CA2037056A1 - Tissue sampler - Google Patents
Tissue samplerInfo
- Publication number
- CA2037056A1 CA2037056A1 CA002037056A CA2037056A CA2037056A1 CA 2037056 A1 CA2037056 A1 CA 2037056A1 CA 002037056 A CA002037056 A CA 002037056A CA 2037056 A CA2037056 A CA 2037056A CA 2037056 A1 CA2037056 A1 CA 2037056A1
- Authority
- CA
- Canada
- Prior art keywords
- exterior tube
- tissue
- slide
- needle
- cannula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 229910052729 chemical element Inorganic materials 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 229920000136 polysorbate Polymers 0.000 claims 1
- 238000001574 biopsy Methods 0.000 abstract description 35
- 230000033001 locomotion Effects 0.000 description 13
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 241001631457 Cannula Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Instruments for taking body samples for diagnostic purposes; Other methods or instruments for diagnosis, e.g. for vaccination diagnosis, sex determination or ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B10/0233—Pointed or sharp biopsy instruments
- A61B10/0266—Pointed or sharp biopsy instruments means for severing sample
- A61B10/0275—Pointed or sharp biopsy instruments means for severing sample with sample notch, e.g. on the side of inner stylet
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Instruments for taking body samples for diagnostic purposes; Other methods or instruments for diagnosis, e.g. for vaccination diagnosis, sex determination or ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B2010/0208—Biopsy devices with actuators, e.g. with triggered spring mechanisms
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
A b s t r a c t o f t h e I n v e n t i o n What is described here is a device for taking tissue samples by means of a biopsy cannula comprising a needle element with a cavity in its distal terminal zone and an exterior tube surround the needle element, which cannula is inserted into the tissue to be sampled by means of an inserting unit.
The invention is characterized by the aspects that the inserting unit causes the needle element and the exterior tube to move jointly into a position inside the tissue in which the exterior tube is pushed over the cavity, that the inserting unit retracts the exterior tube behind the cavity in the needle element after termination of the in-serting operation, and subsequently pushes the exterior tube again over the needle element so as to cover the cavity.
The invention is characterized by the aspects that the inserting unit causes the needle element and the exterior tube to move jointly into a position inside the tissue in which the exterior tube is pushed over the cavity, that the inserting unit retracts the exterior tube behind the cavity in the needle element after termination of the in-serting operation, and subsequently pushes the exterior tube again over the needle element so as to cover the cavity.
Description
Tlssue SamDler Background of the Invention The invention relates to a tissue sampler in accordance with the introductory clause oY Patent Claim 1. Such sampling devices are also referred to as biopsy instruments.
Prior Art In known devices according to the introductory clause of Pat-ent Claim 1 ~irst a biopsy cannula provided with a cavity in its dis-tal terminal zone is inserted into the tissue ~rom where a tissue sample or specimen is to be taken. Then an exterior tube is pushed over the blopsy cannula to severe from the tissue a small tissue sample located ln the cavity. Then the biopsy cannula ls removed irom the tissue together with the exterior tube pushed thereover.
What is inexpedient in these known biopsy devices according to the introductory clause according to Patent Claim 1 is the aspect that the diameter oi the biopsy cannula cannot be reduced below a deflned value or else the stability, which required ~or the insertion of the needle into the tissue, were no longer ensured. Thus the exte-rior tube surrounding the biopsy cannula necessarily presents a com-paratively great diameter, too.
Brier Description Or the Invention The present invention is based on the problem oi denning abiopsy instrument, i.e. a device ior taking tissue samples and speci-mens, wherein the diameters of the cannula, i.e. the biopsy needle, and oi the exterior tube pushed over the biopsy needle may be sub-stantially smaller than that of conventional instruments, without running the risk oi the needle element bending when it is inserted 2û3705~
into the tissue from where a sample is to be taken.
One solution to this problem in accordance with the invention ls characterized in Patent Claim 1. Improvements Or the invention constltute the ~ub,lect matters of dependent claims.
lt was a surprise to ~ind that the problem to be solved in ac-cordance with the present invention could be managed when the in-vention moreover starts out from a biopsy instrument according to the introductory clause of Patent Claim 1, i.e. ~rom a device wherein the cannula consists o~ a needle element or a biopsy needle, respec-tively, with a cavity in its distal terminal zone and o~ an exterior tube surrounding the needle element.
According to the present invention, however, the ~nserting unit does not insert the needle element alone into the tissue but jointly with the exterior tube, in a position where the exterior tube is pushed over the cavity. Only after termination o~ the inserting pro-cedure the exterior tube is retracted into a position behind the cavi-ty ln the needle element. Due to thls motion the tissue to be sam-pled advances into the cavity as a result of the "resilient resetting force" which is created by the cannula's displacement of the tissue.
Then the exterior tube is pushed again over the cavity in the needle element, l.e. the biopsy needle. The biopsy cannula is then removed in this position.
Since in the inventive instrument the needle element is insert-ed into the tissue in combination with the exterior tube it is not the needle element alone but rather the needle element in cooperation with the surrounding exterior tube which is of decisive importance for the stability of the blopsy cannula. The needle element as such may thereiore be made substantially thinner than the needle ele-ments common in conventional biopsy instruments. On prlnciple it is even sufficient to have an overall biopsy cannula of the same out-side dlameter as the biopsy needle common ln conventional lnstru-ments in order to achieve during insertion a cannula ~tability which is comparable to the stability which conventional instruments pre-2~37056 sent.
The inserting unit oî the inventi~e device may be so designedthat it carrles out the lndividual successive movements automatically a~ter operatlon of a "trigger element". It is preferable, however, to design the insertlng unit in a way that the operator has an opportu-nity of insèrting into the tissue initially only the needle element and the exterior tube surrounding the biopsy needle whereupon the actual sampling, i.e. the process of taking tissue samples, is trig-gered manually ~Claim 2). The operator thus disposes of the option of correcting the location of tissue removal after insertion of the biopsy cannula whenever such a correction should be required.
According to Claim 3 the inserting unit includes two coaxially displaceable slide elements whereof one, i.e. the slide element rear-ward in the direction of insertion, carries the needle element while the other one, i.e. the slide element forward in the direction of in-sertion, carries a further slide element which is adapted to be dis-placed relative to the ~orward slide element and which supports the exterior tube. Due to this inventive deslgn presenting three sllde el-ements altogether with are displaceable Jointly or relative to each other, it is posslble for the inserting means to carry out the lnven-tlve succession of movements with possibly selectable stroke lengths (Claim 8), in any case, however, in a reproducible manner.
The individual slide elements may be driven in any way con-celvable on principle. A particularly uncomplex structure is achieved, however, by the provlsion oi springs to drive the indlvidual slide el-ements. Claims 4 to 6 define particularly simpie configurations oi such spring drive mechanism which allow not only for a plain "bias-ing" of the inventively designed inserting unit but also for an un-complicated setting of the respective stroke lengths by means of stops (Claim 7).
2~0~6 Claims 8 to 10 characteriz~ biopsy cannulae whose designs are partlcula~ly expedient for the inventive succession of movements.
Wlth the speciflc con~iguration of the distal face o~ the exterior tube the tissue sample ls "severed" by a particularly smooth cut. More-over, the contour of the exterior tube according to the present in-vention enhances the insertion of the exterior tube together with the biopsy needle.
BrieI description OI the drawings Referring to the drawings, the present invention will be de-scribed in the following with reference to the examples given by spe-cific embodiments, without any restriction o~ the general inventive idea; as far as the disclosure of all the details of the invention which are not explained explicitly in ~urther aspects in the text is concerned reference is made to the drawings wherein:
Flgs. la to ld each show a schematic sectional view taken through an lnventive inserting unit in its vari-ous operating positlons, Fig. 2 lllustrates the attachment of a biopsy cannula at an inserting unit in accordance with Fig. 1, Figs. 3a to 3d each show the various positions of the biopsy cannula associated with the positions of the in-serting unit which are illustrated in Figs. la to 1 d, and Figs. 4a and 4b are each an enlarged view of the distal end of the biopsy cannula.
Description Or an Embodiment The inserting unit illustrated in Figures 1 and 2, serves to in-sert biopsy cannulae and includes three slide elements (simply re-ferred to as slides ln the following) 1 to 3 which are supported in a housing 4 Ior displacement along a common axis 5. In order to reduce the illustration to the essentials merely one pin element 6 is shown 2~370~6 as one example of the supporting elements on which the slide 1 is supported ~or displacement along the extension of the axis 5.
Compression springs 7 to 9 are provided to drive the various slides, whereof spring 7 is inserted between the casing 4 and the rear face of the slide 2, while spring 8 is located between a stop 10 at the slide 1 and a bearing surface 2' at the slide 2, whereas spring 9 is clamped between another stop 11 at the slide 1 and the slide 3.
Moreover, pawls 12 to 14 are provided as trigger elements whereof pawl 12 is supported at the casing while the pawls 13 and 14 are provided at the slide 2. The pawls 12 and 14 engage into as-sociated recesses at the slides 2 or 3, respectively, while the pawl 13 bears against the stop 10 of the slide 1.
Pigure 2 illustrates the attachment of a biopsy needle 21 at the slide 2 and of an exterior tube 22 of a biopsy cannula at the slide 3. Figure 2 shows the provision of a positive connection as an example of the interconnection between the elements 21 and 22 of the biopsy cannula, on the one hand. and the slide elements 2 and 3, on the other hand. Other connecting provisions are also conceiv-able, of course, on the single condition that they allow for an un-complicated attachment of the biopsy cannula at the inserting unit.
The following is a more detailed explanation of the operation of the inventive inserting unit with reference to Figures la to ld as well as Figures 3a to 3d which illustrate each the respective posi-tions of the biopsy cannula.
In the initial condition prior to the inition of the inserting procedure, which is illustrated in Figure 1 a, the compression springs 7 to ~ are biased while the slide elements 1 to 3 are each arrested by the associated pawls or triggering elements 12 to 14. The cannula is retracted accordingly, with the exterior tube 22 covering the cavi-ty 23 in the biopsy needle 21 (Fig. 3a).
20370~6 The sampling operatlon is started by actuation Or the pawls or triggering elements 12. This actlon causes the slides 1 to 3 to be jointly displaced by the sprlng 7 along the axis 5. A stop 41 at the casing 4 limits the distance by which the three slides may be dis-placed; whenever this is expedient that stop may be an ad~ustable arrester so that the advance motion for insertion of the biopsy can-nula 21 and 22 may be selected Figure lb illustrates the condition Or the inserting unit arterinsertion of the biopsy cannula. Figure 3b shows the distal end of the biopsy cannula with this con~iguration. According to Figure 3b, as a result o~ the joint movement of the individual cannula elements, the exterior tube 22 remains in a position pushed over the needle 21 so far that the cavity 23 in the needle 22 is covered.
With the elements in this position it is now possible to actuate the trigger element 14 either automatically under control of appropri-ate actuator elements such as a (non-illustrated) cam guide at the casing 4 or manually. This operation initiates the movement of the slide 3 under the action of the spring 9 toward the stop 10.
Flgure lc shows the result of this movement for the insertlng unit. Figure 3c shows the retraction of the exterior tube 22 into a position behind the cavity 23 in the biopsy needle, which is caused by the movement of the slide element 3 relative to the slides 1 and 2.
Then the triggering element 13 is actuated - equally automati-cally, e.g. by means Or an appropriate cam guide, or by hand. This action causes the spring 8 to displace the sllde 1 together with the slide 3 ~ixed to it in a direction toward the stop 41 while the slide 2 remains stationary (Figure ld). As a result oi~ this movement the exterior tube 22 is pushed again over the cavity 23 in the needle 21 (Figure 3d). The advancing movement oi the e~terior tube 22 sepa-rates that part OI the tissue rrom the remaining tissue which has bulged into the cavity 23 due to the elasticity Or the tissue, such that a small tissue sample is retained in the cavity 23, which may 2~37~56 then be removed, e.g. by a suitable rearward movement o~ the insert-ing unit, with the biopsy cannula îollowing as one unit consisting of the needle 21 and the exterior tube 22.
Flgures 4a and 4b show the exterior tube 22 or the needle 21 with the cavity Z3 and the exterior tube 22, respectively, again, even though as an enlarged view. AS may be seen in Flgure 4 the distal face end of the exterior tube 22 presents a first portion 24 which defines an acute angle a relative to the longitudinal axis of the exterior tube and is joined by a second portion 25 defining an obtuse angle relative to the longitudinal axis. The second portion 25 terminates In a pointed projectlon 26 which is located slightly above the center of the lateral contour in the illustrated embodiment. The pointed projection 26 is ioined by a portion 27 which in its turn de-fines an acute angle relative to the longitudinal axis. This specific shape of the distal face end of the exterior tube is expedient in particular with the succession of motions provided according to the present invention as this specific configuration of the face end en-sures a safe and smooth severing of the tissue sample even in cases where the specimen is removed in opposition to the extension oî the flbers, Even though the invention has been described in the foregoing ~ith reîerence t~o a particular embodiment this description does not involve a restriction of the scope of the general inventive idea.
Prior Art In known devices according to the introductory clause of Pat-ent Claim 1 ~irst a biopsy cannula provided with a cavity in its dis-tal terminal zone is inserted into the tissue ~rom where a tissue sample or specimen is to be taken. Then an exterior tube is pushed over the blopsy cannula to severe from the tissue a small tissue sample located ln the cavity. Then the biopsy cannula ls removed irom the tissue together with the exterior tube pushed thereover.
What is inexpedient in these known biopsy devices according to the introductory clause according to Patent Claim 1 is the aspect that the diameter oi the biopsy cannula cannot be reduced below a deflned value or else the stability, which required ~or the insertion of the needle into the tissue, were no longer ensured. Thus the exte-rior tube surrounding the biopsy cannula necessarily presents a com-paratively great diameter, too.
Brier Description Or the Invention The present invention is based on the problem oi denning abiopsy instrument, i.e. a device ior taking tissue samples and speci-mens, wherein the diameters of the cannula, i.e. the biopsy needle, and oi the exterior tube pushed over the biopsy needle may be sub-stantially smaller than that of conventional instruments, without running the risk oi the needle element bending when it is inserted 2û3705~
into the tissue from where a sample is to be taken.
One solution to this problem in accordance with the invention ls characterized in Patent Claim 1. Improvements Or the invention constltute the ~ub,lect matters of dependent claims.
lt was a surprise to ~ind that the problem to be solved in ac-cordance with the present invention could be managed when the in-vention moreover starts out from a biopsy instrument according to the introductory clause of Patent Claim 1, i.e. ~rom a device wherein the cannula consists o~ a needle element or a biopsy needle, respec-tively, with a cavity in its distal terminal zone and o~ an exterior tube surrounding the needle element.
According to the present invention, however, the ~nserting unit does not insert the needle element alone into the tissue but jointly with the exterior tube, in a position where the exterior tube is pushed over the cavity. Only after termination o~ the inserting pro-cedure the exterior tube is retracted into a position behind the cavi-ty ln the needle element. Due to thls motion the tissue to be sam-pled advances into the cavity as a result of the "resilient resetting force" which is created by the cannula's displacement of the tissue.
Then the exterior tube is pushed again over the cavity in the needle element, l.e. the biopsy needle. The biopsy cannula is then removed in this position.
Since in the inventive instrument the needle element is insert-ed into the tissue in combination with the exterior tube it is not the needle element alone but rather the needle element in cooperation with the surrounding exterior tube which is of decisive importance for the stability of the blopsy cannula. The needle element as such may thereiore be made substantially thinner than the needle ele-ments common in conventional biopsy instruments. On prlnciple it is even sufficient to have an overall biopsy cannula of the same out-side dlameter as the biopsy needle common ln conventional lnstru-ments in order to achieve during insertion a cannula ~tability which is comparable to the stability which conventional instruments pre-2~37056 sent.
The inserting unit oî the inventi~e device may be so designedthat it carrles out the lndividual successive movements automatically a~ter operatlon of a "trigger element". It is preferable, however, to design the insertlng unit in a way that the operator has an opportu-nity of insèrting into the tissue initially only the needle element and the exterior tube surrounding the biopsy needle whereupon the actual sampling, i.e. the process of taking tissue samples, is trig-gered manually ~Claim 2). The operator thus disposes of the option of correcting the location of tissue removal after insertion of the biopsy cannula whenever such a correction should be required.
According to Claim 3 the inserting unit includes two coaxially displaceable slide elements whereof one, i.e. the slide element rear-ward in the direction of insertion, carries the needle element while the other one, i.e. the slide element forward in the direction of in-sertion, carries a further slide element which is adapted to be dis-placed relative to the ~orward slide element and which supports the exterior tube. Due to this inventive deslgn presenting three sllde el-ements altogether with are displaceable Jointly or relative to each other, it is posslble for the inserting means to carry out the lnven-tlve succession of movements with possibly selectable stroke lengths (Claim 8), in any case, however, in a reproducible manner.
The individual slide elements may be driven in any way con-celvable on principle. A particularly uncomplex structure is achieved, however, by the provlsion oi springs to drive the indlvidual slide el-ements. Claims 4 to 6 define particularly simpie configurations oi such spring drive mechanism which allow not only for a plain "bias-ing" of the inventively designed inserting unit but also for an un-complicated setting of the respective stroke lengths by means of stops (Claim 7).
2~0~6 Claims 8 to 10 characteriz~ biopsy cannulae whose designs are partlcula~ly expedient for the inventive succession of movements.
Wlth the speciflc con~iguration of the distal face o~ the exterior tube the tissue sample ls "severed" by a particularly smooth cut. More-over, the contour of the exterior tube according to the present in-vention enhances the insertion of the exterior tube together with the biopsy needle.
BrieI description OI the drawings Referring to the drawings, the present invention will be de-scribed in the following with reference to the examples given by spe-cific embodiments, without any restriction o~ the general inventive idea; as far as the disclosure of all the details of the invention which are not explained explicitly in ~urther aspects in the text is concerned reference is made to the drawings wherein:
Flgs. la to ld each show a schematic sectional view taken through an lnventive inserting unit in its vari-ous operating positlons, Fig. 2 lllustrates the attachment of a biopsy cannula at an inserting unit in accordance with Fig. 1, Figs. 3a to 3d each show the various positions of the biopsy cannula associated with the positions of the in-serting unit which are illustrated in Figs. la to 1 d, and Figs. 4a and 4b are each an enlarged view of the distal end of the biopsy cannula.
Description Or an Embodiment The inserting unit illustrated in Figures 1 and 2, serves to in-sert biopsy cannulae and includes three slide elements (simply re-ferred to as slides ln the following) 1 to 3 which are supported in a housing 4 Ior displacement along a common axis 5. In order to reduce the illustration to the essentials merely one pin element 6 is shown 2~370~6 as one example of the supporting elements on which the slide 1 is supported ~or displacement along the extension of the axis 5.
Compression springs 7 to 9 are provided to drive the various slides, whereof spring 7 is inserted between the casing 4 and the rear face of the slide 2, while spring 8 is located between a stop 10 at the slide 1 and a bearing surface 2' at the slide 2, whereas spring 9 is clamped between another stop 11 at the slide 1 and the slide 3.
Moreover, pawls 12 to 14 are provided as trigger elements whereof pawl 12 is supported at the casing while the pawls 13 and 14 are provided at the slide 2. The pawls 12 and 14 engage into as-sociated recesses at the slides 2 or 3, respectively, while the pawl 13 bears against the stop 10 of the slide 1.
Pigure 2 illustrates the attachment of a biopsy needle 21 at the slide 2 and of an exterior tube 22 of a biopsy cannula at the slide 3. Figure 2 shows the provision of a positive connection as an example of the interconnection between the elements 21 and 22 of the biopsy cannula, on the one hand. and the slide elements 2 and 3, on the other hand. Other connecting provisions are also conceiv-able, of course, on the single condition that they allow for an un-complicated attachment of the biopsy cannula at the inserting unit.
The following is a more detailed explanation of the operation of the inventive inserting unit with reference to Figures la to ld as well as Figures 3a to 3d which illustrate each the respective posi-tions of the biopsy cannula.
In the initial condition prior to the inition of the inserting procedure, which is illustrated in Figure 1 a, the compression springs 7 to ~ are biased while the slide elements 1 to 3 are each arrested by the associated pawls or triggering elements 12 to 14. The cannula is retracted accordingly, with the exterior tube 22 covering the cavi-ty 23 in the biopsy needle 21 (Fig. 3a).
20370~6 The sampling operatlon is started by actuation Or the pawls or triggering elements 12. This actlon causes the slides 1 to 3 to be jointly displaced by the sprlng 7 along the axis 5. A stop 41 at the casing 4 limits the distance by which the three slides may be dis-placed; whenever this is expedient that stop may be an ad~ustable arrester so that the advance motion for insertion of the biopsy can-nula 21 and 22 may be selected Figure lb illustrates the condition Or the inserting unit arterinsertion of the biopsy cannula. Figure 3b shows the distal end of the biopsy cannula with this con~iguration. According to Figure 3b, as a result o~ the joint movement of the individual cannula elements, the exterior tube 22 remains in a position pushed over the needle 21 so far that the cavity 23 in the needle 22 is covered.
With the elements in this position it is now possible to actuate the trigger element 14 either automatically under control of appropri-ate actuator elements such as a (non-illustrated) cam guide at the casing 4 or manually. This operation initiates the movement of the slide 3 under the action of the spring 9 toward the stop 10.
Flgure lc shows the result of this movement for the insertlng unit. Figure 3c shows the retraction of the exterior tube 22 into a position behind the cavity 23 in the biopsy needle, which is caused by the movement of the slide element 3 relative to the slides 1 and 2.
Then the triggering element 13 is actuated - equally automati-cally, e.g. by means Or an appropriate cam guide, or by hand. This action causes the spring 8 to displace the sllde 1 together with the slide 3 ~ixed to it in a direction toward the stop 41 while the slide 2 remains stationary (Figure ld). As a result oi~ this movement the exterior tube 22 is pushed again over the cavity 23 in the needle 21 (Figure 3d). The advancing movement oi the e~terior tube 22 sepa-rates that part OI the tissue rrom the remaining tissue which has bulged into the cavity 23 due to the elasticity Or the tissue, such that a small tissue sample is retained in the cavity 23, which may 2~37~56 then be removed, e.g. by a suitable rearward movement o~ the insert-ing unit, with the biopsy cannula îollowing as one unit consisting of the needle 21 and the exterior tube 22.
Flgures 4a and 4b show the exterior tube 22 or the needle 21 with the cavity Z3 and the exterior tube 22, respectively, again, even though as an enlarged view. AS may be seen in Flgure 4 the distal face end of the exterior tube 22 presents a first portion 24 which defines an acute angle a relative to the longitudinal axis of the exterior tube and is joined by a second portion 25 defining an obtuse angle relative to the longitudinal axis. The second portion 25 terminates In a pointed projectlon 26 which is located slightly above the center of the lateral contour in the illustrated embodiment. The pointed projection 26 is ioined by a portion 27 which in its turn de-fines an acute angle relative to the longitudinal axis. This specific shape of the distal face end of the exterior tube is expedient in particular with the succession of motions provided according to the present invention as this specific configuration of the face end en-sures a safe and smooth severing of the tissue sample even in cases where the specimen is removed in opposition to the extension oî the flbers, Even though the invention has been described in the foregoing ~ith reîerence t~o a particular embodiment this description does not involve a restriction of the scope of the general inventive idea.
Claims (10)
1. Tissue sampler for removal of tissue samples by means of a bi-opsy cannula which comprises a needle element (21) with a cavity (23) in the distal terminal zone and an exterior tube (22) surround-ing said needle element, and which is inserted into the tissue from which samples are to be taken by means of an inserting unit, characterized in that said inserting unit causes said needle element (21) and said exterior tube (22) to move jointly into a position in-side the tissue in which said exterior tube is pushed over said cavi-ty (23), that said inserting unit retracts said exterior tube behind said cavity in said needle element after termination of the inserting operation, and subsequently pushes said exterior tube again over said needle element so as to cover said cavity.
2. Tissue sampler according to Claim 1, characterized in that said inserting unit initially introduces only said needle element and said exterior tube into the tissue, and that the displacement of said exterior tube relative to said needle element may be manually triggered.
3. Tissue sampler according to Claim 1 or 2, characterized in that said inserting unit comprises two coaxially dis-placeable slide elements (1, 2) whereof the slide element (2) which is located rearward in the inserting direction carries said needle ele-ment (21) while the slide element (1) located forward in the inserting direction carries a further slide element (3) which is adapted to be displaced relative to said forward slide element and which carries said exterior tube (22).
4. Tissue sampler according to Claim 3, characterized in that a first spring (7) acts upon the two coaxially displaceable slide elements (1, 2) in the inserting direction, and that said two slide elements are adapted to be arrested by a releasable locking element (12) in the position in which the spring is biased.
5. Tissue sampler according to Claim 4, characterized in that said slide element (1) which is located forward in the inserting direction comprises a stop 81) for said further slide element (3), with said further slide element being adapted to be moved toward said stop under the action of a second spring (9) fol-lowing the release of a locking element ( 14) .
6. Tissue sampler according to Claim 5.
characterized in that a third spring (8) is provided and biased be-tween said two coaxially displaceable slide elements ( 1, 2), which spring causes said forward slide element (1) together with said fur-ther slide element (3) to advance in the cannula-inserting direction after release of a locking element (13) in a manner that said further slide element is advanced to the position where it was located prior to the expansion of said second spring (9).
characterized in that a third spring (8) is provided and biased be-tween said two coaxially displaceable slide elements ( 1, 2), which spring causes said forward slide element (1) together with said fur-ther slide element (3) to advance in the cannula-inserting direction after release of a locking element (13) in a manner that said further slide element is advanced to the position where it was located prior to the expansion of said second spring (9).
7. Tissue sampler according to any of Claims 3 to 6, characterized in that said slide elements are displaced toward adjust-able stops (10, 41).
8. Cannula specifically for application with a sampler according to any of Claims 1 to 7, characterized in that the distal race end of said exterior tube (22) includes a first portion (24) defining an acute angle (a) relative to the longitudinal axis of said exterior tube, which is joined by a sec-ond portion (25) defining an obtuse angle relative to the longitudinal axis of said exterior tube.
9. Cannula according to Claim 8, characterized in that said second portion (25) terminates in at least one pointed projection (26).
10. Cannula according to Claim 9, characterized in that said pointed projection (26) is located in the center of the lateral contour or above the center of the lateral con-tour of said exterior tube (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3924291A DE3924291C2 (en) | 1989-07-22 | 1989-07-22 | Biopsy channels for taking tissue samples |
| DEP3924291.9 | 1989-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2037056A1 true CA2037056A1 (en) | 1991-01-23 |
Family
ID=6385612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002037056A Abandoned CA2037056A1 (en) | 1989-07-22 | 1990-07-20 | Tissue sampler |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0435986B1 (en) |
| JP (1) | JPH04502872A (en) |
| AT (1) | ATE146060T1 (en) |
| CA (1) | CA2037056A1 (en) |
| DE (2) | DE3924291C2 (en) |
| ES (1) | ES2098269T3 (en) |
| WO (1) | WO1991001112A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662082B2 (en) | 2004-11-05 | 2010-02-16 | Theragenics Corporation | Expandable brachytherapy device |
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| CN109106406B (en) | 2013-11-05 | 2021-06-29 | C·R·巴德公司 | Biopsy device with integrated vacuum |
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| US4881551A (en) * | 1988-02-01 | 1989-11-21 | Hart Enterprises, Inc. | Soft tissue core biopsy instrument |
-
1989
- 1989-07-22 DE DE3924291A patent/DE3924291C2/en not_active Expired - Lifetime
-
1990
- 1990-07-20 DE DE59010602T patent/DE59010602D1/en not_active Expired - Lifetime
- 1990-07-20 AT AT90910546T patent/ATE146060T1/en not_active IP Right Cessation
- 1990-07-20 JP JP2510245A patent/JPH04502872A/en active Pending
- 1990-07-20 WO PCT/DE1990/000549 patent/WO1991001112A2/en active IP Right Grant
- 1990-07-20 EP EP90910546A patent/EP0435986B1/en not_active Expired - Lifetime
- 1990-07-20 CA CA002037056A patent/CA2037056A1/en not_active Abandoned
- 1990-07-20 ES ES90910546T patent/ES2098269T3/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662082B2 (en) | 2004-11-05 | 2010-02-16 | Theragenics Corporation | Expandable brachytherapy device |
| US8398534B2 (en) | 2004-11-05 | 2013-03-19 | Theragenics Corporation | Expandable brachytherapy device |
| US8562504B2 (en) | 2004-11-05 | 2013-10-22 | Theragenics Corporation | Expandable brachytherapy device |
| US8568284B2 (en) | 2004-11-05 | 2013-10-29 | Theragenics Corporation | Expandable brachytherapy device |
| US8684899B2 (en) | 2004-11-05 | 2014-04-01 | Theragenics Corporation | Expandable brachytherapy device |
| US8690746B2 (en) | 2004-11-05 | 2014-04-08 | Theragenics Corporation | Expandable brachytherapy device |
| US9623260B2 (en) | 2004-11-05 | 2017-04-18 | Theragenics Corporation | Expandable brachytherapy device |
| US9808650B2 (en) | 2004-11-05 | 2017-11-07 | Theragenics Corporation | Expandable brachytherapy device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991001112A2 (en) | 1991-02-07 |
| ATE146060T1 (en) | 1996-12-15 |
| JPH04502872A (en) | 1992-05-28 |
| DE3924291C2 (en) | 2000-07-13 |
| HK1007482A1 (en) | 1999-04-16 |
| DE59010602D1 (en) | 1997-01-23 |
| WO1991001112A3 (en) | 1991-03-07 |
| EP0435986B1 (en) | 1996-12-11 |
| DE3924291A1 (en) | 1991-01-31 |
| EP0435986A1 (en) | 1991-07-10 |
| ES2098269T3 (en) | 1997-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |