MXPA96002216A - Catering needle mechanism and detestrabado de campana de cate - Google Patents

Abstract

The present invention relates to a cannula locking mechanism and catheter hood unlocking for a catheter insertion device, characterized in that it comprises: (a) a housing for receiving a cannular needle, said cannular needle extending from one end of said catheter housing and being adapted to deliver a catheter to a patient; (b) a catheter hood support structure adjacent said housing and movable along said cannular needle and embracing a portion of the cannular needle and defining an opening in the same, (c) a catheter slidably mounted on said cannular needle, said catheter including a catheter hood coupled on said catheter hood support structure, and (d) means for locking said catheter hood to said catheter support structure. catheter bell in the extended operative position of said cannular needle and to release said catheter bell in the retracted position of the catheter. cannular needle while concurrently forming a protective barrier against the tip of the retracted cannular needle that is in an exposed condition, wherein the locking means comprises a plate member extending through said opening defined by the support structure of the cannula. catheter hood, said plate element including a central opening through which the cannular needle passes through said opening in the extended operative condition and maintains said plate member in a catheter hood lock condition on said catheter structure. catheter hood support wherein there is a tongue on said housing and said plate member has arm portions extending opposite to one end, one of said arm portions being hingedly connected to a tongue, and another said arm portions including means for securely coupling said catheter hood

Description

MECHANISM OF CUTTING OF CATHETER AND DISTRIBUTION OF CATHETER HOOD BACKGROUND OF THE INVENTION 1. Invention The present invention relates, in general, to intravenous catheter insertion devices, and in particular it relates to a catheter needle tip shield and a safety mechanism that provides automatic fault adjustment protection for clinical personnel against possibility of accidental punctures with an intravenous (IV) needle used by the provision of an automatic catheter needle tip protection structure that becomes operative to the removal of the needle from a patient's body. In addition, the invention is also directed to a catheter bell release mechanism and automatic needle tip protection which simultaneously covers the needle tip to removal from a patient's body while allowing the catheter to remain in the patient's body. site of the venipuncture, and releases a Luer lock tab located over the catheter bell when the needle cannula is fully retracted to place the needle tip into a fully protected condition. In accordance with a further embodiment of the invention, a catheter unlocking mechanism iporating a locking line is also provided, particularly with the use of a cannula or needle guard in the form of a bag or bellows for receiving the needle cannula, and iporates a redundant system adapted to prevent a nozzle assembly of the cannula structure from separating from the cannula and exposing the latter and releasing the catheter bell before full protection of the needle. The use of clinical apparatuses in which the hollow pointed needles or cannulas are used in order to function the skin of a patient, and especially the catheters that use such needles to effect venipunctures, is well known in the medical art and is widely practiced by physicians and clinical staff for the purpose of injecting fluids or drugs directly into the patients' bloodstream. Additionally, during operations or surgical procedures it may often be required that full transfusions of blood and parenteral fluids be administered to a patient undergoing such surgical procedures. Basically, as is well known and has been employed for a considerable time, the introduction of such fluids into the cardiovascular systems of the patients has necessitated the formation of a venipuncture using a hollow rigid needle having a proximal attachment site for a fluid connection that is adapted to interconnect the needle with a source of fluids administered intravenously. The above method of administering fluids to patients through venipunctures has been subject to quite serious problems in the administration of fluids to patients in this medical technology. Thus, a major concern to focus on is the inherent stiffness of the needle, the latter of which is usually made of surgical grade steel, and as long as it is inserted into a patient's vein it needs to be The needle is maintained for safety reasons in a fixed position in the general site of the venipuncture for the duration of fluid or transfusion administration, so that such a procedure could conceivably consume a large amount of time. In addition to the above, it has sometimes been necessary to draw blood samples and / or successively administer intravenous fluids periodically to a patient, thereby requiring the patient to undergo a series or plurality of venipunctures, each administered in a specific moment and in different places on the body, resulting in a relatively traumatic experience for the patient in view of the repeated and somehow painful venipunctures. In order to possibly reduce or even eliminate the previous problems, in medical technology it has been a recent practice to introduce a flexible tubular catheter or a low friction material, such as a silastic or Teflon into the patient's vein and allow the catheter tube to remain in that position for longer periods for the purposes of, for example, periodically administering fluids, including parenteral fluids, blood / plasma transfusions, drugs in liquid form and also the collection of blood samples and the like. In this way, trauma previously encountered in extravasation, and infiltration caused by repeated venipunctures, has been greatly averted, and the damage and discomfort for a patient has been generally overcome by leaving a rigid needle in the body for prolonged periods. Thus in order to place the distal end of said flexible catheter tube within the cavity of a patient's body, such as a vascular cavity or vein, a hollow pointed cannula or needle is normally employed for the purpose of form the venipuncture. Subsequently the flexible catheter tube, which is telescopically and slidably mounted coaxially on the outer circumference of the cannula or hollow needle to extend thereon in the form of a sleeve is advanced along the length of the needle within the vein, subsequent to the needle forming the venipuncture. Subsequently, the needle is adapted to be withdrawn from inside the catheter tube, while allowing the latter to remain inside the patient's body at the site of the venipuncture, and the needle is disposed of properly.

In view of the fact that the needle that has been previously placed in the body of the patient with the formation of the venipuncture may be exposed to infectious agents, for example, such as a patient infected with the Acquired Immuno-Deficiency Syndrome (AIDS) that frequently or practically always of a fatal final nature, or other dangerous infectious conditions such as hepatitis, is present the damage or danger that the clinical staff may be inadvertently or accidentally punctured or punctured with the needle used after removal from the body of a patient, with the possibility of infection or even death as a result of this. Although numerous publications of the prior art are devoted to the development and description of devices for the protection of physicians or clinical personnel against the damage caused by accidental injuries through punctures to the same with needles removed from the bodies of the patients, they have been found difficulties in the production of devices in which the removal of a needle from the body of a patient and the separation of the catheter therefrom automatically activates a needle guard-protection mechanism concurrently. In addition, in accordance with a particular aspect, it is also desirable that concurrently or concurrently with retraction of the used cannula or needle tip portion within a protected or confined area by means of which the safety of clinical personnel is ensured, there is also a disconnection or unclamping action performed automatically from the catheter hood from a locking structure that joins the needle assembly to the catheter. 2. DISCUSSION OF PRIOR ART In a particular case, US Patent No. • +, 631,057 to Mitchell discloses a guard tube adapted to slide forward in order to protect the tip end of a hypodermic needle against accidental contact of personnel clinical after use. However, the mechanism described therein, similar to the current state of the art, is effective only if the clinical staff remembers to push the guard tube into its effective position subsequent to performing an injection. This leaves open the possibility that this step may occasionally be forgotten and may conceivably lead to injury and possible fatal outcomes for the clinician or clinician. In view of the foregoing, it is important to ensure the provision of a safety mechanism that provides automatic fault-setting protection for clinical personnel dedicated to the administration of such venipunctions to patients; in effect, without requiring the need for any conscious foresight on the part of the clinical staff operating the device, and which will automatically protect the tip end of a needle against projection and accidental puncture of the clinical staff from the moment the needle is removal from the patient's body, while maintaining a connection with the catheter until the needle is contained safely.

McDonald's North American Patent No. l +, 9l + l +, 725 addresses the problem by describing an intravenous catheter that incorporates a structure to protect a physician or clinical laborator from accidental puncture that can result in the transfer of potentially dangerous infections to the patient. staff from the patient. The catheter is inserted into the patient's body with the aid of a hollow-edged pointed needle or cannula that is subsequently removed from the patient's body in a protective housing in the absence of needle exposure during any intermediate stage of the procedure of removal. The housing is then locked in place subsequent to removal of the needle, and unlocked from a catheter hood of the tubular catheter in its place subsequent to the moment, when the removal of the needle and the lock are carried out in a continuous movement. .

Another mechanism that is adapted to provide protection of the clinical staff against puncture of the needle tip or the subsequent cannula or during the removal thereof from the body of a patient is described in the North American Patent of Dombro ski et al. No., 790,626, where & A nozzle or cap portion through which the needle extends is locked to a housing by means of a folding locking structure that spans the needle. Subsequent to use, the needle is adapted to be retracted within an axially expanding leaf-shaped arrangement which will safely prevent potential injury to clinicians caused by being stung or punctured by the exposed tip of the used needle. Although this provides an improvement over the current state of the art in relation to needle puncture protection, Dombrowski et al. it requires a frictional coupling of the components in order to be operative, which frequently causes the operation of the device to be difficult and not totally reliable in nature.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, an improved and novel structure is provided in the formation of a cannula or needle tip guard, and particularly in the safety mechanism arrangement adapted for substantially simultaneous protected needle lock and the catheter bell unlocking drive with the removal of the needle or cannula from the catheter. Another embodiment of a catheter unlocking device includes a latching line and is operable to actuate a needle guard arrangement, in which the needle guard mechanism prior to the extension of the locking line retains the catheter hood locked in the guard mechanism. The cannula extends through the catheter bell through a locking element having a central opening for receiving the cannula to maintain a locking engagement between a Luer locking tongue on the catheter bell, and a portion of the catheter. nozzle of a needle guard housing through which the cannula extends forward to be adapted and inserted into the patient's vein. With the removal of the needle or cannula from the patient's body, while allowing a catheter, such as a flexible tubular member that spans the cannula, to slide forward in order to remain in place within the punctured vein of the patient, according to the cannula is withdrawn from the opening in the preferable plastic locking element, the latter of which, seen from an inherently incorporated deflection or elastic action and its construction, is uncoupled from the Luer tongue over the catheter hood while it moves laterally and concurrently from the opening from which the needle has been retracted to form an obstruction against any protrusion of the needle tip or cannula from the housing. This particular action simultaneously allows the separation of the housing and the guard structure covering the needle or cannula exposure used in separating it from the catheter hood.

According to another embodiment of the invention, the plastic locking element can be locked by means of a so-called "fishing line" towards the mass of the catheter and at the opposite end thereof to a housing which already includes a bellows or folded bag, with the needle being extended through the locking element as described hereinabove, whereby the extension of the lock exerts a release traction on the catheter bell.

According to a further embodiment of the invention, a thin flexible bag can form the extension to cover the retracted needle, the latter of which can be locked to the housing and the nozzle cord portion by a flexible corrugated material.

Accordingly, it is an object of the present invention to provide a unique and novel mechanism for simultaneous locking of a needle in a retracted guard position and locking of a catheter hood structure through the simple actuation of a locking element.

Another object is to provide a device or mechanism of the type described herein in which the locking element is interconnected to a housing at one end and respective to a catheter hood at an opposite end by a locking line, which allows the simultaneous unlocking of the catheter bell from the housing and retraction of the used needle tip into a flexible bag or similar guard component in response to the extension of the locking line.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and other objects of the invention and advantages are described herein in further detail below, taken in conjunction with the accompanying drawings, in which: Figure 1 illustrates, in generally diagrammatic form, a fragmentary sectional view through a catheter bell unlocking and unlocking mechanism according to the invention, showing in a first locked and extended needle position thereof; Figure 2 illustrates a view similar to that of Figure 1 with the mechanism being illustrated in the condition of retracted needle and uncapped catheter hood; Figure 3 illustrates a side view of the locking element of the mechanism of Figure 1; Figure k illustrates an end view of the locking element of figure 3; Figure 5 illustrates a top plan view of the locking element of Figure 3; Figure 6 illustrates, in generally diagrammatic form, a second embodiment of a catheter bell unlocking and unlocking mechanism according to the invention showing the interlocking interlocked condition thereof; Figure 7 illustrates the mechanism of Figure 6 in the unlocked and retracted needle condition; Figure 6 illustrates, in generally diagrammatic form, an additional embodiment of a catheter guard locking device; Figure 9 illustrates a sectional view, on an enlarged scale, of the device of Figure 6 taken along line 9-9 of Figure 6; Figures 10 and 11 illustrate, respectively, plan and side views of the locking structure that is used in the device of Figure 6; Figure 12 illustrates, in generally diagrammatic form, a longitudinal sectional view of a modified embodiment of a locking structure; Figure 13 illustrates an end view of the locking structure of Figure 12; and Figures 1W and 15 illustrate, respectively, two operative positions of a modified embodiment of a locking and locking device for a catheter and cannula arrangement constructed in accordance with the invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Referring in detail to the invention, particularly as described in the embodiment of Figures 1 to 5 of the drawings, and especially as shown in Figure 1, a needle lock and unlock catheter lock mechanism is described. The anterior or entry end 12 of needle guard or cannula 1 > + includes a cavity 16 containing a bag or bellows 16, shown in a folded or compressed condition. Extending forward and centrally from the housing 1"+ through a guide sleeve 20 is a hollow cannula or needle 22 adapted to form a venipuncture in a patient, and which also passes through a central opening 2 formed in an element. of lock 26 constructed in accordance with the invention. The extended cannula 22 then passes through a catheter hood 26 having a latching tongue structure Luer 30, which encompasses a mouth piece 32 and a gasket 3U contained therein. The inlet end of the hollow needle or cannula 22 is adapted to be inserted into the body of a patient (not shown) to impart a venipuncture for the administration of appropriate fluids introduced through a catheter (not shown) that encompasses and advances within the puncture along the outer surface of the cannula (not shown). The catheter may be a flexible tubular member terminating at one end in the catheter hood 26 as is well known in the art., and with the formation of the venipuncture through the tip of the cannula or hollow needle 22 is adapted to be slid forward thereon in the patient while the needle or cannula 22 is adapted to be retracted from the catheter into the protective housing 14. The locking element 26 for the catheter hood unlocking and unlocking mechanism, as shown in Figures 3 to 5, comprises a lever-shaped member having a central plate portion 36 having the opening 24 through which the cannula 22 is inserted to project forward during the locked condition of the components; with the plate portion 36 being located on a ramp with an extended forward end of the plate portion 36 that includes a T-shaped structure 36. An arm 40 of the T-shaped structure engages an outgoing tab arrangement 42 on the front surface of the housing 14 containing the folded or compressed pouch or bellows; while the other arm 44 of the T-shaped structure 36 includes a projection similar to a hook 46 that forms a recess 46 into which a Luer locking tab 50 engages forming an integral component of the catheter bell 26 to keep the components in their intertrawed condition as shown in Figure i of the drawings. With the venipuncture insertion of the tip portion of the needle or cannula 22 into the patient's body and the forward sliding thereof of the flexible tubular catheter within the site of the venipuncture, the cannula 22 is retracted, as shown in FIG. Figure 2 of the drawings, while leaving the catheter in place. As the cannula 22 is retracted from the catheter through the central opening 24 in the plate portion 36 of the locking element 26 for the catheter hood 26, the spring action or deviation of the plastic material from the T-shaped structure causes it to pivot or flex at location 54 to cause opening 24 to move upwardly and plate portion 36 to form a barrier preventing the tip of retracted cannula 22 from extending beyond the guard portion of nozzle of the housing. Simultaneously, the flexing action of the plate portion 36 decouples the Luer tongue 50 from the recess 46 in the opposite arm 44 of the T-shaped element, thereby releasing the catheter hood 46 and thereby allowing the components cannula and guard housing 14 with the cannula retracted therein and the needle lock and unlock catheter lock mechanism attached thereto to be removed and to provide the connection capability of a cooperating Luer lock structure ( not shown) to the catheter hood 26 which allows administration of parenteral fluids, blood or medicaments to the patient through the venipuncture catheter which remains attached to the catheter hood 26. The mechanism 10 comprises the plate element in T shape, as shown in Figures 3 to 5 of the drawings, includes a lip 56 having recess 46 formed therein for retaining the Luer lock tab 50 and with the Distant end 60 of plate portion member 36 including opening 24 for passage therethrough of cannula T2 including a pressure tab 60 which will prevent plate 36 from fully releasing and detaching to the release caused by Removal of the needle tip. This structure essentially provides a safety guard mechanism for the cannula needle 22 and retains the catheter hood 26 secured thereto until after the guard mechanism comprising the T-shaped element 36 is securely placed on the tip of the withdrawn cannula 22. The mechanism simultaneously releases the catheter hood 26 and covers in a protective manner the tip of the used cannula 22 possibly generating a loud sound to provide an audible indication that the cannula is secured against external contact and the catheter components are separated from it. The element forming the mechanism 10 may be constituted of a suitable plastic material, such as acetyl or the like and essentially forms a so-called "actuator" with the tip of the retracted cannula 22 vacating the cannula opening 24 formed in the portion in the form of plate 36 of the mechanism, simultaneously keeping the cannula retracted and releasing the catheter hood 26. Referring to the diagrammatically illustrated embodiment of figures 6 and 7 of the drawings; where similar elements as those in Figure 1 are identified by the same reference numbers, in essence, the mechanism 70 for decoupling the catheter hood 26 from the housing 14 can also be constituted by a component in the form of a plastic plate 72 having a recessed hook portion 74 at one end 76 and wherein the plastic material is of a nature in an elastic way. The hook portion 74 is interconnected to the catheter hood by means of coupling on a Luer lock tongue 50 through a so-called "fishing line" or rolled lock 76 attached at 60 to a projection 62 on the component 72. and at an end opposite a flange 64 on the housing device 14. The lock 76 is essentially in a loosely wound position in the extended needle condition, and when the cannula 22 is retracted with a cannula guard comprising a folded bag or compressed bellows 66 located between the housing 14 and a guard mouthpiece that is fully extended to cause the needle tip of the cannula to be removed therefrom, the fully extended "fishing-line" lock 76 deforms or flexes the component 72, to release the Luer lock tab 50 on the catheter hood 26, as shown in Figure 7, allowing the catheter hood 26 to be stopping the cannula assembly comprising the housing 14 and the mechanism 76 and 72. The used cannula 22 is contained within the extended pouch or bellows, and secured and stored in this way against potential contact by a physician or clinical staff . As shown in the embodiment of Figs. 6 to 10 of the drawings which is somewhat similar to that of Figs. 6 and 7, a thin pair of notches 90 from an individual loop member 92 constituting two limbs of a loop interconnecting a housing 94 and a catheter hood with a Luer lock tab. Attached to the components extending between the housing 94 and a nozzle or guard member 100 is a thin flexible bag 102 which, with retraction of the cannula 22, incorporates a guard for the retracted cannula and its needle tip. Hereby, the device forming the notch can be a thin-walled structure, as shown in Figure 9, which as it is attached deviated from a central axis will prevent rotation or twisting between the components during the operation t avoiding, in effect, the rotation of the nozzle member / guard 100 relative to the housing 94 while firmly anchoring the first to the second. As shown in figures 10 and 11, the notches 90 forming the two ends of a loop 92 can be manufactured by molding, stretching and orienting techniques to produce a notch of highly resistant linearly oriented plastic material. Various plastics, including polyolefins and nylons lend themselves easily to this particular molding technique. The notch is adapted to be attached to the housing 94 and, respectively, the nozzle / guard member 100, and folded into a compartment behind the housing. Particularly as shown in Figure 12 of the drawings, a locking support structure 110 connected to a compressed pouch or tube 112 in the housing is illustrated, and this evidences that the notch may be rolled together in the position below a chamber of blood 116, as shown in the representation of figure 13 of the drawings. In accordance with the embodiment shown schematically in Figures 14 and 15 there is shown a structure of some modified mode of the arrangement of Figure 12, whereby in this case, the lock 120 may be a film or yellar band having a orifice 122 formed in the center thereof to allow passage therethrough of the cannula 22, the latter of which extends through a needle tip guard 124 and Luer lock 126 and with the retraction of the cannula causes the mylar strip to be deflected towards the cannula by the needle tip guard and the housing components so as to maintain it along the cannula, as the cannula passes through the tip guard during retraction. As illustrated, the bonding of the band or mylar may be mechanical in nature, such as press fit, heat stacking or other normal means of attachment. The particular use of the two mylar strips also avoids or resists the twisting or rotation of the needle tip guard relative to the accommodation portion of the arrangement. From the foregoing, it becomes readily apparent that the invention is directed to novel and unique mechanisms for simultaneous locking of a cannula and unlocking of a catheter hood while providing protection for a retracted cannula. While the preferred embodiments of the invention have been shown and described, of course, it will be understood that various modifications and changes in form or detail can be easily made without departing from the spirit of the invention. It is, therefore, intended that the invention is not limited to the exact form and detail shown and described herein, nor to anything less than the entirety of the invention described herein as claimed below.

Claims (7)

NOVELTY OF THE INVENTION CLAIMS

1. A cannula locking and uncapping catheter bell mechanism for a catheter insertion device, comprising: (a) a housing for receiving a cannular needle, said cannular needle extending from one end of the housing and being adapted to deliver a catheter to a patient; (b) the catheter hood support structure encompassing a cannular needle extending from said housing; (c) a catheter slidably mounted on the cannular needle, the catheter including a catheter hood coupled on said catheter hood support structure; and (d) means for locking said catheter hood to the catheter hood support structure in the extended operative position of the cannular needle and to releasing the catheter hood in the retracted position of the cannular needle while concurrently forming the protective barrier against the tip of the retracted cannulated needle that is in an exposed condition. A mechanism according to claim 1, further characterized in that the locking means comprises a plate member extending through an opening in the catheter hood support structure, the plate member including a central opening through means from which the cannular needle passes through said opening in the extended operative condition and maintains the plate member in a catheter bell lock condition on the catheter hood support structure. 3. A mechanism in accordance with the claim 1, further characterized in that the plate member has arm portions extending opposite one end; one of said arm portions being hingedly connected to a tongue on said housing, and the other end including means for securely coupling the catheter bell. A mechanism according to claim 1, further characterized in that at least a portion of said plate member is elastically deformable wherein the removal of the cannular needle from the central opening imparts a pivotal movement to the plate member causing said means at the other arm end are decoupled from the catheter hood to allow the catheter to be separated from said device. 5. A mechanism in accordance with the rei indication 1, further characterized in that the pivotal movement of the plate member displaces the central opening relative to the axis of the retracted cannula needle to form a protective barrier against external contact with said retracted cannular needle. 6. A mechanism in accordance with the rei indication 3, further characterized in that the means of restraint on the other arm of the plate element comprises a recess, and locking tab means on the catheter that is engageable in said recess. 7. A mechanism in accordance with the claim 6, further characterized in that the locking tab means comprise components of a Luer lock fitting. 6. A mechanism according to claim 2, further characterized in that the plate element is constituted of a plastic material. 9. A mechanism according to claim 1, further characterized in that the expandable connection means ipterconnect the catheter hood locking means and the housing, wherein the displacement of said housing from the locking means causes the cannular needle to be retract and said connecting means extends to decouple the locking means from the catheter hood. 10. A mechanism according to claim 9, further characterized in that the connection means comprise a locking line having opposite ends joined respectively to the locking means and to the housing. 11. A mechanism according to claim 9, further characterized in that the locking means comprise an elastically deformable plate member., and a recess formed in one end of the plate member for engaging the locking tongue means over the catheter bell. 1

2. A mechanism according to claim 11, further characterized in that the extension of the connecting means deflects the plate member to allow the tongue means to disengage from the recess and release the catheter hood from the device. 1

3. A mechanism according to claim 9, further characterized in that a foldable bag or bellows comprises the retracted cannular needle with the extension of the locking means. A mechanism according to claim 9, further characterized in that a nozzle guard is locked to said housing, and a foldable bag or bellows extends between the nozzle guard and the housing to encompass the retracted cannular needle. 15. A mechanism in accordance with the claim 14, further characterized in that a pair of strips extending parallel form a lock between the nozzle guard and the housing. 16. A mechanism in accordance with the claim 15, further characterized in that the strips are portions of a ringed notch.