JPS5957664A - Stay needle - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] ■ Background of the Invention (Technical Field) The present invention relates to a structure of a connecting portion of an indwelling needle that is configured so that a connector of another circuit can be connected to the indwelling needle with a simple operation. . Although indwelling needles are used by connecting to various circuits, in this specification, connection to a dialysis circuit will be typically used as an example for easy understanding. However, the present invention is not limited thereto.

(Prior Art R and Problems) Conventionally, when connecting a male connector of a dialysis circuit and a single-sided indwelling needle, the indwelling needle was inserted into the shunt, and then the inner needle and the inner needle bald were removed from the catheter bald, and the catheter, Temporarily stop the blood flowing into the catheter hub by pushing up the puncture site with your finger, and then connect the dialysis circuit to the patient's shunt by connecting the male connector on the circuit side to the catheter head. A method has been adopted to do so. In this way, connecting the dialysis circuit to the patient requires a three-step procedure: removing the inner needle, temporarily stopping the bleeding, and connecting the connector, and the operator must stay with the shunt at all times during the procedure. Operation efficiency is poor.

In order to solve the inconvenience of such a procedure, various methods have been developed, for example, some have equipped the blood flow channel with a manual cock for opening and closing the flow channel, and a setan, but no satisfactory results have been obtained. . In addition, in the indwelling catheter disclosed in Japanese Utility Model Application No. 55-11'9739, a tube having a gono-ring seal member is attached to the catheter hub, and when the inner needle is inserted into the seal member, the seal member covers the inner needle. It is elastically covered and seals the blood that flows in from the catheter side, and even after the inner needle is removed, the blood sealing property is maintained due to the elasticity of the membrane.
When connecting the connector on the circuit side to the catheter hub, push the connector into the sealing member, rupture the sealing member, and bring the connector and catheter tube (tube) into close contact while communicating the flow path of the shunt and the dialysis circuit jj8. It is of the form. However, even with this type, when the connector is pushed into the sealing member to make a connection, the sealing member ruptures almost radially at the inner needle puncture site, so the tight contact between the connector and the sealing member is becomes insufficient at the radial rupture,
There was a problem in that liquid tightness could not be maintained and blood could leak out.

11. Purpose of the Invention The present invention is capable of simply performing a series of operations such as puncturing an indwelling needle into a patient's shunt, removing the inner needle from the catheter shaft, and connecting the catheter shaft and the connector on the circuit side. Moreover, it is an object of the present invention to provide an indwelling needle configured to prevent blood from leaking from the concubine part during the operation process and during concubinage.

111 Specific Structure of the Invention According to the present invention, the tab catheter has a catheter bald part, the catheter hub has an inner needle tip that can be operated by the user, and the inner needle inserted into the catheter and the catheter hub include The catheter hub has an inner needle piercing portion that is provided on the catheter hub so as to seal a liquid passage, and that allows the inner needle to penetrate in a liquid-tight manner while the liquid passage of the catheter hub is sealed. The catheter has a predetermined break that is partially ruptured upon insertion of the catheter hub into the connector connected to the fluid delivery tube with a needleless tip.
- An indwelling needle is provided that includes a sealing member that seals between the plug and the connector. In order to prevent the sealing member and the catheter from separating when the seal rJ = member is broken, it is preferable that the broken part on the sealing part side has a break line in the circumferential direction, with a part remaining. . The sealing member is preferably formed by forming a groove between the elastic membrane and the cylindrical body, and attaching this to the catheter bar.

In the following, the clasp needle of the present invention will be described in detail with reference to a preferred embodiment shown in the accompanying drawings.

A conventional indwelling needle 1 has a structure as shown in FIG. An inner needle bar 5 attached to one end of the inner needle 4 is attached to the catheter head 3 attached to one end of the catheter 2.
is fitted so as to slightly protrude from the tip of the catheter 2, and a hemostatic plug 6 is plugged at the end of the inner needle nog 5. Such a structure or Utility Model Application No. 55-11973
As mentioned above, the structure disclosed in No. 9 had problems.

Therefore, in the present invention, a sealing member 10 is inserted between the catheter buzz 3 and the inner needle hub 5 (a second
(see figure). The sealing member 10 has an inner cylindrical body 11 and an elastic film 12, and the elastic film 12 has a part k as a broken part.
A fracture line 13 with a thin wall in the circumferential direction (t2<tl) leaving
has.

The breaking line 13 is provided at least at a position other than the inner needle piercing portion of the elastic membrane 12. The sealing member 100 elastic film 12 is preferably made of an elastic material such as silicone rubber or synthetic rubber, and the cylindrical body 11 is not particularly limited to H material as long as it has a certain degree of rigidity. Preferably, it is made of the same material as No. 12. The enclosing member 19 is not limited to the configuration shown in FIG. 3, and may be configured so that a sealing member such as 12 in FIG. 3 used for sealing does not separate from its support member, for example. A membrane 12 can also be provided within the catheter tube 3.

In the indwelling needle 10 of the present invention, which is shown exploded in FIG. 2, in the assembled state as shown in FIG. 1, the left side portion 14 of the sealing member 10 as seen in FIG. An inner needle hub 5 is fitted into the right side portion 15 of the sealing member 10 in FIG. ing.

■Specific operation of the invention Next, the operation of the indwelling needle of the invention will be briefly explained. This indwelling needle has a sealing member 10 as shown in FIG. 4a. In the assembled state shown in FIG. 1, the inner needle 4 pierces the elastic membrane 12 (see g4b4b), and the catheter 2 also protrudes slightly. In this state, the inner needle 4 is inserted into the shunt formed in the patient, and the blood flowing in through the inner needle 4 is visually confirmed with the transparent inner needle bald 5 to confirm reliable puncture. Catheterize 4 and remove from 2. Even if the inner needle 4 is removed, the elastic membrane 12 closes the puncture hole due to its elasticity, so that no blood leaks from this membrane and a hemostasis effect is achieved. Next, the connector 16 on the dialysis circuit side is pushed into the cylindrical body 11 to break the elastic membrane 12.

The elastic membrane 12 is broken along the break line 13 consisting of the thin walled part of the breakage part, and the cylindrical body 11 does not come off either, and the sealing is completely achieved by the close contact between the cylindrical body 11 and the connector 16. (Refer to Figure 2X4c), blood leakage from the sealing part as in the conventional case does not occur during long periods of dialysis treatment.

The effectiveness of the operation of the indwelling needle of the present invention will be explained in detail in comparison with the one using a sealing member of the type disclosed in Japanese Utility Model Application Publication No. 119739/1993, as shown in FIG. 5a.

Note that Figures 5b and 5c are respectively similar to Figures 4b and 4d.
and FIG. 4c. Figures 4 and 5
In the figure, the dimensions are as follows.

1) −=5 zyb, Q=3 rttn,
f,, = 2mm,, L+ = 0.2 m1t
t(1) Regarding the insertability of the connector, the conventional indwelling needle using the sealing member shown in Figure 1g5 has a connector 16.
A considerable amount of force is required to insert it, and the tearing state is radial and unstable. This Jt ni *', J L
In the t4 needle of the present invention using the sealing member shown in FIG. 13
It was confirmed that the connector was easy to insert and the state of breakage was stable.

・2) Sealing properties of connectors The sealing properties of the connectors of the present invention using the sealing member shown in FIG. 4 and the conventional connector using the sealing member shown in FIG. 5 were investigated. What does sealing mean? Connector 162 elastic membrane 12 after inner needle removal
Connector 16 when broken and pushed into cylindrical body 11
This refers to the blood leakage resistance between the connector seal portion 17 and the cylindrical body 11.
The rate at which air leaked from the seal portion 17 when an air pressure of crl was applied was investigated. With the indwelling needle of the present invention, there was no air leakage in 40 tests fJ', but with the conventional indwelling needle, when 100 tests were conducted, no air leakage occurred. In fact, as many as 25 pieces were produced.

From the above test results, it is clear that the indwelling needle of the present invention is significantly superior to conventional indwelling needles in both connector insertability and connector sealability.

(2) Specific Effects of the Invention As is clear from the above explanation, the indwelling needle according to the present invention provides many advantages over conventional similar devices as described above.

(1) It has a sealing property that not only does not cause blood leakage when the inner needle is inserted, but also does not cause blood leakage for a long time when the connector is inserted after the inner needle is removed.

[2] Since the member to be broken when the connector is connected has a thin break line in advance, the break occurs along this part, making it easy to insert the connector and providing good sealing performance. Moreover, by making the break line between the circumferences, the liquid-tightness of the contact area between the connector and the sealing member is excellent.

! :J,] J Since the structure is such that a part of the parts that are broken when connecting the nectar remain, it is safe because it will not come apart and come loose.

(4) In a series of procedures from puncturing the I1"fi needle to connecting it to the dialysis circuit, even after the inner needle is removed, IF bleeding is performed automatically, eliminating the need for the operator to stop the bleeding. Even when connecting the connector afterward, it is sufficient to simply connect the connector without removing the cap or the like as in the conventional case, which improves the efficiency of the procedure for securing the dialysis flow path.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of a conventional indwelling needle, Fig. 2 is an exploded perspective view of the indwelling needle of the present invention, Fig. 3a and f: gab
The figures are a longitudinal cross-sectional view and a cross-sectional view taken along the line III--III in Figure 3a of the sealing member used in the indwelling needle of the present invention, respectively, and Figures 4a and 5a are the sealing members of the present invention and the comparative sealing member, respectively. Longitudinal cross-sectional view, f, 4 b + gl: F
L; and FIG. 5b are longitudinal cross-sectional views and FIG.
Figures and 4r 5 c figures are each 211r! 4a and 5a are vertical cross-sectional views showing the connection state between the sealing member and the connector in FIGS. 4a and 5a; FIG. Explanation of symbols 1. Conventional indwelling needle, 2. Catheter, 3. Catheter hub, 4. Inner needle, 5. Inner needle, 6.
--Zorag, 10... Seal 1F member, 11... Cylindrical body, 12... Elastic body membrane, 13... Break line, 14...
・Catheter tip fitting part, 15... Inner needle hub fitting part, 16... Connector, 17... Seal part Patent applicant Terumo Corporation

Claims (4)

[Claims] (1) A catheter having a catheter buzz, an inner needle hub that can be fitted into the catheter hub, an inner needle inserted into the catheter, and the force aterhag so as to seal the liquid passage of the catheter hub. and an inner needle penetration part through which the inner needle can penetrate in a sealed state with the liquid passage of the catheter buzz closed, and a liquid conveying tube in the absence of the inner needle. and a sealing member for sealing between the catheter bald and the connector, the catheter bald having a predetermined rupture part that is ruptured when a catheter bald of the connector connected to the catheter bald is inserted, and a sealing member that seals between the catheter bald and the connector. Features: Indwelling needle. (2) The indwelling needle according to claim 1, wherein the indwelling needle is configured so that the sealing member and the force-teaching hub do not separate when the sealing member is broken. (3) The indwelling needle according to claim 2, in which the breaking portion of the sealing member has a breaking line in the circumferential direction, leaving only a part. (4) The sealing member has an elastic membrane and a cylindrical body, and the elastic membrane is fitted onto the catheter bald part by the cylindrical body. An indwelling needle as described in any of the above.