Apparatus for cystographic inspection

Abstract: An apparatus for cystographic inspection used for observing and measuring the urethrophraxis portion and posterourethovesical angle of a patient of the acraturesis caused by a ventral pressure is disclosed. The present apparatus comprises a catheter (12), a flexible urethral locus indicating member (14) and a marking member (16) The flexed condition of the urethra and the posterourethrovesical angle can be clearly confirmed by the urethral locus indicating member (14) and the position of an exterior urethral opening can be surely grasped by the marking member (16).

Description: The present invention relates to a medical inspection apparatus, and more particularly to an apparatus for cystographic inspection used for observing and measuring the urethrophraxis portion and posterourethrovesical angle of a patient of the acraturesis caused by a ventral pressure. In order to observe the flexed state of the urethra and the posterourethrovesical angle in such a patient of the acraturesis caused by a ventral pressure and the like, a cystographic inspection by which such urethral portions are roentgenographed is indispensable in the present medical art. In such conventional cystographic inspection, the flexed and abstructed states of the urethra have been examined by filling a contrast medium into a catheter, inserting the contrast medium filled catheter into the urethra of the patient so as to protrude a painted end of the catheter into the urinary bladder and taking a roentgenograph in such a situation. However, in such a conventional system, the catheter tends to bend at the curved and abstructed portion of the urethra and thus, the roentgenograph of this portion shows an unclear image. Further, the position of the external urethral opening can not clearly be indicated in the roentgenograph, and the mutual angle and positional relationships of such individual organs in a roentgenogram become obscure. Therefore, it is very difficult to achieve a precise cystographic inspection. It is therefore an object of the present invention to provide an apparatus for cystographic inspection which can achieve a precise cystographic examination. US-A-4111190 discloses an apparatus for cystographic inspection by which a flexed condition of the urethra and a posterourethrovesical angle can be examined, the apparatus comprising; a catheter which is insertable from the urethra into the urinary bladder, and which can inject a contrast medium into the urinary bladder and which may be drawn out of the urethra after the injection of the contrast medium; and a urethral locus indicating member which is formed in the form of a flexible string, which can be roentgenographed and which is loaded in the catheter, may be emitted into the urinary bladder from the front portion of the catheter upon the injection of the contrast medium into the urinary bladder, and may be left in a region extending from the urethra into the urinary bladder after the catheter is drawn out of the urethra; and according to the present invention, such an apparatus is characterised by a marking member which can be roentgenographed, is movable on the urethral locus indicating member, has a diameter larger than that of the urethral locus indicating member, and may be disposed in the vicinity of the external urethral opening after the catheter is drawn out of the urethra. The marking member along with the urethral locus indicating member is disposed by the exterior urethral opening, so that the position of the exterior urethral opening can be clearly marked by the marking member, and consequently, the mutual angle and positional relationships of such individual organs in the roentgeogram can be clearly observed. In the accompanying drawings: Figure 1 is sectional view of a preferred embodiment of the apparatus used for cystographic inspection according to the invention; Figure 2 is an enlarged sectional view of one of the main components in the apparatus shown in Figure 1; and Figures 3A to 3D are explanative diagrams illustrating how to use the apparatus for cystographic inspection shown in Figure 1. Referring to appended drawings, a preferred embodiment of the present invention will be described in detail below. Figure 1 shows the entire construction of an apparatus used for cystographic examination. This apparatus 10 used for cystographic examination comprises a catheter 12 to be inserted into the urethra of a patient, a chain 14 loaded in the catheter 12, a marker 16 mounted on a portion of the chain 14, a string 18 connected to one end of the chain 14 and a rubber cap 20 to support the string 18. The catheter 12 is used for injecting a contrast medium into the urinary bladder. This catheter 12 is inserted into the urethra and the urinary bladder upon the injection of the contrast medium to be inserted into the bladder, and it is pulled out of the urethra upon roentgenographing after the injection of the contrast medium into the bladder. The catheter 12 comprises a Teflon (Registered Trade Mark) tube having a length of about 11cm and has a branched tube 21 formed in its intermediate portion. The catheter 12 has one end (on the right end of Figure 1) formed round in such a way that it can be smoothly inserted into the urethra, and has a thin film 22a stuck on the surface of the utmost end 22 thereof. On the other hand, other left end 24 of the catheter 12 is formed in such a way that a pointed end 26a of a cylinder 26 constituting an injector to inject a contrast medium into the urinary bladder can be fitted into the other left end 24 of the catheter 12. Into this cylinder 26 is slidably engaged a piston 28, as well known. The chain 14 is utilized to indicate the bending state of the urethra extending from an exterior urethral opening to the urinary bladder. The chain 14 is made of a nickel plated brass (an acid-proof metal), has length of about 30-40cm and is loaded in the catheter 12 prior to the cystographic examination. When a contrast medium is injected into the catheter 12, the chain 14 along with the contrast medium is emitted into the urinary bladder while breaking the thin film 22a stuck on the surface of the utmost end of the catheter 12. The chain 14 is left throughout the area exending from the urethra to the urinary bladder even after the catheter 12 was pulled out of the urethra. A marker 16 is utilized to indicate the position of the exterior urethral opening. The marker 16 is preset in the predetermined position of the chain 14 in such a way that the marker 16 is not penetrated into the urethra when the chain 14 is emitted into the urinary bladder. Figure 2 shows the inner structure of the marker 16. As shown in Figure 2, the cylindrical marker 16 has an opening 30 formed in the core thereof and the chain 14 is passed through the opening 30. The marker 16 can slidably be moved on the chain 14, and thus the marker 16 can be disposed or fixed in the desired position of the chain 14. The inner portion of the marker 16 is made of a gummous plastic material has a cylindrical shape with flanges on its opposite ends. A contrast medium is mixed into the gummous plastic material for roentgenography. Onto the periphery of the marker 16 is provided a metal ring 34 such as stainless steel and the like by suitable means such as welding with pressure or fitting process. The string 18 is utilized to draw the chain 14 out of the urethra 44 after completion of the roentgenography and in general, No. 1 thread of nylon is used as the string 18. The opposite end of the string 18 is pulled out from a rubber cap 20 through the brauched tube 21. The rubber cap is used to prevent the string 18 intruding into the urethra without resistance and holds the string 18 in situ by the elastic force of the rubber. Referring to Figures 3A to 3D, a preferred method to operate such an apparatus used for cystographic examination and its functions will be described hereinafter. First, a nozzle of a syringe cylinder 26 filled with a contrast medium is engaged into one end 24 of a catheter 12, and the catheter 12 having a chain loaded therein is inserted into the urinary bladder 42 from the exterior urethral opening 40, as shown in Figure 3A. Then, as shown in Figure 3B, a piston 28 of the syringe is pushed forward to inject a contrast medium 38 into the catheter 12 and thereupon the chain 14 loaded in the catheter 12 is moved forward to break a thin film 22a open and is emitted into the urinary bladder 42 at the same time as the injection of the contrast medium 38. After that, the contrast medium 38 is injected up to the maximum micturition. Then, the catheter 12 is pulled out of the urethra 44, the marker 16 is moved to the exterior urethral opening 40 with a pincette 46 as shown in Figure 3C and in the situation of holding the chain 14 at the exterior urethral opening 40 with the pincette 46, the catheter 12 is further moved back to pull the catheter 12 out of the urethra 44 leaving the string 18 intact. At this time, the inside diameter of the urethra contracts to the size of the outside diameter of the chain 14 from that of the outside diameter of the catheter 12. After the entire string 18 is pulled out of the catheter 12, only the chain 14 is left in the urethra 44 and the urinary bladder 42 as shown in Figure 3D. That is, the chain 14 remains over the entire range extending from the exterior urethral opening 40 to the urethra 44 of the urinary bladder 42. When roentgenographing is effected in this situation, images of the chain 14 and the urethra 44 extending from the exterior urethral opening 40 into the urinary bladder 42 can be observed and as the result, the flexed condition of the urethra and the posterourethrovesical angle can be clearly confirmed and measured. The position of the exterior urethral opening 40 can also be surely grasped by the image of the marker 16 disposed by the exterior urethral opening 40, and the mutual angle and positional relationships of such individual organs in the roentgenogram can be clearly observed, and hence a precise cystographic examination con be conducted. As described above, the flexed condition of the urethra extending from the exterior urethral opening to the urinory bladder 42 and the posterourethrovesical angle can be clearly confirmed by means of the urethral locus indicating member, and the position of the exterior urethral opening can be surely grasped by the marking member. Consequently, a precise cystographic examination can be achieved by the present invention.

Claims: An apparatus for cystographic inspection by which a flexed condition of the urethra (44) and a posterourethrovesical angle can be examined, the apparatus comprising a catheter (12) which is insertable from the urethra (44) into the urinary bladder (42), and which can inject a contrast medium (38) into the urinary bladder and which may be drawn out of the urethra after the injection of the contrast medium; and a urethral locus indicating member (14) which is formed in the form of a flexible string, which can be roentgenographed and which is loaded in the catheter (12), may be emitted into the urinary bladder (42) from the front portion of the catheter upon the injection of the contrast medium (38) into the urinary bladder, and may be left in a region extending from the urethra (44) into the urinary bladder after the catheter is drawn out of the urethra; characterised by a marking member (16) which can be roentgenographed, is movable on the urethral locus indicating member (14), has a diameter larger than that of the urethral locus indicating member, and may be disposed in the vicinity of the external urethral opening after the catheter is drawn out of the urethra. An apparatus according to claim 1, wherein the catheter (12) comprises a Teflon (Registered Trade Mark) tube. An apparatus according to claim 2, wherein the catheter (12) has a branched tube (21) formed in the intermediate portion of the catheter. An apparatus according to any one of the preceding claims, wherein the urethral locus indicating member consists of a chain (14). An apparatus according to claim 4, wherein the chain (14) is made of nickel plated brass and has a length of 30 to 40cm. An apparatus according to any one of the preceding claims, wherein the marking member (16) can slidably be moved on the urethral locus indicating member (14) and can be disposed or fixed in the desired position on the urethral locus indicating member. An apparatus according to any one of the preceding claims, wherein the marking member has a metal ring (34) fitted onto its periphery. An apparatus according to any one of the preceding claims, further including a second string member (18) utilised to draw the urethral locus indicating member out of the urethra (44) after completion of the roentgenoqraphy.

Inventors: KOZIMA TAKASHI C O HAKKO ELECT, MARUYAMA MASARU C O HAKKO ELEC, WATANABE HIDEKI SAN-MANSHON CH, KOZIMA, TAKASHI, C/O HAKKO ELECTRIC, MARUYAMA, MASARU, C/O HAKKO ELECTRIC, WATANABE, HIDEKI, SAN-MANSHON CHIKUSAKOEN A-406,
Applicants: HAKKO ELECTRIC MACHINE WORKS C, HAKKO ELECTRIC MACHINE WORKS CO. LTD.
Application year: 1990
Main classification: A61B6
IPC codes: A61M25, A61B6