direction shown by the arrow 82 in FIG. is moved in a direction substantially parallel to. The cylindrical portion 77 of the screw 74 extends outwardly through a small opening 84' provided in the housing 10 and has a hexagonal receptacle on its outer end surface for receiving the tip/te. Mouth 8
5. Therefore, it is possible to engage the socket 85 with a wrench from the outside of the housing 10 and turn the adjusting screw 74 (FIG. 1.5.8).

The fulcrum bar 70 also has a zero adjustment screw 87 (third percent
8), it is also possible to move it in the direction indicated by the arrow 86 in FIG. The screw 87 has a conical inner end 90 that engages a floating adjustment plate 91 that engages a flat inner side 92 of the fulcrum bar 70.

With this configuration, when the screw 87 is turned and threaded into the adjustment block 68, the conical end 90 of the screw acts as a wedge surface, allowing the adjustment plate 91 and the fulcrum bar 70 to be threaded into the third.
8, move it to the left to completely move the adjustment screw 74 together with the fulcrum bar 70. The zero adjustment screw 87 has at its outer end a hexagonal socket 94 into which a wrench can be inserted through the opening 95fjr of the housing 10.

According to the above-mentioned adjustment mechanism 67, if it is visually confirmed that the pointer 45 does not accurately match the zero scale when the pressure inside the blood pressure measuring device does not exceed atmospheric pressure, the zero adjustment screw 87 is turned off. The zero position of the pointer can be corrected by turning it back and forth. That is, the forward and backward movement of the screw 87 changes the angular position of the leaf spring 57, thereby adjusting the position of the pointer 45 via the lever 62, the conversion mechanism 65, and the pinion 66.

To determine whether this blood pressure meter is accurately calibrated, i.e., whether the reading on dial 12 accurately represents the fluid pressure within the cuff during use of the meter, the meter is placed on a mercury manometer. Must be compared and inspected periodically. If the meter reading is inaccurate, it can be corrected by turning the spring rate adjustment screw 74 forward or backward. The adjustment screw 74 can be moved forward or backward by moving the fulcrum bar 70 along the leaf spring 57 in a direction parallel to the plane of the wave leaf spring without changing the angular position of the leaf spring 570. Regulate gender. In other words.

The position of the fulcrum of the leaf spring 57 is such that the free end of the corrugated leaf spring controls the resistance that corresponds to the movement of the piston 44, and the resistance is the rotation angle (ratio) 1 of the pointer 45 to a constant amount of movement of the piston 44. decided on.

After inflating the blood pressure cuff, pressurized fluid is released from the cuff and blood pressure meter to the outside by opening the normally closed valve 96 (Figure 3.10). The opening and closing of the discharge valve 96 is controlled by a trigger 97 pivotally connected to the housing 1o at a pivot point 98. trigger 9
A rounded protrusion 100 that engages with a head 101 of a discharge pin 102 (valve body) of the discharge valve 96 is formed near the lower end of the discharge valve 96 .

A discharge bottle 102 is mounted within a hole 104 in a tubular projection 105 of the valve block 52, the inner end of the bottle being a play fit in a circular orifice 106 connecting the hole 104 to the above-described fluid passageway 64 in the valve block. and protrudes into the passage 34. When the discharge valve 96 is closed as shown in FIG. 3.10, the O.
Ring 107 engages the wall of passageway 34 and connects passageway 54 and hole 1
A fluid-tight seal is set between the 04 and 04. Furthermore, hole 1
The second O-ring 108 attached to the inner end of 04 is
A fluid-tight seal is established on the discharge bin 1020 surface, thus forming a secondary seal. 0 ring 107 is washer 1
10 and a retaining ring 111 (FIG. 10), and is held on the ejection pin 102 by a compression spring 112 so as to tightly contact the wall of the passageway 54. Compression splash 112
surrounds the ejection pin 102, and the head 101 of the bottle;
It is held between a washer 114 that abuts against the O-ring 108.

When the trigger 97 is pushed inward, the υ release pin 102 is pushed inward by the protrusion 100 of the trigger, and the O ring 107 is pushed inward.
is pulled away from the wall (seat) of the passageway 34, and the tapered portion 115 of the bottle 102 enters the orifice 1u6 through the O-ring 108-i.

This allows pressurized fluid within the cuff and housing 10 to be discharged from the passageway 34 through the orifice 106 and the hole 1041 to the atmosphere at a controllable, variable rate by means of the pointer 45 on the dial 12 of the gauge. Be able to read the displayed reading. The relative axial position of the tapered portion 115 with respect to the O-ring 108 determines the size of the discharge or relief passage (the gap between the tapered portion 115 and the wall of the orifice 106) (area) t.
-1 Therefore, the release rate is totally determined. As seen in FIG. 10.14, a plurality of longitudinal relief marks 116 are formed on the wall of the hole 104, so that the fluid flowing into the hole 104 from the orifice 106 can escape to the atmosphere. is being done.

Once the reading is read, it is desirable to quickly release any residual fluid in the cuff and housing 10 (full release), which can be accomplished by pushing the trigger 97 further inward. That is, as the trigger 97 is pushed further inward, the reduced diameter portion 117 of the ejection pin 102 advances into the orifice 106, allowing fluid to escape quickly. However, it is desirable for the operator of the blood pressure meter not to be required to hold the trigger 97 depressed, even when fluid is rapidly or "full open".

According to the invention, therefore, means f are provided for locking the trigger metal in its inward quick release or "full open" position.

The mechanism for locking trigger 97 in its quick-release position includes a cam 118 and a cam follower 120 that couples trigger 97 to a cam groove or track of cam 118, as shown in FIGS. 11-13. Become. Cam follower 120 is activated by trigger 97 by retainer plate spring 122 (FIG. 11).
and is held in engagement with the cam track 121. When the discharge valve 96 is closed and the trigger 97 is in the normal position, the inwardly bent inner end 124 of the cam follower 120 is located at a starting point 125 within the cam track 121.

The cam track 121 allows the trigger 97 to have a push-in locking action and a push-in release action, and the leaf spring 122
is designed to maintain the orientation of cam follower 120 until it is acted upon by the below-described slopes of cam track 121. That is, when the trigger 97 is fully depressed, the end 124 of the cam follower 120 abuts the ramp 123 (FIG. 12) of the cam track, directing the cam toward the upper horizontal section 126 of the track, and then the ramp 127.
and is pushed down into the stop position 129. here,
When the trigger 97 is released, the end 124 of the cam follower descends along the slope 128 of the cam track and seats in the notch 15o at the bottom of the slope 128. When the cam follower reaches this position, trigger 97 is locked in its quick release position.

The compression spring 112 biases the trigger outwardly and thus serves to hold the trigger in the locked position until it is pressed again and released.

When the trigger is pushed inward to release it from its locked position, the end 124 of the cam follower engages the ramp 131 of the cam track and is pushed down to reach the stop position 133. When the trigger is now released, the end 124 of the cam follower is returned to the starting position [125] following the section 132 of the cam trajectory under the action of the compression spring 112.

The trigger mechanism described above has advantages over conventional release valve actuation mechanisms in that it is easy to operate, allows for more precise adjustment of the variable release rate of granules, and is easier to release. It's excellent.

Referring again to FIG. 3, the piston 44 and ridge diaphragm 72 ram 47 will be described. It has several advantages over manufactured bellows. First, since the undulating diaphragm 47 can lengthen the stroke of the piston 44, the high motion conversion magnification conventionally required for the conversion mechanism 65 can be reduced. In addition, according to this piston/ridge υ diamond Fuji 4 assembly, unlike the case where a metal Perot is used, the components are strictly aligned in the ninth stage of changing the output of each component, and the moving parts f ,
No need to adjust. Further, the leaf spring 57 maintains high accuracy for a long period of time despite fatigue.

Figures 15 and 16 show a variant mechanism for connecting the free end of the leaf 57 to the gauge pointer 45. This mechanism is time consuming as required by the conventional lever set motion conversion mechanism 65.

and eliminates three-dimensional adjustment, which is often inaccurate. That is, this deformation mechanism does not require preliminary adjustment and is provided with a rack 135 and a pinion 136. One end of the rack 135 is suspended by a point member 60 attached to the free end of the leaf spring 57, and when the leaf spring 57 is displaced by fluid pressure, the rack 155 is guided within the housing 10. It is moved longitudinally, thereby rotating pinion 136.

The pinion 156 is rotatably supported within the housing 11, fixed to the pinion and the first bevel gear 138, and connected to the first bevel gear 158 via a second short shaft 137t. The bevel gear 138 meshes with a second bevel gear 140 connected to the pointer 45 via a shaft 141. The shaft 141 is also rotatably supported within the housing 10.

Although the present invention has been described above with reference to nine cases in which the present invention is applied to a blood pressure measuring device, it is clear to those skilled in the art that the present invention can also be applied to other pressure measuring devices such as a depth gauge for scuba diving. Will.

[Brief explanation of drawings]

The first number is a front view of the blood pressure measuring device according to the present invention, FIG. 2 is a side view of the measuring device of FIG. 1, FIG. Figure 4 is an enlarged sectional view of the reverse valve assembly, Figure 3 is a plan view of the diaphragm retaining member, Figure 6 is a sectional view taken along line 6--6 in Figure 3, and Figure 7 is a view of the leaf spring. 8 is an enlarged sectional view of the adjustment mechanism, FIG. 9 is an enlarged perspective view of the fulcrum bar, FIG. 10 is an elevational sectional view of the valve block, FIG. 11 is a side view of the valve block, and FIG. 15 is an enlarged plan view of the cam follower; FIG. 14 is an enlarged cross-sectional view of the discharge valve taken along line 14--14 of FIG. 10; FIG. FIG. 15 is an elevational view of the deformable mechanism for connection to the leaf pointer, and FIG. 16 is a side view taken along line 16--16 of FIG. 15. In the figure, 10 is a housing, 11 is a rubber pulp, 12 is a dial, 25 is a valve connector, 29 is a connecting pipe, 52
is a valve block, 44 is a piston, 45 is a pointer, 47 is a diaphragm, 57 is a leaf spring, 60 is a tip element, 61 is a ball bearing, 62 is a lever, 70 is a fulcrum bar, 74
is a spring rate adjustment screw, 87 is a zero adjustment screw, 96 is a release valve, 97 is a trigger, 107.10B is an O-ring, 118
is the cam, 120 is the cam follower%, 121 is the cam trajectory, 13
5 is rank, 136 is binion%, 138.140 is bevel gear. Original person for patent: Querch Allin, Inc. Engraving of drawings (no changes in content) FIG, 4 nG5F/G, 6 FIG, /4 Procedural amendment (voluntary) July 30, 1985 Commissioner of the Patent Office Michi Uga Department Tono ■Ayu 1
, Indication of the case Japanese Patent Application No. 138844/1984 2 Name of the invention Fluid Pressure Measuring Instrument Marunouchi Building 752 Ward 5 Specification subject to amendment 1 Inscription of claims and drawings (no change in content) 6. Amendment Contents of amendment The description of the claims of this application is amended as follows. ``2 Claims 1) A housing; a fluid introduction means connected to the housing for introducing fluid into the housing;
a gauge attached to the housing and having a dial and a pointer for displaying the pressure of the fluid; and a rotating means for rotating the pointer with respect to the dial in response to the pressure of the fluid in the housing. The rotating means has a piston disposed within the housing to be linearly moved by the fluid pressure, a free end and a fixed end fixed to the housing, the free end being a leaf spring engaged by the piston and adapted to be moved in an arc by linear movement of the piston;
a connecting means provided in the housing for connecting the free end of the corrugated leaf spring and the pointer so as to rotate the pointer by an arcuate movement of the free end of the leaf spring; and a spring rate of the covered spring. and a movable fulcrum means that engages the covered spring at a portion close to the fixed end to control the zero position of the pointer with respect to the dial. . 2) The fluid pressure measuring instrument according to claim 1, wherein the connecting means is a gear train. 3) A blood pressure measuring device for use in combination with an inflatable blood pressure cuff, comprising a housing, the cuff being connected to the housing and having a pressurized fluid introduced into the cuff;
a fluid introduction means for introducing fluid into the housing; a gauge attached to the housing and having a dial and a pointer for displaying the pressure of the fluid in the cuff;
rotation means for rotating the pointer relative to the dial in response to the pressure of fluid within the cuff, the rotation means being adapted to be moved linearly into the housing by the fluid pressure; a piston disposed in the housing, a free end and a fixed end fixed to the housing, the free end being engaged by the piston and configured to be moved in an arc by linear movement of the piston; a leaf spring; a connecting means disposed within the housing for connecting the free end of the leaf spring and the pointer such that the pointer is rotated by the arcuate movement of the free end of the leaf spring; It is characterized by comprising a movable fulcrum means that engages the covered spring at a portion close to the fixed end in order to control the spring rate of the leaf spring and to control the zero position of the pointer with respect to the dial. blood pressure measuring device. 4) A movable trigger is mounted on the housing and operable to release pressurized fluid therein from the housing and cuff and cooperates with the trigger to cause the trigger to have a predetermined rate of fluid release. 4. A blood pressure measuring device according to claim 3, wherein cam means is provided within the housing for locking the blood pressure measuring device in place. 5) A fluid release valve actuated by the trigger is provided, the release valve having a double O-ring seal to prevent fluid leakage during its closure. blood pressure measuring device. 6) A blood pressure measuring device for use in combination with an inflatable blood pressure cuff, comprising a housing and a connecting member provided on the housing for fluid-tightly connecting the how and the zinc to the cuff. a rubber valve connected to the housing for supplying pressurized fluid to the cuff; and a gauge affixed to the housing and having a dial and pointer for indicating the pressure of the fluid within the cuff. rotation means for rotating the pointer relative to the dial in response to the pressure of fluid within the cuff, the rotation means being linearly moved into the housing by the fluid pressure; a flexible diaphragm connecting the piston to the housing, a free end and a fixed end secured to the housing, the free end being engaged by the piston; The housing includes an elongated leaf spring configured to be moved in an arc by the linear motion of the piston, and an elongated leaf spring configured to be moved in an arc by the linear motion of the piston. a movable fulcrum means that engages the leaf spring at a portion close to the fixed end; and a movable fulcrum means that engages the leaf spring at a portion close to the fixed end; Section 1iv4 means for moving substantially parallel; and second adjusting means for moving said fulcrum means substantially perpendicular to the cover spring to accurately adjust said pointer to zero scale on said dial. A blood pressure measuring device comprising: 7) The blood pressure measuring device according to claim 6, wherein both the first and second pi node means can be operated from outside the housing. 8) A movable trigger is provided in the housing, and a fluid release valve actuated by the trigger is provided, the release valve having a double O-ring seal to prevent fluid leakage when closed. The blood pressure measuring device according to claim 6, which has the following. 9) A patent claim, wherein a cam and a cam follower connected to the trigger are provided, and the shape of the cam is determined so that the trigger can perform a push-lock operation and a push-release operation. The blood pressure measuring device according to item 8. A blood pressure measuring device according to claim 6, wherein the blood pressure measuring device is adapted to be added. A blood pressure measuring device for use in conjunction with an inflatable blood pressure cuff, the device comprising: a housing; a connecting member disposed on the housing for fluid-tightly connecting the housing to the cuff; a rubber valve mounted on the housing for supplying pressurized fluid to the cuff; a gauge mounted on the housing having a dial and a pointer for indicating the pressure of the fluid within the cuff; a piston that is provided in the cuff and moves linearly in response to the pressure of the fluid in the cuff;
an undulating diaphragm interconnecting the cuff, allowing the piston to move over a relatively long stroke, and cooperating with the piston to form one side of a sealed chamber in communication with fluid within the cuff; and a conversion means disposed within the housing for converting linear motion of the piston into rotation of the pointer. ”

Claims (1)

[Claims] 1) a housing; a fluid introduction means connected to the housing for introducing fluid into the housing;
a gauge attached to the housing and having a dial and a pointer for displaying the pressure of the fluid; and a rotating means for rotating the pointer with respect to the dial in response to the pressure of the fluid in the housing. The rotating means has a piston disposed within the housing to be linearly moved by the fluid pressure, a free end and a fixed end fixed to the housing, a leaf spring whose end is engaged by the piston and is adapted to be moved in an arc by linear movement of the piston;
a coupling means disposed within the housing for coupling the free end of the leaf spring to the pointer such that the pointer is rotated by an arcuate movement of the free end of the leaf spring; and a spring rate of the leaf spring. and a movable fulcrum means that engages the leaf spring at a location close to the fixed end to control the zero position of the pointer with respect to the dial. . 2) The fluid pressure measuring instrument according to claim 1, wherein the connecting means is a gear train. 3) A blood pressure measuring device for use in combination with an inflatable blood pressure cuff, comprising a housing, the cuff being connected to the housing and having a pressurized fluid introduced into the cuff;
a fluid introduction means for introducing fluid into the housing; a gauge attached to the housing and having a dial and a pointer for displaying the pressure of the fluid in the cuff;
rotation means for rotating the pointer relative to the dial in response to fluid pressure within the cuff, the rotation means being linearly moved within the housing by the fluid pressure; a piston arranged as such, a free end and a fixed end fixed to the housing, the free end being engaged by the piston and being moved in an arc by the linear movement of the piston; a leaf spring configured as such, and a connecting means provided within the housing for connecting the free end of the leaf spring and the pointer so that the pointer rotates due to arcuate movement of the free end of the leaf spring. and,
It is characterized by comprising a movable fulcrum means that engages the leaf spring at a portion close to the fixed end in order to control the spring rate of the leaf spring and to control the zero position of the pointer with respect to the dial. blood pressure measuring device. 4) A movable trigger is mounted on the housing and operable to release pressurized fluid therein from the housing and cuff and cooperates with the trigger to cause the trigger to have a predetermined rate of fluid release. 4. A blood pressure measuring device according to claim 3, wherein cam means is provided within the housing for locking the blood pressure measuring device in place. 5) A fluid release valve actuated by the trigger is provided, the release valve having a double O-ring seal to prevent fluid leakage during its closure. Blood pressure measuring device as described in section. 6) A blood pressure measuring device for use in combination with an inflatable blood pressure cuff, comprising: a housing; and a connecting member provided on the housing for fluid-tightly connecting the housing to the cuff; coupled to the housing;
a rubber valve for supplying pressurized fluid to the cuff; a gauge affixed to the housing having a dial and pointer for displaying the pressure of the fluid within the cuff; and a gauge responsive to the pressure of the fluid within the cuff; rotating means for rotating the pointer relative to the dial, the rotating means comprising a piston disposed within the housing so as to be linearly moved by the fluid pressure; a flexible diaphragm connecting a piston to the housing; a flexible diaphragm having a free end and a fixed end secured to the housing; the free end being engaged by the piston; an elongated leaf spring adapted to be moved in an arc; a conversion means disposed within the housing for converting the arcuate movement of the free end of the leaf spring into rotation of the pointer; a movable fulcrum means that engages at a portion proximate to the fixed end; and a first adjusting means for moving the fulcrum means substantially parallel to the leaf spring in order to adjust the spring rate of the leaf spring. a second adjusting means for moving the fulcrum means in a direction substantially perpendicular to the leaf spring in order to accurately adjust the pointer to the zero scale on the dial. 7) The blood pressure measuring device according to claim 7, wherein both the first and second adjusting means can be operated from outside the housing. 8) The housing is provided with a movable trigger, and a fluid release valve actuated by the trigger is provided, the release valve having a double O to prevent fluid leakage when closed. The blood pressure measuring device according to claim 7, which has a ring seal. 9) A patent claim, wherein a cam and a cam follower connected to the trigger are provided, and the shape of the cam is determined so that the trigger can perform a push-lock operation and a push-release operation. The blood pressure measuring device according to item 8. 10) A blood pressure measuring device for use in combination with an inflatable blood pressure cuff, comprising: a housing; and a connecting member provided on the housing for fluid-tightly connecting the housing to the cuff; a rubber valve mounted on the housing for supplying pressurized fluid to the cuff; a gauge mounted on the housing having a dial and a pointer for indicating the pressure of the fluid in the cuff; a piston disposed within the cuff that moves linearly in response to the pressure of fluid within the cuff; and interconnecting the piston and the housing such that the piston moves over a relatively long stroke. an undulating diaphragm disposed within the housing and cooperating with the piston to form one side of a sealed chamber in communication with fluid within the cuff; A blood pressure measuring device comprising a conversion means for converting into rotation.