US2572389A - Magnifier for pulse beat indicators - Google Patents

Description

Oct. 23,1951 w. c. RICE MAGNIFIER FOR PULSE BEAT INDICATORS 2 SHEETS-SHEET l u ln umnnu HH IIIIII4 I Filed June 11, 1948 //\//E/\/ TUR WENDELL C. REE

Oct. 23, 1951 w. c. RICE 'MAGNIFIER FOR PULSE BEAT INDICATORS 2 SHEETSSHEET 2 Filed June 11, 1948 //\/Z/E/\/ TUF? WENDELL c. mar:

Patented Oct. 23, 1951 UNITED STATES PATENT OFFICE 2,572,389 MAGNIFIER FOR/PULSE BEAT INDICATORS Wendell C. Rice, Coulee Dam, Wash. Application June 11, 1948, Serial No. 32,349

3 Claims. (Cl. 1282.05)

This invention relates generally to medical instruments and particularly to a pulsimeter and indicator for blood pressure.

The main object of this invention is to provide a simple form of pulsimeterand indicator for blood pressure which can be produced at a negligible cost and which, while not perfectly accurate, will give a very fair approximation of the blood pressure.

The second object is to produce, a device of the class described which can be operated by an inexperienced person.

A further object is to so construct the device that it will be no larger than a fountainpen and may be so carried.

I accomplish these and other objects in the manner'set forthin the following specification as illustrated in the accompanying drawings, in which:

Fig. 1 is a partial section showing the parts in position for carrying in the pocket.

Fig. 2 is a view showing the parts in position fOr use with .the cover in section.

Fig. 3 is an elevation showing the indicator in an extended position.

Fig. 4 is an enlarged section through the actuating portion of the device.

Fig. 5 is a perspective view of the indicating element.

Fig. 6 is a side elevation of a modified form of the device in a position of rest.

Fig. 7 is a section showing the parts in an operating position.

Fig. 8 is a section taken along the line 8-8 in Fig. 7.

Fig. 9 is a section taken along the line 99 in Fig. 7.

Like numbers of reference refer to the same or similar parts throughout the several views.

Referring in detail to the drawings, there is shown an actuating tip I having a cupped end II and a tubular end I2 having the converging end I3 which forms a seat for the point I4 on the stem I nearwhose lower end is formed a flange I6.

The member I2 is preferably made of plastic material and is crimped at the two points I! above the flange I6 in order to hold the tube I2 loosely on the stern I5. The tube I2 is capable of a limited rocking movement with relation to the stem I5 when the cupped end rests upon the portion of the body I8 where pulse action is observable.

The end I9 of the stem I5 is passed slidably through the guide 26 from whose shoulder 2| extends the tube 22 which encloses a tension spring 2 23 whose end 24 pins the plunger 25.

The mechanism thus far described is the actuating portion of the device. I Q

The barrel 26 slidably receives the tube 22. Within the barrel 26 is slidably placedthe indicating element shown in Fig. 5. v This consists of a tube 21 having slots 28 formed across its end 29 to insure a certain amount of friction being present between the parts 26 and'2'I.

The tube 21 has a closed end 30 preferably provided Witha flange 3| which prevents the end 36 from slipping into thebar'rel 26.

The tube 21 is provided with calibrations '32 which may be arbitrary values or represent the approximate pressure inlthe blood stream.

The operation of the device is as follow:

--The end II is placed against theibody. I8 ;at a point of pulsation, care being taken to hold the stemco-axial with the end I2. Owing to the position of the pivot point I4 with relation to the boundaries of the tip I II the pulsations will cause a rocking motion of the tube I2.

The barrel 26 is held in the hand and pressure gradually applied along the axis of the stem I5 until the pressure at the tip I0 is sufficient to stop the flow of blood and consequently the rocking of the tube I2.

This pressure on the barrel 26 elongates the spring 23 and as the plunger 25 engages the end 29 of the tube 21 it causes the graduated portion of the tube 21 to emerge from the barrel 26 and the last calibration 32 to emerge from the barrel 26 indicates approximately the pressure of the blood.

In Figs. 6 to 9, the same result is accomplished with a somewhat different mechanism. There is shown a tubular tip 33 whose rounded end 34 is used to engage the body surface 35.

The open end 36 of the tip 33 is provided with an internal thread 31. The closed end 34 has a conical recess 38 formed in its inner side. Ex-

stem end I9 to the tending into the tip 33is a stem 39 Whose flattened portion 40 is provided with a large opening 4 I, through which freely extends the pin 42 which is mounted transversely in the tip 33.

The purpose of this construction is to permit a free rocking movement of the tip 33 in any direction without permitting the point 43 of the stem 39 to escape from'the recess 38.

The stem 39 has a reduced portion 44 from which it is separated by the shoulder 45. The stem portion 44 is slidable in the guide 46 which forms the end of a barrel 41.

The guide 46 is externally threaded and proband 51, through the manipulation of which the initial pressure on the spring 5| may be varied to meet the various requirementszfor' age? or other factors.

The reduced stem portion 44 extends through 4 said stem and spaced therefrom whereby the pulse action will cause a magnified rocking motion of said extension with relation to said stem. 2. A magnifier for visibly indicating pulse beats comprising a tip adapted to be placed against the skin at the point of pulsation, a tubular extension for said tip, a stem within said extension, pivotally mounted on said tip, whereby a. pulse. action exertedtagainsasaid tip will produce a lateral rocking motion ofi said, tubular extension with relation to said stem and means 1 for applying pressure axially along said stem.

the plunger 55 and slides in; the. guiding; wall- 1 58. On the end of the stem portion 44 issecured an indicator head 59 which is confinedwithin the cavity 60 which is closed by the cap 6|.

The barrel 41 is preferably' of transparent material so that the position of the indicator- 59 may beseen within the cavity 60;

The operation of this form of the device is similar to that"described for Figs. i to- 5 except that-in thi's casethe indication of-pul'se action is only momentary while the device is in. place during-which time the observation must be made, while in'the first: described form of the device the indication remains visibl eiuntil manually moved. Obviously; the members 10 and I 5' may be used ad'onetmmagniftvvisiblsc the pulse action incase the count alone is: desired.

I'claim':

1. Al magnifier for pulse:v beat indicators com- 3. A magnifier for visibly indicating pulse beats comprisingthe device described in claim 1, to-

gether with a spring loaded pressure applicator including a calibrated scale whereby the pressure applied: bw saiidz applicator is visibly indicated on said, scale, and the frequency of the pulsations is indicated by the rocking motion of said extension.

WENDEEE C. RIGE.

REFERENGES CITED The following, references are of record in. the fil'e of this patent:

UNITED STATES PATENTS Germany July 23, 1909

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