UA34496C2 - Needle retraction mechanism - Google Patents

Abstract

The invention is concerned with improvements in or relating to retraction mechanisms for use in fluid handling devices, said mechanisms being arranged to bring about the retraction of a hollow needle into a housing after use. Such devices are used in many facets of the medical field, for the administration of drugs or a drip feed into a blood vessel, or for drawing off liquid samples, for example, blood from patients.

Description

The invention is related to improvements related to suction devices used in devices for introducing and taking liquids, and the indication of the installation device! to ensure the pulling in of hollow needles! in the case after use. Such devices are used in many fields of medicine! for the introduction of medicinal preparations or for drips infused into a blood vessel, or for taking fluid samples, such as, for example, blood from patients.

Lime! according to patents О5 4973316 А, 27.11.90, MI 8900208 А, 16.08.90, 50) 1694146 А1, 30.11.91 devices for introducing and taking liquids used in the field of medicine! for the purpose of administering medicinal preparations, and similar devices for taking blood samples, including devices that can be used to take more than one blood sample from a patient during a period of time.

It is important that the needle! similar devices, which are often subject to vibration after a single use, were brought to a non-working state to prevent accidental injuries! or repeated use with a significant risk of cross-contamination.

Famous syringe! provision of protective devices of various types, which are automatically activated to isolate the needles! after use, as well as a syringe in which the needle is automatically retracted into the body of the device after use.

The closest technical solution known under patent 05 4966593 A, 30.10.90 refers to a device for introducing and taking liquid, containing a node for pulling in a hollow needle! after use, a hollow body part, equipped at one of its ends with an end wall, having a fastening part, including a channel for needles, and a hollow needle, having a fastening means and installed with the possibility of movement between the first position, in which the leading end part needle! protrudes from the front end part of the specified fastening part, and the second position, in which the needle is located inside the hollow body part, and the specified fastening means includes an elastic means that ensures displacement of the needles! in the second, remote position, and the needle is filled with a thickened part in the area separated from its leading end part, and interacting with the retracting means for holding the needle in its first position until the end of use.

The task facing the present invention is to develop a device for retracting the needle, which ensures the prevention of accidental injuries by automatically isolating the needles! after use

The proposed task is solved by the proposed device for introducing and taking liquid, containing a node for pulling in a hollow needle! after use, a hollow body part, equipped at one of its ends with an end wall, having a fastening part, including a channel for needles, and a hollow needle, having a fastening means and installed with the possibility of movement between the first position, in which the leading the end part of the needles! protrudes from the front end part of the specified fastening part, and the second position, in which the needle is located inside the hollow body part, and the specified fastening means includes an elastic means that ensures displacement of the needles! in the second, distant position, and the needle is filled with a thickened part in the area separated from its leading end part, and interacting with the retracting means for holding the needle in its first position until the end of use, and in accordance with the invention, the indicated retracting the device includes a combination of a sealing ring located in the surrounding groove in the specified thickened part, and a clutch adjacent to the end, which is installed with the possibility of pressing forward to move the sealing ring to ensure the movement of the needles from its first position to its second position under the action of the specified elastic means.

The coupling can be fixed to prevent displacement back, when the needle is in its first position, with the help of a protrusion, which is attached to the flange at the front end of the body part.

A compression spring located between the surface of the resistance directed forward, equipped with a fastening part, and the surface of the resistance directed backward, equipped with the front end of the thickened part, can act as an elastic means.

When the needle is in its first position, the sealing ring can be squeezed between the thickened part and the fastening part, which provides a freed part at its front end to accept the sealing ring when it is displaced.

A device for introducing and taking liquid can be a syringe, which has a piston, which, when pressed, can move along the body part to release the liquid contained in it through a needle, and the piston is made in the form of a tube with a closed end, the front end of which is equipped with a stopper element, separated from the end by coupling with the clutch, when the piston moves to the extreme position when pressed, forming a hole at the end through which the needle can pass to enter the piston when it moves to its second position.

The location of the fastening part can be concentric and offset in the direction of the peripheral edge of the body part.

The cross-section of the body part and the piston can be as follows. in order to exclude incorrect assembly relative to the position of the locking element.

The cross-section of the body part and the piston can be such that! provided the possibility of assembly in more than one rotary position relative to each other, their correct operation was guaranteed due to the presence of more than one locking element at the end of the piston.

The body part and the piston can have the shape of an ellipse in cross-section with two separate locking elements at the end of the piston.

The hollow body part may not be intended to accept the piston; and to ensure that the needles are drawn into the device, if necessary, a piston-like tool can be inserted into the body part.

The coupling can be located in a recess, to which access is provided by a part of reduced size at the front end of the tool, adapted to enter the recess and engage with the coupling. This prevents premature withdrawal of needles!

In accordance with the invention, a disposable syringe with a concentric needle is also proposed, having a body part and a piston, the front end of which includes a closing element, the device is displaced at the end of the piston advance to ensure the possibility of a device for retracting the needle, removing the needle and placing it inside the piston for removal ,

The cross-section of the body part and the piston can be such that it excludes incorrect assembly relative to the position of the locking element.

The cross-section of the body part and the piston can be such that! while providing the possibility of assembly in more than one rotational position relative to each other, their correct operation was guaranteed due to the presence of more than one locking element at the end of the piston.

The body part and the piston can have the shape of an ellipse in cross-section with two separate locking elements at the end of the piston.

Also, in accordance with the present invention, a syringe system is proposed, including a set of syringe cylinders with jointly functioning pistons, including a cylinder and pistons of different capacities, and each cylinder is adapted to receive devices for fastening and retraction of the needle, and each piston functions together with the cylinder so that! make up a part that functions together with the device for fastening and retracting the needle, combined with it on the assembly of the piston and cylinder and the device for fastening and retracting the needles; at least one set with an eccentric installation to ensure the possibility of cannulation at an acute angle.

Two examples of the device in accordance with the invention are described below. It is obvious that the description, which should be read with reference to the drawings, is given only as an example, and not as a limiting condition.

Fig. 1 is a side view of a syringe according to the invention in a non-working state.

Fig. 2 is a longitudinal section of the syringe along the line 1I-II of Fig. 1 on an enlarged scale.

Fig. Z is a view of the syringe from the end.

Fig. 4 is a section along lines IM-IM in fig.2.

Fig. 5 is a view from the opposite end, which is a view from the needle end.

Fig. 6 is a section similar to Fig. 1, illustrating an intermediate stage when the syringe piston is pressed.

Fig. 7 is a similar view illustrating the completion of the press weld.

Fig. 8, 9 and 10 are types of fragments on an enlarged scale, respectively fragments 2 and 7.

Fig. 11 is a fragment of the longitudinal section of the device for introducing and taking liquid, used for taking blood samples.

Fig. 12 is a similar view with a needle insertion device inserted into the instrument.

Fig. 13 is a view of the device with its needle in a retracted state.

In fig. 1 shows a disposable syringe 1, containing a hollow body part 2, behind which (the upper end in the projection shown in Fig. 1) protrudes a piston 3. At the lower end of the body part 4 there is a fastening part 4 for needles! 5, having a through channel, at the inner end of which there is an annular rim 6.

The hollow body part 2, which is transparent, is graduated in milliliters for convenience and is equipped with protrusions 7 for gripping with fingers in an ordinary way. The body part 2 has a slightly expanding outward end part 8. The fastening part 4 is fixed to the end wall 9 of the body part 2 in a concentric position 10 (see Fig. 2) to facilitate the use of the syringe while providing the possibility of introducing the needle 5 into the tissue or blood vessel at any desired acute angle.

The inner end of the needle 5 is connected to the thickened part 1 1 by a sleeve having an annular groove 12, in which the sealing ring 13 is located. The sleeve 11 is fastened to the needle, forming a single complex with it.

As can best be seen from Fig. 3-5, the body part 2 and the piston C in the cross section have a z-ellipsoidal shape, which prevents any tendency of unwanted relative rotation of the parts.

Fastening part 4 provides a path for needles! 5 and the first counteraction surface 14 for the elastic means - the compression spring 15 surrounding the needle. The second resistance surface 16 is located at the front end of the thickened part 11. In the assembly, the compression spring 15 is in an almost fully compressed state between the surfaces 14 and 16 and is held in this state by the engagement of the sealing ring 13, which is squeezed between the annular part of the wall 17 of the fastening part 4 and its groove 12, with the end surface 18 of the coupling 19, surrounding the thickened part 11, and including at its rear end the extension 20, formed by protrusions, which directions! inside the hollow body part 2, in the state before use, shown in Fig. 2 and 8.

As can be seen from Fig.8, the front surface of the sealing ring 13 is equipped with an annular chamber

The clutch 19 has a protrusion 22 that engages with the ring flange 23 at the front end of the housing 2, to prevent the clutch 19 from moving back from its original position shown in Fig. 2 and 8

Piston 3 fields, the rear end of which is closed with the help of a cap 24. It should be noted that the largest diameter of the piston is at its rear end 25, that is, in the part adjacent to the end cap 24, and narrows towards the body part of the piston.

The second end of the piston has a structure that provides the reception of the locking element 26, which is included in tight engagement in the piston to form the end wall, which has two zones! 27, determination of fragility lines 28 in such a way that they are easily removed upon contact with protrusions of the extension 20, the explanation of which will be given below. The provision of two such zones 27 eliminates the need to control the position of the outgoing needles! 5 during assembly.

During operation, the syringe for convenience is usually filled with liquid to bring it to a state of readiness for use, during which the piston 3 is inserted a short distance into the body part 2, as shown in Fig.2. Thus, the sealing element 26 of the piston acts as a sealing gasket for the liquid contents of the body part.

At the start of work and displacement of the piston C forward (or down in the projection shown in Fig. 1), the advancing end wall of the shut-off element 25 pushes the liquid through the needle 5. Fig. 9 shows the position of the parts immediately before the end of pushing the liquid. It can be seen that the end wall of the locking element 26 came into contact with the protrusions of the extension 20 of the coupling! 19 and the mufti called for a displacement! 19 forward, as shown in fig.9. However, the liquid can still pass from the body part C into the needle 5 due to the presence of gaps between the protrusions of the extension 20 of the coupling 19. As shown in fig. 10, the movement of the coupling 19, due to its contact with the sealing ring 13, which is located in the groove 12, also caused the forward movement of the thickened part 11, which then compresses the spring 15 to a state of full compression. In addition, the movement involves the release of the sealing ring 13 from being held in the groove 12 by the annular part 17, and its displacement until it enters the annular chamber 21, where it is accepted through the wall of the shoulder 6 of the fastening part 4. Thus, the restriction acting on the end is eliminated of the needle thickened part 11. Now the fully compressed spring 15 has no more limitations and rapidly expands, driving the needle thickened part 11, and consequently, the needle itself, back. The clutch 19 and its extension protrusions 20 together have such a length that ensures their entry into the hollow inner part of the body part 2. Therefore, the extension protrusions create pressure on the zone 27 in such a way that! shift the line of weakness 28. After that, the needle 5 freely passes through the coupling 19 into the hollow inner part of the piston. Thus, it is removed and becomes inaccessible to potential repeat users of the syringe. It should be understood that in practice the piston Z cannot be easily extracted from the housing part 2 to facilitate access to the needle, since the rear end 25 of the piston Z is firmly wedged into the expanding end part 8 of the housing part 2 and, therefore, resists extraction.

Therefore, the syringe can now be thrown away without danger to persons who will come into contact with the needle in the future.

In fig. 11 shows a view of a fragment of the device for withdrawing the needle, indicated by the number 29, which is used in the device for repeated blood sampling. The device includes a casing 30 with an open end, into which is inserted a remote tube 31 of the type of tube sold under the registered trade mark "Masshaipeg", which has a diaphragm 32, which flows through the rear end part 33 of a hollow needle! 34 with two ends in such a way as to ensure the possibility of collecting a sample in the tube 31. For convenience, the needle 34 can remain motionless during the period of time that may be necessary for taking a series of samples, but when the series is completed, the needle must be removed, and after that there are risk factors associated with repeated use of needles!

The device for retracting the needle, shown in fig. 11-13, in many ways similar to that shown in fig. 1-10, and identical parts are indicated by identical numbers.

As mentioned above, the needle 34 has two ends and passes through the thickened part 11.

A recess 35 is formed on the front wall of the casing 30, which has a surface 36 against which the remote tube 31 rests during normal use. Thus, in normal use, as will be shown, there is no contact between the tube 31 and the protrusions of the extension 20

In fig. 12 shows a means by which the needle 34 can be retracted from the working state to a position in which it cannot be used again and cannot cause injury to people in contact with it.

Thus, after taking the last punch, when it is necessary to remove the needle from the patient's forearm, the tool 37 is inserted into the casing 30, as shown in fig. 12. The tool 37 contains a piston-like hollow body part 38 and an annular protrusion or neck 39, which is surrounded by the surface of the ledge 40. The neck 39 has a round hole 41. When the tool 37 is inserted into the casing 30, the rear end part of the needles! 34 enters the opening of 41 necks! 39, and the neck itself enters the recess 35 in the casing 30, the surface of the front edge of the necks! 39 comes into contact with the protrusions of the extension 20, and the continued effect of the pressure applied to move the tool forward, as shown in fig. 12, the clutch moves forward! 19 for displacing the sealing ring 13 and releasing the needles! 34 for its subsequent reset in the tool housing 37. The ring clamp 42, which snaps around the tool 37, guarantees that the tool will not be accidentally removed from the casing 30 until it is safely removed.

As determined by the following claim, within the scope of the present invention! different ego modifications. you

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Circulation of 50 copies.

Open joint-stock company "Patent"

Ukraine, 88000, Uzhgorod, st. Gagarina, 101 (03122) 3-72 -89 (03122)2-57- 03

Claims (1)

1. A device for retracting needles, containing a unit for retracting a hollow needle after use, a hollow body part, equipped at one of its ends with an end wall having a fastener, including a channel for needles, and a hollow needle having a fastener and installed with the possibility moving between the first position in which the leading end part of the needles! protrudes from the front end part of the specified fastening part, and the second position, in which the needle is located inside the hollow body part, and the specified fastening means includes an elastic means that ensures displacement of the needle to the second, remote position, and the needle is mounted with a thickened part in a section separated from its leading end part, and interacting with the retracting means for holding the needle in its first position until the end of use, characterized by the fact that the specified retracting means includes a combination of a sealing ring located in the surrounding groove to the specified thickened part, and a clutch that is installed at the end with the possibility of pressing forward to shift the sealing ring to ensure the movement of the needle from its first position to its second position under the action of the indicated elastic means. 2. The device according to p. 1I, characterized by the fact that it contains a ledge, resting on the flange at the front end of the body part and preventing the movement of the clutch: back when the needle is in the first position. 3. The device according to item I or 2, characterized by the fact that the elastic means is filled in the form of a compression spring, located between the surface of the counteraction directed forward, equipped with a fastening part, and the surface of the counteraction directed backward, equipped with the front end of the thickened part. 4. The device according to any of claims 1-3, distinguished by the fact that when the needle is in its first position, the sealing ring can be squeezed between the thickened part and the fastening part, which provides the released part at its front end to accept the sealing end when it is displaced. The device according to any of claims 1-4, characterized by the fact that it is filled in the form of a syringe with a piston installed in the with the possibility of moving along the body part to draw the liquid contained in it through the needle, and the piston is made in the form of a tube with a closed end, the front of which is equipped with a closing element, which is separated from the end by coupling with the clutch when moving the piston when pressed to the extreme position with the formation of an opening at the end for the needle to enter the piston when it moves to its second position. b. Syringe according to claim 5, characterized by the fact that the fastening part is concentric and offset in the direction of the peripheral edge of the body part. 7 Syringe according to p.b., distinguished by the fact that the cross-section of the body part and the piston are such that they exclude incorrect assembly relative to the position of the locking element. 8. Syringe m.p., characterized by the fact that the cross-section of the body part and the piston have a size that provides the possibility of assembly in more than one rotational position relative to each other, and at the end of the piston there is more than one locking element to ensure proper operation of the syringe. 9 Syringe according to claim 8, characterized by the fact that the body part and the piston in cross-section have the shape of ellipsoids with two separations from each other by closing elements at the end of the piston 10. The device according to any of claims 1-4, characterized by the fact that a piston-like instrument can be located in the body part. 11. The device according to claim 10, characterized by the fact that the coupling is located in a recess, to which access is provided by a part of reduced size at the front end of the tool, adapted to enter the recess for engagement with the coupling.