CN1178706A

CN1178706A - Medical apparatus and instruments

Info

Publication number: CN1178706A
Application number: CN97117844A
Authority: CN
Inventors: R·J·奥斯特尔林德; L·A·林格伦; H·A·尼尔松
Original assignee: BOC Group Ltd
Current assignee: BOC Group Ltd
Priority date: 1996-08-21
Filing date: 1997-08-21
Publication date: 1998-04-15

Abstract

A medical device comprises a hollow needle 4 of acuti-end 6 used for rip into the skin of patients and a gripper 14 for moving the needle 4 relative to a hub support member 24 between a first ready-for-use position and a second retracted position. The hub support member has a hole 25 for the passage therethrough of the needle 4 and a spring fitting 40, which engages with the needle on a second retracted position, for stopping the end 6 of the needle loopback and through the hole 25, a flexible hollow trunk 23 which extends rearwardly from the hub support member 24, the hollow interior of which trunk is aligned with the hole 25 and through which the needle 4 extends in its ready-for-use position.

Description

Medical apparatus and instruments

The present invention relates to medical apparatus and instruments, particularly relate to and resemble the such medical apparatus and instruments of intravenous injection conduit, this conduit has sharp-pointed end or the tip that is used to thrust patient skin.

The existence that resembles the infectious disease AIDS and the hepatitis has titanic peril, and the medical worker just may be subjected to this danger thrusting the patient skin place with sharp-pointed syringe needle when utilizing the pipe guide medical patient.Many medical workers are by contacting with infected pin (acupuncture) direct or accidental stabbing infected.

The medical worker is unlikely to be subjected to accidental acupuncture in order to protect, and has worked out multiple solution, and the protector that is contained in thus in the conduit can prevent to take place directly to contact with pin after use, thereby has prevented accidental acupuncture.

A kind of known devices that is used for protection pin after use has been done introduction at European patent 5447501.In this document, introduced a kind of transfusion catheter device that comprises the pin of hollow, this needle set has a sharp-pointed end that is used to thrust patient skin.A position of preparing use, this pin is by a hole in the rigid front of elastic component is housed.Elastic component keeps motionless and applies the vertically roughly rectangular power with pin under the lateral tension force effect of pin.In the position of withdrawing from of pin, promptly be passed in the hole in the rigid front and exceed this hole when entering in the main casing when the end of pin returns, this elastic component just reenters in this hole with the end that stops pin along the end of this pin of transverse bias.

This device is a kind of fairly simple and economic device and can effectively occurrent acupuncture danger be reduced to minimum.

But the shortcoming of this known devices is, in case return when being passed in the hole in the rigid front and exceeding outside this hole when the end of pin, can stop blood to be gone in the housing by this orifice flow without any thing.

The object of the present invention is to provide a kind of protector of end of pin of a part that constitutes medical apparatus and instruments, this device comprises and is used for preventing or stops blood to flow into device in the protector of pin.

According to the present invention; a kind of medical apparatus and instruments comprises a pin with hollow of the sharp-pointed end that is used to thrust patient skin; a device that is used between the first preparation use location and second withdraw of the needle protective position, moving this pin with respect to the needle guard supporting member; this needle guard supporting member is formed with the through hole of a passage that therefrom passes through as this pin; and elastic device; this elastic device is meshed with this pin on second withdraw of the needle protective position; return with the end that stops this pin and to pass this hole; it is characterized in that; the hollow pipe of a deflection extends back from this needle guard supporting member, during the inside of the hollow of this pipe is relative with this through hole and this pin reach it by this hole and prepare the use location.

Best, this elastic device takes to have a free-ended elastic arm form, and in second withdraw of the needle protective position of this pin, this arm is meshed the end that makes pin and pipe along laterally moving with the side of this pin, stoped the end of pin to reenter in this hole thus.

To with reference to accompanying drawing one embodiment of the present of invention be described in the mode of example below, in the accompanying drawing:

Fig. 1 makes its syringe needle be in the longitudinal sectional drawing of the transfusion catheter device of preparing puncture position;

Fig. 2 is the enlarged detailed of this pipe guide of Fig. 1;

Fig. 3 is the longitudinal profile that is similar to Fig. 1, but pin is in its protective position among the figure; And

Fig. 4 is the enlarged detailed of the pipe guide of Fig. 3.

As shown in the figure, a transfusion catheter device 1 comprises a needle assembly 2, and this needle assembly comprises a hollow needle 4 with sharp-pointed end 6, and described pin 4 extends forward from needle guard 8.Needle guard 8 is arranged to can slide in housing 10 and comprise a sleeve pipe 12 that is supporting clip 14.Sleeve pipe 12 extends by the slit 16 that forms on housing 10, so that engagement clip 14 makes needle guard 8 do forward and reciprocating motion backward along the length of housing 10.Needle guard 8 be hollow and close by a filter 18, this filter and needle guard 8 define a backflow of blood chamber 20.

Housing 10 front ends by a connection thereon needle guard supporting member 24 and sealed effectively.What extend back from this needle guard supporting member 24 is the hollow barrel-type pipe 23 of a deflection.During the inner through channel 25 with in needle guard supporting member 24 of pipe 23 hollow is relative, so that this passage passes through pin 4.The free end 29 that guard shield 27 also extends back and has a vicinity from needle guard supporting member 24.The front of supporting member 24 is formed with a boss 26 that extends forward that is used for supporting the near-end of cannula assembly 30.As well-known in the prior art, cannula assembly 30 comprises a hollow intubate 32 that is connected on the intubate cover 34.

Elastic arm 40 be installed between needle guard supporting member 24 and the housing 10 and backward (as shown in the figure) between a surface of the outer surface 27 of the inner surface of housing 10, guard shield and needle guard 8, extend.

On the position that the preparation shown in Fig. 1 and 2 is used, needle guard 8 is that the front end that is in housing 10 is close to free end 29 places at guard shield 27.On this position, pin 4 passes hollow barrel-type pipe 23 and the hole on needle guard supporting member 24 25 and passes cannula assembly 30 and extend, thereby makes the end 6 of this pin reach the outside of the far-end freely of hollow intubate 32.

In case patient's skin is pierced, clip 14 is engaged needle guard 8 is moved towards the near-end of housing 10 backward, promptly towards moving in the position shown in Fig. 3.This of needle guard 8 moves and will make pin 4 from hollow intubate 32, withdraws from intubate cover 34 and the hole on needle guard supporting member 24.Simultaneously, when needle guard 8 leaves the near-end freely of arm 40, described arm 40 will compress (as shown in the figure) outside at pin 4 downwards, make thus pin along transverse curvature and not with hole 25 centerings.Pipe 23 will moving and deflection with the end 6 of pin 4.

In this position, cannula assembly 30 can take off from the boss 26 of needle guard supporting member 24.

The distinctive advantage of the foregoing description is that the pin 4 in hollow pipe 23 can prevent or stop blood to flow in the housing 10 effectively.Even the end 6 at pin 4 punctures under the situation of pipe 23, it still can play a part to stop blood to flow into housing 10.

Self-evident, though top illustrated be after pin end 6 leaves passage 25 in the needle guard supporting member 24, elastic cantilever 40 has been realized the transverse movement of pin 4, but in fact any elastic component can use, for example illustrated elastic component in European patent 5447501.

In addition, in order to reduce manufacturing cost, can form as a whole to needle guard supporting member 24 and pipe 23 moulds.

Claims

1. medical apparatus and instruments; comprise a pin 4 with hollow of the sharp-pointed end 6 that is used to thrust patient skin; a device 14 that is used between the first preparation use location and second withdraw of the needle protective position, moving this pin 4 with respect to needle guard supporting member 24; this needle guard supporting member is formed with the through hole 25 of a passage that therefrom passes through as this pin 4; and elastic device 40; this elastic device is meshed with this pin on second withdraw of the needle protective position; return with the end 6 that stops this pin and to pass this hole 25; it is characterized in that; the hollow pipe 23 of a deflection extends back from this needle guard supporting member 24; during the inside of the hollow of this pipe and through hole 25 are relative, and this pin 4 reaches it by this hole and prepares the use location.

2. medical apparatus and instruments as claimed in claim 1; it is characterized in that; this elastic device 40 takes to have a free-ended elastic arm form; this second withdraw of the needle protective position at pin 4; horizontal the moving of end 6 and pipe 23 edges that this arm is meshed with the side of this pin and makes pin stoped the end 6 of pin to reenter in this hole 25 thus.

3. medical apparatus and instruments as claimed in claim 1 or 2 is characterized in that, this needle guard supporting member 24 and this are managed 23 moulds and formed as a whole.

4. as each described medical apparatus and instruments in the claim 1,2 or 3, it is characterized in that this apparatus is provided with a housing 10 that extends back from this needle guard supporting member 24, the hollow pipe 23 of described deflection extends back from the needle guard supporting member in this housing 10.

5. medical apparatus and instruments, its structure and arrange basically with above with reference to illustrated and the fit shown in the accompanying drawing in the accompanying drawing.