DE202015101591U1 - Medical measuring wire - Google Patents

Abstract

Medical measuring wire comprising a core wire (10) and having at least one measuring area (103), characterized in that the measuring wire (1) has a guide tip (11) at the distal end, the measuring area (103) proximal to the guide tip (11 ), and in that the core wire (10) has radiopaque markers (100) in the measuring region (103) at at least two positions spaced apart from one another over the length of the core wire (10).

Description

The present invention relates to a medical measuring wire.

Guidewires are used particularly in minimally invasive surgery to bring medical devices such as catheters or stents over these guide wires into vessels or organs of the patient. In addition, guide wires from endoscopy are known.

To allow accurate positioning of the guidewire, it is known to provide a marker at the distal end of the guidewire. This marker may be, for example, a ball of radiopaque material.

In addition, guide wires are known in which markings are provided over the length of the guide wire. These are incorporated in a sheath of the guidewire or applied to this. Such a guide wire is for example in the EP 1 208 868 A2 described. In this case, the markings represent, in particular, spiral-shaped color markings which can be recognized by an optical lens of an endoscope.

A disadvantage of these known guidewires is that in procedures in which the guidewire is to be used and which are performed without the use of an endoscope, the recognition of the markings is not possible. In addition, the markings are not suitable due to their spiral arrangement to give the physician an indication of a length or a distance.

Object of the present invention is therefore to provide a solution that is suitable for easy measurement of lengths or distances in the body of the patient and allows easy production.

The invention is based on the finding that this object can be achieved by integrating a measuring scale in a measuring wire which is radiopaque.

According to the invention, the object is therefore achieved by a medical measuring wire, which comprises a core wire and has at least one measuring range. The measuring wire is characterized in that the measuring wire has a guide tip at the distal end, the measuring area is proximal to the guide tip, and that the core wire has radiopaque markers in the measuring area at at least two positions spaced apart from each other over the length of the core wire.

For the purposes of the invention, a medical measuring wire is a medical device by means of which lengths or distances in the body of a patient can be measured. In particular, vascular vessel sections can be measured with the measuring wire, that is, its length can be determined. The measuring wire according to the invention comprises a core wire, which is also referred to as a wire core. The core wire has a length which corresponds to the length of the measuring wire or is slightly smaller than the length of the measuring wire. The core wire consists of a medically compatible material, such as stainless steel. Due to the small diameter of the core wire, which may for example be in the range of 0.3 to 1 mm, preferably in the range of 0.35 mm to 0.89 mm, the core wire has a certain flexibility, on account of which the measuring wire passes through vessels in the body of the patient can be performed.

The measuring wire according to the invention has a guide tip at the distal end. Here, the guide tip is the region of the measuring wire in which the elasticity is greater due to a reduced diameter and / or due to another material than in the remaining region of the measuring wire. The guide tip is preferably formed at least partially by a spiral.

According to the invention, the measuring range of the measuring wire is proximal to the guide tip. In this case, the measuring region can directly adjoin the proximal end of the guide tip or be spaced apart from the proximal end of the guide tip.

For the purposes of the present invention, the distal end of the measuring wire is the end which, on insertion of the measuring wire into the patient, faces away from the doctor. The term "proximal end" refers to the end which lies opposite the distal end and faces the doctor and over which the physician generally actuates, ie shifts and positions the measuring wire. According to the invention, the indications distal and proximal are used in such a way that distally designates the direction which faces away from the physician and proximally the direction which faces the doctor.

In the case of a measuring wire according to the invention, the guide tip is generally inserted further into the vessel than the site to be treated, for example a diseased vessel section. By the measuring range of the measuring wire according to the invention is located proximal to the guide tip of the measuring wire, this is suitable to measure a vessel section with completely inserted measuring wire, since this is also proximal to the position of the Guide tip of a fully inserted measuring wire is located.

According to the invention, the core wire has radiopaque markings in the measuring area on at least two positions spaced apart from one another over the length of the core wire. As radiopaque markers markings are designated, which can be made visible by X-rays. The markings are preferably circumferential markings, that is, extend over the entire inner or outer circumference of the core wire. By according to the invention, the markings are not pure optical markings, the provision of an optical device in the vicinity of the markings, in particular the introduction of an endoscope into the vessel of the patient is not required. The markers can rather be displayed on a screen to a doctor. Since the physician observes and controls the entire procedure via a screen during a minimally invasive procedure, monitoring or recognition of the markings thus does not represent an additional working step for the physician.

In the measuring area radiopaque markers are provided at least two spaced over the length of the core wire positions. By providing at least two markings whose distance is known to the physician, the measuring range can be used as a comparative measure and can be read by the physician in a simple manner a length of a vessel distance. The markings are attached to the core wire. This has the advantage that it can be easily processed and thereby the manufacture of the measuring wire is simplified.

According to one embodiment, the core wire has a constant diameter from the proximal end of the measuring wire to the proximal end of the guide tip. In particular, the core wire in its treated form, that is to say after the application or insertion of the markers, does not have a taper in the area from the proximal end of the measuring wire to the proximal end of the guide tip. In contrast, in the region of the guide tip, the core wire may have a tapering end, on which, if appropriate, a spiral is applied. By having a constant diameter in the region between the proximal end of the measuring wire and the proximal end of the guide tip, the stability of the measuring wire is improved. Thus, the measuring wire can also be used to insert medical devices such as catheters or stents over this measuring wire. The measuring wire in these cases represents a guidewire, which can also be used for measuring. This embodiment, in which the measuring wire is also suitable to serve as a guide wire, is advantageous because an exchange of wires is not required and thus the duration of the engagement can be shortened.

According to a preferred embodiment, more than two markings are provided at predetermined distances from one another in the measuring area. While two markings provided at a predetermined distance from one another on the core wire can already be used to compare the given distance with the length of a vessel section, when more than two markers are provided, several lengths can be compared and read by the position of the markings ,

According to a preferred embodiment, more than two markings are provided in the measuring area and between two adjacent markings in each case the same distance exists. As a result, a scaling is created, which allows a precise reading of a length of a vessel portion, according to the use of a ruler. In addition, when manufacturing or applying markings on or in the core wire at equal intervals, the production of the measuring wire is simplified. The markings are preferably located at least at the distal region of the core wire, so that they lie in the inserted state of the measuring wire in the immediate vicinity of the vessels or organs to be measured and a measurement can therefore be carried out reliably. For example, twenty marks may be provided in the scale. The length of the individual markings and the length of the distances between adjacent markings may be, for example, 1 cm. However, it is also within the scope of the invention, the markers and / or distances between adjacent markers shorter, for example, with a length in the range of 0.5 cm to 0.9 cm.

According to one embodiment, the measuring range extends from the proximal end of the guide tip to the proximal end of the measuring wire. In this embodiment, the measuring area thus covers the entire area of the measuring wire, which does not include the guide tip. This embodiment is advantageous because, on the one hand, the production is simplified, that is to say the core wire can be provided with markings over its entire length. On the other hand, at a measuring range which extends to the proximal end of the measuring wire, vessel sections can be measured at any distance from the guide tip. In addition, several vessel sections can be determined simultaneously.

According to one embodiment, the core wire of the measuring wire is in the measuring range at least partially surface treated. In particular, the core wire is preferably surface-treated in the area of the marking with markings provided on or in the outside. By producing the mark by surface treatment of the core wire, its manufacture is simplified. In particular, the separate application and shrinking of rings as markings is not required.

According to one embodiment, the surface treatment in the region of the markings constitutes a depression. In the region of the markings, depressions are made in the outer circumference of the core wire which are filled up with X-ray-visible material. The wells can be milled or etched. The X-ray-visible material can be introduced as a powder or as a paste in the wells. Preferably, the diameter of the core wire is constant after the introduction of the markers over its length. By this type of introduction of the markers in the core wire larger amounts of radiopaque material can be used as a marker, without that remain after the provision of markings increases on the outer wall of the core wire, which could hinder insertion of the wire or lead to injury to the patient could. The greater amount of X-ray visible material can ensure that the markings in the inserted state of the measuring wire in the vessel of the patient for the doctor are clearly visible.

According to an alternative embodiment, the at least one marking is a coating of the core wire, in particular a vapor deposited, by bath coating or by sputtering applied to the core wire coating. The distances between the markings can be covered by masks, for example, in such surface treatment methods. An advantage of these coating methods is the low layer thickness which can be applied by the methods. As a result, elevations that could arise due to the coating in the area of the markings can be minimized. In addition, the application of coatings can be carried out in continuous processes, which further simplifies the production of the wire.

Alternatively or in addition to the application or introduction of markings on or in the outer side of the core wire of solid material, according to another embodiment, the core wire comprises a hollow wire and the at least one mark is disposed in the lumen of the hollow wire and constitutes a marking element, preferably of wire material ,

According to the invention, a hollow wire is a wire in which a preferably continuous lumen extends between the distal end and the proximal end. The hollow wire can therefore also be called Hypertube. By the at least one mark is introduced into the hollow wire, the production of the measuring wire is further simplified. In particular, the length of the markers and the untreated areas present between the markers can be readily produced by cutting wire elements of an X-ray visible wire material and wire elements of a wire material that is not radiopaque, and alternately inserting into the lumen of the hollow wire the measuring area. In addition, by the introduction of the markings in the lumen of the hollow wire processing of the outside of the hollow wire is not required and applied to the hollow wire protective layer can be reliably applied uniformly on the outside of the hollow wire.

According to one embodiment, at least five wire elements are introduced into the lumen of the hollow wire, of which at least two wire elements are marking elements made of a wire material made of X-ray-visible material.

According to one embodiment, in the lumen of the hollow wire from the proximal end of the hollow wire, a filler wire, at least two marking elements are arranged with at least one intermediate element which is arranged between the marking elements and at least one tip element.

The filler wire is the wire element which extends from the proximal end of the core wire to the proximal end of the measuring range. The cored wire therefore represents the longest wire element in the lumen of the hollow wire. By using a hollow wire with wire elements provided therein as the core wire, the stability or rigidity of the core wire can be adjusted according to the intended use of the measuring wire. In particular, the material of the filler wire can be chosen so that the stiffness of the measuring wire over the greater part of its length is set according to the use.

In addition to the cored wire, at least two marking elements with at least one intermediate element, which is arranged between the marking elements, are preferably provided in the lumen of the hollow wire. The marking elements and the intermediate elements together form the measuring range of the measuring wire. At the distal end of the hollow wire is preferably a tip element in the hollow wire at least partially brought in. The tip member extends from the distal end of the measuring area to the distal end of the hollow wire and protrudes beyond the distal end. On the supernatant of the tip element, a spiral may be applied. The coil may be connected to the distal end of the hollow wire and / or to the outside of the tip member, that is, attached thereto. For example, the spiral may be welded to the hollow wire and / or tip member.

By this construction, it can be ensured, on the one hand, that the entire lumen of the hollow wire is filled with wire elements and so a bending of the hollow wire is not to be feared. On the other hand, due to the filling of the hollow wire consisting of different wire elements, stiffness in different areas of the core wire can be set differently and, on the other hand, the optical properties, in particular the radiopacity of the markings in the measuring area, can be easily achieved.

According to one embodiment, the wire elements are connected to each other, preferably welded. This allows the wire elements to be received in the hollow wire to be inserted as a single component in the hollow wire.

According to a further embodiment, a protective layer is applied to the core wire at least in the measuring area. This protective layer is preferably applied to the core wire over its entire length. The protective layer may consist, for example, of PTFE (polytetrafluoroethylene) or ePTFE (expanded polytetrafluoroethylene). The application of a protective layer on the one hand prevents mechanical damage to the markings during handling of the measuring wire inside and outside the patient's body. On the other hand, by the protective layer and the lubricity of the measuring wire can be improved. Thus, the insertion of the measuring wire into a vessel of a patient, for example in a blood vessel is simplified and the risk of injury to the patient is reduced. In the present invention, it is possible to apply the protective layer on the markers, since the markings are formed by radiopaque material. Physical contact with the markers is therefore not required for their recognition. In addition, opaque materials such as PTFE or ePTFE can be used in the inventive method as a material for the protective layer, as well as a direct optical detection of the marks, that is without X-rays, is not required.

The markers may consist, for example, of tungsten, gold, platinum, bismuth, tantalum, barium sulfate, niobium, palladium, silver or iridium or an alloy thereof.

According to one embodiment, the guide tip is formed by a spiral which is connected to the core wire. The spiral can in this case be attached to the distal end of the core wire. Preferably, however, the coil is slid onto a tapered region at the distal end of the core wire. In this embodiment, the guide tip thus consists of the spiral and the lying in this tapered region of the core wire. This configuration of the guide tip or by forming the guide tip purely as a spiral, the distal end of the measuring wire is given a flexibility that simplifies the insertion of the measuring wire into a vessel, in particular a blood vessel and reduces the risk of injury to the patient.

In the embodiment of the measuring wire in which the core wire comprises a hollow wire, the guide tip may be formed by a projection of a tip element, which is introduced into the lumen of the hollow wire, and a spiral surrounding this and extending beyond this protrusion.

The invention will be explained in more detail below with reference to the accompanying drawings. Show it:

1 : a schematic representation of the distal region of an embodiment of the measuring wire according to the invention;

2 a schematic representation of the distal region of a further embodiment of the measuring wire according to the invention;

3 a schematic representation of a further embodiment of the measuring wire according to the invention;

4 a schematic representation of a further embodiment of the measuring wire according to the invention;

5 a schematic sectional view of the measuring range of a further embodiment of the measuring wire according to the invention;

6 a schematic sectional view of the measuring range of a further embodiment of the measuring wire according to the invention; and

7 : A schematic representation of a measuring wire, which is inserted into a vessel.

In 1 is the distal region of an embodiment of the measuring wire according to the invention 1 shown. The measuring wire 1 consists of a core wire 10 and a leadership tip 11 , The core wire 10 has a tapered area in the distal area 101 on.

In the distal area becomes the measuring wire 1 through the leadership tip 11 educated. The leadership tip 11 is at least on the outside by the spiral 110 educated. The proximal end of the spiral 110 is at the transition to the tapered area 101 with the core wire 10 connected, in particular welded. But it is also possible the spiral 110 at the distal end of the core wire 10 fasten, in particular to weld there. The length of the spiral 110 may be greater than the length of the tapered area 101 , This will cause the distal area of the guide tip 11 of the measuring wire 1 only through the distal part of the spiral 110 educated. The distal area of the spiral 110 can, as shown in the figures, be straight. But it is also within the scope of the invention, the distal end of the spiral 110 bent, for example, bent by 180 ° or rolled up to design.

The spiral 110 For example, it may be made of stainless steel, nitinol or other material suitable for medical technology.

To the proximal end of the guide tip 11 closes the measuring range 103 of the core wire 10 at. In the measuring range 103 are marks 100 on the core wire 10 intended. The marks 100 are preferably circumferential markers 100 that is, extend over the entire circumference of the core wire 10 , The length of the markings 100 is compared to the length of the core wire 10 small dimensions. The marks 100 For example, they can be 1 cm in length. Between the marks 100 there is a distance in each case in which an untreated area 102 of the core wire 10 is present. In the area of untreated areas 102 lies the material of the core wire 10 without marking material. As an untreated area 102 In particular, the area is designated between the marks 100 is located and where no marking material is provided. For the preparation of the measuring wire, however, in the untreated area 102 For example, be applied to a mask. In the illustrated embodiment, the length of the untreated areas 102 greater than the length of the marks 100 , However, it is also within the scope of the invention that the length of the untreated areas 102 less than the length of the marks 100 or that the length of the markings 100 equal to the length of the untreated areas 102 is.

In 2 is a schematic representation of the distal region of another embodiment of the measuring wire according to the invention 1 shown. This embodiment differs from that in FIG 1 shown embodiment in that on the core wire 10 and the top management 11 a protective layer 12 is applied. The protective layer 12 can for example consist of ePTFE. In deviation from the 2 It is also possible that on top of the management 11 no protective layer 12 is provided. Furthermore, the protective layer 12 also instead of the entire area between the proximal end of the guide tip 11 and proximal end of the measuring wire 1 also only the measuring range 103 that is the area where the markers are 100 are intended to cover. The protective layer 12 but in any case is over the entire circumference of the core wire 10 applied.

In 3 is another embodiment of the measuring wire according to the invention 1 shown. In this embodiment, the measuring range extends 103 of the core wire 10 in which the marks 100 alternating with untreated areas 102 are provided, over the entire length of the core wire 10 between the proximal end of the measuring wire 10 and the proximal end of the guide tip 11 ,

In 4 is another embodiment of the measuring wire according to the invention 1 shown. This embodiment is different from the 3 shown embodiment in that the measuring range 103 of the core wire 10 in which the marks 100 alternating with untreated areas 102 are provided, only over part of the length of the core wire 10 between the proximal end of the measuring wire 10 and the proximal end of the guide tip 11 extends. The measuring range 10 also lies from the proximal end of the guide tip 1 spaced in the proximal direction.

In 5 is a sectional view through an embodiment of the measuring wire according to the invention 10 in the measuring range 103 shown. In this embodiment, the marks are 100 not on the surface of the core wire 10 applied, for example vapor-deposited, but lie in depressions 104 in the lateral surface of the core wire 100 , The wells 104 represent circumferential grooves, which at intervals to each other in the lateral surface of the core wire 10 are introduced. In the lower half of 5 are the depressions 104 shown without marking material. The indentations thus introduced 104 are then filled with a marking material and so the markings 100 educated. Between the marks 100 lie untreated areas 102 ,

In 6 is a sectional view of another embodiment of the measuring wire according to the invention 1 shown. In 6 is only the distal area of the measuring wire 1 shown. In this embodiment, the core wire comprises 10 a hollow wire 106 with an inner lumen extending along its length. In the lumen are wire elements 105 introduced, which fill the lumen. From the proximal end (not shown) of the measuring wire 1 out first extends a cored wire 1054 , At a distance to the distal end of the hollow wire 10 closes to the filler wire 1054 the measuring ranges 103 at. This measuring range 103 is by alternately provided marking elements 1051 and intermediate elements 1052 educated. The intermediate elements 1052 correspond to the untreated areas described above 102 the further embodiments. The marking elements 1051 exist at the in 6 shown embodiment of a radiopaque material. To the distal end of the measuring range 103 closes in the lumen of the hollow wire 106 a lace element 1053 at. The lace element 1053 protrudes over the distal end of the hollow wire 106 out. The supernatant of the tip element 1053 is from a spiral 11 surrounded at the distal end of the hollow wire 106 and / or on the tip element 1053 is attached. In the illustrated embodiment is on the outside of the core wire 10 that is on the outside of the hollow wire 106 a protective layer 12 applied, which may for example consist of a plastic, such as PTFE.

In 7 is a schematic representation of an embodiment of the measuring wire according to the invention 1 shown in the introduced into a blood vessel G state. At the main blood vessel G is in 7 schematically a defect in the form of aneurysm A shown. To relieve this and prevent failure of the main blood vessel G, a vascular prosthesis (not shown) is introduced. The vascular prosthesis should be positioned so that it covers the aneurysm A. To the branching of the main blood vessel G vessels, which can also be referred to as outlet vessels and in 7 For example, if the renal arteries do not occlude through the vascular prosthesis, it may be necessary to use a vascular prosthesis that has a length that covers only the aneurysm A. In order to be able to select the suitable vascular prosthesis, the doctor can use the measuring wire according to the invention 1 use. This one will, as in 7 shown schematically, inserted into the main blood vessel G until the management tip 11 distal to the aneurysm A. Based on the markings 100 in the measuring range 103 The physician can now read the length of the aneurysm A using X-rays and select the appropriate vascular prosthesis. This vascular prosthesis can then over the measuring wire still in the vessel 1 be inserted so that the measuring wire 1 additionally serves as a guide wire and can also be referred to as such. Even during the introduction of the vascular prosthesis, the measuring range can serve as a reference for the physician and thus enable an exact positioning of the vascular prosthesis.

The figures are not to scale. The measuring wire 1 may, for example, have a length of 2.50 m and the length of the guide tip 11 can be 50cm, for example. The marks 100 For example, each may have a length in the range of 0.5 cm to 10 cm, preferably in the range of 0.5 cm to 1.5 cm. According to one embodiment, the length of the individual markings 100 in the measuring range 103 for example, 1cm each.

The diameter of the core wire may, for example, be in the range of 0.3 to 1 mm, preferably in the range of 0.35 mm to 0.89 mm. If the core wire comprises a hollow wire, the lumen provided in the hollow wire preferably has a diameter in the range from 0.2 mm to 0.8 mm, preferably 0.22 mm to 0.7 mm.

The core wire may be a solid wire of stainless steel, nitinol or other medically acceptable material or may include a hollow wire of such material into which wire elements are inserted. The filling element as well as the intermediate elements and the tip element, which may be received in the hollow wire, may also be made of stainless steel, Nitinol or other medically acceptable material.

The invention is not limited to the illustrated embodiments. For example, more or less than the marks shown 100 and untreated areas 102 in the measuring range 103 be provided.

The present invention has a number of advantages. In particular, it is possible with the present invention to carry out an intravascular measurement of vessels and / or organs and in particular to determine their length. In addition, for example, vessel distances can be determined. This is important, for example, for determining the length of a prosthesis to be introduced into the vessel. In this case and in other steps which make it necessary to determine the length of a vessel and / or organ and / or a vessel distance, the use of separate measuring catheters when using a measuring wire according to the invention is thus no longer necessary. Rather, in addition to the measurement, the measuring wire can also be used to guide a prosthesis or another medical device. Thus, the entire procedure on the patient is simplified and the duration of the procedure is shortened.

LIST OF REFERENCE NUMBERS

1

 measuring wire

10

 core wire

100

 mark

101

 tapered area core wire

102

 untreated area

103

 measuring range

104

 deepening

106

 hollow wire

105

 wire element

1050

 cored wire

1051

 marker

1052

 intermediate element

1053

 tip member

11

 leadership

110

 spiral

12

 protective layer

A

 aneurysm

B

 branching vessel

G

 main vessel

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1208868 A2 [0004]

Claims (16)

Medical measuring wire containing a core wire ( 10 ) and at least one measuring range ( 103 ), characterized in that the measuring wire ( 1 ) at the distal end a guide tip ( 11 ), the measuring range ( 103 ) proximal to the guide tip ( 11 ), and that the core wire ( 10 ) in the measuring range ( 103 ) at least two along the length of the core wire ( 10 ) spaced apart positions radiopaque markers ( 100 ) having. Measuring wire according to claim 1, characterized in that the core wire ( 10 ) from the proximal end of the measuring wire ( 1 ) to the proximal end of the guide tip ( 11 ) has a constant diameter. Measuring wire according to one of claims 1 or 2, characterized in that in the measuring range ( 103 ) more than two marks ( 100 ) are provided at predetermined intervals to each other. Measuring wire according to one of claims 1 to 3, characterized in that more than two markings ( 100 ) in the measuring range ( 103 ) and between two adjacent markings ( 100 ) in each case the same distance is present. Measuring wire according to one of claims 1 to 4, characterized in that the measuring range ( 103 ) extending from the proximal end of the guide tip ( 11 ) to the proximal end of the measuring wire ( 1 ). Measuring wire according to claim 1, characterized in that the core wire ( 10 ) of the measuring wire ( 1 ) in the measuring range ( 103 ) is at least partially surface-treated. Measuring wire according to one of claims 1 to 6, characterized in that in the region of the markings ( 100 ) Wells ( 104 ) in the circumference of the core wire ( 10 ) are introduced, which are filled with radiopaque material. Measuring wire according to one of claims 1 to 7, characterized in that the at least one mark ( 100 ) a coating of the core wire ( 10 ), in particular a vapor-deposited, by bath coating or by sputtering coating on the core wire ( 10 ). Measuring wire according to one of claims 1 to 8, characterized in that the core wire ( 10 ) a hollow wire ( 106 ) and the at least one mark ( 100 ) in the lumen of the hollow wire ( 106 ) and a marking element ( 1051 ), preferably made of wire material. Measuring wire according to one of claims 1 to 9, characterized in that in the lumen of the hollow wire ( 106 ) at least five wire elements ( 105 ) are introduced, of which at least two wire elements ( 105 ) Marking elements ( 1051 ) consist of a wire material of radiopaque material. Measuring wire according to claim 10, characterized in that in the lumen of the hollow wire ( 106 ) from the proximal end of the hollow wire ( 106 ), a cored wire ( 1050 ), at least two marking elements ( 1051 ) with at least one intermediate element ( 1052 ) between the marking elements ( 1051 ) is arranged and a tip element ( 1053 ) are arranged. Measuring wire according to one of claims 10 or 11, characterized in that the wire elements ( 105 ), preferably welded together. Measuring wire according to one of claims 1 to 12, characterized in that on the core wire ( 10 ) at least in the measuring range ( 103 ) a protective layer ( 12 ) is applied. Measuring wire according to one of claims 1 to 13, characterized in that the measuring wire ( 1 ) represents a guide wire for at least one medical device. Measuring wire according to one of claims 1 to 14, characterized in that the marking ( 100 ) consists of tungsten, gold, platinum, bismuth, tantalum or an alloy thereof. Measuring wire according to one of claims 1 to 15, characterized in that the guide tip ( 11 ) by a spiral ( 110 ) formed with the core wire ( 10 ) connected is.

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